Mitsubishi Heavy Industries SRK20ZIX-S User manual

SERVICE MANUAL
Manual No. '09 •SRK/SRF - SM - 082
INVERTER WALL MOUNTED TYPE
AND FLOOR STANDING TYPE
ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
Wall mounted type
SRK20ZIX-S
25ZIX-S
35ZIX-S
50ZIX-S
60ZIX-S
Floor standing type
SRF25ZIX-S
35ZIX-S
50ZIX-S
updated 25,May,2009

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1
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TABLE OF CONTENTS
1. WALL MOUNTED TYPE(SRK) .................................................................2
2. FLOOR STANDING TYPE(SRF) ............................................................45
3. MAINTENANCE DATA ...........................................................................69
3.1 Troubleshooting procedures for electrical equipment.................69
3.2 Servicing .........................................................................................90
4. REFRIGERANT PIPING INSTALLATION / SERVICING MANUAL
FOR AIR CONDITIONERS USING R410A.............................................91
4.1 Outline .............................................................................................91
4.2 Refrigerant piping installation .......................................................92
4.3 Installation, removal and servicing ...............................................98
4.4 Refrigerant recovery ....................................................................103

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2
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1. WALL MOUNTED TYPE(SRK)
CONTENTS
1.1 Electrical wiring ....................................................................................3
1.2 Piping system .......................................................................................6
1.3 Noise level .............................................................................................7
1.4 Sensible heat capacity .......................................................................12
1.5 Application data ..................................................................................14
1.5.1 Installation of indoor unit ............................................................14
1.5.2 Installation of outdoor unit ..........................................................18
1.6 Outline of operation control by microcomputer ..............................33
CONTENTS
1 RANGE OF USAGE & LIMITATIONS .................................................. 1
2 INDOOR UNIT ....................................................................................... 3
2.1 Wall mounted type (SRK) ............................................................ 3
(1) Specifications ........................................................................... 3
(2) Exterior dimensions .................................................................. 8
(3) Electrical wiring ......................................................................... 9
2.2 Floor standing type (SRF) ........................................................... 10
(1) Specifications ...........................................................................10
(2) Exterior dimensions ..................................................................13
(3) Electrical wiring ........................................................................14
(1) Exterior dimensions ..................................................................15
(2) Electrical wiring .........................................................................17
3 OUTDOOR UNIT ...................................................................................15
Series code
Inverter type
Product capacity
Wall mounted type
Split type room air-conditioner
■
 How to read the model name
Example : SR K 50 Z IX - S

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3
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1.1 Electrical wiring
(1) Indoor unit Models SRK20ZIX-S, 25ZIX-S, 35ZIX-S, 50ZIX-S, 60ZIX-S
RWA000Z215
250V
F
G
3.15A
S／N
Va
CNU
CNS
INTERFACE KIT
SC-BIKN-E
CNG
CNE
DISPLAY
WIRELESS RECEIVER
J
CNF
U
M
HEAT
1
3
4
5
6
BACK-UP SW
5
2
12
EXCHANGER
L
Th1 BOARD
CIRCUIT
PRINTED
LS
CNY
CNX2
CNX1
M
M
M
M
M
5
5
5
5
5
5
5
5
5 5 IM
RD
WH RD
WH
BK
BL
Y
Y／G
BK
t
Th21
Th22
Th3
LM1
LM2
SM1
SM2
FMI
DS
t
t
TO OUTDOOR UNIT
HEAT
EXCHANGER
1
2／N
3
POWER WIRES
SIGNAL WIRE
12/N
3
Power source
1 phase 220 - 240 V 50Hz
T
Color Marks
Blue
BlackBK
Red
BL
RD
WhiteWH
Yellow／Green Y／G
YellowY
ColorMark
Heat exch. sensor
Humidity sensor （50,60 only）
Fan motor
Room temp. sensor
Flap motor
Th1
Th21,2
Th3
Diode stackDS
FuseF
Connector CNE-CNY
FMI
Terminal blockT
Louver motor
LM1,2
SM1,2
Limit switchLS
Inlet motor
IM
Description
Item
VaristorVa

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4
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(2) Outdoor unit Models SRC20ZIX-S, 25ZIX-S, 35ZIX-S
RWC000Z213
Color
RD
Mark
OrangeOR
Yellow／Green Y／G
BlackBK
YellowY
WhiteWH
Red
DescriptionItem
Connector
CNEEV～20S
Electric expansion valve（coil）
EEV
Fan motor
FMo
Reactor
L
Terminal block
T
Compressor motor
CM
Solenoid valve for 4 way valve
20S
Heat exchanger sensor（outdoor unit）
TH1
Outdoor air temp.sensor
TH2
TH3 Discharge pipe temp.sensor
20
Model
Power cable, indoor-outdoor connecting wires
The specifications shown in the above table are for units without heaters. For units with heaters, refer
to the installation instructions or the construction instructions of the indoor unit.
Switchgear of Circuit breaker capacity which is calculated from MAX. over current should be chosen
along the regulations in each country.
The cable specifications are based on the assumption that a metal or plastic conduit is used with no
more than three cables contained in a conduit and a voltage drop is 2%. For an installation falling
outside of these conditions, please follow the internal cabling regulations. Adapt it to the regulation
in effect in each country.
25 8 2.0 32 φ1.6mm x 3 φ1.6mm
35
3
12
[ ]
N
POWER SOURCE 1～220ｰ240V 50Hz／1～220V 60Hz
（BK）
C-2
G1
（RD）
（Y／G）
S.IN （WH）
TERMINAL
R.IN
（BK）
（WH）
（RD）
PWB ASSY
250V 20A
F2
F3 250V 1A
F4
250V 10A
F1
250V 2A
CIRCUIT
PAM
SWITCHING POWER
CIRCUIT
NW
NV
NU
P
W
V
U
TRANSISTOR
POWER
W
V
U
FILTER
NOISE
CN20S CNTH CNEEV
CNFAN M
M
3～
250V 15A
L
（Y／G）
N
1
3
2
T1 T2
（OR）
（Y）
BLOCK
M
t゜
20S
TH1 TH2 TH3 EEV
FMo
CM
t゜ t゜
t゜
T
L
TO INDOOR UNIT
POWER WIRES
SIGNAL WIRE
MAX running current Power cable size
（mm ）
（A）
Power cable length
（m）
indoor-outdoor
wire size x number
Earth wire size
（mm）
2

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5
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Models SRC50ZIX-S, 60ZIX-S
RWC000Z214
Color
RD
Mark
OrangeOR
Yellow／Green Y／G
BlackBK
BrownBR
YellowY
WhiteWH
Red
DescriptionItem
Connector
CNEEV～20S
Electric expansion valve（coil）
EEV
Fan motor
FMo
Reactor
L
Terminal block
T1,2
Compressor motor
CM
Solenoid valve for 4 way valve
20S
Heat exchanger sensor（outdoor unit）
TH1
Outdoor air temp.sensor
TH2
TH3 Discharge pipe temp.sensor
POWER SOURCE 1～220ｰ240V 50Hz／1～220V 60Hz
Model
Power cable, indoor-outdoor connecting wires
The specifications shown in the above table are for units without heaters. For units with heaters, refer
to the installation instructions or the construction instructions of the indoor unit.
Switchgear of Circuit breaker capacity which is calculated from MAX. over current should be chosen
along the regulations in each country.
The cable specifications are based on the assumption that a metal or plastic conduit is used with no
more than three cables contained in a conduit and a voltage drop is 2%. For an installation falling
outside of these conditions, please follow the internal cabling regulations. Adapt it to the regulation
in effect in each country.
14 2.0 18 φ1.6mm x 3 φ1.6mm
50
3
12
[ ]
N
60
M
T2
T1
S（BK）
（WH）
（RD）
V
W
U
PWB ASSY （MAIN）
M
M
R
TRANSISTOR
POWER
CIRCUIT
SWITCHING POWER
250V 2A
F1
250V 20A
F2
F3 250V 1A
W
V
U
P
NU
NV
NW
CNTH CNEEV
CNFAN
t゜
3～
ACTIVE
FILTER
UNIT
250V 20A
F8
（OR） （Y）
S-2
t゜ t゜
（BK）
（WH）
（WH）
（BK）
PWB ASSY （SUB）
S-1
CNSUB
CNMAIN
250V 10A
F10
S
R
R
（BK）
（WH）
G1
（Y／G）
（BR）
IN
IN
OUT
S
R
O
O
N
L250V 20A
FUSE
2
1
N
3
（Y／G）
（Y／G）
CN20S
C-2
（RD）
20S
（RD）
T1
T2
TERMINAL
BLOCK
TH1 TH2 TH3 EEV
FMo
CM
BLOCK
TERMINAL
（WH）
TO INDOOR UNIT
POWER WIRES
SIGNAL WIRE
L
MAX running current Power cable size
（mm ）
（A）
Power cable length
（m）
indoor-outdoor
wire size x number
Earth wire size
（mm）
2

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6
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1.2 Piping system
Model SRK20ZIX-S, 25ZIX-S, 35ZIX-S
Heat
exchanger
sensor
(Th22)
4way valve
Service valve
( Gas )
Models SRK50ZIX-S,60ZIX-S
Models SRK20ZIX-S,25ZIX-S,35ZIX-S
Indoor unit Outdoor unit
Indoor unit Outdoor unit
Flare
connection
Flare connection
Liquid
pipe
(φ6.35)
Gas pipie
(φ9.52)
Service valve
Heat
exchanger
Heat
exchanger
sensor Electronic
expansion valve
(Liquid)
Strainer Strainer
Capillary tube
Outdoor air
temp. sensor
Muffler
Muffler
Compressor
Accumlator
Discharge pipe
temp. sensor
Cooling cycle
Heating cycle
Cooling cycle
Heating cycle
Check joint
4way valve
Service valve
Heat
exchanger
sensor
(Th22)
(TH3)
Room temp.
sensor
(Th1)
(Th21)
( Gas )(TH2)
Heat
exchanger
sensor
(TH1)
(EEV)
Capillary tube
Heat
exchanger
Humidity
sensor
(Th3) Heat
exchanger
sensor
(Th21)
Heat
exchanger
Flare
connection
Gas pipie
(φ12.7)
Flare connection
Liquid
pipe
(φ6.35)
Service valve
(Liquid)
Muffler
Muffler
Compressor
Discharge pipe
temp. sensor
(TH3)
Outdoor air
temp. sensor
(TH2)
Heat
exchanger
sensor
(TH1)
Capillary tube
Heat
exchanger
Electronic
expansion valve
Capillary tube
(EEV)
Check joint
Strainer
Room temp.
sensor
(Th1)
Model SRK50ZIX-S, 60ZIX-S

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7
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(Indoor Unit)
Model SRK20ZIX-S
Noise
Level
Cooling 39 dB(A)
Heating 38 dB(A) × ...... Cooling, Heating
1.3 Noise level
Model SRK20ZIX-S
10
20
30
40
50
60
70
63 125 250 500 1000 2000 4000 8000
Mid Octave Band frequency (Hz)
Sound Pressure Level (dB)
(standard 2×10-5 Pa)
10
20
30
40
50
60
70
N50
N30
N40
N60
N70
N2 0
(Outdoor Unit)
Model SRC20ZIX-S
Noise
Level
Cooling 47 dB(A)
Heating 47 dB(A)
10
20
30
40
50
60
70
63 125 250 500 1000 2000 4000 8000
Mid Octave Band frequency (Hz)
Sound Pressure Level (dB)
(standard 2×10-5 Pa)
10
20
30
40
50
60
70
N50
N30
N40
N60
N70
N20
× ...... Cooling, Heating
Condition ISO-T1,JIS C9612

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8
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(Indoor Unit)
Model SRK25ZIX-S
Noise
Level
Cooling 41 dB(A)
Heating 41 dB(A)
× ...... Cooling, Heating
Model SRK25ZIX-S
10
20
30
40
50
60
70
63 125 250 500 1000 2000 4000 8000
Mid Octave Band frequency (Hz)
Sound Pressure Level (dB)
(standard 2×10-5 Pa)
10
20
30
40
50
60
70
N50
N30
N40
N60
N70
N20
(Outdoor Unit)
Model SRC25ZIX-S
Noise
Level
Cooling 47 dB(A)
Heating 47 dB(A)
10
20
30
40
50
60
70
63 125 250 500 1000 2000 4000 8000
Mid Octave Band frequency (Hz)
Sound Pressure Level (dB)
(standard 2×10-5 Pa)
10
20
30
40
50
60
70
N50
N40
N60
N70
N20
N30
× ...... Cooling, Heating
Condition ISO-T1,JIS C9612

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9
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(Indoor Unit)
Model SRK35ZIX-S
Noise
Level
Cooling 43 dB(A)
Heating 42 dB(A)
× ...... Cooling, Heating
Model SRK35ZIX-S
(Outdoor Unit)
Model SRC35ZIX-S
Noise
Level
Cooling 50 dB(A)
Heating 50 dB(A)
× ...... Cooling, Heating
Condition ISO-T1,JIS C9612
10
20
30
40
50
60
70
63 125 250 500 1000 2000 4000 8000
Mid Octave Band frequency (Hz)
Sound Pressure Level (dB)
(standard 2×10-5 Pa)
10
20
30
40
50
60
70
N50
N30
N40
N60
N70
N20
10
20
30
40
50
60
70
63 125 250 500 1000 2000 4000 8000
Mid Octave Band frequency (Hz)
Sound Pressure Level (dB)
(standard 2×10-5 Pa)
10
20
30
40
50
60
70
N50
N30
N40
N60
N70
N20