Mitsubishi PLFY-P12NBMU-E Technical & Service Manual
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Mitsubishi PLFY-P12NBMU-E 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.]
PLFY-P12NBMU-E
PLFY-P12NBMU-E
PLFY-P12NBMU-ER2
PLFY-P15NBMU-E
PLFY-P15NBMU-E
PLFY-P15NBMU-ER2
PLFY-P18NBMU-E
PLFY-P18NBMU-E
PLFY-P18NBMU-ER2
PLFY-P24NBMU-E
PLFY-P24NBMU-E
PLFY-P24NBMU-ER2
PLFY-P30NBMU-E
PLFY-P30NBMU-E
PLFY-P30NBMU-ER2
PLFY-P36NBMU-E
PLFY-P36NBMU-E
PLFY-P36NBMU-ER2
Model name
indication
INDOOR UNIT
R410A / R22
PLFY-P12NBMU-ER1
PLFY-P15NBMU-ER1
PLFY-P18NBMU-ER1
PLFY-P24NBMU-ER1
PLFY-P30NBMU-ER1
PLFY-P36NBMU-ER1
CONTENTS
1. TECHNICAL CHANGES ......................... 2
2. FEATURES ............................................. 3
4. SPECIFICATIONS ................................... 6
5. 4-WAY AIR FLOW SYSTEM ................. 10
7. WIRING DIAGRAM ............................... 14
10. TROUBLESHOOTING ......................... 24
11. DISASSEMBLY PROCEDURE ............. 33
PARTS CATALOG (OCB421)
April 2012
No. OCH421
REVISED EDITION-B
Revision:
• PLFY-P12/15/18/24/30/36
NBMU-ER2 have been
added in REVISED
EDITION-B.
• Some descriptions have
been modified.
• Please void OCH421
REVISED EDNTION-A.
Note:
• This manual does not
cover outdoor units.
When servicing them,
please refer to the outdoor
unit's service manual.
• RoHS compliant products
have <G> mark on the
spec name plate.

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Summary of Contents for Mitsubishi PLFY-P12NBMU-E

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS April 2012 No. OCH421 REVISED EDITION-B TECHNICAL & SERVICE MANUAL R410A / R22 Indoor unit [Model names] [Service Ref.] Revision: PLFY-P12NBMU-E PLFY-P12NBMU-ER1 PLFY-P12NBMU-E • PLFY-P12/15/18/24/30/36 NBMU-ER2 have been PLFY-P12NBMU-ER2 added in REVISED PLFY-P15NBMU-E PLFY-P15NBMU-ER1 PLFY-P15NBMU-E EDITION-B.

  • Page 2: Technical Changes

    PLFY-P12NBMU-ER2 PLFY-P15NBMU-ER1 PLFY-P15NBMU-ER2 PLFY-P18NBMU-ER1 PLFY-P18NBMU-ER2 PKFY-P24NBMU-ER1 PLFY-P24NBMU-ER2 PKFY-P30NBMU-ER1 PLFY-P30NBMU-ER2 PKFY-P36NBMU-ER1 PLFY-P36NBMU-ER2 INDOOR CONTROLLER BOARD (I.B.) has been changed (S/W version up). PLFY-P12NBMU-E PLFY-P12NBMU-ER1 PLFY-P15NBMU-E PLFY-P15NBMU-ER1 PLFY-P18NBMU-E PLFY-P18NBMU-ER1 PKFY-P24NBMU-E PLFY-P24NBMU-ER1 PKFY-P30NBMU-E PLFY-P30NBMU-ER1 PKFY-P36NBMU-E PLFY-P36NBMU-ER1 INDOOR CONTROLLER BOARD (I.B.) has been changed.

  • Page 3: Features

    4. i-see Sensor (OPTIONAL CORNER PANEL) The i see sensor is a radiation temperature sensor originated from Mitsubishi’s new technology. In order to create a really comfortable space in shops and offices, it is essential to control the temperature near the floor where occupants/visitors gather.

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor unit Drain pipe Filter Air outlet Liquid pipe Gas pipe i-see sensor (option) Vane Air intake (Intake grille) 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 5: Wired Remote Controller

    Wired remote controller Display Section Day-of-Week “Sensor” indication For purposes of this explanation, Shows the current day of the week. Displayed when the remote controller all parts of the display are shown sensor is used. as lit. During actual operation, only the relevant items will be lit.

  • Page 6: Specifications

    SPECIFICATIONS 4-1. SPECIFICATIONS PLFY-P12NBMU-E PLFY-P15NBMU-E PLFY-P18NBMU-E PLFY-P12NBMU-ER1 PLFY-P15NBMU-ER1 PLFY-P18NBMU-ER1 Model PLFY-P12NBMU-ER2 PLFY-P15NBMU-ER2 PLFY-P18NBMU-ER2 Power source 1-phase 208-230V 60Hz BTU/h Cooling capacity 12,000 15,000 18,000 (Nominal) Power input 0.03 0.04 0.05 Current input 0.22 0.29 0.36 Btu/h Heating capacity 13,500 17,000...
  • Page 7 PLFY-P24NBMU-E PLFY-P30NBMU-E PLFY-P36NBMU-E Model PLFY-P24NBMU-ER1 PLFY-P30NBMU-ER1 PLFY-P36NBMU-ER1 PLFY-P24NBMU-ER2 PLFY-P30NBMU-ER2 PLFY-P36NBMU-ER2 1-phase 208-230V 60Hz Power source BTU/h Cooling capacity 24,000 30,000 36,000 (Nominal) 10.5 Power input 0.06 0.07 0.16 Current input 0.43 0.51 1.07 Btu/h Heating capacity 27,000 34,000 40,000 kcal/h (Nominal ) 10.0 11.7...

  • Page 8: Sound Level

    4-2. SOUND LEVEL Sound level at anechoic room : Low- Mid2-Mid1 -High Sound level dB (A) PLFY-P-NBMU-E PLFY-P12NBMU-E PLFY-P12NBMU-ER1 27-28-29-31 PLFY-P12NBMU-ER2 PLFY-P15NBMU-E PLFY-P15NBMU-ER1 27-28-30-31 PLFY-P15NBMU-ER2 PLFY-P18NBMU-E PLFY-P18NBMU-ER1 28-29-30-32 PLFY-P18NBMU-ER2 PLFY-P24NBMU-E PLFY-P24NBMU-ER1 28-30-32-34 PLFY-P24NBMU-ER2 PLFY-P30NBMU-E PLFY-P30NBMU-ER1 30-32-35-37 PLFY-P30NBMU-ER2 PLFY-P36NBMU-E Measurement location...
  • Page 9 4-4. ELECTRICAL PARTS SPECIFICATIONS PLFY-P12NBMU-E PLFY-P15NBMU-E PLFY-P18NBMU-E PLFY-P24NBMU-E PLFY-P30NBMU-E PLFY-P36NBMU-E Service Ref. Symbol PLFY-P12NBMU-ER1 PLFY-P15NBMU-ER1 PLFY-P18NBMU-ER1 PLFY-P24NBMU-ER1 PLFY-P30NBMU-ER1 PLFY-P36NBMU-ER1 PLFY-P12NBMU-ER2 PLFY-P15NBMU-ER2 PLFY-P18NBMU-ER2 PLFY-P24NBMU-ER2 PLFY-P30NBMU-ER2 PLFY-P36NBMU-ER2 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...

  • Page 10: Way Air Flow System

    4-WAY AIR FLOW SYSTEM 5-1. PLACEMENT OF THE AIR OUTLETS • For this grille, the blowout direction comes in 11 patterns. Also, by setting the remote controller to the appropriate settings, you can adjust the air flow and speed. Select the settings from Table1 according to the location in which you want to install the unit.
  • Page 11 5-2. BRANCH DUCT HOLE AND FRESH AIR INTAKE HOLE At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required. • A fresh air intake hole for the optional multi function casement can also be made. Note: The figures marked with * in the drawing below represent the dimensions of the main unit excluding those of the optional multi function casement.
  • Page 12 5-4. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS PLFY-P12 · P18 · P24 · P30NBMU-E, PLFY-P12 · P18 · P24 · P30NBMU-ER1 PLFY-P12 · P18 · P24 · P30NBMU-ER2 Multifunction casement + High efficiency filter Multifunction casement + Standard filter 50(20) 50(20) -50(-20)

  • Page 13: Outlines And Dimensions

    Otherwise condensation and dripping may occur. (It becomes the cause of dew drops/water dew.) 8. As for necessary installation/service space, please refer to the left figure. Indoor unit Service ref. PLFY-P12NBMU-E Refrigerant pipe ···ø12.7 Refrigerant pipe PLFY-P12NBMU-ER1 Flared connection ···1/2F ···ø6.35...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM PLFY-P12/15/18/24/30/36NBMU-E PLFY-P12/15/18/24/30/36NBMU-ER1 The black square ( ) indicates a switch position. < 1> POWER SUPPLY (RED) ~/N 208-230V 60Hz MODELS MODELS ADDRESS TO OUTDOOR UNIT CN43 BC CONTROLLER GRILLE REMOTE CONTROLLER BREAKER DC24-30V (16A) 1 2 3 4 5 6 1 2 3 4 5 6 (SHIELD) 1 2 3 4 5 6 7 8 910...
  • Page 15 PLFY-P12/15/18/24/30/36NBMU-ER2 The black square ( ) indicates a switch position. < 1> MODELS MODELS POWER SUPPLY (RED) ADDRESS ~/N 208-230V 60Hz TO OUTDOOR UNIT CN43 BC CONTROLLER GRILLE 1 2 3 4 5 6 BREAKER 1 2 3 4 5 6 REMOTE CONTROLLER (16A) DC24-30V...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLFY-P12/15/18/24/30/36NBMU-E PLFY-P12/15/18/24/30/36NBMU-ER1 PLFY-P12/15/18/24/30/36NBMU-ER2 Refrigerant flow in cooling Refrigerant flow in heating Strainer (#100mesh) Gas pipe thermistor TH23 Gas pipe Liquid pipe thermistor TH22 Flare connection Liquid pipe Heat exchanger Linear expansion valve Strainer1 (#50mesh) Strainer2 (#100mesh) Strainer (#100mesh) Room temparature thermistor TH21 Unit : mm (inch) PLFY-P36NBMU-E...

  • Page 17: Microprocessor Control

    MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 9-1. COOL OPERATION <How to operate> 1 Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER 2 Press the operation MODE button to display COOL. ERROR CODE FUNCTION û Fû C FILTER û...
  • Page 18 From the preceding page. Control modes Remarks Control details 3. Drain pump 3-1. Drain pump control •Always drain pump ON during the COOL and DRY mode operation. (Regardless of the thermo ON/OFF) •When the operation mode has changed from the COOL or DRY to the others (including Stop), OFF the control after the drain pump ON for 3 minutes.

  • Page 19: Dry Operation

    9-2. DRY OPERATION <How to operate> 1 Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER 2 Press the operation MODE button to display DRY. ERROR CODE FUNCTION û Fû C FILTER û Fû C 3 Press the TEMP.

  • Page 20: Fan Operation

    9-3. FAN OPERATION <How to operate> 1 Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT 2 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 21: Heat Operation

    9-4. HEAT OPERATION <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display HEAT. TIME SUN MON TUE WED THU FRI SAT 3 Press the TEMP. button to set the desired temperature. TIMER AFTER AFTER ERROR CODE FUNCTION...
  • Page 22 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. 3-1. Drain pump control 3.

  • Page 23: When Unit Is Stopped Control Mode

    9-5. AUTO OPERATION [AUTOMATIC COOL/HEAT CHANGE OVER OPERATION] <How to operate> 1 Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT 2 Press the operation MODE button to display AUTO. TIMER AFTER AFTER ERROR CODE FUNCTION 3 Press the TEMP. button to set the desired temperature. û...

  • Page 24: Troubleshooting

    TROUBLESHOOTING 10-1. HOW TO CHECK THE PARTS PLFY-P12/15/18/24/30/36NBMU-E PLFY-P12/15/18/24/30/36NBMU-ER1 PLFY-P12/15/18/24/30/36NBMU-ER2 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 thermistor (TH22) Normal Abnormal Gas pipe thermistor (Refer to the next page for a detail.)
  • Page 25 10-1-1. Thermistor <Thermistor characteristic graph> < Thermistor for lower temperature > Room temperature thermistor (TH21) Thermistor for Liquid pipe temperature thermistor (TH22) lower temperature Gas pipe temperature thermistor (TH23) Thermistor R =15k' ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+(t-32)/1.8 30_F...
  • Page 26 <Output pulse signal and the valve operation> Closing a valve : 1 → 2 → 3 → 4 → 1 Output Output Opening a valve : 4 → 3 → 2 → 1 → 4 (Phase) The output pulse shifts in above order. Note: •...
  • Page 27 10-1-3. 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 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. (It causes trouble of the indoor controller board and fan motor) Self check Conditions : The indoor fan cannot turn around.
  • Page 28 The black square (■) indicates a switch position. 10-2. FUNCTION OF DIP SWITCH Operation by switch Effective Switch Pole Function Remarks timing Thermistor <Room temperature Address board Built-in remote controller Indoor unit detection> position <Initial setting> Filter clogging detection Provided Not provided Filter cleaning 2,500hr...
  • Page 29 The black square (■) indicates a switch position. Effective Switch Pole Operation by switch Remarks timing Address board * Ceiling height can be changed depending on SWB setting. (High ceiling) <Initial setting> PLFY-P12·P15·P18·P24·P30NBMU-E Ceiling (Standard) PLFY-P12·P15·P18·P24·P30NBMU-ER1 height PLFY-P12·P15·P18·P24·P30NBMU-ER2 selector (Silent) Silent Standard High ceiling...
  • Page 30 Effective Switch Pole Operation by switch Remarks timing Indoor controller board • To operate each indoor unit by each remote controller when installed 2 indoor units or more are near, Pair No. setting is necessary. Pair No. setting is available with the 4 patterns (Setting patters A to D). Make setting for J41, J42 of indoor controller board and the Pair No.
  • Page 31 10-3. TEST POINT DIAGRAM 10-3-1. Indoor controller board PLFY-P12/15/18/24/30/36NBMU-E PLFY-P12/15/18/24/30/36NBMU-ER1 PLFY-P12/15/18/24/30/36NBMU-ER2 CN60 CN6Y CN3A CN4Y Linear expansion valve (LEV) i-see sensor motor output Connect to the terminal block (TB15) i-See sensor 12VDC pulse output (MA-Remote controller connecting wire) output 12VDC pulse output 1 - 3 : 8.7-13V DC (Pin1 (+)) CN52 Remote indicator...
  • Page 32 10-3-2. Circuit board PLFY-P12/15/18/24/30/36NBMU-E PLFY-P12/15/18/24/30/36NBMU-ER1 PLFY-P12/15/18/24/30/36NBMU-ER2 Ceiling height Discharge outlet Function setting selector number selector SW12 SW11 Address setting Address setting Option selector 10ths digit 1s digit OCH421B...

  • Page 33: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLFY-P12/15/18/24/30/36NBMU-E PLFY-P12/15/18/24/30/36NBMU-ER1 PLFY-P12/15/18/24/30/36NBMU-ER2 Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the air intake grille Figure 1 Filter (1) Slide the knob of air intake grille toward the arrow 1 to open the air intake grille. (2) Remove drop prevention hook from the panel.
  • Page 34 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 3 6. Removing the fan and fan motor (MF) (1) Remove the electrical box. (See Photo 2) Coil plate (2) Remove the bell mouth (3 screws). (See Photo 2) (3) Remove the turbo fan nut. (4) Pull out the turbo fan.
  • Page 35 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 7 9. Removing the liquid pipe temperature thermistor (TH22) Gas pipe temp. thermistor (TH23) and gas pipe temperature thermistor (TH23) (1) Remove the drain pan. (See Photo 6) (2) Remove the turbo fan. (Refer to procedure 6) (3) Remove the 2 wiring clamps.
  • Page 36 (6) Pull out the heat exchanger. Coil support HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN cCopyright 2007 MITSUBISHI ELECTRIC CORPORATION Distributed in Apr. 2012 No. OCH421 REVISED EDITION-B New publication, effective Apr. 2012 Distributed in Nov. 2008 No. OCH421 REVISED EDITION-A PDF 7 Specifications are subject to change without notice.

This manual is also suitable for:

Plfy-p15nbmu-ePlfy-p24nbmu-ePlfy-p30nbmu-ePlfy-p36nbmu-ePlfy-p18nbmu-e

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