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