Mitsubishi PKFY-P20VAM-A, PKFY-P25VAM-A Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

2001

No. OC254

Series PKFY

Indoor unit [Model names] [Service Ref.]

PKFY-P20VAM-A PKFY-P20VAM-A PKFY-P25VAM-A PKFY-P25VAM-A

Wall Mounted

INDOOR UNIT

R407C

CONTENTS

1. SAFETY PRECAUTION·····················3

2. PART NAMES AND FUNCTIONS······5

3. SPECIFICATION ·································7

4. OUTLINES AND DIMENSIONS ·········9

5. WIRING DIAGRAM···························10

6. REFRIGERANT SYSTEM DIAGRAM···11

7. TROUBLESHOOTING······················12

8. DISASSEMBLY PROCEDURE·········17

9. PARTS LIST ·····································20

R22

SAFETY PRECAUTION

Cautions for using with the outdoor unit which adopts R407C refrigerant.

· Do not use the existing refrigerant piping.

-The old refrigerant and lubricant in the existing piping contains a large amount of chlorine which may cause the lubricant deterioration of the new unit.

· Use “low residual oil piping”.

-If there is a large amount of residual oil (hydraulic oil, etc.) inside the piping and joints, deterioration of the lubricant will result.

· Store the piping to be used during installation indoors with keep both ends 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 ESTR , ETHER or HAB as the lubricant to coat flares and flange connection parts.

Use liquid refrigerant to seal 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 lubricant deterioration.

· Use a vacuum pump with a reverse flow check valve.

-The vacuum pump oil may flow back into the refrigerant cycle and cause the lubricant deterioration.

Gravimeter

Unit

[1] Service tools

Use the below service tools as exclusive tools for R407C refrigerant.

No. Tool name Specifications

1 Gauge manifold ·Only for R407C.

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

·Use high-tension side pressure of 3.43MPa·G or over.

2 Charge hose ·Only for R407C.

·Use pressure performance of 5.10MPa·G or 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.

[2] Notice on repair service

·After recovering the all refrigerant in the unit, proceed to working.

·Do not release refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant.

[3] Refrigerant recharging

(1) Refrigerant recharging process

1Direct charging from the cylinder.

·R407C cylinder are available on the market has a syphon pipe.

·Leave the syphon pipe cylinder standing and recharge it. (By liquid refrigerant)

(2) Recharge in refrigerant leakage case

·After recovering the all refrigerant in the unit, proceed to working.

·Do not release the refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant.

PAR-20MAA

ON/OFF

CENTRALLY CONTROLLED

ERROR CODE

CLOCK

ON OFF

˚C

CHECK

CHECK MODE

FILTER

TEST RUN FUNCTION

˚C

1Hr.

NOT AVAILABLE

STAND BY DEFROST

FILTER

CHECK TEST

TEMP.

TIMER SET

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

OPERATION SWITCH button

This sets the room temperature. The temperature setting can be performed in 1: units Setting range Cooler 19: to 30: Heater 17: to 28:

TEMP. ADJUSTMENT button

This switches between continuous operation and the timer operation.

TIMER button

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

ON/OFF button

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

CHECK-TEST RUN button

This switch the horizontal fan motion ON and OFF.

(Not available for this model.)

LOUVER button

This adjusts the vertical angle of the ventilation.

AIR DIRECTION button

This resets the filter service indication display

FILTER button

This sets the current time, start time and stop time.

TIME SETTING button

This sets the ventilation fan speed.

AIR SPEED button

PART NAMES AND FUNCTIONS

● Indoor Unit

PKFY-P20VAM-A PKFY-P25VAM-A

Filter

Air intake grille

Air intake

Auto Vane

Guide vane

Air Outlet

● MA remote controller [PAR-20MAA]

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

repeatedly.

● Operation buttons

PAR-20MAA

ON/OFF

CENTRALLY CONTROLLED

ERROR CODE

CLOCK

ON OFF

˚C

CHECK

CHECK MODE

FILTER

TEST RUN FUNCTION

˚C

1Hr.

NOT AVAILABLE

STAND BY DEFROST

FILTER

CHECK TEST

TEMP.

TIMER SET

● 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 continuous

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

The [STANDBY] symbol is only dis-

played from the time the heating operation starts unit the heated air begins to blow.

CLOCK display

The current time , start time and stop

time can be displayed in ten second 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°C to 39°C. The display flashes 8°C when the actual temperature is less than 8°C 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 a malfunction occurs.

DEFROST display

This indicates when the defrost operation is performed.

CHECK MODE

TEST RUN

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

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 Power display lights when the unit is stopped and power supplied to the unit.

● When the central control remote control unit, which is sold separately, is used the ON-OFF button, operation switch button

and TEMP. adjustment button do not operate.

● “NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped with the fan direction adjustment function and the louver function.

● When power is turned ON for the first time, it is normal that “H0” is displayed on the room temperature indication (For max. 2minutes). Please wait until this “H0” 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

Fan ✕ No. Air flow w 2 External static pressure Fan motor output

Item Power Cooling capacity Heating capacity

Exterior <munsell symbol> Out dimensions

Heat exchanger

Fan

Insulator Air filter

Pipe dimensions

Unit drain pipe size Noise level w 2 Product weight

Unit

[,V,Hz

kW kW kW kW

A A

— mm mm mm

—

K/min

Pa kW

—

[mm(in.) [mm(in.)

[mm

Cooling Heating Cooling Heating

Height Width Depth

Gas side Liquid side

PKFY-P20VAM-A

2.2

2.5

PKFY-P25VAM-A

2.8

3.2

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 (1/2")

6.35 (1/4")

PVC pipe VP-16 connectable (I.D. 16)

36-35-33-32

8.5

Electric

characteristic

Single phase, 220-230-240V, 50Hz Single phase, 220V, 60Hz

SPECIFICATION

3-1. Specification

Note 1. Rating conditions

Cooling :Indoor D.B. 27°C W.B. 19.0°C Heating : Indoor D.B. 20°C

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

Outdoor D.B. 35°C W.B. 24°C Outdoor D.B. 7°C W.B. 6°C

3-2. Electrical parts specifications

Parts name

Model

Symbol

TH21

TH22

TH23

FUSE

LEV

TB2

TB5

Resistance 0:/15k", 10:/9.6k", 20:/6.3k", 25:/5.2k", 30:/4.3k", 40:/3.0k"

250V 6.3A

4-Pole Output 17W / RC4V17

1.5µF ✕ 440V

MSFBC20A76 DC12V

(L, N, ;) 250V 20A

(M1, M2) 250V 10A

Liquid pipe thermistor

Gas pipe thermistor

Fan motor capacitor

Linear expansion valve

PKFY-P20VAM-A PKFY-P25VAM-A

Room temperature thermistor

Fuse (Indoor controller board)

Fan motor (with thermal fuse)

Vane motor (with limit switch)

Power supply terminal block

Transmission terminal block

DC12V Stepping motor drive

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

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