Mitsubishi PKFY-20VAM, PKFY-25VAM Service Manual

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

1997

No. OC112

Series PKFY

Models

PKFY-20VAM PKFY-25VAM

INDOOR UNIT

Wall Mounted

MODEL NAME

CONTENTS

1. PART NAMES AND FUNCTIONS········2

2. SPECIFICATION···································4

3. OUTLINES AND DIMENSIONS············6

4. WIRING DIAGRAM ·······························7

5. REFRIGERANT SYSTEM DIAGRAM ··8

6. TROUBLESHOOTING··························9

7. DISASSEMBLY PROCEDURE ···········14

8. PARTS LIST········································17

PART NAMES AND FUNCTIONS

● Indoor Unit

Filter

Air intake grille

Air intake

Aute Vane

Guide vane

Air Outlet

● 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.

● Operation buttons

TIMER button

This switches between continuous

operation and the timer operation

TIMER SETTING button

This sets or switches the current

time, start time and stop time.

AIR SPEED button

The sets the ventilation fan speed.

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

The model name of the remote con-

troller is indicated.

LOUVER button

This switches the horizontal fan motion ON and OFF.

(This button does not operate in this

model.)

ON/OFF button

This switches between the operation

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

AIR DIRECTION button

This adjusts the vertical angle of the

ventilation.

FILTER button

This resets the filter service indication display

CHECK-TEST RUN button

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

● Display

CENTRALLY CONTROLLED display

This indicates when the unit is con-

trolled 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 oper-

ation is performed.

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.

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.

AIR DIRECTION display

This displays the air direction.

AIR SPEED display

The selected fan speed is displayed.

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.

Operation lamp

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

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

CHECK MODE

TEST RUN

display

FILTER display

CHECK display

This indicates when a malfunction

has occurred in the unit which should be checked.

SET TEMPERATURE display

This displays the selected setting

temperature.

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.

POWER display

This lamp lights when electricity is supplied to the unit.

This lamp lights when the filter need to be cleaned.

Power Supply

Starting Current

Fanx No. Air flow Note2 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 Z/h

kW kW

A A

— mm mm mm

—

k/min

—

[mm [mm [mm

dB (A)

Cooling Heating Cooling Heating

Height Width Depth

Gas side Liquid side

PKFY-20VAM

2000 2250

PKFY-25VAM

2500 2800

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

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

SPECIFICATION

2-1 Specification

Note 1. Rating conditions (JIS B8616)

Cooling :Indoor 27°C DB. 19.5°C WB Heating : Indoor 20°C DB.

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

Outdoor 35°C DB. 24°C WB Outdoor 7°C DB. 6°C WB

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

MF1,2

LEV

TB2

TB5

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

Resistance:

0¡C / 15k½, 10¡C / 9.6k½, 20¡C / 6.3k½, 25¡C / 5.4k½, 30¡C / 4.3k½, 40¡C / 3.0k½

Resistance:

0¡C/15k½, 10¡C/9.6k½, 20¡C/6.3k½, 25¡C/5.4k½, 30¡C/4.3k½, 40¡C/3.0k½

250V 6.3A

4-Pole Output 17W / RC4V17

1.5µF ✕ 440V

MSFBC20A76 DC12V

DC12V Stepping motor drive

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

(L, N, ;) 264V 20A

(M1, M2,S ) 250V 10A

PKFY-20VAM/PKFY-25VAM

783

C B A

25.5

159

407.5

328328

298

235

205

175

170

298

407.5

168

135

125

1103510

27.540536587

113

128

295

260

225

190

190 180

159

155

120

44 50

133

122.5

97.5

47.5

22.5

102.5

124

4-4.5✕35

4-4.5✕40

4-4.5✕37

4-11✕20

8- 4.3

72.5

Air intake dimension

Air intake

Installation plate

Knock out hole

Installation space

100 or more

20 or more

130 or more

Address board

Drain pipe

Liquid pipe Flare connection 1/4F

Flare connection 1/2F

Insulation out dimention 28

Insulation Out dimention 35

Gas pipe

Refrigrant

pipe

Address board is protected by

the plastic cover.

For the setting, remark 1-screw

using the screw driver.

Installation plate

Air intake dimension

Air outlet dimension

Drain pipe length

Gas pipe

Detail of Terminal block

Terminal block for remote controller

Terminal block for

remote controller

Terminal block for

power supply

address board

Air outlet

angle

Air outlet

dimention

Air outlet direction

Detail of

address board

Dip swich

Terminal block

Terminal block for power supply

Knock out hole for

right - hand side piping

Knock out hole

for left - hand

side piping

Knock out hole

for under piping

Liquid pipe

815

630

695

660

450

520

45 91.5

2.5

2.5 16

4 50

R15

R12

24.4

116

110

146

295

21.5

247.5

150

158

70.3

37.4

2.5 60

4- 9

12- 2.8

87- 5.1

Note1.For the instalation, be sure to leave some space in case there

is finge at edge of the celing.

Note2. Use the M10 or W3/8 bolt for the istallation plate.

Note3. Refer for the specification table it below .

Detail of knock out hole (A B C)

Connection out dimention 28

Lotary switch(part No.)

Lotary switch(self address)

Secondry

Primary

Knock out hole

for the remote

controller wiring

Knock out hole for the

remote controller wiring

Control wire (30v)

: Follow the instruction stated at Note3 for

the connection with the control wire.

: There is no terminal board for contlroller.

54 or more for left

or left back piping

Unit transplant parts

pipe hole

Position detail of the tapping screw and bats at pipe intake

Center of gravity hole for installation

Air intake dimention

OUTLINES AND DIMENSIONS

Unit : mm

+ 14 hidden pages