Mitsubishi Electric PEFY-P20VMR-E-L, PEFY-P20VMR-E-R, PEFY-P25VMR-E-L, PEFY-P25VMR-E-R, PEFY-P32VMR-E-L Service Manual

Air-Conditioners For Building Application

TECHNICAL & SERVICE MANUAL

Models

PEFY-P20VMR-E-L/R
PEFY-P25VMR-E-L/R
PEFY-P32VMR-E-L/R

For use with R410A

2006

i

[ SAFETY PRECAUTIONS ]

I SAFETY PRECAUTIONS

SAFETY PRECAUTIONS

1. Read before installation and performing electrical work

Symbol explanations

: 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

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

damage to the unit.

WARNING

Carefully read the labels affixed to the main unit.

Ask your dealer or a qualified technician to install the unit.
Improper installation by the user may result in water

leakage, 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
injury.

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.

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
electrician 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.

[ SAFETY PRECAUTIONS ]

ii

WARNING

2. Precautions for handling units for use with R410A

CAUTION

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

infiltrate 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.

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.

When installing the unit in a small space, take approp riate
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
generated.

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
recommended by Mitsubishi Electric may result in smoke,
fire, or explosion.

Consult your dealer for proper disposal method.

Do not use a leak detection additive.

Do not use the existing refrigerant piping.
A large amount of chlorine that may be contained in the

residual 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
deoxidized copper. Keep the inner and outer surfaces of
the pipes clean and free of such contaminants as sulfur,
oxides, dust, dirt, shaving particles, oil, and moisture.

Contaminants in the refrigerant piping may cause the
refrigerator oil to deteriorate.

Store the piping materials indoors, and keep both ends of
the pipes sealed until immediately before brazing. (Keep
elbows 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
refrigerator 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
cycle 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
detector, 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, the composition 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

[1] FEATURES

Features......................................................................................................................................... 1

[2] COMPONENTS AND FUNCTIONS

Components and functions......................................... ... .... ... ... ... .... ... ... ... ... .... ... ... ......................... 2

[3] SPECIFICATIONS

3-1. Specifications ...................................................................................................................... 4

3-2. Electrical component specifications..... ... .... ... ... ... .... ... ... ... .... ... ... ... ... ................................... 5

[4] OUTLINES AND DIMENSIONS

PEFY-P20· 25· 32VMR-E-L/R .......................................................................................................6

[5] WIRING DIAGRAM

PEFY-P20· 25· 32VMR-E-L/R .......................................................................................................7

[6] REFRIGERANT SYSTEM DIAGRAM

Refrigerant system diagram........................................................................................................... 9

[7] TROUBLESHOOTING

7-1. Check methods.................................................................................................................. 10

7-2. Address switch setting.......................................................................................................12

7-3. Dipswitch setting (Factory setting).... ... ... .... ... ... ... .... ... ... ... .... ... ... ... ... ................................. 13

7-4. Functions of the LED on the indoor unit service board...................................................... 13

[8] DISASSEMBLY PROCEDURE

8-1. Control box....... ... ... ... .... ... ... ... .... ... .......................................... ... ... ... .... ... .......................... 14

8-2. Fan and fan motor.............................................................................................................15

8-3. Drainpan............................................................................................................................ 16

8-4. LEV, thermistor (Liquid/gas pipe) ...................................................................................... 17

8-5. Heat exchanger............................................. ... ... .... ... ... .......................................... ... ....... 18

8-6. Control box internal layout............................. ... ... .... ... ... ... .... ... ... ... ... .... ... ... ... ....................19

8-7. Thermistor position............................................................................................................ 19

- 1 -

[ I FEATURES ]

I FEATURES

[1] FEATURES

Model

Cooling capacity/Heating capacity

kW

PEFY-P20VMR-E-L/R
PEFY-P25VMR-E-L/R
PEFY-P32VMR-E-L/R

2.2/2.5

2.8/3.2

3.6/4.0

- 2 -

[ II COMPONENTS AND FUNCTIONS ]

II COMPONENTS AND FUNCTIONS

[2] COMPONENTS AND FUNCTIONS

Indoor (Main) Unit

Remote controller

[PAR-21MAA]

Once the operation mode is selected, the unit will remain in the selected mode until

changed.

[Remote Controller Button]

Air

Air

Keep the remote controller out of direct sunlight to ensure accurate measurement of room temperature.
The sensor at the lower right-hand section of the remote controller must be free from obstructions to

ensure accurate measurement of room temperature.

[Set Temperature] Button
[Timer Menu] Button [Mode] Button
[Monitor/Set] Button [Back] Button
[Timer On/Off] Button [Louver] Button
[Set Day] Button [Operation] Button
[Fan Speed] Button [Vane Control] Button
[Ventilation] Button
[Operation] Button
[Check/Clear] Button [Test Run] Button
[Filter] Button [ON/OFF] Button
[ ] Button
Position of built-in room temperature thermistor

[Set Time] Button

- 3 -

[ II COMPONENTS AND FUNCTIONS ]

[Remote Controller Display]

ON/OFF

ERROR CODE

TIME

ON
OFFHrAFTER

SUN MON TUE WED THU FRI SAT

TIMER
AFTER

ONLY 1Hr.

°C°F

WEEKLY

SIMPLE

AUTO OFF

FILTER

FUNCTION

°C

°F

TEMP.

Current time/Timer time
Centralized control indicator
Timer OFF indicator
Timer mode
Operation mode display: COOL, DRY, AUTO, FAN, HEAT
Function Lock indicator Preset temperature
Power indicator Louver swing
Ventilation Filter sign
Thermistor position Room temperature
Vane setting Fan speed

- 4 -

[ III SPECIFICATIONS ]

III SPECIFICATIONS

[3] SPECIFICATIONS

3-1. Specifications

Model PEFY-P20VMR-E-L/R PEFY-P25VMR-E-L/R PEFY-P32VMR-E-L/R
Cooling capacity *1 kW 2.2 2.8 3.6
Heating capacity *1 kW 2.5 3.2 4.0
Power supply voltage/frequency Single-phase 220/230/24 0 V 50Hz 220/230 V 60Hz

Power consumption

Cooling kW 0.06/0.06 0.07/0.08
Heating kW 0.06/0.06 0.07/0.08

Current consumption

Cooling A 0.29/0.29 0.34/0.38
Heating A 0.29/0.29 0.34/0.38

Settable temperature
range on the remote
controller

Cooling °C (°F) 19 to 30 (67 to 86)
Heating °C (°F) 17 to 28 (63 to 83)

Fan

Type × Quantity Sirocco fan × 1

External static pressure

5

Single-phase induction motor
Motor output kW 0.018 0.023
Driving mechanism Direct-driven

Airflow rate
(Low-Mid-High)

m

3

/min 4.8-5.8-7.9 4.8-5.8-9.3

External finish Galvanized

External dimensions
H × W × D

Rear inlet model

mm 292 × 640 × 580
In. 11-1/2 × 25-1/4 × 22-7/8

Bottom inlet model

mm 300 × 640 × 570
In. 11-7/8 × 25-1/4 × 22-1/2

Net weight kg 18

Wire

Min. wire size mm (in.) 1.6 (1/8)
Breaker amperage A 16

Refrigerant pipe
diameter

Liquid R410A mm (in.) ø6.35 (ø1/4) Brazed connection
Gas R410A mm (in.) ø12.7(ø1/2) Brazed connection

Drain pipe diameter mm (in.) Drain hose O.D. 26 (1-1/32)
Operating noise *2

(Low-Mid-High)
(measured in
anechoic room)

220V dB<A> 20-25-30 20-25-33
230V dB<A> 21-26-32 21-26-35
240V dB<A> 22-27-30 22-27-33

Insulation material Polyethylene foam, Urethane foam
Air filter PP Honeycomb fabric (washable)
Refrigerant control device LEV
Connectable outdoor unit R410A CITY MULTI
Protection devices Fuse
Heat exchanger Cross fin (Aluminium fin and copper tube)
Note:*1 Maximum capacity of the unit under the following conditions

<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)
Pipe length: 7.5m (24-9/16ft) Height difference: 0m (0ft)

*2 Noise levels of the unit with a rear air inlet. (Noise levels are higher for the unit with a bottom air inlet.)