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Mitsubishi Electric CITY MULTI Series Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
[Service Ref.]
PKFY-P24NKMU-E2.TH
PKFY-P24NKMU-E2
PKFY-P30NKMU-E2.TH
PKFY-P30NKMU-E2
R410A
R22
Note:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
CONTENTS
2. SPECIFICATION ..................................... 4
4. WIRING DIAGRAM ................................. 7
7. TROUBLESHOOTING .......................... 14
8. DISASSEMBLY PROCEDURE ............. 21
PARTS CATALOG (OCB518)
April 2012
No. OCH518

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Summary of Contents for Mitsubishi Electric CITY MULTI Series

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS April 2012 No. OCH518 TECHNICAL & SERVICE MANUAL R410A Indoor unit Note: [Model names] [Service Ref.] • This manual describes only service data of the indoor PKFY-P24NKMU-E2.TH PKFY-P24NKMU-E2 units. • RoHS compliant products have <G> mark on the spec PKFY-P30NKMU-E2.TH PKFY-P30NKMU-E2 name plate.

  • Page 2: Part Names And Functions

    Use the specifi ed refrigerant only. Never use any refrigerant other than that specifi ed. Doing so may cause a burst, an explosion, or fi re when the unit is being used, serviced, or disposed of. Correct refrigerant is specifi ed in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
  • Page 3 Wired remote controller Note: The phrase "Wired remote controller" in this manual refers only to the PAR-21MAA. If you need any information for the other remote controller, please refer to either the installation manual or initial setting manual which are included in remote controller's box.

  • Page 4: Specification

    SPECIFICATION 2-1. Specifi cations PKFY-P30NKMU-E2 PKFY-P24NKMU-E2 Model Power source 1-phase 208-230V 60Hz Cooling capacity (Nominal) Btu/h 24,000 30,000 0.07 0.07 Power input 0.50 0.50 Current input Heating capacity 10.0 (Nominal ) Btu/h 27,000 34,000 0.07 0.07 Power input 0.50 0.50 Current input External finish Plastic, MUNSELL (1.0Y 9.2/0.2)
  • Page 5 2-2. Electrical parts specifi cations Service Ref. Symbol PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH Parts name Room temperature Resistance 30°F/15.8k , 50°F/9.6k , 70°F/6.0k , 80°F/4.8k , 90°F/3.9k , 100°F/3.2k TH21 thermistor Liquid pipe thermistor Resistance 30°F/15.8k , 50°F/9.6k , 70°F/6.0k , 80°F/4.8k , 90°F/3.9k , 100°F/3.2k TH22 TH23 Resistance 30°F/15.8k , 50°F/9.6k , 70°F/6.0k , 80°F/4.8k , 90°F/3.9k , 100°F/3.2k...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PKFY-P24NKMU-E2.TH Unit : inch (mm) Top side 16-11/16(423.7) 17(431.7) PKFY-P30NKMU-E2.TH Left side Right side Front side Mount board Knockout hole for left piping 9-1/2(241) 2-29/32(74) 33-21/32(855) 3/16(5) 11-5/8(295) 46-1/16(1170) Operation lamp Front side(Grille open) Knockout hole for right piping DEFROST/STAND BY lamp Receiver Terminal block for power supply...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH OCH518...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH Gas pipe thermistor (1) TH23 Strainer (#50mesh) Gas pipe Gas pipe thermistor (2) TH24 Flare connection Liquid pipe thermistor TH22 Heat exchanger Liquid pipe Linear expansion valve Strainer1 (#50mesh) Room temparature thermistor TH21 Strainer2 (#100mesh) Strainer (#100mesh) Unit : mm (inch) Model...

  • Page 9: Microprocessor Control

    MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 6-1. COOL OPERATION <How to operate> Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER Press the operation MODE button to display COOL. ERROR CODE FUNCTION û Fû C FILTER û...
  • Page 10 6-2. DRY OPERATION <How to operate> Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER Press the operation MODE button to display DRY. ERROR CODE FUNCTION û Fû C FILTER û Fû C WEEKLY Press the TEMP.
  • Page 11 6-3. FAN OPERATION <How to operate> Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT Press the operation MODE button to display FAN. TIMER AFTER AFTER ERROR CODE FUNCTION û Fû C FILTER û Fû C WEEKLY SIMPLE ONLY1Hr.
  • Page 12 6-4. HEAT OPERATION <How to operate> Press POWER ON/OFF button. Press the operation MODE button to display HEAT. TIME SUN MON TUE WED THU FRI SAT Press the TEMP. button to set the desired temperature. TIMER AFTER AFTER ERROR CODE FUNCTION NOTE: The set temperature changes 2°F when the button is...
  • Page 13 From the preceding page Control modes Control details Remarks 2-3. Thermo OFF mode 2. Fan When the thermostat function changes to OFF, the indoor fan operates in [Extra low]. 2-4. Heat defrosting mode The indoor fan stops. (1) Initial setting: OFF HEAT···[last setting] 3.

  • Page 14: Troubleshooting

    TROUBLESHOOTING 7-1. HOW TO CHECK THE PARTS PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH21) (At the ambient temperature 50°F~86°F) Liquid pipe temperature Normal Abnormal thermistor (TH22) Refer to 7-1-1. 4.3k ~9.6k Open or short Gas pipe temperature...
  • Page 15 <Output pulse signal and the valve operation> Closing a valve : 1 Output Output Opening a valve : 4 (Phase) The output pulse shifts in above order. Note: • When linear expansion valve operation stops, all output phase become OFF. •...
  • Page 16 7-1-3. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNMF) for the motor with the power supply on. board and fan motor.) (It causes trouble of the indoor controller circuit Self check...
  • Page 17 7-2. Function of Dip switch PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH Operation by switch Effective Switch Pole Function Remarks timing Thermistor<Room temperature> Built-in remote controller Indoor unit Address board position Filter clogging detection Provide Not provide <Initial setting> Filter cleaning sign 2,500 hr 100 hr 1 2 3 4 5 6 7 8 9 10 Fresh air intake Not effective...
  • Page 18 Effective Operation by switch Remarks Switch timing SW11 SW12 SW11 How to set addresses Address board 1s digit Example : If address is "3", remain SW12 address <Initial setting> (for over 10) at "0", and match SW11 (for 1 to 9) setting SW12 SW11...
  • Page 19 7-3. TEST POINT DIAGRAM CNMF Connect to the fan motor (MF) Power supply for 7-3-1. Indoor controller board 1-3 : DC294~325V indoor controller board 4-3 : DC15V 1-3 : 208/230VAC PKFY-P24NKMU-E2.TH 5-3 : DC0~6V PKFY-P30NKMU-E2.TH 6-3 : DC0 or DC15V (Stop) FUSE DC7.5V (Operation) 3.15A 250V...
  • Page 20 7-3-2. Wireless remote controller board PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH CN301 Connect to the indoor controller board (I.B) 7-3-3. Address board PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH Function setting 1 2 3 4 5 6 7 8 9 10 SW12 SW11 SW14 Address setting Address setting Branch No. 10ths DIGIT 1s DIGIT OCH518...

  • Page 21: Disassembly Procedure

    DISASSEMBLY PROCEDURE PKFY-P24NKMU-E2.TH PKFY-P30NKMU-E2.TH Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. REMOVING THE PANEL Photo 1 Front grille Screws (1) Press and unlock the knobs on both sides of the front grille and lift the front grille until it is level. Pull the hinges forward to remove the front grille.
  • Page 22 OPERATION PROCEDURE PHOTOS 3. REMOVING THE ELECTRICAL BOX Photo 4 Connect for ground Fixture (1) Remove the panel and the corner box. (Refer to procedure 1) (2) Remove the screw and hook of address board case. (3) Remove the front and side electrical box covers (each 1 screw).
  • Page 23 OPERATION PROCEDURE PHOTOS 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 7 LINE FLOW FAN Screw of the motor band (1) Remove the panel and the corner box. (Refer to procedure Lead wire of pipe thermistor (2) Remove the electrical box (Refer to procedure 2) and the nozzle assembly (Refer to procedure 3).
  • Page 24 Room temp. thermistor (TH21) HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Apr. 2012 No. OCH518 New publication, effective Apr. 2012 Made in Japan Specifications are subject to change without notice.

This manual is also suitable for:

Pkfy-p24nkmu-e2Pkfy-p30nkmu-e2City multi pkfy-p24nkmu-e2City multi city pkfy-p30nkmu-e2Multi pkfy-p24nkmu-e2.thCity multi pkfy-p30nkmu-e2.th

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