Mitsubishi Electric PKFY-20VAM Technical & Service Manual

Series pkfy wall mounted

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Technical & service manual (20 pages)

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SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

Wall Mounted

Series PKFY

PKFY-20VAM

Models

PKFY-25VAM

INDOOR UNIT

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

MODEL NAME

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

1997

No. OC112

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Summary of Contents for Mitsubishi Electric PKFY-20VAM

Page 1: Table Of Contents
1997 SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS No. OC112 TECHNICAL & SERVICE MANUAL Wall Mounted Series PKFY <Indoor unit> PKFY-20VAM Models PKFY-25VAM CONTENTS 1. PART NAMES AND FUNCTIONS ········2 2. SPECIFICATION ···································4 3. OUTLINES AND DIMENSIONS············6 4. WIRING DIAGRAM·······························7 5. REFRIGERANT SYSTEM DIAGRAM ··8 INDOOR UNIT 6.
Page 2: Part Names And Functions
PART NAMES AND FUNCTIONS Indoor Unit Air intake Air intake grille Filter 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.
Page 3 Display In this display example on the bot- CENTRALLY CLOCK display tom left, a condition where all dis- CONTROLLED display play lamps light is shown for expla- The current time , start time and stop time can be displayed in tensecond nation purposes although this differs This indicates when the unit is con- intervals by pressing the time switch...
Page 4: Specification
SPECIFICATION 2-1 Specification Item Unit PKFY-20VAM PKFY-25VAM Power V · Hz Single phase 220V-240V 50Hz Cooling capacity 2000 2500 Heating capacity 2250 2800 Cooling 0.04 Power Supply Heating 0.04 Cooling 0.20 Starting Current Heating 0.20 Exterior <munsell symbol> — Plastic munsell : <2.60Y 8.66/0.69>...
Page 5 2-2 Electrical parts specifications Model Symbol PKFY-20VAM/PKFY-25VAM Transformer (Primary) 50/60Hz 220-240V (Secondry) (18.4V 1.2A) Room temperature thermistor Resistance: TH21 0¡C / 15k½, 10¡C / 9.6k½, 20¡C / 6.3k½, 25¡C / 5.4k½, 30¡C / 4.3k½, 40¡C / 3.0k½ Liquid pipe thermistor...
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit : mm...
Page 7: Wiring Diagram
WIRING DIAGRAM MODELS : PKFY-20VAM, PKFY-25VAM Legend Symbol Name Symbol Name Symbol Name Indoor controller board Power supply terminal block Gas pipe thermistor TH23 (0°C / 15kΩ, 25°C / 5.4kΩ) CN32 Remote switch connector Transmission terminal block CN41 HA terminal — A connector...
Page 8: Refrigerant System Diagram
Gas pipe thermistor TH23 Gas pipe Flare Strainer (#50mesh) Liquid pipe thermistor TH22 Heat exchanger Linear expansion valve Strainer (#100mesh) Room temperature thermistor TH21 Refrigeration pipe size (Flare connection size) Models PKFY-20VAM, PKFY-25VAM Item Gas pipe {12.7 <1/2F> Liquid pipe {6.35 <1/4F>...
Page 9 TROUBLESHOOTING 6-1. How to check Part Name Check points Room temperature Disconnect the connector, then measure the resistance using a tester. thermistor(TH21) (Sorrounding temperature 10°C~30°C) Liquid pipe thermistor(TH22) Normal Abnormal Gas pipe (Refer to the thermistor) thermistor(TH23) 4.3k ~9.6k Open or short Vane motor 1Measure the resistance between the terminals using a tester.(Surrounding tempreture 25:.) Normal...
Page 10 <Thermistor Characteristic graph> < Thermistor for lower temperature > Room temperature thermistor(TH21) Thermistor for Liquid pipe thermistor(TH22) lower temperature Gas pipe thermistor(TH23) Drain sensor(THD) Thermistor R =15k' ± 3% Fixed number of B=3480k' ± 2% Rt=15exp { 3480( 273+t 15k' 9.6k' 6.3k' 5.2k'...
Page 11 <Output pulse signal and the valve operation> Output Output (Phase) Closing a valve : 1 Opening a valve : 4 The output pulse shift in above order. 1. When linear expasion valve operation stops, all output phase become OFF. 2. At phase interruption or when phase does not shift in order, motor does not rotate smoothly and motor lock, and vibrates.
Page 12 6-2. FUNCTION OF DIPSWITCH PKFY-20VAM, PKFY-25VAM Operation by switch Switch Pole Function Remarks Thermistor<Intake temperature> Indoor unit Bult-in remote controller Address board position Filter crogging ProvidedNot provided <At delivery> Filter life 2,500hr 100hr 1 2 3 4 5 6 7 8 9 10...
Page 13 Switch Operation by switch Remarks Address board SW11 1st digit Address can be set while the address unit is stopped. SW12 SW11 setting Address setting should be done when network <At delivery> SW12 remote controller (PAR-F25M) is being used. SW12 SW11 2st digit address...
Page 14: Disassembly Procedure
DISASSEMBLY PROCEDURE PKFY-25VAM Be careful on removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. REMOVING THE LOWER SIDE OF THE INDOOR UNIT FROM Figure 1 Figure 2 THE INSTALLATION PLATE When there is removing plate (1) Remove the corner box at right lower side of the indoor unit.
Page 15 OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 3. REMOVING THE INDOOR MICRO CONTROLLER BOARD Electrical parts box cover Photo 2 AND INDOOR POWER BOARD (1) Remove the front panel (Refer to (2)). (1) Remove the electrical box cover (screw 4 (Refer to the photo 2). INDOOR MICRO CONTROLLER BOARD (1) Disconnect the following connectors on the indoor micro controller board.
Page 16 OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 5. REMOVING THE NOZZLE ASSEMBLE Photo 5 (1) Remove the front panel (Refer to (2)). Heat exchanger Electrical parts box (2) Remove the electrical parts box cover. (3) Disconnect the connector (CN5V) on the indoor micro con Drain hose troller board.
Page 17: Parts List
PARTS LIST PKFY-20VAM PANEL PARTS PKFY-25VAM Q'ty / set Price Wiring Recom- Remarks No. Parts No. Parts Name Specifications Diagram mended PKFY-20VAM Unit Amount (Drawing No.) Symbol Q'ty PKFY-25VAM R01 22A 651 FRONT PANEL R01 22A 691 INTAKE GRILLE —...
Page 18 PKFY-20VAM ELECTRICAL PARTS PKFY-25VAM FILTER CHECK MODE TEST RUN Q'ty / set Price Wiring Recom- Remarks No. Parts No. Parts Name Specifications PKFY-20VAM Diagram mended Unit Amount (Drawing No.) Symbol Q'ty PKFY-25VAM R01 22A 530 NOZZLE ASSEMBLY R01 22A 002...
Page 19 PKFY-20VAM HEAT EXCHANGER PARTS PKFY-25VAM Q'ty / set Price Wiring Recom- Remarks Specifications PKFY- PKFY- No. Parts No. Parts Name Diagram mended Unit Amount (Drawing No.) 20VAM 25VAM Symbol Q'ty R01 22A 480 HEAT EXCHANGER R01 23A 480 R01 22A 470...
Page 20 HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100-8310 TELEX J24532 CABLE MELCO TOKYO CCopyright 1997 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD. New publication, effective Nov. 1998 Issued in Nov. 1998. No. OC112 251 Specifications subject to change without notice Issued in Mar. 1997. No. OC112 1600...

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Pkfy-25vam