Mitsubishi Electric City Multi PEFY-WP20VMA-E Operating manual

AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Model name
PEFY-WP20VMA-E
PEFY-WP25VMA-E
PEFY-WP32VMA-E
PEFY-WP40VMA-E
PEFY-WP50VMA-E
2012

ޓޓ

ii
HWE1114A 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
Do not use refrigerant other than the type indicated in the
manuals provided with the unit and on the nameplate.
Doing so may cause the unit or pipes to burst, or result in
explosion or fire during use, during repair, or at the time of
disposal of the unit.
It may also be in violation of applicable laws.
MITSUBISHI ELECTRIC CORPORATION cannot be held
responsible for malfunctions or accidents resulting from the
use of the wrong type of refrigerant.
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.
Only use accessories (i.e., air cleaners, 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.
Properly install the unit according to the instructions in the
Installation Manual.
Improper installation may result in water leakage, electric
shock, or fire.

ii
HWE1114A GB
Precautions for handling units for use with water
WARNING
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.
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 water that is indicated on the unit when
installing or relocating the unit.
Infiltration of any other types of refrigerant or air into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.
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 water leakage.
ITo avoid water damage to the furnishings, check for water
leak at the completion of all work.
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 these devices, 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.
CAUTION
Do not use the existing water piping.
Store the piping materials indoors, and keep both ends of
the pipes sealed until immediately before installation. Keep
the joints wrapped in plastic bags. If dust or dirt enters the
water circuit, it may damage the heat exchanger and cause
water leakage.
Only use water.
Only use clean water as a refrigerant. The use of water out-
side the specification may damage the refrigerant circuit.

CONTENTS
HWE1114A GB
I
Features
[1] Features.................................................................................................................................... 1
II
Components and Functions
[1] Components and Functions...................................................................................................... 2
III
Specifications
[1] Specifications............................................................................................................................ 4
1.Specifications.......................................................................................................................... 4
2.Electrical component specifications........................................................................................ 6
IV
Outlines and Dimensions
[1] Outlines and Dimensions.......................................................................................................... 7
V
Wiring Diagram
[1] Wiring Diagram ......................................................................................................................... 8
VI
Refrigerant System Diagram
[1] Refrigerant system diagram.................................................................................................... 10
VII
Troubleshooting
[1] Troubleshooting ...................................................................................................................... 11
1.Check methods..................................................................................................................... 11
2.DC fan motor (fan motor/indoor control board)..................................................................... 13
3.Address switch setting .......................................................................................................... 14
4.Voltage test points on the control board ............................................................................... 15
5.Dipswitch setting (Factory setting)........................................................................................ 16
VIII
Disassembly Procedure
[1] Disassembly Procedure.......................................................................................................... 19
1.Control box ........................................................................................................................... 19
2.Thermistor (Intake air) .......................................................................................................... 20
3.Drainpan ............................................................................................................................... 21
4.Thermistor (Water outlet) (Water inlet) ................................................................................. 22
5.Fan and fan motor ................................................................................................................ 23
6.Heat exchanger .................................................................................................................... 24

HWE1114A GB

[ I Features ]
- 1 -
HWE1114A GB
I Features
[1] Features
Model Cooling capacity/Heating capacity
kW
PEFY-WP20VMA-E 2.2/2.5
PEFY-WP25VMA-E 2.8/3.2
PEFY-WP32VMA-E 3.6/4.0
PEFY-WP40VMA-E 4.5/5.0
PEFY-WP50VMA-E 5.6/6.3

[ II Components and Functions ]
- 2 -
HWE1114A GB
II Component s and Function s
[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.
(1) In case of rear inlet (2) In case of bottom inlet
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
Air inlet
Air outlet
Air outlet
Air inlet

[ II Components and Functions ]
- 3 -
HWE1114A 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 indicator L Sensor position
E Operation mode display: COOL, DRY, AUTO,
FAN, HEAT
M Room temperature
F Function mode indicator N Vane setting
G Preset temperature O Fan speed
H Power indicator P Operation lamp

[ III Specifications ]
- 4 -
HWE1114A GB
III Specifications
[1] Specifications
1. Specifications
*1 <Cooling> Indoor temperature: 27°CDB/19°CWB (81°FDB/66°FWB) Outdoor temperature: 35°CDB (95°FDB)
<Heating> Indoor temperature: 20°CDB (68°FWB) Outdoor temperature: 7°CDB/6°CWB (45°FDB/43°FWB)
Model PEFY-WP20VMA-E PEFY-WP25VMA-E
Power supply Voltage V 1-phase 220-230-240
Frequency Hz 50/60
Cooling capacity *1 kW 2.2 2.8
Heating capacity *1 kW 2.5 3.2
Power consumption Cooling kW 0.07 0.09
Heating kW 0.05 0.07
Current consumption Cooling kW 0.55 0.64
Heating kW 0.44 0.53
External finish Galvanized
Dimensions Height mm 250
Width mm 700 900
Depth mm 732
Net weight kg 21 26
Heat exchanger Cross fin(Aluminium fin and copper tube)
Fan Type Sirocco fan x 1
Airflow rate
(Low-Mid-High)
m3/min 7.5-9.0-10.5 10.0-12.0-14.0
External static
pressure
Pa 35/50/70/100/150
Motor Output kW 0.085
Air filter PP Honeycomb fabric (washable)
Diameter of
water pipe
Inlet in Rc3/4 screw
Outlet in Rc3/4 screw
Drain pipe dimensions mm[in.] O.D. 32[1-1/4]
Operating noise(Low-Mid-High) 35Pa dB (A) 23-25-28 23-26-29
50Pa 23-26-29 23-27-30
70Pa 24-27-30 24-28-31
100Pa 25-28-32 26-29-33
150Pa 28-32-36 29-33-37
35Pa 28-30-34 28-30-34
50Pa 28-30-34 28-30-34
70Pa 29-32-36 29-32-36
100Pa 29-33-37 29-33-37
150Pa 31-35-40 32-36-40
Measurement location 1
Aux. duct
*Measured in anechoic room.
2m 2m
1.5m
*Measured in anechoic room.
2m 1m
Aux. duct
1.5m
Measurement location 2

[ III Specifications ]
- 5 -
HWE1114A 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°FWB) Outdoor temperature: 7°CDB/6°CWB (45°FDB/43°FWB)
Model PEFY-
WP32VMA-E
PEFY-
WP40VMA-E
PEFY-
WP50VMA-E
Power supply Voltage V 1-phase 220-230-240
Frequency Hz 50/60
Cooling capacity *1 kW 3.6 4.5 5.6
Heating capacity *1 kW 4.0 5.0 6.3
Power consumption Cooling kW 0.11 0.14 0.14
Heating kW 0.09 0.12 0.12
Current consumption Cooling kW 0.74 1.15 1.15
Heating kW 0.63 1.04 1.04
External finish Galvanized
Dimensions Height mm 250
Width mm 900 1100
Depth mm 732
Net weight kg 26 31
Heat exchanger Cross fin(Aluminium fin and copper tube)
Fan Type Sirocco fan x 1 Sirocco fan x 2
Airflow rate
(Low-Mid-High)
m3/min 12.0-14.5-17.0 14.5-18.0-21.0 14.5-18.0-21.0
External static
pressure
Pa 35/50/70/100/150
Motor Output kW 0.085 0.121
Air filter PP Honeycomb fabric (washable)
Diameter of
water pipe
Inlet in Rc3/4 screw
Outlet in Rc3/4 screw
Drain pipe dimensions mm[in.] O.D. 32[1-1/4]
Operating noise(Low-Mid-High) 35Pa dB (A) 24-28-31 26-29-33 26-29-33
50Pa 25-29-32 26-29-34 26-29-34
70Pa 26-30-33 26-30-35 26-30-35
100Pa 27-31-34 29-33-37 29-33-37
150Pa 29-34-38 32-37-41 32-37-41
35Pa 28-31-35 30-33-37 30-33-37
50Pa 28-32-35 30-34-38 30-34-38
70Pa 29-33-37 31-36-39 31-36-39
100Pa 30-34-38 33-37-41 33-37-41
150Pa 32-37-41 36-41-44 36-41-44
Measurement location 1
Aux. duct
*Measured in anechoic room.
2m 2m
1.5m
*Measured in anechoic room.
2m 1m
Aux. duct
1.5m
Measurement location 2

[ III Specifications ]
- 6 -
HWE1114A GB
2. Electrical component specifications
Component Sym-
bol
PEFY-WP20VMA-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
Water inlet 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
Water outlet 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 85W SIC-70CW-D885-1
Power supply terminal
block
TB2 (L, N, ) 250V 20A
Transmission terminal
block
TB5
TB15 (1, 2) 250V 15A, (M1, M2, S) 250V 20A
Drain float switch DS Open/short detection
Initial contact resistance 500 m or less
Component Sym-
bol
PEFY-
WP25VMA-E
PEFY-
WP32VMA-E
PEFY-
WP40VMA-E
PEFY-
WP50VMA-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
Water inlet 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
Water outlet 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 85W
SIC-70CW-D885-2
8-pole, Output 121W
SIC-70CW-D8121-1
Power supply terminal
block
TB2 (L, N, ) 250V 20A
Transmission terminal
block
TB5
TB15
(1, 2) 250V 15A, (M1, M2, S) 250V 20A
Drain float switch DS Open/short detection
Initial contact resistance 500 m or less

[ IV Outlines and Dimensions ]
- 7 -
HWE1114A GB
IV Outlines and Dimensions
[1] Outlines and Dimensions
1. PEFY-WP20, 25, 32, 40, 50VMA-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-WP40, 50VMA-E models, which have 2 fans. The PEFY-
WP20, 25, 32VMA-E model have 1 fans.
4 To connect an intake duct, uninstall the air filter on the unit, and install a locally procured air filter on the intake
duct on the intake side.
Control box
Air outlet Air
inlet
Water pipe (To HBC unit) Rc3/4 screw
2
1
Water pipe (From HBC unit) Rc3/4 screw
Drain pump
Air Filter
Terminal block (Power source)
Terminal block (Transmission)
Drain pipe (O.D. ø32)
(Spontaneous draining㧕
Drain pipe
(O.D. ø32)
Suspension bolt hole 4 - 14 x 30 Slot
2 × 2 - ø2.9
2 x E -ø2.9
91 64
87117
20
64
40
250
40
D (Duct)
21018
G21
57
10
A
B (Suspension bolt pitch)
C
23
643
(Suspension bolt pitch)
178 (Duct) 23
10
238
32 700
732
356
100
41
217
100
30 100 x (E - 1) = F
58
15
Rc3/4 screw
ԙWater pipe
(To HBC unit)
ԘWater pipe
(From HBC unit)
7
Model A
660800
1200
700 754 900 954 860 9
E
11
D
1060
C
1100
B
1154
PEFY-WP40, 50VMA-E PEFY-WP25, 32VMA-E PEFY-WP20VMA-E
1000
1000
F
858800
G
658
1058
600
Model H MLKJNP
Required space for service and maintenance
More than 300
450
777
450
250㨪300
50
H
50
Access door
Note2
Access door
Ceiling surface
Make the access door at the appointed position properly for service maintenance.
More than 10 mm
More than 20 mm
<accessory>
Drain hose (I.D. ø32)
(Actual length)
65
0 -10
Less than 300 mm
Less than 700 mm
P - ø2.9
112 11112
J
KL
6J
K
K x (M - 1) = N
10300
44 150 54 260 4 780 10
10990449 330PEFY-WP40, 50VMA-E
PEFY-WP25, 32VMA-E PEFY-WP20VMA-E
1000
800
1200

[ V Wiring Diagram ]
- 8 -
HWE1114A GB
V Wiring Diagram
[1] Wiring Diagram
1. PEFY-WP20, 25, 32, 40, 50VMA-E
INSIDE SECTION OF CONTROL BOX
Drainpump Fan motor
I.B.
P.B.
TH23 TH21TH22
t° t° t°
FS
(Blue)
(Blue)
(Blue)
(Blue)
(Blue)
(Black)
(Green)
(Red)
CN44 (Red)
(Red)
(Red)
CN27
ON
ZNR01
CNP
CND
ZNR02
DSA
OFF
F01
SW5
SWC
SW14
SW12
SW11
SW4
SWA
ACL
SW1
SW2 SW3
CNXC1
X01 X10
CNXA1CNXB1 CNMF
CNXC2
CN2A
CN2M
CNXB2 CNXA2
CN51
CN4F CN41
CN105
CN90
CN20
SWE
CN52
CN32
CN3A
TB5
LED2
LED1
DC280 - 340V Rectifier circuit
U
U
POWER SUPPLY
AC220 - 240V 50, 60Hz
TO NEXT INDOOR UNIT
PULL BOX
BREAKER (16A)
FUSE (16A)
N L
TB15
M2
2
TB2
M1
1
S (SHIELD)
MMS
3~
1111
1
11
22752
5
33445 6 4
3
22
2 1
3 1
3
232
3
12
11
3431 454
1
2
41
2
2 1
1~
TO MA REMOTE CONTROLLER
TO OUTDOOR UNIT BC CONTROLLER REMOTE CONTROLLER

[ V Wiring Diagram ]
- 9 -
HWE1114A GB
Table.1 SYMBOL EXPLANATION
SYM-
BOL
NAME SYM-
BOL
NAME SYM-
BOL
NAME
I.B. Indoor controller board CN32 Connector (Remote switch) SW2
(I.B.)
Switch (for capacity code)
P.B. Power supply board CN41 Connector (HA terminal-A) SW3
(I.B.)
Switch (for mode selection)
TB2 Power source terminal block CN51 Connector (Centrally control) SW4
(I.B.)
Switch (for model selection)
TB5 Transmission terminal block CN52 Connector (Remote indica-
tion)
SW5
(I.B.)
Switch (for mode selection)
TB15 Transmission terminal block CN90 Connector (Wireless) SWE
(I.B.)
Connector (emergency opera-
tion)
F01 Fuse AC 250V 6.3A CN105 Connector (IT terminal) SW11
(I.B.)
Switch (1s digit address set)
ZNR01,
02
Varistor CN2A Connector (0-10V Analog in-
put)
SW12
(I.B.)
Switch (10ths digit address
set)
DSA Arrester FS Float switch SW14
(I.B.)
Switch (BRANCH No.)
X01 Aux. relay TH21 Thermistor (inlet air temp.de-
tection)
SWA
(I.B.)
Switch (for static pressure se-
lection)
X10 Aux. relay TH22 Thermistor (piping temp.de-
tection / water inlet)
SWC
(I.B.)
Switch (for static pressure se-
lection)
ACL AC reactor (Power factor im-
provement)
TH23 Thermistor (piping temp. de-
tection / water outlet)
CN27 Connector (Damper) SW1
(I.B.)
Switch (for mode selection)
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 ]
- 10 -
HWE1114A GB
VI Refrigerant System Diagram
[1] Refrigerant system diagram
(A) Water outlet thermistor TH23
(B) Water outlet
(C) Water inlet
(D) Screw connections
(E) Water inlet thermistor TH22
(F) Heat exchanger
(G) Manual air purge valve
(H) Room temperature thermistor TH21
(F)
(H)
(C)
(A)
(E)
(D)
(B)
(G)
Capacity PEFY-WP20, 25, 32, 40, 50VMA-E
Water outlet Rc3/4 screw
Water inlet Rc3/4 screw

[ VII Troubleshooting ]
- 11 -
HWE1114A GB
VII Troubleshooting
[1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
Room temperature thermistor (TH21)
Water inlet thermistor (TH22)
Water outlet thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a volt meter.
(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) Drain-up mechanism
Measure the resistance between the terminals with a tester.
(coil temperature 20°C)
Normal Abnormal
4.3k - 9.6k Open or short
(Refer to the thermistor characteristic graph below.)
Low-temperature thermistor
Room temperature thermistor (TH21)
Water inlet pipe thermistor (TH22)
Water outlet 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
340  Open or short
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
3

[ VII Troubleshooting ]
- 12 -
HWE1114A GB
(4) Drain float switch (CN4F)
Disconnect the connector, and measure the resistance between terminals with a volt meter.
(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
2
3
4
(A)
(A)
(B)
(C)

[ VII Troubleshooting ]
- 13 -
HWE1114A GB
2. DC fan motor (fan motor/indoor control board)
1. CAUTION
A high voltage is applied to the connector for connection to the fan motor (CNMF).
Do not unplug the connector CNMF with the unit energized to avoid damage to the indoor control board and fan motor.
2. Troubleshooting
Symptom: Indoor unit fan does not run.
Check fan motor connector contact
(CNMF).
Replace the indoor control board.
Replace the indoor control board.
Fix the connection.
Yes
No
Yes
No
Yes
No
Check the fan motor position thermistor signal.
Get the motor to make a full rotation or more, and measure the voltage at the test point
V
FG .
(same with the voltage between fan connector 7 (+) and 4(-))
Is the fan motor connector
(CNMF) fully inserted?
Is the voltage within the
normal range?
Replace the motor.
Are 0VDC and 15VDC
displayed alternately?
Check the power supply.
Measure the voltage at the indoor control board.
310 - 340VDC (same with the voltage between fan connector 1 (+) and 4(-))
15VDC (same with the voltage between fan connector 5 (+) and 4(-))
1 - 6.5VDC (same with the voltage between fan connector 6 (+) and 4(-))
[Values for Vsp are the values that are measured with the fan motor in operation.
Vsp is 0V when the fan motor is stopped.]
VDC
Power supply voltage

[ VII Troubleshooting ]
- 14 -
HWE1114A GB
3. Address switch setting
Make sure that power to the unit is turned off.
1. When using an ME remote controller, set the address with the rotary switches (SW11, SW12).
Address setting is not required when the unit remote controller is used.
On-site address setting is required for the indoor units to run.
2. Address settings vary in different systems.
Refer to the section on address setting in the outdoor unit installation manual.
3. Address is set with a combination of SW12 (10's digit) and SW11 (1's digit).
To set the address to "3," set SW12 to "0" and SW11 to "3."
To set the address to "25," set SW 12 to "2" and SW 11 to "5."
(A) Indoor unit control board
(B) Factory setting (all models)
ON
OFF
ON
OFF
(A)
(B)