Mitsubishi Heavy Industries SRK20HD-S User manual

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WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Split system, air to air heat pump type)
SRK20HD-S, SRK28HD-S, SRK40HD-S
(Split system, air cooled cooling only type)
SRK20CD-S, SRK28CD-S, SRK40CD-S
TECHNICAL MANUAL
Collection data
Manual No. ’04
.
SRK-T
.
040

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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 .................................................................. 8
2.3 Exterior dimensions ................................................................................. 8
2.4 Piping system ........................................................................................... 10
2.5 Selection chart .......................................................................................... 11
3. ELECTRICAL DATA ........................................................................................ 12
3.1 Electrical wiring ........................................................................................ 12
4. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ................... 14
4.1 Operation control function by remote control switch........................... 14
4.2 Back-up switch ......................................................................................... 15
4.3 Power blackout auto restart function...................................................... 15
4.4 Flap control ............................................................................................... 16
4.5 Comfortable timer setting ........................................................................ 16
4.6 Outline of heating operation.................................................................... 17
4.7 Outline of cooling operation.................................................................... 20
4.8 Outline of dehumidifying operation ........................................................ 21
4.9 Automatic operation................................................................................. 22
4.10 Outline of fan operation ........................................................................... 22
4.11 Protective control function ...................................................................... 23
5. APPLICATION DATA....................................................................................... 25
5.1 Selection of location for installation....................................................... 26
5.2 Installation of indoor unit......................................................................... 27
5.3 Installation of outdoor unit ...................................................................... 29
5.4 Refrigerant piping..................................................................................... 29
5.5 Test run...................................................................................................... 31
5.6 Precautions for wireless remote controller installation and
operation ................................................................................................... 32
6. MAINTENANCE DATA .................................................................................... 33
6.1 Trouble shooting....................................................................................... 33
6.2 Servicing.................................................................................................... 38

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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.
1.2 How to read the model name
Example : SR K 40 H D - 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)
R410A models
Series No.
H: Heat pump type
C: Cooling only type
Product capacity
Wall mounted type
Split type room air-conditioner

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Item Model SRK20HD-S SRC20HD-S
Cooling capacity(1) W 2050
Heating capacity(1) W 2200
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.63
Running current (Cooling) A 3.1/3.0/2.9
Heating input kW 0.6
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 Hi 34, Me 28, Lo 26 46
Noise level Power level dB 52 60
Heating sound level Hi 34, Me 31, Lo 27 46
Power level 52 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 –RM-B5077MNE4 (Rotary type) ×1
Motor kW –0.65
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic 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 SRK20HD-S (Indoor unit)
SRC20HD-S (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC24ºC ISO-T1, JIS C9612
Heating 20ºC–7ºC6ºC 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, Frost protection
The piping length is 7.5m.

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Item Model SRK28HD-S SRC28HD-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 0.77
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 Hi 39, Me 33, Lo 30 46
Noise level Power level dB 55 60
Heating sound level Hi 40, Me 33, Lo 29 46
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 –5PS102DAB [Rotary type] ×1
Motor kW –0.7
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic 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) 8.0 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.
Model SRK28HD-S (Indoor unit)
SRC28HD-S (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC24ºC ISO-T1, JIS C9612
Heating 20ºC–7ºC6ºC 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, Frost protection
The piping length is 7.5m.

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Model SRK40HD-S (Indoor unit)
SRC40HD-S (Outdoor unit)
Item Model SRK40HD-S SRC40HD-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 1.16
Running current (Heating) A 5.5/5.3/5.1
Inrush current A 25.2
COP Cooling: 3.21 Heating: 3.42
Cooling sound level Hi 40, Me 38, Lo 34 49
Noise level Power level dB 56 63
Heating sound level Hi 41, Me 38, Lo 34 50
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 –5KS150DBB [Rotary type] ×1
Motor kW –1.1
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic 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) 9.0 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.
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC24ºC ISO-T1, JIS C9612
Heating 20ºC–7ºC6ºC 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, Frost protection
The piping length is 7.5m.

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Item Model SRK20CD-S SRC20CD-S
Cooling capacity(1) W 2050
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.63
Running current (Cooling) A 3.1/3.0/2.9
Inrush current A 18.9
COP Cooling: 3.21
Cooling sound level Hi 34, Me 28, Lo 26 46
Noise level Power level dB 52 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 –RM-B5077MNE4 (Rotary type) ×1
Motor kW –0.65
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic 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
Air flow (at High) (Cooling) 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.
Model SRK20CD-S (Indoor unit)
SRC20CD-S (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC24ºC 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, Frost protection
The piping length is 7.5m.

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Item Model SRK28CD-S SRC28CD-S
Cooling capacity(1) W 2550
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.79
Running current (Cooling) A 3.9/3.7/3.5
Inrush current A 17.2
COP Cooling: 3.21
Cooling sound level Hi 39, Me 33, Lo 30 46
Noise level Power level dB 55 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 –5PS102DAB [Rotary type] ×1
Motor kW –0.7
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic 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
Air flow (at High) (Cooling) 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 SRK28CD-S (Indoor unit)
SRC28CD-S (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC24ºC 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, Frost protection
The piping length is 7.5m.

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Item Model SRK40CD-S SRC40CD-S
Cooling capacity(1) W 3600
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 1.12
Running current (Cooling) A 5.3/5.1/4.9
Inrush current A 25.2
COP Cooling: 3.21
Cooling sound level Hi 40, Me 38, Lo 34 49
Noise level Power level dB 56 63
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 –5KS150DBB [Rotary type] ×1
Motor kW –1.1
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic 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
Air flow (at High) (Cooling) 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 SRK40CD-S (Indoor unit)
SRC40CD-S (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC24ºC 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, Frost protection
The piping length is 7.5m.

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2.2 Range of usage & limitations
2.3 Exterior dimensions
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. 10m (Outdoor unit is higher) Max. 10m (Outdoor unit is lower)
Item
Models
(1) Indoor unit
Models All models
VIEW A
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)
( )
20.28:ø9.52
40:ø12.7 397.1
45
14.5
60
788
560
45
815
A
250
Unit: mm
Piping hole right(left)
Terminal block
960
45
3
249