Mitsubishi Electric PKFY Series Technical & Service Manual
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Mitsubishi Electric PKFY Series Technical & Service Manual

Mitsubishi Electric PKFY Series Technical & Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
[Model Name]
PKFY-P08NLMU-E
PKFY-P12NLMU-E
INDOOR UNIT
R410A
[Service Ref.]
PKFY-P12NLMU-E.TH
Model name
indication
Note:
• This manual describes
service data of the indoor
units only.
CONTENTS
1. SAFETY PRECAUTION .......................... 2
3. SPECIFICATION ................................... 12
4. NOISE CRITERION CURVES ............... 15
6. WIRING DIAGRAM ............................... 19
9. TROUBLESHOOTING .......................... 27
PARTS CATALOG (OCB715)
March 2020
No. OCH715

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  • Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS March 2020 No. OCH715 TECHNICAL & SERVICE MANUAL R410A Indoor unit Note: [Model Name] [Service Ref.] • This manual describes PKFY-P04NLMU-E.TH service data of the indoor PKFY-P04NLMU-E units only. PKFY-P06NLMU-E.TH PKFY-P06NLMU-E PKFY-P08NLMU-E.TH PKFY-P08NLMU-E PKFY-P12NLMU-E.TH PKFY-P12NLMU-E PKFY-P15NLMU-E.TH PKFY-P15NLMU-E PKFY-P18NLMU-E.TH...
  • Page 2 SAFETY PRECAUTION Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Do not use the existing refrigerant piping. valve. The old refrigerant and lubricant in the existing piping Vacuum pump oil may flow back into refrigerant cycle and contains a large amount of chlorine which may cause the that can cause deterioration of refrigerant oil, etc.
  • Page 3 [1] Cautions for service (1) Perform service after collecting the refrigerant left in the unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
  • Page 4 PARTS NAMES AND FUNCTIONS 2-1. Indoor unit Filter Air intake Front Panel Emergency operation switch Operation indicator lamp Louver Air outlet Vane Remote control receiving section 2-2. Wired Remote Controller <PAR-40MAA> Wired remote controller function The functions which can be used are restricted according to each model. : Supported : Unsupported PAR-40MAA...
  • Page 5 Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.
  • Page 6 Display The main display can be displayed in two different modes: “Full” and “Basic”. The factory setting is “Full”. To switch to the “Basic” mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) <Full mode>...
  • Page 7 Menu structure Main menu Press the button. MENU Move the cursor to the desired item with the buttons, and press the button. SELECT Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer...
  • Page 8 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Model name input Serial No. input Dealer information input Initialize maintenance info.
  • Page 9 Main menu list Main Setting and display items Setting details menu Operation Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting from 5 different settings. Use to turn ON/OFF the louver. •...
  • Page 10 Main Setting and display items Setting details menu Initial Basic Main/Sub When connecting 2 remote controllers, one of them needs to be designated setting setting as a sub controller. Clock Use to set the current time.　 Daylight Set the daylight saving time. saving time Administrator pass- The administrator password is required to make the settings for the following...
  • Page 11 2-3. Wireless remote controller Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button*...
  • Page 12 SPECIFICATION 3-1. SPECIFICATIONS Model PKFY-P04NLMU-E PKFY-P06NLMU-E PKFY-P08NLMU-E Power source 1-phase 208-230 V 60 Hz Cooling capacity (Nominal) BTU/h 4000 6000 8000 Power input 0.02 0.02 0.03 Current input A 0.20 0.20 0.25 Heating capacity (Nominal) BTU/h 4500 6700 9000 Power input 0.01 0.01 0.02...
  • Page 13 Model PKFY-P12NLMU-E PKFY-P15NLMU-E PKFY-P18NLMU-E Power source 1-phase 208-230 V 60 Hz Cooling capacity (Nominal) BTU/h 12000 15000 18000 Power input 0.04 0.04 0.05 Current input A 0.35 0.35 0.45 Heating capacity (Nominal) BTU/h 13500 17000 20000 Power input 0.03 0.03 0.04 Current input A 0.30...
  • Page 14 3-2. ELECTRICAL PARTS SPECIFICATIONS Service ref. PKFY-P04NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P18NLMU-E.TH Symbol Parts name Room temperature TH21 Resistance 32°F/15 k", 50°F/9.6 k", 68°F/6.3 k", 77°F/5.4 k", 86°F/4.3 k", 104°F/3.0 k" detection thermistor Pipe temperature TH22 Resistance 32°F/15 k", 50°F/9.6 k", 68°F/6.3 k", 77°F/5.4 k", 86°F/4.3 k", 104°F/3.0 k" detection thermistor/liquid Pipe temperature TH23...
  • Page 15 NOISE CRITERION CURVES NOISE CRITERION CURVES PKFY-P04NLMU-E PKFY-P06NLMU-E NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 Approximate minimum Approximate minimum audible limit on NC-20 NC-20 audible limit on continuous noise continuous noise 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
  • Page 16 PKFY-P15NLMU-E PKFY-P18NLMU-E NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 Approximate minimum Approximate minimum audible limit on audible limit on continuous noise NC-20 continuous noise NC-20 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz OCH715...
  • Page 17 OUTLINES AND DIMENSIONS PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH Unit: inch(mm) OCH715...
  • Page 18 PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH Unit: inch(mm) OCH715...
  • Page 19 WIRING DIAGRAM PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH NOTES: 1. At servicing for outdoor unit,always follow the wiring SYMBOL NAME SYMBOL NAME diagram of outdoor unit. INDOOR CONTROLLER BOARD TH21 THERMISTOR ROOM TEMP. DETECTION CN24 CONNECTOR EXTERNAL HEATER (0°C/15kΩ, 25°C/5.4kΩ) (32°F/15kΩ, 77°F/5.4kΩ) 2.
  • Page 20 REFRIGERANT SYSTEM DIAGRAM PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH Pipe temperature detection thermistor/gas (TH23) Gas pipe Gas distributor Strainer Flare Unit: inch (mm) (#50mesh) Gas pipe {1/2” (12.7) Pipe temperature detection thermistor/liquid (TH22) Liquid pipe {1/4” (6.35) Liquid pipe Strainer Liquid distributor Heat exchanger (#100mesh)
  • Page 21 Control Mode Control Details Remarks 1. Temperature 1-1. Determining temperature adjustment function • The ON/OFF commands by the indoor unit adjustment (Function to prevent restarting for 3 minutes) thermostatic control function • Room temperature ] Set temperature + 2°F ···Thermo-ON are not an ON/OFF •...
  • Page 22 8-2. DRY OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display DRY. 3 Press [F2] [F3] button to set the set temperature. RETURN SELECT MENU HOLD <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display DRY. 3 Press the TEMP.
  • Page 23 8-3. FAN OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display FAN. RETURN SELECT MENU HOLD <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display FAN. Control Mode Control Details Remarks 1. Temperature Set by remote controller.
  • Page 24 8-4. HEAT OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display HEAT. 3 Press [F2] [F3] button to set the set temperature. NOTE: The settable temperature range varies with the model of outdoor units and remote controller. RETURN SELECT MENU HOLD <How to operate>...
  • Page 25 Control Mode Control Details Remarks 2-1. Hot adjust mode "Heat Standby" will be displayed during the The fan controller becomes the hot adjuster mode for the following conditions. hot adjust mode. 1 When starting the HEAT operation 2 When the temperature adjustment function changes from OFF to ON. The step change 3 When release the HEAT defrosting operation of A to B will not be...
  • Page 26 8-5. AUTO OPERATION [AUTOMATIC COOL/HEAT CHANGE OVER OPERATION] <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display AUTO. 3 Press [F2] [F3] button to set the set temperature. NOTE: The settable temperature range varies with the model of outdoor units and remote controller. RETURN SELECT MENU HOLD...
  • Page 27 TROUBLESHOOTING 9-1. HOW TO CHECK THE PARTS PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. detection thermistor (TH21) (At the ambient temperature 10 to 30:) Pipe temperature detection thermistor/liquid (TH22) Normal Refer to “8-1-1.
  • Page 28 9-1-1. Thermistor <Thermistor characteristic graph> < Thermistor for lower temperature > Room temperature detection thermistor (TH21) Thermistor for Pipe temperature detection thermistor/liquid (TH22) lower temperature Pipe temperature detection thermistor/gas (TH23) Thermistor R =15 k" ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+(t-32)/1.8 30_F...
  • Page 29 9-1-3. DC Fan motor (fan motor/indoor controller board) Check method of indoor fan motor (fan motor/indoor controller board) Notes · High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service. · Do not pull out the connecter (CNMF) for the motor with the power supply on. (It causes trouble of the indoor controller board and fan motor.) Self check Conditions : The indoor fan cannot rotate.
  • Page 30 <Output pulse signal and the valve operation> The output pulse shifts in below order. Output Output Closing a valve : 1 → 2 → 3 → 4 → 1 (Phase) Opening a valve : 4 → 3 → 2 → 1 → 4 •...
  • Page 31 9-2. FUNCTION OF DIP SWITCH PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH The black square ( ) indicates a switch position. Operation by switch Effective Switch Pole Function Remarks timing Thermistor Built-in remote <Intake temperature Indoor unit Address board controller detection> position <Initial setting>...
  • Page 32 The black square ( ) indicates a switch position. Effective Switch Pole Function Remarks timing SW11 SW12 SW11 Address setting should be done when M-NET Address board 1s digit remote controller is being used. address <Initial setting> setting SW12 SW11 SW12 10s digit Before...
  • Page 33 9-3. TEST POINT DIAGRAM 9-3-1. Indoor controller board (I.B) PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH CN24 CN105 CN2M LED1 External heater IT Terminal M-NET transmission connecting wire Vane motor (MV1,MV2) Main power supply 24 − 30 VDC (non-polar) 12 VDC pulse output (Indoor unit : 208/230 V AC) CN60 Linear expansion valve(LEV)
  • Page 34 9-3-2. PCB FOR WIRELESS REMOTE CONTROLLER (W.B), SWITCH BOARD (S.B) and LED BOARD (L.B) PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH PCB FOR WIRELESS SWITCH BOARD (S.B) LED BOARD (L.B) REMOTE CONTROLLER (W.B) SWE1 Emergency operation (HEAT) SWE2 CN302 REC1 Emergency operation (COOL) Connect to Receiving unit INDOOR...
  • Page 35 DISASSEMBLY PROCEDURE PKFY-P04NLMU-E.TH PKFY-P06NLMU-E.TH PKFY-P08NLMU-E.TH PKFY-P12NLMU-E.TH PKFY-P15NLMU-E.TH PKFY-P18NLMU-E.TH Be careful when removing heavy parts. : Indicates the visible parts in the photos/figures. NOTE: Turn OFF the power supply before assembly. : Indicates the invisible parts in the photos/figures. OPERATION PROCEDURE PHOTOS/FIGURES 1.
  • Page 36 OPERATION PROCEDURE PHOTOS/FIGURES 3. REMOVING THE ADDRESS BOARD, THE INDOOR Photo 4 CONTROLLER BOARD, THE WIRELESS Holder of wireless remote CONTROLLER BOARD, LED BOARD Switch board holder controller board and LED board (Holder of switch board) (1) Remove the panel and the corner box. (Refer to procedure 1) Address board (2) Remove the front and side electrical box covers (each 2...
  • Page 37 OPERATION PROCEDURE PHOTOS/FIGURES 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 8 LINE FLOW FAN Lead wire of pipe thermistor (1) Remove the panel and the corner box. (Refer to procedure 1) (2) Remove the electrical box (Refer to procedure 2) and the Motor band nozzle assembly (Refer to procedure 4).
  • Page 38 (4) Disconnect the connector (CN20) on the indoor controller board. Indoor controller board Room temp. thermistor (TH21) HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN cCopyright 2020 MITSUBISHI ELECTRIC CORPORATION Published: Mar. 2020 No. OCH715 Made in Japan Specifications are subject to change without notice.

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