Mitsubishi Heavy Industries SRK20HG User manual

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3
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WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
TECHNICAL MANUAL
Collection data
Manual No. ’07
.
SRK-T
.
064
(Split system, air to air heat pump type)
SRK20HG
SRK28HG
SRK40HG

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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 ................... 11
4.1 Operation control function by remote control switch ........................... 11
4.2 Unit ON/OFF button .................................................................................. 12
4.3 Power blackout auto restart function ..................................................... 12
4.4 Custom cord switching procedure ......................................................... 13
4.5 Flap control ............................................................................................... 13
4.6 Timer operation ......................................................................................... 14
4.7 Outline of heating operation .................................................................... 15
4.8 Outline of cooling operation .................................................................... 18
4.9 Outline of dehumidifying operation ........................................................ 19
4.10 Outline of automatic operation................................................................ 20
4.11 Outline of clean operation ....................................................................... 20
4.12 Protective control function ...................................................................... 21
5. APPLICATION DATA ....................................................................................... 23
5.1 Selection of location for installation ....................................................... 24
5.2 Installation of indoor unit......................................................................... 25
5.3 Installation of outdoor unit ...................................................................... 28
5.4 Connection of refrigerant piping ............................................................. 28
5.5 Test run ...................................................................................................... 30
5.6 Precautions for wireless remote control installation and
operation ................................................................................................... 30
6. MAINTENANCE DATA .................................................................................... 31
6.1 Trouble shooting....................................................................................... 31
6.2 Servicing.................................................................................................... 36

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1 GENERAL INFORMATION
1.1 Specific features
The “MITSUBISHI HEAVY INDUSTRIES, LTD.” 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 operation 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 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 20 H G
Room temperature sensor error
Indoor fan motor error
Heat exchanger sensor error
2 time flash
6 time flash
TIMER light
ON
1 time flash
RUN light
Outdoor unit heat exchanger
sensor error
Discharge pipe sensor error
Outdoor temperature sensor error
2 time flash
4 time flash
RUN light
keeps flashing
1 time flash
OFF
OFF
OFF
TIMER light Outdoor (LED)
Error of signal transmission
Trouble of outdoor unit
Over heat of compressor
2 time flash
5 time flash
RUN light
ON
2 time flash
5 time flash
6 time flash 6 time flash

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Item
Model SRK20HG SRC20HG
Cooling capacity(1) W 2070
Heating capacity(1) W 2360
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.655
Running current (Cooling) A 2.9/3.1/3.3
Heating input kW 0.64
Running current (Heating) A 2.9/3.1/3.3
Inrush current A 15.5
COP Cooling: 3.16 Heating: 3.69
Cooling Sound level Hi: 35 , Me: 28 , Lo: 26 44
Noise level Power level dB 53 59
Heating Sound level Hi: 34 , Me: 31 , Lo: 27 45
Power level 53 59
Exterior dimensions
Height ×Width ×Depth mm 268 ×790 ×199 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 8.5 28
Refrigerant equipment
Compressor type & Q’ty –2RS127D5AA04 (Rotary type) ×1
Motor kW –0.6
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 0.73 (Pre-Charged up to the piping length of 7m)
Refrigerant oil R0.29 (ATMOS NM56M or SUNISO 4GDID)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 14
(Cooling) 7.5 27
Air flow (at High) (Heating) CMM 7.5 27
Air filter, Q’ty Polypropylene net (washable) ×2–
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote control –
Room temperature control Microcomputer 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 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, Clean filter (Natural enzyme filter ×1, Photocatalytic washable deodorizing filter ×1)
Optional parts –
Notes (1) The data are measured at the following conditions.
2 SELECTION DATA
2.1 Specifications
Model SRK20HG (Indoor unit)
SRC20HG (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 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 m.
Compressor overheat protection, High pressure
control, Serial signal error protection
(220/230/240V)

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Model SRK28HG (Indoor unit)
SRC28HG (Outdoor unit)
Item
Model SRK28HG SRC28HG
Cooling capacity(1) W 2530
Heating capacity(1) W 2670
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.77
Running current (Cooling) A 3.6/3.4/3.2
Heating input kW 0.685
Running current (Heating) A 3.2/3.0/2.8
Inrush current A 16.4
COP Cooling: 3.29 Heating: 3.90
Cooling Sound level Hi: 39, Me: 33, Lo: 30 45
Noise level Power level dB 55 60
Heating Sound level Hi: 39, Me: 33, Lo: 29 44
Power level 56 60
Exterior dimensions
Height ×Width ×Depth mm 268 ×790 ×199 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 8.5 31
Refrigerant equipment
Compressor type & Q’ty –2PS146D5BC04 (Rotary type) ×1
Motor kW –0.7
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 0.89 (Pre-Charged up to the piping length of 7m)
Refrigerant oil R0.32 (ATMOS NM56M or SUNISO 4GDID)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 15
(Cooling) 8.5 29
Air flow (at High) (Heating) CMM 9.5 29
Air filter, Q’ty Polypropylene net (washable) ×2–
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote control –
Room temperature control Microcomputer 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 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, Clean filter (Natural enzyme filter ×1, Photocatalytic washable deodorizing filter ×1)
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 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 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 m.
Compressor overheat protection, High pressure
control, Serial signal error protection
(220/230/240V)

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Model SRK40HG (Indoor unit)
SRC40HG (Outdoor unit)
Item
Model SRK40HG SRC40HG
Cooling capacity(1) W 3500
Heating capacity(1) W 3700
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 1.09
Running current (Cooling) A 5.0/4.8/4.6
Heating input kW 1.09
Running current (Heating) A 5.0/4.8/4.6
Inrush current A 27.0
COP Cooling: 3.21 Heating: 3.39
Cooling Sound level Hi: 40, Me: 38, Lo: 34 48
Noise level Power level dB 56 63
Heating Sound level Hi: 40, Me: 38, Lo: 34 50
Power level 57 64
Exterior dimensions
Height ×Width ×Depth mm 268 ×790 ×199 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 8.5 38
Refrigerant equipment
Compressor type & Q’ty –2KS206D3AC04 (Rotary type) ×1
Motor kW –0.95
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 1.1 (Pre-Charged up to the piping length of 7m)
Refrigerant oil R0.41 (ATMOS NM56M or SUNISO 4GDID)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 22
(Cooling) 9.0 32
Air flow (at High) (Heating) CMM 10.0 32
Air filter, Q’ty Polypropylene net (washable) × 2 –
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote control –
Room temperature control Microcomputer 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 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, Clean filter (Natural enzyme filter ×1, Photocatalytic washable deodorizing filter ×1)
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 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 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 m.
Frost protection, Serial signal error protection
Fan motor error protection
Compressor overheat protection, High pressure
control, Serial signal error protection
(220/230/240V)

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2.2 Range of usage & limitations
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length Max. 15m
All models
Power source voltage Rating ±10%
Voltage at starting Min. 85% of rating
Frequency of ON-OFF cycle
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
Max. 10 times/h
(Inching prevention 3 minutes)
Cooling operation : Approximately 21 to 32˚C
Heating operation : Approximately 15 to 30˚C
Cooling operation : Approximately 21 to 43˚C
Heating operation : Approximately -5 to 21˚C
2.3 Exterior dimensions
(1) Indoor unit
Models All models
Piping hole (ø65)
( )
Piping hole (ø65)
53.5
380.6
Pipng for Liquid 448.6 (ø6.35)
20, 28 : ø9.52
40 : ø12.7
Pipng for Gas
Drain hose 520 (ø16)
53.5
44.5
252.2 7.5
8.3
102.5
585
102.5
133.5450206.5
202450138
44.5 43.2
39.3
200
45
45
60
17.5 60 27
788
60
9
45
199 3
Terminal block
Piping hole right(left)
268
790
A
VIEW A
®
Unit: mm

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(2) Outdoor unit
Models All models
2-16×12
Drain holes (ø20)
138.4
40˚
61.9
18.9165.1510104.9
439.1
111.4
99.4
349.5
313.1
43.1
290
12
50
350
23.5312.5
14
33.5
40˚
42.595.9
14
540
780
Service valve (Liquid)
Flare connection ø6.35 (1/4'')
Service valve (Gas)
Flare connection
20, 28: ø9.52 (3/8'')
40: ø12.7 (1/2'')
Terminal block

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2.4 Piping system
Model SRK40HG
Outdoor unitIndoor unit
Flare connecting
Room temp.
sensor
Heat
exchanger
Flare connecting
Piping
(Liquid)
ø6.35
Heat
exchanger
sensor
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.
sensor
Muffler
Heat exchanger
sensor
Heat
exchanger
Outdoor air
temp. sensor
Cooling cycle
Heating cycle
Models SRK20HG, 28HG
Outdoor unitIndoor unit
Flare connecting
Room temp.
sensor
Heat
exchanger
Flare connecting
Piping
(Liquid)
ø6.35
Heat
exchanger
sensor
Piping
(Gas)
ø12.7
Service valve
(Gas)
Check joint
4 way valve
Service valve (Liquid)
Strainer
Capillary tube
Compressor
Accumulator
Discharge temp.
sensor
Heat exchanger
sensor
Heat
exchanger
Outdoor air
temp. sensor
Cooling cycle
Heating cycle
Check valve
Muffler

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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 SRK20HG 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 = 2070 ✕0.975 ✕1.0 =2018 W
SRK20HG Length 15m Factor by air
temperatures
15
ISO-T1 Standard ConditionOutdoor air W.B. temperature ˚C W.B.
1005-5
16 18 20 22 24
20
ISO-T1 Standard ConditionIndoor air W.B. temperature ˚C W.B.
Heating
Applicable range
27
25
20
15
21
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
Cooling
Heating operation
Indoor air D.B.
temperature
˚C D.B.
Cooling operation
Outdoor air D.B.
temperature
˚C D.B.
Coefficient of cooling & Heating capacity in relation to temperature
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
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00