Mitsubishi Electric PEFY-P15VMS1(L)-E Operating manual

Air-Conditioners
TECHNICAL & SERVICE MANUAL
Models PEFY-P15VMS1(L)-E, PEFY-P40VMS1(L)-E
PEFY-P20VMS1(L)-E, PEFY-P50VMS1(L)-E
PEFY-P25VMS1(L)-E, PEFY-P63VMS1(L)-E
PEFY-P32VMS1(L)-E
For use with R410A, R407C, & R22
2007

ii
HWE07120 GB
Safety Precautions
Read before installation and performing electrical work
Symbol explanations
Thoroughly read the following safety precautions prior to installation.
Observe these safety precautions for your safety.
This equipment may have adverse effects on the equipment on the same power supply system.
Contact the local power authority before connecting to the system.
WARNING
This symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or death.
CAUTION
This symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or dam-
age to the unit.
Indicates an action that must be avoided.
Indicates important instructions.
Indicates a parts that requires grounding.
Indicates that caution must be taken with rotating parts. (This symbol is on the main unit label.) <Color: Yellow>
Indicates that the parts that are marked with this symbol pose a risk of electric shock. (This symbol is on the main
unit label.) <Color: Yellow>
WARNING
Carefully read the labels affixed to the main unit.
WARNING
Ask your dealer or a qualified technician to install the unit.
Improper installation by the user may result in water leak-
age, electric shock, or fire.
Properly install the unit on a surface that can withstand its
weight.
Unit installed on an unstable surface may fall and cause in-
jury.
Only use specified cables. Securely connect each cable so
that the terminals do not carry the weight of the cable.
Improperly connected cables may produce heat and start a
fire.
Take appropriate safety measures against wind gusts and
earthquakes to prevent the unit from toppling over.
Improper installation may cause the unit to topple over and
cause injury or damage to the unit.
Onlyuseaccessories(i.e.,aircleaners,humidifiers,electric
heaters) recommended by Mitsubishi Electric.
Do not make any modifications or alterations to the unit.
Consult your dealer for repair.
Improper repair may result in water leakage, electric shock,
or fire.
Do not touch the heat exchanger fins with bare hands.
The fins are sharp and pose a risk of cuts.
In the event of a refrigerant leak, thoroughly ventilate the
room.
If gaseous refrigerant leaks out and comes in contact with
an open flame, toxic gases will be generated.
Properly install the unit according to the instructions in the
Installation Manual.
Improper installation may result in water leakage, electric
shock, or fire.
Have all electrical work performed by an authorized electri-
cian according to the local regulations and the instructions
in this manual. Use a dedicated circuit.
Insufficient power supply capacity or improper installation
of the unit may result in malfunctions of the unit, electric
shock, or fire.

ii
HWE07120 GB
Precautions for handling units for use with R410A
WARNING
Keep electrical parts away from water.
Wet electrical parts pose a risk of electric shock, smoke, or
fire.
Securely attach the control box cover.
If the cover is not installed properly, dust or water may infil-
trate and pose a risk of electric shock, smoke, or fire.
Only use the type of refrigerant that is indicated on the unit
when installing or relocating the unit.
Infiltrationofany other typesofrefrigerant or airinto the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.
When installing the unit in a small space, take appropriate
precautions to prevent leaked refrigerant from reaching the
limiting concentration.
Leaked refrigerant gas will displace oxygen and may cause
oxygen starvation. Consult your dealer before installing the
unit.
Consult your dealer or a qualified technician when moving
or reinstalling the unit.
Improper installation may result in water leakage, electric
shock, or fire.
After completing the service work, check for a refrigerant
leak.
If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, toxic gases will be gener-
ated.
Do not try to defeat the safety features of the unit.
Forced operation of the pressure switch or the temperature
switch by defeating the safety features for thesedevices, or
the use of accessories other than the ones that are recom-
mended by Mitsubishi Electric may result in smoke, fire, or
explosion.
Consult your dealer for proper disposal method.
Do not use a leak detection additive.
CAUTION
Do not use the existing refrigerant piping.
A large amount of chlorine that may be contained in the re-
sidual refrigerant and refrigerator oil in the existing piping
may cause the refrigerator oil in the new unit to deteriorate.
Use refrigerant piping materials made of phosphorus deox-
idized copper. Keep the inner and outer surfaces of the
pipesclean andfree of such contaminantsas sulfur,oxides,
dust, dirt, shaving particles, oil, and moisture.
Contaminants in the refrigerant piping may cause the refrig-
erator oil to deteriorate.
Store the piping materials indoors, and keep both ends of
the pipes sealed until immediately before brazing. (Keep el-
bows and other joints wrapped in plastic.)
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerator oil to deteriorate or cause the
compressor to malfunction.
Use a small amount of ester oil, ether oil, or alkyl benzene
to coat flares and flanges.
Infiltration of a large amount of mineral oil may cause the re-
frigerator oil to deteriorate.
Charge the system with refrigerant in the liquid phase.
If gaseous refrigerant is drawn out of the cylinder first, the
composition of the remaining refrigerant in the cylinder will
change and become unsuitable for use.
Only use R410A.
The use of other types of refrigerant that contain chloride
may cause the refrigerator oil to deteriorate.
Use a vacuum pump with a check valve.
If a vacuum pump that is not equipped with a check valve is
used, the vacuum pump oil may flow into the refrigerant cy-
cle and cause the refrigerator oil to deteriorate.
Prepare tools for exclusive use with R 410A. Do not use the
following tools if they have been used with the conventional
refrigerant: gauge manifold, charging hose, gas leak detec-
tor, check valve, refrigerant charge base, vacuum gauge,
and refrigerant recovery equipment.
If the refrigerant or the refrigerator oil that may be left on these
tools are mixed in with R410A, it may cause the refrigerator oil
in the new system to deteriorate.
Infiltration of water may cause the refrigerator oil to deteriorate.
Leak detectors for conventional refrigerants will not detect an
R410A leak because R410A is free of chlorine.
Do not use a charging cylinder.
If a charging cylinder is used, thecomposition of the refrigerant
in the cylinder will change and become unsuitable for use.
Exercise special care when handling tools for use with R410A.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerator oil to deteriorate.

CONTENTS
HWE07120 GB
I Features
[1] Features....................................................................................................................................1
II Components and Functions
[1] Components and Functions......................................................................................................2
III Specfications
[1] Specifications............................................................................................................................4
1.Specfications .......................................................................................................................... 4
2.Electrical component specifications........................................................................................ 6
IV Outlines and Dimensions
[1] Outlines and Dimensions.......................................................................................................... 7
V Wiring Diagram
[1] Wiring Diagram......................................................................................................................... 9
VI Refrigerant System Diagram
[1] Refrigerant system diagram.................................................................................................... 11
VII Troubleshooting
[1] Troubleshooting...................................................................................................................... 12
1.Check methods..................................................................................................................... 12
2.DC fan motor (fan motor/indoor control board)..................................................................... 16
3.Address switch setting..........................................................................................................17
4.Voltage test points on the control board............................................................................... 18
5.Dipswitch setting (Factory setting)........................................................................................19
VIII Disassembly Procedure
[1] Disassembly Procedure.......................................................................................................... 22
1.Control box ........................................................................................................................... 22
2.Thermistor (Intake air) ..........................................................................................................23
3.Drainpan...............................................................................................................................24
4.Thermistor (Gas pipe) (Liquid pipe)...................................................................................... 25
5.Fan and fan motor ................................................................................................................ 26
6.Bearing ................................................................................................................................. 27
7.Heat exchanger ....................................................................................................................28

HWE07120 GB

[ I Features ]
- 1 -
HWE07120 GB
I Features
[1] Features
Model Cooling capacity/Heating capacity
kW
PEFY-P15VMS1(L)-E 1.7/1.9
PEFY-P20VMS1(L)-E 2.2/2.5
PEFY-P25VMS1(L)-E 2.8/3.2
PEFY-P32VMS1(L)-E 3.6/4.0
PEFY-P40VMS1(L)-E 4.5/5.0
PEFY-P50VMS1(L)-E 5.6/6.3
PEFY-P63VMS1(L)-E 7.1/8.0

[ II Components and Functions ]
- 2 -
HWE07120 GB
II Components and Functions
[1] Components and Functions
1. Indoor (Main) Unit
2. Remote Controller
[PAR-21MAA]
Once the operation mode is selected, the unit will remain in the selected mode until changed.
(1) Remote Controller Buttons
Keep the remote controller out of direct sunlight to ensure accurate measurement of room temperature.
The thermistor at the lower right-hand section of the remote controller must be free from obstructions to ensure accurate mea-
surement of room temperature.
(A) Air
1 [Set Temperature] Button 7 [Vane Control] Button
2 [Timer Menu] Button 8 [Ventilation] Button
[Monitor/Set] Button [Operation] Button
3 [Mode] Button 9 [Check/Clear] Button
[Back] Button 10 [Test Run] Button
4 [Timer On/Off] Button 11 [Filter] Button
[Set Day] Button [ ] Button
5 [Louver] Button 12 [ON/OFF] Button
[Operation] Button 13 Position of built-in room thermistor
6 [Fan Speed] Button 14 [Set Time] Button
(A)
(A)

[ II Components and Functions ]
- 3 -
HWE07120 GB
(2) Remote Controller Display
A Current time/Timer time I Louver swing
B Centralized control indicator J Ventilation
C Timer OFF indicator K Filter sign
D Timer mode L Sensor position
E Operation mode display: COOL, DRY, AUTO,
FAN, HEAT M Room temperature
F Function Lock indicator N Vane setting
G Preset temperature O Fan speed
H Power indicator

[ III Specfications ]
- 4 -
HWE07120 GB
III Specfications
[1] Specifications
1. Specfications
*1 <Cooling> Indoor temperature: 27°CDB/19°CWB (81°FDB/66°FWB Outdoor temperature: 35°CDB (95°FDB)
<Heating> Indoor temperature: 20°CDB (68°FDB) Outdoor temperature: 7°CDB/6°CWB (45°FDB/43°FWB)
*2 Figures in the parentheses indicate the weight of drainpump-less units (L).
Model PEFY-
P15VMS1(L)-E PEFY- P20VMS1(L)-E PEFY- P25VMS1(L)-E PEFY- P32VMS1(L)-E
Power supply Voltage V 220-240
Frequency Hz 50/60
Cooling capacity *1 kW 1.7 2.2 2.8 3.6
Heating capacity *1 kW 1.9 2.5 3.2 4.0
Power consumption Cooling kW 0.05/0.05 0.05/0.05 0.06/0.06 0.07/0.07
Heating kW 0.03/0.03 0.03/0.03 0.04/0.04 0.05/0.05
Current consumption Cooling A 0.42/0.42 0.47/0.47 0.50/0.50 0.50/0.50
Heating A 0.31/0.31 0.36/0.36 0.39/0.39 0.39/0.39
External finish (Munsel No.) Galvanized
Dimensions Height mm 200
Width mm 700
Depth mm 700
Net weight *2 kg 19(18) 20(19)
Heat exchanger Cross fin (Aluminium fin and cupper tube)
Fan Type Sirocco fan x 2
Airflow rate
(Low-Mid-High) m3/min 5.0-6.0-7.0 5.5-6.5-8.0 5.5-7.0-9.0 6.0-8.0-10.0
External static
pressure Pa 5/15/35/50 5/15/35/50 5/15/35/50 5/15/35/50
Motor Output kW 0.096
Air filter PP Honeycomb fabric (washable)
Refrigerant pipe di-
mensions (R410A) Gas (Brazed connection) mm [in.] ø12.7 [ø1/2]
Liquid (Brazed
connection) mm [in.] ø6.35 [ø1/4]
Refrigerant pipe di-
mensions (R22) Gas (Brazed connection) mm [in.] ø12.7 [ø1/2]
Liquid (Brazed
connection) mm [in.] ø6.35 [ø1/4]
Drain pipe dimensions mm
[in.] O.D. 32 [1-9/32]
Operating noise
(Low-Mid-High) 5Pa dB (A) 22-24-26 22-25-28 23-25-29 24-27-30
15Pa 22-24-28 22-25-29 24-26-30 24-27-32
35Pa 24-26-29 25-27-30 25-28-31 25-28-33
50Pa 24-27-30 25-28-32 25-29-33 25-29-34

[ III Specfications ]
- 5 -
HWE07120 GB
*1 <Cooling> Indoor temperature: 27°CDB/19°CWB (81°FDB/66°FWB Outdoor temperature: 35°CDB (95°FDB)
<Heating> Indoor temperature: 20°CDB (68°FDB) Outdoor temperature: 7°CDB/6°CWB (45°FDB/43°FWB)
*2 Figures in the parentheses indicate the weight of drainpump-less units (L).
Model PEFY-P40VMS1(L)-E PEFY-P50VMS1(L)-E PEFY-P63VMS1(L)-E
Power supply Voltage V 220-240
Frequency Hz 50/60
Cooling capacity *1 kW 4.5 5.6 7.1
Heating capacity *1 kW 5.0 6.3 8.0
Power consumption Cooling kW 0.07/0.07 0.09/0.09 0.09/0.09
Heating kW 0.05/0.05 0.07/0.07 0.07/0.07
Current consumption Cooling A 0.56/0.56 0.67/0.67 0.72/0.72
Heating A 0.45/0.45 0.56/0.56 0.61/0.61
External finish (Munsel No.) Galvanized
Dimensions Height mm 200
Width mm 900 1100
Depth mm 700
Net weight *2 kg 24(23) 28(27)
Heat exchanger Cross fin (Aluminium fin and cupper tube)
Fan Type Sirocco fan x 3 Sirocco fan x 4
Airflow rate
(Low-Mid-High) m3/min 8.0-9.5-11.0 9.5-11.0-13.0 12.0-14.0-16.5
External static
pressure Pa 5/15/35/50 5/15/35/50 5/15/35/50
Motor Output kW 0.096
Air filter PP Honeycomb fabric (washable)
Refrigerant pipe di-
mensions (R410A) Gas (Brazed connection) mm [in.] ø12.7 [ø1/2] ø15.88 [ø5/8]
Liquid (Brazed
connection) mm [in.] ø6.35 [ø1/4] ø9.52[ø3/8]
Refrigerant pipe di-
mensions (R22) Gas (Brazed connection) mm [in.] ø12.7 [ø1/2] ø15.88 [ø5/8]
Liquid (Brazed
connection) mm [in.] ø6.35 [ø1/4] ø9.52[ø3/8]
Drain pipe dimensions mm
[in.] O.D. 32 [1-9/32]
Operating noise
(Low-Mid-High) 5Pa dB (A) 26-29-32 29-31-34 29-32-35
15Pa 28-30-33 30-32-35 30-33-36
35Pa 30-32-35 31-34-37 31-35-39
50Pa 31-33-36 32-34-38 32-36-40

[ III Specfications ]
- 6 -
HWE07120 GB
2. Electrical component specifications
Component Sym-
bol PEFY- P15VMS1(L)-E PEFY- P20VMS1(L)-E PEFY- P25VMS1(L)-E PEFY- P32VMS1(L)-E
Room temperature
thermistor TH21 Resistance 0°C/15k , 10°C/9.6k , 20°C/6.3k , 25°C/5.4k , 30°C/4.3k , 40°C/3.0k
Liquid pipe thermistor TH22 Resistance 0°C/15k , 10°C/9.6k , 20°C/6.3k , 25°C/5.4k , 30°C/4.3k , 40°C/3.0k
Gas pipe thermistor TH23 Resistance 0°C/15k , 10°C/9.6k , 20°C/6.3k , 25°C/5.4k , 30°C/4.3k , 40°C/3.0k
Fuse FUSE 250V 6.3A
Fan motor 8-pole, Output 96W SIC-70CW-D8114-1
Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3.2 (0~2000 pulse)
Power supply terminal
block TB2 (L, N, ) 330V 30A
Transmission terminal
block TB5 TB15 (1, 2), (M1, M2, S) 250V 20A
Drain float switch DS Open/short detection
Initial contact resistance 500 m or less
Component Sym-
bol PEFY-P40VMS1(L)-E PEFY-P50VMS1(L)-E PEFY-P63VMS1(L)-E
Room temperature
thermistor TH21 Resistance 0°C/15k , 10°C/9.6k , 20°C/6.3k , 25°C/5.4k , 30°C/4.3k , 40°C/3.0k
Liquid pipe thermistor TH22 Resistance 0°C/15k , 10°C/9.6k , 20°C/6.3k , 25°C/5.4k , 30°C/4.3k , 40°C/3.0k
Gas pipe thermistor TH23 Resistance 0°C/15k , 10°C/9.6k , 20°C/6.3k , 25°C/5.4k , 30°C/4.3k , 40°C/3.0k
Fuse FUSE 250V 6.3A
Fan motor 8-pole, Output 96W SIC-70CW-D896-2
Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3.2 (0~2000 pulse)
Power supply terminal
block TB2 (L, N, ) 330V 30A
Transmission terminal
block TB5 TB15 (1, 2), (M1, M2, S) 250V 20A
Drain float switch DS Open/short detection
Initial contact resistance 500 m or less

[ IV Outlines and Dimensions ]
- 7 -
HWE07120 GB
IV Outlines and Dimensions
[1] Outlines and Dimensions
1. PEFY-P15, 20, 25, 32, 40, 50, 63VMS1-E
(A) Space required for service and maintenance.
(B) Provide an access door for maintenance at the bottom.
Note 1 Use M10 suspension bolts. (not supplied)
2 Provide an access door for maintenance at the bottom.
3 The dimensions in the table are those of the PEFY-P40, 50VMS1-E models, which have 3 fans. The PEFY-
P15~32VMS1-E model have 2 fans. The PEFY-P63VMS1-E model has 4 fans.
4 Toconnect an intakeduct, uninstallthe air filter on the unit, andinstallalocally procuredair filteron the intake
duct on the intake side.
2 x E- 2.9
6.3512.7
PEFY-P50VMS1-E 900 952 998 860 9 800 1000 860 7 700 20
24 16
L
900 500
K
9 5
J
1060
660
H
8006007660798700 752
Knockout hole 27 (Transmission wiring)
Knockout hole 27
(Power source wiring)
G
1200
F
1000
E
11
D
1060
C
1100
B
1152
PEFY-P15,20,25,32VMS1-E PEFY-P40VMS1-E PEFY-P63VMS1-E
Model A
1198
Gas pipe Liquid pipe
*1 *2 *1
*2
12.7
15.88 6.35
9.52
9.5215.88
L- 2.9
2 x 2- 2.9
Control box
Air filter
Suspension bolt hole 4-14 x 30 Slot
Terminal block(Power source)
Refrigerant piping
brazing connection (liquid)
2
Refrigerant piping
brazing connection (gas)
1
12
Drain pipe(O.D. 32)
(Spontaneous draining)
Terminal block(Transmission)
Drainpump
Drain pipe
(O.D. 32)
Air inlet
Air outlet
*1:R410A outdoor unit *2:R407C,R22 outdoor unit
<accessory>
5mm
Drain hose (I.D. 32)
(Actual length)
Note2
Access door
(A)
Access door
Ceiling surface
(B)
450
37
200
H20
157.520 1003712
12 88100 x J=K
100
88
777
50
50~150
50
G450
More than 300
Less than 550mm
Less than 300mm
175mm
10
49
25
More than 20mm
More than 10mm
170
102
48
270
70116
150(Duct) 23
100 25
700
67723
10 270
C
B (Suspension bolt pitch)23 A90
625(Suspension bolt pitch)
100
57
D (Duct)
30 100 x (E-1)=F
100
20
15

[ IV Outlines and Dimensions ]
- 8 -
HWE07120 GB
2. PEFY-P15, 20, 25, 32, 40, 50, 63VMS1L-E
(A) Space required for service and maintenance.
(B) Provide an access door for maintenance at the bottom.
Note 1 Use M10 suspension bolts. (not supplied)
2 Provide an access door for maintenance at the bottom.
3 The dimensions in the table are those of the PEFY-P40, 50VMS1L-E models, which have 3 fans. The PEFY-
P15~32VMS1L-E model have 2 fans. The PEFY-P63VMS1L-E model has 4 fans.
4 Toconnect an intakeduct, uninstallthe air filter on theunit, andinstall alocally procuredair filter onthe intake
duct on the intake side.
12
6.3512.7
PEFY-P50VMS1L-E 900 952 998 860 9 800 1000 860 7 700 20
24 16
L
900 500
K
9 5
J
1060
660
H
8006007660798700 752
Knockout hole 27 (Transmission wiring)
Knockout hole 27
(Power source wiring)
G
1200
F
1000
E
11
D
1060
C
1100
B
1152
PEFY-P15,20,25,32VMS1L-E PEFY-P40VMS1L-E PEFY-P63VMS1L-E
Model A
1198
Gas pipe Liquid pipe
*1 *2 *1
*2
12.7
15.88 6.35
9.52
9.5215.88
L- 2.9
2 x 2- 2.9
2 x E- 2.9
Control box
Air filter
Suspension bolt hole 4-14 x 30 Slot
Terminal block(Power source)
Refrigerant piping
brazing connection (liquid)
2
Refrigerant piping
brazing connection (gas)
1
Drain pipe(O.D. 32)
(Spontaneous draining)
Terminal block(Transmission)
Air inlet
Air outlet
*1:R410A outdoor unit *2:R407C,R22 outdoor unit
Note2
Access door
Access door
Ceiling surface
450
37
200
H20
157.520 1003712
12 88100 x J=K
100
88
777
50
50~150
50
G 450
More than 300
10
49
25
More than 20mm
More than 10mm
170
102
270
70116
150(Duct) 23
100 25
700
67723 10
C
B (Suspension bolt pitch)23 A90
625(Suspension bolt pitch)
100
D (Duct)
30 100 x (E-1)=F
100
20
15
(A) (B)

[ V Wiring Diagram ]
- 9 -
HWE07120 GB
V Wiring Diagram
[1] Wiring Diagram
1. PEFY-P15, 20,25,32,40,50,63VMS1(L)-E
4231
8 7 6 5 4 3 2 1
4 3 2 1
1~
42311324 12 14567
6 5 3 1 4 3 2 1
13512132481324567
13
L1:only PEFY-P63VMS1(L)-E
INSIDE SECTION OF CONTROL BOX
(Connection No.)(10’s digit)(1’s digit)
A.B.
SW1
SWC TB5
TH22 TH21TH23 FS
TB15
MMM
M2M1 21
SW12 SW11 SW14
CN43
CN52
CN60
CN32
CN3A
CN81
CN51 CN41 CN44 CN4F
CN4F
CNMF L1
TB2
L N
CNP
CND
DSA
ZNR02
FUSE
ZNR01
CN20
CN82
SWA SWB
I.B.
Drainpump
LEV Fan motor
*FOR PEFY-P VMS1-E
*FOR PEFY-P VMS1L-E
*FOR PEFY-P VMS1-E
tt
U
DC310~340V
Rectify circuit
POWER SUPPLY ~220,230,240V 50,60Hz
TO NEXT INDOOR UNIT
FUSE (16A)
PULL BOX
BREAKER (16A)
X1
U
t
(Green)
(Blue)
(Red)
CN42 CN2M
CN90
CN27
SW3
SWE
OFF ON
SW4 SW2
LED2
LED1
(Red)
(Red)
(Red)
(Blue)
(Blue)
(Black)
S(SHIELD)
TO MA REMOTE CONTROLLER
TO OUTDOOR UNIT BC CONTROLLER REMOTE CONTROLLER
0 5
64
73
82
91
0 5
64
73
82
91 0
8
1F 2E 3D 4C 5B 6A 79

[ V Wiring Diagram ]
- 10 -
HWE07120 GB
Table.1 SYMBOL EXPLANATION
SYM-
BOL NAME SYM- BOL NAME SYM- BOL NAME
I.B. Indoor control board CN32 Connector (Remote switch) SW4
(I.B.) Switch (function setting)
A.B. Address board CN41 Connector (HA terminal-A) SWE
(I.B.) Connector (emergency opera- tion)
TB2 Power supply terminal block CN51 Connector (Centralized con-
trol) SW1 (A.B.) Switch (function setting)
TB5 Transmission terminal block CN52 Connector (Remote display) SW11
(A.B.) Switch(Forsettingthe1'sdigit in the address)
TB15 Transmission terminal block CN90 Connector (Wireless) SW12
(A.B.) Switch (For setting the 10's digit in the address)
FUSE Fuse AC 250V 6.3A FS Float switch SW14
(A.B.) Switch (connection No.set- ting)
ZNR01,
02 Varistor TH21 Thermistor (inlet air) SWA (A.B.) Switch (static pressure set- ting)
DSA Arrester TH22 Thermistor (liquid pipe) SWB
(A.B.) Switch (function setting)
X1 Aux. relay TH23 Thermistor (gas pipe) SWC
(A.B.) Switch (static pressure set- ting)
L1 AC reactor (Power factor im-
provement) SW2 (I.B.) Switch (capacity code setting)
CN27 Connector (Damper) SW3
(I.B.) Switch (function setting)
Note 1 Wiring to TB2, TB5, and TB15 indicated by the double-dashed lines is on-site work.
2 terminal block, connector.

[ VI Refrigerant System Diagram ]
- 11 -
HWE07120 GB
VI RefrigerantSystem Diagram
[1] Refrigerant system diagram
(A) Gas pipe thermistor TH23
(B) Gas pipe
(C) Liquid pipe
(D) Brazed connections
(E) Strainer (#100 mesh)
(F) Linear expansion valve
(G) Liquid pipe thermistor TH22
(H) Heat exchanger
(I) Room temperature thermistor TH21
(H)
(I)
(F)
(E)(E)
(C)
(G)
(A)
(D)
(B)
Capacity PEFY-P15, 20, 25, 32, 40VMS1(L)-E PEFY-P50VMS1(L)-E PEFY-P63VMS1(L)-E
Gas pipe ø12.7 [1/2] R410A: ø12.7 [1/2]
R22: ø15.88 [5/8] ø15.88 [5/8]
Liquid pipe ø6.35 [1/4] R410A: ø6.35 [1/4]
R22: ø9.52 [3/8] ø9.52 [3/8]

[ VII Troubleshooting ]
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HWE07120 GB
VII Troubleshooting
[1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 10°C - 30°C)
1) Thermistor characteristic graph
(2) Fan motor (CNMF)
Refer to the page on "DC fan motor (fan motor/indoor control board)."
(3) Linear expansion valve
Disconnect the connector, and measure the resistance between terminals with a tester.
Refer to the next page for details.
Normal Abnormal
4.3k - 9.6k Open or short
(Refer to the thermistor characteristic graph below.)
Low-temperature thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Drain sensor (DS)
Thermistor R0= 15 k 3%
Multiplier of B = 3480 k 2%
0°C 15k
10°C 9.6k
20°C 6.3k
25°C 5.2k
30°C 4.3k
40°C 3.0k
(A) Temperature (°C)
(B) Resistance (k )
Normal Abnormal
1-5 2-6 3-5 4-6 Open or short
White-Red Yellow-Brown Orange-Red Blue-Brown
200 k 10%
(A) Brown (D) Orange
(B) Red (E) Yellow
(C) Blue (F) White
Rt = 15 exp { 3480( ) }
1
273+t 1
273
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
(A)
(B)
1
2
3
4
5
6
LEV
(A)
(B)
(C)
(D)
(E)
(F)
CN60

[ VII Troubleshooting ]
- 13 -
HWE07120 GB
1) Summary of linear expansion valve (LEV) operation
The LEV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board.
The LEV position changes in response to the pulse signal.
Indoor control board and LEV connection
Pulse signal output and valve operation
The output pulse changes in the following order:
When the valve closes 1 -> 2 -> 3 -> 4 -> 1
When the valve opens 4 -> 3 -> 2 -> 1 -> 4
When the valve position remains the same, all output signals will be OFF.
If any output signal is missing or if the signal remains ON, the motor vibrates and makes clicking noise.
(A) Brown (F) White
(B) Red (G) Control board
(C) Blue (H) Connection (CN60)
(D) Orange (I) Drive circuit
(E) Yellow (J) Linear expansion valve
Phase
number Output pulse
1234
ø1 ON OFF OFF ON
ø2 ON ON OFF OFF
ø3 OFF ON ON OFF
ø4 OFF OFF ON ON
4
3
6
5
2
1
(G)
(H)
(I)
(J) (A)
(A)
(B)
(B)
(C)
(C)
(D)
(D) (E)
(E)
(F)
(F)
12VDC
M
4
6
2
3
5
1

[ VII Troubleshooting ]
- 14 -
HWE07120 GB
2) LEV operation
When the power is turned on, a pulse signal of 2200 pulses is output (valve closure signal), to bring the valve to position A.
When the valve is operating normally, it is free of vibration noise. If the valve locks or when it goes from point E to A in the
figure, it makes louder noise than would be heard when there is an open phase.
Check for abnormal sound/vibration by placing the metal tip of a screwdriver against the valve and the handle side against
your ear.
3) Troubleshooting
(a) Close
(b) Open
(c) Fully open valve (2000 pulses)
(d) No. of pulses
(e) Extra tightning (80 - 100 pulse)
(f) Valve opening degree
(f)
(a)
(b)
(e)
(d)
(c)
Symptom Checking Criteria Remedy
Circuit failure on
the microcomputer Disconnect the connectors on the control board, and connect LEDs to test the cir- cuit as shown below.
Pulse signals are output for 10 seconds when the main power is turned on. If there
are LEDs that do not light up at all or remain lit after the pulses are turned off, there
is a problem with the driving circuit.
Replace the indoor
control board if driv-
ing circuit failure is
detected.
Locked LEV The motor will idle and make small clicking noise if it is run while the LEV is locked.
If this clicking noise is heard both when the valve is fully closed and while it is being
opened, it indicates a problem.
Replace the LEV.
Disconnected or
shortedLEVmotor
coils
easure the resistance between the coils with a tester (red-white, red-orange,
brown-yellow, brown-blue). The normal range of resistance is 150 10% Replace the LEV.
6
5
4
3
2
1
1 k LED

[ VII Troubleshooting ]
- 15 -
HWE07120 GB
(4) Drain-up mechanism
Measure the resistance between the terminals with a tester.
(coil temperature 20°C)
(5) Drain float switch (CN4F)
Disconnect the connector, and measure the resistance between terminals with a tester.
Valve closure fail-
ure (leaky valve) To check the LEV on the indoor unit, check the indoor unit liquid pipe temperature thatappearson the operationmonitoronthe outdoorunit'smulticontrolboard while
operating the indoor unit in question in the FAN mode and the other indoor units in
the cooling mode.
Replace the LEV if
the amount of leak-
age is great.
(A) Termistor (TH21)
Normally, the LEV is fully closed while the unit is in the FAN mode. If the valve is
leaky, liquid pipe thermistor reading will be lower than normal. If it is significantly
lower than the inlet temperature on the remote controller, valve closure failure is
suspected. If the amount of leakage is insignificant, replacement of LEV is unnec-
essary unless it is causing a problem.
Misconnections of
connectors or con-
tact failure
Perform a visual check for disconnected connectors.
Perform a visual check of lead wire color. Disconnect the con- nectors on the con-
trol board and
perform a continuity
test.
Symptom Checking Criteria Remedy
(A)
LEV
Normal Abnormal
340 Open or short
(A) Moving part
(B) Switch
(C) Magnet
Position of the moving part Normal Abnormal
Up Short (any position but short)
Down Open (any position but open)
1
3
1
2
3
4
(A)
(A)
(B)
(C)