Service Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
April 2012
Outdoor unit
SERVICE MANUAL
No.OCH512
R410A
[Model names]
[Service Ref.]
PUZ-A42NHA5
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
Note:
• This manual describes
only service data of the
outdoor units.
• RoHS compliant products
have <G> mark on the
spec name plate.
PUY-A42NHA5
PUY-A42NHA5-BS
CONTENTS
1. REFERENCE MANUAL ································· 2
2. SAFETY PRECAUTION ································· 2
3. FEATURES ····················································· 6
4. SPECIFICATIONS ·········································· 7
5. DATA······························································· 8
6. OUTLINES AND DIMENSIONS ··················· 11
7. WIRING DIAGRAM ······································ 12
8. WIRING SPECIFICATIONS·························· 13
9. REFRIGERANT SYSTEM DIAGRAM ············· 18
10. TROUBLESHOOTING ·································· 20
11. EASY MAINTENANCE FUNCTION·············· 72
12. FUNCTION SETTING ··································· 75
13. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER·····83
14. DISASSEMBLY PROCEDURE ····················· 93
PUZ-A42NHA5
PUY-A42NHA5
PARTS CATALOG (OCB512)
1
REFERENCE MANUAL
INDOOR UNIT
Model name
Service Ref.
PLA-A42BA4
PLA-A42BA4
OCH482
OCB482
PCA-A42KA5
PCA-A42KA5.TH
OCH501
OCB501
PEAD-A42AA4
PEAD-A42AA4
2
Service manual No.
HWE0905A
SAFETY PRECAUTION
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
Preparation before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off the power-supply beaker.
• Discharge the condenser before the work involving the electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be done without turning off the power,
exercise great caution not to touch the live parts.
OCH512
2
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Use a vacuum pump with a reverse flow check
valve.
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the followings.
· Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
Contamination inside refrigerant piping can cause deterioration of refrigerant oil etc.
Store the piping to be used indoors during
installation, and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Tools for R410A
Flare tool
Size adjustment gauge
Vacuum pump adaptor
Electronic refrigerant
charging scale
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
Do not use a charging cylinder.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
If large amount of mineral oil enters, that can cause deterioration of refrigerant oil etc.
Use the specified refrigerant only.
Charge refrigerant from liquid phase of gas
cylinder.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.
OCH512
3
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Unit
Gravimeter
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No.
1
Tool name
Gauge manifold
Specifications
· Only for R410A
· Use the existing fitting specifications.
· Use high-tension side pressure of 5.3MPa·G or over.
2
Charge hose
· Only for R410A
· Use pressure performance of 5.09MPa·G or over.
3
Electronic scale
4
Gas leak detector
· Use the detector for R134a, R407C or R410A
5
Adaptor for reverse flow check
· Attach on vacuum pump.
6
Refrigerant charge base
7
Refrigerant cylinder
—
—
· Only for R410A
·Top of cylinder (Pink)
· Cylinder with syphon
8
—
Refrigerant recovery equipment
OCH512
4
2-3. CAUTIONS FOR REFRIGERANT PIPING WORK
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is
same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the
working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
1 Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7 mm [7/256 inch] or below.)
Diagram below: Piping diameter and thickness
Thickness : mm [inch]
Nominal
Outside
dimensions[inch] diameter (mm)
R410A
R22
0.8 [1/32]
0.8 [1/32]
6.35
1/4
0.8 [1/32]
0.8 [1/32]
9.52
3/8
0.8 [1/32]
0.8 [1/32]
12.70
1/2
1.0 [5/128]
1.0 [5/128]
15.88
5/8
—
1.0 [5/128]
19.05
3/4
2 Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because of its working pressure is higher than that of other
refrigerants. Therefore, to enhance air tightness and intensity, flare cutting dimension of copper pipe for R410A has
been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for
R410A also has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
Dimension A
Dimension B
Flare cutting dimensions
Nominal
Outside
dimensions[inch]
diameter
6.35
1/4
9.52
3/8
12.70
1/2
15.88
5/8
19.05
3/4
9.1
13.2
16.6
19.7
Unit : mm [inch]
Dimension A ( +0
-0.4 )
R410A
R22
[11/32-23/64]
9.0
[1/2-33/64]
13.0
[41/64-21/32]
16.2
[49/64-25/32]
19.4
—
23.3
Flare nut dimensions
Nominal
Outside
dimensions[inch]
diameter
6.35
1/4
9.52
3/8
12.70
1/2
15.88
5/8
19.05
3/4
Unit : mm [inch]
Dimension B
R410A
R22
17.0
17.0 [43/64]
22.0
22.0 [7/8]
24.0
26.0 [1-3/64]
27.0
29.0 [1-9/64]
—
36.0
3 Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
R410A tools
Can R22 tools be used?
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and
alkylbenzene oil(minimum amount)
Safety charger
Prevent compressor malfunction Tool exclusive for R410A
when charging refrigerant by
spraying liquid refrigerant
Charge valve
Prevent gas from blowing out Tool exclusive for R410A
when detaching charge hose
Tools for other refrigerants can
Vacuum pump
(Usable if equipped
Vacuum drying and air
with adopter for reverbe used if equipped with adoppurge
se flow)
ter for reverse flow check
Flare tool
Tools for other refrigerants
(Usable by adjusting
Flaring work of piping
can be used by adjusting
flaring dimension)
flaring dimension
Tools can be used for other refrigerants
Bend the pipes
Bender
Pipe cutter
Cut the pipes
Tools can be used for other refrigerants
Welder and nitrogen gas cylinder Weld the pipes
Tools can be used for other refrigerants
Refrigerant charging scale Refrigerant charge
Tools can be used for other refrigerants
Vacuum gauge or thermis- Check the degree of vacuum. (Vacuum Tools can be used for other
valve prevents back flow of oil and refri- refrigerants
tor vacuum gauge and
gerant to thermistor vacuum gauge)
vacuum valve
Charging cylinder
Refrigerant charge
Tool exclusive for R410A
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
OCH512
Use
Air purge, refrigerant charge
and operation check
Gas leak check
Collection of refrigerant
Refrigerant charge
Apply to flared section
5
3
FEATURES
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
CHARGELESS SYSTEM
PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.
(Max. 100ft, 30m)
The refrigerant circuit with LEV (Linear Expansion Valve) and accumulator always control the optimal refrigerant level
regardless of the length (100ft, 30m max. and 16ft, 5m min.) of piping. The additional refrigerant charging work during
installation often causes problems.
It is completely eliminated by chargeless system. This unique system improves the quality and reliability of the work done.
It also helps to speed up the installation time.
OCH512
6
4
SPECIFICATIONS
Service Ref.
PUZ-A42NHA5
PUZ-A42NHA5-BS
Power supply Phase
Cycle
Voltage
MCA
MOCP
Breaker size
External finish
Heat exchanger
Defrost method
Crankcase heater
Compressor
Model
Motor output
R.L.A.
L.R.A.
Starter type
Fan
Fan(drive) % No.
Fan motor output
Fan motor
Airflow
Sound level
Cooling
Heating
Protection devices
Dimension
W
D
H
W
D
H
Weight
Single
60Hz
208/230V
26
40
30
Munsell 3Y 7.8/1.1
Plate fin coil
Reverse cycle
Hermetic
ANB33FCTMT
2.5
20
27.5
Inverter
Propeller fan % 2
0.086 + 0.086
0.40 + 0.40
100
3530
51
A
A
A
kW
kW
kW
F.L.A.
m3/min
CFM
dB
dB
–
55
HP switch
Comp. shell thermo
mm
mm
mm
in.
in.
in.
kg
lbs
950
330+30
1350
37-12/32
13 + 1-3/16
53-5/32
114
251
112
247
R410A
4.5
10
Linear expansion valve
Ether (FV50S)
1.4
45
9.52
3/8
15.88
5/8
Flared
Flared
Max. 30
Max. 100
Max. 50
Max. 165
Refrigerant
Charged
kg
lbs
Control
Oil
Charged
Refrigerant
piping
Model
L
oz
Pipe size OD
mm
Liquid
in.
Pipe size OD
mm
Gas
in.
Connection method Indoor
Connection method Outdoor
Height difference
m
IU - OU
ft
Piping length
m
ft
OCH512
PUY-A42NHA5
PUY-A42NHA5-BS
7
DATA
5
5-1. REFILLING REFRIGERANT CHARGE (R410A : oz, kg)
Service Ref.
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
Piping Length (one way)
100ft
110ft
120ft
30m
33m
37m
50ft
15m
60ft
18m
70ft
21m
80ft
24m
90ft
27m
132 oz
136 oz
142 oz
148 oz
154 oz
160 oz
166 oz
3.7 kg
3.9 kg
4.0 kg
4.2 kg
4.4 kg
4.5 kg
4.7 kg
Factory
Charged
130ft
40m
140ft
43m
150ft
46m
160ft
49m
165ft
50m
172 oz
178 oz
184 oz
190 oz
196 oz
202 oz
160 oz
4.9 kg
5.0 kg
5.2 kg
5.4 kg
5.6 kg
5.7 kg
4.5 kg
Longer pipe than 70 or 100 ft, additional charge is required.
5-2. COMPRESSOR TECHNICAL DATA
(at 20°C, 68°F )
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
Service Ref.
Compressor model
Winding Registance
()
ANB33FCTMT
U-V
0.302
U-W
0.302
W-V
0.302
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
MODE SPL(dB)
COOLING
51
HEATING
55
LINE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
90
80
70
NC-70
60
NC-60
MICROPHONE
3.3ft
50
NC-50
UNIT
40
NC-40
5ft
30
NC-30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
NC-20
GROUND
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
OCH512
8
5-3. STANDARD OPERATION DATA
5-3-1. Heat pump
Representative matching
PLA-A42BA4
Mode
Total
Capacity
Input
COOLING
HEATING
BTU/h
42,000
45,000
W
4,600
4,450
Electrical circuit
Indoor unit model
PLA-A42BA4
Phase
Single
Cycle
60Hz
Voltage
230V
Current
1.00A
Outdoor unit model
PUZ-A42NHA5
Phase
Single
Cycle
60Hz
Voltage
230V
Refrigerant circuit
Current
Indoor
side
0.94A
20.4A
21.5A
Discharge pressure
MPa
2.83
2.93
Suction pressure
MPa
0.82
0.69
Discharge temperature
73.4
80.3
Condensing temperature
47.5
47.5
Suction temperature
4.9
0.3
Ref. Pipe length
m
7.6
7.6
Discharge pressure
PSIG
410
425
Suction pressure
PSIG
120
100
Discharge temperature
°F
164
177
Condensing temperature
°F
118
118
Suction temperature
°F
40
33
Ref. Pipe length
ft
25
25
Intake air temperature DB
26.7
21.1
Intake air temperature WB
19.4
15.6
Discharge air temperature DB
41.9
12.9
Outdoor Intake air temperature DB
side
Intake air temperature WB
35
8.3
23.9
6.1
Intake air temperature DB
°F
80
70
Intake air temperature WB
°F
67
60
Discharge air temperature DB
°F
55
107
°F
95
47
°F
75
43
SHF
0.71
–
BF
0.15
–
Indoor
side
Outdoor Intake air temperature DB
side
Intake air temperature WB
OCH512
9
5-3-2. Cooling only
Representative matching
PLA-A42BA4
Mode
Total
COOLING
Capacity
Input
BTU/h
42,000
W
4,600
Indoor unit model
PLA-A42BA4
Electrical circuit
Phase
Single
Cycle
60Hz
Voltage
230V
Current
1.00A
Outdoor unit model
PUY-A42NHA5
Phase
Single
Cycle
60Hz
Voltage
230V
Refrigerant circuit
Current
Indoor
side
20.4A
Discharge pressure
MPa
2.83
Suction pressure
MPa
0.82
Discharge temperature
73.4
Condensing temperature
47.5
Suction temperature
4.9
Ref. Pipe length
m
7.6
Discharge pressure
PSIG
410
Suction pressure
PSIG
120
Discharge temperature
°F
164
Condensing temperature
°F
118
Suction temperature
°F
40
Ref. Pipe length
ft
25
Intake air temperature DB
26.7
Intake air temperature WB
19.4
Discharge air temperature DB
12.9
Outdoor Intake air temperature DB
side
Intake air temperature WB
35
23.9
Intake air temperature DB
°F
80
Intake air temperature WB
°F
67
Discharge air temperature DB
°F
55
°F
95
Indoor
side
Outdoor Intake air temperature DB
side
Intake air temperature WB
°F
75
SHF
0.71
BF
0.15
OCH512
10
Min. 150mm
<5-29/32>
Min. 10mm
<3/8>
Service space
Min.
10mm<3/8>
Min.
500mm
<19-11/16>
:92
8>
<3-5/
92<3-5/8>
65<2-9/16>
Front piping hole
(Knockout)
45<1-25/32>
55<2-3/16>
63
27<1-1/16>
Front trunking hole 40<1-9/16>
(Knockout)
Conduit hole
(2-:27<1-1/16>Knockout)
Piping Knockout Hole Details
<2-1/2>
73<2-7/8>
23<29/32>
Handle
19<3/4>
:92
92<3-5/8>
55<2-3/16>
>
<3-5/8
45<1-25/32>
92<3-5/8>
65<2-9/16>
40<1-9/16>
74<2-19/32>
Rear piping hole
(Knockout)
:
<3-592
/8>
Handle
1/2 Conduit attachment
When installing the conduit.
Set the attachment to the
inner side of each panel.
Handle
Handle
Side Air Intake
Rear Air Intake
Side Air Intake
Piping and wiring connections
can be made from 4 directions:
front, right, rear and below.
Conduit hole
(2-:27<1-1/16>Knockout) 2-:22.2<7/8>
Rear trunking hole
(Knockout)
40<1-9/16>
Right trunking hole
(Knockout)
FOUNDATION
<Foundation bolt height>
Please secure the unit firmly
with 4 foundation (M10<W3/8>)
bolts. (Bolts and washers must
be purchased locally.)
Conduit hole
(2-:27<1-1/16>Knockout)
75
<2-31/32> 40<1-9/16>
Right piping hole
(Knockout)
Air intake
*1 ····Indication of STOP VALVE connection location.
····Refrigerant GAS pipe connection (FLARE):15.88<5/8>
····Refrigerant LIQUID pipe connection (FLARE): 9.52<3/8>
Example of Notes
Min. 1000mm
<39-3/8>
Min. 10mm
<3/8>
FREE
27<1-1/16>
92<3-5/8>
63<2-1/2>
73<2-7/8>
30<1-3/16>
66<2-5/8>
42<1-21/32>
175<6-7/8>
2-U Shaped notched hole
(Foundation Bolt M10<W3/8>)
950<37-13/32>
220
145 145
145
<8-21/32> <5-23/32> <5-23/32> <5-23/32>
Drain hole
5-:33<1-5/16>
71<2-13/16>
2
1
Handle
Service panel
Terminal Block
Left···Power supply wiring
Right····Indoor/Outdoor wiring
2-12%36 Oval hole
(Foundation Bolt M10<W3/8>)
600<23-5/8>
322<12-11/16>Earth terminal
Air Discharge
175<6-7/8>
Rear Air Intake
Front piping cover
Bottom piping hole
(Knockout)
Rear piping cover
PUZ-A42NHA5-BS
PUY-A42NHA5-BS
23<29/32>
Min.
30mm
<1-3/16>
Min.
150mm
<5-29/32>
3 FOUNDATION BOLTS 4 PIPING-WIRING DIRECTIONS
55<2-3/16>
27<1-1/16>
1350<53-5/32>
330<13>
30<1-3/16>
23<29/32>
Dimensions of space needed
for service access are
shown in the below diagram.
* 1 443<17-7/16>
The diagram below shows a
basic example.
Explanation of particular details are
given in the installation manuals etc.
31<1-7/32>
Min.
500mm
<19-11/16>
73<2-7/8>
63<2-1/2>
23<29/32>
635<25>
371<14-19/32>
28<1-3/32>
1 FREE SPACE (Around the unit) 2 SERVICE SPACE
71<2-13/16>
11
81<3-3/16> 219<8-5/8>
19<3/4>
45<1-25/32>
56<2-7/32>
370<14-9/16>
417<16-13/32>
53<2-3/32>
OCH512
1076<42-3/8>
PUZ-A42NHA5
PUY-A42NHA5
* 1 447<17-19/32>
6
OUTLINES AND DIMENSIONS
Unit: mm<inch>
WIRING DIAGRAM
7
PUZ-A42NHA5
[LEGEND]
SYMBOL
TB1
MC
MF1,MF2
21S4
63H
TH3
TH6
TH7
TH8
TH32
LEV-A
DCL
CY1, CY2
ACTM
CB
P.B.
TABU/V/W
PUZ-A42NHA5-BS
PUY-A42NHA5
NAME
SYMBOL
Terminal Block<Power Supply, Indoor/Outdoor >
TABS/T
Motor for Compressor
TABP1/P2/P
Fan Motor
TABN1/N2/N
DS2, DS3
Solenoid Valve (Four-Way Valve)
IPM
High Pressure Switch
N.F.
Thermistor<Outdoor Pipe>
Thermistor<Outdoor 2-Phase Pipe>
LI/LO
Thermistor<Outdoor>
NI/NO
Thermistor<Heatsink>
EI, E2
Thermistor<Shell>
52C
Electronic Expansion Valve
C.B.
Reactor
F1~F4
Capacitor
SW1
Active Filter Module
SW4
Main Smoothing Capacitor
SW5
Power Circuit Board
SW6
Connection Terminal<U/V/W-Phase>
PUY-A42NHA5-BS
NAME
Connection Terminal<L1/L2-Phase>
Connection Terminal<DC Voltage>
Connection Terminal<DC Voltage>
Diode Bridge
Power Module
Noise Filter Circuit Board
Connection Lead<L1-Phase>
Connection Lead<L2-Phase>
Connection Terminal<Ground>
52C Relay
Controller Circuit Board
Fuse<T6.3AL250V>
Switch<Forced Defrost, Defect History Record
Reset, Refrigerant Address>
Switch<Test Operation>
Switch<Function Switch>
Switch<Model Select>
SYMBOL
SW7
SW8
SW9
SWP
CN31
LED1,LED2
SS
CNM
CNMNT
CNVMNT
CNDM
CN3S
CN51
X51,X52
NAME
Switch<Function Setup>
Switch<Function Setup>
Switch
Switch<Pump Down>
Connector<Emergency Operation>
LED<Operation Inspection Indicators>
Connector<Connection for Option>
Connector<A-Control Service Inspection Kit>
Connector<Connected to Optional M-NET Adapter Board>
Connector<Connected to Optional M-NET Adapter Board>
Connector< Connected for Option (Contact Input)>
Connector< Connected for Option>
Connector< Connected for Option (Signal output)>
Relay
When M-NET adapter is connected
63H
LEV-A
3
1
1
CNDC
(PNK)
14
CNM
(WHT)
SW6
2
2
3
1
F3
CNAC
(WHT)
1
2
F1
3
X52
F2
3
F4
4
X51
7
CNS
(WHT)
1 21S4
(GRN)
3
2
1
CN31
CN52C
(RED)
12
CN4
(WHT)
12
CN2
1 (WHT) 7
TRANS
5
1 3 1
CNVMNT CNMNT
(WHT) (WHT)
6
LED5 CN2M
(WHT)
LED1
1 3
63H
(YLW)
3
LEV-A
(WHT)
SW1
1
CNF2
7 (WHT)
2
LED2
SW12
LED3
LED4
M-NET ADAPTER
+1
CND
(WHT)
3 1
3
CN51 CNDM CN3S
(WHT) (WHT) (WHT)
1
5 1 3 1 3
21 1
4 12
TH32 TH7/6 TH3
(BLK) (RED) (WHT)
SW11
SW1
1
t°
SW4SWPSW8 SW5
1
t°
LED1
MF2
MS
3~
t°
+1
CNF1
7 (WHT)
LED2
1
5
5
SW9 SW7
t°
MF1
MS
3~
CN5
(WHT)
5
M
TH32 TH7TH6 TH3
C. B.
A B S
TB7
M-NET
1 SS
(WHT)
21S4
BLU
WHT
+2 PUZ only
1
CN52C
(BLK)
1
CNAF
(WHT)
BLK
2
BLK
P
N1
N2
6
L1
YLW
L2 GR S1
BRN
1
ORN
L2
GRN
WHT
L1
BLU
4
BLK
RED
CN5
(RED)
CNAC1
(WHT)
LI
DCL
OCH512
1
V
W
M
3~
MC
M-NET ADAPTER
NAME
Terminal Block<M-net connection>
Connector<Transmission>
Connector<Power Supply>
Connector<M-NET communication>
Switch<Status of communication>
Switch<Address setting : 1st digit>
Switch<Address setting : 2nd digit>
LED<Power Supply : DC5V>
LED<Connection to Outdoor Unit>
LED<Transmission : Sending>
LED<Transmission : Receiving>
LED<Power Supply : DC12V>
CNAC2
(RED)
TABN1
TABP2
RED
U
SYMBOL
TB7
CN5
CND
CN2M
SW1
SW11
SW12
LED1
LED2
LED3
LED4
LED5
1
3
RED
RED
TABP
E2
WHT TABN2
WHT
CB
3
1
2
TABV
2
TABS WHT
TABW
2
DS2
BLU
TABP1 RED
TABU
TH8
TABT
3
IPM
7
1 CN3
2(WHT)
1 CN5
2 (RED)
1 CN4
2(WHT)
TABN
DS3
RED
WHT
BLK
CN2
(WHT)
t°
CNDC
(PNK) 2
1
6
1
7
2
2
P. B.
4
N. F.
NO
52C
LO
S2
S3
RED
WHT
INDOOR
UNIT
Io
ACTM
POWER SUPPLY
208 / 230V 60Hz
NI
EI
CY1
CY2
TB1
+1. MODEL SELECT
The black square (■) indicates a switch position.
MODEL
SW6
ON
PUZ-A42NHA5 OFF
+Use copper supply wires.
1 2 3 4 5 6 7 8
ON
PUY-A42NHA5 OFF
1 2 3 4 5 6 7 8
+2. SW5-1 to 4 : Function switch
12
SW5-5.6
ON
OFF
ON
OFF
+2
1 2 3 4 5 6
1 2 3 4 5 6
WIRING SPECIFICATIONS
8
8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application)
The following connection patterns are available.
The outdoor unit power supply patterns vary on models.
1:1 System
Simultaneous twin system
L1
L2
GR
L2
GR
S1
S1
S1
S1
S2
S2
S2
S2
S2
S3
S3
S3
S3
S3
1
2
1
2
S1
Outdoor unit power supply
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cords
Remote controller
Indoor unit
Indoor unit earth
L1
1
2
* Affix a label A that is included with the manuals near each wiring diagram for the indoor and outdoor units..
PLA-A42
PCA-A42
–
2A
15A
Indoor unit model
Indoor unit power supply
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Circuit
rating
Wiring
Wire No. %
size
Outdoor unit model
Outdoor unit power supply
Breaker size
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Outdoor unit power supply
Outdoor unit power supply earth
Indoor unit-Outdoor unit
Indoor unit earth
Remote controller-Indoor unit
Outdoor unit L1-L2
Indoor unit-Outdoor unit S1-S2
Indoor unit-Outdoor unit S2-S3
Remote controller-Indoor unit
PEAD-A42
–
3.50A
15A
A42
Single, 208/230V, 60 Hz
30A
26A
40A
2 % Min. AWG 10
1 % Min. AWG 10
3 % AWG 16 (polar)
1 % Min. AWG 16
2 % AWG 22 (Non-polar)
AC 208/230 V
AC 208/230 V
DC 24 V
DC 12 V
*1
*2
*2
*3
*4
*4
*4
*4
*1. Use earth leakage breaker (NV).
*2. Max. 45 m, 147 ft
If AWG13 used, Max. 50 m, 164 ft.
If AWG13 used and S3 separated, Max. 80m, 262ft.
*3. The 10 m, 30 ft wire is attached in the remote controller accessory. Max. 1500 ft
*4. The figures are NOT always against the ground.
S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulated by the transformer or other device.
Caution: Be sure to install N-Line. Without N-Line, it could cause damage to the unit.
Notes: 1.Wiring size must comply with the applicable local and national code.
2.Use copper supply wires.
3.Use wires rated 600V or more for the power supply cables and the indoor/outdoor unit connecting cables.
4.Install an earth longer than other cables.
230V
Single phase
Isolator
3 poles isolator
S1
S1
A-Control S2
Outdoor Unit
S2
S3
S3
A-Control
Indoor Unit
In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line
and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is
energized. If isolator should be used between indoor unit and outdoor unit, please use 3-pole type .
OCH512
13
8-2. SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES
The following connection patterns are available.
The outdoor unit power supply patterns vary on models.
1:1 System
* The optional indoor power supply terminal kit is required.
L1
L2
GR
S1
S2
S3
L1
L2
GR
S1
S2
S3
Outdoor unit power supply
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cords
Remote controller
Indoor unit
Indoor unit power supply
Option
1
2
* Affix a label B that is included with the manuals near each wiring diagram for the indoor and outdoor units.
Simultaneous twin system
L1
L2
GR
S1
S2
S3
L1
L2
GR
L1
L2
GR
S1
S2
S3
S1
S2
S3
1
2
1
2
Outdoor unit power supply
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cords
Remote controller
Indoor unit
Indoor unit power supply
Option
Indoor unit earth
*Affix a label B that is included with the manuals near each wiring diagram for the indoor and outdoor units.
If the indoor and outdoor units have separate power supplies, refer to the table below.
Change the indoor unit electrical box wiring refering to the figure in the right and
the DIP switch settings of the outdoor unit control board.
Connectors (connections when
shipped from the factory are
for indoor unit power supplied
from outdoor unit)
Indoor unit specifications
Required
Label affixed near each wiring diagram
for the indoor and outdoor units
Required
ON
OFF
S1
S2
S3
3
1
2
(SW8)
CN101
Indoor unit
control board
Connectors
L1
L2
GR
Indoor unit power supplied
from outdoor unit (Initial
setting)
* There are three types of labels (labels A, B, and C). Affix the appropriate labels to
the units according to the wiring method.
S1
S2
S3
BLUE YELLOW
YELLOW BLUE
Outdoor unit DIP switch settings (when
using separate indoor unit/outdoor unit
power supplies only)
L1
L2
GR
BLUE YELLOW
BLUE YELLOW
Indoor unit electrical box connector connection change
If the indoor and
outdoor units have
separate power
supplies, change the
connections of the
connectors as shown
in the following
figure.
CN101
Indoor unit
control board
Separate indoor unit/outdoor unit power
supplies
Indoor unit model
Circuit
rating
Wiring
Wire No. % size
Indoor unit power supply
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Indoor unit power supply
Indoor unit power supply earth
Indoor unit-Outdoor unit
Indoor unit earth
Remote controller-Indoor unit
Indoor unit L1-L2
Indoor unit-Outdoor unit S1-S2
Indoor unit-Outdoor unit S2-S3
Remote controller-Indoor unit
*1
*2
*3
*3
*3
*3
PLA-A42
PCA-A42
PEAD-A42
Single, 208/230 V, 60 Hz
2A
15A
2 % Min. AWG 16
1 % Min. AWG 16
2 % AWG 22 (polar)
–
2 % AWG 22 (Non-polar)
AC 208/230 V
–
DC 24 V
DC 12 V
Single, 208/230 V, 60 Hz
3.50A
15A
–
–
3 % 1.5 (polar)
1 % Min. 1.5
2 % 0.3 (Non-polar)
AC 208/230 V
–
DC 24 V
DC 12 V
*1. Max. 120 m, 393 ft
*2. The 10 m, 30 ft wire is attached in the remote controller accessory. Max. 500 m, 1500 ft
*3. The figures are NOT always against the ground.
Notes: 1.
2.
3.
4.
Wiring size must comply with the applicable local and national code.
Use copper supply wires.
Use wires rated 300V or more for the power supply cables.
Install an earth longer than other cables.
OCH512
14
8-3. INDOOR - OUTDOOR CONNECTING CABLE
Outdoor power supply
Indoor unit-Outdoor unit
Wire No. % Size
Max. 45m, 147ft
Max. 50m, 164ft
3 % AWG16(polar) 3 % AWG13(polar)
Max. 80m, 262ft
3 % AWG13(polar) and S3 separated
+ The max. cable length may vary depending on the condition of installation, humidity or materials, etc.
Wire No. % Size
Indoor/Outdoor separate
power supply
Max. 120m, 393ft
Indoor unit-Outdoor unit
2 % Min. AWG22
+ The optional indoor power supply terminal kit is necessary.
Be sure to connect the indoor-outdoor connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufficient
insulation to ground or a poor electrical contact at the intermediate connection point.
OCH512
15
8-4. M-NET WIRING METHOD
(Points to note)
(1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from
making an influence on the signal communication. Place them at intervals of more than 5 cm. Do not put them in the same
conduit tube.
(2) Terminal block (TB7) for transmission wires should never be connected to 208/230V power supply. If it is connected,
electronic parts on M-NET P.C. board may burn out.
(3) Use 2-core × 1.25mm² [AWG16] shield wire (CVVS, CPEVS) for the transmission wire. Transmission signals may not be
sent or received normally if different types of transmission wires are put together in the same multi-conductor cable. Never
do this because this may cause a malfunction.
Refrigerant
address 00
M-NET
address 01
Group
remote
controller
Power
supply
unit for
transmission
wire
Refrigerant
address 00
M-NET
address 02
A-control
remote
controller
A-control
remote
controller
Refrigerant
address 00
M-NET
address 03
A-control
remote
controller
It would be ok if M-NET wire (non-polar, 2-cores) is arranged in addition to the wiring for A-control.
(4) Ground only one of any appliances through M-NET transmission wire (shield wire). Communication error may occur due to
the influence of electromagnetic noise.
“Ed” error will appear on the LED display of outdoor unit.
“0403” error will appear on the central-control remote controller.
Bad example (Multi spot grounding of shield wire)
Central
remote
controller
Power
supply
appliance
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET transmission wire
Good example 1 (Single spot grounding of shield wire)
Central
remote
controller
Power
supply
appliance
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET transmission wire
Good example 2 (Single spot grounding of shield wire)
Central
remote
controller
Power
supply
appliance
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET transmission wire
If there are more than 2 grounding spots on the shield wire, noise may enter into the shield wire because the ground wire
and shield wire form one circuit and the electric potential difference occurs due to the impedance difference among grounding spots. In case of single spot grounding, noise does not enter into the shield wire because the ground wire and shield
wire do not form one circuit.
To avoid communication errors caused by noise, make sure to observe the single spot grounding method described in the
installation manual.
OCH512
16
● M-NET wiring
(1) Use 2-core × 1.25mm² [AWG16] shield wire for electric wires.
M-NET
terminal
(Excluding the case connecting to system controller.)
Ground
block
wire
(2) Connect the wire to the M-NET terminal block. Connect one core of the
transmission wire (non-polar) to A terminal and the other to B. Peel the
A B S
shield wire, twist the shield part to a string and connect it to S terminal.
Transmission Shield
(3) In the system which several outdoor units are being connected, the terminal
wire part
(A, B, S) on M-NET terminal block should be individually wired to the other
outdoor unit’s terminal, i.e. A to A, B to B and S to S. In this case, choose one of those outdoor units and drive a screw
to fix an ground wire on the plate as shown on the right figure.
8-4-1. M-NET address setting
In A-control models, M-NET address and refrigerant address should be set only for the outdoor unit. Similar to CITY MULTI
series, there is no need to set the address of outdoor unit and remote controller. To construct a central control system, the
setting of M-NET address should be conducted only upon the outdoor unit. The setting range should be 1 to 50 (the same as
that of the indoor unit in CITY MULTI system), and the address number should be consecutively set in a same group.
901
901
901
901
901
78
78
901
23
78
78
~
23
456
23
456
23
456
78
8-4-2. Refrigerant address setting
50
23
456
tens
digit
2
23
456
setting SW12
1
456
SW11
ones
Switching digit
78
<Setting example> M-NET Address No.
Address number can be set by using rotary switches
(SW11 for ones digit and SW12 for tens digit), which
is located on the M-NET board of outdoor unit.
(Initial setting: all addresses are set to “0”.)
In case of multiple grouping system (multiple refrigerant circuits in one group), indoor units should be connected by remote
controller wiring (TB5) and the refrigerant address needs to be set. Leave the refrigerant addresses to “00” if the group setting is not conducted. Set the refrigerant address by using DIP SW1-3 to -6 on the outdoor controller board. [Initial setting: all
switches are OFF. (All refrigerant addresses are “00”.)]
ON
ON
OFF
Refrigerant
address
ON
OFF
1 2 3 4 5 6
0
ON
ON
ON
9
8
ON
10
11
12
13
7
ON
OFF
1 2 3 4 5 6
1 2 3 4 5 6
6
ON
OFF
1 2 3 4 5 6
OFF
1 2 3 4 5 6
5
OFF
1 2 3 4 5 6
ON
OFF
1 2 3 4 5 6
4
ON
OFF
1 2 3 4 5 6
ON
OFF
1 2 3 4 5 6
3
OFF
1 2 3 4 5 6
ON
OFF
1 2 3 4 5 6
2
ON
OFF
1 2 3 4 5 6
ON
OFF
1 2 3 4 5 6
1
OFF
ON
OFF
1 2 3 4 5 6
OFF
1 2 3 4 5 6
1 2 3 4 5 6
14
15
8-4-3. Regulations in address settings
In case of multiple grouping system, M-NET and refrigerant address settings should be done as explained in the above section. Set the lowest number in the group for the outdoor unit whose refrigerant address is “00” as its M-NET address.
Group A
System
controller
Power
supply
unit for
transmission
wire
Group B
Refrigerant
address 00
M-NET
address 01
Group C
Refrigerant
address 00
M-NET
address 02
Refrigerant
address 01
M-NET
address 03
Refrigerant
address 00
M-NET
address 04
TB5
A-control
remote
controller
A-control
remote
controller
A-control
remote
controller
w Refrigerant addresses can be overlapped if they are in the different group.
Group A
System
controller
Power
supply
unit for
transmission
wire
Refrigerant
address 00
M-NET
address 01
Group B
Refrigerant
address 01
M-NET
address 02
Refrigerant
address 00
M-NET
address 04
Refrigerant
address 01
M-NET
address 03
Refrigerant
address 02
M-NET
address 05
TB5
A-control
remote
controller
A-control
remote
controller
w In group B, M-NET address of the outdoor unit whose refrigerant address is “00” is not set to the minimum in the group. As
“03” is right for this situation, the setting is wrong. Taking group A as a good sample, set the minimum M-NET address in
the group for the outdoor unit whose refrigerant address is “00”.
OCH512
17
9
REFRIGERANT SYSTEM DIAGRAM
PUZ-A42NHA5
PUZ-A42NHA5-BS
Unit: mm (inch)
Service port
(check)
High pressure protect switch
4-way
valve
Ball valve
Outdoor heat exchanger
(#50)
Strainer
Refrigerant GAS pipe
15.88 (W5/8)
Thermistor
(TH6)
Service port
(check)
Thermistor
(TH3)
Muffler
Strainer
(#100)
Thermistor
(TH32)
Accumulator
Refrigerant LIQUID pipe
9.52 (W3/8)
Distributor
Compressor
Strainer
(#100)
Strainer
(#100)
Stop valve
(with service port)
Linear expansion valve
Refrigerant flow in cooling
Refrigerant flow in heating
PUY-A42NHA5
PUY-A42NHA5-BS
Unit: mm (inch)
Ball valve
Refrigerant GAS pipe
15.88 (W5/8)
(#50)
Strainer
Service port
(check)
Strainer
(#100)
Service port
(check)
High pressure
protect switch
Accumulator
Thermistor
(TH32)
Outdoor heat exchanger
Thermistor
(TH6)
Thermistor
(TH3)
Distributor
Compressor
Refrigerant LIQUID pipe
9.52 (W3/8)
Strainer
(#100)
Stop valve
(with service port)
Strainer
(#100)
Linear expansion valve
Refrigerant flow in cooling
OCH512
18
1. Refrigerant collecting (pump down)
Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit.
1 Supply power (circuit breaker).
* When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CENTRALLY
CONTROLLED” is displayed, the refrigerant collecting (pump down) cannot be completed normally.
* Start-up of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down
operation 3 to 4 minutes after the power (circuit breaker) is turned ON.
2 After the liquid stop valve is closed, set SW1-1 on the control board of the outdoor unit to ON. The compressor (outdoor unit) and ventilators
(indoor and outdoor units) start operating and refrigerant collecting operation begins. LED1 and LED2 on the control board of the outdoor
unit are lit.
* Only set SW1-1 to ON if the unit is stopped. However, even if the unit is stopped and SW1-1 is set to ON less than three minutes after
the compressor stops, the refrigerant collecting operation cannot be performed. Wait until compressor has been stopped for three minutes
and then set SW1-1 to ON again.
3 Because the unit automatically stops in about two to three minutes when the refrigerant collecting operation is completed (LED1 off, LED2
lit), be sure to quickly close the gas stop valve. If LED1 is lit and LED2 is off and the outdoor unit is stopped, refrigerant collection is not
properly performed. Open the liquid stop valve completely, and then repeat step 2 after three minutes have passed.
* If the refrigerant collecting operation has been completed normally (LED1 off, LED2 lit), the unit will remain stopped until the power supply
is turned off.
4 Turn off the power supply (circuit breaker).
* Note that when the extension piping is very long with large refrigerant amount, it may not be possible to perform a pump-down operation.
Warning:
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if
air etc. get into it.
2. Refrigerant pipe airtight testing method
(1) Connect the testing tools.
• Make sure the stop valves A B are closed and do not open them.
• Add pressure to the refrigerant lines through the service port C of the liquid stop valve D.
(2) Do not add pressure to the specified pressure all at once; add pressure little by little.
1 Pressurize to 0.5 MPa (5 kgf/cm²G), wait 5 minutes, and make sure the pressure does not decrease.
2 Pressurize to 1.5 MPa (15 kgf/cm²G), wait 5 minutes, and make sure the pressure does not decrease.
3 Pressurize to 4.15 MPa (41.5 kgf/cm²G) and measure the surrounding temperature and refrigerant pressure.
(3) If the specified pressure holds for about one day and does not decrease, the pipes have passed the test and there are no leaks.
• If the surrounding temperature changes by 1°C, the pressure will change by about 0.03 MPa (0.3 kgf/cm²G). Make the necessary corrections.
(4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source of the gas leak.
Stop valve <Liquid side>
Stop valve <Gas side>
Service port
Open/Close section
Local pipe
Sealed, same way for gas side
Pipe cover
Do not use a wrench here.
Refrigerant leakage may result.
Use 2 wrenches here.
3. Start and finish of test run
• Operation from the indoor unit
Execute the test run using the installation manual for the indoor unit.
• Operation from the outdoor unit
By using the DIP switch SW4 on the control board of outdoor unit, test run can be started and finished, and its operation <SW4>
mode (cooling/heating) can be set up.
1 Set the operation mode (cooling/heating) using SW4-2.
ON
2 Turn on SW4-1 to start test run with the operation mode set by SW4-2.
OFF
3 Turn off SW4-1 to finish the test run.
1
• There may be a faint knocking sound around the machine room after power is supplied, but this is
not a problem with the product because the linear expansion valve is just moving to adjust opening pulse.
• There may be a knocking sound around the machine room for several seconds after compressor
starts operating. But this is not a problem with product because the check valve itself generates
the sound because pressure difference is small in the refrigerant circuit.
2
Stop
Operation
Cooling Heating
(PUZ only)
Note:
The operation mode cannot be changed by SW4-2 during test run. (To change test run mode, stop the unit by SW4-1,
change the operation mode and restart the test run by SW4-1.)
OCH512
19
10
TROUBLESHOOTING
10-1. TROUBLESHOOTING
<Error code display by self-diagnosis and actions to be taken for service (summary)>
Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit.
Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the
table below. Check the contents below before investigating details.
Unit conditions at service
Error code
Actions to be taken for service (summary)
Displayed
Judge what is wrong and take a corrective action according
to “10-4. Self-diagnosis action table”.
Not displayed
Conduct trouble shooting and ascertain the cause of the
trouble according to “10-5. Troubleshooting of problems”.
Logged
Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring and etc.
Reset error code logs and restart the unit after finishing
service.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.
Not logged
Re-check the abnormal symptom.
Conduct trouble shooting and ascertain the cause of the
trouble according to “10-5. Troubleshooting of problems”.
Continue to operate unit for the time being if the cause
is not ascertained.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.
The trouble is reoccurring.
The trouble is not reoccurring.
10-2. CHECK POINT UNDER TEST RUN
(1) Before test run
• After installation of indoor and outdoor units, piping work and electric wiring work, re-check that there is no refrigerant leakage, loosened connections and incorrect polarity.
• Measure impedance between the ground and the power supply terminal block (L1, L2) on the outdoor unit by 500V Megger
and check that it is 1.0M" or over.
w Do not use 500V Megger to indoor/outdoor connecting wire terminal block (S1, S2, S3) and remote controller terminal
block (1, 2). This may cause malfunction.
• Make sure that test run switch (SW4) is set to OFF before turning on power supply.
• Turn on power supply 12 hours before test run in order to protect compressor.
• For specific models which requires higher ceiling settings or auto-recovery feature from power failure, make proper changes
of settings referring to the description of “12. FUNCTION SETTING”.
Make sure to read operation manual before test run. (Especially items to secure safety.)
OCH512
20
"TEST RUN" and the currently selected
operation mode are displayed alternately.
Displays the remaining
test run time.
Operating procedures
1. Turn on the main power supply.
2. Press TEST button twice.
The TEST RUN appears on the screen.
3. Press OPERATION SWITCH
button.
Cooling mode: Check if cool air blows and water is drained.
Heating mode: Check if warm air blows. (It takes a little
while until warm air blows.)
F
4. Press AIR DIRECTION button. Check for correct motion of auto-vanes.
5. Check the outdoor unit fan for
correct running.
While the room temperature display on the remote
controller is “PLEASE WAIT”, the remote controller is disabled.
Wait until “PLEASE WAIT” disappears before using remote controller.
“PLEASE WAIT” appears for about 2 minutes after power
supply is turned on. +1
[TEST] button
Pipe (liquid) temperature
The outdoor unit features automatic capacity control to
provide optimum fan speeds. Therefore, the fan keeps
running at a low speed to meet the current outside air
condition unless it exceeds its available maximum power.
Then, in actuality, the fan may stop or run in the reverse
direction depending on the outside air, but this does not
mean malfunction.
6. Press the ON/OFF button to reset the test run in progress.
7. Register the contact number.
• In case of test run, the OFF timer will be activated, and the test run will automatically stop after 2 hours.
• The room temperature display section shows the pipe temperature of indoor units during the test run.
• Check that all the indoor units are running properly in case of simultaneous twin operation. Malfunctions may not be displayed regardless of incorrect wiring.
w1 After turning on the power supply, the system will go into startup mode, “PLEASE WAIT” will blink on the display section
of the room temperature, and lamp (green) of the remote controller will blink.
As to INDOOR BOARD LED, LED1 will be lit, LED2 will either be lit in case the address is 0 or turned off in case the
address is not 0. LED3 will blink.
As to OUTDOOR BOARD LED, LED1 (green) and LED2 (red) will be lit. (After the startup mode of the system finishes,
LED2 (red) will be turned off.)
In case OUTDOOR BOARD LED is digital display,
— and —
will be displayed alternately every second.
• If one of the above operations does not function correctly, the causes written below should be considered. Find causes from
the symptoms.
The below symptoms are under test run mode. “startup” in the table means the display status of w1 written above.
Symptoms in test run mode
OUTDOOR BOARD LED Display
Remote Controller Display
< > indicates digital display.
After “startup” is displayed, only
Remote controller displays “PLEASE
green lights up. <00>
WAIT”, and cannot be operated.
After “startup” is displayed,
green (once) and red (once)
After power is turned on, “PLEASE WAIT” blink alternately. <F1>
is displayed for 3 minutes, then error code
After “startup” is displayed,
is displayed.
green (once) and red (twice)
blink alternately. <F5>
After “startup” is displayed,
green (twice) and red (once)
No display appears even when remote
blink alternately. <EA, Eb, EC>
controller operation switch is turned on.
After “startup” is displayed, only
(Operation lamp does not light up.)
green lights up. <00>
Display appears but soon disappears
even when remote controller is operated.
After “startup” is displayed, only
green lights up. <00>
Cause
• After power is turned on, “PLEASE WAIT” is displayed for 2
minutes during system startup. (Normal)
• Incorrect connection of outdoor terminal block (L1, L2, and
S1, S2, S3.)
• Outdoor unit’s protection device connector is open.
• Incorrect wiring between the indoor and outdoor unit (Polarity
is wrong for S1, S2, S3.)
• Remote controller transmission wire is short.
• There is no outdoor unit of address 0.
(Address is other than 0.)
• Remote controller transmission wire is open.
• After canceling function selection, operation is not possible for
about 30 seconds. (Normal)
w Press the remote controller’s CHECK button twice to perform self-diagnosis. See the table below for the contents of LCD
display.
LCD
P1
P2
P4
P5
P6
P8
P9
Fb
Contents of inferior phenomena
Abnormality of room temperature thermistor
Abnormality of pipe temperature thermistor/Liquid
Abnormality of drain sensor/Float switch connector open
Drain overflow protection is working.
Freezing/overheating protection is working.
Abnormality of pipe temperature
Abnormality of pipe temperature thermistor/Cond./Eva
Abnormality of indoor controller board
LCD
U1~UP
F3~F9
E0~E5
E6~EF
---FFFF
PA
Contents of inferior phenomena
Malfunction outdoor unit
Malfunction outdoor unit
Remote controller transmitting error
Indoor/outdoor unit communication error
No error history
No applied unit
Forced compressor stop(due to water leakage abnormality)
See the table below for details of the LED display (LED 1, 2, 3) on the indoor controller board.
LED1 (microprocessor power supply)
LED2 (remote controller)
LED3 (indoor/outdoor communication)
OCH512
Lights when power is supplied.
Lights when power is supplied for wired remote controller.
The indoor unit should be connected to the outdoor unit with address “0” setting.
Flashes when indoor and outdoor unit are communicating.
21
Test run [for IR wireless remote controller]
COOL
TEST
RUN
TEMP
ON/OFF
MODE
,
FAN
AUTO STOP
VANE
AUTO START
CHECK LOUVER
min
TEST RUN
SET
OCH512
h
RESET
CLOCK
Measure an impedance between the power supply terminal block on
the outdoor unit and ground with a 500V Megger and check that it is
equal to or greater than 1.0M".
1 Turn on the main power to the unit.
TEST RUN
2 Press the
button twice continuously.
(Start this operation from the turned off status of remote controller
display.)
TEST RUN
and current operation mode are displayed.
3 Press the MODE (
) button to activate COOL mode, then
check whether cool air is blown out from the unit.
4 Press the MODE (
) button to activate HEAT mode, then
check whether warm air is blown out from the unit.
5 Press the FAN button and check whether strong air is blown out
from the unit.
VANE
6 Press the
button and check whether the auto vane operates
properly.
7 Press the ON/OFF button to stop the test run.
Note:
• Point the remote controller towards the indoor unit receiver
while following steps 2 to 7.
• It is not possible to run in FAN, DRY or AUTO mode.
22
10-3. HOW TO PROCEED "SELF-DIAGNOSIS"
10-3-1. When a Problem Occurs During Operation
If a problem occurs in the air conditioner, the indoor and outdoor units will stop,
and the problem is shown in the remote controller display.
[CHECK] and the refrigerant address are displayed on the temperature
display, and the error code and unit number are displayed alternately as
shown below.
(If the outdoor unit is malfunctioning, the unit number will be "00".)
In the case of group control, for which remote controller controls
multiple refrigerant systems, the refrigerant address and error code of the
unit that first experienced trouble (i.e., the unit that transmitted the error
code) will be displayed.
To clear the error code, press the
ON/OFF button.
(Alternating Display)
Error code (2 or 4 digits)
Address (3 digits) or unit number (2 digits)
When using remote-/local-controller combined operation, cancel the error code after turning off remote operation. During
central control by a MELANS controller, cancel the error code by pressing the
ON/OFF button.
10-3-2. Self-Diagnosis During Maintenance or Service
Since each unit has a function that stores error codes, the latest check code can be recalled even if it is cancelled by the remote
controller or power is shut off.
Check the error code history for each unit using the remote controller.
Switch to self-diagnosis mode.
Set the unit number or refrigerant address you want to diagnose.
Press the [TEMP] buttons (
and
) to select the desired
number or address. The number (address) changes between [01] and [50]
or [00] and [15].
Press the CHECK button twice within 3 seconds.
The display content will change as shown below.
The refrigerant address will begin to blink
approximately 3 seconds after being
selected and the self-diagnosis process will begin.
Unit number or refrigerant address
to be diagnosed
Display self-diagnosis results.
<When there is error code history>
(For the definition of each error code, refer to the indoor unit's installation manual or service handbook.)
(Alternating Display)
Error code (2 or 4 digits)
Address (3 digits) or unit number (2 digits)
<When there is no error code history>
Reset the error history.
Display the error history in the diagnosis result display screen (see step ).
OCH512
23
<When there is no corresponding unit>
Press the ON/OFF button twice within 3 seconds.
The self-diagnosis address or refrigerant address will blink.
When the error history is reset, the display will look like the one shown below.
However, if you fail to reset the error history, the error content will be displayed again.
Cancel self-diagnosis.
Self-diagnosis can be cancelled by the following 2 methods.
Press the Press the
CHECK
button twice within 3 seconds. Self-diagnosis will be cancelled and the screen will return to the previous state in effect before the start
of self-diagnosis.
ON/OFF button.
Self-diagnosis will be cancelled and the indoor unit will stop.
10-3-3. Remote Controller Diagnosis
If the air conditioner cannot be operated from the remote controller, diagnose the remote controller as explained below.
First, check that the power-on indicator is lit.
If the correct voltage (DC12 V) is not supplied to the remote controller, the
indicator will not light.
If this occurs, check the remote controller's wiring and the indoor unit.
Power on indicator
Switch to the remote controller self-diagnosis mode.
Press the CHECK
button for 5 seconds or more.
Press the FILTER button to start self-diagnosis.
The display content will change as shown below.
Remote controller self-diagnosis result
[When the remote controller is functioning correctly]
[When the remote controller malfunctions]
(Error display 1) "NG" blinks. ©The remote controller's transmitting-receiving circuit is defective.
Check for other possible causes, as there is no problem with the remote
controller.
The remote controller must be replaced with a new one.
[Where the remote controller is not defective, but cannot be operated.]
(Error display 2) [E3], [6833] or [6832] blinks. © Transmission is not possible.
There might be noise or interference on the transmission path, or the indoor unit
or other remote controllers are defective. Check the transmission path and other
controllers.
(Error display 3) "ERC" and the number of data errors are displayed.
© Data error has occurred.
The number of data errors is the difference between the number of bits sent from
the remote controller and the number actually transmitted through the transmission path. If such a problem is occurring, the transmitted data is affected by noise,
etc. Check the transmission path.
When the number of data errors is "02":
Transmission data from remote controller
Transmission data on transmission path
To cancel remote controller diagnosis
Press the CHECK button for 5 seconds or more. Remote controller diagnosis will be cancelled, "PLEASE WAIT" and operation lamp will blink.
After approximately 30 seconds, the state in effect before the diagnosis will be restored.
OCH512
24
10-3-4. Malfunction-diagnosis method by IR wireless remote controller
<In case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.
<Malfunction-diagnosis method at maintenance service>
[Procedure]
Refrigerant
address
display
CHECK
CHECK
display
Temperature
button
TEMP
ON/OFF
1. Press the CHECK button twice.
• "CHECK" lights, and refrigerant address
"00" blinks.
• Check that the remote controller's
display has stopped before continuing.
2. Press the temperature
buttons.
• Select the refrigerant address of the
indoor unit for the self-diagnosis.
Note: Set refrigerant address using the
outdoor unit’s DIP switch (SW1).
(For more information, see the
outdoor unit installation manual.)
3. Point the remote controller at
the sensor on the indoor unit
and press the HOUR button.
• If an air conditioner error occurs, the
indoor unit's sensor emits an intermittent
buzzer sound, the operation lamp blinks,
and the error code is output.
(It takes 3 seconds at most for error
code to appear.)
4. Point the remote controller at
the sensor on the indoor unit
and press the ON/OFF button.
• The check mode is cancelled.
ON/OFF
button
MODE
FAN
AUTO STOP
VANE
AUTO START
CHECK LOUVER
CHECK
button
min
TEST RUN
SET
OCH512
h
HOUR
button
RESET
CLOCK
25
• Refer to the following tables for details on the check codes.
[Output pattern A]
Beeper sounds
OPERATION
INDICATOR
lamp blink
pattern
Beep
Beep Beep Beep
Off
Beep
1st
2 nd
3 rd
nth
On
On
On
On
Beep Beep
1st
Off
On
2 nd · · · Repeated
On
0.5 sec. Approx. 2.5 sec. 0.5 sec. 0.5 sec.
Self-check Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
starts
(Start signal
Number of blinks/beeps in pattern indicates the check
Number of blinks/beeps in pattern indicates
received)
code in the following table (i.e., n=5 for “P5”)
the check code in the following table
[Output pattern B]
Beeper sounds
OPERATION
INDICATOR
lamp blink
pattern
Beep
Beep Beep Beep
1st
Off
On
Approx. 3 sec.
Self-check Approx. 2.5 sec.
starts
(Start signal
received)
2nd
3 rd
On
On
On
0.5 sec. 0.5 sec. 0.5 sec.
Beep
Beep
nth
1st
On
Off
0.5 sec. Approx. 2.5 sec.
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
On
Approx. 3 sec.
Beep
2 nd · · · Repeated
On
On
0.5 sec. 0.5 sec.
Number of blinks/beeps in pattern indicates
the check code in the following table
[Output pattern A] Errors detected by indoor unit
IR wireless remote controller Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
Check code
(Number of times)
1
P1
P2
2
P9
3
E6,E7
4
P4
P5
5
PA
6
P6
7
EE
8
P8
9
E4, E5
–
10
–
11
12
Fb
E0, E3
–
–
E1, E2
Symptom
Intake sensor error
Pipe (TH2) sensor error
Pipe (TH5) sensor error
Indoor/outdoor unit communication error
Drain sensor error/Float switch connector open
Drain pump error
Forced compressor stop (due to water leakage abnormality)
Freezing/Overheating protection operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
Remote controller transmission error
Remote controller control board error
Remark
As for indoor
unit, refer to
indoor unit's
service manual.
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
IR wireless remote controller Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
Check code
(Number of times)
1
E9
2
3
4
5
UP
U3,U4
UF
U2
6
U1,Ud
7
8
9
U5
U8
U6
11
U9,UH
Symptom
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/insufficient refrigerant
Abnormal high pressure (63H operated)/Overheating
protection operation
Abnormal temperature of heatsink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
–
–
Other errors
Remark
For details, check
the LED display
of the outdoor
controller board.
–
12
–
13
Others
14
*1 If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on, there are no error records.
*2 If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
OCH512
26
10-4. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on> (Note 1) Refer to indoor unit section for code P and code E.
Abnormal point and detection method
Error Code
Judgment and action
Case
1 No voltage is supplied to termi- 1 Check following items.
a) Power supply breaker
nal block (TB1) of outdoor unit.
b) Connection of power supply terminal block
a) Power supply breaker is
(TB1)
turned off.
c) Connection of power supply terminal block
b) Contact failure or disconnec(TB1)
tion of power supply terminal
c) Open phase (L1 or L2
phase)
2 Electric power is not charged to 2 Check following items.
a) Connection of power supply terminal block
power supply terminal of out(TB1)
door power circuit board.
b) Connection of terminal on outdoor power
a) Contact failure of power supcircuit board
ply terminal
Disconnection of connector TABT or TABS
b) Open phase on the outdoor
Refer to 10-9.
power circuit board
Disconnection of connector
TABT or TABS
—
None
3 Electric power is not supplied
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
3 Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Refer to 10-9.
4 Disconnection of reactor (DCL) 4 Check connection of “L1” and “L2” on the
active filter module. (ACTM) Refer to 10-9.
5 Disconnection of outdoor noise 5 a) Check connection of outdoor noise filter
circuit board.
filter circuit board or parts failb) Replace outdoor noise filter circuit board.
ure in outdoor noise filter circuit
Refer to 10-9.
board
It is especially needed to check
the resistance RS1 on the
noise filter circuit board.
6 Defective outdoor power circuit 6 Replace outdoor power circuit board.
board
7 Defective outdoor controller cir- 7 Replace controller board (When items
above are checked but the units cannot be
cuit board
repaired).
63H connector open
1 Disconnection or contact failure 1 Check connection of 63H connector on
Abnormal if 63H connector circuit is open for
outdoor controller circuit board.
of 63H connector on outdoor
3 minutes continuously after power supply.
Refer to 10-9.
controller circuit board
63H: High-pressure switch
2 Disconnection or contact failure 2 Check the 63H side of connecting wire.
of 63H
F5
(5201)
OCH512
3 63H is operating due to
defective parts.
3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Defective outdoor controller
circuit board
4 Replace outdoor controller circuit board.
27
Error Code
Abnormal point and detection method
Indoor/outdoor unit connector
miswiring, excessive number of units
1. Outdoor controller circuit board can
automatically check the number of
connected indoor units. Abnormal if the
number cannot be checked automatically
due to miswiring of indoor/outdoor unit
connecting wire and etc. after power is
turned on for 4 minutes.
2. Abnormal if outdoor controller circuit
board recognizes excessive number of
indoor units.
EA
(6844)
Case
1 Contact failure or miswiring of
indoor/outdoor unit connecting
wire
Judgment and action
1 Check disconnection or looseness or polarity
of indoor/outdoor unit connecting wire of
indoor and outdoor units.
2 Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
2 Check diameter and length of indoor/outdoor
unit connecting wire.
Total wiring length: 80m [262ft]
(including wiring connecting each indoor unit
and between indoor and outdoor unit)
Also check if the connection order of flat
cable is S1, S2, S3.
3 4 or more indoor units are
connected to 1 outdoor unit.
4 Defective transmitting receiving
3 Check the number of indoor units that are
circuit of outdoor controller
connected to one outdoor unit. (If EA is
circuit board
detected)
5 Defective transmitting receiving
circuit of indoor controller board 4~6 Turn the power off once, and on again to
check.
Replace outdoor controller circuit board,
6 Defective indoor power board
indoor controller board or indoor power
board if abnormality occurs again.
7 2 or more outdoor units have
refrigerant address “0” .
7 Check if refrigerant addresses (SW1-3 to
(In case of group control)
SW1-6 on outdoor controller circuit board) are
overlapping in case of group control system.
8 Noise has entered into power
supply or indoor / outdoor unit
8 Check transmission path, and remove the
connecting wire.
cause.
Miswiring of indoor/outdoor unit
1 Contact failure or miswiring of
connecting wire (converse wiring or
indoor/outdoor unit connecting
wire
disconnection)
Outdoor controller circuit board can
automatically set the unit number of indoor 2 Diameter or length of indoor/
outdoor unit connecting wire is
units.
out of specified capacity.
Abnormal if the indoor unit number cannot
be set within 4 minutes after power on
4 Defective transmitting receiving
because of miswiring (converse wiring
circuit of outdoor controller
or disconnection) of indoor/outdoor unit
circuit board
connecting wire.
Eb
(6845)
5 Defective transmitting receiving
circuit of indoor controller board
6 Defective indoor power board
7 2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
8 Noise has entered into power
supply or indoor/outdoor unit
connecting wire.
Start-up time over
The unit cannot finish start-up process
within 4 minutes after power on.
1 Contact failure of indoor/
outdoor unit connecting wire
2 Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
EC
(6846)
7 2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
8 Noise has entered into power
supply or indoor/outdoor unit
connecting wire.
OCH512
28
w The descriptions above, 1-8, are for EA, Eb
and EC.
<Abnormalities detected while unit is operating>
Error Code
Abnormal point and detection method
High pressure (High-pressure switch
63H operated)
Abnormal if high-pressure switch 63H operated ( w ) during compressor operation.
w 4.15 MPa [602PSIG]
63H: High-pressure switch
U1
(1302)
Case
1 Short cycle of indoor unit
2 Clogged filter of indoor unit
3 Decreased airflow caused by
dirt of indoor fan
4 Dirt of indoor heat exchanger
5 Locked indoor fan motor
6 Malfunction of indoor fan motor
7 Defective operation of stop
valve (Not full open)
8 Clogged or broken pipe
9 Locked outdoor fan motor
0 Malfunction of outdoor fan
motor
1 Short cycle of outdoor unit
2 Dirt of outdoor heat exchanger
3 Decreased airflow caused by
defective inspection of outside
temperature thermistor
(It detects lower temperature
than actual temperature.)
4 Disconnection or contact failure
of connector (63H) on outdoor
controller board
5 Disconnection or contact failure
of 63H connection
6 Defective outdoor controller
board
7 Defective action of linear
expansion valve
8 Malfunction of fan driving circuit
Judgment and action
1~6Check indoor unit and repair the defect.
7 Check if stop valve is fully open.
8 Check piping and repair the defect.
9~2 Check outdoor unit and repair the defect.
3 Check the inspected temperature of outside
temperature thermistor on LED display.
(SW2 on A-Control Service Tool : Refer to
10-10.)
4~6 Turn the power off and check F5 is
displayed when the power is on again.
When F5 is displayed, refer to “Judgment
and action” for F5.
7 Check linear expansion valve.
Refer to 10-6, 7.
8 Replace outdoor controller board.
High comp.shell temperature
Abnormal if comp.shell temperature
thermistor (TH32) exceeds 125: [257˚F].
1 Overheated compressor opera- 1 Check intake superheat.
Check leakage of refrigerant.
tion caused by shortage of
Charge additional refrigerant.
refrigerant
2 Check if stop valve is fully open.
2 Defective operation of stop
valve
34 Turn the power off and check if U3 is dis3 Defective thermistor
played when the power is on again.
4 Defective outdoor controller
When U3 is displayed, refer to “Judgement
board
and action” for U3.
5 Check linear expansion valve.
5 Defective action of linear
Refer to 10-6, 7.
expansion valve
Open/short circuit of comp.shell
thermistor (TH32)
Abnormal if open (3: [37˚F] or less) or
short (217: [422˚F] or more) is detected
during compressor operation.
(Detection is inoperative for 10 minutes
U3
(TH32: 5132) of compressor starting process and for 10
minutes after and during defrosting.)
1 Disconnection or contact failure 1 Check connection of connector (TH32) on the
of connector (TH32) on the
outdoor controller circuit board.
outdoor controller circuit board
Check breaking of the lead wire for thermistor
(TH32). Refer to 10-9.
2 Check resistance value of thermistor (TH32)
2 Defective thermistor
or temperature by microprocessor.
(Thermistor/TH32: Refer to 10-6.)
(SW2 on A-Control Service Tool: Refer to
10-10.)
3 Defective outdoor controller
3 Replace outdoor controller board.
circuit board
U2
(TH32: 1132)
OCH512
29
Error Code
Abnormal point and detection method
Open/short of outdoor unit thermistors
(TH3, TH6, TH7, and TH8)
Abnormal if open or short is detected
during compressor operation.
Open detection of thermistors TH3 and
TH6 is inoperative for 10 seconds to 10
minutes after compressor starting and 10
minutes after and during defrosting.
WCheck which unit has abnormality in its
thermistor by switching the mode of
SW2. (PAC-SK52ST)
(Refer to 10-10.)
U4
(TH3:5105)
(TH6:5107)
(TH7:5106)
(TH8:5110)
Symbol
TH3
TH6
TH7
TH8
1 Disconnection or contact failure 1 Check connection of connector (TH3,TH6/TH7)
of connectors
on the outdoor controller circuit board.
Outdoor controller circuit
Check connection of connector (CN3) on the
board: TH3,TH6/TH7
outdoor power circuit board.
Outdoor power circuit board:
Check breaking of the lead wire for thermistor
CN3
(TH3,TH6,TH7,TH8). Refer to 10-9.
2 Defective thermistor
2 Check resistance value of thermistor
(TH3,TH6,TH7,TH8) or check temperature by
3 Defective outdoor controller
circuit board
microprocessor.
(Thermistor / TH3, TH6, TH7, TH8 : Refer to
10-6.)
(SW2 on A-Control Service Tool: Refer to
10-10.)
3 Replace outdoor controller circuit board.
WEmergency operation is available in case of
abnormalities of TH3, TH6 and TH7.
Refer to 10-8.
)
(
Thermistors
Name
Thermistor <Outdoor pipe>
Thermistor <Outdoor 2-phase pipe>
Thermistor <Outdoor>
Thermistor <Heatsink>
Temperature of heatsink
Abnormal if heatsink thermistor (TH8)
detects temperature indicated below.
A42N··························84:, 183˚F
Judgment and action
Case
Open detection
Short detection
– 40[-40°F] or below
– 40[-40°F] or below
– 40[-40°F] or below
– 27[-17°F] or below
90[194°F] or above
90[194°F] or above
90[194°F] or above
102[216°F] or above
1 The outdoor fan motor is
locked.
2 Failure of outdoor fan motor
3 Air flow path is clogged.
4 Rise of ambient temperature
5 Defective thermistor
6 Defective input circuit of
outdoor power circuit board
7 Failure of outdoor fan drive
circuit
U5
(4230)
U6
(4250)
Power module
1 Outdoor stop valve is closed.
Check abnormality by driving power module 2 Decrease of power supply voltage
in case overcurrent is detected.
3 Looseness, disconnection or
(UF or UP error condition)
converse of compressor wiring
connection
4 Defective compressor
5 Defective outdoor power circuit
board
OCH512
30
12 Check outdoor fan.
3 Check airflow path for cooling.
4 Check if there is something which causes
temperature rise around outdoor unit.
(Upper limit of ambient temperature is 46:
[114˚F].)
Turn off power, and on again to check if U5
is displayed within 30 minutes.
If U4 is displayed instead of U5, follow the
action to be taken for U4.
5 Check resistance value of thermistor (TH8)
or temperature by microprocessor.
(Thermistor/TH8: Refer to 10-6.)
(SW2 on A-Control Service Tool: Refer to
10-10.)
6 Replace outdoor power circuit board.
7 Replace outdoor controller circuit board.
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor. Refer to 10-9 (Outdoor power
circuit board).
4 Check compressor referring to 10-6.
5 Replace outdoor power circuit board.
Abnormal point and detection method
Error Code
U8
(4400)
Case
Outdoor fan motor
1 Failure in the operation of the
Abnormal if the rotational frequency of fan
DC fan motor
motor is not detected during DC fan motor 2 Failure in the outdoor circuit
operation.
controller board
Fan motor rotational frequency is abnormal
if;
• 100 rpm or below detected continuously
for 15 seconds at 20: [68˚F] or more
outside air temperature.
• 50 rpm or below or 1500 rpm or more
detected continuously for 1 minute.
1 Check or replace the DC fan motor.
1 Decrease of power supply
voltage
2 Disconnection of compressor
Abnormal if any of followings are detected
wiring
during compressor operation;
3 Disconnection or loose
• Decrease of DC bus voltage to 310V
connection of CN52C
• Instantaneous decrease of DC bus voltage 4 Defective ACT module
to 200V
• Increase of DC bus voltage to 400V
5 Defective ACT module drive
• Decrease of input current of outdoor unit
circuit of outdoor power circuit
to 0.5A only if operation frequency is more
board
than or equal to 40Hz or compressor
6 Disconnection or loose
current is more than or equal to 5A.
connection of CNAF
• Abnormal power synchronous (zero cross)
signal
7 Defective 52C drive circuit of
outdoor noise filter circuit board
8 Disconnection or loose
connection of CN5 on the
outdoor power circuit board
9 Disconnection or loose
connection of CN2 on the
outdoor power circuit board
1 Check the facility of power supply.
2 Correct the wiring (U·V·W phase) to
compressor. Refer to 10-9 (Outdoor power
circuit board).
3 Check CN52C wiring.
Overvoltage or voltage shortage and
synchronous signal to main circuit
U9
(4220)
UF
(4100)
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating.
1 Stop valve is closed.
2 Decrease of power supply
voltage
3 Looseness, disconnection or
converse of compressor wiring
connection
4 Defective compressor
5 Defective outdoor power board
6 Dip Switch setting for selecting
model is incorrect on the
outdoor power circuit board.
UH
(5300)
Judgment and action
2 Check the voltage of the outdoor circuit
controller board during operation.
3 Replace the outdoor circuit controller board.
(when the failure is still indicated even after
performing the action 1 above.)
4 Replace ACT module.
5 Replace outdoor power circuit board.
6 Check CNAF wiring.
7 Replace outdoor noise filter circuit board.
8 Check CN5 wiring on the outdoor power
circuit board. Refer to 10-9.
9 Check CN2 wiring on the outdoor power
circuit board.
Refer to 10-9.
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor.
Refer to 10-9 (Outdoor power circuit board).
4 Check compressor.
Refer to 10-6.
5 Replace outdoor power circuit board.
6 Check that the Dip Switch setting is correct
on the outdoor power circuit board by
referring to "Model Select" in "1) Function of
switches" in 10-10.
Current sensor error
1 Disconnection of compressor
1 Correct the wiring (U·V·W phase) to
• Abnormal if current sensor detects –1.5A
wiring
compressor. Refer to 10-9 (Outdoor power
to 1.5A during compressor operation.
circuit board).
(This error is ignored in case of test run
2 Defective circuit of current
2 Replace outdoor power circuit board.
mode.)
sensor on outdoor power circuit
w This error is ignored in case of test run
board
mode.
3 Decrease of power supply
3 Check the facility of power supply.
• It’s abnormal for 38A the input current or
voltage
10 seconds continuous 34A or more.
OCH512
31
Error Code
UP
(4210)
Abnormal point and detection method
E1
or
E2
E3
or
E5
Judgment and action
Compressor overcurrent interruption
1 Stop valve of outdoor unit is
Abnormal if overcurrent DC bus or comclosed.
pressor is detected after compressor starts 2 Decrease of power supply voltoperating for 30 seconds.
age
3 Looseness, disconnection or
converse of compressor wiring
connection
4 Defective fan of indoor/outdoor
units
5 Short cycle of indoor/outdoor
units
6 Defective input circuit of outdoor controller board
7 Defective compressor
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor. Refer to 10-9 (Outdoor power
circuit board).
4 Check indoor/outdoor fan.
5 Solve short cycle.
6 Replace outdoor controller circuit board.
7 Check compressor.
Refer to 10-6.
W Before the replacement of the outdoor
controller circuit board, disconnect the wiring
to compressor from the outdoor power circuit
board and check the output voltage among
phases, U, V, W, during test run. No defect
on board if voltage among phases (U-V, V-W
and W-U) is same. Make sure to perform the
voltage check with same performing frequency.
1 Contact failure at transmission
wire of remote controller
2 All remote controllers are set
as “sub” remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.
3 Miswiring of remote controller
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
of refrigerant address “0”.
6 Noise has entered into the
transmission wire of remote
controller.
1 Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2 Set one of the remote controllers “main”.
If there is no problem with the action above.
3 Check wiring of remote controller.
• Total wiring length: max. 500m [1640ft]
(Do not use cable o 3 or more.)
• The number of connecting indoor units:
max. 16 units
• The number of connecting remote controller: max. 2 units
Remote controller transmission error
(E0)/signal receiving error (E4)
1 Abnormal if main or sub remote controller cannot receive normally any transmission from indoor unit of refrigerant
address “0” for 3 minutes.
(Error code : E0)
2 Abnormal if sub-remote controller could
not receive for any signal for 2 minutes.
(Error code: E0)
E0
or
E4
Case
1 Abnormal if indoor controller board can
not receive any data normally from
remote controller board or from other
indoor controller board for 3 minutes.
(Error code: E4)
2 Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Error code: E4)
Remote controller control board
1 Defective remote controller
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
When the above-mentioned problem of 1~3
are not applied.
4 Diagnose remote controllers.
a) When “RC OK” is displayed,
remote controllers have no problem.
Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
b) When “RC NG” is displayed,
replace remote controller.
c) When “RC E3” or "ERC 00-66" is displayed, noise may be causing abnormality.
* If the unit is not normal after replacing indoor
controller board in group control, indoor controller board of address “0” may be abnormal.
1 Replace remote controller.
2 Abnormal if the clock function of remote
controller cannot be normally operated.
(Error code: E2)
1 Set a remote controller to main, and the
1 2 remote controller are set as
other to sub.
“main.”
(In case of 2 remote controllers)
2 Remote controller is connected 2 Remote controller is connected with only one
with 2 indoor units or more.
indoor unit.
3 Repetition of refrigerant
3 The address changes to a separate setting.
address
4 Defective transmitting receiving 4~6 Diagnose remote controller.
circuit of remote controller
a) When “RC OK” is displayed, remote controllers have no problem.
1 Abnormal if indoor controller board could 5 Defective transmitting receiving
Turn the power off, and on again to check.
not find blank of transmission path.
circuit of indoor controller board
When becoming abnormal again, replace
(Error code: E5)
6 Noise has entered into transindoor controller board.
2 Indoor controller board receives transmission wire of remote controlb) When “RC NG”is displayed, replace
mitted data at the same time, compares
ler.
remote controller.
the data, and when detecting it, judges
c) When “RC E3”or “ERC 00-66”is displayed,
different data to be abnormal 30
noise may be causing abnormality.
continuous times. (Error code: E5)
Remote controller transmission error (E3)/
signal receiving error (E5)
1 Abnormal if remote controller could not
find blank of transmission path for 6 seconds and could not transmit.
(Error code: E3)
2 Remote controller receives transmitted
data at the same time, compares the
data, and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E3)
OCH512
32
Abnormal point and detection method
Error Code
E6
(6840)
E8
(6840)
E9
(6841)
EF
(6607
or
6608)
Case
Judgment and action
Indoor/outdoor unit communication
error (Signal receiving error)
1 Abnormal if indoor controller board could
not receive any signal normally for 6
minutes after turning the power on.
2 Abnormal if indoor controller board could
not receive any signal normally for 3
minutes.
3 Consider the unit as abnormal under
the following condition; When 2 or more
indoor units are connected to an outdoor
unit, indoor controller board could not
receive a signal for 3 minutes from
outdoor controller circuit board, a signal
which allows outdoor controller circuit
board to transmit signals.
w Check LED display on outdoor controller
circuit board. (Connect A-Control service tool
(PAC-SG50ST))
1 Contact failure, short circuit or
Refer to EA~EC item if LED displays EA~AC.
miswiring (converse wiring) of
indoor/outdoor unit connecting 1 Check disconnecting or looseness of indoor
/outdoor unit connecting wire of indoor unit
wire
or outdoor unit.
2 Defective transmitting receiving
Check all the units in case of twin indoor unit
circuit of outdoor controller
system.
circuit board
3 Defective transmitting receiving 2~4 Turn the power off, and on again to check.
If abnormality generates again, replace
circuit of indoor controller board
indoor controller board or outdoor controller
4 Noise has entered into indoor/
circuit board.
outdoor unit connecting wire.
5 Turn the power off, and detach fan motor from
5 Defective fan motor
connector (CNF1,2). Then turn the power on again.
6 Defective rush current resistor
If abnormality is not displayed, replace fan motor.
If abnormality is displayed, replace outdoor
controller circuit board.
6 Check RS1 on outdoor noise filter board with
tester. If open is detected, replace the board.
w Other indoor controller board may have
defect in case of twin indoor unit system.
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
(1) Abnormal if outdoor controller circuit
board could not receive anything
normally for 3 minutes.
1 Check disconnection or looseness of indoor/
1 Contact failure of indoor/
outdoor unit connecting wire of indoor or
outdoor unit connecting wire
outdoor units.
2 Defective communication circuit
of outdoor controller circuit board 2~4 Turn the power off, and on again to
check. Replace indoor controller board
3 Defective communication circuit
or outdoor controller circuit board if
of indoor controller board
abnormality is displayed again.
4 Noise has entered into indoor/
outdoor unit connecting wire.
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
(1) Abnormal if “0” receiving is detected
30 times continuously though outdoor
controller circuit board has transmitted “1”.
(2) Abnormal if outdoor controller circuit
board could not find blank of transmission
path for 3 minutes.
1 Indoor/outdoor unit connecting 1 Check disconnection or looseness of indoor/
wire has contact failure.
outdoor unit connecting wire.
2 Defective communication circuit 2~4 Turn the power off, and on again to
of outdoor controller circuit board
check. Replace outdoor controller circuit
3 Noise has entered power supply.
board if abnormality is displayed again.
4 Noise has entered indoor/
outdoor unit connecting wire.
Non defined error code
This code is displayed when non defined
error code is received.
1 Noise has entered transmission 12 Turn the power off, and on again to check.
Replace indoor controller board or outdoor
wire of remote controller.
controller circuit board if abnormality is
2 Noise has entered indoor/
displayed again.
outdoor unit connecting wire.
3 Replace outdoor unit with power-inverter type
3 Outdoor unit is not a poweroutdoor unit.
inverter models.
4 Replace remote controller with MA remote
4 Model name of remote
controller.
controller is PAR-S25A.
Serial communication error
1. Abnormal if serial communication
between outdoor controller circuit board
and outdoor power circuit board is
defective.
1 Breaking of wire or contact
12 Check connection of each connector CN2
and CN4 between the outdoor controller
failure of connector CN2
between the outdoor controller
circuit board and the outdoor power circuit
board.
circuit board and the outdoor
power circuit board
2 Breaking of wire or contact
failure of connector CN4
between the outdoor controller
circuit board and the outdoor
power circuit board
3 Defective communication circuit 3 Replace outdoor power circuit board.
of outdoor power circuit board
4 Defective communication circuit 4 Replace outdoor controller circuit board.
of outdoor controller circuit board
for outdoor power circuit board
2. Abnormal if communication between
outdoor controller circuit board and
M-NET board is not available.
1 Check disconnection, looseness, or breaking
1 Breaking of wire or contact
of connection wire between outdoor controller
failure of connector between
circuit board (CNMNT) and M-NET board
outdoor controller circuit board
(CN5).
and M-NET board
2 Contact failure of M-NET board 2 Check disconnection, looseness, or breaking
of connection wire between outdoor controller
power supply line
circuit board (CNMNT) and M-NET board
3 Noise has entered into M-NET
(CND).
transmission wire.
3 Check M-NET transmission wiring method.
Ed
(0403)
OCH512
33
Error Code
Abnormal point and detection method
Pipe temperature
1 Slight temperature difference
<Cooling mode>
between indoor room
Detected as abnormal when the pipe
temperature and pipe <liquid
temperature is not in the cooling range
or condenser/evaporator>
3 minutes after compressor start and
temperature thermistor
6 minutes after the liquid or condenser/
• Shortage of refrigerant
evaporator pipe is out of cooling range.
• Disconnected holder of
Note 1) It takes at least 9 min. to detect.
pipe <liquid or condenser/
Note 2) Abnormality P8 is not detected in
evaporator> thermistor
drying mode.
• Defective refrigerant circuit
Cooling range : Indoor pipe temperature
2 Converse connection of
(TH2 or TH5) – intake temperature
extension pipe (on plural units
(TH1) [ -3 deg [-5.4˚F]
connection)
TH: Lower temperature between liquid pipe 3 Converse wiring of indoor/
temperature and condenser/evaporator
outdoor unit connecting wire
temperature
(on plural units connection)
4 Defective detection of indoor
<Heating mode>
room temperature and pipe
When 10 seconds have passed after the
<condenser/evaporator>
compressor starts operation and the hot
temperature thermistor
adjustment mode has finished, the unit is
5 Stop valve is not opened
detected as abnormal when condenser/
completely.
evaporator pipe temperature is not in
heating range within 20 minutes.
P8
Note 3) It takes at least 27 minutes to
detect abnormality.
Note 4) It excludes the period of defrosting
(Detection restarts when defrosting
mode is over)
Heating range : 3 deg [5.4˚F] [ (Condenser/
Evaporator temperature (TH5) –
intake temperature (TH1))
<M-NET communication error>
Error Code
A0
(6600)
A2
(6602)
A3
(6603)
1~4
(
Check pipe <liquid or condenser/
evaporator> temperature with room
temperature display on remote
controller and outdoor controller circuit
board.
Pipe <liquid or condenser/evaporator>
temperature display is indicated by
setting SW2 of outdoor controller circuit
board as follows.
Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool (PAC-SK52ST)’.
)
Temperature display of indoor liquid pipe
Indoor 1
1
2
3
4
5
6
Temperature display of indoor condenser/
evaporator pipe Indoor 1
1
2
3
4
5
6
ON
ON
OFF
OFF
Temperature display of indoor liquid pipe
Indoor 2
1
2
3
4
5
6
Temperature display of indoor condenser/
evaporator pipe Indoor 2
1
2
3
4
5
6
ON
ON
OFF
OFF
A-Control Service Tool
SW2 setting
23Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
(Note) “Indoor unit” in the text indicates M-NET board in outdoor unit.
Abnormal point and detection method
Case
Address duplicate definition
1 There are 2 or more same
This error is displayed when transmission
address of controller of outfrom the units of same address is detected.
door unit, indoor unit, FRESH
Note) The address and attribute displayed
MASTER, or LOSSNAY.
at remote controller indicate the con- 2 Noise has entered into transtroller that detected abnormality.
mission signal and signal was
transformed.
Hardware error of transmission
processor
Transmission processor intended to transmit “0”, but “1” appeared on transmission
wire.
Note) The address and attribute display at
remote controller indicate the controller that detected abnormality.
Judgment and action
Case
1 Error is detected if waveform is
Judgment and action
Search the unit with same address as abnormality occurred. If the same address is found, turn off
the power supply of outdoor unit and indoor unit
and FRESH MASTER or LOSSNAY at the same
time for 2 minutes or more after the address is
corrected, and turn the power on again.
Check transmission waveform or noise on
transmission wire.
1 If the works of transmission wire is done
with the power on, turn off the power supply
of outdoor unit and indoor unit and FRESH
MASTER or LOSSNAY at the same time for
2 minutes or more, and turn the power on
again.
transformed when wiring works of
transmission wire of outdoor unit,
indoor unit, FRESH MASTER or
LOSSNAY are done, or polarity is
changed with the power on and
transmission data collide each other.
2 Check transmission waveform or noise on
2 Defective transmitting receiving
circuit of transmission processor
transmission wire.
3 Transmission data is changed by
the noise on transmission.
BUS BUSY
1 Transmission processor could
1 Check if transmission wire of indoor unit,
not transmit signal because short
1. Overtime error by collision damage
FRESH MASTER, LOSSNAY, or remote concycle voltage of noise and the
Abnormal if transmitting signal is not
troller is not connected to terminal block for
like have entered into transmispossible for 8-10 minutes continuously
central control (TB7) of outdoor unit.
sion wire continuously.
because of collision of transmission.
2 Check if transmission wire of indoor unit,
2. Data could not reach transmission wire 2 Transmission quantity has
FRESH MASTER or LOSSNAY is not conincreased and transmission is
for 8-10 minutes continuously because
nected to terminal block for transmission wire
not possible because there was
of noise or etc.
of outdoor unit.
wiring mistake of terminal block
Note) The address and attribute displayed
for transmission wire (TB3) and
at remote controller indicate the conterminal block for central control
troller that detected abnormality.
(TB7) in outdoor unit.
3 Transmission are mixed with
others and occupation rate on
transmission wire rose because
of defective repeater (a function
to connector or disconnect transmission of control and central
control system) of outdoor unit,
then abnormality is detected.
OCH512
34
3 Check if terminal block for transmission wire
(TB3) and terminal block for central control
(TB7) are not connected.
4 Check transmission waveform or noise on
transmission wire.
Error Code
Abnormal point and detection method
Case
Judgment and action
A6
(6606)
Communication error with communication processor
Defective communication between unit
processor and transmission processor
Note) The address and attribute display at
remote controller indicate the controller that detected abnormality.
1 Data of transmission processor or unit processor is not
transmitted normally because
of accidental trouble such as
noise or lightning surge.
2 Address forwarding from unit
processor is not transmitted
normally because of defective
transmission processor hardware.
Turn off the power supply of outdoor unit and
indoor unit and FRESH MASTER or LOSSNAY
at the same time for 2 minutes or more, and
turn the power on again. System returns to
normal if abnormality was accidental malfunction. If the same abnormality generates again,
abnormality-generated controller may be defective.
NO ACK signal
1. Transmitting side controller detects
abnormal if a massage was transmitted
but there is no reply (ACK) that a message was received. Transmitting side
detects abnormality every 30 seconds, 6
times continuously.
Note) The address and attribute displayed
at remote controller is indicate the
controller that did not reply (ACK).
Common factor that has no relation with abnormality source.
1 The unit of former address
does not exist as address
switch has changed while the
unit was energized.
2 Extinction of transmission wire
voltage and signal is caused by
over-range transmission wire.
• Maximum distance ······ 200m
[656ft]
• Remote controller line .. (12m
[39ft])
3 Extinction of transmission wire
voltage and signal is caused by
type-unmatched transmission
wire.
Type······
With shield wireCVVS, CPEVS
With normal wire (no shield)VCTF, VCTFK, CVV
CVS, VVR, VVF, VCT
Diameter ····1.25mm2 [AWG16]
or more
4 Extinction of transmission wire
voltage and signal is caused
by over-numbered units.
5 Accidental malfunction of
abnormality-detected controller
(noise, lightning surge)
6 Defective of abnormality generated controller
Always try the followings when the error
“A7” occurs.
A7
(6607)
1 Turn off the power supply of outdoor unit
and indoor unit and FRESH MASTER or
LOSSNAY at the same time for 2 minutes or
more, and turn the power on again. If malfunction was accidental, the unit returns to
normal.
2 Check address switch of abnormality generated address.
3 Check disconnection or looseness of abnormality generated or abnormality detected
transmission wire (terminal block and connector)
4 Check if tolerance range of transmission wire
is not exceeded.
5 Check if type of transmission wire is correct
or not.
If there were some troubles of 1-5 above,
repair the defective, then turn off the power
supply of outdoor unit and indoor unit and
FRESH MASTER or LOSSNAY at the same
time for 2 minutes or more, and turn the power
on again.
• If there was no trouble with 1-5 above in
single refrigerant system (one outdoor unit),
controller of displayed address or attribute is
defective.
• If there was no trouble with 1-5 above in different refrigerant system (2 or more outdoor
units), judge with 6.
2. If displayed address or attribute is out1 Contact failure of transmission 6 If address of abnormality source is the
address that should not exist, there is the
wire of outdoor unit or indoor
door unit, Indoor unit detects abnormality
unit that memorizes nonexistent address
unit
when indoor unit transmitted to outdoor
information. Delete useless address informa2 Disconnection of transmission
unit and there was no reply (ACK).
tion with manual setting function of remote
connector (CN2M) of outdoor
controller.
unit
Only the system FRESH MASTER or
3 Defective transmitting receiving
LOSSNAY are connected to, or the system
circuit of outdoor unit or indoor
that is equipped with group setting of differunit
ent refrigerant system.
3. If displayed address or attribute is indoor 1 During group operation with
indoor unit of multi- refrigerant
unit, remote controller detects abnormalsystem, if remote controller
ity when remote controller transmitted to
transmit to indoor unit while
indoor unit and there was no reply (ACK).
outdoor unit power supply
of one refrigerant system is
turned off or within 2 minutes of restart, abnormality is
detected.
2 Contact failure of transmission
wire of remote controller or
indoor unit
3 Disconnection of transmission
connector (CN2M) of indoor
unit
4 Defective transmitting receiving
circuit of indoor unit or remote
controller
OCH512
If there was no trouble with 1-6 above, replace
the controller board of displayed address or
attribute.
If the unit does not return to normal, multi-controller board of outdoor unit may be defective
(repeater circuit).
Replace multi-controller board one by one to
check if the unit returns to normal.
Continued to the next page.
35
From the previous page.
Error Code
Abnormal point and detection method
Case
4. If displayed address or attribute is
1 During group operation with
indoor unit of multi- refrigerant
remote controller,
system, if indoor unit transmit
Indoor unit detects abnormality when
to remote controller while outindoor unit transmitted to remote controldoor unit power supply of one
ler and there was no reply (ACK).
refrigerant system is turned off
or within 2 minutes of restart,
abnormality is detected.
2 Contact failure of transmission
wire of remote controller or
indoor unit
3 Disconnection of transmission
connector (CN2M) of indoor
unit
4 Defective transmitting receiving
circuit of indoor unit or remote
controller
5. If displayed address or attribute is
1 During sequential operation
of indoor unit and FRESH
FRESH MASTER,
MASTER of other refrigerant
Indoor unit detects abnormality when
system, if indoor unit transmits
indoor unit transmitted to FRESH
to FRESH MASTER while
MASTER and there was no reply (ACK).
outdoor unit power supply of
same refrigerant system with
FRESH MASTER is turned off
or within 2 minutes of restart,
abnormality is detected.
2 Contact failure of transmission
wire of indoor unit or FRESH
MASTER
3 Disconnection of transmission
connector (CN2M) of indoor
unit or FRESH MASTER
4 Defective transmitting receiving
circuit of indoor unit or FRESH
MASTER
A7
(6607)
6. If displayed address or attribute is
1 If the power supply of
LOSSNAY is turned off, indoor
LOSSNAY,
unit detects abnormality when
Indoor unit detects abnormality when
it transmits to LOSSNAY.
indoor unit transmitted to LOSSNAY and
2 During sequential operation
there was no reply (ACK).
of indoor unit and LOSSNAY
of other refrigerant system,
if indoor unit transmits to
LOSSNAY while outdoor unit
power supply of same refrigerant system with LOSSNAY
is turned off or within 2 minutes of restart, abnormality is
detected.
3 Contact failure of transmission wire of indoor unit of
LOSSNAY
4 Disconnection of transmission
connector (CN2M) of indoor
unit
5 Defective transmitting receiving circuit of indoor unit or
LOSSNAY
7. If displayed address or attribute is nonexistent,
OCH512
1 The unit of former address
does not exist as address
switch has changed while the
unit was energized.
2 Abnormality is detected
when indoor unit transmitted because the address
of FRESH MASTER and
LOSSNAY are changed after
sequential operation of FRESH
MASTER and LOSSNAY by
remote controller.
36
Judgment and action
Same as mentioned in “A7” of the previous
page.
Error Code
A8
(6608)
Abnormal point and detection method
Case
M-NET NO RESPONSE
1 Transmitting condition is
repeated fault because of
Abnormal if a message was transmitted
noise and the like.
and there were reply (ACK) that message
2 Extension of transmission wire
was received, but response command
voltage and signal is caused
does not return. Transmitting side detects
by over-range transmission
abnormality every 30 seconds, 6 times
wire.
continuously.
• Maximum distance ······ 200m
Note) The address and attribute displayed
[656ft]
at remote controller indicate the con• Remote controller line ····(12m
troller that did not reply (ACK).
[39ft])
3 Extension of transmission wire
voltage and signal is caused
by type-unmatched transmission wire.
Type······
With shield wireCVVS, CPEVS
With normal wire (no shield)VCTF, VCTFK, CVV
CVS, VVR, VVF, VCT
Diameter ····1.25mm2 [AWG16]
or more
4 Accidental malfunction of
abnormality-generated
controller
Judgment and action
1 Check transmission waveform or noise on
transmission wire.
2 Turn off the power supply of outdoor unit
and indoor unit and FRESH MASTER or
LOSSNAY at the same time for 2 minutes or
more, and turn the power on again. If malfunction was accidental, the unit returns to
normal. If the same abnormality generates
again, controller of displayed address and
attribute may be defective.
10-5. TROUBLESHOOTING BY INFERIOR PHENOMENA
Phenomena
1. Remote controller display does not
work.
Factor
1DC12V is not supplied to remote controller.
(Power supply display
is not indicated on LCD.)
2DC12~15V is supplied to remote controller, however,
no display is indicated.
• “PLEASE WAIT” is not displayed.
• “PLEASE WAIT” is displayed.
Countermeasure
1Check LED2 on indoor controller board.
(1) When LED2 is lit.
Check the remote controller wiring for
breaking or contact failure.
(2) When LED2 is blinking.
Check short circuit of remote controller
wiring.
(3) When LED2 is not lit.
Refer to phenomena No.3 below.
2Check the following.
• Failure of remote controller if “PLEASE
WAIT” is not displayed
• Refer to phenomena No.2 below if
“PLEASE WAIT” is displayed.
2. “PLEASE WAIT” display is remained 1At longest 2 minutes after the power supply “PLEASE 1Normal operation
on the remote controller.
WAIT” is displayed to start up.
2Self-diagnosis of remote controller
3”PLEASE WAIT” is displayed for 6 min2Communication error between the remote controller
utes at most in case of indoor/outdoor unit
and indoor unit
communication error. Check LED3 on
3Communication error between the indoor and outdoor
indoor controller board.
unit
(1)When LED3 is not blinking.
4Outdoor unit protection device connector is open.
Check indoor/outdoor connecting wire
for miswiring.
(Converse wiring of S1 and S2, or
break of S3 wiring.)
(2)When LED3 is blinking.
Indoor/outdoor connecting wire is normal.
4Check LED display on outdoor controller
circuit board. Refer to 10-10.
Check protection device connector (63L
and 63H) for contact failure.
Refer to 10-9.
3. When pressing the remote controller 1After cancelling to select function from the remote
operation switch the OPERATION
controller, the remote controller operation switch will
display is appeared but it will be
not be accepted for approx. 30 seconds.
turned off soon.
OCH512
37
1Normal operation
Phenomena
4. Even controlling by the IR wireless
remote controller no beep is heard
and the unit does not start operating. Operation display is indicated
on IR wireless remote controller.
Factor
Countermeasure
1The pair number settings of the IR wireless remote
1Check the pair number settings.
controller and indoor controller board are mismatched.
5. When operating by the IR wireless
remote controller, beep sound is
heard, however, unit does not start
operating.
1No operation for 2 minutes at most after the power
1Normal operation
supply ON.
2Hand-held remote controller operation is prohibited.
2Normal operation
• Remote controlling adaptor is connected to CN32
on the indoor controller board.
• Hand-held remote controller operation is prohibited
by centralised controller etc. since it is connected to
MELANS.
3Refer to factor of phenomena No.2 on previous page. 3Check the details of phenomena No.2 on
previous page.
1 If refrigerant leaks, discharging temperature rises and LEV opening increases.
Inspect leakage by checking the temperature and opening.
Check pipe connections for gas leakage.
2 Open intake grille and check the filter.
Clean the filter by removing dirt or dust
on it.
3 If the filter is clogged, indoor pipe temperature rises and discharging pressure
increases. Check if heat exchanger is
clogged by inspecting discharging pressure.
Clean the heat exchanger.
4 Remove the blockage.
6. Remote controller display works
1Refrigerant shortage
normally and the unit performs cooling operation, however, the capacity
cannot be fully obtained. (The air
does not cool well.)
2Filter clogging
3Heat exchanger clogging
4Air duct short cycle
7. Remote controller display works
1Linear expansion valve fault
1 Discharging temperature and indoor heat
normally and the unit performs heatOpening cannot be adjusted well due to linear expanexchanger temperature does not rise.
ing operation, however, the capacity
sion valve fault.
Inspect the failure by checking discharging
cannot be fully obtained.
pressure.
Replace linear expansion valve.
2Refrigerant shortage
2 If refrigerant leaks, discharging temperature rises and LEV opening increases.
Inspect leakage by checking the temperature and opening.
Check pipe connections for gas leakage.
3 Check the insulation.
3Lack of insulation for refrigerant piping
4 Open intake grill and check the filter. Clean
4Filter clogging
the filter by removing dirt or dust on it.
5 If the filter is clogged, indoor pipe temperature rises and discharging pressure
5Heat exchanger clogging
increases. Check if heat exchanger is
clogged by inspecting discharging pressure.
Clean the heat exchanger.
6 Remove the blockage.
6Air duct short cycle
7 Check refrigerant system during operation.
7Bypass circuit of outdoor unit fault
12Normal operation
8. 1For 3 minutes after temperature
(For protection of compressor)
adjuster turns off, the compressor
will not start operating even if
temperature adjuster is turned on.
2For 3 minutes after temperature
adjuster turns on, the compressor
will not stop operating even if
temperature adjuster is turned off.
(Compressor stops operating
immediately when turning off by
the remote controller.)
OCH512
38
12Normal operation
Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller.
Diagnosis flow
Cause
Inspection method and
troubleshooting
Check the display time of “PLEASE WAIT”
after turning on the main power.
6 minutes
or more
How long is “PLEASE WAIT”
kept being displayed on the
remote controller?
2 minutes
or less
2 to 6
minutes
Are any error codes
displayed on the
remote controller?
Check the LED display of the
outdoor controller circuit board.
Are any error codes
displayed on the LED?
• “PLEASE WAIT”
• Normal
will be displayed
The start-up diagnosis will
during the start-up
be over in around 2 minutes.
diagnosis after turning
on the main power.
NO
YES
YES
• Miswiring of indoor/
outdoor connecting
wire
• Breaking of indoor/
outdoor connecting
wire (S3)
• Defective indoor
controller board
• Defective outdoor
controller circuit
board
NO
• Defective indoor
controller board
• Defective remote
controller
OCH512
39
• Refer to “Self-diagnosis
action table” in order to
solve the trouble.
• In case of communication
errors, the display of
remote controller may not
match the LED display of
the outdoor unit.
Symptoms: Nothing is displayed on the remote controller Diagnosis flow
Cause
LED display of the indoor
controller board
LED1 :
LED2 :
LED3 :
Inspection method and
troubleshooting
Check the voltage between S1
and S2 on the terminal block
(TB4) of the indoor unit.
AC 187V to AC 253V?
YES
NO
Check the voltage among L1 and L2
on the terminal block (TB1) of the
outdoor power circuit board.
AC 187V to AC 253V?
NO
• Troubles concerning
power supply
• Check the power wiring
to the outdoor unit.
• Check the breaker.
• Bad wiring of the
outdoor controller
board
• The fuses on the
outdoor
controller circuit
board are blown.
• Check the wiring of the
outdoor unit.
• Check if the wiring is bad.
Check if the fuses are blown.
The fuses on the outdoor
controller circuit board will
be blown when the indoor
/outdoor connecting wire
short-circuits.
• Bad wiring of the
outdoor controller
board
• The fuses on the
outdoor
controller circuit
board are blown.
• Check if miswiring, breaking
or poor contact is causing this
problem. Indoor/outdoor
connecting wire is polarized
3-core type. Connect the
indoor unit and the outdoor
unit by wiring each pair of
S1, S2 and S3 on the both
side of indoor/outdoor
terminal blocks.
• Defective indoor
controller board
• Replace the indoor
controller board.
YES
Check the voltage between S1
and S2 on the terminal block
(TB1) of the outdoor unit which
is used to connect the indoor
unit and the outdoor unit.
AC 187V to AC 253V?
NO
YES
Check the voltage of indoor
controller board (CN2D).
DC 12V to DC 16V?
YES
NO
Check the voltage of the unit after
removing the indoor power board
(CN2S).
DC 12V to DC 16V?
YES
• Miswiring, breaking
• Check if there is miswiring
or poor connection of or breaking of wire.
indoor/outdoor
connecting wire
NO
• Defective indoor
power board
OCH512
40
• Replace the indoor
power board.
Symptoms: Nothing is displayed on the remote controller Diagnosis flow
Cause
LED display of the indoor
controller board
LED1 :
LED2 :
LED3 :
or
Inspection method and
troubleshooting
Check the voltage between S1 and S2 on the terminal block (TB4)
of the indoor unit.
NO
AC 187V to AC 253V?
YES
Not lighting.
Check the status
of the indoor controller
board LED3 display.
Check the looseness or disconnection
of the indoor/outdoor connecting wire.
Blinking
Are there looseness or
disconnection of the indoor/
outdoor connecting wire?
YES
NO
• Breaking or poor
• Fix the breaking or poor
contact of the indoor/ contact of the indoor/outdoor
outdoor connecting
connecting wire.
wire
Check the refrigerant address of
the outdoor unit. (SW1-3 to 1-6)
NO
Is the refrigerant
address “0”?
YES
Check the LED display of the
outdoor unit after turning on the
main power again.
Not displayed.
Is anything displayed?
Displayed.
Is “EA” or “Eb”
displayed?
• Normal
Only the unit which
has the refrigerant
address “0” supplies
power to the remote
controller.
• Set the refrigerant
address to “0”. In case of
the multiple grouping
system, recheck the
refrigerant address again.
• Defective outdoor
controller circuit
board
• Replace the outdoor
controller circuit board.
• Defective outdoor
controller circuit
board
• Replace the outdoor
controller circuit board.
• Defective indoor
controller board
• Replace the indoor controller
board of the indoor unit which
does not operate.
NO
YES
Is “E8” displayed?
YES
NO
Can the unit be restarted?
Can all the indoor
unit be operated?
Check the voltage between S2
and S3 on the terminal block of
the outdoor unit.
DC 17V to DC 28V?
YES
• Influence of
• Not abnormal.
electromagnetic noise There may be the influence
of electromagnetic noise.
Check the transmission wire
and get rid of the causes.
NO
YES
OCH512
NO
41
• Defective outdoor
power circuit board
• Replace the outdoor
power circuit board.
• Defective indoor
power board
• Replace the indoor
power board.
Symptoms: Nothing is displayed on the remote controller Diagnosis flow
Cause
LED display of the indoor
controller board
LED1 :
LED2 :
or
LED3 : —
Inspection method and
troubleshooting
Check the voltage of the
terminal block (TB6) of
the remote controller.
DC 10V to DC 16V?
YES
• Defective
remote controller
• Replace the
remote controller.
NO
Check the status
of the LED2.
Lighting
• Breaking or poor
• Check if there is breaking
contact of the remote or poor contact of the
controller wire
remote controller wire.
Check the voltage of the
terminal block (TB5)
connecting the remote
controller wire.
If it is not between DC 10V
and DC16V, the indoor
controller board must be
defective.
Blinking
Check the status of the LED2
after disconnecting the remote
controller wire from the terminal
block (TB5) of the indoor unit.
Check the status
of the LED2.
Lighting
• The remote controller • Check if the remote
wire short-circuits
controller wire is
short-circuited.
Blinking
• Defective indoor
controller board
OCH512
42
• Replace the indoor
controller board.
• Before repair
Frequent calling from customers
Phone Calls From Customers
How to Respond
Note
Unit does The operating display of remote Check if power is supplied to air conditioner.
not operate
controller does not come on.
Nothing appears on the display unless power is
at all.
supplied.
Unit cannot be restarted for a Wait around 3 minutes to restart unit.
while after it’s stopped.
The air conditioner is in a state of being protected
by the microprocessor’s directive. Once the
compressor is stopped, the unit cannot be
restarted for 3 minutes. This control is also applied
when the unit is turned on and off by remote
controller or thermostat.
Error code appears and blinks Error code will be displayed if any protection
on the display of remote
devices of the air conditioner are actuated.
controller.
What is error code?
Remote
controller
“PLEASE WAIT” is displayed
on the screen.
Wait around 2 minutes.
An automatic startup test will be conducted for
2 minutes when power is supplied to the air
conditioner. “PLEASE WAIT” will be kept being
displayed while that time.
“FILTER” is displayed on the
screen.
This indicates that it is time to clean the air filters.
Clean the air filters. Press the FILTER button on
the remote controller twice to clear “FILTER” from
the display.
See the operation manual that came with the
product for how to clean the filters.
“STANDBY” is displayed on the This is displayed when the unit starts HEAT
operation, when the thermostat puts the
screen.
compressor in operation mode, or when the
outdoor unit ends DEFROST operation and
returns to HEAT operation.
The display will automatically disappear around
10 minutes later.
While “STANDBY” is displayed on the remote
controller, the airflow amount will be restricted
because the indoor unit’s heat exchanger is not
fully heated up. In addition to that, the up/down
vane will be automatically set to horizontal blow
in order to prevent cold air from directly blowing
out to human body. The up/down vane will return
to the setting specified by the remote controller
when “STANDBY” is released.
“DEFROST” is displayed on
the screen. (No air comes out
of the unit.)
OCH512
The outdoor unit gets frosted when the outside
temperature is low and the humidity is high.
“DEFROST” indicates the DEFROST operation
is being performed to melt this frost. The
DEFROST operation ends in around 10 minutes
(at most 15 minutes).
During the DEFROST operation, the indoor unit’s
heat exchanger becomes cold, so the blower is
stopped. The up/down vane will be automatically
set to horizontal blow in order to prevent cold air
from directly blowing out to human body. The
display will turn into “STANDBY” when DEFROST
operation ends.
43
Refer to “SELF-DIAGNOSIS
ACTION TABLE”.
Check if servicing is
required for the error.
Display time of “FILTER”
depends on the model.
Long life filter: 2500 hrs.
Standard filter: 100 hrs.
Phone Calls From Customers
How to Respond
Note
The room cannot be cooled or heated sufficiently. Check the set temperature of remote controller.
The outdoor unit cannot be operated if the set
temperature is not appropriate.
The outdoor unit operates in the following modes.
COOL: When the set temperature is lower
than the room temperature.
HEAT: When the set temperature is higher
than the room temperature.
Check if filters are not dirty and clogged. If filters
are clogged, the airflow amount will be reduced
and the unit capacity will be lowered. See the
instruction manual that came with the product for
how to clean the filters.
Sound
A gas escaping sound is heard
comes out
sometimes.
from the air
conditioner.
A cracking sound is heard
sometimes.
Check there is enough space around the air
conditioner.
If there are any obstacles in the air intake or air outlet
of indoor/outdoor units, they block the airflow
direction so that the unit capacity will be lowered.
This is not a malfunction.
This is the sound which is heard when the flow of
refrigerant in the air conditioner is switched.
This is not a malfunction.
This is the sound which is heard when internal
parts of units expand or contract when the
temperature changes.
A buzzing sound is heard
sometimes.
This is not a malfunction.
This is the sound which is heard when the outdoor
unit starts operating.
A ticking sound is heard from
the outdoor unit sometimes.
This is not a malfunction.
This is the sound which is heard when the fan
of the outdoor unit is controlling the airflow amount
in order to keep the optimum operating condition.
A sound, similar to water
flowing, is heard from the unit.
This is not a malfunction.
This is the sound which is heard when the
refrigerant is flowing inside the indoor unit.
Something The fan speed does not match
is wrong
the setting of the remote
with the
controller during DRY
blower…..
operation.(No air comes out
sometimes during DRY
operation.)
This is not a malfunction. During the DRY
operation, the blower’s ON/OFF is controlled by
the microprocessor to prevent overcooling and to
ensure efficient dehumidification. The fan speed
cannot be set by the remote controller during DRY
operation.
The fan speed does not match
the setting of the remote
controller in HEAT operation.
This is not a malfunction.
1) When the HEAT operation starts, to prevent the
unit from blowing cold air, the fan speed is
gradually increased from 0 to the set speed,
in proportion to the temperature rise of the
discharged air.
2) When the room temperature reaches the set
temperature and the outdoor unit stops,
the unit starts the LOW AIR operation.
3) During the HEAT operation, the DEFROST
operation is performed to defrost the outdoor
unit. During the DEFROST operation, the
fan is stopped to prevent cold air coming
out of the indoor unit.
OCH512
44
The up/down vane will be
automatically set to
horizontal blow in these
cases listed up on the left
(1)~3)). After a while, the
up/down vane will be
automatically moved
according to the setting of
the remote controller.
Phone Calls From Customers
Something Air blows out for a while after
is wrong
HEAT operation is stopped.
with the
blower…..
How to Respond
Note
This is not a malfunction.
The blower is operating just for cooling down the
heated-up air conditioner. This will be done within
1 minute.
This control is conducted only when the HEAT
operation is stopped with the electric heater ON.
However, this control is also
applied to the models which
has no electric heater.
Something The airflow direction is changed If the up/down vane is set to downward in COOL
is wrong
during COOL operation.
operation, it will be automatically set to horizontal
with the
blow by the microprocessor in order to prevent
airflow
water from dropping down.
direction….
“1 Hr.” will be displayed on the remote controller if
the up/down vane is set to downward with the fan
speed set to be less than “LOW”.
The airflow direction is changed In HEAT operation, the up/down vane is
during HEAT operation.
automatically controlled according to the
temperature of the indoor unit’s heat exchanger.
(The airflow direction cannot be
In the following cases written below, the up/down
set by remote controller.)
vane will be set to horizontal blow, and the setting
cannot be changed by remote controller.
1) At the beginning of the HEAT operation
2) While the outdoor unit is being stopped by
thermostat or when the outdoor unit gets started
to operate.
3) During DEFROST operation
The airflow direction will be back to the setting
of remote controller when the above situations
are released.
“STANDBY” will be displayed
on the remote controller in
case of 1) and 2).
“DEFROST” will be displayed
on the screen in case of 3).
The airflow direction does not
1) Check if the vane is set to a fixed position.
change.
(Check if the vane motor connector is
removed.)
(Up/down vane, left/right louver)
2) Check if the air conditioner has a function for
switching the air direction.
3) If the air conditioner doesn’t have that
function, “NOT AVAILABLE” will be displayed
on the remote controller when “AIR
DIRECTION” or “LOUVER” button is pressed.
The air conditioner starts operating even though Check if you set ON/OFF timer.
any buttons on the remote controller are not
The air conditioner starts operating at the time
pressed.
designated if ON timer has been set before.
Check if any operations are ordered by distant
control system or the central remote controller.
While “CENTRALLY CONTROLLED INDICATOR”
is displayed on the remote controller, the air
conditioner is under the control of external directive.
There might be a case that
“CENTRALLY CONTROLLED
INDICATOR” will not be
displayed.
Check if power is recovered from power failure
(black out).
The units will automatically start operating when
power is recovered after power failure (black out)
occurs. This function is called “auto recovery
feature from power ”.
The air conditioner stops even though any
Check if you set ON/OFF timer.
buttons on the remote controller are not pressed.
The air conditioner stops operating at the time
designated if OFF timer has been set before.
Check if any operations are ordered by distant
control system or the central remote controller.
While “CENTRALLY CONTROLLED INDICATOR” is
displayed on the remote controller, the air conditioner is
under the control of external directive.
OCH512
45
There might be a case that
“CENTRALLY
CONTROLLED INDICATOR”
will not be displayed.
Phone Calls From Customers
How to Respond
A white mist is expelled from the indoor unit.
This is not a malfunction.
This may occur when the operation gets started in
the room of high humidity.
Water or moisture is expelled from the outdoor
unt.
Cooling: when pipes or piping joints are cooled, they
get sweated and water drips down.
Heating: water drips down from the heat exchanger.
* Use optional parts “Drain Socket” and “Drain pan”
if these water needs to be collected and drained out
for once.
The display of IR wireless remote controller gets Batteries are being exhausted. Replace them and
dim or does not come on.
press the reset button of remote controller.
The indoor unit does not receive a signal from
remote controller at a long distance.
OCH512
46
Note
10-6. HOW TO CHECK THE PARTS
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
Check points
Parts name
Thermistor (TH3)
<Outdoor pipe>
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 10~30, 50°F~86°F)
Thermistor (TH6)
<Outdoor 2-phase pipe>
Thermistor (TH7)
<Outdoor>
Thermistor (TH8)
<Heatsink>
Thermistor (TH32)
<Shell>
Normal
TH32
Abnormal
160k~410k
TH3
TH6
4.3k~9.6k
Open or short
TH7
TH8
39k~105k
Fan motor (MF1,MF2) Refer to next page.
Solenoid valve coil
<Four-way valve>
(21S4)
Measure the resistance between the terminals with a tester.
(At the ambient temperature 20, 68°F)
Normal
Abnormal
A42
Open or short
2350$170
Motor for compressor Measure the resistance between the terminals with a tester.
(Winding temperature 20, 68°F)
U
(MC)
Normal
V
A42
W
0.302
Abnormal
Open or short
Linear expansion valve Disconnect the connector then measure the resistance with a tester.
(Winding temperature 20, 68°F)
(LEV-A)
M
Gray
Orange
Red
Yellow
Black
OCH512
1
2
3
4
5
6
Normal
Gray - Black
Gray - Yellow
Gray - Red
46$3
47
Abnormal
Gray - Orange
Open or short
Check method of DC fan motor (fan motor/outdoor controller circuit board)
Notes
· High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNF1, 2) for the motor with the power supply on.
(It causes trouble of the outdoor controller circuit board and fan motor.)
Self check
Symptom : The outdoor fan cannot turn around.
Fuse check
Check the fuse (F5) on outdoor
controller board.
Did the fuse blow?
Yes
Replace outdoor controller board (C.B)
and fan motor (MF1, 2).
No
Wiring contact check
Contact of fan motor connector (CNF1, 2)
Is there contact failure?
Yes
Wiring recovery
No
Power supply check (Remove the connector (CNF1, 2))
Measure the voltage in the outdoor controller circuit board.
TEST POINT : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC250-330V
TEST POINT : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V
Is the voltage normal?
Yes
Yes
No
Check the operation of fan.
Replace outdoor
controller board.
NG
Replace outdoor controller board.
OK
Check the operation.
Replace the fan motor.
END
NG
Replace the fan motor.
OCH512
48
OK
END
10-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
50
Low temperature thermistors
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Outdoor 2-phase pipe> (TH6)
• Thermistor <Outdoor> (TH7)
Resistance (k)
40
Thermistor R0 = 15k" ± 3%
B constant = 3480 ± 2%
1
1
t (:): Rt =15exp{3480( 273+t – 273 )}
1
1
T (˚F): RT =15exp{3480( 273+(T– 32)/1.8 – 273 )}
30
20
10
0:[32˚F]
10:[50˚F]
20:[68˚F]
25:[77˚F]
15k"
9.6k"
6.3k"
5.2k"
30:[86˚F]
40:[104˚F]
4.3k"
3.0k"
0
Medium temperature thermistor
-20 -10 0 10 20 30 40 50 -4 -14 32 50 68 86 104122 °F
Temperature
200
• Thermistor <Heatsink> (TH8)
Thermistor R50 = 17k" ± 2%
B constant = 4170 ± 3%
150
0:[32˚F]
25:[77˚F]
50:[122˚F]
70:[158˚F]
90:[194˚F]
Resistance (k)
1
1
t (:): Rt =17exp{4170( 273+t – 323 )}
1
1
T (˚F): RT=17exp{4170( 273+(T– 32)/1.8 – 323 )}
180k"
50k"
17k"
8k"
4k"
100
50
0
25
77
50
75 100 110 125 122 167 212 230 257 °F
Temperature
500
High temperature thermistor
• Thermistor <Shell> (TH32)
400
Resistance (k)
Thermistor R120 = 7.465k" ± 2%
B constant = 4057 ± 2%
1
1
t (:): Rt =7.465exp{4057( 273+t – 393 )}
1
1
T (˚F): RT =7.465exp{4057( 273+(T– 32)/1.8 – 393 )}
20:[68˚F]
30:[86˚F]
40:[104˚F]
50:[122˚F]
60:[140˚F]
OCH512
250k"
160k"
104k"
70k"
48k"
70:[158˚F]
80:[176˚F]
90:[194˚F]
100:[212˚F]
110:[230˚F]
34k"
24k"
17.5k"
13.0k"
9.8k"
300
200
100
0
49
25
77
50
75
122
167
Temperature
100
212
120 248 °F
Linear expansion valve
(1) Operation summary of the linear expansion valve
• Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the outdoor controller board and the linear expansion valve>
Outdoor controller board
DC12V
Gray
LEV
1
Drive circuit
3
M
2
1
5
4
Orange 3
:4
4
:3
:2
Yellow 5
:2
:1
Black
6
:1
:4
:3
6
Red
Connector LEV-A
<Output pulse signal and the valve operation>
Output
(Phase)
Output
1
2
3
5
4
6
7
8
:1
ON ON OFF OFF OFF OFF OFF ON
:2
OFF ON
:3
OFF OFF OFF ON
:4
OFF OFF OFF OFF OFF ON ON ON
ON ON OFF OFF OFF OFF
ON ON OFF OFF
Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8
Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1
The output pulse shifts in above order.
• When linear expansion valve operation stops, all output phase
become OFF.
• When the switch is turned on, 700 pulse closing valve signal will
be sent till it goes to A point in order to define the valve position.
(The pulse signal is being sent for about 20 seconds.)
(2) Linear expansion valve operation
When the valve moves smoothly, there is no sound or vibration
occurring from the linear expansion valve; however, when the
pulse number moves from B to A or when the valve is locked,
sound can be heard than normal situation.
No sound is heard when the pulse number moves from B to A in
case coil is burn out or motor is locked by open-phase.
Valve position (capacity)
• Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion
valve.
Close
Open
500 pulse
Opening a valve
all the way
Pulse number
Extra tightening (about 32 pulse)
OCH512
50
(4) How to attach and detach the coil of linear expansion valve
<Composition>
Linear expansion valve is separable into the main body and the coil as shown in the diagram below.
Stopper
Main body
Coil
Lead wire
<How to detach the coil>
Hold the lower part of the main body (shown as A) firmly so that
the main body does not move and detach the coil by pulling it
upward.
Be sure to detach the coil holding main body firmly. Otherwise
pipes can bend due to pressure.
A
<How to attach the coil>
Hold the lower part of the main body (shown as A) firmly so that
the main body does not move and attach the coil by inserting it
downward into the main body. Then securely attach the coil stopper to main body. (At this time, be careful that stress is not added
to lead wire and main body is not wound by lead wire.) If the
stopper is not firmly attached to main body, coil may be detached
from the main body and that can cause defective operation of linear expansion valve.
To prevent piping stress, be sure to attach the coil holding the
main body of linear expansion valve firmly. Otherwise pipe may
break.
Be sure to attach
the stopper.
A
OCH512
51
10-8. EMERGENCY OPERATION
(1) When the error codes shown below are displayed on outdoor unit or microprocessor for wired remote controller or indoor
unit has a failure, but no other problems are found, emergency operation will be available by setting the emergency operation switch (SWE) to ON and short-circuiting the connector (CN31) on outdoor controller board.
LWhen following abnormalities occur, emergency operation will be available.
Error code Inspected content
U4
Open/short of pipe thermistor (TH3/TH6)
E8
Indoor/outdoor unit communication error •Signal receiving error (Outdoor unit)
E9
Indoor/outdoor unit communication error •Transmitting error (Indoor unit)
E0 ~ E7
Ed
Communication error other than outdoor unit
Communicaiton error between outdoor controller board and M-NET board (Serial communication error)
(2) Check the following items and cautions for emergency operation
1 Make sure that there is no abnormality in outdoor unit other than the above abnormalities. (Emergency operation will not
be available when error codes other than the above are indicated.)
2 For emergency operation, it is necessary to set the emergency operation switch (SWE) on indoor controller board. Refer
to the electrical wiring diagram of indoor unit for how to set the indoor unit.)
3 During emergency operation, the air-conditioner will continuously be operated by supplying power and stopping it: It can
not be turned on or off by remote control, and temperature control is not possible.
4 Do not perform emergency heating operation for an extended period of time: If the outdoor unit starts defrosting during
this period, cold air will blow out from the indoor unit.
5 Do not perform emergency cooling operation for more than 10 hours: Neglecting this could result in freezing the heat
exchanger in indoor unit.
(3) Emergency operation procedure
1 Turn the main power supply off.
2 Turn on the emergency operation switch (SWE) on indoor controller board.
3 Set the shorting pins of emergency operation connector (CN31) on outdoor controller board to ON.
4 Use SW4-2 on outdoor controller board to set the operation mode (cooling or heating). (SW4-1 is not used.)
CN31
SW4
ON
1
2
Heating
ON
Cooling
OFF
Shorting pins
5 Turning the main power supply on will start the emergency operation.
(4) Releasing emergency operation
1 Turn the main power supply off.
2 Set the emergency operation switch (SWE) on indoor controller board to OFF.
3 Set the shorting pins of emergency operation connector (CN31) on outdoor controller
board to OFF.
4 Set SW4-2 on outdoor controller board as shown in the right.
wIf shorting pins are not set on emergency operation connector (CN31), the setting remains OFF.
OCH512
52
SW4
Heating
(PUZ only)
ON
1
2
Cooling
(5) Operation data during emergency operation
During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation
are set to the following values:
Operation mode
Operation data
Remarks
COOL
HEAT
Intake temperature (TH1)
27:, 81°F
20.5:, 69°F
Indoor fluid pipe temperature (TH2)
5:, 41°F
45:, 113°F
Indoor 2-phase pipe temperature (TH5)
5:, 41°F
50:, 122°F
Set temperature
25:, 77°F
22:, 72°F
Outdoor fluid pipe temperature (TH3)
45:, 113°F
5:, 41°F
(w1)
Outdoor 2-phase pipe temperature (TH6)
50:, 122°F
5:, 41°F
(w1)
Outdoor air temperature (TH7)
35:, 95°F
7:, 45°F
(w1)
5
5
30˚C, 54˚F
30˚C, 54˚F
(w2)
5˚C, 9˚F
5˚C, 9˚F
(w2)
Temperature difference code
(intake temperature - set temperature) (∆Tj)
Discharge super heat (SHd)
Sub-cool (SC)
w1: If the thermistor temperature data is normal (not open/short), that data is loaded into the control as valid data.
When the unit enters emergency operation and TH values are mismatched, set the thermistors to open/short.
And the unit runs emergency operation with the values listed above.
w2: If one thermistor is set to open/short, the values of SHd/SC will be different from the list above.
[Example] When liquid temperature thermistor (TH3) has an open or short circuit.
Thermistor
COOL
HEAT
TH3
45:, 113°F
5:, 41°F
Ta
Tb
TH6
Regard normal figure as effective data.
Tc
Td
TH32
Regard normal figure as effective data.
TH5
5:, 41°F
50:, 122°F
TH2
5:, 41°F
45:, 113°F
Discharge superheat (SHd)
Cooling = TH32 - TH6 = Tc - Ta
Heating = TH32 - TH5 = Td - (50: or 122°F)
Degree of subcooling (SC)
Cooling = TH6 - TH3 = Ta - (45: or 113°F)
Heating = TH5 - TH2 = 50: - 45: = 5 ˚C.
or
= 122°F - 113°F = 9˚F
OCH512
53
10-9. TEST POINT DIAGRAM
Outdoor controller circuit board
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
<CAUTION> TEST POINT1 is high voltage.
SW7
SW1
CN51
Demand control setting
Forced defrost, detect history record reset, refrigerant address
External signal output
• Compressor operating signal
• Abnormal signal
SW6
Model select
SW4
CNDM
Test operation
Function switch
1 to 2:
Input of low-level
sound priority mode
1 to 3:
Input of external contact point
SW8
CN52C
SWP
Pump down
SW5
(Connect to the noise
filter circuit board
(CN52C))
Wiring replace
CNM
Connect to A control
service tool
CN4
CNMNT
Connect to
M-NET adapter (CN5)
Transmission to outdoor power circuit
board (CN4)
CNVMNT
Connect to
M-NET adapter (CND)
SV2
Bypass valve
<A24/30/36 only>
LEV-A
Linear expansion
valve
21S4
Four-way valve
<PUZ only>
TH3
Thermistor
<Outdoor pipe>
CN2
Connect to the outdoor
power circuit board (CN2)
1-5: Reception from
power circuit board
2-5: Zero cross signal
(0-5V DC)
3-4: 18V DC
6-5: 16V DC
7-5: 16V DC
TH7/6
Thermistor
<Outdoor/2-phase pipe>
TH32
Thermistor <Shell>
63H
High pressure switch
CNAC
2 to 4:
Power supply for outdoor controller circuit
board (208V-230V AC)
1 to 3:
Power supply for indoor
and outdoor unit connection wire
(208/230V AC)
VFG
(TEST POINT 4)
(Voltage between
right pins of PC5C
and PC5D, pin 3
and pin 4)
(Same as
(CNF17(+)-4(-))
VSP
(TEST POINT 3)
CNS
S1-S2: A208/230V AC
(Voltage between pins
of C5A, C5B):
DC 0V (when stopped),
DC 1– 6.5V
CNF1, CNF2
(when operated)
Connect to the fan motor
1-4:
5-4:
6-4:
7-4:
OCH512
280V DC
15V DC
0-6.5V DC
15V DC (When stopped)
7.5V DC (When operated)
(0V-15V pulse)
CNDC
280V DC (1+, 3-)
(Outdoor power circuit
board)
54
+ Communication power supply
D71 Voltage
24V DC
Outdoor noise filter circuit board
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
CN52C
52C driving signal (Connect to
the outdoor controller circuit
board (CN52C))
RS1
LO, NO
Voltage of 208/230V AC is output
(Connect to the outdoor power
circuit board (TABS, TABT))
CNAC1, CNAC2
208/230V AC
(Connect to the
outdoor controller circuit board
(CNAC))
E2
Connect to the earth
CN5
Primary current
(Connect to the outdoor power
circuit board (CN5))
EI
Connect to the earth
LI, NI
Voltage of 208/230V AC is input. (Connect to the terminal block (TB1))
OCH512
55
Outdoor power circuit board
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
CN2
Connect to the outdoor controller circuit board
(CN2)
1-5:Transmitting signal to the outdoor
controller circuit board (0~5V DC)
2-5:Zero cross signal (0~5V DC)
3-4:18V DC
6-5:16V DC
7-5:16V DC
Brief check of POWER MODULE
W Usually, they are in a state of being short-circuited if they are broken.
Measure the resistance in the following points (connectors, etc.).
If they are short-circuited, it means that they are broken.
1. Check of diode bridge
TABP1-TABS, TABN1-TABS, TABP1-TABT,TABN1-TABT
2. Check of DIP-IPM
P-U, P-V, P-W, N-U, N-V, N-W
DIP-IPM
CNDC
280-380V DC (1+, 3–)
Connect to the outdoor
controller circuit board
TABS/TABT
Connect to the
outdoor noise filter circuit board
Voltage among
phases:
208/230V AC
CNAF
Connect to ACTM
CN3
Thermistor (TH8)
<Heatsink>
CN5
Detection of primary
current
Connect to the
outdoor noise filter
circuit board (CN5)
TABP1
Connect to 52C
TABN1
Connect to
ACTM
CN4
Connect to the
outdoor controller
circuit board (CN4)
TABP2/SC-P2
Connect to
ACTM
TABN
Connect to the
smoothing capacitor
CB –
(A42N only)
OCH512
TABP
Connect to the
smoothing capacitor
CB +
(A42N only)
TABU/V/W
Connect to the compressor (MC)
Voltage among phases: 10V~180V AC
56
TABN2
Connect to ACTM
Active filter module
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
P
Connect to the outdoor power
circuit board (TABP2)
L1, L2
Connect to the
DCL (Reactor)
N1
Non-connect
Lower side
Upper side
+
N2
Non-connect
Connect to the
outdoor power
circuit board
(TABP1)
Connect to the outdoor power
circuit board (CNAF)
1
: GND
2-1 : 18V DC
3-1 : Control signal
4, 5 : Not used
6-1 : Control signal
–
Connect to the outdoor power
circuit board (TABN1)
Io
Connect to the outdoor power
circuit board (TABN2)
DCL
L1
L2
(+)
ACTM
P
N1
N2
(–)
Io
Tester check points of Active filter module
Error condition Normal value (reference)
(–) and Io
(–) and L2
P and L2
P and Io
L2 and Io
open
less than 1"
short
100k" ~ 1M"
open
W1
short
100k" ~ 1M"
open
W1
short
100k" ~ 1M"
open
W1
short
100k" ~ 1M"
open
W1
+
Load
Connection and internal circuit diagram
Symptom when the unit is in trouble
1 The unit does not operate (can not be switched ON)
1 The breaker operates
1 The unit does not operate (can not be switched ON) 2 U9 Abnormal stop (W2)
1 The breaker operates
1 The unit does not operate (can not be switched ON) 2 U9 Abnormal stop (W2)
1 The breaker operates
1 The unit does not operate (can not be switched ON) 2 U9 Abnormal stop (W2)
1 The breaker operates
1 The unit does not operate (can not be switched ON) 2 U9 Abnormal stop (W2)
W1. The symptom when the unit is in open error condition is described to determine open error by tester check.
ON
: Code "20" display
W2. SW2 setting
OFF
1
OCH512
6
57
10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS
(1) Function of switches
The black square (■) indicates a switch position.
Type
of Switch No.
switch
Action by the switch operation
Function
ON
OFF
1
Forced defrost +1
Start
Normal
When compressor is operating
in heating operation. +1
2
Abnormal history clear
Clear
Normal
Off or operating
ON
3
ON
1 2 3 4 5 6
0
ON
Dip
switch
SW1
4
Refrigerant address
setting
5
1 2 3 4 5 6
4
ON
ON
1 2 3 4 5 6
2
ON
1 2 3 4 5 6
5
ON
ON
1 2 3 4 5 6
6
1 2 3 4 5 6
7
ON
1 2 3 4 5 6
10
ON
1 2 3 4 5 6
13
1 2 3 4 5 6
3
ON
ON
1 2 3 4 5 6
9
1 2 3 4 5 6
12
When power supply ON
1 2 3 4 5 6
11
ON
1 2 3 4 5 6
14
1 2 3 4 5 6
15
1
Test run
Operating
OFF
2
Test run mode setting
Heating
Cooling
1
No function
—
—
—
—
—
—
Used
Not used
When power supply ON
Start
Normal
Under suspension
SW8 2
No function
Separate indoor/outdoor
3
unit power supplies
Push
switch
1 2 3 4 5 6
1
1 2 3 4 5 6
8
6
ON
ON
ON
SW4
Effective timing
SWP
Pump down
Under suspension
w1 Forced defrost should be done as follows.
1 Change the DIP SW1-1 on the outdoor controller board from OFF to ON.
2 Forced defrost will start by the above operation 1 if all these conditions written below are satisfied.
· Heat mode setting
· 10 minutes have passed since compressor started operating or previous forced defrost finished.
· Pipe temperature is less than or equal to 8°C [46°F].
Forced defrost will finish if certain conditions are satisfied.
Forced defrost can be done if above conditions are satisfied when DIP SW1-1 is changed from OFF to ON.
After DIP SW1-1 is changed from OFF to ON, there is no problem if DIP SW1-1 is left ON or changed to OFF again. This
depends on the service conditions.
OCH512
58
Type of
Switch No.
Switch
1
SW5
No function
Dip
switch
SW9
No auto recovery
When power supply ON
3,4,5
No function
—
—
—
6
Model select
Following SW5-6 reference
Setting of demand
control
+3
2
SW7-1
SW7-2
Power consumption
(Demand switch ON)
OFF
OFF
0% (Operation stop)
ON
OFF
50%
OFF
ON
75%
Always
3
Max. Hz setting(cooling)
Max. Hz(cooling) % 0.8
Normal
Always
4
Max. Hz setting(heating) Max. Hz(heating) % 0.8
Normal
Always
—
5
No function
—
—
6
Defrost setting
For high humidity
Normal
1
No function
—
—
Always
—
2
Function switch
Valid
Normal
Always
3,4
No function
—
—
—
MODEL
2
4
5
SW6
ON
PUZ-A42NHA5 OFF
3
SW5-5.6
1 2 3 4 5 6 7 8
ON
OFF
1 2 3 4 5 6
Model select
6
MODEL
7
SW6
ON
PUY-A42NHA5 OFF
8
SW5
—
Auto recovery
1
SW6
Effective timing
Power failure
automatic recovery +2
2
1
SW7
+4
Action by the switch operation
ON
OFF
—
—
Function
5
SW5-5.6
1 2 3 4 5 6 7 8
ON
OFF
1 2 3 4 5 6
The black square (■) indicates a switch position.
6
w2 Power failure automatic recovery can be set by either remote controller or this DIP SW. If one of them is set to ON, Auto
recovery activates. Please set Auto recovery basically by remote controller because not all units have DIP SW.
Please refer to the indoor unit installation manual.
w3 SW7-1,2 are used for demand control. SW7-1,2 are effective only at the demand control.
(Refer to next page : Special function (b))
w4 Please do not use SW7-3~6 usually. Trouble might be caused by the usage condition.
(2) Function of connector
Types
Connector
Function
Connector
CN31
Emergency operation
OCH512
Action by open/ short operation
59
Short
Open
Start
Normal
Effective timing
When power supply ON
Special function
(a) Low-level sound priority mode (Local wiring)
Unit enters into Low-level sound priority mode by external signal input setting.
Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual.
Adding a commercial timer or on-off switch contactor setting to the CNDM connector which is optional contactor for demand
input located on the outdoor controller board enables to control compressor operation frequency.
W The performance depends on the load of conditioned outdoor temperature.
How to wire
<Low-level sound priority mode circuit>
Insulate this point securely as
this is not used.
Purchased locally
Relay
supply
Adaptor for external
signal input
(PAC-SC36NA)
Red 3
Brown 2
Orange 1
~ SW1
X
CNDM
X
SW1 : Switch
X : Relay (Contact spec. : DC1mA)
Outdoor unit
controller board
Max. 10 m[33ft] including local wiring
1) Make the circuit as shown above with Adaptor for external signal input (PAC-SC36NA).
2) Turn SW1 to on for Low-level sound priority mode.
Turn SW1 to off to release Low-level sound priority mode and normal operation.
(b) Demand control (Local wiring)
Demand control is available by external input. In this mode, power consumption is decreased within the range of usual
0~100%.
How to wire
Basically, the wiring is the same as (a).
Connect an SW1 which is procured at field to the between Orange and Red (1 and 3) of the Adaptor for external signal
input (PAC-SC36NA), and insulate the tip of the brown lead wire.
It is possible to set it to the following power consumption (compared with ratings) by setting the SW7-1, 2.
SW7-1
SW7-2
Power consumption
(SW1 on)
OFF
OFF
0% (Operation stop)
ON
OFF
50%
OFF
ON
75%
OCH512
60
<Display function of inspection for outdoor unit>
The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of
abnormality can be indicated in details by connecting an optional part ‘A-Control Service Tool (PAC-SK52ST)’ to connector
CNM on outdoor controller board.
[Display]
(1)Normal condition
Unit condition
When the power is turned on
When unit stops
When compressor is warming up
When unit operates
Outdoor controller board
A-Control Service Tool
LED1 (Green)
LED2 (Red)
Error code
Lighted
Lighted
Lighted
Lighted
Lighted
Not lighted
Not lighted
Lighted
00, etc.
08, etc.
C5, H7 etc.
Indication of the display
Alternately blinking display
Operation mode
(2)Abnormal condition
Indication
Outdoor controller board
LED1 (Green) LED2 (Red)
Error
Contents
Error
code
+1
1 blinking 2 blinking
Connector (63H) is open.
2 blinking 1 blinking Miswiring of indoor/outdoor unit
connecting wire, excessive number of
indoor units (4 units or more)
Miswiring of indoor/outdoor unit
connecting wire (converse wiring or
disconnection)
Startup time over
2 blinking Indoor/outdoor unit communication
error (signal receiving error) is
detected by indoor unit.
Indoor/outdoor unit communication
error (transmitting error) is
detected by indoorunit.
Indoor/outdoor unit communication
error (signal receiving error) is
detected by outdoor unit.
Indoor/outdoor unit communication
error (transmitting error) is
detected by outdoor unit.
3 blinking Remote controller signal receiving
error is detected by remote controller.
F5
Inspection method
Check if connector (63H) on the outdoor controller board
is not disconnected.
Check continuity of pressure switch (63H) by tester.
Detailed
reference
page
P.27
— Check if indoor/outdoor connecting wire is connected correctly. P.28
Check if 4 or more indoor units are connected to outdoor unit. (EA)
— Check if noise entered into indoor/outdoor connecting wire P.28
or power supply.
(Eb)
Re-check error by turning off power, and on again.
P.28
—
(EC)
E6 Check if indoor/outdoor connecting wire is connected correctly. +2
Check if noise entered into indoor/outdoor connecting wire or
power supply.
Check if noise entered into indoor/outdoor controller board.
— Re-check error by turning off power, and on again.
E7
+2
P.33
(E8)
—
P.33
(E9)
E0 Check if connecting wire of indoor unit or remote controller P.32
is connected correctly.
Remote controller transmitting error
is detected by remote controller.
E3 Check if noise entered into transmission wire of remote
P.32
Remote controller signal receiving
error is detected by indoor unit.
E4
P.32
Remote controller transmitting error
is detected by indoor unit.
E5
4 blinking Error code is not defined.
controller.
Re-check error by turning off power, and on again.
P.32
EF Check if remote controller is MA remote controller (PAR-21MAA). P.33
Check if noise entered into transmission wire of remote controller.
Check if noise entered into indoor/outdoor connecting wire.
Re-check error by turning off power, and on again.
5 blinking Serial communication error
<Communication between outdoor
controller board and outdoor power
board>
<Communication between outdoor
controller board and M-NET P.C. board>
Communication error of M-NET
system
Ed Check if connector (CN4) on outdoor controller board and
P.33
A0~A8
P.34~
P.37
outdoor power board is not disconnected.
Check if there is poor connection of connector on outdoor
controller board(CNMNT and CNVMNT).
Check M-NET communication signal.
1.Error code displayed on remote controller
2.Refer to service manual for indoor unit.
OCH512
61
Indication
Outdoor controller board
LED1 (Green) LED2 (Red)
Error
Contents
Error
code
+1
3 blinking 1 blinking Abnormality of shell thermistor (TH32) U2
2 blinking Abnormal high pressure (High U1
pressure switch 63H operated.)
Inspection method
Detailed
reference
page
Check if stop valves are open.
Check if connectors (TH32, LEV-A) on outdoor controller board are not
disconnected.
Check if unit is filled with specified amount of refrigerant.
Measure resistance values among terminals on indoor valve and outdoor linear
expansion valve using a tester.
P.29
Check if indoor/outdoor units have a short cycle on their air ducts.
Check if connector (63H) on outdoor controller board is not disconnected.
Check if heat exchanger and filter is not dirty.
Measure resistance values among terminals on linear expansion valve using a
tester.
P.29
3 blinking Abnormality of outdoor fan
motor rotational speed
U8
Check the outdoor fan motor.
P.31
4 blinking Compressor overcurrent
breaking (Start-up locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
5 blinking Open/short of shell thermistor (TH32)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
6 blinking Abnormality of heatsink
temperature
7 blinking Abnormality of voltage
UF
Check if stop valves are open.
Check looseness, disconnection, and converse connection of compressor wiring.
Measure resistance values among terminals on compressor using a tester.
Check if outdoor unit has a short cycle on its air duct.
P.31
4 blinking 1 blinking Abnormality of room temperature
thermistor (TH1)
Abnormality of pipe temperature
thermistor /Liquid (TH2)
Abnormality of pipe temperature
thermistor/Condenser-Evaporator(TH5)
2 blinking Abnormality of drain sensor (DS)
Float switch connector open(FS)
Indoor drain overflow protection
UP
UH
U6
U3
U4
U5
Check if indoor/outdoor units have a short cycle on their air ducts.
Measure resistance value of outdoor heatsink thermistor(TH8).
P.30
U9
Check looseness, disconnection, and converse connection of compressor wiring.
Measure resistance value among terminals on compressor using a tester.
Check the continuity of contactor (52C).
Check if power supply voltage decreases.
Check the wiring of CN52C.
Check the wiring of CNAF.
P.31
P1
Check if connectors (CN20, CN21, CN29, and CN44) on indoor controller board
are not disconnected.
Measure resistance value of indoor thermistors.
2
P2
P9
P4
5 blinking Abnormality of indoor
controller board
–
–
Abnormality of remote
controller board
1 Error code displayed on remote controller
2 Refer to service manual for indoor unit.
OCH512
2
2
Check if connector (CN31)(CN4F) on indoor controller board is not disconnected.
Measure resistance value of indoor thermistors.
Measure resistance value among terminals on drain pump using a tester.
Check if drain pump works.
Check drain function.
2
Check if indoor unit has a short cycle on its air duct.
Check if heat exchanger and filter is not dirty.
Measure resistance value on indoor and outdoor fan motors.
Check if the inside of refrigerant piping is not clogged.
2
P8
Check if indoor thermistors (TH2 and TH5) are not disconnected from holder.
Check if stop valve is open.
Check converse connection of extension pipe. (on plural units connection)
Check if indoor/outdoor connecting wire is connected correctly. (on plural units
connection)
2
Fb
Replace indoor controller board.
+2
E1
E2
Replace remote controller.
P5
3 blinking Freezing (cooling)/overheating P6
(heating) protection
4 blinking Abnormality of pipe
temperature
Check if connectors (TH3, TH6, TH7 and TH32) on outdoor controller board and connector (CN3) on outdoor power board are not disconnected.
Measure resistance value of outdoor thermistors.
P.32
P.31
P.30
P.29
P.30
62
P.32
<Outdoor unit operation monitor function>
[When option part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to outdoor controller board (CNM)]
Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of error code by
controlling DIP SW2 on ‘A-Control Service Tool’.
Operation indicator
The black square (■) indicates a switch position.
SW2 : Indicator change of self diagnosis
Unit
Explanation for display
Display detail
SW2 setting
ON
1 2 3 4 5 6
<Digital indicator LED1 working details>
(Be sure that 1 to 6 in the SW2 are set to OFF.)
(1) Display when the power supply ON.
When the power supply ON, blinking displays by turns.
Wait for 4 minutes at the longest.
(2) When the display lights. (Normal operation)
1Operation mode display
1 second
interval
SW2
(Lighting)
ON
LED1
(Initial setting)
1 2 3 4 5 6
The ones digit : Relay output
Warming-up
Display
Compressor Compressor 4-way valve
The tens digit : Operation mode
Display
Operation Model
OFF / FAN
COOLING / DRY +
HEATING
DEFROSTING
O
C
H
d
2Display during error postponement
Postponement code is displayed when
compressor stops due to the work of
protection device.
Postponement code is displayed while
error is being postponed.
—
—
—
—
—
—
—
—
ON
ON
0
1
2
3
4
5
6
7
8
A
—
—
—
—
ON
ON
ON
ON
—
—
—
—
ON
ON
—
—
ON
ON
—
ON
Solenoid valve
—
ON
—
ON
—
ON
—
ON
—
—
(3) When the display blinks
Inspection code is displayed when compressor stops due to the work of protection devices.
Display Inspection unit
0
Outdoor unit
1
Indoor unit 1
2
Indoor unit 2
Display
U1
U2
U3
U4
U5
U6
U8
UF
UH
UP
P1~P8
A0~A7
Contents to be inspected (During operation)
Abnormal high pressure (63H operated)
Abnormal high discharging temperature, shortage of refrigerant
Open/short circuit of shell thermistor (TH32)
Open/short of outdoor unit thermistors (TH3, TH6, TH7 and TH8)
Abnormal temperature of heatsink
Abnormality of power module
Abnormality in outdoor fan motor.
Compressor overcurrent interruption (When Comp. locked)
Current sensor error
Compressor overcurrent interruption
Abnormality of indoor units
Communication error of M-NET system
Display Contents to be inspected (When power is turned on)
F5
E8
E9
EA
Eb
EC
E0~E7
63H connector(yellow) is open.
Indoor/outdoor communication error (Signal receiving error) (Outdoor unit)
Indoor/outdoor communication error (Transmitting error) (Outdoor unit)
Miswiring of indoor/outdoor unit connecting wire, excessive number of indoor units (4 units or more)
Miswiring of indoor/outdoor unit connecting wire(converse wiring or disconnection)
Startup time over
Communication error except for outdoor unit
OCH512
63
Pipe temperature / Liquid(TH3)
– 40~194
ON
The black square (■) indicates a switch position.
Unit
Explanation for display
Display detail
SW2 setting
1 2 3 4 5 6
– 40~194 (– 40~90:)
(When the coil thermistor detects 0˚F or below, “–”
and temperature are displayed by turns.)
(Example) When -10˚F;
0.5 secs. 0.5secs. 2 secs.
˚F
10
Shell temperature (TH32)
37~327
ON
1 2 3 4 5 6
ON
37~327 (3~164:)
(When the discharge thermistor detects 100˚F or
more, hundreds digit, tens digit and ones digit are
displayed by turns.)
(Example) When 105˚F;
0.5 secs. 0.5secs. 2 secs.
1
05
˚F
Output step of outdoor FAN
0~10
0~10
The number of ON / OFF times of compressor
0~9999
0~9999
(When the number of times is 100 or more,
hundreds digit, tens digit and ones digit are
displayed by turns.)
(Example) When 42500 times (425 × 100 times);
0.5 secs. 0.5secs. 2 secs.
4
25
100 times
0~9999
(When it is 100 hours or more, hundreds digit, tens
digit and ones digit are displayed by turns.)
(Example) When 2450 hours (245 × 10 hours);
0.5 secs. 0.5secs. 2 secs.
2
45
10 hours
Step
1 2 3 4 5 6
ON
1 2 3 4 5 6
Compressor integrating operation times
0~9999
ON
1 2 3 4 5 6
ON
Compressor operating current
0~50
0~50
wOmit the figures after the decimal fractions.
Compressor operating frequency
0~255
0~255
(When it is 100Hz or more, hundreds digit, tens
digit and ones digit are displayed by turns.
(Example) When 125Hz;
0.5 secs. 0.5secs. 2 secs.
1
25
Hz
0~480
(When it is 100 pulse or more, hundreds digit, tens
digit and ones digit are displayed by turns.
(Example) When 150 pulse;
0.5 secs. 0.5secs. 2 secs.
1
50
Pulse
A
1 2 3 4 5 6
ON
1 2 3 4 5 6
LEV-A opening pulse
0~480
ON
1 2 3 4 5 6
ON
Error postponement code history (1)
of outdoor unit
Postponement code display
Blinking: During postponement
Lighting: Cancellation of postponement
“00” is displayed in case of no postponement.
Operation mode on error occurring
Operation mode of when operation stops due to
error is displayed by setting SW2 as below.
1 2 3 4 5 6
ON
(SW2)
ON
1 2 3 4 5 6
1 2 3 4 5 6
OCH512
64
Code
display
Code
display
SW2 setting
ON
The black square (■) indicates a switch position.
Unit
Explanation for display
Display detail
Pipe temperature/Liquid (TH3) on error
occurring
– 40~194
1 2 3 4 5 6
ON
Shell temperature (TH32) on error
occurring
37~327
1 2 3 4 5 6
ON
Compressor operating current on error
occurring
0~50
– 40~194 (– 40~90:)
(When the coil thermistor detects 0˚F or below, “–”
and temperature are displayed by turns.)
(Example) When –15˚F;
0.5 secs. 0.5secs. 2 secs.
15
˚F
37~327 (3~164:)
(When the temperature is 100˚F or more, the
hundreds digit, tens digit and ones digit are
displayed by turns.)
(Example) When 130˚F;
0.5 secs. 0.5secs. 2 secs.
1
30
˚F
0~50
A
1 2 3 4 5 6
ON
Error code history (1) (latest)
Alternate display of abnormal unit
number and code
When no error history,
“ 0 ” and “– –” are displayed by turns.
Error code history (2)
Alternate display of error unit number
and code
When no error history,
“ 0 ” and “– –” are displayed by turns.
Thermostat ON time
0~999
0~999
(When it is 100 minutes or more, the hundreds digit,
tens digit and ones digit are displayed by turns.)
(Example) When 245 minutes;
0.5 secs. 0.5secs. 2 secs.
2
45
Code
display
1 2 3 4 5 6
ON
Code
display
1 2 3 4 5 6
ON
1 2 3 4 5 6
OCH512
Test run elapsed time
0~120
0~120
(When it is 100 minutes or more, the hundreds digit,
tens digit and ones digit are displayed by turns.)
(Example) When 105 minutes;
0.5 secs. 0.5secs. 2 secs.
1
05
65
Minute
Minute
The black square (■) indicates a switch position.
Unit
Explanation for display
Display detail
SW2 setting
The number of connected indoor units
ON
0~3
(The number of connected indoor units are displayed.)
Unit
1 2 3 4 5 6
Capacity setting display
ON
Displayed as an outdoor capacity code
Capacity
Code
A42N
25
Code
display
1 2 3 4 5 6
Outdoor unit setting information
• The tens digit (Total display for applied setting)
Setting details
Display details
H·P / Cooling only
0 : H·P
1 : Cooling only
Single phase / 3 phase
0 : Single phase 2 : 3 phase
ON
• The ones digit
Setting details
1 2 3 4 5 6
Display details
Defrosting switch 0 : Normal
Code
display
1 : For high humidity
(Example) When heat pump, 3 phase and
defrosting (normal) are set up, “20” is
displayed.
ON
Indoor pipe temperature / Liquid (TH2(1)) – 38~190 (– 39~88:)
(When the temperature is 0ºF or less, “–” and
Indoor 1
temperature are displayed by turns.)
– 38~190
˚F
Indoor pipe temperature / Cond. / Eva.
(TH5(1))
Indoor 1
– 38~190
˚F
1 2 3 4 5 6
ON
– 38~190 (– 39~88:)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
1 2 3 4 5 6
Indoor pipe temperature / Liquid (TH2(2)) – 38~190 (– 39~88:)
Indoor 2
(When the temperature is 0˚F or less, “–” and
– 38~190
temperature are displayed by turns.)
ON
˚F
1 2 3 4 5 6
ON
Indoor pipe temperature / Cond. / Eva.
(TH5(2))
Indoor 2
– 38~190
– 38~190 (– 39~88:)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
Indoor room temperature (TH1)
46~102
46~102 (8~39:)
˚F
1 2 3 4 5 6
ON
˚F
1 2 3 4 5 6
OCH512
66
SW2 setting
ON
The black square (■) indicates a switch position.
Unit
Explanation for display
Display detail
Indoor setting temperature
62~86
62~86 (17~30:)
Outdoor pipe temperature / 2-phase
pipe (TH6)
-38~190
-38~190 (-39~88:)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
Outdoor outside temperature (TH7)
-38~190
-38~190 (-39~88:)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
˚F
1 2 3 4 5 6
ON
˚F
1 2 3 4 5 6
ON
˚F
1 2 3 4 5 6
Outdoor heatsink temperature (TH8)
-40~327
-40~327 (-40~164:)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
(When the thermistor detects 100˚F or more,
hundreds digit, tens digit and ones digit are
displayed by turns.)
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
32~360 (0~182:)
(When the temperature is 100˚F or more, hundreds
digit, tens digit and ones digit are displayed
by turns.)
Discharge superheat. SHd
32~360
Cooling = TH32-TH6
Heating = TH32-TH5
0 – FFFE (in hexadecimal notation)
(When more than FF in hex (255 in decimal), the
number is displayed in order of 163's and 162's, and
161's and 160's places.
(Example) When 5000 cycles;
0.5 secs. 0.5 secs. 2 secs.
9
C4
Number of defrost cycles
0 – FFFE
ON
1 2 3 4 5 6
0~500
(When it is 100 or more, hundreds digit, tens digit
and ones digit are displayed by turns.)
Input current of outdoor unit
ON
˚F
˚F
2 cycles
0.1 A
1 2 3 4 5 6
ON
0~255
(When it is 100Hz or more, hundreds digit, tens
digit and ones digit are displayed by turns.)
Targeted operation frequency
0~255
Hz
1 2 3 4 5 6
ON
180~370
(When it is 100V or more, hundreds digit, tens
digit and ones digit are displayed by turns.)
DC bus voltage
180~370
V
1 2 3 4 5 6
OCH512
67
Capacity save
0~100
When air conditioner is connected to
M-NET and capacity save mode is
demanded, “0”~”100” is displayed.
ON
The black square (■) indicates a switch position.
Explanation for display
Unit
Display detail
SW2 setting
1 2 3 4 5 6
0~100
(When the capacity is 100%, hundreds digit, tens
digit and ones digit are displayed by turns.)
(Example) When 100%;
0.5 secs. 0.5secs. 2 secs.
1
00
%
When there is no setting
of capacity save “100” is
displayed.
ON
Error postponement code history (2)
of outdoor unit
Postponement code display
Blinking: During postponement
Lighting: Cancellation of postponement
“00” is displayed in case of no postponement.
Error postponement code history (3)
of outdoor unit
Postponement code display
Blinking: During postponement
Lighting: Cancellation of postponement
“00” is displayed in case of no postponement.
1 2 3 4 5 6
ON
Code
display
Code
display
1 2 3 4 5 6
ON
Error code history (3) (Oldest)
Alternate display of abnormal unit
number and code.
When no error history, “0” and “– –“ are displayed by
turns.
Error thermistor display
3:
6:
7:
8:
Code
display
1 2 3 4 5 6
When there is no error thermistor,
“–“ is displayed.
ON
Outdoor
Outdoor
Outdoor
Outdoor
pipe temperature /Liquid (TH3)
pipe temperature /2-phase (TH6)
outside temperature (TH7)
heatsink (TH8)
1 2 3 4 5 6
Operation frequency on error occurring
0~255
ON
1 2 3 4 5 6
Fan step on error occurring
0~10
0~255
(When it is 100Hz or more, hundreds digit, tens digit
and ones digit are displayed by turns.)
(Example) When 125Hz;
0.5 secs. 0.5 secs. 2 secs.
1
25
Code
display
Hz
0~10
ON
Step
1 2 3 4 5 6
OCH512
68
SW2 setting
The black square (■) indicates a switch position.
Unit
Explanation for display
Display detail
LEV-A opening pulse on error occurring
0~480
ON
1 2 3 4 5 6
ON
Indoor room temperature (TH1) on error
occurring
46~102
0~480
(When it is 100 pulse or more, hundreds digit, tens
digit and ones digit are displayed by turns.)
(Example) When 130 pulse;
0.5 secs. 0.5 secs. 2 secs.
1
30
Pulse
46~102 (8~39°C)
˚F
1 2 3 4 5 6
ON
Indoor pipe temperature / Liquid (TH2)
on error occurring
-38~190
1 2 3 4 5 6
ON
Indoor pipe temperature / Cond./ Eva.
(TH5) on error occurring
-38~190
1 2 3 4 5 6
ON
Outdoor outside temperature (TH7) on
error occurring
-38~190
1 2 3 4 5 6
Outdoor heatsink temperature (TH8) on
error occurring
-40~327
ON
1 2 3 4 5 6
OCH512
-38~190 (-39~88°C)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
(Example) When –15˚F;
0.5 secs. 0.5 secs. 2 secs.
15
-38~190 (-39~88°C)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
(Example) When –15˚F;
0.5 secs. 0.5 secs. 2 secs.
15
Outdoor pipe temperature / 2-phase
(TH6) on error occurring
-38~190
1 2 3 4 5 6
ON
-38~190 (-39~88°C)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
(Example) When –15˚F;
0.5 secs. 0.5 secs. 2 secs.
15
69
-38~190 (-39~88°C)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
(Example) When –15˚F;
0.5 secs. 0.5 secs. 2 secs.
15
-40~327 (-40~164°C)
(When the temperature is 0˚F or less, “–” and
temperature are displayed by turns.)
(When the temperature is 100˚F or more, hundreds
digit, tens digit and ones digit are displayed by
turns.)
˚F
˚F
˚F
˚F
˚F
Discharge superheat on error occurring
SHd
32~360
ON
1 2 3 4 5 6
The black square (■) indicates a switch position.
Explanation for display
Unit
Display detail
SW2 setting
Cooling = TH32 -TH6
Heating = TH32 -TH5
Sub cool on error occurring. SC
32~266
ON
Cooling = TH6-TH3
Heating = TH5-TH2
1 2 3 4 5 6
Thermostat-on time until error stops
0~999
ON
32~360 (0~182˚C)
(When the temperature is 100˚F or more,
hundreds digit, tens digit and ones digit are
displayed by turns.)
(Example) When 150˚F;
0.5 secs. 0.5 secs. 2 secs.
1
50
32~266 (0~130˚C)
(When the temperature is 100˚F or more,
hundreds digit, tens digit and ones digit are
displayed by turns.)
(Example) When 115˚F;
0.5 secs. 0.5 secs. 2 secs.
1
15
0~999
(When it is 100 minutes or more, hundreds digit, tens
digit and ones digit are displayed by turns.)
(Example) When 415 minutes;
0.5 secs. 0.5 secs. 2 secs.
4
1 2 3 4 5 6
U9 Error status during the Error
postponement period
ON
1 2 3 4 5 6
Description
Normal
Overvoltage error
Undervoltage error
Input current sensor error.
L1 or L2-phase open error.
Abnormal power synchronous signal
PFC/ACTM error
Undervoltage
70
˚F
Minute
15
Detection point
–
Power circuit board
Controller circuit board
Display
00
01
02
Controller circuit board
04
Power circuit board
Check CNAF wiring.
Defective ACTM/P.B.
08
Display examples for multiple errors:
Overvoltage (01) + Undervoltage (02) = 03
Undervoltage (02) + Power-sync signal error (08) = 0A
L1 phase open error (04) + PFC error (10) = 14
OCH512
˚F
20
Code
display
SW2 setting
The black square (■) indicates a switch position.
Unit
Explanation for display
Display detail
Controlling status of compressor
operating frequency
The following code will be a help to know the
operating status of unit.
•The tens digit
Display Compressor operating frequency control
1
Primary current control
2
Secondary current control
ON
•The ones digit (In this digit, the total number of
1 2 3 4 5 6
OCH512
activated control is displayed.)
Display Compressor operating frequency control
Preventive control for excessive temperature
1
rise of discharge temperature
Preventive control for excessive temperature
2
rise of condensing temperature
4
Frosting preventing control
Preventive control for excessive temperature
8
rise of heatsink
(Example)
The following controls are activated.
LED
• Primary current control
• Preventive control for excessive temperature rise of condensing temperature
• Preventive control for excessive temperature rise of heatsink
71
Code
display
11
EASY MAINTENANCE FUNCTION
L Reduces maintenance work drastically.
L Enables you to check operation data of the indoor and outdoor units by remote controller.
Furthermore, use of maintenance stable-operation control that fixes the operating frequency, allows smooth inspection, even
for inverter models.
Smooth Maintenance Function
Discharge temperature 147 °F
L Conventional inspection work
LOutdoor unit L
LIndoor unit L
Measure
the intake air
temperature.
Remove the
service panel.
Easy maintenance information (unit)
Compressor
Accumulated operating
time (%10 hours)
Number of ON/OFF
times (%10 times)
Operating
current (A)
Outdoor unit
Heat exchanger
temperature (°F)
Discharge
temperature (°F)
Outside air
temperature (°F)
Indoor unit
Measure the discharge
temperature.
Intake air
temperature (°F)
Heat exchanger
temperature (°F)
Filter operating
time* (Hours)
Measure the outside
air temperature.
* The filter operating time is the time that has elapsed since the filter was reset.
11-1. MAINTENANCE MODE OPERATION METHOD
*
If you are going to use the "11-2.GUIDE FOR OPERATION CONDITION", set the airflow to "High" before activating
maintenance mode.
L Switching to maintenance mode
Maintenance mode can be activated either when the air conditioner is operated or stopped.
It cannot be activated during test run.
+ Maintenance information can be viewed even if the air conditioner is stopped.
N Remote controller button information
Operation mode
Compressor information Outdoor unit information Indoor unit information
Confirm
Activate/cancel maintenance mode
(1) Press the TEST button for 3 seconds to switch to maintenance mode.
[Display ] MAINTENANCE
If stable operation is unnecessary or if you want to check the data with the air conditioner stopped, skip to step (4).
L Fixed Hz operation
The operating frequency can be fixed to stabilize operation of inverter model.
If the air conditioner is currently stopped, start it by this operation.
(2) Press the
[Display ]
MODE button to select the desired operation mode.
Stable cooling
operation
Stable heating
operation
Stable operation
cancellation
COOL
STABLE MODE
HEAT
STABLE MODE
STABLE MODE
CANCEL
(3) Press the FILTER ( ) button to check the setting.
Stabilized
[Display ] Waiting for stabilization
OCH512
After 10 to 20 minutes
72
Data measurement
When the operation is stabilized, measure operation data as explained below.
(4) Press the [TEMP] buttons (
and
) to select the desired refrigerant address.
[Screen ]
(5) Select the type of data to be displayed.
After selecting, go to step (6).
Compressor information
MENU button
[Display ]
Cumulative
operation time
ON/OFF Number
COMP ON
%10 HOURS
COMP ON
%100 TIMES
Operating current
COMP ON
CURRENT (A)
Outdoor unit information
ON/OFF button
exchanger
Heat
temperature
[Display ]
OUTDOOR UNIT
H·EXC. TEMP
Comp discharge
temperature
OUTDOOR UNIT
OUTLET TEMP
Outdoor ambient
temperature
OUTDOOR UNIT
OUTDOOR TEMP
Indoor unit information
button
[Display ]
Indoor room
temperature
Heat exchanger
temperature
INDOOR UNIT
INLET TEMP
INDOOR UNIT
H·EXC. TEMP
Filter operating
time
INDOOR UNIT
FILTER USE H
(6) Press the FILTER ( ) button to check the setting.
[Display example for accumulated operating time]
Flashing
Display Waiting for response
After approx.
10 seconds
12,340 hours
(7) Data is displayed on the display (at ).
To check the data for each item, repeat steps (5) to (7).
(8) To cancel maintenance mode, press the
TEST
button for 3 seconds or press the
Refrigerant address
Single refrigerant system
button.
Multi refrigerant system (group control)
In the case of single refrigerant system, the refrigerant address
is "00" and no operation is required.
Simultaneous twin units belong to this category
(single refrigerant system).
[1:1]
Refrigerant
address=00
[Twin]
Refrigerant
address=00
Outdoor
unit
Outdoor
unit
Indoor unit
01
Indoor unit
01
Remote
controller
Remote
controller
OCH512
ON/OFF
Indoor unit
02
Up to 16 refrigerant systems (16 outdoor units) can be connected as a group by one remote controller. To check or set the
refrigerant addresses.
Refrigerant
address
00
Outdoor
unit
Refrigerant
address
01
Outdoor
unit
Refrigerant
address
02
Outdoor
unit
Refrigerant
address
15
Outdoor
unit
Indoor unit
01
Indoor unit
01
Indoor unit
01
Indoor unit
01
Remote
controller
73
11-2.GUIDE FOR OPERATION CONDITION
Good
Retightened
Indoor Unit
Good
Retightened
M
V
Accumulated operating time
Cleanliness
CleanliTemperature
Temperature
ness
Enter the temperature differences between , , and into
the graph given below.
Operation state is determined according to the plotted areas on
the graph.
For data measurements, set the fan speed to "Hi" before activating maintenance mode.
Time
Number of ON/OFF times
Times
Current
A
Classification
Refrigerant/heat exchanger temperature
COOL
°F HEAT
°F
Refrigerant/discharge temperature
COOL
°F HEAT
°F
Air/outside air temperature
COOL
°F HEAT
°F
(Air/discharge temperature)
COOL
°F HEAT
°F
Appearance
Good
Cleaning required
Heat exchanger
Good
Cleaning required
Sound/vibration
None
Air/intake air temperature
Present
°F
COOL
°F HEAT
°F
Refrigerant/heat exchanger temperature COOL
°F HEAT
°F
Time
Decorative panel
Good
Cleaning required
Filter
Good
Cleaning required
Fan
Good
Cleaning required
Heat exchanger
Good
Cleaning required
Sound/vibration
None
Present
Temperature ( Discharge temperature) – ( Outdoor
difference
Inspection
Is "000" displayed stably in Display on the remote controller?
Temperature ( Discharge temperature) – ( Indoor
difference
Filter may be clogged. *1
Inspection A
Performance has dropped. Detailed in-
Heat
spection is necessary.
Inspection B
Refrigerant amount is dropping.
Inspection C
Filter or indoor heat exchanger may be
( Indoor intake air temperature)— (Indoor
heat exchanger temperature)
Normal operation state
Filter inspection
°F
heat exchanger temperature)
°F
Heat mode
°F
ºF
81
72
Inspection C
63
54
45
36
Filter inspection
Normal
27
18
Inspection B
Inspection A
9
0 18 36 54 72 90 108 126 144
°F
[ Discharge temperature] – [ Outdoor
heat exchanger temperature)
clogged.
* The above judgement is just guide based on Japanese standard
conditions.
*1 It may be changed depending on the indoor and outdoor temperature.
It may be judged as "filter inspection" due to the outdoor and indoor
temperature, even though it is not clogged.
OCH512
Stable Unstable
* Fixed Hz operation may not be possible under the following temperature ranges.
A)In cool mode, outdoor intake air temperature is 104 °For higher or
indoor intake air temperature is 73 °F or lower.
B)In heat mode, outdoor intake air temperature is 68 °F or higher or
indoor intake air temperature is 77 °F or lower.
* If the air conditioner is operated at a temperature range other than the
ones above but operation is not stabilized after 30 minutes or more have
elapsed, carry out inspection.
* In heat mode, the operation state may vary due to frost forming on the
outdoor heat exchanger.
Result
Normal
°F
( Indoor intake air temperature)
Judgment
Cool
°F
heat exchanger temperature)
Cool mode
Check item
Stable Unstable
( Indoor heat exchanger temperature) –
* The filter operating time is the time that has elapsed since the filter was reset.
Area
Result
Indoor heat exchanger temperature)
°F HEAT
Filter operating time*
Item
Is "000" displayed stably in Display on the remote controller?
( Indoor intake air temperature) – (
COOL
(Air/discharge temperature)
Inspection
74
( Indoor heat exchanger temperature) —
( Indoor intake air temperature)
Outdoor Unit
Cool
Retightened
(Voltage)
pressor
Outdoor Unit
Good
(Insulation resistance)
Com-
Indoor Unit
Terminal block
Check Points
Result
Breaker
Heat
Loose connection
Power supply
Inspection item
81
72
Inspection C
Filter inspection
63
54
45
Normal
36
27
18
Inspection B
Inspection A
9
18 36 54 72 90 108 126 144
°F
[ Discharge temperature] – [ Indoor
heat exchanger temperature)
12
FUNCTION SETTING
12-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER
Each function can be set according to necessity using the remote controller. The setting of function for each unit can only be
done by the remote controller. Select function available from the table 1.
(1) Functions available when setting the unit number to 00 (Select 00 referring to 4 setting the indoor unit number.)
<Table 1> Function selections
Mode No.
Function
Settings
: Initial setting
Wired remote controller Setting No.
(when sent from the factory)
(RF thermistor)
Power failure
automatic recovery
Indoor temperature
detecting
Not available
Available
Average data from each indoor unit
Data from the indoor unit with remote controllers
Data from main remote controller
LOSSNAY
Not supported
connectivity
Supported (indoor unit dose not intake outdoor air through LOSSNAY)
Supported (indoor unit intakes outdoor air through LOSSNAY)
Power supply
230V
voltage
208V
Frost prevention 2 [36°F] (Normal)
temperature
3 [37°F]
Humidifier control When the compressor operates, the humidifier also operates.
When the fan operates, the humidifier also operates.
Change of
Standard
defrosting control For high humidity
1
2
1
2
3
1
2
3
1
2
1
2
1
2
1
2
01
(101)
02
(—)
03
(103)
04
(104)
15
(115)
16
(116)
17
(117)
Remarks
The setting is
applied to all
the units in the
same
refrigerant
system.
Meaning of "Function setting"
Mode02 : indoor temperature detecting
OUTDOOR
OUTDOOR
INDOOR
INDOOR
INDOOR
INDOOR
OUTDOOR
OUTDOOR
INDOOR
INDOOR
No. Indoor temperature(ta)=
REMOTE
(MAIN)
No1. Average data of the
sensor on all the
indoor units
Initial ta=(A+B)/2
setting
REMOTE
(MAIN)
REMOTE
(SUB)
REMOTE
(SUB)
REMOTE
(MAIN)
REMOTE
(SUB)
REMOTE
(MAIN)
ta=(A+B)/2
ta=A
ta=A
No2. Data of the sensor
on the indoor unit that
connected
with remote controller
ta=A
ta=B
ta=A
ta=A
No3. Data of the sensor
on main remote
controller
ta=C
ta=C
ta=C
ta=C
OCH512
75
(2) Functions available when setting the unit number to 01-03 or AL (07 in case of IR wireless remote controller)
• When setting functions for an indoor unit in an independent system, set the unit number to 01 referring to 4 setting the
indoor unit number.
• When setting functions for a simultaneous twin indoor unit system, set the unit number to 01 to 03 for each indoor
unit in case of selecting different functions for each unit referring to 4 setting the indoor unit number.
• When setting the same functions for an entire simultaneous Twin-indoor unit system, set refrigerant address to AL
(07 in case of IR wireless remote controller) referring to 4 setting the indoor unit number.
: Initial setting (Factory setting)
- : Not available
Mode No.
Function
Filter sign
Air flow
(Fan speed)
No.of air outlets
Optional high efficiency
filter
Vane setting
Optional humidifier
(PLA only)
Vane differential setting
in heating mode
(cold wind prevention)
Swing
Set temperature in heating
mode (4 deg up) *1
Fan speed when the
heating thermostat is OFF
Fan speed when the
cooling thermostat is OFF
Detection of abnormality of
the pipe temperature (P8)
Settings
Wired remote controller
(RF thermistor)
100h
2500h
"Clean the filter" indicator is not displayed
Quiet
Standard
High ceiling
4 directions
3 directions
2 directions
Not supported
Supported
No vanes (Vane No.3 setting : PLA only)
Vane No.1 setting
Vane No.2 setting
Not supported
Supported
No.1 setting (TH5: 75-82°F (24-28))
No.2 setting (Standard, TH5: 82-90°F (28-32))
No.3 setting (TH5: 90-100°F (32-38))
Not available Swing
PLA-BA
Available
Wave air flow
Available
Not available
Extra low
Stop
Keeping fan speed set by remote controller
Keeping fan speed set by remote controller
Stop
Detect
Neglect
}
07
(107)
08
(108)
09
(109)
10
(110)
11
(111)
13
(113)
14
(114)
23
(123)
24
(124)
25
(125)
27
(127)
28
(128)
Setting No.
4-Way cassette
Ceiling suspended
PLA-BA
PCA-KA
1
2
3
1
2
3
1
2
3
1
2
1
2
3
1
2
1
2
3
1
2
1
2
1
2
3
1
2
1
2
-
-
Mode No.11
Setting No.
1
2
3
Settings
Vane No.3 setting
No Vanes
Vane No.1 setting
Vane No.2 setting
PLA-BA
PCA-KA
Less smudging
( Downward position than the standard )
Standard
Standard
Less draft *
( Upward position than the standard )
Less draft *
( Upward position than the standard )
* Be careful of the smudge on ceiling.
OCH512
No vane function
76
12-1-1. Selecting functions using the wired remote controller
First, try to familiarize yourself with the flow of the function selection procedure. In this section, an example of setting the room
temperature detection position is given.
For actual operations, refer to steps to .
Setting number
Refrigerant address
Unit number
Mode number
Modes 01 to 14 can be activated
by pressing buttons and simultaneously, and modes 15 to
28 by pressing buttons and .
Selecting functions using the wired remote controller
Check the function selection setting.
Switch to function setting mode.
(Press and at the same time
with stop the remote controller.)
For modes 15 and higher,
press and at the same time.
Specify refrigerant address 00 (outdoor unit).
Specify unit No. 00. (indoor unit)
(Use and .)
Enter the setting.
(Press .)
NO
Select mode No. 02
(room temperature detection position).
Select setting No. 03 (remote controller fixed).
(Use and .)
Enter the setting.
(Press .)
Finished
YES
(Specified indoor unit:
FAN operation)
Example:
Selecting room temperature
detection position
Change refrigerant
address or unit No.
NO
YES
End function display.
(Press and at the same time.)
The above procedure must be carried out only if changes are necessary.
OCH512
77
[Operating Procedure]
Check the setting items provided by function selection.
If settings for a mode are changed by function selection, the functions of that mode will be changed accordingly. Check all the current settings according to steps to , fill in the "Check" column in Table 1, then change them as necessary. For initial settings, refer to the indoor unit's installation manual.
Switch off the remote controller.
Hold down the FILTER (
mode is 15 to 28) and TEST
buttons simultaneously for at least 2 seconds. FUNCTION
SELECTION will start to blink,
then the remote controller's display content will change as shown below.
Set the outdoor unit's refrigerant address.
Press the [ CLOCK] buttons (
and
) to select the desired
refrigerant address. The refrigerant address changes from "00" to "15".
(This operation is not possible for single refrigerant systems.)
Refrigerant address
display section
blinked for 2 seconds or "88" blinks in the room temperature display area for 2 seconds, a transmission error may have occurred.
* If the unit stops after FUNCTION
SELECTION
Check to see if there are any sources of noise or interference near the transmission path.
Note : If you have made operational mistakes during this procedure, exit function selection (see step ), then restart from step .
Set the indoor unit number.
Press the display area.
and
) to select the unit
Press the [ CLOCK] buttons (
number of the indoor unit for which you want to perform function selection.
The unit number changes to "00", "01", "02","03",04" and "AL" each time
a button is pressed.
ON/OFF button so that "- -" blinks in the unit number
Unit number
display section
When the refrigerant address and unit number are confirmed by pressing the
MODE button, the corresponding indoor unit will start fan operation. This
helps you find the location of the indoor unit for which you want to perform function
selection. However, if "00" or "AL" is selected as the unit number, all the indoor
units corresponding to the specified refrigerant address will start fan operation.
* To set modes 01 to 06 or 15 to 22, select unit number "00".
* To set modes 07 to 14 or 23 to 28, carry out as follows:
To set each indoor unit individually, select " 01" to "04".
To set all the indoor units collectively, select " AL".
Confirm the refrigerant address and unit number.
Press the MODE button to confirm the refrigerant address
and unit number.
After a while, "- - " will start to blink in the mode number display area.
Example) When the refrigerant address is set to 00 and the unit number is 02.
00 refrigerant address
Outdoor unit
Mode number
display section
*
Indoor unit
"88" will blink in the room temperature display area if the selected refrigerant
address does not exist in the system.
Furthermore, if "F" appears and blinks in the unit number display area and the
refrigerant address display area also blinks, there are no units that correspond to the selected unit number. In this case, the refrigerant address and unit
number may be incorrect, so repeat steps and to set the correct ones.
Designate operation
*
Unit number 01
Unit number 02
Remote controller
Fan draft
When grouping different refrigerant systems, if an indoor unit other than the
one to which the refrigerant address has been set to perform fan operation,
there may be another refrigerant address that is the same as the specified one.
In this case, check the DIP switch of the outdoor unit to see whether such a
refrigerant address exists.
Select the mode number.
TEMP] buttons (
and
) to set the desired
Press the [
mode number.
(Only the selectable mode numbers can be selected.)
Select the setting content for the selected mode.
Press the MENU button. The currently selected setting number
will blink, so check the currently set content.
Setting number display section
Mode number
display section
Mode number 02 = Indoor temperature detection
Press the [
TEMP] buttons (
setting number.
Setting number 1 = Indoor unit operating average
Register the settings you have made in steps to .
Press the MODE button. The mode number and setting number
will start to blink and registration starts.
and
) to select the desired
Setting number 3 = Remote controller built-in sensor
The mode number and setting number will stop blinking and remain lit, indicating the
end of registration.
* If " - - - " is displayed for both the mode number and setting number and "
" blinks in the room temperature display area, a transmission error may have occurred.
Check to see if there are any sources of noise or interference near the transmission path.
If you wish to continue to select other functions, repeat steps to .
Complete function selection.
Hold down the FILTER (
mode is 15 to 28) and TEST
buttons simultaneously for at least 2 seconds.
After a while, the function selection screen will disappear and the air
conditioner OFF screen will reappear.
* Do not operate the remote controller for at least 30 seconds after completing
function selection. (No operations will be accepted even if they are made.)
Note
If a function of an indoor unit is changed by function selection after installation is complete, make sure that a " " mark, etc., is given in the "Check" column of Table
1 to indicate the change.
OCH512
78
12-1-2. Selecting functions using the IR wireless remote controller (Type C)
Functions can be selected with the IR wireless remote controller. Function selection using IR wireless remote controller is available only for
refrigerant system with wireless function. Refrigerant address cannot be specified by the IR wireless remote controller.
[Flow of function selection procedure]
The flow of the function selection procedure is shown below. This example shows how to turn
off the function that raises the set temperature by 4 degrees during HEAT operation.
The procedure is given after the flow chart.
Check the function selection setting.
CHECK
Switch to function selection mode.
(Enter address "50" in troubleshooting
mode, then press the HOUR button.)
TEMP
ON/OFF
MODE
FAN
AUTO STOP
VANE
AUTO START
CHECK LOUVER
h
min
TEST RUN
SET
Troubleshooting mode is the mode entered when
you press the CHECK button twice to display
"CHECK".
RESET
CLOCK
Specify unit No. "01" (since the function applies to unit 01).
(Set address "01" while still in troubleshooting mode, then press the MINUTE button.)
Note: You can't specify the refrigerant address.
NO
Select mode No. "24" (function that raises set temperature by 4 degrees during HEAT operation).
(Set address "24" while still in troubleshooting mode, then press the HOUR button.)
YES
Change
unit No.
Select setting No. "02" (OFF).
(Set address "02" while still in troubleshooting mode, then press the HOUR button.)
Finished
NO
YES
End function selection mode. Note: When you switch to function selection mode
on the IR wireless remote controller's operation
(End troubleshooting mode.)
area, the unit ends function selection mode
automatically if nothing is input for 10 minutes
or longer.
[Operating instructions]
1 Check the function settings.
CHECK
2 Press the
button twice continuously.
CHECK is lit and “00” blinks.
Press the temp
button once to set “50”. Direct the IR wireless remote controller toward the receiver of the indoor unit and press
h
the
button.
3 Set the unit number.
Press the temp
button to set the unit number. (Press “01” to specify the indoor unit whose unit number is 01.)
min
Direct the IR wireless remote controller toward the receiver of the indoor unit and press the
button.
min
By setting unit number with the
button, specified indoor unit starts performing fan operation.
Detect which unit is assigned to which number using this function. If unit number is set to AL, all the indoor units in same
refrigerant system start performing fan operation simultaneously.
* If a unit number that cannot be recognized by the unit is entered, 3 beeps of 0.4 seconds will be heard. Reenter the unit number
setting.
* If the signal was not received by the sensor, you will not hear a beep or a “double ping sound” may be heard. Reenter the unit number
setting.
4 Select a mode.
Press the temp
button to set a mode. Press “24” to turn on the function that raises the set temperature by 4 degree
h
during heat operation. Direct the IR wireless remote controller toward the sensor of the indoor unit and press the
button.
The sensor-operation indicator will blink and beeps will be heard to indicate the current setting number.
Current setting number: 1 = 1 beep (one second)
2 = 2 beeps (one second each)
3 = 3 beeps (one second each)
* If a mode number that cannot be recognized by the unit is entered, 3 beeps of 0.4 seconds will be heard. Reenter the mode
number.
* If the signal was not received by the sensor, you will not hear a beep or a “double ping sound” may be heard. Reenter the mode
number.
5 Select the setting number.
Press the temp
button to select the setting number. (02: Not available)
h
Direct the IR wireless remote controller toward the receiver of the indoor unit and press the
button.
The sensor-operation indicator will blink and beeps will be heard to indicate the setting number.
Setting number: 1 = 2 beeps (0.4 seconds each)
2 = 2 beeps (0.4 seconds each, repeated twice)
3 = 2 beeps (0.4 seconds each, repeated 3 times)
* If a setting number that cannot be recognized by the unit is entered, the setting will turn back to the original setting.
* If the signal was not received by the sensor, you will not hear a beep or a “double ping sound” may be heard. Reenter the setting number.
6 Repeat steps 4 and 5 to make an additional setting without changing unit number.
7 Repeat steps 3 to 5 to change unit number and make function settings on it.
8 Complete the function settings
Press
button.
* Do not use the IR wireless remote controller for 30 seconds after completing the function setting.
OCH512
79
12-2. FUNCTION SELECTION OF REMOTE CONTROLLER
The setting of the following remote controller functions can be changed using the remote controller function selection mode.
Change the setting when needed.
Item 1
Item 2
1.Change language
Language setting to display
("CHANGE LANGUAGE")
2.Function limit
(1) Operation function limit setting (operation lock) ("LOCKING FUNCTION")
("FUNCTION SELECTION") (2) Use of automatic mode setting ("SELECT AUTO MODE")
(3) Temperature range limit setting ("LIMIT TEMP FUNCTION")
3.Mode selection
(1) Remote controller main/sub setting ("CONTROLLER MAIN/SUB")
("MODE SELECTION")
(2) Use of clock setting ("CLOCK")
(3) Timer function setting ("WEEKLY TIMER")
(4) Contact number setting for error situation ("CALL.")
(1) Temperature display /°F setting ("TEMP MODE /°F")
4.Display change
("DISP MODE SETTING") (2) Room air temperature display setting ("ROOM TEMP DISP SELECT")
(3) Automatic cooling/heating display setting ("AUTO MODE DISP C/H")
Item 3 (Setting content)
• Display in multiple languages is possible.
• Setting the range of operation limit (operation lock)
• Setting the use or non-use of "automatic" operation mode
• Setting the temperature adjustable range (maximum, minimum)
• Selecting main or sub remote controller
* When two remote controllers are connected to one group, one controller must be set to sub.
• Setting the use or non-use of clock function
• Setting the timer type
• Contact number display in case of error
• Setting the telephone number
• Setting the temperature unit ( or °F) to display
• Setting the use or non-use of the display of indoor (room) air temperature
• Setting the use or non-use of the display of "Cooling" or "Heating" display during
operation with automatic mode
[Function selection flowchart] Refer to next page.
[1] Stop the air conditioner to start remote controller function selection mode. [2] Select from item1. [3] Select from item2. [4] Make the setting.
(Details are specified in item3) [5] Setting completed. [6] Change the display to the normal one. (End)
[Detailed setting]
[4] -1. CHANGE LANGUAGE setting
The language that appears on the dot display can be selected.
• Press the [ MENU] button to change the language.
Japanese (JP), English (GB), German (D), Spanish (E),
Russian (RU), Italian (I), Chinese (CH), French (F)
[4] -2. Function limit
(1) Operation function limit setting (operation lock)
• To switch the setting, press the [ ON/OFF] button.
no1 : All operation buttons except [ ON/OFF] button are
locked.
no2 : All operation buttons are locked.
OFF (Initial setting value) : Operation lock setting is not made
* To make the operation lock setting valid on the normal screen, it is
necessary to press buttons (Press and hold down the [FILTER]
and [ ON/OFF] buttons at the same time for 2 seconds.) on
the normal screen after the above setting is made.
.
(2) Use of automatic mode setting
When the remote controller is connected to the unit that has automatic operation mode, the following settings can be made.
• To switch the setting, press the [ ON/OFF] button.
ON (Initial setting value) : The automatic mode is displayed when
the operation mode is selected.
OFF
: The automatic mode is not displayed
when the operation mode is selected.
(3) Temperature range limit setting
After this setting is made, the temperature can be changed within the set range.
• To switch the setting, press the [ ON/OFF] button.
LIMIT TEMP COOL MODE :
The temperature range can be changed on cooling/dry mode.
LIMIT TEMP HEAT MODE :
The temperature range can be changed on heating mode.
LIMIT TEMP AUTO MODE :
The temperature range can be changed on automatic mode.
OFF (initial setting) : The temperature range limit is not active.
* When the setting, other than OFF, is made, the temperature range limit setting
on cooling, heating and automatic mode is made at the same time. However
the range cannot be limited when the set temperature range has not changed.
• To increase or decrease the temperature, press the [ TEMP ( ) or ( )] button.
• To switch the upper limit setting and the lower limit setting, press the [
]
button. The selected setting will flash and the temperature can be set.
• Settable range
Cooling/Dry mode : Lower limit: 19 ~ 30 , 67°F~87°F
Upper limit: 30 ~ 19 , 87°F~67°F
Heating mode :
Lower limit: 17 ~ 28 , 63°F~83°F
Upper limit: 28 ~ 17 , 83°F~63°F
Automatic mode : Lower limit: 19 ~ 28 , 67°F~83°F
Upper limit: 28 ~ 19 , 83°F~67°F
OCH512
[4] -3. Mode selection setting
(1) Remote controller main/sub setting
• To switch the setting, press the [ ON/OFF] button.
Main : The controller will be the main controller.
Sub : The controller will be the sub controller.
(2) Use of clock setting
• To switch the setting, press the [ ON/OFF] button.
ON : The clock function can be used.
OFF : The clock function cannot be used.
(3) Timer function setting
• To switch the setting, press the [ ON/OFF] button (Choose one
of the followings.).
WEEKLY TIMER (initial setting): The weekly timer can be used.
AUTO OFF TIMER: The auto off timer can be used.
SIMPLE TIMER: The simple timer can be used.
TIMER MODE OFF: The timer mode cannot be used.
* When the use of clock setting is OFF, the "WEEKLY TIMER" cannot
be used.
(4) Contact number setting for error situation
• To switch the setting, press the [ ON/OFF] button.
CALL OFF : The set contact numbers are not displayed in case of error.
CALL **** *** **** : The set contact numbers are displayed in case
of error.
CALL_
: The contact number can be set when the display is as
shown on the left.
• Setting the contact numbers
To set the contact numbers, follow the following procedures.
Move the flashing cursor to set numbers. Press the [ TEMP. ( ) and
( )] button to move the cursor to the right (left). Press the [ CLOCK
( ) and ( )] button to set the numbers.
[4] -4. Display change setting
(1) Temperature display /°F setting
• To switch the setting, press the [
ON/OFF] button.
: The temperature unit is used.
° F: The temperature unit °F is used.
(2) Room air temperature display setting
• To switch the setting, press the [ ON/OFF] button.
ON : The room air temperature is displayed.
OFF : The room air temperature is not displayed.
(3) Automatic cooling/heating display setting
• To switch the setting, press the [ ON/OFF] button.
ON : One of "Automatic cooling" and "Automatic heating" is displayed
under the automatic mode is running.
OFF : Only "Automatic" is displayed under the automatic mode.
80
[Function selection flowchart]
Setting language (English)
Normal display
(Display when the air conditioner is not running)
Hold down the button and press the button for 2 seconds.
Press the operation mode button.
Press theTIMER MENU button.
Press theTIMER ON/OFF button.
Hold down the button and press the button for 2 seconds.
Remote controller function selection mode
Item 1
Change
Language
Item 2
English
Dot display
German
Spanish
TEMP.
Russian
Italian
MENU
BACK
MONITOR/SET
CLEAR
Item 3
Operation lock setting is not used.
(Initial setting value)
OFF
no1
All operation buttons except On/Off button are locked.
no2
All operation buttons are locked.
The automatic mode is displayed when the operation
mode is selected. (Initial setting value)
ON
OPERATION
Function
selection
CHECK TEST
French
Japanese
FILTER
DAY
CLOCK
PAR-21MAA
Chinese
ON/OFF
ON/OFF
The automatic mode is not displayed when the operation mode
is selected.
OFF
The temperature range limit is not active. (Initial setting value)
OFF
The temperature range can be changed on cooling/dry mode
.
The temperature range can be changed on heating mode.
The temperature range can be changed on automatic mode.
Automatic filter elevation panel up/down operation mode
Not necessary to set this mode. Refer to OPERATION MANUAL of
Optional Parts (Panel) for details on operation.
Mode
selection
Fixed air flow direction mode
Not necessary to set this mode. Refer to OPERATION MANUAL of
indoor unit for details on operation.
The remote controller will be the main controller. (Initial setting value)
OFF
81
°C
Weekly timer can be used. (Initial setting value)
*
Auto off timer can be used.
*
Simple timer can be used.
*
Timer mode cannot be used.
The set contact numbers are not displayed in case of error.
(Initial setting value)
The set contact numbers are displayed in case of error.
The temperature unit °C is used.
Room air temperature is displayed. (Initial setting value)
OFF
OFF
*
The temperature unit °F is used.(Initial setting value)
ON
OCH512
CALL-
ON
°F
The clock function cannot be used.
OFF
Display
mode setting
The clock function can be used. (Initial setting value)
One of the
description
marked *
on the right
will be
displayed.
(current
setting)
The remote controller will be the sub controller.
ON
Room air temperature is not displayed.
One of “Automatic cooling” and “Automatic heating” is displayed
under the automatic mode is running. (Initial setting value)
Only “Automatic” is displayed under the automatic mode.
12-3. Function selection of IR wireless remote controller
TEMPERATURE DISPLAY °C/°F SETTING (Change of temp mode from °F to °C)
1 Press the set button with something sharp at the end. MODEL SELECT
2 Press the
3 Press the
AUTO START
blinks.
button. “F:” blinks.
button. “C:” blinks.
4 Press the set button with something sharp at the end. MODEL SELECT is lighted for 3 seconds, then turned off.
COOL
DRY
AUTO
FAN
HEAT
CHECK TEST
MODEL RUN
SELECT
FAN
°F
°C
STOP AMPM
SWING
START AMPM
NOT AVAILABLE
ON/OFF
TEMP
MODE
FAN
AUTO STOP
VANE
AUTO START
CHECK LOUVER
TEST RUN
OCH512
SET
h
min
RESET
CLOCK
82
13
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER
13-1. HOW TO "MONITOR THE OPERATION DATA"
•
Turn on the [Monitoring the operation data]
Example) Request code "004"
Discharge temperature 156°F
Refrigerant address "00"
(7)
(3)
(5)
(1)
(2) (6)
(4)
(1) Press the
TEST
A: Mode display
B: Refrigerant address
C: Data display area
D: Request code display area
button for 3 seconds so that [Maintenance mode] appears on the screen (at ).
(2) Press the CHECK button for 3 seconds to switch to [Maintenance monitor].
Note) It is not possible to switch to [Maintenance monitor] during data request in maintenance mode (i.e., while "- - - -" is blinking),
since no buttons are operative.
Operating the service inspection monitor
[ - - - ] appears on the screen (at ) when [Maintenance monitor] is activated.
(The display (at ) now allows you to set a request code No.)
and
) to select the desired refrigerant address.
(3) Press the [TEMP] buttons (
[Screen ]
(4) Press the [CLOCK] buttons (
and
) to set the desired request code No.
(5) Press the FILTER button to perform data request.
(The requested data will be displayed at in the same way as in maintenance mode.)
Data collected during operation of the remote controller will be displayed.
The collected data such as temperature data will not be updated automatically even if the data changes.
To display the updated data, carry out step (4) again.
Canceling the Monitoring the operation data
(6) While [Maintenance monitor] is displayed, press the
(7) To return to normal mode, press the
OCH512
CHECK
ON/OFF button.
83
button for 3 seconds to return to maintenance mode.
13-2. REQUEST CODE LIST
Request code
* Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed.
Description
Request content
(Display range)
Unit
0
Operation state
Refer to 13-2-1. Detail Contents in Request Code.
–
1
Compressor-Operating current (rms)
0 – 50
A
2
Compressor-Accumulated operating time
0 – 9999
10 hours
3
Compressor-Number of operation times
0 – 9999
100 times
4
Shell temperature (TH32)
37 ~ 327
°F
5
Outdoor unit - Liquid pipe 1 temperature (TH3)
-40 ~ 194
°F
6
Outdoor unit - Liquid pipe 2 temperature
-40 ~ 194
°F
7
Outdoor unit-2-phase pipe temperature (TH6)
-38 ~ 190
°F
9
Outdoor unit-Outside air temperature (TH7)
-38 ~ 190
°F
10
Outdoor unit-Heatsink temperature (TH8)
-40 ~ 327
°F
12
Discharge super heat (SHd)
0 – 327
°F
13
Sub-cool (SC)
0 – 234
°F
16
Compressor-Operating frequency
0 – 255
Hz
17
Compressor-Target operating frequency
0 – 255
Hz
18
Outdoor unit-Fan output step
0 – 10
Step
0 – 9999
rpm
0 – 9999
rpm
Remarks
8
11
14
15
19
20
Outdoor unit-Fan 1 speed
(Only for air conditioners with DC fan motor)
Outdoor unit-Fan 2 speed
(Only for air conditioners with DC fan motor)
"0" is displayed if the air conditioner is a single-fan
type.
21
22
LEV (A) opening
0 – 500
Pulses
23
LEV (B) opening
0 – 500
Pulses
25
Primary current
0 – 50
A
26
DC bus voltage
180 – 370
V
29
Number of connected indoor units
0–4
30
Indoor unit-Setting temperature
62 ~ 86
31
Indoor unit-Intake air temperature <Measured by thermostat> 46 ~ 102
24
27
28
32
33
34
35
Indoor unit-Intake air temperature (Unit No. 1)
Units
°F
°F
46 ~ 102
°F
<Heat mode-4-deg correction>
Indoor unit-Intake air temperature (Unit No. 2)
46 ~ 102
°F
<Heat mode-4-deg correction>
Indoor unit-Intake air temperature (Unit No. 3)
46 ~ 102
°F
<Heat mode-4-deg correction>
Indoor unit-Intake air temperature (Unit No. 4)
"0" is displayed if the target unit is not present.
46 ~ 102
°F
<Heat mode-4-deg correction>
36
37
Indoor unit - Liquid pipe temperature (Unit No. 1)
-38 ~ 190
°F
38
Indoor unit - Liquid pipe temperature (Unit No. 2)
-38 ~ 190
°F
39
Indoor unit - Liquid pipe temperature (Unit No. 3)
-38 ~ 190
°F
40
Indoor unit - Liquid pipe temperature (Unit No. 4)
-38 ~ 190
°F
42
Indoor unit-Cond./Eva. pipe temperature (Unit No. 1)
-38 ~ 190
°F
43
Indoor unit-Cond./Eva. pipe temperature (Unit No. 2)
-38 ~ 190
°F
44
Indoor unit-Cond./Eva. pipe temperature (Unit No. 3)
-38 ~ 190
°F
45
Indoor unit-Cond./Eva. pipe temperature (Unit No. 4)
-38 ~ 190
°F
48
Thermo ON operating time
0 – 999
Minutes
49
Test run elapsed time
0 – 120
Minutes
"0" is displayed if the target unit is not present.
41
"0" is displayed if the target unit is not present.
46
47
OCH512
84
Not possible to activate maintenance mode during the test run.
Request code
Description
Request content
Unit
(Display range)
50
Indoor unit-Control state
Refer to 13-2-1.Detail Contents in Request Code.
–
51
Outdoor unit-Control state
Refer to 13-2-1.Detail Contents in Request Code.
–
52
Compressor-Frequency control state
Refer to 13-2-1.Detail Contents in Request Code.
–
53
Outdoor unit-Fan control state
Refer to 13-2-1.Detail Contents in Request Code.
–
54
Actuator output state
Refer to 13-2-1.Detail Contents in Request Code.
–
55
Error content (U9)
Refer to 13-2-1.Detail Contents in Request Code.
–
56
57
58
59
60
Signal transmission demand capacity
0 – 255
%
61
Contact demand capacity
Refer to 13-2-1.Detail Contents in Request Code.
–
62
External input state (silent mode, etc.)
Refer to 13-2-1.Detail Contents in Request Code.
–
63
64
65
66
67
68
69
70
Outdoor unit-Capacity setting display
Refer to 13-2-1.Detail Contents in Request Code.
–
71
Outdoor unit-Setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
73
Outdoor unit-SW1 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
74
Outdoor unit-SW2 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
72
75
76
Outdoor unit-SW4 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
77
Outdoor unit-SW5 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
78
Outdoor unit-SW6 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
79
Outdoor unit-SW7 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
80
Outdoor unit-SW8 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
81
Outdoor unit-SW9 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
82
Outdoor unit-SW10 setting information
Refer to 13-2-1.Detail Contents in Request Code.
–
M-NET adapter connection (presence/absence)
"0000": Not connected
"0001": Connected
–
89
Display of execution of replace/wash operation
"0000": Not washed
"0001": Washed
–
90
Outdoor unit-Microprocessor version information
Examples) Ver 5.01
83
84
85
86
87
88
"0501"
Ver
Auxiliary information (displayed after
91
–
Outdoor unit-Microprocessor version information (sub No.) version information)
Examples) Ver 5.01 A000
"A000"
92
93
94
95
96
97
98
99
100 Outdoor unit - Error postponement history 1 (latest)
101 Outdoor unit - Error postponement history 2 (previous)
102 Outdoor unit - Error postponement history 3 (last but one)
OCH512
Displays postponement code. (" - - " is
displayed if no postponement code is present)
Displays postponement code. (" - - " is
displayed if no postponement code is present)
Displays postponement code. (" - - " is
displayed if no postponement code is present)
85
Code
Code
Code
Remarks
Request code
Description
Request content
(Display range)
Unit
103 Error history 1 (latest)
Displays error history. (" - - " is displayed if no history is present.)
Code
104 Error history 2 (second to last)
Displays error history. (" - - " is displayed if no history is present.)
Code
105 Error history 3 (third to last)
Displays error history. (" - - " is displayed if no history is present.)
Code
Remarks
3 : TH3
106
Abnormal thermistor display
(TH3/TH6/TH7/TH8)
6 : TH6
Sensor
7 : TH7
number
8 : TH8
0 : No thermistor error
107 Operation mode at time of error
Displayed in the same way as request code "0".
–
108 Compressor-Operating current at time of error
0 – 50
A
109 Compressor-Accumulated operating time at time of error 0 – 9999
10 hours
110 Compressor-Number of operation times at time of error 0 – 9999
100 times
111 Discharge temperature at time of error
37 ~ 327
°F
112 Outdoor unit - Liquid pipe 1 temperature (TH3) at time of error
-40 ~ 194
°F
113 Outdoor unit - Liquid pipe 2 temperature at time of error -40 ~ 194
°F
-38 ~ 190
°F
116 Outdoor unit-Outside air temperature (TH7) at time of error -38 ~ 190
°F
117 Outdoor unit-Heatsink temperature (TH8) at time of error -40 ~ 327
°F
114 Outdoor unit-2-phase pipe temperature (TH6) at time of error
115
°F
118 Discharge super heat (SHd) at time of error
0 – 327
119 Sub-cool (SC) at time of error
0 – 234
°F
120 Compressor-Operating frequency at time of error
0 – 255
Hz
0 – 10
Step
121
Outdoor unit at time of error
• Fan output step
Outdoor unit at time of error
0 – 9999
rpm
0 – 9999
rpm
125 LEV (A) opening at time of error
0 – 500
Pulses
126 LEV (B) opening at time of error
0 – 500
Pulses
0 – 999
Minutes
122
123
• Fan 1 speed (Only for air conditioners with DC fan)
Outdoor unit at time of error
• Fan 2 speed (Only for air conditioners with DC fan)
"0" is displayed if the air conditioner is a singlefan type.
124
127
128
129
130 Thermo ON time until operation stops due to error
131
Indoor - Liquid pipe temperature at time of error
-38 ~ 190
°F
-38 ~ 190
°F
-38 ~ 190
°F
150 Indoor-Actual intake air temperature
-38 ~ 190
°F
151 Indoor - Liquid pipe temperature
-38 ~ 190
°F
152 Indoor-Cond./Eva. pipe temperature
-38 ~ 190
°F
132
133
134
Indoor-Cond./Eva. pipe temperature at time of error
Indoor at time of error
• Intake air temperature <Thermostat judge temperature>
135
136
137
138
139
140
~
146
147
148
149
OCH512
86
Average value of all indoor units is displayed if the air conditioner consists of two or more indoor units (twin, triple, quad).
Average value of all indoor units is displayed if the air conditioner consists of two or more indoor units (twin, triple, quad).
Request code
Description
Request content
Unit
(Display range)
Remarks
153
154
155
Indoor-Fan operating time
(After filter is reset)
Indoor-Total operating time
(Fan motor ON time)
0 – 9999
1 hour
0 – 9999
10 hours
156
0 – 255
Fan control data
–
For indoor fan phase control
"00 **" "**" indicates fan control data.
–
For indoor fan pulsation control
"00 **" "**" indicates fan control data.
–
For indoor DC brushless motor control
162 Indoor unit-Model setting information
Refer to 13-2-1 Detail Contents in Request Code.
–
163 Indoor unit-Capacity setting information
Refer to 13-2-1 Detail Contents in Request Code.
–
164 Indoor unit-SW3 information
Undefined
–
165 Wireless pair No. (indoor control board side) setting
Refer to 13-2-1 Detail Contents in Request Code.
–
166 Indoor unit-SW5 information
Undefined
–
157 Indoor fan output value (Sj value)
158
Indoor fan output value
(Pulsation ON/OFF)
159 Indoor fan output value (duty value)
160
161
167
~
189
190 Indoor unit-Microprocessor version information
Examples) Ver 5.01
"0501"
191 Indoor unit-Microprocessor version information (sub No.) Auxiliary information (displayed after version information)
Examples) Ver 5.01 A000
"A000"
Ver
–
192
~
764
765 Stable operation (Heat mode)
This request code is not provided to collect data. It is used to fix the operation state.
766 Stable operation (Cool mode)
This request code is not provided to collect data. It is used to fix the operation state.
767 Stable operation cancellation
OCH512
This request code is not provided to collect data. It is used to cancel the operation state that has been
fixed by request codes "765" and "766".
87
13-2-1. Detail Contents in Request Code
Example) Request code "004"
Discharge temperature 156°F
Refrigerant address "00"
[Operation state] (Request code : "0")
Relay output state
Data display
Display
C
4
0
1
2
3
4
5
6
7
8
A
Relay output state
Operation mode
Operation mode
Display
0
C
H
d
A: Mode display
B: Refrigerant address
C: Data display area
D: Request code display area
Operation mode
STOP • FAN
COOL • DRY
HEAT
DEFROST
Power currently
supplied to compressor
–
Compressor
Four-way valve
Solenoid valve
–
–
–
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
[Indoor unit – Control state] (Request code : "50")
Data display
Unit No. 4 state
Unit No. 3 state
Unit No. 2 state
Unit No. 1 state
Display
0
1
2
3
4
5
6
7
F
State
Normal
Preparing for heat operation.
–
–
Heater is ON.
Anti-freeze protection is ON.
Overheat protection is ON.
Requesting compressor to turn OFF.
There are no corresponding units.
[Outdoor unit – Control state] (Request code : "51")
0
0
0
Data display
0
0
0
0
0
1
0
0
2
State
Normal
Preparing for heat operation.
Defrost
[Compressor – Frequency control state] (Request code : "52")
Frequency control state Data display
0
Display
0
Frequency control state Frequency control state Frequency control state Display
0
1
2
Current limit control
No current limit
Primary current limit control is ON.
Secondary current limit control is ON.
OCH512
0
1
2
3
4
5
6
7
8
9
A
b
C
d
E
F
Discharge temperature Condensation temperature
Anti-freeze
Heatsink temperature
overheat prevention
overheat prevention
protection control overheat prevention
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
88
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
[Fan control state] (Request code : "53")
Data display
0
0
Fan step correction value by heatsink temperature overheat prevention control
Fan step correction value by cool condensation temperature overheat prevention control
Display
- (minus)
0
1
2
Correction value
–1
0
+1
+2
[Actuator output state] (Request code : "54")
Data display
0
0
Actuator output state Actuator output state Actuator output state Display
SV1
0
1
ON
2
3
ON
4
5
ON
6
7
ON
8
9
ON
A
b
ON
C
d
E
F
Actuator output state Four-way valve
Compressor
Compressor is
warming up
ON
ON
ON
ON
ON
ON
ON
52C
0
1
ON
2
3
4
5
6
7
ON
ON
ON
ON
ON
SV2
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
[Error content (U9)] (Request code : "55")
Data display
0
0
Error content Error content Error content Display
Overvoltage
error
: Detected
Undervoltage
error
L1-phase
open error
Power synchronizing
signal error
0
1
2
3
4
5
6
7
8
9
A
b
C
d
E
F
OCH512
Error content Display
0
1
2
3
89
Converter Fo
error
SS
ON
ON
ON
ON
ON
ON
ON
ON
ON
Display
: Detected
PAM error
ON
ON
ON
ON
[Contact demand capacity] (Request code : "61")
Data display
0
0
Setting content
0
Setting content
Display
Setting value
0
1
2
3
0%
50%
75%
100%
Setting
SW7-1
SW7-2
ON
ON
ON
ON
Silent mode
input
Spare 1
input
[External input state] (Request code : "62")
Data display
0
0
Input state
0
Input state
Display
Contact demand
input
0
1
2
3
4
5
6
7
8
9
A
b
C
d
E
F
[Outdoor unit – Capacity setting display] (Request code : "70")
Data display
9
10
11
14
20
25
Capacity
12
18
24
30
36
42
[Outdoor unit – Setting information] (Request code : "71")
Data display
0
0
Setting information Setting information Setting information Display
Defrost mode
0
Standard
1
For high humidity
Setting information Single-/
Display
3-phase
0
Single-phase
1
2
3-phase
3
OCH512
90
Heat pump/
cooling only
Heat pump
Cooling only
Heat pump
Cooling only
: Input present
Spare 2
input
[Outdoor unit switch setting display (SW1 to SW10, except SW3)] Request codes : 73 to 82
0: Switch OFF
1: Switch ON
SW1, SW2, SW6, SW7
Data display
1
2
3
4
5
6
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
OCH512
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
01
02
03
04
05
06
07
08
09
0A
0b
0C
0d
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
0: Switch OFF
1: Switch ON
SW5
Data display
1
2
3
4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0: Switch OFF
SW8
1
2
3
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
01
02
03
04
05
06
07
08
09
0A
0b
0C
0d
0E
0F
1: Switch ON
Data display
0
0
0
0
1
1
1
1
00
00
00
00
00
00
00
00
00
01
02
03
04
05
06
07
0: Switch OFF
1: Switch ON
SW4, SW9, SW10
Data display
1
2
0
1
0
1
0
0
1
1
91
00
00
00
00
00
01
02
03
[Indoor unit – Model setting information] (Request code : 162)
Data display
0
Display
0
See the table on the right.
Model setting state
00
01
02
03
04
05
06
07
08
09
0A
0b
0C
0d
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1b
1C
1d
1E
1F
Display
20
21
22
23
24
25
26
27
28
29
2A
2b
2C
2d
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3b
3C
3d
3E
3F
Model setting state
PLA-A·BA
PCA-A·KA
[Indoor unit – Capacity setting information] (Request code : 163)
Data display
0
Display
0
See the table on the right.
Capacity setting state
00
01
02
03
04
05
06
07
08
09
0A
0b
0C
0d
0E
0F
12
18
24
30
36
[Wireless pair No. (indoor control board side) setting] (Request code : 165)
Data display
0
Display
0
See the table on the right.
OCH512
00
01
02
03
Pair No. setting state
No.
No.
No.
No.
0
1
2
3
92
J41 disconnected
J42 disconnected
J41, J42 disconnected
Display
Capacity setting state
10
11
12
13
14
15
16
17
18
19
1A
1b
1C
1d
1E
1F
42
14
DISASSEMBLY PROCEDURE
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
PHOTOS & ILLUSTRATION
OPERATING PROCEDURE
1. Removing the service panel and top panel
(1) Remove 3 service panel fixing screws (5 × 12) and slide
the hook on the right downward to remove the service
panel.
(2) Remove screws (3 for front, 3 for rear/5 × 12) of the top
panel and remove it.
Figure 1
Top panel fixing screws
Top panel
Service panel
Grille fixing
screws
Slide
Fan grille
Grille fixing
screws
2. Removing the fan motor (MF1, MF2)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 5 fan grille fixing screws (5 × 12) to detach the
fan grille. (See Figure 1)
(4) Remove a nut (for right handed screw of M6) to detach
the propeller. (See Photo 1)
(5) Disconnect the connectors, CNF1, CNF2 on controller
circuit board in electrical parts box.
(6) Remove 4 fan motor fixing screws (5 × 20) to detach the
fan motor. (See Photo 2)
Service panel
fixing screws
Photo 1
Front panel Photo 2
Propeller
Fan motor fixing screws
Fan
motor
Nut
Fan motor fixing screws
3. Removing the electrical parts box
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the indoor/outdoor connecting wire from
terminal block.
(4) Remove all the following connectors from controller circuit
board;
fan motor, linear expansion valve, thermistor <Outdoor pipe>,
thermistor <Shell>, thermistor <Outdoor 2-phase pipe>,
thermistor <Outdoor>, high pressure switch, 4-way valve coil.
Pull out the disconnected wire from the electrical parts
box.
<Diagram symbol in the connector housing>
• Fan motor (CNF1, CNF2)
• Linear expansion valve (LEV-A)
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Shell> (TH32)
• Thermistor <Outdoor 2-phase pipe, Outdoor> (TH6/7)
• High pressure switch (63H)
• 4-way valve coil (21S4)
(5) Remove the terminal cover and disconnect the compressor
lead wire.
(6) Remove an electrical parts box fixing screw (4 × 10) and
detach the electrical parts box by pulling it upward. The
electrical parts box is fixed with 2 hooks on the left and 1
hook on the right.
Photo 3
Controller circuit
board (C.B.)
Electrical
parts box
Electrical parts
box fixing screw
Terminal block
(TB1)
Valve bed
Compressor
(MC)
Terminal cover
Cover panel
(Front)
Cover panel fixing screws
OCH512
93
PHOTOS
OPERATING PROCEDURE
4. Removing the thermistor <Outdoor 2-phase pipe> (TH6)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the connectors, TH6 and TH7 (red), on the
controller circuit board in the electrical parts box.
(4) Loosen the clamp for the lead wire in the rear of the
electrical parts box.
(5) Pull out the thermistor <Outdoor 2-phase pipe> (TH6)
from the sensor holder.
Photo 4
Controller
circuit board
(C.B.)
Electrical
parts box
Thermistor
<Outdoor 2-phase pipe>
(TH6)
Note: In case of replacing thermistor <Outdoor 2-phase
pipe> (TH6), replace it together with thermistor
<Outdoor> (TH7) since they are combined together.
Refer to No.5 below to remove thermistor <Outdoor>.
Clamp
5. Removing the thermistor <Outdoor> (TH7)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the connector TH7 (red) on the controller circuit
board in the electrical parts box.
(4) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 4)
(5) Pull out the thermistor <Outdoor> (TH7) from the sensor
holder.
Photo 5
Note: In case of replacing thermistor <Outdoor> (TH7),
replace it together with thermistor <Outdoor 2-phase
pipe> (TH6), since they are combined together.
Refer to No.4 above to remove thermistor
<Outdoor 2-phase pipe>.
Lead wire of thermistor
<Outdoor> (TH7)
6. Removing the thermistor <Outdoor pipe> (TH3) and
thermistor <Shell> (TH32)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connectors, TH3 (white) and TH32 (black),
on the controller circuit board in the electrical parts box.
(3) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 4)
(4) Pull out the thermistor <Outdoor pipe> (TH3) and
thermistor <Shell> (TH32) from the sensor holder.
Photo 6
Sensor holder
Thermistor
<Outdoor pipe>
(TH3)
Thermistor
<Shell> (TH32)
Compressor
(MC)
OCH512
94
PHOTOS
OPERATING PROCEDURE
7. Removing the 4-way valve coil (21S4),
and linear expansion valve coil (LEV-A)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
[Removing the 4-way valve coil]
(3) Remove 4-way valve coil fixing screw (M4 × 6).
(4) Remove the 4-way valve coil by sliding the coil toward you.
(5) Disconnect the connector 21S4 (green) on the controller
circuit board in the electrical parts box.
[Removing the linear expansion valve coil]
(3) Remove the linear expansion valve coil by sliding the coil
upward.
(4) Disconnect the connectors, LEV-A (white), on the
controller circuit board in the electrical parts box.
Photo 7
Linear expansion
valve coil (LEV-A)
8. Removing the 4-way valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 3 valve bed fixing screws (4 × 10), 4 ball valve
and stop valve fixing screws (5 × 16), then remove the
valve bed.
(4) Remove 4 right side panel fixing screw (5 × 12) in the
rear of the unit and then remove the right side panel.
(5) Remove the 4-way valve coil. (See Photo 7)
(6) Recover refrigerant.
(7) Remove the welded part of 4-way valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by removing the right side panel.
Note 3: When installing the 4-way valve, cover it with a
wet cloth to prevent it from heating (250˚F or more),
then braze the pipes so that the inside of pipes
4-way valve coil
are not oxidized.
fixing screw
9. Removing linear expansion valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 3 valve bed fixing screws (4 × 10), 4 ball valve
and stop valve fixing screws (5 × 16), then remove the
valve bed.
(4) Remove 4 right side panel fixing screw (5 × 12) in the
rear of the unit and then remove the right side panel.
(5) Remove the linear expansion valve. (See Photo 7)
(6) Recover refrigerant.
(7) Remove the welded part of linear expansion valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by removing the right side panel.
Note 3: When installing the linear expansion valve, cover
it with a wet cloth to prevent it from heating
(250˚F or more), then braze the pipes so that the
inside of pipes are not oxidized.
OCH512
95
4-way way
valve coil
4-way valve
Linear expansion
valve
OPERATING PROCEDURE
PHOTOS
10. Removing the high pressure switch (63H)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 3 right side panel fixing screws (5 × 12) in the rear
of the unit and remove the right side panel.
(4) Pull out the lead wire of high pressure switch.
(5) Recover refrigerant.
(6) Remove the welded part of high pressure switch.
Photo 8
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by removing the right side panel.
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (210°F
or more), then braze the pipes so that the inside of
pipes are not oxidized.
High pressure
switch (63H)
11. Removing the reactor (DCL) and capacitor (CE)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
<Removing the reactor>
(4) Remove 4 reactor fixing screws (4 × 10) and remove the
reactor.
<Removing the capacitor>
(4) Remove 2 capacitor band fixing screws (4 × 10) and
remove the capacitor.
w The reactor and capacitor is attached to the rear of the electrical parts box.
Photo 9
Reactor
(DCL)
Reactor
fixing
screws
Reactor
fixing
screws
Capacitor (CE)
OCH512
96
Electrical parts box
Capacitor band
fixing screws
OPERATING PROCEDURE
PHOTOS
12. Removing the compressor (MC)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 2 front cover panel fixing screws (5 × 12) and
remove the front cover panel. (See Photo 3)
(4) Remove 2 back cover panel fixing screws (5 × 12) and
remove the back cover panel.
(5) Remove the electrical parts box. (See Photo 3)
(6) Remove 3 valve bed fixing screws (4 × 10), 4 ball valve and
stop valve fixing screws (5 × 16), then remove the valve bed.
(7) Remove 3 right side panel fixing screw (5 × 12) in the rear
of the unit and then remove the right side panel.
(8) Remove 3 separator fixing screws (4 × 10) and remove the
separator.
(9) Recover refrigerant.
(10) Remove the 3 points of the motor for compressor fixing
nut using spanner or adjustable wrench.
(11) Remove the welded pipe of motor for compressor inlet
and outlet and then remove the compressor.
Photo 10
Valve bed
Valve bed
fixing screws
Accumulator
Separator
Compressor
(MC)
Note: Recover refrigerant without spreading it in the air.
Separator
fixing screw
Compressor
fixing nut
13. Removing the accumulator
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 2 front cover panel fixing screws (5 × 12) and
remove the front cover panel. (See Photo 3)
(4) Remove 2 back cover panel fixing screws (5 × 12) and
remove the back cover panel.
(5) Remove the electrical parts box. (See Photo 3)
(6) Remove 3 valve bed fixing screws (4 × 10), 4 ball valve and
stop valve fixing screws (5 × 16), then remove the valve bed.
(7) Remove 3 right side panel fixing screw (5 × 12) in the rear
of the unit and then remove the right side panel.
(8) Recover refrigerant.
(9) Remove 2 welded pipes of accumulator inlet and outlet.
(10) Remove 2 accumulator leg fixing screws (4 × 10).
Photo 11
Inlet
Outlet
Accumulator
Note: Recover refrigerant without spreading it in the air.
Accumulator
leg
Compressor
(MC)
OCH512
97
Accumulator leg
fixing screws
TM
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
CCopyright 2012 MITSUBISHI ELECTRIC CORPORATION
Distributed in Apr. 2012 No.OCH512
Made in Japan
New publication, effective Apr. 2012
Specifications are subject to change without notice.
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