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6.
INVERTER MULTI-SPLIT SYSTEM
ROOM AIR-CONDITIONER[2room]
(Air to air heat pump type)
CONTENTS
GENERAL INFORMATION ........................................................................ 193
How to read the model name ............................................................. 193
Range of usage & limitations ............................................................. 198
Exterior dimensions............................................................................ 199
OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............. 205
Installation of indoor unit ................................................................... 216
Installation of remote controller ........................................................ 218
Installation of outdoor unit................................................................. 219
Test run and handling instruction ..................................................... 223
MAINTENANCE DATA ............................................................................... 224
192
6.1
GENERAL INFORMATION
6.1.1
Specific features
(1) Equipped with an inverter scroll compressor.
¡Low noise. Low vibration and compact.
(2) The long piping makes the location of the inside and units flexible.
¡No need for additional charge of refrigerant : 20 m
¡Maximum piping length : 30 m
(3) Connectable indoor capacity
Number of connectable units : 1 to 2 units
Total of indoor units (class kW) : 6.5 kW
(4) Indoor units are available with 5 capacities.
5 capacities ········ 22, 25, 28, 32, 40
(5) Inverter (Frequency converter) for multi-steps power control
¡Heating / Cooling
The rotational speed of a compressor is changed in step in relation to varying load, to interlock with the indoor and outdoor unit fans controlled to changes in frequency, thus controlling the power.
¡Allowing quick heating/cooling operation during start-up period. Constant room temperature by fine-tuned control after the unit has stabilized.
(6) Fuzzy control
Fuzzy control calculates the amount of variation in the difference between the suction air temperature and the setting temperature in compliance with the fuzzy rules in order to control the air capacity and the inverter frequency.
(7) Self diagnosis function
We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as
6.1.2
How to read the model name
Example : SK M 25 Z A
Series No.
Inverter and heat pump type.
Product capacity
Multiple system
Model name
SK : Wall mounted type
SC : Outdoor unit
193
6.2
SELECTION DATA
6.2.1
Specifications
(1) Indoor unit
Models SKM22ZA, 25ZA, 28ZA, 32ZA, 40ZA
Models
SKM22ZA SKM25ZA SKM28ZA SKM32ZA SKM40ZA
Item
Cooling capacity
Heating capacity
Noise level
Cooling
Heating
Sound level
Power level
Sound level
Power level
W
W dB
2200
3200
Hi : 38 Lo : 29
Hi : 52 Lo : 43
2500
3400
Hi : 39 Lo : 30
Hi : 53 Lo : 44
2800
4000
Hi : 39 Lo : 31
Hi : 53 Lo : 45
Hi : 40 Lo : 32
Hi : 54 Lo : 46
3200
4500
Hi : 40 Lo : 30
Hi : 54 Lo : 44
Hi : 41 Lo : 32
Hi : 55 Lo : 46
4000
5400
Hi : 42 Lo : 31
Hi : 56 Lo : 45
Hi : 42 Lo : 32
Hi : 56 Lo : 46
Exterior dimensions
Height
×
Width
×
Depth
Color
Net weight
Air handling equipment
Fan type & Q’ty
Motor
Air flow (at high)
Air filter, Q’ty
Operation switch
Room temperature control
Pilot lamp
Safety equipment
Cooling
Heating
Refrigerant piping
Liquid line
O.D
Gas line
Connecting method
Attached length of piping
Insulation
Drain hose
Accessories (including)
Optional parts
Outdoor units to be combined mm kg
W
CMM mm (in)
250
×
750
17
7.0
7.5
×
178
7.5
7.7
9.1
Polypropylene net
×
2 (Washable)
Wireless-Remote controller
M.C thermostat
18
9.0
10
RUN (Green), TIMER (Yellow)
Frost protection, Serial error protection
Fan motor error protection
φ
6.35 (1/4
″
)
φ
9.52 (3/8
″
)
275
Ivory white
Tangential fan
—
SCM45ZA
×
Connectable
Mounting kit
1
Flare connecting
Notes (1) The data are measured at the following conditions.
Operation
Cooling
Heating
Item
DB
Indoor air temperature
27ºC
20ºC
WB
19ºC
–
Outdoor air temperature
DB WB
35ºC
7ºC
24ºC
6ºC
(2) Capacity indicated is the rated capacity with one unit operating under ISO-T1 standards conditions.
×
790
Liquid line : 0.4m Gas line : 0.35m
Necessary (Both Liquid & Gas lines)
×
174
8.0
φ
12.7 (1/2
″
)
9.5
10
Standards
ISO-T1, JIS C9612
ISO-T1, JIS C9612
194
(2) Outdoor unit
Model SCM45ZA
Model
Exterior dimensions
Height
×
Width
×
Depth
Color
Net weight
Refrigerant equipment
Compressor type & Q’ty
Motor
Starting method
Refrigerant control
Refrigerant
Refrigerant oil
Air handling equipment
Fan type & Q’ty
Motor
Air flow (at high)
Shock & vibration absorber
Safety equipment
Size
×
Core
×
Number
Refrigerant piping
Connecting method
Attached length piping
Insulation
Power source supply
Connection wiring
Size
×
Core number
Connecting method
Accessories (included)
Indoor units to be combined
Cooling
Heating
Cooling
Heating
Sound level
Power level
SCM45ZA
Item
Cooling capacity
Heating capacity
Power source
Power consumption
Running current
Noise level
W
W
W
A dB mm kg kW kg
R
W
CMM mm (in)
4500 (2000 ~ 5100)
5600 (2200 ~ 6000)
1 Phase 220/240V 50Hz
1820 (680 ~ 2050)
1950 (650 ~ 2190)
8.4/7.7
9.0/8.2
Cooling : 46 Heating : 48
Cooling : 60 Heating : 62
595
×
720
×
290
Stucco white
36
GR5490FD41
×
1
1.2
Direct start
Capillary tubes
+
Electric expansion valve
R22 1.3 (Pre-charged up to the piping length of 20m)
0.45 (BARREL FREEZE 32SAM)
Propeller fan
×
2
24
30
Rubber (for compressor)
Compressor overheat protection, Overcurrent protection
High pressure protection, Serial signal error protection
Liquid line:
φ
6.35 (1/4
″
)
×
2
Gas line:
φ
9.52 (3/8
″
)
×
2
Flare connecting
—
Necessary (Both Liquid & Gas lines)
Terminal block (Screw fixing type)
1.5 mm 2 ×
4 cores (Including earth cable)
Terminal block (Screw fixing type)
Union : (
φ
9.52 / φ
12.7)
×
1
Installation sheet, Manual instruction
SKM22, 25, 28, 32, 40 type
Notes (1) The data are measured at the following conditions.
Operation
Cooling
Heating
Item
DB
Indoor air temperature
27ºC
20ºC
WB
19ºC
–
Outdoor air temperature
DB WB
35ºC
7ºC
24ºC
6ºC
(2) The values for capacity and power consumption shown in a range ( ) indicate the minimum and maximum of the range.
(3) If the piping length exceeds 20 m, additional charging is required. (20g/m)
Standards
ISO-T1, JIS C9612
ISO-T1, JIS C9612
195
(3) Operation data
¡ The combinations of the indoor units is indicated by numbers. They are read as follows.
(Example) SKM22ZA / 22 SKM40ZA / 40
¡ The capacity of the indoor units is shown by rooms. If this exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed.
¡ If units are to be combined, use the table below to make the proper selection.
(a) Heating
Heating capacity (kW) Power consumption (W)
(220/240V)
Running current (A)
Indoor unit combination
1 room
2 room
22
25
28
32
40
22+22
22+25
22+28
22+32
22+40
25+25
25+28
25+32
25+40
196
(b) Cooling
Indoor unit combination
1 room
2 room
22+32
22+40
25+25
25+28
25+32
25+40
40
22+22
22+25
22+28
22
25
28
32
Cooling capacity (kW) Power consumption (W)
(220/240V)
Running current (A)
197
6.2.2
Range of usage & limitations
Model
Item
Indoor intake air temperature
(Upper, lower limits)
Outdoor air temperature
(Upper, lower limits)
Indoor units that can be used in combination
Number of connected units
Total of indoor units (class kW)
Total length for all rooms
Length for one indoor unit
Difference in height between indoor and outdoor units
When above outdoor unit (B)
When below outdoor unit (A)
Difference in height between indoor units (C)
Compressor stop/start frequency
1 cycle time
Stop time
Power source
voltage
Voltage fluctuation
Voltage drop during start
Interval unbalance
SCM45ZA
Refer to the selection chart.
1 to 2 units
6.5kW
Max. 30m
Max. 25m
Max. 10m
Max. 15m
Max. 25m
6 min or more (from stop to stop or from start to start)
3 min or more
Within
±
10% of rated voltage
Within
±
15% of rated voltage
Within
±
3% of rated voltage
A
B
C
198
6.2.3
Exterior dimensions
(1) Indoor unit
Models SKM22ZA, 25ZA
A
750
75
150
615
450 150
65
Room temp. thermistor
Unit: mm
178 3
Piping hole right (left)
Terminal block
49
62
60
746.9
16
62
92
Model SKM28ZA
A
40
Piping for Gas ( Ø 9.52) 370
Piping for Liquid ( Ø 6.35) 420
Piping hole
( Ø 65)
Piping hole
( Ø 65)
790
7.5
Room temp. thermistor
174 3
VIEW A
Unit: mm
Piping hole right (left)
7.5
15
170
760
450 170
15
Terminal block
49
60
780
16
62 18
67
Piping hole
( Ø 65)
Piping for Gas
( Ø 9.52) 390
51
Piping for Liquid ( Ø 6.35) 440
Drain hose 600 ( Ø 16)
Piping hole
( Ø 65) VIEW A
199
Models SKM32ZA, 40ZA
A
15
170
790
760
450
Room temp. thermistor
174 3
Piping hole right (left)
Unit: mm
170
15
Terminal block
49
60
780
16
62 18
67
Piping hole
( Ø 65)
51
Piping for Gas
( Ø 12.7) 390
Piping for Liquid ( Ø 6.35) 440
Drain hose 600 ( Ø 16)
Piping hole
( Ø 65)
(2) Outdoor unit
Model SCM45ZA
256
Drain hole 50
12
VIEW A
87
411.5
720
510 123
62
19
Elongated hole
(2-16
×
12)
88.2
Liquid line service valve B Unit
(ø6.35)
Liquid line service valve A Unit
(ø6.35)
Ground terminal
Terminal block
29.7
Gas line service valve B Unit
(ø9.52)
35
° 35
°
Gas line service valve A Unit
(ø9.52)
200
6.2.4
Piping system
Model SCM45ZA
Gas line
Indoor unit
Heat exchanger
Liquid line
Outdoor unit
(ø9.52)
Service valve
(Gas)
(ø9.52)
Check joint
Thermistor
(Th
O
-D)
(ø6.35)
(ø6.35)
Thermistor
(Th
(Th
I
I
-A)
Thermistor
-R)
Service valve
(Liquid)
Strainer
4 way valve
Muffler
Discharge
Compressor
Accumulator
Suction
Capillary tube
Electric expansion valve
EEVA
EEVB
Thermistor
(Th
O
-A)
Cooling cycle
Heating cycle
Heat exchanger
Thermistor
(Th
O
-R)
201
6.2.5 Selection chart
Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be obtained in the following way.
Net capacity = Capacity shown on specification ✕ Correction factors as follows.
(1) Coefficient of cooling and heating capacity in relation to temperatures
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
Cooling
Heating
Applicable range
30
25
20
15
43
40
35
24
14 16 18 20
Indoor air W.B. temperature ° C W.B.
ISO-T1 Standard Condition
22
27
25
20
15
10
20
-10 -5 0
Outdoor air W.B. temperature ° C W.B.
5 10
ISO-T1 Standard Condition
15
(2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor units.
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
20
0.965
1.0
25
0.95
1.0
(3) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (1), (2) the heating capacity needs to be adjusted also with respect to the frosting on the outdoor heat exchanger.
Air inlet temperature of outdoor unit in ˚C WB
Adjustment coefficient
-10
0.95
-9
0.94
-7
0.93
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00
202
6.3
ELECTRICAL DATA
Meaning of marks
• Outdoor Unit
Symbol
CM
FM
0
L
DS
EEVA, B
20S
Parts name
Compressor motor
Fan motor
Reactor
Diode stack
Electric expansion valve
4 way valve (coil)
• Indoor Unit
FM
I
CF
I
Symbol
SM
TR
ZNR
Fan motor
Parts name
Capacitor (for FM
I
)
Flap motor
Transformer
Varistor
Symbol
Tho-A
Tho-R
Tho-D
LED2
LED1, 3
Parts name
Thermistor (outdoor air temp.)
Thermistor (outdoor H.X temp.)
Thermistor (comp. dome temp.)
Warning lamp (Red)
Serial signal lamp (Green)
Symbol
Q
F
Th
I
-A
Th
I
-R
Parts name
Fan motor control triac
Fuse
Thermistor (Room temp.)
Thermistor (Indoor H. X temp.)
6.3.1
Electrical wiring
(1) Indoor unit
Models SKM22ZA, 25ZA, 28ZA, 32ZA, 40ZA
FM
I
TR
RD RD
CNW
BL
GR
PP
Y
WH
RD
CNU
CF
COM
FM
I
CNC
CF
I
CNB
BK BK
S
ZNR
R
F (250V · 3.15A)
J
RD
WH
BK
Y/GN
3
2
1
Q
Power line
(Outdoor unit)
BK
BL
GR
Y
RD
WH
PP
Y/GN
Color symbol
Black
Blue
Gray
Yellow
Red
White
Purple
Yellow/Green
SM CNM Printed circuit board
CNE CND
Back up switch
CNG
Display
Wireless
R-Amp
Th
I-
A Th
I-
R
203
(2) Outdoor unit
Model SCM45ZA
L
Power source
1 Phase
220/240V
50Hz
UNIT A
UNIT B 2
3
3
1
1
2
BK
WH
RD
BK
WH
BL
Serial A
52X2-4
BL
Serial B
S. OUT
GY
R. IN
S. IN
Fuse
250V 25A
1
2
BK
WH
Y/GN
Y/GN
G
CNB
Printed circuit board
CNA
AC·R
~ +
AC·S
~
DS
–
CNB
CNE
WH
LED1 LED3 LED2
(Green) (Red)
CNF
OR
IC2
+
CNA
+ + +
Power transistor
Printed circuit board
P
N
CND
U RD
V
W
WH
BK
CNC
CM
BK
BL
GY
RD
WH
OR
Y/GN
Color symbol
Black
Blue
Gray
Red
White
Orange
Yellow/Green
20S EEVA EEVB FMo
Tho-A Tho-R Tho-D
204
6.4
OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
(1) Remote Controller
FAN SPEED indicator
Indicators the ¡ for the fan speed which has been set.
HI POWER operation indicator
Indicators during HI POWER operation.
ECONOMY operation indicator
Indicators during ECONOMY operation.
Operation switch over indicator
Indicators the ¡ for the operation which has been set.
AIR FLOW indicator
Indicator selected flap mode.
ON-TIMER • OFF-TIMER indicator
FAN SPEED button
Each time the button is pushed, the ¡ indicator is switched over in turn.
HI POWER button
This button changes the HI POWER operation.
SET TEMPERATURE button
This button sets the room temperature.
CONT HI POWER ECONO
AUTO
HI
MED
LO
ON OFF TIMER
FAN SPEED ON/OFF MODE
HI POWER TEMP AIR FLOW
ECONO SET TIMER TIMER
ACL
OPERATION MODE select button
Each time the button is pushed, the ¡ indicator is switched over in turn.
ON/OFF button
This button, when pressed, starts operation and stops when repressed.
AIR FLOW button
This button changes the flap mode.
ECONOMY button
This button changes the ECONOMY operation.
TIMER button
The button selects ON TIMER operation,
OFF-TIMER operation or normal operation.
SET TIMER button
This button sets the ON TIMER time or SLEEP time.
Reset switch
Switch for resetting microcomputer.
¡ Above figure shows all indications for the purpose of explanation, but practically only the pertinent parts are indicated.
Heat pump model : [ (AUTO) · (Cool) · (Heat) · (Dry)]
Cooling only model: [ (AUTO) · (Cool) · (Fan) · (Dry)]
(2) Indoor unit indicator
Models SKM22, 25 models
RUN
TIMER
Models SKM28, 32, 40 models
RUN (HOT KEEP) lamp (green)
• Illuminates during operation.
• Flashs at stop blowing due to the hot keep.
TIMER RUN
INVERTER
TIMER lamp (yellow)
Illuminates during TIMER operation.
INVERTER
205
(3) Back-up switch
When the remote controller become weak, or if the remote controller is lost or malfunctioning, this switch may be used to turn the unit on and off.
(a) Operation
Push the switch once to place the unit in the automatic mode. Push it once more to turn the unit off.
(b) Detail of operation
Operation starts in the same way as the previous operation.
Models SKM22, 25 models Models SKM28, 32, 40 models
ON/OFF button
ON/OFF
(4) Flap control
Control the flap by AIRFLOW button on the wireless remote control.
(a) Natural flow (AUTO)
The flap will be automatically set to the angle of air flow best to operation.
1) Starting time of operation s
In case of cooling and dry operation t s
In case of heating operation t
Stops at the level position for one minute.
Sway operation
Sway operation
ON/OFF button
¡ The flap operation as shown above will be repeated.
¡ The flap operation as shown above will be repeated.
2) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(b) Memory flap (Only case of SKM28, 32, 40 models)
While the flap is operating if the AIRFLOW button is pushed once, it stops swinging at an angle.
As this angle is memorized in the microcomputer, the flap will be automatically set to the angle when next operation is started.
◆ Recommendable stopping angle of the flap
HEAT
Slant forward blowing
Horizontal blowing
COOL•DRY
206
(c) Swing flap
Flap moves in upward and downward directions continuously.
(5) Comfort timer setting
If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfort timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the room temperature at the setting time (temperature of room temperature thermistor) and the setting temperature. (Max. 60 minutes)
Operation mode
At cooling
At heating
3 < Room temp. – Setting temp.
+5
3 < Setting temp. – Room temp.
+5
Operation start time correction value (Min.)
No change
No change
–5
–5
Notes (1) At 5 minutes before the timer ON time, operation starts regardless of the temperature of the room temperature thermistor (Th
I
-A).
(2) This function does not actuate when the operation select switch is set at the dehumidifying as well as the dehumidifying in the auto mode.
However, the operation of item (1) above is performed during the dehumidifying in the auto mode.
(3) During the pleasant reservation operation, both the operation lamp and timer lamp illuminate and the timer lamp goes off after expiration of the timer, ON setting time.
(Example) Heating Corrects the starting time of next operation by calculating the temperature difference.
Setting temperature
Room temperature
Operation starting time
¡ If the difference (= Setting temperature – Room temperature) is 4ºC, the correction value is found to be
+5 minutes from the table shown above so that the starting time of next operation is determined as follows:
15 min. earlier + 5 min. = 20 min. earlier
Current operation
↑
Correction value start time
Time 15 min.
10 min.
earlier earlier
5 min.
earlier
Setting time
(6) Cooling operation
(a) Summary
1) Capacity control
Model
Capacity
SCM45ZA
2.0 ~ 5.1 kW
SCM45YA
2.0 ~ 5.1 kW
Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed.
2) Outdoor unit speed control (28 ~ 120 rps)
Indoor unit instruction total speed value
28 rps or less
More than 28 rps, but 120 rps or less
More than 120 rps
Decision speed
28 rps
28 to 120 rps
120 rps
Note (1) The indoor unit instruction total speed value is the total of the values from each unit in item (b).
(b) Mode switching
Within the selected mode, the unit operates using the values shown below which were obtained by multiplying a conversion coefficient to the indoor unit instruction speed.
(rps)
Model (Indoor)
Operation Mode
Automatic
High
Medium
Low
Hi power
Econo
22
28 ~ 58
28 ~ 58
28 ~ 44
28 ~ 30
58
28 ~ 34
25
28 ~ 68
28 ~ 68
28 ~ 50
28 ~ 32
68
28 ~ 36
28
28 ~ 88
28 ~ 88
28 ~ 60
28 ~ 30
86
28 ~ 50
32
28 ~ 96
28 ~ 96
28 ~ 70
28 ~ 34
96
28 ~ 40
40
28 ~ 110
28 ~ 118
28 ~ 100
28 ~ 40
108
28 ~ 50
207
(c) Operation of Major Functional Components in Cooling Mode
Functional components
Operation
Instruction speed
Indoor unit fan
Fixed
Automatic According to instruction speed According to mode switching
OFF Outdoor unit fan
Electronic expansion valve
Compressor
Cooling
See preceding table
According to outdoor unit speed
According to decision speed
ON
Thermostat OFF
(All indoor units)
0
(All indoor units)
Thermostat OFF
(Some of indoor units)
Fan, stop, abnormal stop
(Some of indoor units)
0
(Thermostat off units)
According to mode switching
0
(Fan, stop, abnormal stop units)
According to stop mode
OFF
All closed
(Thermostat off units)
ON
First speed or low
According to outdoor unit speed
All closed
(Fan, stop, abnormal stop units)
ON
Failure
(Outdoor Unit)
0
(All units)
OFF
According to stop mode
OFF
(7) Heating Operation
(a) Summary
1) Capacity control
Model
Capacity
SCM45ZA
2.2 ~ 6.0 kW
Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed.
2) Outdoor unit speed control (28 ~ 134 rps)
Indoor unit instruction total speed value
28 rps or less
More than 28 rps, but 120 rps or less
More than 120 rps, but 134 rps or less
More than 134 rps
Decision speed
28 rps
28 to 120 rps
120 to 134 rps
134 rps
Note (1) The indoor unit instruction total speed value is the total of the values from each unit in item (b).
(b) Mode switching
Within the selected mode, the unit operates using the values shown below which were obtained by multiplying a conversion coefficient to the indoor unit instruction speed.
(rps)
Model (Indoor)
Operation Mode
Automatic
High
Medium
Low
Hi power
Econo
22
28 ~ 74
28 ~ 74
28 ~ 50
28 ~ 34
76
28 ~ 42
25
28 ~ 80
28 ~ 80
28 ~ 58
28 ~ 36
82
28 ~ 44
28
28 ~ 120
28 ~ 120
28 ~ 86
28 ~ 46
120
28 ~ 60
32
28 ~ 126
28 ~ 126
28 ~ 92
28 ~ 46
120
28 ~ 54
40
28 ~ 134
28 ~ 134
28 ~ 126
28 ~ 54
126
28 ~ 64
(c) Operation of Major Functional Components in Heating Mode
Functional components
Operation
Heating
Thermostat OFF
(All indoor units)
Thermostat OFF
(Some of indoor units)
Fan, stop, abnormal stop
(Some of indoor units)
Failure
(Outdoor Unit)
Instruction speed See preceding table
0
(All indoor units)
0
(Thermostat off units)
0
(Fan, stop, abnormal stop units)
0
(All units)
Indoor unit fan
Fixed
Automatic
Outdoor unit fan
Electronic expansion valve
According to mode switching
According to instruction speed
According to outdoor unit speed
According to decision speed
Compressor ON
Hot Keep
Hot Keep
According to mode switching
According to instruction speed
Hot Keep
Hot Keep
OFF According to outdoor unit speed OFF
According to stop mode
After 4 minutes all closed: 58 pulse
(Thermostat off units)
58 Pulse
(Fan, stop, abnormal stop units)
According to stop mode
OFF ON ON OFF
208
(d) Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor fan is controlled based on the temperature of the indoor unit heat exchanger (detected with Th
I
-R, indoor unit heat exchanger thermistor) to prevent blowing of cool wind.
¡ Normal mode (Normal heating operation, operation after HI POWER completion)
7th speed
Indoor fan
3rd speed
2nd speed
1st speed
4th speed
5th speed
6th speed
¡ Values of a, b
At 0 rps command
Other than 0 rps command
A
22
17
B
25
19
Indoor heat exchanger temp. (˚C)
Note (1) Refer to the table shown above right for the values A and B.
¡ Hot keep M mode [During HI POWER operation (for 15 min.)]
7th speed
Indoor fan
4th speed
5th speed
6th speed
3rd speed
1st speed
2nd speed
Indoor heat exchanger temp. (˚C)
(e) Defrosting
(i) When the following conditions are met, the defrosting operation will start.
1) During normal operation a) When 40 minutes has passed since the start of heating or 40 minutes after the last defrosting (based on cumulative operation time of compressor).
b) When the outdoor heat exchanger thermistor (Tho-R) temperature is –2
°
C or less for 3 continuous minutes after 37 minutes have passed.
c) Outdoor temperature thermistor (Tho-A) – outdoor heat exchanger thermistor (Tho-R) temperature 0.44
× outdoor temperature thermistor (Tho-A) temperature + A
°
C or more.
A = Outdoor temperature – 2
°
C: 4, outdoor temperature < – 2
°
C: 6.
d) When the compressor is operating.
u Or, during heating, defrosting will start when the decision speed counts zero (0) rps for 10 times or more and all conditions in a), b) and d) have been satisfied.
2) During defrosting acceleration a) When 40 minutes has passed since the last defrosting (based on cumulative operation time of compressor).
b) When the compressor is operating.
u Or, during heating, defrosting will start when the decision speed counts zero (0) rps for 10 times or more and all conditions in a) and b) have been satisfied.
Note (1) Defrosting acceleration is when the finishing of the previous defrosting is according to the defrosting conditions of the 10 minutes that have passed.
209
3) Operation of function component in defrosting
Outdoor unit speed
80 rps
Decision speed
0 rps
Decision speed
Notes (1) Indoor unit fan is in response to Hot
Keep.
(2) Outdoor unit fan starts 6 seconds after the start of the compressor.
Outdoor unit fan
4-way valve
According to rps
OFF
ON
OFF
Electronic expansion valve
EEVA,B
(Operating unit)
EEV control
Electronic expansion valve
EEVA,B
(Stopped unit)
Opening in relation to conditions
Start of defrost operation
80 sec.
When 2 units are operating:
150 pulse
When 1 unit is operating:
200 pulse
200 pulse
Fully closed
Calculated start
Opening in relation to conditions
Defrost operation Defrost end operation
80 sec.
Defrost end conditions
4) Conditions for finishing defrosting
When any of the following conditions is met, the defrosting finishing operation will start.
1 When the temperature of the outdoor heat exchanger thermistor (Tho-R) is 9
°
C or more.
2 When 10 minutes has passed after the start of defrosting.
(8) Determining the operating mode
The cooling and heating operating modes are the remote control switch mode that have been previously determined.
If a mode differing from these is selected after this, the selected mode will appear in the display of the remote control, but only the fan will operate.
Example
1
2
Selected Mode
Cooling
Heating
First operation
Remote Control Display
Cooling
Heating
Operation
Cooling
Heating
Selected Mode
Heating
Second operation
Remote Control Display
Heating
Cooling Cooling
Operation
Fan (1)
Fan
Notes
• Different mode is only fan operation.
Note (1) If the display shows heating and the operation is fan, Hot Keep will operate.
Example of operating pattern
A unit
Cooling switch
ON
Cooling
Heating switch
ON
Fan Heating
B unit
Heating switch
ON
Operation Operation
Fan
Cooling switch
ON
Operation Operation
Cooling
Heating switch
ON
Heating
Operation
Note (1) [ ] indicates currect operation.
210
(9) Control and protection functions
(a) Start of protection for compressor
When the decision speed becomes a speed other than 0 rps and when the compressor is starting operation, an inverter decision speed of 40 rps or less indicates four-way valve switching protection and a speed of 40 rps or more indicates that protection of the compressor has started.
1) Start of protection for compressor a) After the compressor has started, the speed of the outdoor unit will reach a maximum value of 56 rps for 1 minute and 45 seconds.
b) During this time, if the decision speed exceeds 56 rps, operation will be at 56 rps; if it is 56 rps or less, operation will be at the decision speed or operation with 4-way valve switching protection.
c) The outdoor unit fan speed operates according to outdoor unit speed.
d) If restarting after a thermostat stop, the protection function for the outdoor unit operates and when restarting after the inverter stop, compressor protection is not started.
e) During the start of protection, current safe and compressor overheat have priority.
2) 4-way valve switching protection
Four-way valve switching protection is performed so that four-way valve switching will be performed smoothly.
a) When the decision speed starts at less than 40 rps, it forces the decision speed to operate at 40 rps for 30 seconds.
b) After 30 seconds, the speed of the outdoor unit is transferred to the decision speed.
c) This function applies to all units starting from an outdoor unit speed of 0 rps.
d) Current safe and compressor overheat protection are enabled even when this function is in operation.
(b) Heating overload protection control
During heating operation, if the outdoor unit is operating at a speed at 28 rps or more and the outdoor temperature is 12
°
C or more for 30 continuous seconds, current safe control is performed.
Operation is restored when the outdoor temperature is 10
°
C or less.
(c) Cooling overload protection control
During cooling operation, if the outdoor unit is operating at a speed at 28 rps or more and the outdoor temperature is 39
°
C or more for 3 continuous minutes, current safe control is performed by turning the outdoor fan dial up by 1 unit. Operation is restored when the outdoor temperature is 38
°
C or less.
(d) Heating thermostat OFF control
When there is a heating operation being performed for one room while a heating thermostat OFF is being performed in another room, the following controls are performed to prevent overheating.
1) This control is performed when all of the following conditions have been satisfied.
a) Compressor: During operation (determined speed 28 rps or more) b) One room serial signal: Operating mode – heating, command speed: other than 0 rps.
c) Other room serial signal: Operating mode – heating, command speed: 0 rps.
2) Description of control
Remarks Functional components
Outdoor unit speed
Operation of each functional components
Decision rps
Actual operating speed Decision rps
Outdoor unit fan
According to outdoor rps
EEV A, B Operating unit compatible
EEV A, B Heating
0 rps compatible Fully closed
58 pulse
4 min
Start of control Release of control
211
212
(e) High pressure cut protection control
The high pressure cut protection operates during heating operations when a “heating 0 rps” serial signal is received from one of the two operating indoor units.
1 When only one of two operating units sends a “heating 0 rps”signal.
Remarks Functional components
Indoor unit instruction speed
A room
Operation of each functional components
0 rps instruction
2 min.
Calculated rps
0 rps
B room
Calculated rps
0 rps
Decision rps
Actual operating speed
Instruction speed from indoor unit that has “heating 0 rps”.
Instruction speed for indoor unit that has “other than heating 0 rps”.
Outdoor unit fan
4-way valve
EEVA
EEVB
According to outdoor rps
OFF
ON
OFF
According to outdoor rps
Fully closed
According to outdoor rps
58 pulse or
EEV control
Corresponding expansion valve for unit with serial signal that has
“heating 0 rps”.
Corresponding expansion valve for unit with serial signal that has
“other than heating 0 rps”.
2 When decision speed becomes 0 rps during high pressure cut protection control
Functional components Operation of each functional components
Indoor unit instruction speed
A room
B room
Calculated rps
0 rps
Decision rps
Actual operating speed
0 rps instruction
Calculated rps
0 rps
0 rps instruction
Outdoor unit fan
4-way valve
0 rps
According to outdoor rps
OFF
ON
OFF
2 min.
EEVA
EEVB
According to outdoor rps
Fully closed
According to outdoor rps
200 pulse
2 min. 25 sec.
200 pulse
Fully closed
Remarks
The sequence for o rps instruction shows one example.
(f) Low Hz continuous operation protection control
The following controls are performed to return oil to the compressor when the outdoor unit speed of 28 rps or more to 40 rps or less is continuously operated for 20 minutes.
1) The decision speed is forced to operate at 40 rps for 2 minutes.
2) The outdoor fan and electronic expansion valve are operated according to the outdoor unit speed.
3) If there is an instruction exceeding 40 rps during this forced 40 rps operation, this control ends and the operation follows that instruction.
(g) Heating low temperature protection control
The following controls are performed when the outdoor unit is in heating operation at a speed other than 0 rps and the outdoor temperature is 2
°
C or less for 1 continuous minute.
1) The outdoor unit fan speed is forced to 5th speed.
2) This control is ended when the outdoor temperature reaches 4
°
C or more.
(h) Current safe control
1) When converter in port current is detected at the current sensor (CT) and it exceeds the set amperage, the speed is reduced
2 rps. This is rechecked after one second and if it still exceeds the set amperage, the speed is reduced another 2 rps.
2) If the actual speed operated at 28 rps or less, the inverter is stopped. It is restarted after a 3 minute delay. However, if it is restarted repeatedly within an interval of 1 hour, it will not start on the 5 times.
(i) Current cut
This detects converter output current at the shunt resistor and if it exceeds the set value, the inverter is stopped. It is restarted after a 3 minute delay. However, if the current cut operates again when the actual speed is less than 20 rps, it will not start on the 4 times.
(j) Compressor overheat protection
The detection temperature of the compressor dome thermistor (Tho-D) is used to prevent oil deterioration and damage to the motor wire due to overheating of the compressor.
1) If Tho-D becomes 125
°
C, the inverter is stopped. After the stop mode has been activated, the inverter will be restarted when Tho-D becomes < 95
°
C. However, if it is restarted repeatedly within an interval of 1 hour, it will not start on the 3 times.
2) When 105
°
C Tho-D < 125
°
C, the following outdoor unit speed controls are performed.
Decision speed
Inverter
6 minutes of more has passed (3)
6 minutes of more has passed (3)
6 minutes of more has passed (3) Lower limit 28 rps
8 rps
8 rps or 2 rps (2)
8 rps or 2 rps (2)
0 rps
95
Compressor doom temperature (
°
C)
105 125
Notes (1) If the temperature of the compressor dome is 105
°
C or more and less than 125
°
C, the outdoor unit speed is reduced by 8 rps.
(2) After 20 seconds, if the temperature of the compressor dome has decreased, it is lowered 2 rps. If the temperature has risen or is the same, it is lowered another 8 rps.
(3) If the temperature of the compressor dome is 95
°
C or more and less than 105
°
C, the speed of the outdoor unit is maintained. If operation is maintained at the same speed for 6 minutes or more or if the temperature is 95
°
C or less, control is returned to normal operation.
(k) Serial transmission abnormality protection
If the compressor is operating with an outdoor speed other than 0 rps and a serial signal cannot be received from all indoor controls with outdoor controls having serial signals other than “stop - 0 rps” continuously for 1 minute and 55 seconds, the inverter is stopped.
After the inverter has been stopped, it will be restarted after the compressor start delay if a serial signal can be received again from the indoor control.
213
(l) Compressor lock
If the motor for the compressor does not turn a half a turn approximately 0.3 seconds after it has been started, it is determined that a compressor lock has occurred and the inverter is stopped.
(m) Compressor dome thermistor broken wire protection control
1) When the outdoor unit speed is other than 0 rps and after the compressor has started to operate, if after 10 minutes there is a compressor dome thermistor temperature10-second interrupt signal (less than 7
°
C), it is immediately placed in stop mode and restarted. (This detection is only performed once when the compressor is on.)
2) If an error continues for 4 times continuously, a permanent stop is made. (Restoration requires resetting the power supply.)
(n) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air conditioning.
The inverter is stopped if any one of the following in item 1), 2) is satisfied. Once the unit is stopped by this function, it is not restarted.
1) When the input current is measured at 1 A or less for 3 continuous minutes or more.
2) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being turned on.
(o) Stop mode (Decision speed is 0 rps, when the protection function for the outdoor controller is operating, when restarting due to operation change)
Functional components
Operation
If stopping due to an indoor unit instruction and if permanent stop.
Cooling Heating
Operation of outdoor unit protection function, if restarting when recovering from thermostat stop and switching operations.
Cooling Heating
Outdoor unit speed
Decision rps
0
Actual operating speed
Outdoor rps
0
Outdoor unit fan
According to outdoor rps
0
4-way valve
ON
OFF
3 min.
3 min.
3 min.
2 min.
55 sec.
3 min.
3 min.
3 min.
2 min.
2 min.
55 sec.
2 min.
E EVA
2 min. 25 sec.
200 pulse
2 min. 25 sec.
200 pulse
2 min. 25 sec.
200 pulse
2 min. 25 sec.
200 pulse
E EVB
EEV control
Fully closed
EEV control
Fully closed
200 pulse 200 pulse 200 pulse 200 pulse
Stop instructions All stop Stop instructions All stop 0 rps instructions Restart Stop instructions Restart
(10) Regulation of outdoor air flow
(a) The fan operates as follows according to the speed of the outdoor unit. (Except during defrost.)
Outdoor unit speed
Fuzzy auto when starting
1st speed
Less than 80
80 or more and less than 100
3rd speed
100 or more and less than 120
4th speed
120 or more
Outdoor fan speed 2nd speed 5th speed
(b) If the outdoor unit fan motor speed is 300 rpm or less for 30 seconds or more continuously, the compressor and outdoor unit fan are stopped.
214
6.5
APPLICATION DATA
SAFETY PRECAUTIONS
¡ Please read these “Safety Precautions” first then accurately execute the installation work.
¡ Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the
WARNING section. However, there is also a possibility of serious consequences in relationship to the points listed in the
CAUTION section as well. In either case, important safety related information is indicated, so by all means, properly observe all that is mentioned.
¡ After completing the installation, along with confirming that no abnormalities were seen from the operation tests, please explain operating methods as well as maintenance methods to the user (customer) of this equipment, based on the owner’s manual.
Moreover, ask the customer to keep this sheet together with the owner’s manual.
WARNING
¡ This system should be applied to places as households, residences and the like. Application to inferior environment such as engineering shop could cause equipment malfunction.
¡ Please entrust installation to either the company which sold you the equipment or to a professional contractor.
Defects from improper installations can be the cause of water leakage, electric shocks and fires.
¡ Execute the installation accurately, based on following the installation manual. Again, improper installations can result in water leakage, electric shocks and fires.
¡ For installation, confirm that the installation site can sufficiently support heavy weight. When strength is insufficient, injury can result from a falling of the unit.
¡ For electrical work, please see that a licensed electrician executes the work while following the safety standards related to electrical equipment, and local regulations as well as the installation instructions, and that only exclusive use circuits are used.
Insufficient power source circuit capacity and defective installment execution can be the cause of electric shocks and fires.
¡ Accurately connect wiring using the proper cable, and insure that the external force of the cable is not conducted to the terminal connection part, through properly securing it improper connection or securing can result in heat generation or fire.
¡ Take care that wiring does not rise upward, and accurately install the lid/service panel. It’s improper installation can also result in heat generation or fire.
¡ When setting up or moving the location of the air conditioner, do not mix air etc. or anything other than the designated refrigerant (R22) within the refrigeration cycle.
Rupture and injury caused by abnormal high pressure can result from such mixing.
¡ Always use accessory parts and authorized parts for installation construction. Using parts not authorized by this company can result in water leakage, electric shock, fire and refrigerant leakage.
¡ Ventilate the work area when refrigerant leaks during the operation.
Coming in contact with fire, refrigerant could generate toxic gas.
¡ Confirm after the foundation construction work that refrigerant does not leak.
If coming in contact with fire of a fan heater, a stove or movable cooking stove, etc., refrigerant leaking in the room could generate toxic gas.
CAUTION
¡ Execute proper grounding. Do not connect the ground wire to a gas pipe, water pipe, lightning rod or a telephone ground wire.
Improper placement of ground wires can result in electric shock.
¡ The installation of an earth leakage breaker is necessary depending on the established location of the unit.
No installing an earth leakage breaker may result in electric shock.
¡ Do not install the unit where there is a concern about leakage of combustible gas.
The rare event of leaked gas collecting around the unit could result in an outbreak of fire.
¡ For the drain pipe, follow the installation manual to insure that it allows proper drainage and thermally insulate it to prevent condensation. Inadequate plumbing can result in water leakage and water damage to interior items.
215
6.5.1
Installation of indoor unit
(a) Caution for installation
1) The system should be applied to places as households, residences and the like.
2) The equipment shall be installed in accordance with national wiring regulations.
3) The connection to the fixed wiring of the mains supply must be made via a double pole isolating switch with a contact gap of at least 3mm in each pole.
4) When the outdoor unit has a possibility of being overturned or being displaced and fall from its original installation position, the outdoor unit should be fixed in its position by the use of anchor bolts or wires.
(b) Installation of indoor unit
1) Fixing of installation Board
¡ Find the inside wall structures (pillar, etc.) and secure the board after checking the horizontal level.
450
¡ Horizontal level adjustment of the board is conducted with four temporarily tightened screws.
Reference hole
¡Adjust so that the board will be horizontal with the reference hole in the center.
Level surface matching mark
Installation space (Indoor unit)
Models SKM22, 25 models
50
75
Service space
Indoor unit
Installation board
Service space
615
150
450 150
100
60
Models SKM28, 32, 40 models
15
50 Service space
170
Unit: mm
Indoor unit
Installation board
Service space
760
450 170
[Front View]
100
15
216
92
40
Gas pipe 370
Liquid pipe 420
67
51
Gas pipe 390
Liquid pipe 440
Drain hose 600
(Connection hole outside diameter ø16)
¡ Drill a hole with a 65 whole core drill.
Position for the hole in the wall ø65
Position for the hole in the wall ø65
2) Drilling of holes and fixture of sleeve (Option ports)
¡The connecting wires may touch the metal inside the wall and cause danger so it is necessary to always use the sleeve.
Sleeve Pipe
Indoor side Outdoor side
Sleeve Inclined plate
5
°
ø65
Position for the hole in the wall ø65
Position for the hole in the wall ø65
Wall thickness
×
1.5cm
Putty
Sealing plate
Assembled state
¡ When the pipe is connected at the rear, cut off the lower and the right side portions of the sleeve collar (as shown by the broken line.)
3) Mounting of interconnecting wires (Field wiring) a) Remove the lid.
b) Remove the terminal block cover.
c) Connect the connection wire securely to the terminal block.
Use cables for interconnection wiring to avoid loosening of the wires.
CENELEC code for cables Required field cables.
H05 RNR4G1.5 (Example)
H Harmonized cable type
05 300/500 volts
R Natural-and/or synth. rubber wire insulation
N Polychloroprene rubber conductors insulation
R Stranded core
4 Number of conductors
G One conductor of the cable is the earth conductor (yellow/green)
1.5 Section of copper wire (mm 2 )
1) Connect the connection wire securely to the terminal block. If the wire is not affixed completely, contact will be poor, and it is dangerous as the terminal block may heat up and catch fire.
2) Take care not to confuse the terminal numbers for indoor and outdoor connections.
3) Affix the connection wire using the wiring clamp.
d) Attach the terminal block cover.
e) Attach the lid.
4) Shaping the pipe and drain hose
[Shaping the pipe] [Taping of the exterior]
Pipe
Lid
Earth terminal
Terminal block
Wiring clamp
Cover
Removed by pressing in the section with the broken lines and pulling it towards the arrow.
Drain hose
¡ Hold the bottom of the pipe and change its direction before stretching it and shaping it.
¡ Tape only the portion that runs through the wall.
Always tape the crossover wires with the pipe.
Cautions when piping from the left and the rear center of the unit
[Top View]
Left Side Piping
Left rear piping
Right Side Piping
Right rear piping
The piping can be removed from the rear, left, left rear, right and from under the unit.
Left side piping
[Procedure for exchanging the drain hose.]
Right side piping
1.Remove the drain hose.
2.Remove the drain cap. 3.Insert the drain cap. 4.Connect the drain hose.
Right
Rear
Under
Left rear
Left
¡ Loosen and remove the spring-type clamp.
¡ Remove with your hand or a pair of pliers.
¡ When conducting the central rear piping, use a nipper to cut out knock-out holes in the installation board.
¡ Use a hexagonal wrench to correctly insert the drain cap which was removed in 2.
C a u t i o n : B e c a r e f u l because if the cap is not inserted property, water leak may occur.
¡ Loosen the spring-type clamp and securely insert the drain hose.
Caution: Be careful because if the cap is not inserted properly, water leak may occur.
Gutter
¡ Do not place the power supply cords above the gutter, because the air conditioner is structured in a way where condensation on the back side is collected in to the drain pan before drainage.
Pipes storage area
Wall
217
Drainage
¡ The drain hose must be fit with a downward slope.
¡ Do not set the drain hose like the following illustrations.
Too high The end of the drain hose is touching the water.
It curves like a wave.
under 5 cm
The gap to the ground is less than 5 cm.
Smell from sewerage drains.
The end of the drain hose is touching the sewage drains.
¡ Pour water in the drain pan below the heat exchanger and confirm that the water is drained outside.
¡ If the extension drain hose is indoors, make sure it is insulated using a shielding pipe (not supplied).
Shielding pipe
Drain hose
Extension drain hose when a part of the extension drain hose is indoors
5) Securing the Indoor Unit to the Installation Board
Indoor unit
Installation board
Hook (2 locations)
Installing steps
1. Hook the upper part of the indoor unit to the installation board.
Instalation board
Wall
Indoor unit base lower hook
6.5.2
Installation of remote controller
(1) Mounting method of battery
Uncover the remote control switch, and mount the batteries (UM-4
×
2 pieces) in the body regularly.
(2) Fixing to pillar or wall
(a) Conventionally, operate the remote control switch by holding in your hand.
(b) In the case of stationary operation service as by mounting on the holder for the remote control switch, make sure that the locating place is satisfactory for access service before installing it.
(c) Avoid installing it on a clay wall etc.
218
2. The unit can be installed simply by gently pushing in the lower part.
Battery
Cover
Wood screw
ø3.5
×
16
Holder (remote control switch)
Adjust the installation to vertical attitude.
Avoid projecting the screw head.
6.5.3
Installation of outdoor unit
(1) Selection of installation location
(Please install with the customer’s consent in a location that follows the conditions listed below.)
(a) Where the following installation space is available, and where air does not gather.
(b) Where rain and sunlight do not directly hit the unit, and where there is enough air circulation.
(c) Also, where the unit cannot be buried by snow.
A location which can sustain the weight of the unit, and where noises and vibrations are not enhanced.
(d) Where blasts of cold or hot air and noise do not bother the neighbors.
(e) Where the unit does not receive heat radiation from other heat sources.
(f) Where there are no obstructions (animals, plants, etc.) to the suction inlet and blowing outlet.
(g) Where water may drain out.
(h) Please avoid the following locations.
1) Where there is constant exposure to harsh winds such as the top floors of a building. Also, locations with exposure to salty air.
2) Where there are oil splashes, vapor, and smoke.
3) Where there are possibilities of flammable gas leaks.
(i) Installation space (on a flat surface)
Air inlet
If there are no open space to install the unit, and it must be installed in a location where there are obstructions such as a wall to the suction inlet and the blowing outlet, please observe the following points. In such cases, please also be aware
Air
Outlet
300
( Service space
) that the performance of the cooling/heating system may decline by approximately 10%.
Note (1) If the wall is higher than 1.2 m or a ceiling is present, distances larger than indicated in the above table must be provided.
Air inlet 80 mm or more
Air
Outlet
180 mm or more
75 mm or more Air inlet 80 mm or more
Air inlet
Air
Outlet
280 mm or more
Air inlet 80 mm or more
250mm or more
Air
Outlet
280 mm or more
(2) Installation of outdoor unit
(a) Make sure that sufficient space for installation and service is secured.
(b) Fix the leg sections of the unit on a firm base which will not play.
Attach cushion pads, etc. between the unit and the mounting fixtures not to transmit vibration to the building.
(c) Attach a drain elbow, etc. under the drain port of the bottom plate to guide drain water.
(Drain elbow should not be used where days when temperature drops below 0
°
C continue for several days. Draining may be disturbed by frozen water.)
(d) When installing the unit at a higher place or where it could be toppled with strong winds, secure the unit firmly with foundation bolts, wire, etc.
219
6.5.4
Electrical wiring
Circuit breaker
Earth leakage
UNIT A
1 2 3
UNIT B
1 2 3 Out side
1 2 3 1 2 3
UNIT A UNIT B
In side
(1) Connection of the power lines
(a) This multi-type room air conditioner receives its power from outside.
(b) It is necessary to use a single phase 200/240 V 50 Hz for the power supply.
(c) An earth leakage breaker and a circuit breaker must be installed.
Their capacities are listed below.
(d) Use the power supply wires specified below. Different wires may cause heat generation and fire. Do not to use unspecified wires.
Never bundle, wind or treat the power wires. Otherwise, heat or fire may be generated.
SCM45ZA
SCM45YA
25A
25A
Use cables for interconnection wiring to avoid loosening of the wires.
CENELEC code for cables Required field cables.
H05 RNR3G4.0 (Example)
H Harmonized cable type
05 300/500 volts
R Natural-and/or synth. rubber wire insulation
N Polychloroprene rubber conductors insulation
R Stranded core
3 Number of conductors
G One conductor of the cable is the earth conductor (yellow/green)
4.0
Section of copper wire (mm 2 )
[POWER SUPPLY CODE]
CENELEC code for cables required field cables.
H05RNR3G 4.0
(e) After connecting the power supply wires, make sure to secure the wires with wiring clamps.
(2) Connecting the outside/inside crossover wires
(a) Ensure that crossover wiring is matched with crossover piping in A and B rooms.
(b) The length of the crossover wires should be under 25 m. If it longer than 25 m, signal errors between the units may occur and cause the operation to shut down.
(c) Use the crossover wires specified below. Different wires may cause heat generation and fire. Do not to use unspecified wires.
[INTERCONNECTING WIRING CODE]
CENELEC code for cables required field cables.
H05RNR4G 1.5
(d) Make sure the terminal numbers on the terminal board of the indoor and outdoor connections are correct.
(e) After connecting the crossover wires to the terminal board, use wiring clamps to secure the wiring.
220
6.5.5
Refrigerant Piping
(1) Limit
The maximum permissible length of the refrigerant pipes for the outdoor units, and the maximum permissible height difference for the outdoor units are as shown below.
Length for one indoor unit
Total length for all rooms
Lower installation spot of the indoor unit A
Height difference
Upper installation spot of the indoor unit B
Maximum height difference of the indoor units C
Length of chargeless refrigerant pipe *
Under 25m
Under 30m
Under 15m
Under 10m
Under 25m
20m
* If the total length for all the rooms exceeds the length of chargeless refrigerant pipe, additionally charge with refrigerant according the item 4.
A
B
¡ The diameter of the refrigerant pipe:
Class of indoor unit (kW)
Diameter of joint pipe
Liquid side
Gas side
2.2 · 2.5 · 2.8kW
ø 9.52 · t 0.8
ø 6.35 · t 0.8
3.2 · 4.0kW
ø 12.7 · t 0.8
¡ Outdoor unit and the total connectable indoor units (class kW):
Model
SCM45ZA
SCM45YA
Total of indoor units (class kW)
6.5kW
6.5kW
C
(2) Connection of refrigerant piping
¡ The service valve corresponding to each indoor unit is as illustrated in the right figure.
¡ Changing the gas side piping size
If the piping connection for the gas side of the outdoor unit does not match the piping size of the indoor unit, use the parts provided for variable connections to make the joint.
Variable diameter joint (provided): ø9.52
→
ø12.7 (1 piece)
[Examples of use of variable diameter joints]
Connection of indoor unit of Class 4.0 to A unit.
Service valve for room B
Service valve for room A
Liquid
Liquid side service valve
Liquid side service valve (ø6.35)
Service valve for room A
Gas side service valve (ø9.52) Copper packing
ø6.35 pipe
4.0 kW class
Indoor unit
ø12.7 pipe
Variable diameter joint (ø9.52–ø12.7)
Gas
Gas side service valve
¡ Securely fit the copper packing between the service valve and the variable diameter joint to prevent shifting.
¡ Cover the pipes with tape so that dust and sand do not enter the pipe until they are connected.
[Connection of pipes]
¡ When connecting the pipes to the outdoor unit, be careful about the discharge of fluorocarbon gas or oil.
¡ Make sure to match the pipes between the indoor unit and the outdoor unit with the correct service valves.
(1) Preparations
Indoor
Push
Remove
¡ Remove the flare nut (from both liquid and gas sides).
Outdoor
Push
Remove
¡ Remove the flare nut (from both liquid and gas sides).
A
A dimensions
Liquid side:
ø 6.35: ø 9 ~ ø 9.5
Gas side:
ø 9.52: ø 13.2 ~ ø 14
ø 12.7: ø 16.2 ~ ø 17
¡Fit the removed flare nut to the joint pipe, and then flare it.
ø9.52
ø9.52
221
(2) Connection
Indoor
Liquid side
Gas side
Outdoor
Liquid side
Gas side
¡ Secure the nut with a specified tightening torque to avoid any gas leaks.
¡ Secure the nut with a specified tightening torque to avoid any gas leaks.
¡ When air purging with a vacuum pump, secure the nut with a specified tightening torque to avoid any gas leaks.
¡ When air purging with a refrigerant from an outdoor unit, just temporarily secure the nut.
¡ Specified tightening torques are as follows:
Liquid side (ø 6.35): 17mm in width across flat of the flare nut: 15.7-19.6 N·m (1.6-2.0 kgf·m)
Gas side (ø 9.52): 22mm in width across flat of the flare nut: 29.4-39.2 N·m (3.0-4.0 kgf·m)
Gas side (ø 12.7): 24mm in width across flat of the flare nut: 39.2-49.0 N·m (4.0-5.0 kgf·m)
(3) Air purging
To protect the global environment, use a vacuum pump that do not release flourocarbon gas into the atmosphere.
When a vacuum pump cannot be used due to certain conditions for installation, sufficient refrigerant is available for air purging with refrigerant for the outdoor unit.
Note: Fully open the service valves (on both liquid and gas sides) after completing air purging
(a) Remove the cap on both gas and liquid sides before starting operation.
(b) After completing the operation, do not forget to tighten the cap (gas may leak).
(c) Conduct air purging for all connected indoor units.
Procedure
1 Secure all flare nuts on both indoor and outdoor sides to prevent leaks from the pipes.
2 Connect the service valves, charge hose, manifold valve and vacuum pump as shown in the right figure.
3 Fully open the handle Lo for the manifold valve, and pump a vacuum for 15 minutes. Ensure that the meter is indicating -0.1 MPa (-76cmHg).
4 After vacuuming, fully open the service valve (both liquid and gas sides) with a hexagon wrench.
5 Ensure that there are no gas leaks from the joints in the indoor and outdoor units.
6 Repeat the above steps 1 ~ 5 for all connected indoor units.
Compound pressure gauge
-0.1 MPa
(-76cmHg)
Pressure gauge
Manifold valve
Handle Hi
Handle Lo
Charge hose
Charge hose
Open
Vacuum pump
Open
(4) Additional refrigerant charge
(a) When the total refrigerant pipe length for all the rooms exceeds the length of the uncharged pipe (20m), additional refrigerant is required.
(If 20m or less, additional charge is not required.)
(b) For this multi type room air conditioner, it is not necessary to charge the refrigerant for the total maximum length in all the rooms.
Model
Charged pipe length
(Amount of uncharged refrigerant) *1
On site additional charge
Maximum total pipe length for all rooms
(Maximum amount of refrigerant)
SCM45ZA
SCM45YA
1300g 20g/m
*1: Charge amount at the time of shipment.
(c) Ensure that there are no gas leaks from the pipe joints by using a leak detector or soap water.
222
1500g
(5) Heat insulation for joint
Heat insulation for joints
Vinyl tape
Cover the joint with insulation material for the indoor unit and tape it.
Position so the slit comes on top.
Finish and fixing
Pipe clamp
Pipes
Crossover wires
Exterior tape
Drain hose
Tapping screw
Apply exterior tape and shape along the place where the pipes will be routed. Secure to the wall with a pipe clamp. Be careful not to damage the pipes and the wires.
6.5.6
Test run and handling instruction
(1) Inspection
Check according to the following check items.
(2) Test run
(a) Carry out the test run for each unit individually. (If 2 units are tested at the same time, wrong wiring and wrong pipe connections cannot be checked.)
(b) After each individual test, run the units in all the rooms simultaneously and check the units.
(c) Test both the cooling and the heating.
(Three-minute restart preventive timer)
When the air conditioner is restarted or when changing the operation, the unit will not start operating for approximately 3 minutes. This is to protect the unit and it is not a malfunction.
Installation test check points
Check the following points again after completion of the installation, and before turning on the power. Conduct a test run again and ensure that the unit operates properly. At the same time, explain to the customer how to use the unit and how to take care of the unit following the instruction manual.
After installation
The power supply voltage is correct as the rating.
No gas leaks from the joints of the service valve.
Power cables and crossover wires are securely inserted and fixed to the terminal board.
Each indoor and outdoor unit is properly connected (no wrong wiring or piping).
Service valve is fully open.
Refrigerant has been additionally charged (when the total pipe length exceeds the refrigerant charged pipe length).
The pipe joints for indoor and outdoor pipes have been insulated.
Earthing work has been conducted properly.
Test run
Air conditioning and heating are normal.
No abnormal noise.
Water drains smoothly.
Protective functions are not working.
Operation of the unit has been explained to the customer.
Beware of wrong connections in refrigerant piping and wiring
¡ Make sure to match the piping and wiring from each unit to the outdoor unit.
¡ Be careful because if connections are wrong, normal operation cannot be achieved and may damage the compressor.
[Correct connections] [Example of wrong connections]
Piping
Wiring
Indoor unit
Indoor unit
A unit
B unit
A
Outdoor unit
B
A unit
B unit
A
Outdoor unit
B
223
6.6
MAINTENANCE DATA
6.6.1
Trouble shooting
(1) Trouble shooting to be performed prior to exchanging PCB, (Printed circuit board) [Common to all models]
All the models described in this chapter are controlled by a microcomputer. When providing maintenance service to customers it is necessary to understand the function controlled by a micro computer thoroughly, so as not to mistakenly identify correct operations as mis-operations. It is also necessary to perform the following simple checks before conducting detailed checks or exchanging printed circuit board.
Before exchanging Printed circuit board
Claim call from the user
Ascertain the nature of the claim.
Ascertain the operation status.
YES
Is this nonsense claim?
NO
Operate the unit.
Does the trouble occur again?
YES
Temporarily turn off the power source and turn it on again in about 1 min. and turn the unit on again.
NO
Does the trouble occur again?
YES
Disconnect connectors and connect them again.
Operate the unit again after confirming that the fuse and the varistor equipped on PCB does not burn out.
NO
Unit did not cool, etc.
¡ Is the power on?
¡ Is the thermostat setting correct?
(Not too high?)
¡ Is the unit in a time operation?
¡ Does user understand function?
etc.
¡ Explain the function of the unit to user.
No need for PCB change
Check further the status when the trouble Occurred
(such as the timer of occurrence, power failures, thunder, use status of other electrical appliances, etc.).
Clarify the reason for the problem and explain it thoroughly to the user.
No need for PCB change
Microcomputer runaway due to power source conditions is a possible cause.
NO No need for PCB change
The cause is defective connector contact.
Does the trouble occur again?
YES
Carry out checks according to detailed check process (See later page)
224
(2) Indication of self diagnosis
Indoor unit indicator
RUN lamp TIMER lamp
Outdoor unit indicator
(LED 2)
Description of trouble
Cause Conditions of flashing
1 time flash
2 time flash
6 time flash
Keeps flashing
Keeps flashing
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
1 time flash
2 time flash
Stays off
Stays off
Stays off
Stays off
Stays off
Indoor heat exchanger thermistor error
• Broken heat exchanger thermistor wire
• Connector poor connection
When heat exchanger thermistor temperature of
–20
°
C or under continued for more than 3 seconds while operation is stopped. (This is not displayed during operation.)
Room temperature thermistor error
Indoor fan motor error
Outdoor temperature thermistor error
• Broken room temperature
• thermistor wire
Connector poor connection
• Defective fan motor
• Connector poor connection
•
•
Broken outdoor thermistor wire
Poor connector connection
Outdoor heat exchanger thermistor error
• Broken heat exchanger thermistor wire
• Poor connector connection
When room temperature thermistor temperature of –20
°
C or under continued for more than 3 seconds while operation is stopped. (This is not displayed during operation.)
When air conditioner is operating and indoor fan motor is turned ON, indoor fan motor speed of
400 rpm or under continued for more than 30 seconds. (Air conditioner stops.)
When outdoor temperature thermistor temperature of –40
°
C or under continued for more than 3 seconds while operation is stopped. (This is not displayed during operation.)
When heat exchanger entrance thermistor temperature of –50
°
C or under continued for more than
3 seconds while operation is stopped. (This is not displayed during operation.)
1 time flash
2 time flash
2 time flash
1 time flash
2 time flash
Trouble of outdoor unit
Current cut
On for 4 seconds and off
Comp. dome thermistor error for 4 seconds
•
•
• Compressor locking
•
•
Open phase on compressor output
Shortcircuit on power transformer
When converter output current which exceeds setting value is detected. (Compressor stops.)
•
•
•
Defective power transistor.
Broken compressor wire
Compressor blockage
Broken comp. dome thermistor wire
Connector poor connection
When an error with the outdoor unit causes an error stop, or when the input current is measured at 1 A or less for 3 continuous minutes or more.
(Compressor is stopped.)
After the outdoor unit speed has been 0 rps or more for 10 continuous minutes and the compressor dome thermistor has sent a 10 second or more broken wire signal (less than 7
°
C). (Compressor is stopped.)
Comes on 3 time flash 3 time flash Current safe stop
•
•
Overload operation
Overcharge
When the actual speed is 28 rps or less and the current save has operated. (Compressor stops)
Comes on
Comes on
Comes on
5 time flash
6 time flash
2 time flash
5 time flash Over heat of compressor
•
•
Gas shortage
Defective comp. dome thermistor
When comp. dome thermistor value exceeds setting value.
(Compressor Stops.)
6 time flash
Error of signal transmission
•
•
•
Defective power supply
Broken signal wire
If serial signal cannot be sent or received for 1
Defective indoor/outdoor unit minute and 55 seconds continuously.
circuit boads.
7 time flash Compressor lock
•
•
Defective compressor
Defective outdoor PCB
When the motor for the compressor does not turn a half a turn approximately 0.3 seconds after it has been started.
Comes on 2 time flash Comes on
Outdoor fan motor error
•
•
Defective fan motor
Connector poor connection
When the outdoor unit fan motor operates at 300 rpm or less for 30 seconds or more continuously.
225
(3) Inspection procedures corresponding to detail of trouble
Thermistor error
Is connector connection good?
YES
Is thermistor resistance value good?
YES
Replace PCB.
NO
Correct connection.
NO
Replace thermistor.
[Broken thermistor wire, connector poor connection]
◆ Comp. dome thermistor temperature characteristics
55
60
65
35
40
45
50
Temperature (˚C) Resistance (k
Ω
) Temperature (˚C) Resistance (k
Ω
)
0 164 70 8.7
5
10
127
99
75
80
7.3
6.2
15
20
25
30
78
62
50
40
85
90
95
100
5.3
4.5
3.9
3.3
32
26
21
17
14
12
10
105
110
115
120
125
130
135
2.9
2.5
2.2
1.9
1.6
1.4
1.3
◆ Thermistor temperature characteristics
(Room temp., indoor and outdoor unit heat exchanger temp., outdoor temp.)
30
(Broken wire)
25
20
15
Resistance (k
Ω
)
10
5
(Shortcircuit)
–10 0 10 20 30 40 50 60 70
Temperature (˚C)
Current cut
Does current cut operate when operating inverter with compressor wire disconnected?
YES
Is output voltage applied to all 3 phases of power transistor?
YES
Is there any shortcircuit?
YES
Inspect compressor.
NO
NO
NO
Defective inverter
Defective inverter
Secure space for inlet and outlet.
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 M Ω
or over)
¡ Check coil wire resistance. (Few Ω
)
[Open phase on compressor output terminal, compressor lock]
If check results are normal, compressor is locked.
226
Outdoor unit e rror
Is output voltage applied to all 3 phases of power transistor?
YES
Is compressor wiring connected securely?
YES
Inspect compressor. (Broken coil wire)
NO
NO
Defective inverter
Connect securely.
[Broken power transistor, broken compressor wire]
Current safe stop
Is refrigerant charge quantity adequate?
YES
Is outdoor ventilation condition good?
YES
Inspect compressor.
YES
Defective inverter
NO
NO
[Overload operation, compressor lock, overcharge]
Discharge refrigerant.
Secure space for inlet and outlet.
Compressor overheat
Is comp. dome thermistor resistance value good?
YES
Is sufficient quantity of refrigerant circulated?
YES
Defective inverter
NO
[Gas shortage, defective comp. dome thermistor]
Connector connection check, resistance value check, replacement of comp. dome thermistor
NO Does trouble persist after charging gas?
YES
Clogged capillary tube, etc.
NO
Gas shortage
[Defective fan motor, defective indoor PCB]
Indoor fan motor error
Is connector connection good?
YES
Is voltage applied to fan motor?
(Between White - Red)
YES
Defective fan motor
NO
Correct connector connection.
NO
Defective indoor unit
PCB
227
228
Outdoor fan motor error
Is connector connection good?
YES
Is voltage applied to fan motor?
(DC)
YES
Defective fan motor
NO
Correct connector connection.
NO
Defective outdoor unit
PCB
[Defective fan motor, defective outdoor PCB]
Serial signal transmission abnormality
Is this a recurring error when resetting power supply?
YES
(1)
Is the wiring connection between the indoor and outdoor unit improperly wired?
YES
NO
NO
This is due to a temporary cause (interference, etc.) and is not a failure of the unit.
[Indoor/outdoor printed circuit board defect
Outdoor power source abnormality]
Possible causes include interference from the lighting, spontaneous load interference, power supply interference and radial interference.
Correct indoor and outdoor unit connections.
Does the voltage between terminals 2 and 3 on the indoor unit oscillate between approximately DC 0 and 12 volts?
YES
NO
Does the voltage between terminals 2 and 3 on the outdoor unit oscillate between approximately DC 0 and 12 volts?
YES
NO
Is AC 220/240 V measured between terminals 1 and 2 on the outdoor unit?
YES
NO
Is the electrical system operating properly (fuse, reactor, etc.)?
YES
NO
Defective outdoor circuit board
Defective indoor unit circuit board.
Inspect interconnection wire.
Defective indoor unit circuit board. Inspect interconnection wire.
Replace fuse and reactor.
Compressor lock
[Defective compressor, defective outdoor PCB]
Is output voltage applied to all 3 phases of power transistor?
YES
Inspect compressor.
NO
Defective inverter
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 M Ω
or over)
¡ Check coil wire resistance. (Few Ω
)
If check results are normal, compressor is locked.
(4) Phenomenon observed after shortcircuit, wire breakage on thermistors.
(a) Indoor unit
Thermistor
Room temperature thermistor
Heat exchanger thermistor
Operation mode
Cooling
Heating
Cooling
Heating
Shortcircuit
Release of continuous compressor operation command
Phenomenon
Continuous compressor operation command is not released.
Broken wire
Continuous compressor operation command is not released.
Release of continuous compressor operation command
System can be operated normally.
Continuous compressor operation command is not released.
(Anti-frosting)
High pressure control mode (Inverter stop command) Hot keep (Indoor fan stop)
(b) Outdoor unit
Thermistor
Heat exchanger thermistor
Outdoor temperature thermistor
Comp. dome thermistor
Operation mode
Cooling
Heating
Cooling
Heating
All modes
Shortcircuit
Defrosting is not performed.
Defrosting is not operated.
Compressor overload protection is disabled.
(Can be operated.)
Phenomenon
Broken wire
System can be operated normally.
Defrosting is performed for 10 minutes at approx. 1 hour.
System can be operated normally.
Defrosting is performed for 10 minutes at intervals of approx. 30 minutes.
Compressor stop (There is no inverter output.)
(5) How to make sure of remote controller
Is remote controller normal?
(1)
NO Remote controller defects
YES
Again pushing operating switch
Note (1) Check method of remote controller
(a) Press the reset switch of the remote controller.
(b) If all LCD are displayed after zero (0) display, it is basically normal.
Heat Pump model
Operating the unit?
YES
Abnormality is not found.
NO
Does backup switch operates?
Cooling only model
Operating the unit.
NO
Control problem on main unit
YES
Replace the display.
Is the unit operable with remote controller?
YES
NO
Defective remote controller
Normal
229
(6) Indoor electrical components inspection flowchart
Is there voltage between terminal blocks 1 and 2 ? (AC 220/240 V)
NO
YES
NO
Is the fuse burnt out? (3.15 A)
YES
Inspect power source for outdoor unit.
Replace fuse.
Is there voltage between CNC (1) and (2) on the secondary side of the transformer? (Approx. 12 V)
YES
NO
Is the voltage between terminal blocks 2 and 3 oscillating between
DC 0 and 12V?
YES
NO
Indoor electrical components are normal.
Replace the transformer.
Replace printed circuit board.
230
(7) Outdoor unit inspection points
CAUTION – HIGH VOLTAGE
High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the unit is stopped.
¡ Power source and serial signal inspection
1 to 2: AC220/240V
2 to 3: Normal if the voltage oscillates between DC 0 and approx. 12V
¡ Display lamp inspection
• LED 2 (Abnormality display lamp - Red)
• LED 1, 3 (Light display for each room -
Green)
ON or flashing: Protection function operating
ON when there is a serial signal being received among each of the indoor units.
OFF during ignition, stop abnormality.
◆ Inspection of reactor conductivity
Remove the connector and check for conductivity.It must be conductive.
L
Power source
1 Phase
220/240V
50Hz
UNIT A
UNIT B
1
2
3
1
2
3
BK
WH
RD
BK
WH
BL
Serial A
52X2-4
BL
Serial B
S. OUT
GY
R. IN
S. IN
Fuse
250V 25A
1
2
BK
WH
Y/GN
Y/GN
G
CNB
Printed circuit board
CNA
AC·R
~
AC·S
+
~
DS
–
CNB
CNE
WH
LED1 LED3 LED2
(Green) (Red)
CNF
OR
IC2
+ + + +
Power transistor
Printed circuit board
CNA CND
P
N
U RD
V WH
W BK
CNC
CM
20S EEVA EEVB FMo
Tho-A Tho-R Tho-D
¡ Inspection of electronic expansion valve
To test if there is voltage.
(Voltage is only applied to the electronic expansion valve when the valve angle is being changed.)
Red to white
Red to Orange
Brown to yellow
Brown to blue
}
Normal if there is approximately DC 5 V 10 seconds after the power supply is turned on.
If the expansion valve does not operate as shown above, it is defective.
◆ Inspection of resistance value of Comp. dome
thermistor
Remove the connector and check the resistance value.
See the section of thermistor characteristics on page 226.
◆ Power transistor inspection procedure
[Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)]
(1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.). If no problems are found, check the output of the power transistor.
(2) Output inspection procedure
Disconnect the terminals for the compressor. If an output such as the one shown in the figure on the right can be measured, the power transistor and the circuit board for the outdoor unit are normal.
Output voltage
(ACV)
(Example)
Self-diagnosis display : Flashes 2 times
0 For about 50 seconds. After being switched on, there will be a delay of approximately one minute depending on the conditions.
8 ~ 10 sec.
1
Operation SW ON
Measure in this section
231
6.6.2
Servicing
(1) Evacuation
The evacuation is an procedure to purge impurities ...... noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R22 is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze, causing what is called water clogging.
¡ Evacuation procedure
(a) Check to ensure that there is no internal pressure in the unit. If there is an internal pressure, it should be relieved through the check joint.
(b) Connect the service hoses of the gauge manifold to the check joint of the gas & liquid piping.
(c) Connect a vacuum pump to the charge hose A . Repeat evacuation in the following sequence.
Liquid side
Start the vacuum pump.
Compound pressure gauge indicates –0.1 MPa (–76 cmHg)
Gas side
Operate the vacuum pump for more than 15 minutes after –0.1 MPa
( –76 cmHg) is indicated.
Check joint
Close low pressure valve 1 of gauge manifold.
Service hose
Stop the vacuum pump.
Gauge manifold
Charge hose
Refrigerant cylinder
Notes (1) Do not use the refrigerant pressure to expel air.
(2) Do not use the compressor for evacuation.
(3) Do not operate the compressor in the vacuum condition.
Vacuum pump
(2) Refrigerant charge
(a) Discharge refrigerant entirely from the unit and evacuate the unit.
Note: Addition of refrigerant without evacuation is unreasonable, because it will result in low charge or overcharge.
(b) Keep the gauge manifold and connect a refrigerant cylinder to the unit.
(c) Record the weight of the refrigerant cylinder on the balance. This is necessary for making sure of the charged refrigerant amount.
(d) Purge air from the charge hose A
Firstly loose the connecting portion of the charge hose A at the gauge manihold side and open the valve 3 for a few seconds, and then immediately retighten it after observing that gas is blow out from the loosened portion.
(e) Open the valve 1 and 3 after discharging air from the charge hose A , then the gas refrigerant begins flowing from the cylinder into the unit. Be sure to erect the refrigerant cylinder upright to let gas refrigerant flow into the unit.
(f) When refrigerant has been charged into the system to some extent, refrigerant flow becomes stagnant, when that happens, start the compressor in cooling cycle until the unit is filled with gas to the specified weight.
(g) Making sure of the refrigerant amount, close the valve 3.
(h) Disconnect the charge hose from the unit. Cover the valve ports of the refrigerant piping with caps and tighten them securely.
(i) Check for gas leakage applying a gas leak detector along the piping line.
(j) Start the air conditioner and make sure of its operating condition ...... high side and low side pressures and temperature difference between suction air and outlet air.
232
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