Mitsubishi Heavy Industries SRK20ZGX-S User manual

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INVERTER WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
SRK20ZGX-S, 25ZGX-S, 35ZGX-S, 50ZGX-S
TECHNICAL MANUAL
Collection data
Manual No. ’07
.
SRK-T
.
065

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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 ............................................................... 6
2.3 Exterior dimensions .............................................................................. 6
2.4 Piping system ........................................................................................ 8
2.5 Selection chart ....................................................................................... 9
3. ELECTRICAL DATA ..................................................................................... 10
3.1 Electrical wiring ..................................................................................... 10
4. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ................ 12
4.1 Operation control function by remote control switch ........................ 12
4.2 Unit ON/OFF button ............................................................................... 13
4.3 Power blackout auto restart function................................................... 13
4.4 Custom cord switching procedure ....................................................... 14
4.5 Flap and louver control ......................................................................... 14
4.6 Timer operation...................................................................................... 14
4.7 Outline of heating operation ................................................................. 15
4.8 Outline of cooling operation ................................................................. 16
4.9 Outline of automatic operation............................................................. 16
4.10 Protective control function ................................................................... 17
5. APPLICATION DATA .................................................................................... 22
5.1 Selection of location for installation .................................................... 23
5.2 Installation of indoor unit ...................................................................... 24
5.3 Installation of outdoor unit ................................................................... 27
5.4 Refrigerant piping .................................................................................. 27
5.5 Test run ................................................................................................... 29
5.6 Precautions for wireless remote control installation and operation...... 29
6. MAINTENANCE DATA.................................................................................. 30
6.1 Troubleshooting procedures for electrical equipment ....................... 30
6.2 Servicing................................................................................................. 50
7. REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL
FOR AIR CONDITIONERS USING R410A .................................................. 51
7.1 Outline .................................................................................................... 51
7.2 Refrigerant piping installation .............................................................. 52
7.3 Installation, removal and servicing ...................................................... 58
7.4 Refrigerant recovery .............................................................................. 63

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Over heat of compressor
Error of signal transmission
Outdoor fan motor error
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) Inverter (Frequency converter) for multi-steps power control
¡Heating/Cooling
The rotational speed of a compressor is changed in step in relation to varying load, interlocked with the indoor and outdoor unit
fans controlled to change frequency, thus controlling the capacity.
¡Allowing quick heating/cooling operation during start-up period. Constant room temperature by fine-tuned control after the
unit has stabilized.
(2) Fuzzy control
¡Fuzzy control calculates the amount of variation in the difference between the return air temperature and the setting tempera-
ture in compliance with the fuzzy rules in order to control the air capacity and the inverter frequency.
(3) Remote control flap & louver
The Flap & louver can be automatically controlled by operating wireless remote control.
¡Flap swing : The flaps swing up and down successively.
¡Louver swing : The louvers swing left and right successively.
¡Memory flap : Once the Flap & louver position is set, the unit memorizes the position and continues to operate at the same
position from the next time.
(4) 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.
Outdoor heat exchanger sensor
error
Discharge pipe sensor error
Outdoor air temperature sensor
error
2 time flash
4 time flash
RUN light
keeps flashing
1 time flash
Trouble of outdoor unit
Over current
Current cut
2 time flash
3 time flash
RUN light
ON
1 time flash
5 time flash
TIMER light
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
Rotor lock
6 time flash
7 time flash
2 time flash
RUN light
2 time flash
1.2 How to read the model name
Example : SR K 35 Z GX - S
R410A models
Series No.
Inverter type
Product capacity
Wall mounted type
Split type room air-conditioner

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2 SELECTION DATA
2.1 Specifications
Model SRK20ZGX-S (Indoor unit)
SRC20ZGX-S (Outdoor unit)
Item
Model SRK20ZGX-S SRC20ZGX-S
Cooling capacity(1) W 2000 (500~2800)
Heating capacity(1) W 2400 (500~4600)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 0.37 (0.1~0.91)
Running current (Cooling) A 2.1/2.0/1.9
Heating input kW 0.44 (0.09~1.27)
Running current (Heating) A 2.5/2.4/2.3
Inrush current A 2.5/2.4/2.3
COP Cooling: 5.41 Heating: 5.45
Cooling Sound level Hi 42, Me 34, Lo 21 44
Noise level Power level dB 57 57
Heating Sound level Hi 42, Me 35, Lo 25 43
Power level 58 57
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 12 38
Refrigerant equipment
Compressor type & Q’ty –RM-B5077MD1 (Rotary type) ×1
Motor kW –0.75
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.2 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.35 (MA68)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 27 24
(Cooling) 11.8 30
Air flow (at High) (Heating) CMM 12 25
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: 0.54 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Recommended breaker size A 16
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 (Allergen clear 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 15 m connecting piping.
(Purging is not required even for the short piping.)
Operation data
(1)
Refrigerant
piping
Compressor overheat protection, Heating overload protection (High pressure control), Overcurrent protection,
Frost protection, Serial signal error protection, Indoor fan motor error protection, Cooling overload protection
The piping length is 7.5m.
(220/230/240V)

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Item
Model SRK25ZGX-S SRC25ZGX-S
Cooling capacity(1) W 2500 (500 ~ 3000)
Heating capacity(1) W 3000 (500 ~ 5000)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 0.50 (0.10 ~ 0.64)
Running current (Cooling) A 2.5/2.4/2.3
Heating input kW 0.59 (0.09 ~ 1.16)
Running current (Heating) A 2.9/2.8/2.7
Inrush current A 2.9/2.8/2.7
COP Cooling: 5.00 Heating: 5.08
Cooling Sound level Hi 43, Me 34, Lo 21 45
Noise level Power level dB 58 58
Heating Sound level Hi 43, Me 36, Lo 26 47
Power level 59 59
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 12 38
Refrigerant equipment
Compressor type & Q’ty –RM-B5077MD1 (Rotary type) ×1
Motor kW –0.75
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.2 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.35 (MA68)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 27 24
(Cooling) 11.8 30
Air flow (at High) (Heating) CMM 12 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 light 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: 0.54 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Recommended breaker size A 16
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 (Allergen clear 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 15 m connecting piping.
(Purging is not required even for the short piping.)
Operation data
(1)
Refrigerant
piping
Compressor overheat protection, Heating overload protection (High pressure control), Overcurrent protection,
Frost protection, Serial signal error protection, Indoor fan motor error protection, Cooling overload protection
The piping length is 7.5m.
(220/230/240V)
Model SRK25ZGX-S (Indoor unit)
SRC25ZGX-S (Outdoor unit)

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Item
Model SRK35ZGX-S SRC35ZGX-S
Cooling capacity(1) W 3500 (500 ~ 3900)
Heating capacity(1) W 4200 (500 ~ 5100)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 0.87 (0.10 ~ 0.98)
Running current (Cooling) A 4.2/4.0/3.8
Heating input kW 1.00 (0.09 ~ 1.19)
Running current (Heating) A 4.9/4.7/4.5
Inrush current A 4.9/4.7/4.5
COP Cooling: 4.02 Heating: 4.20
Cooling Sound level Hi 44, Me 35, Lo 22 47
Noise level Power level dB 59 60
Heating Sound level Hi 44, Me 37 , Lo 27 50
Power level 60 63
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 12 38
Refrigerant equipment
Compressor type & Q’ty –RM-B5077MD1 [Rotary type] ×1
Motor kW –0.90
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.2 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.35 (MA68)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 27 24
(Cooling) 12 30
Air flow (at High) (Heating) CMM 12.2 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 light 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: 0.54 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Recommended breaker size A 16
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 (Allergen clear filter ×1, Photocatalytic washable deodorizing filter ×1)
Optional parts –
Notes (1) The data are measured at the following conditions.
Model SRK35ZGX-S (Indoor unit)
SRC35ZGX-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 for the short piping.)
Operation data
(1)
Refrigerant
piping
Compressor overheat protection, Heating overload protection (High pressure control), Overcurrent protection,
Frost protection, Serial signal error protection, Indoor fan motor error protection, Cooling overload protection
The piping length is 7.5m.
(220/230/240V)

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Model SRK50ZGX-S (Indoor unit)
SRC50ZGX-S (Outdoor unit)
Item
Model SRK50ZGX-S SRC50GX-S
Cooling capacity(1) W 5000 (600~5300)
Heating capacity(1) W 6000 (600~7900)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 1.56 (0.12~2.1)
Running current (Cooling) A 7.5/7.2/6.9
Heating input kW 1.66 (0.11~2.71)
Running current (Heating) A 7.9/7.6/7.3
Inrush current A 7.9/7.6/7.3
COP Cooling: 3.21 Heating: 3.61
Cooling Sound level Hi 45, Me 38, Lo 26 48
Noise level Power level dB 60 61
Heating Sound level Hi 47, Me 39, Lo 34 50
Power level 62 65
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 640 ×850 ×290
Color Fine snow Stucco white
Net weight kg 12 43
Refrigerant equipment
Compressor type & Q’ty –5CS102XFA [Scroll type] ×1
Motor kW –1.5
Starting method – Line starting
Heat exchanger Slit fins + Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.35 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.36 (RB68A)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 27 34
(Cooling) 12.5 42
Air flow (at High) (Heating) CMM 13.5 42
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: 054 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Recommended breaker size A 20
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 (Allergen clear 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 15 m connecting piping.
(Purging is not required even for the short piping.)
If the piping length is longer, when it is 15 to 25m, add 20 g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
Compressor overheat protection, Heating overload protection (High pressure control), Overcurrent protection,
Frost protection, Serial signal error protection, Indoor fan motor error protection, Cooling overload protection
The piping length is 7.5m.
(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
SRK20ZGX-S, 25ZGX-S, 35ZGX-S SRK50ZGX-S
     
     
     
     
Power source voltage   
Voltage at starting   ! 
Frequency of ON-OFF cycle
ON and OFF interval   "#
  #$%
&'(% )  *  + #$% &'(% )  *
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)
Max. 25m
Max. 15m (Outdoor unit is higher)
Max. 15m (Outdoor unit is lower)
Item
Models
2.3 Exterior dimensions
(1) Indoor unit
Models All models


A
  



    


 






VIEW A
 




     
 
   ! 
"    
    

## 
 
  $  

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 








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7
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(2) Outdoor unit
Models SRC20ZGX-S, 25ZGX-S, 35ZGX-S
 




 

  

 ´ 
 

 
   !"#
$ %&&#
  '#
$ %&&#
'!"
(
 
)
)





Model SRC50ZGX-S
 ´ 
  



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8
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2.4 Piping system
Models SRK20ZGX-S, 25ZGX-S, 35ZGX-S
Outdoor unitIndoor unit
Room temp.
sensor
Heat
exchanger
Flare connection
Heat
exchanger
sensor
Piping
(Liquid)
ø6.35
Check joint
4 way valve
Service valve (Liquid)
Flare connetion
Discharge pipe
temp. sensor
Cooling cycle
Heating cycle Outdoor air
temp. sensor
Heat
exchanger
Heat exchanger
sensor
Compressor
Capillary tube
Strainer
Accumulator
Service valve
(Gas)
Electronic
expansion valve
Piping
(Gas)
ø9.52
Model SRK50ZGX-S
Outdoor unitIndoor unit
Room temp.
sensor
Heat
exchanger
Flare connection
Heat
exchanger
sensor
Piping
(Liquid)
ø6.35
Check joint
4 way valve
Service valve (Liquid)
Flare connection
Discharge pipe
temp. sensor
Cooling cycle
Heating cycle Outdoor air
temp. sensor
Heat
exchanger
Heat exchanger
sensor
Compressor
Capillary tube
Strainer
Strainer
Service valve
(Gas)
Capillary tube
Electronic
expansion valve
Piping
(Gas)
ø12.7
Muffler
Capillary tube