Mitsubishi PKFY-P20VAM, PKFY-P25VAM Service Manual

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

CONTENTS

1. FEATURES·········································2

2. SAFETY PRECAUTION ·····················3

3. PART NAMES AND FUNCTIONS······4

4. SPECIFICATION·································6

5. OUTLINES AND DIMENSIONS ·········8

6. WIRING DIAGRAM·····························9

7. REFRIGERANT SYSTEM DIAGRAM···10

8. TROUBLESHOOTING······················11

9. DISASSEMBLY PROCEDURE·········16

10. PARTS LIST ·····································19

PKFY-P20VAM PKFY-P25VAM

No. OC163

1998

Models

Wall Mounted

Series PKFY

INDOOR UNIT

MODEL NAME

R407C

FEATURES

1. Compact 29.5cm high body fits snugly in even limited spaces.

2. Lightweight 8.5kg unit easy to transport and install.

3. Auto-flap shutter enhances good looks.

4. Front power supply box for easier wiring even after installation.

The front power supply box allows electrical wiring work to be done after the indoor unit has been installed. For easier installation, all the screws required for securing the indoor unit to the wall are accessible from the front of the unit.

5. 5-way piping provides more flexibility in selecting installation sites.

All piping including drainage can be conned from the rear, right, base, left and left rear of the unit, providing much greater flexibility in laying out piping and selecting installation sites.

Indoor unit

Wall Mounted

Series PKFY

Models

PKFY-P20VAM PKFY-P25VAM

Cooling capacity/Heating capacity

2,300 / 2,600 2,900 / 3,300

kcal/h

2,000 / 2,250 2,500 / 2,800

SAFETY PRECAUTION

Precautions for devices that use R407C refriqerant.

Cautions for connecting with R407C outdoor unit.

Caution:

· Do not use R407C piping after use it for R22.

· Do not use the existing refrigerant piping.

-The old refrigerant and refrigerator oil in the existing piping contains a large amount of chlorine which may cause the refrigerator oil of the new unit to deteriorate.

· Use refrigerant piping made of C1220(CU-DHP) phosphorus deoxidized copper as specified in the JIS H3300 “Copper and copper alloy seamless pipes and tubes”. In addition, be sure that the inner and outer surfaces of the pipes are clean and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminant.

-Contaminants on the inside of the refrigerant piping may cause the refrigerant residual oil to deteriorate.

· Store the piping to be used during installation indoors and keep both ends of the piping sealed until just before

brazing. (Store elbows and other joints in a plastic bag.)

-If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and compressor trouble may result.

· Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.

-The refrigerator oil with degrade if it is mixed with a large amount of mineral oil.

· Use liquid refrigerant to fill the system.

-If gas refrigerant is used to seal the system, the composition of the refrigerant in the cylinder will change and performance may drop.

· Do not use a refrigerant other than R407C.

-If another refrigerant (R22, etc.) is used, the chlorine in the refrigerant may cause the refrigerator oil to deteriorate.

· Use a vacuum pump with a reverse flow check valve. Evacuate sufficiently for one hour, leave it put for another one hour and be sure not to down the vacuum degree.

· Do not use the following tools that are used with conventional refrigerants.

No. Tool name Specifications

1 Gauge manifold ·Only for R407C.

·Use the existing fitting SPECIFICATIONS. (UNF7/16)

·Use high-tension side pressure of 35kgf/cm

or over.

2 Charge hose ·Only for R407C.

Use pressure performance of 52kgf/cm2or over.

3 Electronic scale 4 Gas leak detector ·Use the detector for R134a or R407C. 5 Adapter for reverse flow check. ·Attach on vacuum pump. 6 Refrigerant charge base. 7 Refrigerant cylinder. ·For R407C ·Top of cylinder (Brown)

·Cylinder with syphon

8 Refrigerant recovery equipment.

· Do not use a charging cylinder.

-Using a charging cylinder may cause the refrigerator to deteriorate.

· Be especially careful when managing the tools.

-If dust, dirt, or water gets in the refrigerant cycle, the refrigerant may deteriorate.

· For gas leak detecter, be sure to use it only for HFC refrigerant. (same as for R134a)

· If moving, put the cap on the flare at indoor unit side to prevent to mix dust or water.

· If measures on refrigerant leackage or repair servicing, be sure to refer the manual for outdoor unit.

PART NAMES AND FUNCTIONS

● Indoor Unit

PKFY-P20VAM PKFY-P25VAM

● Remote controller [PAR-F25MA]

● Once the operation of the unit is set, subsequent operations can only be performed by pressing the ON/OFF button

repeatedly.

TIMER button

This switches between continuous

operation and the timer operation

AIR SPEED button

The sets the ventilation fan speed.

● Operation buttons

TIMER SETTING button

This sets or switches the current

time, start time and stop time.

OPERATION SWITCH button

Press this button to switch the cooler electronic dry (denumidity), automatic and heater modes.

TEMP ADJUSTMENT button

This sets the room temperature. The temperature setting can be performed in 1°C units.

Setting range :

Cooler 19°C to 30°C Heater 17°C to 28°C

CHECK-TEST RUN button

Only press this button to perform an inspection check or test operation. Do not use it for nomal operation

FILTER button

This resets the filter service indication display

AIR DIRECTION button

This adjusts the vertical angle of the

ventilation.

ON/OFF button

This switches between the operation

and stop modes each time it is pressed. The lamp on this button lights during operation.

The model name of the remote controller is indicated.

LOUVER button

This switches the horizontal fan motion ON and OFF.

(This button does not operate in this

model.)

Air intake grille

Air intake

Guide vane

Air Outlet

Aute Vane

Filter

Caution

● Only the / display lights when the unit is stopped and power supplied to the unit.

● “NOT AVAILABLE” is displayed when the AIR DIRECTION button are pressed.This indicates that this room unit is not

equipped with the fan dieection adjustment function and the louver function.

● When the power is turned on, “‘HO” is indicated on the room temperature indication area for a while (maximum for 2 minute). It does not indicate a malfunction. Operation the unit after “‘HO” indication disappear.

● When power is turned ON for the first time, it is normal that “HO” is displayed on the room temperature indication(For max. 2minutes.) Please wait until this “HO” indication disappear then start the operation.

CENTRALLY CONTROLLED display

This indicates when the unit is

controlled by optional features such as central control type remote controller.

TIMER display

This indicates when the continous

operation and time operation modes are set.

It also display the time for the timer

operation at the same time as when it is set.

OPERATION MODE display

This indicates the operation mode.

STANDBY display

This indicates when the standby

mode is set from the time the sleep operation starts until the heating air is discharged.

DEFROST display

This indicates when the defrost

operation is performed.

CHECK display

This indicates when a malfunction

has occurred in the unit which should be checked.

CLOCK display

The current time , start time and stop

time can be displayed in tensecond intervals by pressing the time switch button. The start time or stop time is always displayed during the timer operation.

● Display

In this display example on the bottom left, a condition where all display lamps light is shown for explanation purposes although this differs from actual operation.

Operation lamp

This lamp lights during operation, goes off when the unit stops and flashes when a malfunction occurs.

POWER display

This lamp lights when electricity is supplied to the unit.

SET TEMPERATURE display

This displays the selected setting

temperature.

AIR DIRECTION display

This displays the air direction.

ROOM TEMPERATURE display

The temperature of the suction air is

displayed during operation. The display range is 8° to 39°C. The display flashes 8°C when the actual temperature is less than 8° and flashes 39°C when the actual temperature is greater than 39°C.

display

This display lights in the check mode or when a test operation is performed.

CHECK MODE

TEST RUN

This lamp lights when the filter need to be cleaned.

AIR SPEED display

The selected fan speed is displayed.

FILTER display

SPECIFICATION

2-1 Specification

Power Supply

Starting Current

Fan ✕ No.

Air flow (Note 2)

External stafic pressure

Fan motor output

Item

Power

Cooling capacity

Heating capacity

Exterior <munsell symbol>

Out dimensions

Heat exchanger

Fan

Insulator

Air filter

Pipe dimensions

Drain pipe size

Noise level

Product weight

Unit

[,V,Hz

Z/h

—

K/min

—

[mm

dB (A)

Cooling

Heating

Cooling

Heating

Height

Width

Depth

Gas side

Liquid side

PKFY-P20VAM

2,000

2,250

PKFY-P25VAM

2,500

2,800

Single phase ,220V-240V,50Hz

0.04

0.20

Plastic munsell : <2.60Y 8.66/0.69>

295

815

158

Cross fin

Lineflow fan ✕ 1

5.9-5.6-5.2-4.9

0.017

Polyethylene sheet

PP honey comb

12.7 <1 / 2F>

6.35 <1 / 4F>

Outer dimeter [28 Outer diameter of the connection

36-35-33-32

8.5

Electric

characteristic

Note 1. Rating conditions (JIS B8615)

Cooling : Indoor 27°C DB. 19.5°C WB

Outdoor 35°C DB. 24°C WB

Heating : Indoor 21°C DB.

Outdoor 7°C DB. 6°C WB

Note 2. Air flow and the noise level are indicated as High-Middium 1-Middium2-Low.

2-2 Electrical parts specifications

Model Transformer

Room temperature thermistor

Liquid pipe

thermistor

Gas pipe

thermistor

Fuse (Indoor controller board) Fan motor (with thermal fuse) Fan motor capacitor

Vane motor (with limit switch) Liner expansion valve

Power supply terminal block

Transmission terminal block

Symbol

TH21

TH22

TH23

FUSE

LEV

TB2

TB5

(Primary) 50/60Hz 220-240V (Secondry) (18.4V 1.2A)

Resistance:

0$C / 15k1, 10$C / 9.6k1, 20$C / 6.3k1, 25$C / 5.4k1, 30$C / 4.3k1, 40$C / 3.0k1

Resistance:

0$C/15k1, 10$C/9.6k1, 20$C/6.3k1, 25$C/5.4k1, 30$C/4.3k1, 40$C/3.0k1

250V 6.3A

4-Pole Output 17W / RC4V17

1.5+F ✕ 440V

MSFBC20A76 DC12V

DC12V Stepping motor drive

Port [3.2 (0~2000pulse) EDM-402ME

(L, N, ;) 264V 20A

(M1, M2,S ) 250V 10A

PKFY-P20VAM/PKFY-P25VAM

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