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Mitsubishi Electric PLFY-P12NBMU-E Technical & Service Manual
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Mitsubishi Electric PLFY-P12NBMU-E Technical & Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
[Model names]
Model name
indication
INDOOR UNIT
[Service Ref.]
PLFY-P12NBMU-E
PLFY-P15NBMU-E
PLFY-P18NBMU-E
PLFY-P24NBMU-E
PLFY-P30NBMU-E
PLFY-P36NBMU-E
Get other manuals https://www.bkmanuals.com
November 2008
REVISED EDITION-A
R410A / R22
Revision:
• PLFY-P12/15/18/24/30/36
NBMU-ER1 are added in
REVISED EDITION-A.
• Some descriptions have
been modified.
• Plase void OCH421.
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.
CONTENTS
1. TECHNICAL CHANGES ......................... 2
2. FEATURES ............................................. 2
4. SPECIFICATIONS ................................... 5
5. 4-WAY AIR FLOW SYSTEM ................... 9
7. WIRING DIAGRAM ............................... 13
10. TROUBLESHOOTING ......................... 22
11. DISASSEMBLY PROCEDURE ............. 31
PARTS CATALOG (OCB421)
No. OCH421

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS November 2008 No. OCH421 REVISED EDITION-A TECHNICAL & SERVICE MANUAL R410A / R22 Indoor unit [Model names] [Service Ref.] Revision: PLFY-P12NBMU-E PLFY-P12NBMU-E • PLFY-P12/15/18/24/30/36 NBMU-ER1 are added in PLFY-P12NBMU-ER1 REVISED EDITION-A. PLFY-P15NBMU-E PLFY-P15NBMU-E • Some descriptions have been modified.

  • Page 2: Indoor Unit

    TECHNICAL CHANGES 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. FEATURES Models Cooling capacity / Heating capacity PLFY-P12NBMU-E 12,000 / 13,500 Btu/h PLFY-P15NBMU-E 15,000 / 17,000 Btu/h PLFY-P18NBMU-E 18,000 / 20,000 Btu/h...

  • Page 3: 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 Operation Section ON/OFF button Temperature setting buttons Down Fan Speed button Timer Menu button (Monitor/Set button) Filter button...
  • Page 4 Wired remote controller Display Section “Sensor” indication Day-of-Week 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 5: Specifications

    SPECIFICATIONS 4-1. SPECIFICATIONS PLFY-P18NBMU-E PLFY-P12NBMU-E PLFY-P15NBMU-E Model PLFY-P12NBMU-ER1 PLFY-P15NBMU-ER1 PLFY-P18NBMU-ER1 Power source 1-phase 208-230V 60Hz BTU/h 12,000 15,000 18,000 Cooling capacity (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 20,000 kcal/h (Nominal ) Power input 0.02...
  • Page 6 PLFY-P24NBMU-E PLFY-P30NBMU-E PLFY-P36NBMU-E Model PLFY-P24NBMU-ER1 PLFY-P30NBMU-ER1 PLFY-P36NBMU-ER1 Power source 1-phase 208-230V 60Hz 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 Power input 0.05...
  • Page 7 4-2. SOUND LEVEL PLFY-P-NBMU-E Sound level at anechoic room : Low- Mid2-Mid1 -High Sound level dB (A) PLFY-P12NBMU-E 27-28-29-31 PLFY-P12NBMU-ER1 PLFY-P15NBMU-E 27-28-30-31 PLFY-P15NBMU-ER1 PLFY-P18NBMU-E 28-29-30-32 PLFY-P18NBMU-ER1 PLFY-P24NBMU-E 28-30-32-34 PLFY-P24NBMU-ER1 PLFY-P30NBMU-E 30-32-35-37 PLFY-P30NBMU-ER1 PLFY-P36NBMU-E Measurement location 35-38-41-43 PLFY-P36NBMU-ER1 * Measured in anechoic room.
  • Page 8 4-4. ELECTRICAL PARTS SPECIFICATIONS Service Ref. PLFY-P12NBMU-E PLFY-P15NBMU-E PLFY-P18NBMU-E PLFY-P24NBMU-E PLFY-P30NBMU-E PLFY-P36NBMU-E Symbol PLFY-P12NBMU-ER1 PLFY-P15NBMU-ER1 PLFY-P18NBMU-ER1 PLFY-P24NBMU-ER1 PLFY-P30NBMU-ER1 PLFY-P36NBMU-ER1 Parts name Room temperature TH21 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 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...

  • Page 9: 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 10 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 11 5-4. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS 1 PLFY-P12 · P18 · P24 · P30NBMU-E(R1) Multifunction casement + High efficiency filter Multifunction casement + Standard filter 50(20) 50(20) -50(-20) -50(-20) 2 - inlet 2 - inlet -100(-40) -100(-40) -150(-60) -150(-60) 1 - inlet...

  • Page 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PLFY-P12NBMU-E(R1) PLFY-P15NBMU-E(R1) PLFY-P18NBMU-E(R1) Unit : inch (mm) PLFY-P24NBMU-E(R1) PLFY-P30NBMU-E(R1) PLFY-P36NBMU-E(R1) Ceiling hole 25/32~1-25/32(20~45) 33-27/32 to 35-13/16(860~910) 25/32 to 1-25/32(20~45) Detail connecting of branch duct (Both aspects) 31-7/8(810) Fresh air 3-15/16 (100) 3-15/16 (100) Suspension bolt pitch 6-16/5...

  • Page 13: Wiring Diagram

    WIRING DIAGRAM PLFY-P12NBMU-E(R1) PLFY-P15NBMU-E(R1) PLFY-P18NBMU-E(R1) PLFY-P24NBMU-E(R1) PLFY-P30NBMU-E(R1) PLFY-P36NBMU-E(R1) < 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...

  • Page 14: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLFY-P12NBMU-E(R1) PLFY-P15NBMU-E(R1) PLFY-P18NBMU-E(R1) PLFY-P24NBMU-E(R1) PLFY-P30NBMU-E(R1) PLFY-P36NBMU-E(R1) 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)

  • Page 15: 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 16 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 17 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 18 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 19 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 20 From the preceding page Control modes Control details Remarks 2-3. Thermo OFF mode 2. Fan When the thermoregulating 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 21 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 22: 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 Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH21) (At the ambient temperature 50 F~86 F) Liquid pipe thermistor (TH22) Normal Abnormal (Refer to the next page for a detail.) Gas pipe thermistor 4.3k ~9.6k...
  • Page 23 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 24 <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 25 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 26 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 100hr 1 2 3 4 5 6 7 8 9 10 Note : Fresh air intake Effective...
  • Page 27 Effective Switch Pole Operation by switch Remarks timing Address board * Ceiling height can be changed depending on SWB setting. (High ceiling) <Initial setting> Ceiling (Standard) height PLFY-P12·P15·P18·P24·P30NBMU-E(R1) selector (Silent) Silent Standard High ceiling 4 direction 2.5m, 8.2ft 2.7m, 8.9ft 3.5m, 11.5ft 3 direction 2.7m, 8.9ft...
  • Page 28 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 29 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 CN6Y CN60 i-see sensor motor output Linear expansion valve (LEV) 12VDC pulse output output 12VDC pulse output CN3A Connect to the terminal block (TB15) CN4Y (MA-Remote controller connecting wire) i-See sensor 1 - 3 : 8.7-13V DC (Pin1 (+)) CN52 Remote indicator...
  • Page 30 10-3-2. Circuit board PLFY-P12NBMU-E(R1) PLFY-P15NBMU-E(R1) PLFY-P18NBMU-E(R1) PLFY-P24NBMU-E(R1) PLFY-P30NBMU-E(R1) PLFY-P36NBMU-E(R1) Ceiling height Discharge outlet Function setting number selector selector SW12 SW11 Address setting Address setting Option selector 2nd digit 1st digit Get other manuals https://www.bkmanuals.com...

  • Page 31: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLFY-P12NBMU-E(R1) PLFY-P15NBMU-E(R1) PLFY-P18NBMU-E(R1) PLFY-P24NBMU-E(R1) PLFY-P30NBMU-E(R1) PLFY-P36NBMU-E(R1) 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.
  • Page 32 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 33 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 6) (3) Remove the 2 wiring clamps.
  • Page 34 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 10 11. Removing the heat exchanger Linear expansion Heat exchanger (1) Remove the drain pan. (See Photo 6) valve (2) Remove the 3 screws of the piping cover, and pull out piping cover. Piping cover (3) Remove the 2 screws of coil plate.
  • Page 35 Get other manuals https://www.bkmanuals.com...
  • Page 36 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN cCopyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Nov. 2008 Distributed in Nov. 2008 No. OCH421 REVISED EDITION-A PDF 7 Specifications subject to change without notice Distributed in Jul. 2007 No. OCH421 PDF 9 Made in Japan Get other manuals https://www.bkmanuals.com...

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