Mitsubishi Electric | PUY-A.NHA-BS | Service manual | Mitsubishi Electric PUY-A.NHA-BS Service manual

Mitsubishi Electric PUY-A.NHA-BS Service manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
October 2007
No. OCH420
REVISED EDITION-A
SERVICE MANUAL
Indoor unit
[Model names]
PLA-A12BA
PLA-A18BA
PLA-A24BA
PLA-A30BA
PLA-A36BA
PLA-A42BA
[Service Ref.]
Revision:
PLA-A12BA
PLA-A18BA
PLA-A24BA
PLA-A30BA
PLA-A36BA
PLA-A42BA
• PLA-A12/18/24/30/36/42BA1
are added in REVISED
EDITION-A.
• Some descriptions have been
modified.
PLA-A12BA1
PLA-A18BA1
PLA-A24BA1
PLA-A30BA1
PLA-A36BA1
PLA-A42BA1
• Please void OCH420.
NOTE:
• This manual describes only
service data of the indoor units.
• RoHS compliant products have
<G> mark on the spec name
plate.
CONTENTS
1. TECHNICAL CHANGES .......................... 2
2. REFERENCE MANUAL........................... 2
3. SAFETY PRECAUTION........................ 3
4. PART NAMES AND FUNCTIONS ........ 5
5. SPECIFICATIONS ................................. 8
6. NOISE CRITERION CURVES............. 10
7. OUTLINES AND DIMENSIONS ............12
8. WIRING DIAGRAM ................................ 13
9. REFRIGERANT SYSTEM DIAGRAM ...... 15
10. TROUBLESHOOTING ........................ 16
11. SPECIAL FUNCTION.......................... 31
12. DISASSEMBLY PROCEDURE ........... 34
Model name
indication
INDOOR UNIT
ON/OFF
TEMP
TEMP.
WIRELESS REMOTE
CONTROLLER
ON/OFF
WIRED REMOTE
CONTROLLER
PARTS CATALOG (OCB420)
33223
1
TECHNICAL CHANGES
PLA-A12BA
PLA-A18BA
PLA-A24BA
PLA-A30BA
PLA-A36BA
PLA-A42BA
PLA-A12BA1
PLA-A18BA1
PLA-A24BA1
PLA-A30BA1
PLA-A36BA1
PLA-A42BA1
INDOOR CONTROLLER BOARD(I.B) has been changed(11. SPECIAL FUNCTION is added).
2
REFERENCE MANUAL
2-1. OUTDOOR UNIT SERVICE MANUAL
Service Manual No.
Service Ref.
PUZ-A18/24/30/36/42NHA
PUZ-A18/24/30/36/42NHA-BS
PUY-A12/18/24/30/36/42NHA(1)
PUY-A12/18/24/30/36/42NHA(1)-BS
OC367
PUZ-HA36NHA
OCH426
OCB426
2-2. TECHNICAL DATA BOOK
Data Book No.
Series (Outdoor unit)
PUZ-A·NHA(-BS)
PUY-A·NHA(-BS)
OCS04
2
3
SAFETY PRECAUTION
3-1. ALWAYS OBSERVE FOR SAFTY
Before obtaining access to terminal, all supply
circuits must be disconnected.
3-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilising refrigerant R410A
Use new refrigerant pipes.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.
Make sure that the inside and outside of refrigerant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Contamination inside refrigerant piping can cause deterioration of refrigerant oil etc.
Store the piping to be used during installation
indoors and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
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
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
Keep the tools with care.
If large amount of mineral oil enters, that can cause deterioration of refrigerant oil etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
Charge refrigerant from liquid phase of gas
cylinder.
Do not use a charging cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in the 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.
3
[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.
Tool name
Gauge manifold
Specifications
·Only for R410A
·Use the existing fitting specifications. (UNF1/2)
·Use high-tension side pressure of 5.3MPa·G or over.
Charge hose
·Only for R410A
·Use pressure performance of 5.09MPa·G or over.
Electronic scale
Gas leak detector
·Use the detector for R134a, R407C or R410A.
Adaptor for reverse flow check
·Attach on vacuum pump.
Refrigerant charge base
Refrigerant cylinder
·Only for R410A
·Top of cylinder (Pink)
·Cylinder with syphon
Refrigerant recovery equipment
4
4
PART NAMES AND FUNCTIONS
Drain pipe
Filter
Air outlet
Liquid pipe
Gas pipe
i-see sensor
(option)
Vane
Air intake
(Intake grille)
5
LWiredremote controller
Display Section
“Sensor” indication
Day-of-Week
Displayed when the remote controller
sensor is used.
Shows the current day of the week.
For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.
Time/Timer Display
“Locked” indicator
Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, the time to be
switched off is shown.
Indicates that remote controller buttons have been locked.
Identifies the current operation
“Clean The Filter” indicator
Shows the operating mode, etc.
*Multilanguage display is available.
To be displayed on when it is time to
clean the filter.
TIME SUN MON TUE WED THU FRI SAT
TIMER
Hr
ON
AFTER
FUNCTION
FILTER
°F°C
°F°C
“Centrally Controlled” indicator
Indicates that operation from the
remote controller has been prohibited by a master controller.
Timer indicators
AFTER OFF
ERROR CODE
The indicator comes on if the corresponding timer is set.
WEEKLY
SIMPLE
AUTO OFF
ONLY1Hr.
Fan Speed indicator
Shows the selected fan speed.
“Timer is Off” indicator
Indicates that the timer is off.
Up/Down Air Direction indicator
The indicator shows the direction of the outcoming airflow.
Room Temperature display
Shows the room temperature. The room
temperature display range is 46–102˚F.
The display blinks if the temperature
is less than 46˚F or 102˚F or more.
Ventilation indicator
Appears when the unit is running in
Ventilation mode.
“One Hour Only” indicator
Temperature Setting
Shows the target temperature.
Louver display
Displayed if the airflow is set to
low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in 1 hour,
when the airflow direction
also changes.
Indicates the action of the swing louver.
Does not appear if the louver is not
running.
(Power On indicator)
Indicates that the power is on.
Operation Section
ON/OFF button
Temperature setting buttons
Down
Fan Speed button
Up
Timer Menu button
(Monitor/Set button)
Filter
button
(<Enter> button)
Mode button (Return button)
TEMP.
ON/OFF
Set Time buttons
Check button (Clear button)
Back
Ahead
Test Run button
MENU
BACK
MONITOR/SET
ON/OFF
FILTER
DAY
CHECK TEST
Airflow Up/Down button
Timer On/Off button
(Set Day button)
PAR-21MAA
OPERATION
CLOCK
CLEAR
Louver button
(
Operation button)
To return operation
number
Opening the
lid
Ventilation button
( Operation button)
Built-in temperature sensor
To go to next operation
number
Note:
WAIT” message
• “PLEASE
This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.
AVAILABLE” message
• “NOT
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.
6
LWirelessremote controller
CHECK TEST RUN display
Indicate that the unit is being checked or
test-run.
MODEL SELECT display
display
Blinks when model is selected.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.
Temperature setting display
Indicates the desired temperature setting
which is set.
CLOCK display
OPERATION MODE display
Displays the current time.
OPERATION MODE display
Indicates which operation mode is in effect.
COOL
DRY
AUTO
FAN
HEAT
display
The vertical direction of airflow is indicated.
TIMER display
CHECK TEST
MODEL RUN
SELECT
FAN
°F
°C
STOP AMPM
Displays when in timer operation or when
setting timer.
“” “
SWING
START AMPM
NOT AVAILABLE
ON/OFF
“
TEMP
” display
Displays the order of timer operation.
”“
” display
Displays whether timer is on or off.
display
button
Displays selected fan speed.
Sets any desired room temperature.
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
MODE
FAN
AUTO STOP
VANE
AUTO START
TIMER CONTROL buttons
FAN SPEED SELECT button
CHECK LOUVER
h
Changes the fan speed.
TEST RUN
min
MODE SELECT button
Switches the operation mode between
COOLING/DRY/FAN/HEATING and AUTO
mode.
SET
RESET
AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be
automatically stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.
CLOCK
"h" and "min" buttons
+In case the outdoor unit is cooling only
type, the heating and auto mode are not
available.
Buttons used to set the “hour and minute” of
the current time and timer settings.
LOUVER button
CHECK-TEST RUN button
Changes left / right airflow direction.
(Not available for this model.)
Performs an inspection
check or test
operation. Do not use it for normal
operation.
CLOCK button
VANE CONTROL button
RESET button
Changes the air flow direction.
SET button
7
INDOOR UNIT
INDOOR UNIT
INDOOR UNIT
5
SPECIFICATIONS
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan
Fan (drive) % No.
Fan motor output
Fan motor
Airflow (Low-Medium2-Medium1-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
W
D
H
Weight
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan
Fan (drive) % No.
Fan motor output
Fan motor
PLA-A12BA, PLA-A12BA1
Single phase,60Hz, 208/230V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) % 1
0.05
0.51
Dry: 11-12-13-15(390-420-460-530)
Wet: 10-11-12-14(350-390-420-490)
0(direct blow)
–
Remote controller & built-in
27-28-29-31
32 (1-1/4)
PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16)
PANEL : 35 (1-3/8)
UNIT : 258 (10-3/16)
PANEL: 6 (13)
UNIT : 22 (49)
A
A
kW
F.L.A.
*/min(CFM)
Pa(mmAq)
kW
dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
PLA-A18BA, PLA-A18BA1
Single phase,60Hz, 208/230V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) % 1
0.05
0.51
Dry: 12-14-16-18(420-490-570-640)
Wet:11-13-15-17(390-460-530-600)
0(direct blow)
–
Remote controller & built-in
28-29-31-32
32 (1-1/4)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
PANEL : 35 (1-3/8)
UNIT : 258 (10-3/16)
PANEL: 6 (13)
UNIT : 22 (49)
A
A
kW
F.L.A.
Airflow (Low-Medium2-Medium1-High) */min(CFM)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
W
D
H
Weight
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan
Fan (drive) % No.
Fan motor output
Fan motor
Pa(mmAq)
kW
dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
PLA-A24BA, PLA-A24BA1
Single phase,60Hz, 208/230V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) % 1
0.05
0.51
Dry: 12-14-16-18(420-490-570-640)
Wet: 11-13-15-17(390-460-530-600)
0(direct blow)
–
Remote controller & built-in
28-29-31-32
32(1-1/4)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16)
PANEL : 35 (1-3/8)
UNIT : 23 (51)
PANEL: 6 (13)
A
A
kW
F.L.A.
Airflow (Low-Medium2-Medium1-High) */min(CFM)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
W
D
H
Weight
Pa(mmAq)
kW
dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
8
INDOOR UNIT
INDOOR UNIT
INDOOR UNIT
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan
Fan (drive) % No.
Fan motor output
Fan motor
PLA-A30BA, PLA-A30BA1
Single phase,60Hz, 208/230V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) % 1
0.05
0.51
Dry: 14-16-18-21(490-570-640-740)
Wet: 13-15-17-20(460-530-600-710)
0(direct blow)
–
Remote controller & built-in
28-30-32-34
32(1-1/4)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16)
PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16)
PANEL : 35 (1-3/8)
UNIT : 23 (51)
PANEL: 6 (13)
A
A
kW
F.L.A.
Airflow (Low-Medium2-Medium1-High) */min(CFM)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
W
D
H
Weight
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan
Fan (drive) % No.
Fan motor output
Fan motor
Pa(mmAq)
kW
dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
PLA-A36BA, PLA-A36BA1
Single phase,60Hz, 208/230V
15
2
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) % 1
0.12
1.00
Dry: 20-23-26-30(710-810-920-1060)
Wet: 19-22-25-29(670-770-880-1030)
0(direct blow)
–
Remote controller & built-in
32-34-37-40
32(1-4)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 298 (11-3/4) PANEL : 35 (1-3/8)
UNIT : 25 (55)
PANEL : 6 (13)
A
A
kW
F.L.A.
Airflow (Low-Medium2-Medium1-High) */min(CFM)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
W
D
H
Weight
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan
Fan (drive) o No.
Fan motor output
Fan motor
Pa(mmAq)
kW
dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
PLA-A42BA, PLA-A42BA1
Single phase,60Hz, 208/230V
15
2
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) % 1
0.12
1.00
Dry: 22-25-28-31(780-880-990-1090)
Wet: 21-24-27-30(740-850-950-1060)
0(direct blow)
–
Remote controller & built-in
34-36-39-41
32(1-1/4)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 298 (11-3/4) PANEL : 35 (1-3/8)
UNIT : 25 (55)
PANEL : 6 (13)
A
A
kW
F.L.A.
Airflow (Low-Medium2-Medium1-High) */min(CFM)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
W
D
H
Weight
Pa(mmAq)
kW
dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
9
6
NOISE CRITERION CURVES
PLA-A12BA
PLA-A12BA1
NOTCH SPL(dB)
High
31
Medium1
29
Medium2
28
Low
27
LINE
PLA-A18BA
PLA-A18BA1
90
bar)
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
bar)
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
80
63
125
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
250
500
1000
2000
4000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
PLA-A24BA
PLA-A24BA1
63
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
NOTCH SPL(dB)
High
32
Medium1
31
Medium2
29
Low
28
LINE
PLA-A30BA
PLA-A30BA1
90
NOTCH SPL(dB)
High
34
Medium1
32
Medium2
30
Low
28
LINE
bar)
90
80
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
125
250
500
1000
2000
4000
8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
80
70
20
NC-20
10
8000
BAND CENTER FREQUENCIES, Hz
bar)
LINE
90
10
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
NOTCH SPL(dB)
High
32
Medium1
31
Medium2
29
Low
28
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
BAND CENTER FREQUENCIES, Hz
125
250
500
1000
2000
BAND CENTER FREQUENCIES, Hz
10
4000
8000
PLA-A36BA
PLA-A36BA1
NOTCH SPL(dB)
High
40
Medium1
37
Medium2
34
Low
32
PLA-A42BA
PLA-A42BA1
LINE
bar)
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
LINE
90
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
bar)
90
NOTCH SPL(dB)
High
41
Medium1
39
Medium2
36
Low
34
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
125
250
500
1000
2000
4000
8000
63
125
BAND CENTER FREQUENCIES, Hz
250
500
1000
2000
BAND CENTER FREQUENCIES, Hz
UNIT
CEILING
5ft
MICROPHONE
11
4000
8000
OUTLINES AND DIMENSIONS
PLA-A24BA
PLA-A24BA1
Air intake hole
(83)
(36)
3-17/64
1-27/64
Vane motor
(83)
Indoor unit
Ceiling
Grille
Min.94-1/2(2400)
from floor
Min.19-11/16(500)
Entire
periphery
Floor
6-9/16(167)
Cut out hole
:3-15/16(:100)
(35)
++
1-3/8
(17+5
0 )
120°
+
Ceiling
In case of standard grille
In case of wireless remote controller
Emergency operation switch<Cooling>
Emergency operation switch<Heating>
DEFROST/STAND BY lamp
Receiver
Operation lamp
PLA-A24BA
PLA-A30BA
1-27/64
3-17/64
Burring hole pitch
:4-29/32(:125)
120°
Keep 25/64(10)to 19/32(15)
between unit ceiling
and ceiling slab.
Models
19-11/16 (500)
Air outlet hole
37-3/8 (950)
3-15/16 (100)
5-1/8 (130)
(7.5)
33-27/32 to 35-13/16 (860~910)
70˚
Burring hole
1
PLA-A12BA Refrigerant pipe
PLA-A18BA ····:6.35
Flared connection
····1/4 inch
M
Corner pocket
(:150)
Auto vane
(Air outlet)
Air intake grille
M
Burring hole
3-:1/8(3-:2.8)
23-1/2 (597)
Air intake hole
Air outlet hole
19-11/16 (500)
M
14-:1/8 (14-:2.8)
(350)
Detail drawing of fresh air intake hole
)
Drain hole
Drain pump clean hole
and Drain emergency
drainage hole
M
37-3/8 (950)
7-15/32
23-1/2 (597)
+3/16
Ceiling
Grille
11/16 0
(50~70)
+
Suspension bolt
lower edge
13-25/32
Cut out hole
+
1-15/16~2-3/4
5-1/2
+ +
(140)
+
(170)
6-11/16
2
1-25/32
(20~45)
25/32 to
14-27/32
Branch duct hole
( 158)
11-3/16
A
(
(377)
(284)
2-3/8
+ +
(:175) :6-7/8
Burring hole pitch
Drain pipe
connected to VP-25
Connected the attached
flexible pipe or socket.
4-1/8 (105)
(60)
1
3-17/32 (90)
Cut out hole
6-9/64 (156)
(160)
33-1/16 (840)
3-15/16 (100)
3-15/16 (100)
3-17/32 (90)
:5-29/32
6-5/16
7-3/8
(187.5)
Suspension bolt
M10 or W3/8
Detail connecting of Branch duct(Both aspects)
25/32
to 1-25/32
(20~45)
C
D
(5/16)
For wiring replacement kit
terminal block
24-13/32 (620)
Indoor unit/Outdoor unit
connecting terminal block
3-17/32 (90)
5-29/32(150)
33-1/16(840)
For MA-Remote controller
terminal block
(7.5)
15/16 (24)
6-5/16 (160)
Suspension bolt pitch
+35
23-13/16 -3/16
+1-3/8 (605 -5 )
6-5/16
(160)
(5/16)
(160)
Branch duct hole
Unit : inch(mm)
Ceiling hole
6-5/16
PLA-A42BA
PLA-A42BA1
25/32 to 1-25/32(20~45)
31-7/8(810)
Suspension bolt pitch
B
Fresh air
intake hole
PLA-A36BA
PLA-A36BA1
6-3/32 (155)
Ceiling hole
33-27/32 to 35-13/16(860~910)
25/32 to 1-25/32(20~45)
PLA-A30BA
PLA-A30BA1
6-7/32
INDOOR UNIT
PLA-A12BA PLA-A18BA
PLA-A12BA1 PLA-A18BA1
(190)
7
(36)
PLA-A36BA
PLA-A42BA
2
A
B
C
D
Refrigerant pipe
····:12.7
Flared connection
9-1/2 10-3/16 3-5/32 2-29/32
····1/2 inch
(241) (258) (80) (74)
Refrigerant pipe
····:9.52
Flared connection
····3/8 inch
Refrigerant pipe
····:15.88
Flared connection
····5/8 inch
11-1/16 11-3/4 3-11/32 3-1/32
(281) (298) (85)
(77)
Note1. As for drain pipe, please use VP-25(O.D. :1-1/4(:32) PVC TUBE).
Drain pump is included.
Max. liftng height is 70-7/18(850mm) from the ceiling.
2. As for suspension bolt, please use M10 or W3/8.(Procured at local site)
3. Electrical box may be removed for the service purpose.
Make sure to slack the electrical wire little bit for control/power wires connection.
4. The height of the indoor unit is able to be adjusted with the grille attached.
5. For the installation of the optional high efficiency filter or optional multi-functional casement.
1) Add 5-5/16(135mm)to the dimensions + marked on the figure.
2) The optional high efficiency filter becomes optional multi-functional casement and
concomitant use.
6. When installing the branch ducts, be sure to insulate adequately.
Otherwise condensation and dripping may occur.
(It becomes the cause of dew drops/water dew.)
7. As for necessary installation/service space, please refer to the left figure.
12
8
WIRING DIAGRAM
INDOOR UNIT
PLA-A12BA PLA-A18BA
PLA-A24BA
PLA-A30BA
PLA-A36BA
PLA-A42BA
[LEGEND]
SYMBOL
I.B
CN2L
CN32
CN41
CN51
DSA
FUSE
LED1
LED2
LED3
SW1
SW2
SWE
X1
ZNR01,02
DP
FS
NAME
INDOOR CONTROLLER BOARD
CONNECTOR (LOSSNAY)
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
SURGE ABSORBER
FUSE (T6.3AL250V)
POWER SUPPLY (I.B)
POWER SUPPLY (R.B)
TRANSMISSION (INDOOR-OUTDOOR)
SWITCH (MODEL SELECTION) + See table 1
SWITCH (CAPACITY CODE) + See table 2
CONNECTOR (EMERGENCY OPERATION)
RELAY (DRAIN PUMP)
VARISTOR
DRAIN-UP MACHINE
DRAIN FLOAT SWITCH
<Table 2> SW2 (CAPACITY CODE)
SW2
MODELS
Service
MODELS
1 2 3 4 5
PLA-A12BA
1 2 3 4 5
PLA-A18BA
1 2 3 4 5
PLA-A24BA
SYMBOL
MF
MV
TB4
TB5,TB6
NAME
FAN MOTOR
VANE MOTOR
TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE)
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)
ROOM TEMP. THERMISTOR
(0°C / 15k, 25°C / 5. 4k DETECT)
PIPE TEMP. THERMISTOR/LIQUID
(0°C / 15k, 25°C / 5. 4k DETECT)
COND. / EVA. TEMP. THERMISTOR
(0°C / 15k, 25°C / 5. 4k DETECT)
TH1
TH2
TH5
OPTION PART
W.B
BZ
LED1
LED2
RU
SW1
SW2
PCB FOR WIRELESS REMOTE CONTROLLER
BUZZER
LED (OPERATION INDICATION : GREEN)
LED (PREPARATION FOR HEATING : ORANGE)
RECEIVING UNIT
EMERGENCY OPERATION (HEAT / DOWN)
EMERGENCY OPERATION (COOL / UP)
Service
1 2 3 4 5
ON PLA-A30BA
OFF
1 2 3 4 5
ON PLA-A36BA
OFF
1 2 3 4 5
ON PLA-A42BA
OFF
<Table 1> SW1 (MODEL SELECTION)
SW1
Service
Refer to tables 1 and 2.
ON
OFF
TB5
2
1
TRANSMISSION
WIRES
DC12V
ON
OFF
2 1
TB6
ON
OFF
1 2 3 4 5
ON
OFF
R.B
I.B
VANE CNV(WHT)
20 18 16 14 12 10 8 6 4 2
SW1
J41 J42
SW2
19 17 15 13 11 9 7 5 3 1
CN32
(WHT) 1
CN51(WHT)
Pair No.
5
LED3
LED2
LED1
2 1
1
4
(BLU)
1 3
DSA
INDOOR/OUTDOOR
COMMUNICATION
CN3C
CN41(WHT)
CN2L
OUTDOOR 1 3 5
CN01
3
(BLU)
12
REMOCON
CN22
1
SWE
FUSE
ZNR02 U
U
DC280V
ZNR01
RECTIFICATION
(BLU)
TB4
ON OFF
1
WIRELESS
CN90
(WHT)
3
CN3G
(BLK)
1
9
I-SEE
SENSOR
CN4Y
1 (WHT) 4
I-SEE
SENSOR MOTOR
CN6Y
1 (RED) 6
CNAC
(WHT)
3 1
FLOAT SW LIQUID/PIPE INTAKE
CN4F
CN44
CN20
(WHT)
(WHT)
(RED)
1
4
1
4
1 2
X1
FAN
CNMF
(WHT)
7
4
1
3
1 D.U.M
CNP
YLW
ORN
YLW
ORN
S1
S2
S3
+1
TO OUTDOOR
UNIT
ORN
BRN
(BLU)
4
9
5
5
5
5
M
M
M
M
CNB
BZ
5
M
I-SEE
SENSOR
t˚
FS
LED1
SW2
MV MV MV MV
GRILLE
TH2 TH5
t˚
MS
3~
TH1
MF
M
1~
DP
+ Be sure to turn off the power source
and then disconnect fan motor connector.
(Failure to do so will cause trouble in fan motor.)
MT
LED2
SW1
t˚
I-SEE SENSOR
CORNER PANEL
(OPTION PART)
RU
W.B
Notes: 1. SymboIs used in wiring diagram above are,
:Connector,
:Terminal block.
2. Indoor and outdoor connecting wires have poIarities, make sure to match terminal numbers (S1, S2, S3) for correct wirings .
3. Since the outdoor side electric wiring may change, be sure to check the outdoor unit electric wiring for servicing .
+1.Use copper supply wires.
[Self-diagnosis]
1.For details on how to operate self-diagnosis with the wireless remote control,refer to the technical manuals etc.
2.For the wired remote control:When you quickly press twice the CHECK switch on the remote control, the unit begins
self-diagnosis, and Check Codes generated in the past appear on the display.
13
INDOOR UNIT
PLA-A12BA1 PLA-A18BA1
[LEGEND]
SYMBOL
I.B
CN2L
CN24
CN30
CN32
CN41
CN51
DSA
FUSE
LED1
LED2
LED3
SW1
SW2
SWE
X1
=15
DP
FS
NAME
INDOOR CONTROLLER BOARD
CONNECTOR (LOSSNAY)
CONNECTOR<BACK-UP HEATING>
CONNECTOR<LLC>
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
SURGE ABSORBER
FUSE (T6.3AL250V)
POWER SUPPLY (I.B)
POWER SUPPLY (R.B)
TRANSMISSION (INDOOR-OUTDOOR)
SWITCH (MODEL SELECTION) +See table 1.
SWITCH (CAPACITY CODE) +See table 2.
CONNECTOR (EMERGENCY OPERATION)
RELAY (DRAIN PUMP)
VARISTOR
DRAIN-UP MACHINE
DRAIN FLOAT SWITCH
<Table 2>SW2(CAPACITY CODE)
SW2
MODELS
Service
MODELS
1 2 3 4 5
PLA-A12BA
1 2 3 4 5
PLA-A18BA
1 2 3 4 5
PLA-A24BA
PLA-A24BA1
PLA-A30BA1
SYMBOL
MF
MV
TB4
7%7%
PLA-A36BA1
PLA-A42BA1
NAME
FAN MOTOR
VANE MOTOR
TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE)
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)
ROOM TEMP. THERMISTOR
Û&NȍÛ&Nȍ'(7(&7
PIPE TEMP. THERMISTOR/LIQUID
Û&NȍÛ&Nȍ'(7(&7
COND. / EVA. TEMP. THERMISTOR
Û&NȍÛ&Nȍ'(7(&7
TH1
TH2
TH5
OPTION PART
W.B
BZ
LED1
LED2
RU
SW1
SW2
PCB FOR WIRELESS REMOTE CONTROLLER
BUZZER
LED (OPERATION INDICATION : GREEN)
LED (PREPARATION FOR HEATING : ORANGE)
RECEIVING UNIT
EMERGENCY OPERATION (HEAT / DOWN)
EMERGENCY OPERATION (COOL / UP)
Service
ON PLA-A30BA
OFF
ON PLA-A36BA
OFF
ON PLA-A42BA
OFF
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
ON
OFF
<Table 1>SW1(MODEL SELECTION)
SW1
Service
Refer to tables 1 and 2.
TB5
2
1
TRANSMISSION
WIRES
DC12V
ON
OFF
2 1
TB6
ON
OFF
1 2 3 4 5
ON
OFF
R.B
I.B
VANE CNV(WHT)
20 18 16 14 12 10 8 6 4 2
SW1
J41 J42
SW2
19 17 15 13 11 9 7 5 3 1
Pair No.
5
LED2
LED1
1
2 1
4
DSA
INDOOR/OUTDOOR
COMMUNICATION
CN3C
(BLU)
12
REMOCON
CN22
1
SWE
(BLK)
1 3
2 1
CN41(WHT)
CN2L
LED3
OUTDOOR 1 3 5
CN01
CN32
(WHT) 1
3
CN51(WHT) CN24(YLW)
FUSE
ZNR02 U
DC280V
U
ZNR01
RECTIFICATION
(BLU)
ON OFF
1
WIRELESS
CN90
(WHT)
3
CN3G
(BLK)
1
9
I-SEE
SENSOR
CN4Y
(WHT)
1
4
I-SEE
SENSOR MOTOR
CN6Y
(RED)
1
6
CNAC
(WHT)
3 1
FLOAT SW LIQUID/PIPE INTAKE
CN4F
CN44
CN20 CN30
(WHT)
(WHT)
(RED) (GRN)
1
4
1
4
1 2
1
3
X1
FAN
CNMF
(WHT)
7
4
1
3
1 D.U.M
CNP
YLW
ORN
TB4
YLW S1
ORN S2
S3
+1
TO
OUTDOOR
UNIT
ORN
BRN
(BLU)
4
9
5
5
5
5
M
M
M
M
MV
MV
MV
MV
CNB
BZ
I-SEE
SENSOR
5
M
MT
LED2
SW1
LED1
SW2
GRILLE
I-SEE SENSOR
CORNER PANEL
(OPTIONAL PART)
FS
tÛ
tÛ
TH2 TH5
tÛ
TH1
MS
3~
MF
M
1~
DP
+%HVXUHWRWXUQRIIWKHSRZHUVRXUFH
and then disconnect fan motor connector.
)DLOXUHWRGRVRZLOOFDXVHWURXEOHLQIDQPRWRU
RU
W.B
Notes: 6\PER,VXVHGLQZLULQJGLDJUDPDERYHDUH&RQQHFWRU7HUPLQDOEORFN
,QGRRUDQGRXWGRRUFRQQHFWLQJZLUHVKDYHSR,DULWLHVPDNHVXUHWRPDWFKWHUPLQDOQXPEHUV666IRUFRUUHFWZLULQJ
6LQFHWKHRXWGRRUVLGHHOHFWULFZLULQJPD\FKDQJHEHVXUHWRFKHFNWKHRXWGRRUXQLWHOHFWULFZLULQJIRUVHUYLFLQJ
+8VHFRSSHUVXSSO\ZLUHV
[Self-diagnosis]
)RUGHWDLOVRQKRZWRRSHUDWHVHOIGLDJQRVLVZLWKWKHZLUHOHVVUHPRWHFRQWUROUHIHUWRWKHWHFKQLFDOPDQXDOVHWF
)RUWKHZLUHGUHPRWHFRQWURO:KHQ\RXTXLFNO\SUHVVWZLFHWKH&+(&.VZLWFKRQWKHUHPRWHFRQWUROWKHXQLWEHJLQVVHOIGLDJQRVLV
DQG&KHFN&RGHVJHQHUDWHGLQWKHSDVWDSSHDURQWKHGLVSOD\
14
9
REFRIGERANT SYSTEM DIAGRAM
PLA-A12BA PLA-A18BA
PLA-A12BA1 PLA-A18BA1
PLA-A24BA
PLA-A24BA1
PLA-A30BA
PLA-A30BA1
PLA-A36BA
PLA-A36BA1
PLA-A42BA
PLA-A42BA1
Strainer (#50)
Heat exchanger
Refrigerant GAS pipe connection
(Flare)
Thermistor TH5
(Cond./ Eva. temperature)
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant LIQUID pipe connection
(Flare)
Thermistor TH1
(Room temperature)
Thermistor TH2
Pipe temperature (Liquid)
Distributor
with strainer (#50)
Strainer (#50)
15
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 or controller board of outdoor unit.
Actions to be taken for service and the trouble reoccurrence at field 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 “SELF-DIAGNOSIS ACTION TABLE” (10-3).
The trouble is reoccurring.
Not displayed
Logged
The trouble is not reoccurring.
Not logged
Identify the cause of the trouble and take a corrective
action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA” (10-4).
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, and wiring related.
Reset error code logs and restart the unit after finishing
service.
There is no abnormality in electrical components,
controller boards, and remote controller.
Recheck the abnormal symptom.
Identify the cause of the trouble and take
a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA” (10-4).
Continue to operate unit for the time being if the cause
is not ascertained.
There is no abnormality in electrical components,
controller boards, remote controller etc.
16
10-2. MALFUNCTION-DIAGNOSIS METHOD BY 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]
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.)
Refrigerant
address
display
CHECK
CHECK
display
Temperature
button
TEMP
ON/OFF
ON/OFF
button
MODE
FAN
AUTO STOP
VANE
AUTO START
CHECK LOUVER
CHECK
button
min
TEST RUN
SET
h
RESET
CLOCK
HOUR
button
3. Point the remote controller at the • If an air conditioner error occurs, the
sensor on the indoor unit and
indoor unit's sensor emits an intermitpress the HOUR button.
tent 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 • The check mode is cancelled.
sensor on the indoor unit and
press the ON/OFF button.
To be continued to the next page.
17
• 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
Beep
Beep
nth
1st
3 rd
On
On
On
0.5 sec. 0.5 sec. 0.5 sec.
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
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
Remark
Intake sensor error
Pipe (TH2) sensor error
Pipe (TH5) sensor error
Indoor/outdoor unit communication 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
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wireless remote controller Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
Check code
(Number of times)
1
E9
2
3
4
UP
U3,U4
UF
5
U2
6
U1,Ud
7
8
9
10
U5
U8
U6
U7
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/49C worked/
insufficient refrigerant
Abnormal high pressure (63H worked)/Overheating
protection operation
Abnormal temperature of heatsink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of superheat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
–
–
Other errors (Refer to the technical manual for the outdoor unit.)
Remark
For details, check
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.
–
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.
18
• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• On wired remote controller
Check code displayed in the LCD. (Refer to the previous page, check code.)
• If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.
Symptom
Cause
Wired remote controller
LED 1, 2 (PCB in outdoor unit)
For about 2
After LED 1, 2 are lighted, LED 2 is •For about 2 minutes following power-on,opPLEASE WAIT
minutes after turned off, then only LED 1 is
eration of the remote controller is not possible
lighted. (Correct operation)
power-on
due to system start-up. (Correct operation)
•Connector for the outdoor unit’s protection
Only LED 1 is lighted. m
device is not connected.
PLEASE WAIT m Error code
LED 1, 2 blink. •Reverse or open phase wiring for the outdoor
Subsequent to
unit’s power terminal block (L1, L2, GR)
about 2 minutes
after power-on Only LED 1 is lighted. m
Display messages do not
•Incorrect wiring between indoor and outdoor
appear even when operation
LED 1 blinks twice, units (incorrect polarity of S1, S2, S3)
switch is turned ON (operation
LED 2 blinks once. •Remote controller wire short
lamp does not light up).
On the wireless remote controller with condition above, following phenomena take place.
• No signals from the remote controller can be received.
• OPE lamp is blinking.
• The buzzer makes a short ping sound.
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
LED1 (power for microcomputer)
LED2 (power for remote controller)
Indicates whether control power is supplied. Make sure that this LED is
always lit.
Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant addresses “0”.
LED3 (communication between indoor and
outdoor units)
Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.
19
10-3. SELF-DIAGNOSIS ACTION TABLE
Error Code
P1
Abnormal point and detection method
Room temperature thermistor (TH1)
The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 minutes. (The unit returns to normal operation, if it has been reset normally.)
Constantly detected during cooling,
drying, and heating operation.
Short: 90>Û)@RUPRUH
Open: -40>Û)@RUOHVV
Note: Refer to the manual of outdoor unit for the details of display
such as F, U, and other E.
Cause
Defective thermistor
characteristics
Contact failure of connector
(CN20) on the indoor controller
board (Insert failure)
Breaking of wire or contact
failure of thermistor wiring
Defective indoor controller
board
Countermeasure
– Check resistance value of thermistor.
0>Û)@ • • • • • • • • • • 15.0k
10>Û)@ • • • • • • • • • • • • 9.6k
20>Û)@ • • • • • • • • • • • • 6.3k
30>Û)@ • • • • • • • • • • • • 4.3k
40>Û)@ • • • • • • • • • • •3.0k
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor, breaking of wire or contact failure can be
detected.
Check contact failure of connector (CN20) on
the indoor controller board. Refer to 10-7.
Turn the power on again and check restart
after inserting connector again.
Check room temperature display on remote
controller.
Replace indoor controller board if there is
abnormal difference with actual room
temperature.
Turn the power off, and on again to operate
after check.
P2
Pipe temperature thermistor/Liquid
(TH2)
The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 minutes. (The unit returns to normal operation, if it has been reset normally.)
Constantly detected during cooling,
drying, and heating (except defrosting)
operation.
Short: 90>Û)@RUPRUH
Open: -40>Û)@RUOHVV
Defective thermistor
characteristics
Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
Breaking of wire or contact
failure of thermistor wiring
Defective refrigerant circuit is
causing thermistor temperature of 90>Û)@RUPRUHRU
-40>Û)@RUOHVV
Defective indoor controller
board
– Check resistance value of thermistor.
For characteristics, refer to (P1) above.
Check contact failure of connector (CN44) on
the indoor controller board. Refer to 10-7.
Turn the power on and check restart after
inserting connector again.
Check pipe <liquid> temperature with remote
controller in test run mode. If pipe <liquid>
temperature is extremely low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defect.
Check pipe <liquid> temperature with remote
controller in test run mode. If there is extremely
difference with actual pipe <liquid> temperature,
replace indoor controller board.
Turn the power off, and on again to operate
after check.
P4
(5701)
P5
Contact failure of drain float switch (CN4F) Contact failure of connector
Extract when the connector of drain float
(Insert failure)
switch is disconnected.
( and of connector CN4F is not
short-circuited.)
Defective indoor controller
Constantly detected during operation.
board
Check contact failure of float switch connector.
Turn the power on again and check after
inserting connector again.
Operate with connector (CN4F) short-circuited.
Replace indoor controller board if abnormality
reappears.
Drain overflow protection operation
Suspensive abnormality, if drain float
switch is detected to be underwater for
1 minute and 30 seconds continuously
with drain pump on.
Turn off compressor and indoor fan.
Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.
Constantly detected during drain pump
operation.
Check if drain-up machine works.
Check drain function.
Malfunction of drain pump
Defective drain
Clogged drain pump
Clogged drain pipe
Defective drain float switch
Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)
Defective indoor-controller
board
Remove drain float switch connector CN4F
and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN with
the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.
Replace indoor controller board if it is shortcircuited between - of the drain float
switch connector CN4F and abnormality
reappears.
It is not abnormal if there is no problem about
the above-mentioned ~
Turn the power off, and on again to operate
after check.
20
Error Code
P6
P8
Abnormal point and detection method
Freezing/overheating protection is working
Freezing protection (Cooling mode)
The unit is in 6-minute resume prevention
mode if pipe <liquid or condenser/evaporator> temperature stays under
Û&>Û)@IRUPLQXWHVPLQXWHVDIWHU
the compressor started. Abnormal if it
VWD\VXQGHUÛ&>Û)@IRUPLQXWHV
again within 16 minutes after 6-minute
resume prevention mode.
Overheating protection (Heating mode)
The units is in 6-minute resume
prevention mode if pipe <condenser /
evaporator> temperature is detected as
RYHUÛ&>Û)@ after the compressor
started. Abnormal if the temperature
RIRYHUÛ&>Û)@ is detected again
within 10 minutes after 6 minute resume
prevention mode.
Cause
(Cooling or drying mode)
Clogged filter (reduced airflow)
Short cycle of air path
Low load (low temperature)
operation out of the tolerance
range
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defective.
Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit
(clogs)
(Heating mode)
Clogged filter (reduced airflow)
Short cycle of air path
Overload (high temperature)
operation out of the tolerance
range
Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defective.
Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit
(clogs)
Bypass circuit of outdoor unit
is defective.
Pipe temperature
Slight temperature difference
<Cooling mode>
between indoor room
Detected as abnormal when the pipe temtemperature and pipe <liquid
perature is not in the cooling range 3 minor condenser / evaporator>
utes after compressor start and 6 minutes
temperature thermistor
after the liquid or condenser/evaporator pipe
• Shortage of refrigerant
is out of cooling range.
• Disconnected holder of pipe
Note 1) It takes at least 9 minutes to detect.
<liquid or condenser /
Note 2) Abnormality P8 is not detected in
evaporator> thermistor
drying mode.
• Defective refrigerant circuit
Cooling range : -GHJ&>GHJ)@ (TH-TH1) Converse connection of
TH: Lower temperature between liquid pipe
extension pipe (on plural units
temperature (TH2) and condenser/
connection)
evaporator temperature (TH5)
Converse wiring of indoor/
TH1: Intake temperature
outdoor unit connecting wire
(on plural units connection)
<Heating mode>
Defective detection of indoor
When 10 seconds have passed after the
room temperature and pipe
compressor starts operation and the hot
<condenser / evaporator>
adjustment mode has finished, the unit is
temperature thermistor
detected as abnormal when condenser/
Stop valve is not opened
evaporator pipe temperature is not in heatcompletely.
ing range within 20 minutes.
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 : GHJ&>GHJ)@(TH5-TH1)
21
Countermeasure
(Cooling or drying mode)
Check clogs of the filter.
Remove shields.
Refer to 10-6.
Check outdoor fan motor.
Check operating condition of refrigerant
circuit.
(Heating mode)
Check clogs of the filter.
Remove shields.
Refer to 10-6.
Check outdoor fan motor.
~Check operating condition of refrigerant
circuit.
~ 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)’.
)
Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
Error Code
P9
Abnormal point and detection method
Pipe temperature thermistor /
Condenser-Evaporator (TH5)
The unit is in 3-minute resume protection mode if short/open of thermistor is
detected. Abnormal if the unit does not
get back to normal within 3 minutes. (The
unit returns to normal operation, if it has
been reset normally.)
Constantly detected during cooling,
drying, and heating operation (except
defrosting)
6KRUWÛ&>Û)@RUPRUH
2SHQÛ&>Û)@RUOHVV
Cause
Defective thermistor
characteristics
Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
Breaking of wire or contact
failure of thermistor wiring
Temperature of thermistor is
Û&>Û)@RUPRUHRU
Û&>Û)@RUOHVVFDXVHGE\
defective refrigerant circuit.
Defective indoor controller
board
Countermeasure
–
Check resistance value of thermistor.
For characteristics, refer to (P1) above.
Check contact failure of connector (CN44) on
the indoor controller board. Refer to 10-7.
Turn the power on and check restart after
inserting connector again.
Operate in test run mode and check pipe <condenser / evaporator> temperature with outdoor
controller circuit board. If pipe
<condenser / evaporator> temperature is exclusively low (in cooling mode) or high (in heating
mode), refrigerant circuit may have defect.
Operate in test run mode and check pipe <condenser / evaporator> temperature with outdoor
control circuit board. If there is
extreme difference with actual pipe
<condenser / evaporator> temperature, replace
indoor controller board.
There is no abnormality if none of above comes
within the unit.
Turn the power off and on again to operate.
(
PA
(2500)
Forced compressor stop
(due to water leakage abnormality)
The unit has a water leakage abnormality when the following conditions, a)
and b), are satisfied while the abovementioned detection is performed.
a) The intake temperature subtracted
with liquid pipe temperature detects to
be less than -10Û&[14Û)@IRUDWRWDORI
30 minutes. (When the drain sensor
is detected to be NOT soaked in the
water, the detection record of a) and b)
will be cleared.)
b) Drain float switch detects to be in the
water for more than 15 minutes.
*Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
Remote controller transmission
error(E0)/signal receiving error(E4)
Abnormal if main or sub remote controller cannot receive any transmission
normally from indoor unit of refrigerant
address “0” for 3 minutes.
(Error code : E0)
Abnormal if sub remote controller could
not receive for any signal for 2 minutes.
(Error code: E0)
E0
or
E4
Abnormal if indoor controller board
cannot receive any data normally from
remote controller board or from other
indoor controller board for 3 minutes.
(Error code: E4)
Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Error code: E4)
In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service
tool (PAC-SK52ST).
)
Drain pump trouble
Drain defective
· Drain pump clogging
· Drain pipe clogging
Open circuit of float switch
Contact failure of float switch
connector
Dew condensation on float switch
·Drain water descends along
lead wire.
·Drain water waving due to filter
clogging.
Extension piping connection
difference at twin, triple, quadruple system.
Miswiring of indoor/ outdoor
connecting at twin, triple, quadruple system.
Room temperature thermistor /
liquid pipe temperature thermistor detection is defective.
Check the drain pump.
Check whether water can be drained.
Contact failure at transmission
wire of remote controller
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.
Miswiring of remote controller
Defective transmitting receiving
circuit of remote controller
Defective transmitting receiving
circuit of indoor controller board
of refrigerant addresses “0”.
Noise has entered into the
transmission wire of remote
controller.
Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
Set one of the remote controllers “main”
if there is no problem with the action above.
Check wiring of remote controller.
‡7RWDOZLULQJOHQJWKPD[P>IW@
(Do not use cable % 3 or more.)
• The number of connecting indoor units:
max. 16 units
• The number of connecting remote controller: max. 2 units
22
Check the resistance of the float switch.
Check the connector contact failure.
Check the float switch leadwire mounted.
Check the filter clogging.
Check the piping connection.
Check the indoor/ outdoor connecting wires.
Check the room temperature display of
remote controller.
Check the indoor liquid pipe temperature display of outdoor controller board.
When the above-mentioned problem of ~
are not applied,
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” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)¡1RLVHPD\EHFDXVLQJDEQRUPDOLW\@
H If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.
Error Code
E3
or
E5
E6
E7
Fb
Abnormal point and detection method
Cause
Remote controller transmission
error(E3)/signal receiving error(E5)
Abnormal if remote controller could not
find blank of transmission path for 6 seconds and could not transmit.
(Error code: E3)
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)
2 remote controllers are set as
“main.”
(In case of 2 remote controllers)
Remote controller is connected Remote controller is connected with only one
indoor unit.
with 2 indoor units or more.
The address changes to a separate setting.
Repetition of refrigerant
address
~Diagnose remote controller.
Defective transmitting receiving
a) When “RC OK” is displayed, remote concircuit of remote controller
trollers have no problem.
Defective transmitting receiving
Turn the power off, and on again to check.
Abnormal if indoor controller board could
circuit of indoor controller board
When becoming abnormal again, replace
not find blank of transmission path.
Noise has entered into transindoor controller board.
(Error code: E5)
mission wire of remote controlb)When “RC NG” is displayed, replace
Indoor controller board receives transler.
remote controller.
mitted data at the same time, compares
c)When “RC E3” or “ERC 00-66” is disthe data,and when detecting it, judges
played, noise may be causing abnormaldifferent data to be abnormal 30
ity.
continuous times. (Error code: E5)
Indoor/outdoor unit communication
error (Signal receiving error)
Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
Abnormal if indoor controller board
cannot receive any signal normally for 3
minutes.
Consider the unit as abnormal under
the following condition: When 2 or more
indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for 3 minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.
Contact failure, short circuit or, H Check LED display on the outdoor control
circuit board. (Connect A-control service
miswiring (converse wiring) of
tool, PAC-SK52ST.)
indoor/outdoor unit connecting
Refer to EA-EC item if LED displays EA-EC.
wire
Check disconnection or looseness of indoor/
Defective transmitting receiving
outdoor unit connecting wire of indoor unit or
circuit of indoor controller board
outdoor unit.
Defective transmitting receiving
Check all the units in case of twin indoor
circuit of indoor controller board
unit system.
Noise has entered into indoor/ - Turn the power off, and on again to check.
If abnormality generates again, replace
outdoor unit connecting wire.
indoor controller board or outdoor
controller circuit board.
H Other indoor controller board may have
defect in case of twin indoor unit system.
Indoor/outdoor unit communication
Defective transmitting receiving - Turn the power off, and on again to check.
error (Transmitting error)
If abnormality generates again, replace
circuit of indoor controller board
Abnormal if indoor controller board
indoor controller board.
Noise has entered into power
receives “1” 30 times continuously when
supply.
indoor controller board transmits “0” signal. Noise has entered into outdoor
control wire.
Indoor controller board
Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.
Defective indoor controller
board
Remote controller control board
Defective remote controller
Abnormal if data cannot be read normally from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
E1
or
E2
Countermeasure
Set a remote controller to main, and the
other to sub.
Abnormal if the clock function of remote
controller cannot be operated normally.
(Error code: E2)
23
Replace indoor controller board.
Replace remote controller.
10-4. TROUBLESHOOTING BY INFERIOR PHENOMENA
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
Phenomena
(1)LED2 on indoor controller board
is off.
Cause
• When LED1 on indoor controller board is also off.
Power supply of rated voltage is not supplied to outdoor unit.
Defective outdoor controller circuit board
Power supply of 208/230V is not supplied to indoor
unit.
Defective indoor controller board
(For the separate indoor/outdoor unit power supply system)
Power supply of 208/230V AC is not supplied to
indoor unit.
The connectors of the optional replacement kit are
not used.
Defective indoor controller board
• When LED1 on indoor controller board is lit.
Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant
address “0”.)
24
Countermeasure
Check the voltage of outdoor power
supply terminal block (L1, L2).
• When AC 208/230V is not detected,
check the power wiring to outdoor unit
and the breaker.
• When AC 208/230V is detected, check
(below).
Check the voltage between outdoor
terminal block S1 and S2.
• When AC 208/230V is not detected,
—check the fuse on outdoor controller
circuit board.
—check the wiring connection.
• When AC 208/230V is detected, check
(below).
Check the voltage between indoor terminal
block S1 and S2.
• When AC 208/230V is not detected,
check indoor/outdoor unit connecting
wire for miswiring.
• When AC 208/230V is detected, check
(below).
Check the fuse on indoor controller board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.
Check the voltage of indoor power supply
terminal block (L1,L2).
• When AC208/230V is not detected,
check the power supply wiring.
• When AC208/230V is detected, check
(below).
Check that there is no problem in the
method of connecting the connectors.
• When there are problems in the method
of connecting the connectors, connect
the connector correctly referring to
installation manual of an optional kit.
• When there is no problem in the method of connecting the connectors, check
(below).
Check the fuse on indoor controller board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.
Check again the setting of refrigerant
address for outdoor unit.
Set the refrigerant address to “0”.
(For grouping control system under
which 2 or more outdoor units are
connected, set one of the units to “0”.)
Set refrigerant address using SW1 (3-6)
on outdoor controller circuit board.
Note: Refer to the manual of outdoor unit for the detail of remote
controller.
Phenomena
Cause
Countermeasure
(2)LED2 on indoor controller board
is blinking.
• When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting wire
Connection failure of indoor/outdoor unit connecting for connection failure.
wire
• When LED1 is lit.
Check the connection of remote controller wires in case of twin indoor unit
Miswiring of remote controller wires
Under twin indoor unit system, 2 indoor units are
system. When 2 indoor units are wired in
wired together.
one refrigerant system,
connect remote controller wires to one of
those units.
Refrigerant address for outdoor unit is wrong or not Check the setting of refrigerant address
set.
in case of grouping control system.
Under grouping control system, there are some units
If there are some units whose refrigerant
addresses are 0 in one group, set one of
whose refrigerant address is 0.
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.
Remove remote controller wires and
Short-cut of remote controller wires
check LED2 on indoor controller board.
Defective remote controller
• When LED2 is blinking, check the shortcut of remote controller wires.
• When LED2 is lit, connect remote
controller wires again and:
if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.
(3)Upward/downward vane
performance failure
The vane is not downward during defrosting and heat Normal operation (The vane is set to
horizontal regardless of remote control.)
preparation and when the thermostat is OFF in HEAT
mode. (Working of COOL protection function)
Check (left).
Vane motor does not rotate.
• Check the vane motor. (Refer to “How
• Defective vane motor
to check the parts”.)
• Breaking of wire or connection failure of connector
• Check for breaking of wire or connection failure of connector.
Normal operation (Each connector on
Upward/downward vane does not work.
vane motor side is disconnected or set• The vane is set to fixed position.
ting the fixed vanes by wired remote
controller.)
(4)Receiver for wireless remote
controller
Weak batteries of wireless remote controller
Replace batteries of wireless remote controller.
~
Contact failure of connector (CNB) on wireless
remote controller board
Check contact failure of each connector.
If no problems are found of connector,
(Insert failure)
replace indoor controller board.
Contact failure of connector (CN90) on indoor controller board (Insert failure)
When the same trouble occurs even if
indoor controller board is replaced,
Contact failure of connector between wireless remote
replace wireless remote controller
controller board and indoor controller board
board.
25
10-5. EMERGENCY OPERATION
10-5-1. When wireless remote controller troubles or its battery is exhausted
When the remote controller cannot be used
When the batteries of the remote controller run out or the remote controller malfunctions, the emergency operation can be done using the emergency buttons on the grille.
DEFROST/STAND BY lamp
Operation lamp
Emergency operation switch (heating)
Emergency operation switch (cooling)
Receiver
Starting operation
for more than 2
• To operate the cooling mode, press the
button
seconds.
for more than 2
button
• To operate the heating mode, press the
seconds.
* Lighting of the Operation lamp means the start of operation.
Note:
• Details of emergency mode are as shown below.
Operation mode
Set temperature
Fan speed
Airflow direction
Stopping operation
• To stop operation, press the
COOL
24,75˚F
High
Horizontal
button
HEAT
24,75˚F
High
Downward 5
or the
button
.
10-5-2. When wired remote controller or indoor unit microcomputer troubles
1.When the wired remote control or the indoor unit microcomputer has failed, but all other components work properly,
if you set the switch (SWE) on the indoor controller board ON, the indoor unit will begin emergency operation.
When emergency operation is activated, the indoor unit operates as follows:
(1)Indoor fan is running at high speed. (2)Drain-up machine is working.
+ Note on the wireless remote control: when the remote control does not function, it is possible to activate
emergency operation by using the indoor unit emergency operation switch (SW1, SW2 of the wireless signal
receiver board).
However, if the indoor unit microcomputer has failed, it is necessary to proceed with points 2 and 3 below as in the
case of the wired remote control.
2.When you activate emergency operation of the cooling or heating, you have to set the switch (SWE) on the indoor
controller board and activate emergency operation of the outdoor unit.
For details on how to activate emergency operation of the outdoor unit, refer to the outdoor unit wiring diagram.
3.Before you activate emergency operation, check the following points:
(1)Emergency operation cannot be activated when:
•the outdoor unit malfunctions. •the indoor fan malfunctions.
•when it has detected the malfunction of drain-up machine during self-diagnosing.
(2)Emergency operation becomes continuous only by switching the power source on/off.
ON/OFF on the remote control or temperature control etc. does not function.
(3)Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation
of the heating is activated because it will start to blow cold air.
(4)Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5)After emergency operation has been deactivated set the switches etc. to their original positions.
(6)Movement of the vanes does not work in emergency operation, therefore you have to slowly set them
manually to the appropriate position.
26
10-6. HOW TO CHECK THE PARTS
PLA-A12BA PLA-A18BA PLA-A24BA
PLA-A12BA1 PLA-A18BA1 PLA-A24BA1
PLA-A30BA
PLA-A30BA1
Parts name
Room temperature
thermistor
(TH1)
Pipe temperature
thermistor/liquid(TH2)
Condenser/Evaporator
temperature thermistor
(TH5)
Vane motor (MV)
PLA-A36BA
PLA-A36BA1
PLA-A42BA
PLA-A42BA1
Check points
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature of 10˚C[50˚F]~30˚C[86˚F])
Normal
Abnormal
4.3k~9.6k
Open or short
(Refer to the Thermistor Characteristic graph.)
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20˚C[68˚F]~30˚C[86˚F])
White
Connector
Orange
Red
Blue
Yellow
Red - Yellow
(-, -, -, -)
Red - Blue
(-
, -, -, -)
Red - Orange (-, -, -, -)
Red - White
Drain pump (DP)
Normal
Abnormal
300
Open or short
(-, -, -
, -)
Measure the resistance between the terminals with a tester.
(Winding temperature 20˚C[68˚F])
YLW
1
Normal
Abnormal
3
290
Open or short
YLW
Drain float switch (FS)
Measure the resistance between the terminals with a tester.
Moving part
State of moving part
Normal
Abnormal
2
UP
Short
Other than short
3
DOWN
Open
Other than open
1
Switch
Magnet
4
Moving part
i-see sensor
(Option)
Turn on the indoor unit with the black plastic tape on the outside of
i-see sensor controller board.
With electricity being turned on, measure the power voltage between connectors with tester.
i-see sensor rotates and pull out the connector of motor for i-see sensor.
Do not disassemble corner panel
with i-see sensor.
Black plastic tape
4 3 2 1
i-see sensor (At the ambient temperature of 10˚C[50˚F]~40˚C[104˚F])
i-see sensor connector
4 3 2 1
Blue BlackPink Brown
(–)—(+)
Normal
DC 1.857V~ 3.132V
Abnormal
Other than the normal
(+)—(–)
DC 0.939V~ 1.506V
Other than the normal
NOTE : Be careful of handing such a static electricity.
Vane motor for
i-see sensor (Option)
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20˚C[68˚F]~30˚C[86˚F])
Connector
White
Normal
Abnormal
250
Open or short
Red - Yellow
Red - Blue
Orange
Red - Orange
Red
Blue
Yellow
Red - White
27
10-6-1. Thermistor
<Thermistor Characteristic graph>
Thermistor for
lower temperature
<Thermistor for lower temperature>
50
Room temperature thermistor(TH1)
Pipe temperature thermistor/liquid(TH2)
Condenser/evaporator temperature
thermistor(TH5)
t()Rt=15exp { 3480(
1
273+t
Resistance (k)
Thermistor R0=15k± 3%
Fixed number of B=3480± 2%
1
)}
273
1
7Û)5W H[S^
273+ T-32
1.8
40
1
`
273
20
10
N
N
N
N
N
N
0Û)
10Û)
20Û)
25Û)
30Û)
40Û)
30
0
-20 -10 0 10 20 30 40 50 -4 -14 32 50 68 86 104122 F
Temperature
10-6-2. DC Fan motor (FAN MOTOR/ INDOOR CONTROLLER BOARD)
Check method of DC fan motor (fan motor / indoor controller circuit board)
Notes
· High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit board and fan motor.)
Self check
Symptom : The indoor fan cannot turn around.
Check the fuse (FUSE) on indoor
controller board.
Did the fuse blow?
Check the drain pump (DP).
Is the resistance between
terminals normal?
Yes
No
Wiring contact check
Contact of fan motor connector (CNMF)
Replace indoor controller board (I.B).
Replace fan motor (MF).
Yes
No
Replace drain pump (DP).
Is there no contact failure?
Wiring recovery
No
Yes
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit board.
TEST POINT :
VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC294~325V
TEST POINT :
VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V
Is the voltage normal?
Replace the fan motor.
Yes
Yes
No
Check the operation of fan.
Replace indoor
controller board.
NG
Replace indoor controller board.
OK
Check the operation.
END
NG
Replace the fan motor.
28
OK
END
10-7.TEST POINT DIAGRAM
Indoor controller board
PLA-A12BA PLA-A18BA
PLA-A12BA1 PLA-A18BA1
CN90
Connect to the wireless
remote controller board
(CNB)
PLA-A24BA
PLA-A24BA1
LED3
Transmission
(Indoor/outdoor)
PLA-A30BA
PLA-A30BA1
PLA-A36BA
PLA-A36BA1
PLA-A42BA
PLA-A42BA1
CNV
Vane motor output (MV)
12V pulse output
CN4Y
i-see sensor
SW1
Model selection
CN6Y
i-see sensor motor output
12V DC pulse output
SW2
Capacity setting
LED2
Power supply (R.B)
CN4F
Drain float switch (FS)
Jumper wire J41,J42
Pair No. setting for wireless
remote controller
CN44
Pipe temperature
thermistor
- : Liquid (TH2)
- : Condenser/Evaporator(TH5)
CN2L
Connector (LOSSNAY)
SWE
Emergency operation
CN20
Room temperature thermistor
(TH1)
CN41
Connector
(HA terminal-A)
LED1
Power supply (I.B)
CN24
(Only PLA-A.BA1)
Connector (Back-up heating)
CN30(Only PLA-A.BA1)
Connector (LLC)
CN22
Connect to the terminal block (TB5)
(Remote controller connecting wire)
(10.4~14.6V DC)
VFG : Voltage between
PC6722 and C955(-)
(Same as (+)–(-) of CNMF)
CN3C
Transmission
(Indoor/outdoor)
(0~24V DC)
VSP : Voltage between pins of
C626
DC0V (FAN stop)
DC1~6.5V (FAN operation)
(Same as (+)–(-) of CNMF)
VCC : Voltage between pins of C955
15VDC
(Same as (+)–(-) of CNMF)
CNMF
Fan motor
-: DC 294~325V
-: DC15V
-: DC0~6.5V
-: Stop DC0 or 15V
Operation DC7.5V
(0~15V pulse)
CN01
Connect to the Terminal Block (TB4)
(Indoor/outdoor connecting line)
Between and 208/230V AC
CNP
Drain-pump output (DP)
(208/230V AC)
FUSE
6.3A /250V
29
10-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE
Each function is controlled by the dip switch and the jumper wire on control P.C. board.
SW1 and SW2 are equipped only for service parts.
Model setting and capacity setting are memorised in the nonvolatile memory of the indoor controller board.
(Marks in the table below)
Jumper wire
Functions
SW1
Model
settings
SW2
Capacity
settings
Setting by the dip switch and jumper wire
MODELS
PLA-A12BA
PLA-A18BA
PLA-A24BA
J41
J42
Pair number
setting with
wireless
remote
controller
JP1
Unit type
setting
JP3
Indoor
controller
board type
setting
: Short
: Open)
Remarks
Service
PLA-A·BA
MODELS
Jumper wire (
1 2 3 4 5
Service
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
ON
OFF
MODELS
ON PLA-A30BA
OFF
ON PLA-A36BA
OFF
ON PLA-A42BA
OFF
Service
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
ON
OFF
ON
OFF
ON
OFF
<Initial setting>
Wireless remote controller: 0
Control PCB: (for both J41 and J42)
Four pair number settings are supported.
The pair number settings of the wireless remote
controller and indoor control PCB (J41/J42) are
given in the table on the left.
(' ' in the table indicates the jumper wire is disconnected.)
Wireless remote Control PCB setting
controller setting
J41
J42
0
1
2
3~9
Model
Without TH5
With TH5
JP1
Indoor controller board type
Product
Service parts
There is no jumper (JP1) because these models
have the cond./eva. temperature thermistor (TH5).
JP3
30
11
SPECIAL FUNCTION
11-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION)
11-1-1. Operation
(1) Rotation function(and Back-up function)
Outline of functions
· Operating the unit of main and sub alternately according to the interval setting. (Rotation function)
+The setting of main/sub unit depends on the refrigerant address.(The setting of dip switch on the outdoor unit)
Refrigerant address"00"
Main unit
Refrigerant address"01"
Sub unit
· If an error occurrs to one unit, the other unit starts.(Back-up function)
System constraint
· This function is available only by the grouping control system(INDOOR UNIT : OUTDOOR UNIT=1:1) of 2 refrigerant
group.(Refer to Fig 1)
· It is necessary to connect remote controller crossover wiring to between units(Wireless remote controller is unusable) and
to assign refrigerant address to each unit.(Dip switch on the outdoor unit…Refrigerant address 00/01)
Fig 1
Operation pattern
Refrigerant address
"00"
Refrigerant address
"01"
[Back-up function only]··· Request code number "312"
Error occurred on main unit
Main
Sub
Start operation
Main
unit
IC-1
Sub
unit
IC-2
Run
Abnormal condition
Stop
Run
OC-2
OC-1
Main
unit
3(2)
3(2)
IC-2
IC-1
2
2
[Rotation function] & [Back-up function]··· Request code number "313~318"
RC
Start operation
Main
unit
IC-1
Sub
unit
IC-2
Main
Sub
Main
Error occurred on main unit
Sub Main
Sub
Abnormal condition
Run
Stop
Run
Stop
Run
Stop
1~28 days
OC: Outdoor unit
IC: Indoor unit
RC: Wired remote controller
Run
1~28 days
(Ex:When the request code number is "313", each unit operates alternately in daily cycle.)
(2) 2nd stage cut-in function
Outline of functions
· Quantity of operating units is controlled according to the room temperature and set point.
· When room temperature becomes more than set point, standby unit starts.(2 units running )
· When room temperature falls below set point -4(7.5°F), standby unit stops.(1 unit running)
System constraint
· This function is available only in rotation operation(or back-up) and cooling mode.
[2nd stage cut-in function]··· Request code number "322~324"
Start operation
Main
unit
,&
Sub
unit
,&
Room temp. Set point
Sub unit start operation
Room temp. < Set point -4Û&(7.5Û))
Sub unit stop
Run
Stop
Run
Stop
31
Sub
unit
11-1-2.How to perform the operation of rotation function(Back-up function, 2nd stage cut-in function)
Set by wired remote controller.(Maintenance monitor)
NOTICE
It is necessary to set the same content to both main unit and sub unit.
Every time indoor controller board is replaced for servicing, it is necessary to set each function.
(1) Request Code List
Rotation setting
Setting No.
(Request code)
No.1
(310)
No.2
(311)
No.3
(312)
No.4
(313)
No.5
(314)
No.6
(315)
No.7
(316)
No.8
(317)
No.9
(318)
Initial
setting
Setting contents
Monitoring the request code of current setting.
Rotation and Back-up OFF (Normal group control operation)
Back-up function only
Rotation ON (Alternating interval = 1day) and back-up function
Rotation ON (Alternating interval = 3days) and back-up function
Rotation ON (Alternating interval = 5days) and back-up function
Rotation ON (Alternating interval = 7days) and back-up function
Rotation ON (Alternating interval = 14days) and back-up function
Rotation ON (Alternating interval = 28days) and back-up function
2nd stage cut-in setting
Setting No.
(Request code)
No.1
(320)
No.2
(321)
No.3
(322)
No.4
(323)
Cut-in function ON (Set point = Set temp. +6Û&(10.8ÛF))
No.5
(324)
Cut-in function ON (Set point = Set temp. +8Û&(14.4ÛF))
Initial
setting
Setting contents
Monitoring the request code of current setting.
Cut-in function OFF
Cut-in function ON (Set point = Set temp. +4Û&(7.2ÛF))
32
(2) Setting method of each function by wired remote controller
B: Refrigerant address
C: Data display area
D: Request code display area
1. Stop running the air-conditioner(
).
2. Press the TEST button () for 3 seconds so that [Maintenance mode] appears on the screen (at ).
After a while, [00] appears in the refrigerant address number display area.(at )
3. 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.
[----] appears on the screen (at ) when [Maintenance monitor] is activated.
(The display (at ) now allows you to set a request code No.)
4. Press the [TEMP (
[Screen]
)] buttons () to select the desired refrigerant address.
and
5. Press the [CLOCK (
and
)] buttons () to set the desired request code No.(“311~318”, “321~324”,
“331~335”)
6. Press the FILTER button () to perform function setting.
If the above operations are set correctly, request code number will appear in data display area.(at )
[Example) When the request code number is "311", [311] appears on the screen.(at )]
[Refererence]
You can check the request code number of current setting by setting the request code number (“310”, “320” or “330”) and
press the FILTER button.()
[Example) When the current setting is "Setting No.2(Request code 311)", [311] appears on the screen.(at )]
7. To return to normal mode, press the ON/OFF button (
).
11-2. BACK-UP HEATING FUNCTION(CN24)
Temperature difference
= 6HWWHPS5RRPWHPS
11-2-1. Operation
Outline of functions
The back-up heater signal is sent out according to the temperature difference between indoor room temperature and set temperature. This function is available only in heating operation.
%DFNXSKHDWHU
signal output
1
Z Û&Û)
2))
2
=Û&Û)
Keeping condition
3
Û&Û)Z
ON
ON
11-2-2. How to connect
When connecting to the connector CN24 of the indoor unit, use
PAC-SE56RA-E(optional parts).
33
Z
0
2.5Û&Û)
2))
11
DISASSEMBLY PROCEDURE
PLA-A12BA PLA-A18BA
PLA-A12BA1 PLA-A18BA1
PLA-A24BA
PLA-A24BA1
PLA-A30BA
PLA-A30BA1
PLA-A36BA
PLA-A36BA1
PLA-A42BA
PLA-A42BA1
Be careful on removing heavy parts.
OPERATING PROCEDURE
PHOTOS & ILLUSTRATIONS
1. Removing the air intake grille
(1) Slide the knob of air intake grille toward the arrow to
open the air intake grille.
(2) Remove drop prevention hook from the panel.
(3) Slide the shaft in the hinge to the direction of the arrow and remove the air intake grille.
2. Removing the room temperature thermistor (TH1)
(1) Remove the air intake grille and the filter. (See Figure 1)
(2) Remove the 2 screws from the electrical box.
(3) Disconnect the connector CN20 (Red) from the indoor controller board.
(4) Remove the room temperature thermistor and holder.
3. Removing the indoor controller board (I.B)
(1) Remove the air intake grille and the filter. (See Figure 1)
(2) Remove the 2 screws from the electrical box cover.
(3) Disconnect the connectors :
CNMF (White/ 7P) for fan motor
CN44 (White/ 4P) for thermistor (TH2/ TH5)
CNP (Blue/ 3P) for drain pump
CN4F (White/ 4P) for float switch
CN01 (Black/ 5P) for earth and reactor
CNV (White/ 20P) for vane motor
(4) Remove the 6 supports from indoor controller board.
(5) Remove the indoor controller board.
Figure 1
Filter
Photo 1
Electrical box cover
Fixing screw
(Electrical box)
Photo 2
Bell mouth
Electrical box
Fixing screw
4. Removing the electrical box
(1) Remove the air intake grille and the filter. (See Figure 1)
(2) Remove the 2 screws from the electrical box cover.
(3) Disconnect the connectors. (Refer to 3.)
(4) Remove 2 electrical box fixing screws and remove 2 hooks.
(5) Pull the electrical box.
<Electrical parts in the electrical box>
Indoor controller board
Terminal block (TB4)(TB5)
Electrical box
34
Room temp.
thermistor (TH1)
Turbo fan
Indoor controller
board (I.B)
Electrical box
Fixing screw
OPERATING PROCEDURE
PHOTOS & ILLUSTRATIONS
5. Removing the fan and fan motor (MF)
(1) Remove the electrical box. (See photo 2)
(2) Remove the bell mouth (3 screws). (See photo 2)
(3) Remove the turbo fan nut.
(4) Pull out the turbo fan.
(5) Remove the wire cover (3 screws).
(6) Remove 2 wiring clamps.
(7) Disconnect the connector of the fan motor (CNMF).
(8) Remove the 3 nuts and washers and rubber mounts of the
fan motor.
Coil plate
Photo 3
Fan motor
Clamp
Wire cover
fixing screw
Nut
Washer
Rubber mount
6. Removing the panel
(1) Remove the air intake grille and the filter. (See figure 1)
(2) Disconnect the connector CNV (White/ 20P).
Corner panel (See figure 2)
(3) Remove the corner screw.
(4) Slide the corner panel to the direction of the arrow , and
remove the corner panel.
Panel (See photo 4, 5)
(5) Remove the 2 screws from the panel which fixes the oval
holes.
(6) Rotate the panel a little to come to the bell shaped hole
where the screw is large and remove the panel.
Figure 2
Screw
Detail Screw Corner panel
Panel
Corner panel
Photo 4
Photo 5
Ball shaped hole
Oval hole
7. Removing the drain pan
(1) Remove the air intake grille and the filter. (See Figure 1)
(2) Remove the 2 screws from the electrical box cover.
(3) Disconnect the connectors. (Refer to 3.)
(4) Remove the panel. (See photo 4, 5)
(5) Remove the electrical wiring service panel (3 screws).
(6) Remove the drain pump wire cover (1 screw).
(7) Remove the electrical box. (See photo 2)
(8) Remove the bell mouth. (See photo 2)
(9) Remove the 4 screws and pull out the drain pan.
+ Pull out the left and right of the pan gradually.
Be careful not to crack or damage the pan.
Photo 6
Drain pump wire cover
Drain pan
fixing screw
Drain pan
fixing screw
Electrical wiring
service panel
Drain pan
fixing screw
Drain pan
Electrical wiring service panel fixing screw
8. Removing the pipe temperature thermistor (TH2)
and condenser evaporator temperature thermistor (TH5)
(1) Remove the drain pan. (See photo 6)
(2) Remove the turbo fan. (See photo 3)
(3) Remove the 2 wiring clamps. (See photo 3)
(4) Remove the coil plate (2 screws).
(5) Remove the thermistors which are inserted into the holders
installed to the thin copper pipe.
(6) Disconnect the 4-pin white connector (CN44).
35
Photo 7
Liquid pipe temp.
thermistor (TH2)
Cond./ eva. thermistor
(TH5)
OPERATING PROCEDURE
9. Removing the drain pump (DP) and float switch (FS)
(1) Remove the drain pan. (See photo 6)
(2) Cut the hose band and remove the hose.
(3) Remove the drain pump assembly (3 screws and 2 hooks).
(4) Remove the drain pump (3 screws).
(5) Remove the float switch (2 screws).
PHOTOS & ILLUSTRATIONS
Photo 8
Float switch
Hose band
Drain pump
Photo 9
Drain pump
assembly fixing screw
Drain pump
fixing screw
Float switch
fixing screw
10. Removing the heat exchanger
(1) Remove the drain pan. (See photo 6)
(2) Remove the 3 screws of the piping cover, and pull out
piping cover.
(3) Remove the 2 screws of coil plate.
(4) Remove the 2 screws of the coil.
(5) Remove the screw of the coil support.
(6) Pull out the heat exchanger.
Photo 10
Piping cover
Coil plate
Heat exchanger
fixing screw
Heat exchanger
Coil support
fixing screw
Coil support
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Oct. 2007 No.OCH420 REVISED EDITION-A PDF 9
Distributed in Jul. 2007 No.OCH420 PDF 9
Made in Japan
New publication, effective Oct. 2007
Specifications subject to change without notice.
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