Mitsubishi Heavy Industries SRK20ZG-S User manual

INVERTER WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
SRK20ZG-S, SRK25ZG-S, SRK35ZG-S, SRK50ZG-S
Manual No. ’06
.
SRK-T
.
060

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 .............................................. 13
4.5 Flap and louver control................................................................. 14
4.6 3D auto operation .......................................................................... 15
4.7 Timer operation ............................................................................. 16
4.8 Installation location setting .......................................................... 16
4.9 Outline of heating operation ........................................................ 17
4.10 Outline of cooling operation ........................................................ 18
4.11 Outline of automatic operation .................................................... 18
4.12 Protective control function........................................................... 19
5 APPLICATION DATA ............................................................................. 24
5.1 Selection of location for installation ........................................... 25
5.2 Installation of indoor unit ............................................................. 26
5.3 Installation of outdoor unit ........................................................... 29
5.4 Connection of refrigerant pipings ............................................... 29
5.5 Test run .......................................................................................... 31
5.6 Precautions for wireless remote control installation and
operation ........................................................................................ 31

6 MAINTENANCE DATA .......................................................................... 32
6.1 Troubleshooting procedures for electrical equipment .............. 32
6.2 Servicing ........................................................................................ 51
7 INTERFACE KIT (OPTIONAL PARTS).................................................. 52
7.1 Applicable model........................................................................... 52
7.2 List of connectable devices ......................................................... 52
7.3 Exterior dimensions ...................................................................... 52
7.4 Circuit board component layout .................................................. 52
7.5 System configuration.................................................................... 53
7.6 Installation of interface kit ............................................................ 54
7.7 Wired remote control .................................................................... 59
7.8 Insatallation of wired remote control .......................................... 60
7.9 Setting functions using the wired remote control ..................... 61
7.10 Super link adapter ......................................................................... 65
7.11 Operation permission/prohibition control .................................. 67
7.12 External control (remote display) /control of input signal......... 68
8 REFRIGERANT PIPING INSTALLATION / SERVICING MANUAL
FOR AIR CONDITIONERS USING R410A........................................... 69
8.1 Outline ............................................................................................ 69
8.2 Refrigerant piping installation ..................................................... 70
8.3 Installation, removal and servicing.............................................. 76
8.4 Refrigerant recovery ..................................................................... 81

-
1
-
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 temperature
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.
¡3D auto operation : Fan speed and air flow direction are automatically controlled, allowing the entire room to be efficiently
conditioned.
¡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 liquid
pipe sensor error
Discharge pipe sensor error
Outdoor 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
R410A models
Series No.
Inverter type
Product capacity
Wall mounted type
Split type room air-conditioner
1.2 How to read the model name
Example : SR K 35 Z G - S
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
4 time flash Power transistor error

-
2
-
Item
Model SRK20ZG-S SRC20ZG-S
Cooling capacity(1) W 2000 (500~2800)
Heating capacity(1) W 2700 (500~4600)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 0.44 (0.1~0.91)
Running current (Cooling) A 2.4/2.3/2.2
Heating input kW 0.62 (0.09~1.27)
Running current (Heating) A 3.0/2.9/2.8
Inrush current A 3.0/2.9/2.8
COP Cooling: 4.55 Heating: 4.35
Cooling Sound level Hi 35, Me 29, Lo 21 44
Noise level Power level dB 51 58
Heating Sound level Hi 35, Me 32, Lo 25 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 35
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 0.9 (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 38 24
(Cooling) 7.4 30
Air flow (at High) (Heating) CMM 8.5 23
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), 3D AUTO (Green)
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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)
Optional parts Interface kit
Notes (1) The data are measured at the following conditions.
2 SELECTION DATA
2.1 Specifications
Model SRK20ZG-S (Indoor unit)
SRC20ZG-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.)
(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold separately)
can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.
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)

-
3
-
Item
Model SRK25ZG-S SRC25ZG-S
Cooling capacity(1) W 2500 (500~3000)
Heating capacity(1) W 3400 (500~4800)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 0.62 (0.1~0.97)
Running current (Cooling) A 3.1/3.0/2.9
Heating input kW 0.93 (0.09~1.30)
Running current (Heating) A 4.5/4.3/4.1
Inrush current A 4.5/4.3/4.1
COP Cooling: 4.03 Heating: 3.66
Cooling Sound level Hi 36, Me 30, Lo 22 44
Noise level Power level dB 52 58
Heating Sound level Hi 36, Me 33, Lo 26 47
Power level 54 62
Exterior dimensions
Height ×Width ×Depth mm 268 ×790 ×199 540 ×780 ×290
Color Fine snow Stucco white
Net weight kg 8.5 35
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 0.9 (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 38 24
(Cooling) 7.6 30
Air flow (at High) (Heating) CMM 8.7 23
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), 3D AUTO (Green)
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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)
Optional parts Interface kit
Notes (1) The data are measured at the following conditions.
Model SRK25ZG-S (Indoor unit)
SRC25ZG-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.)
(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold separately)
can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.
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)

-
4
-
Item
Model SRK35ZG-S SRC35ZG-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 1.05 (0.1~1.22)
Running current (Cooling) A 4.9/4.7/4.5
Heating input kW 1.14 (0.09~1.32)
Running current (Heating) A 5.3/5.1/4.9
Inrush current A 5.3/5.1/4.9
COP Cooling: 3.33 Heating: 3.68
Cooling Sound level Hi 40, Me 32, Lo 23 48
Noise level Power level dB 56 62
Heating Sound level Hi 41, Me 36, Lo 27 50
Power level 59 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 –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 1.1 (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 38 24
(Cooling) 8.5 30
Air flow (at High) (Heating) CMM 10.8 33
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), 3D AUTO (Green)
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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)
Optional parts Interface kit
Notes (1) The data are measured at the following conditions.
Model SRK35ZG-S (Indoor unit)
SRC35ZG-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.)
(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold
separately) can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.
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)

-
5
-
Model SRK50ZG-S (Indoor unit)
SRC50ZG-S (Outdoor unit)
Item
Model SRK50ZG-S SRC50ZG-S
Cooling capacity(1) W 5000 (600~5300)
Heating capacity(1) W 5800 (600~7900)
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 1.66 (0.12~2.1)
Running current (Cooling) A 7.6/7.3/7.0
Heating input kW 1.70 (0.11~2.71)
Running current (Heating) A 7.9/7.5/7.2
Inrush current A 7.9/7.5/7.2
COP Cooling: 3.01 Heating: 3.41
Cooling Sound level Hi 47, Me 42, Lo 26 48
Noise level Power level dB 61 61
Heating Sound level Hi 48, Me 40, Lo 34 50
Power level 62 64
Exterior dimensions
Height ×Width ×Depth mm 268 ×790 ×199 640 ×850 ×290
Color Fine snow Stucco white
Net weight kg 8.5 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 38 34
(Cooling) 11.5 42
Air flow (at High) (Heating) CMM 13.0 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), 3D AUTO (Green)
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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)
Optional parts Interface kit
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.
(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold
separately) can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.
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)

-
6
-
2.2 Range of usage & limitations
2.3 Exterior dimensions
(1) Indoor unit
Models SRK20ZG-S, 25ZG-S, 35ZG-S, 50ZG-S
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length Max. 15m
SRK20ZG-S, 25ZG-S, 35ZG-S SRK50ZG-S
Cooling operation : Approximately 18 to 32˚C
Heating operation : Approximately 15 to 30˚C
Cooling operation : Approximately -15 to 46˚C
Heating operation : Approximately -15 to 21˚C
Power source voltage Rating ±10%
Voltage at starting Min. 85% of rating
Frequency of ON-OFF cycle Max. 7 times/h
(Inching prevention 5 minutes)
Max. 4 times/h
(Inching prevention 10 minutes)
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)
Max. 25m
Max. 15m (Outdoor unit is higher)
Max. 15m (Outdoor unit is lower)
Item
Models
Unit: mm
Piping hole (ø65)
( )
Piping hole (ø65)
53.5
380.6
Pipng for Liquid 448.6 (ø6.35)
20, 25, 35 : ø9.52
50 : 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
→

-
7
-
Drain holes
286.4
12
50
290
49.6 43.5
850
203.1 510 136.9
476
2-16×12
314 12
328
Terminal block
Service valve (Liquid)
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 SRC50ZG-S
Unit: mm
(2) Outdoor unit
Models SRC20ZG-S, 25ZG-S, 35ZG-S
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 ø9.52 (3/8'')
Terminal block