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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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