Mitsubishi Heavy Industries SRK28HD User manual

WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Air to air heat pump type)
R22 use models
SRK28HD
SRK40HD
TECHNICAL MANUAL
& PARTS LIST
DRAFT

INDOOR UNIT
Models SRK28HD, SRK40HD
OUTDOOR UNIT
Model SRC28HD
REMOTE CONTROLLER
Model SRC40HD

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1
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Serial signal transmission error
1 GENERAL INFORMATION
1.1 Specific features
The “Mitsubishi Daiya” room air-conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and
outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment with opera-
tion control switch and the outdoor unit is composed of condensing unit with compressor.
(1) Remote control flap
The flap can be automatically controlled by operating wireless remote controller.
¡Air scroll: Flap operation is automatically control.
¡Swing: This will swing the flap up and down.
¡Memory flap: Once the flap position is set, the unit memorizes the position and continues to operate at the same position from
the next time.
(2) Automatic Operation
When the remote control switch is set on “auto( )”, it will either automatically decide operation mode such as cooling, heating
and thermal dry, or operate in the operation mode before it has been turned to automatic control.
(3) Self diagnosis function
¡We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as
follows.
Series No.
Heat pump type
Product capacity
Wall mounted type
Split type room air-conditioner
1.2 How to read the model name
Example : SR K 40 H D
Room temperature thermistor error
Indoor fan motor error
Heat exchanger thermistor error
2 time flash
6 time flash
TIMER lamp
ON
1 time flash
Outdoor unit heat exchanger
thermistor error
Discharge pipe thermistor error
Outdoor temperature thermistor
error
2 time flash
4 time flash
RUN lamp
keeps flashing
1 time flash
OFF
OFF
OFF
Outdoor unit error
Compressor overheat
Current cut
2 time flash
5 time flash
RUN lamp
ON
1 time flash
2 time flash
5 time flash
1 time flash
6 time flash 6 time flash
RUN lamp TIMER lamp Outdoor (LED)

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Item Model SRK28HD SRC28HD
Cooling capacity(1) W
Heating capacity(1) W
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW
Running current (Cooling) A
Heating input kW
Running current (Heating) A
Inrush current A
COP Cooling sound level
Noise level Power level dB (55) (60)
Heating sound level
Power level (56) (60)
Exterior dimensions
Height ×Width ×Depth mm 250 ×815 ×249 540 ×720 ×290
Color Cool white Stucco white
Net weight kg 9.0 32
Refrigerant equipment
Compressor type & Q’ty –2PS164D5BF02 (Rotary type) ×1
Motor kW –0.75
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 0.8 (Pre-Charged up to the piping length of 7.5m)
Refrigerant oil R0.35 (SUNISO 4GDID or ATMOS M60)
Deice control MC control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 15
(Cooling) 8.0 30
Air flow (at High) (Heating) CMM 8.5 30
Air filter, Q’ty Polypropylene net (washable) ×2–
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote controller –
Room temperature control MC. Thermostat –
Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)
Safety equipment
O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ9.52 (3/8″)
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4 m
Gas line : 0.33 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2.5 m (3 cores with Earth)
Size ×Core number 1.5 mm2×4 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit
Optional parts –
Notes (1) The data are measured at the following conditions.
2 SELECTION DATA
2.1 Specifications
Model SRK28HD (Indoor unit)
SRC28HD (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
(2) The operation data are applied to the 220/230/240V districts respectively.
(3) The refrigerant quantity to be charged includes the refrigerant in 7.5 m connecting piping.
If the piping length is longer, when it is less than 10 m, add 20 g refrigerant per meter and when it is 10 to 15 m, add 30 g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
Frost protection, Serial signal error protection
Fan motor error protection
The piping length is 7.5m.
Compressor overheat protection, Overcurrent pro-
tection, Serial signal error protection

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Item Model SRK40HD SRC40HD
Cooling capacity(1) W
Heating capacity(1) W
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW
Running current (Cooling) A
Heating input kW
Running current (Heating) A
Inrush current A
COP Cooling sound level
Noise level Power level dB (56) (63)
Heating sound level
Power level (57) (64)
Exterior dimensions
Height ×Width ×Depth mm 250 ×815 ×249 640 ×850 ×290
Color Cool white Stucco white
Net weight kg 9.0 41
Refrigerant equipment
Compressor type & Q’ty –(RM5517GNE4)
Motor kW –1.3
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 (Pre-Charged up to the piping length of 7.5m)
Refrigerant oil R0.6 (BARREL FREEZE 32SAM)
Deice control MC control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 35
(Cooling) 9.0 38
Air flow (at High) (Heating) CMM 9.5 38
Air filter, Q’ty Polypropylene net (washable) × 2 –
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote controller –
Room temperature control MC. Thermostat –
Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)
Safety equipment
O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ12.7 (1/2″)
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4 m
Gas line : 0.33 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2.5 m (3 cores with Earth)
Size ×Core number 1.5 mm2×4 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit
Optional parts –
Notes (1) The data are measured at the following conditions.
Model SRK40HD (Indoor unit)
SRC40HD (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
(2) The operation data are applied to the 220/230/240V districts respectively.
(3) The refrigerant quantity to be charged includes the refrigerant in 7.5 m connecting piping.
If the piping length is longer, when it is less than 10 m, add 20 g refrigerant per meter and when it is 10 to 15 m, add 30 g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
The piping length is 7.5m.
Frost protection, Serial signal error protection
Fan motor error protection Compressor overheat protection, Overcurrent pro- tection, Serial signal error protection

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2.2 Range of usage & limitations
2.3 Exterior dimensions
(1) Indoor unit
Models SRK28HD, 40HD
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length Max. 15m
All models
Refer to the selection chart
Power source voltage Rating ±10%
Voltage at starting Min. 85% of rating
Frequency of ON-OFF cycle Max. 10 times/h
ON and OFF interval Max. 3 minutes
Outdoor air temperature
(Upper, lower limits)
Vertical height difference between
outdoor unit and indoor unit Max. 5m (Outdoor unit is higher) Max. 5m (Outdoor unit is lower)
Item
Models
Unit: mm
117.5 580 117.5
148.5
216.5216.5
8.2
44.5
236.1
5.7
450
450
67.5
42.7 47.2
175
44.5
216.5216.5
148.5
53.5
Piping for Gas
Drain hose 540 (ø16)
Piping for Liquid 465.1 (ø6.35)
Piping hole (ø65) Piping hole (ø65)
( )
28:ø9.52
40:ø12.7 397.1
815
250
A
45
14.5
60
788
560
45
VIEW A
Piping hole right(left)
Terminal block
960
45
3
249

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(2) Outdoor unit
Model SRC28HD
Drain hole
286.4
12
50
290
49.6 43.5
850
203.1 510 136.9
476
Elogated hole
(2-12x16)
314 12
328
Terminal block
Service valve (Liquide)
ø6.35 (1/4'')
Service valve (Gas)
ø12.7 (1/2'')
Ground
terminal
124 34.6
20˚
20˚
42.7
100.3
15
640
14
Model SRC40HD
Unit: mm
290
540
14.4 47.4 42.6
264.5
71
404.5
510
720
17.8
Drain holes
50 12
39.7
99.9
340
312.5 13.5
14
139 2-16x12
61.9
139.3 33.3 Flare connecting ø6.35 (1/4")
Service valve (Liquid)
40˚
40˚
Flare connecting ø9.52 (3/8")
Service valve (Gas)
Terminal block

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2.4 Piping system
Model SRK40HD
Outdoor unitIndoor unit
Flare connecting
Room temp.
thermistor
Heat
exchanger
Flare connecting
Piping
(Liquid)
ø6.35
Heat
exchanger
thermistor
Piping
(Gas)
ø9.52
Service valve
(Gas)
Check joint
4 way valve
Service valve (Liquid)
Strainer
Capillary tube Capillary tubeCapillary tube
Compressor
Accumulator
Discharge temp.
thermistor
Heat exchanger
thermistor
Heat
exchanger
Outdoor air
temp. thermistor
Cooling cycle
Heating cycle
Model SRK28HD
Outdoor unitIndoor unit
Flare connecting
Room temp.
thermistor
Heat
exchanger
Flare connecting
Piping
(Liquid)
ø6.35
Heat
exchanger
thermistor
Piping
(Gas)
ø12.7
Service valve
(Gas)
Check joint
4 way valve
Service valve (Liquid)
Strainer
Capillary tube
Compressor
Accumulator
Discharge temp.
thermistor
Heat exchanger
thermistor
Heat
exchanger
Outdoor air
temp. thermistor
Cooling cycle
Heating cycle
Check valve

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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
(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.
(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.
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SRK40HD with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C
and outdoor dry-bulb temperature 35˚C is Net cooling capacity = 3600 ✕0.975 ✕1.0 =3510 w
SRK40HD Length 15m Factor by air
temperatures
15
ISO-T1 Standard ConditionOutdoor air W.B. temperature °C W.B.
010-10 -5 5
14 16 18 20 22
15
10
27
25
20
15
20
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
24
20
ISO-T1 Standard ConditionIndoor air W.B. temperature °C W.B.
Heating
Cooling
Applicable range
Coefficient of cooling & Heating capacity in relation to temperature
Cooling operation
Outdoor air D.B.
temperature
°C D.B.
Heating operation
Indoor air D.B.
temperature
°C D.B.
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
Air inlet temperature of
outdoor unit in ˚CWB
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

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3 ELECTRICAL DATA 3.1 Electrical wiring
Models SRK28HD, 40HD
Power source
1 Phase
220/230/240V 50Hz
Outdoor unit
Indoor unit
LB
CNW
CF I
WH
HEAT
EXCHANGER
CNM
CNU
CNC
Tr
F
(250V 3.15A)
52C-3
52C
52C
Printed circuit
board
Printed circuit
board
1
1
1
5
3
3
52X1
CFO
52X2
52X3
52X3
52X2
52X1
52C-4
N
ZNR
IC8
3
5
1
WH
2/N
3
Y/GN
SM
FM
I
FMo
CM
20S
LB
BR
BK
RD
Y/GN
RD
WH
BR
TB TB
RD
J
Y/GN
G
LNJ
F
(250V 3.15A)
ZNR
BK
BK
2 51C
3
1
CM1
CM2
WH
WH
WH
CC
RD
RD
Y/GN
G1
D.S
BR BL
CNB
CNE CNG
Th1 Th2
CNG
Th4
Th5
Th6
CNB
CNU
Display
Wireless
R-Amp
1
2
3
Black
Brown
Red
Light blue
White
Yellow/Green
BK
BR
RD
LB
WH
Y/GN
Color symbol
Meaning of marks
Symbol Parts name
I
Symbol Parts name
ge temp. thermistor
Symbol Parts name
CFI
CM
F
FMI
FMo
SM
Th1
Th2
Th4
Th5
Th6
Tr
Capacitor for FMI
Compressor motor
Fuse
Fan motor (Indoor)
Fan motor (Outdoor)
Flap motor
Room temp. thermistor
Heat exchanger thermistor (Indoor unit)
Heat exchanger thermistor (Outdoor unit)
Outdoor air temp. thermistor
Discharge temp. thermistor
Transformer
ZNR
20S
52C
DS
52X1-3
51C
Varistor
4 way valve (coil)
Magnetic contactor
Diode stack
Auxiliary relay
Motor Protector for CM

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LO
MID
HI
AUTO
HI POWER ECONO
ON OFF
AM PM
HI POWER TEMP ECONO
AIR FLOW
CANCEL
ON OFF
RESERVE
TIMER
TIME ACL
FAN SPEED
ON
MODE
LO
MID
HI
AUTO
TIME
OFF
HI POWER ECONO
ON OFF
AM PM
FAN SPEED button
Each time the button is pushed, the indi-
cator is switched over in turn.
•The above illustration shows all controls, but in practice
only the relevant parts are shown.
OPERATION MODE select button
Each time the button is pushed, the indi-
cator is switched over in turn.
AIR FLOW button
This button changes the flap mode. When
pressed, this button changes the mode in the
following order:
ON/OFF button
Press for starting operation, press again for
stopping.
HI POWER button
This button changes the HI POWER mode.
ECONOMY button
This button changes the ECONOMY mode.
RESET switch
Switch for resetting microcomputer.
ON TIMER button
This button selects ON TIMER operation.
Clock switch
This switch for setting the clock.
OFF TIMER button
This button selects OFF TIMER operation.
TEMPERATURE button
This button sets the room temperature.
(This button changes the present time and
TIMER time.)
CANCEL button
This button cancels the ON timer and OFF
timer.
RESERVE button
This button sets the present time and
TIMER time.
SIndication section
OPERATION MODE Indicator
Indicates selected operation with lamp.
[ (Auto) • (Cool) • (Heat) • (Dry)]
TEMPERATURE Indicator
Indicates set temperature.
(Does not indicate temperature when operation
mode is on AUTO)
FAN SPEED Indicator
Indicates set air flow rate with lamp.
AIR FLOW Indicator
Shows selected flap mode.
HI POWER MODE indicator
Indicates during Hi power mode operation.
ECONOMY MODE indicator
Indicates during economy mode operation.
ON TIMER Indicator
Indicates during ON TIMER operation.
Clock Indicator
Indicates present time or timer setting time.
OFF TIMER Indicator
Indicates during OFF TIMER operation.
Models All models
Remote controller
SOperation section
(Air scroll) (SWING)
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
4.1 Operation control function by remote control switch

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Unit indication section
RUN (HOT KEEP) light (green)
•Illuminates during operation.
•Flashes at air flow stop due to the ‘HOT KEEP’.
ECONOMY light (orange)
Illuminates during ECONOMY operation.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HI POWER operation.
Models All models

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5 PARTS LIST (Main parts)
(1) Indoor unit
No.
1
2
3
4
5
6
7
8
9
PANEL ASSY, FRONT
PANEL, FRONT
PANEL ASSY, AIR INLET
GRILLE ASSY, AIR OUTLET
MOTOR, AC
IMPELLER
HEAT EXCH ASSY (AIR)
PWB ASSY
CONTROL ASSY, REMOTE
SRK28HD
RKV102A600
RKV122A001G
RKV435A100B
RKV435A101B
SSA511J218
SSA431G042A
RKT502A420
RKV301A500L
RKV301A500M
Parts No.
Parts Name SRK40HD
(2) Outdoor unit
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PANEL, FRONT
PANEL, SIDE (R)
PANEL, SIDE (L)
PANEL, TOP
GRILLE, AIR OUTLET
GUARD, FIN
BRACKET, MOTOR
MOTOR, AC
PROPELLER
BASE ASSY
HEAT EXCH (AIR)
VALVE, S (4WAY)
COIL ASSY, SOLENOID
COMPRESSOR ASSY
PWB ASSY
Parts No.
RSA382F010G
Parts Name SRC40HD
RWC122A003
RWC123A003
RWC123A002
RWC124A003
RWC435A002
RWC131A004
RWC116A041
SSA511C063
SSA431B233
RWC111A003F
RPC311A851
SSA382C078
RCP505A500A
SRC28HD
RCP122A001
RCP123A001
-
RCP124A001
RCP435A001A
-
RCP116A001
SSA511C061B
SSA431B213
RCP111A001
RCP311A001D
SSA382C077
RMC201A002
RCP505A500

WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
Air-Conditioning & Refrigeration Systems Headquarters
16-5, 2-Chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan
Fax: [phone]
No.063 (3A) R