Mitsubishi Heavy Industries SRK20HC-S User manual

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WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Split system, air to air heat pump type)
SRK20HC-S, SRK28HC-S, SRK40HC-S
TECHNICAL MANUAL
Collection data
Manual No. ’03
.
SRK-T
.
031

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1
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CONTENTS
1. GENERAL INFORMATION .............................................................................. 1
1.1 Specific features ....................................................................................... 1
1.2 How to read the model name ................................................................... 1
2. SELECTION DATA........................................................................................... 2
2.1 Specifications ........................................................................................... 2
2.2 Range of usage & limitations .................................................................. 5
2.3 Exterior dimensions ................................................................................. 5
2.4 Piping system ........................................................................................... 7
2.5 Selection chart .......................................................................................... 8
3. ELECTRICAL DATA ........................................................................................ 9
3.1 Electrical wiring ........................................................................................ 9
4. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ................... 10
4.1 Operation control function by remote control switch ........................... 10
4.2 Back-up switch.......................................................................................... 11
4.3 Power-cut compensation ......................................................................... 11
4.4 Flap control ............................................................................................... 12
4.5 Comfort timer setting ............................................................................... 12
4.6 Outline of heating operation .................................................................... 13
4.7 Outline of cooling operation .................................................................... 16
4.8 Outline of dehumidifying operation ........................................................ 17
4.9 Automatic operation ................................................................................. 18
4.10 Protective control function ...................................................................... 18
5. APPLICATION DATA ....................................................................................... 20
5.1 Selection of location for installation ....................................................... 21
5.2 Installation of indoor unit......................................................................... 22
5.3 Installation of outdoor unit ...................................................................... 24
5.4 Refrigerant piping ..................................................................................... 24
5.5 Test run ...................................................................................................... 26
5.6 Precautions for wireless remote controller installation and
operation ................................................................................................... 26
6. MAINTENANCE DATA..................................................................................... 27
6.1 Trouble shooting ....................................................................................... 27
6.2 Servicing.................................................................................................... 32

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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.
R410A models
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 C - S
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 SRK20HC-S SRC20HC-S
Cooling capacity(1) W 2050
Heating capacity(1) W 2200
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.635
Running current (Cooling) A 3.1/3.0/2.9
Heating input kW 0.605
Running current (Heating) A 3.0/2.9/2.8
Inrush current A 18.9
COP Cooling: 3.21 Heating: 3.61
Cooling sound level 38 48
Noise level Power level dB 52 60
Heating sound level 38 48
Power level 52 60
Exterior dimensions
Height ×Width ×Depth mm 250 ×815 ×247 540 ×720 ×290
Color Cool white Stucco white
Net weight kg 9.0 32
Refrigerant equipment
Compressor type & Q’ty –RM-B5077MNE4 (Rotary type) ×1
Motor kW –0.65
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electric expansion valve
Refrigerant(3) kg R410A 0.9 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.35 (MA68)
Deice control MC control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 12
(Cooling) 7.5 26
Air flow (at High) (Heating) CMM 7.5 26
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 SRK20HC-S (Indoor unit)
SRC20HC-S (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 15 m connecting piping.
(Purging is not required even in the short piping.)
Operation data
(1)
Refrigerant
piping
Compressor: Overheat protection, overcurrent protection, Serial signal error protection, Indoor fan mo-
tor error protection
The piping length is 7.5m.

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Item
Model SRK28HC-S SRC28HC-S
Cooling capacity(1) W 2550
Heating capacity(1) W 2800
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.79
Running current (Cooling) A 3.9/3.7/3.5
Heating input kW 0.775
Running current (Heating) A 3.7/3.5/3.3
Inrush current A 17.2
COP Cooling: 3.21 Heating: 3.61
Cooling sound level 41 48
Noise level Power level dB 55 60
Heating sound level 42 48
Power level 56 60
Exterior dimensions
Height ×Width ×Depth mm 250 ×815 ×247 540 ×720 ×290
Color Cool white Stucco white
Net weight kg 9.0 32
Refrigerant equipment
Compressor type & Q’ty –5PS102DAB [Rotary type] ×1
Motor kW –0.7
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electric expansion valve
Refrigerant(3) kg R410A 0.9 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.35 (RB68A)
Deice control MC control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 15
(Cooling) 8.5 30
Air flow (at High) (Heating) CMM 8.0 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.
Model SRK28HC-S (Indoor unit)
SRC28HC-S (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 15 m connecting piping.
(Purging is not required even in the short piping.)
Operation data
(1)
Refrigerant
piping
Compressor: Overheat protection, overcurrent protection, Serial signal error protection, Indoor fan
motor error protection
The piping length is 7.5m.

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Item
Model SRK40HC-S SRC40HC-S
Cooling capacity(1) W 3600
Heating capacity(1) W 4000
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 1.12
Running current (Cooling) A 5.3/5.1/4.9
Heating input kW 1.165
Running current (Heating) A 5.5/5.3/5.1
Inrush current A 25.2
COP (Cooling) Cooling: 3.21 Heating: 3.42
Cooling sound level 42 51
Noise level Power level dB 56 63
Heating sound level 43 52
Power level 57 64
Exterior dimensions
Height ×Width ×Depth mm 250 ×815 ×247 640 ×850 ×290
Color Cool white Stucco white
Net weight kg 9.0 41
Refrigerant equipment
Compressor type & Q’ty –5KS150DBB [Rotary type] ×1
Motor kW –1.1
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electric expansion valve
Refrigerant(3) kg R410A 1.17 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.43 (RB68A)
Deice control MC control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 35
(Cooling) 9.5 38
Air flow (at High) (Heating) CMM 9.0 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 SRK40HC-S (Indoor unit)
SRC40HC-S (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 15 m connecting piping.
(Purging is not required even in the short piping.)
Operation data
(1)
Refrigerant
piping
Compressor: Overheat protection, overcurrent protection, Serial signal error protection, Indoor fan
motor error protection
The piping length is 7.5m.

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2.2 Range of usage & limitations
2.3 Exterior dimensions
(1) Indoor unit
Models SRK20HC-S, 28HC-S, 40HC-S
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
A
VIEW A
815
117.5 580 117.5
247
4.5
4.5
4.5
3
560
788
60 14.5
60
9
148.5
216.5
216.5
216.5
8.2
44.5
236.1
5.7
450
450
67.5
42.7 47.2
175
44.5
216.5
216.5
216.5
148.5
53.5
250
Piping for Gas
Therminal block
Piping hole right (left)
Drain hose 540 (ø16)
Piping for Liquid 465.1 (ø6.35)
Piping hole (ø65) Piping hole (ø65)
( )
20.28: ø9.52
40: ø12.7 397.1

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(2) Outdoor unit
Models SRC20HC-S, 28HC-S
Drain hole
286.4
12
50
290
49.6 43.5
850
203.1 510 136.9
476
Elogated hole
(2-12 x16)
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 SRC40HC-S
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
Models SRK20HC-S, 28HC-S, 40HC-S
Outdoor unitIndoor unit
Room temp.
thermistor
Heat
exchanger
Flare connecting
Heat
exchanger
thermistor
Piping
(Liquid)
ø6.35
Check joint
4 way valve
Service valve (Liquid)
Flare connecting
Discharge temp.
thermistor
Cooling cycle
Heating cycle Outdoor air
temp. thermistor
Heat
exchanger
Heat exchanger
thermistor
Compressor
Capillary tube
Strainer
Accumulator
Service valve
(Gas)
Capillary tube
Electronic
expansion valve
( )
Piping
(Gas)
20, 28 : ø9.52
40 : ø12.7

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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 SRK40HC-S 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
SRK40HC-S 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