Mitsubishi Electric CITY MULTI Series Technical & Service Manual
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Mitsubishi Electric CITY MULTI Series Technical & Service Manual

Mitsubishi Electric CITY MULTI Series Technical & Service Manual

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INDOOR UNIT FOR VRF SYSTEM
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model Name]
PLFY-P08NEMU-E
PLFY-P12NEMU-E
PLFY-P15NEMU-E
PLFY-P18NEMU-E
PLFY-P24NEMU-E
PLFY-P30NEMU-E
PLFY-P36NEMU-E
PLFY-P48NEMU-E
Model name
indication for
MAIN UNIT
INDOOR UNIT
[Service Ref.]
PLFY-P08NEMU-E
PLFY-P12NEMU-E
PLFY-P15NEMU-E
PLFY-P18NEMU-E
PLFY-P24NEMU-E
PLFY-P30NEMU-E
PLFY-P36NEMU-E
PLFY-P48NEMU-E
Model name
indication for GRILLE
REVISED EDITION-D
R410A
Revision:
• DISASSEMBLY PROCEDURE
has been modified in
REVISED EDITION-D.
• Some descriptions have been
modified.
OCH611 REVISED EDITION-C
is void.
CONTENTS
1. SAFETY PRECAUTION ......................... 2
3. SPECIFICATIONS ................................. 11
4. 4-WAY AIRFLOW SYSTEM .................. 16
6. WIRING DIAGRAM ............................... 20
9. TROUBLESHOOTING .......................... 29
PARTS CATALOG (OCB611)
March 2018
No. OCH611

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  • Page 1: Table Of Contents

    INDOOR UNIT FOR VRF SYSTEM March 2018 No. OCH611 REVISED EDITION-D TECHNICAL & SERVICE MANUAL R410A Indoor unit [Model Name] [Service Ref.] PLFY-P08NEMU-E Revision: PLFY-P08NEMU-E • DISASSEMBLY PROCEDURE has been modified in PLFY-P12NEMU-E PLFY-P12NEMU-E REVISED EDITION-D. • Some descriptions have been modified.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use the following tools specifically designed for Do not use the existing refrigerant piping. use with R410A refrigerant. The old refrigerant and lubricant in the existing piping The following tools are necessary to use R410A refrigerant.
  • Page 3 [1] Cautions for service (1) Perform service after recovering the refrigerant left in 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

    PARTS NAMES AND FUNCTIONS 2-1. Indoor Unit Drain pipe Filter Air outlet Liquid pipe Gas pipe Vane Air intake (Intake grille) 2-2. Wired Remote Controller <PAR-33MAA> <PAC-YT53CRAU> Wired remote controller function The functions which can be used are restricted according to each model. : Supported : Unsupported PAR-33MAA...
  • Page 5 2-2-1. Wired Remote Controller <Option> 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 The main display can be displayed in 2 different modes: "Full" and "Basic". The initial setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting. <Full mode> <Basic mode> All icons are displayed for explanation. 2345 Cool Set temp.
  • Page 7 Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the button. SELECT Vane · Louver · Vent. (Lossnay) High power Timer ON/OFF timer Auto-Off timer Weekly timer Restriction Temp. range Operation lock Energy saving Auto return...
  • Page 8 Main menu list Setting and display items Setting details 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. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.
  • Page 9 Setting and display items Setting details Input Select "Input maintenance Info." from the Service menu to bring up the Maintenance maintenance information screen. The following settings can be made from the Maintenance Information screen. • Model name input • Serial No. input • Dealer information input LOSSNAY This setting is required only when the operation of City Multi units is interlocked with setting...
  • Page 10 2-2-2. Wired Remote Controller <PAC-YT53CRAU> Note: The phrase "Wired remote controller" in this manual refers only to the PAC-YT53CRAU. 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 11: Specifications

    SPECIFICATIONS 3-1. SPECIFICATIONS Service Ref. PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E Power source 1-Phase 208–230 V, 60 HZ Cooling capacity BTU/h 8,000 12,000 15,000 18,000 (Nominal) Power input 0.02 0.02 0.02 0.02 Current input 0.25 0.26 0.29 0.29 Heating capacity BTU/h 9,000 13,500 17,000 20,000...
  • Page 12 Service Ref. PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E Power source 1-Phase 208–230 V, 60 HZ Cooling capacity BTU/h 24,000 30,000 36,000 48,000 (Nominal) 10.5 14.1 Power input 0.04 0.05 0.08 0.10 Current input 0.41 0.56 0.90 0.99 Heating capacity BTU/h 27,000 34,000 40,000 54,000 (Nominal)
  • Page 13 3-2. SOUND PRESSURE LEVEL PLFY-P•NEMU-E Sound pressure level in anechoic room: Low- Mid2-Mid1 -High Sound pressure level dB (A) 27-29-30-31 PLFY-P08NEMU-E PLFY-P12NEMU-E 27-29-30-31 PLFY-P15NEMU-E 28-29-30-31 PLFY-P18NEMU-E 28-30-31-32 PLFY-P24NEMU-E 28-31-34-37 PLFY-P30NEMU-E 28-32-35-38 PLFY-P36NEMU-E 35-38-41-44 PLFY-P48NEMU-E 36-39-42-45 Measurement location Note: Measured in anechoic room. OCH611D...
  • Page 14 3-3. NC CURVES PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E External Static Pressure: 0Pa [0.00in.WG] External Static Pressure: 0Pa [0.00in.WG] External Static Pressure: 0Pa [0.00in.WG] Power Source: 208-230V 60Hz Power Source: 208-230V 60Hz Power Source: 208-230V 60Hz 70.0 70.0 70.0 High 60Hz High 60Hz High 60Hz Middle 60Hz...
  • Page 15 3-4. ELECTRICAL PARTS SPECIFICATIONS Service Ref. PLFY-P36NEMU-E PLFY-P08NEMU-E Symbol PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P48NEMU-E PLFY-P12NEMU-E Parts name Room temperature Resistance 30_F/15.8 k", 50_F/9.6 k", 70_F/6.0 k", 80_F/4.8 k", 90_F/3.9 k", 100_F/3.2 k" TH21 thermistor Liquid pipe thermistor TH22 Resistance 30_F/15.8 k", 50_F/9.6 k", 70_F/6.0 k", 80_F/4.8 k", 90_F/3.9 k", 100_F/3.2 k" Resistance 30_F/15.8 k", 50_F/9.6 k", 70_F/6.0 k", 80_F/4.8 k", 90_F/3.9 k", 100_F/3.2 k"...

  • Page 16: Way Airflow System

    4-WAY AIRFLOW SYSTEM 4-1. 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 airflow and speed. Select the settings from Table1 according to the location in which you want to install the unit.
  • Page 17 4-2. 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 18 4-4. FRESH AIR INTAkE AMOUNT & STATIC PRESSURE CHARACTERISTICS PLFY-P08/12/15/18/24/30NEMU-E Taking air into the unit Multifunction casement + Standard filter 50(20) 50(20) 2 - inlet -50(-20) -50(-20) -100(-40) 1 - inlet -100(-40) -150(-60) -200(-80) -150(-60) [CMM] [CMM] [CFM] [CFM] Airflow rate Airflow rate Multifunction casement + High efficiency filter How to read curves...

  • Page 19: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E Unit: in (mm) OCH611D...

  • Page 20: Wiring Diagram

    WIRING DIAGRAM PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E LED2 LED1 * Be sure to turn off the source power and then disconnect fan motor connector. TH22 (Failure to do so will cause trouble in Fan motor) tº TH21 TH23 tº...

  • Page 21: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E Strainer (#100mesh) Pipe temperature detection thermistor/gas TH23 Heat exchanger Pipe temperature detection thermistor/liquid TH22 Distributor Capillary tube Strainer (#100mesh) Unit: in [mm] Model PLFY-P24/30/36/48NEMU-E PLFY-P08/12/15/18NEMU-E Item [1/2 [12.7] [ 5/8 [15.88] Gas pipe Liquid pipe [ 3/8 [9.52]...

  • Page 22: Microprocessor Control

    MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 8-1. COOL OPERATION <How to operate> button. 1 Press 2 Press [F1] button to display COOL. 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. <How to operate>...
  • Page 23 Control Mode Control Details Remarks 3. Drain pump 3-1. Drain pump control • The drain pump will always run when the unit is in COOL or DRY mode. (Regardless of the thermo ON/OFF) • Whenever the operation is changed over to the other modes (including Stop), the drain pump will stop pumping after approximately 3 minutes.
  • Page 24 8-2. DRY OPERATION <How to operate> button. 1 Press 2 Press [F1] button to display DRY. 3 Press [F2] [F3] button to set the set temperature. <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display DRY. 3 Press the TEMP. button to set the set temperature. NOTE: The set temperature changes 1°F when the button is pressed one time.
  • Page 25 8-3. FAN OPERATION <How to operate> button. 1 Press 2 Press [F1] button to display FAN. <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. adjustment Type Fan speed notch...
  • Page 26 8-4. HEAT OPERATION <How to operate> button. 1 Press 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. <How to operate> 1 Press POWER ON/OFF button.
  • Page 27 Control Mode Control Details Remarks "STAND BY" will be 2. Fan 2-1. Hot adjust mode displayed during the hot The fan controller becomes the hot adjust mode for the any of the following conditions. adjust mode. 1 When starting the HEAT operation 2 When the temperature adjustment function changes from OFF to ON.
  • Page 28 8-5. AUTO OPERATION [AUTOMATIC COOL/HEAT CHANGE OVER OPERATION] <How to operate> button. 1 Press 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. <How to operate>...

  • Page 29: Troubleshooting

    TROUBLESHOOTING 9-1. HOW TO CHECk THE PARTS PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E Parts name Check points Room temperature detection Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 50 to 86_F) thermistor (TH21) Normal Abnormal Pipe temperature detection...
  • Page 30 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 31 <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 Note: •...
  • Page 32 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 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 rotate.
  • Page 33 9-2. FUNCTION OF DIP SWITCH The black square (■) indicates a switch position. Operation by switch Effective Switch Pole Function Remarks timing Thermistor Built-in remote <Room temperature Indoor unit Indoor controller board controller detection> position Filter clogging Provided Not provided detection <Initial setting>...
  • Page 34 Operation by switch Effective Switch Pole Function Remarks timing SW11 SW12 SW11 Indoor controller board 1s digit Address setting address <Initial setting> should be done setting SW12 SW11 when M-NET SW12 remote controller is 10s digit being used. Before address setting power supply...
  • Page 35 The black square (■) indicates a switch position. Effective Switch Pole Operation by switch Remarks timing <Initial setting> Function ─ ─ ─ ─ ─ ─ 3 Pair No. of wireless remote controller Depends on the combination 1 2 3 4 of SW22-3 and 22-4 4 Pair No.
  • Page 36 9-3. TEST POINT DIAGRAM 9-3-1. Indoor controller board PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E Power supply for indoor controller board 3–5: 208–230 V AC CNMF Connect to the FUSE fan motor (MF) 6.3 A, 250 V 1–4: 310–340 V DC 5–4: 15 V DC 6–4: 0–6 V DC 7–4: 0 or 15 V DC (Stop)

  • Page 37: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLFY-P08NEMU-E PLFY-P12NEMU-E PLFY-P15NEMU-E PLFY-P18NEMU-E PLFY-P24NEMU-E PLFY-P30NEMU-E PLFY-P36NEMU-E PLFY-P48NEMU-E Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the intake grille and the filter Figure 1 Figure 2 Intake grille (1) Slide the levers in the direction indicated by the arrows Filter Intake grille 1 to open the intake grille.
  • Page 38 OPERATING PROCEDURE PHOTOS/FIGURES Photo 6 5. Removing the electrical box Bell mouth fixing screws (1) Remove the intake grille and the filter. (See Procedure 1.) (2) Remove the electrical box cover. (See Procedure 2.) (3) Disconnect the connectors. (Refer to procedure 4.) (4) Remove the 2 electrical box fixing screws (M5 ×...
  • Page 39 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the turbo fan motor Photo 10 (1) Remove the intake grille and the filter. (See Procedure 1.) • Nuts and washers (2) Remove the electrical box cover. (See Procedure 2.) • Rubber mounts (3) Disconnect the connectors. (Refer to procedure 4.) (4) Remove the electrical box.
  • Page 40 OPERATING PROCEDURE PHOTOS/FIGURES Photo 13 9. Removing the drain pan Drain pan (1) Remove the intake grille and the filter. (See Procedure 1.) (2) Remove the electrical box cover. (See Procedure 2.) (3) Disconnect the connectors. (Refer to Procedure 4.) (4) Remove the grille.
  • Page 41 OPERATING PROCEDURE PHOTOS/FIGURES Photo 17 12. Removing the heat exchanger (1) Remove the intake grille and the filter. (See Procedure 1.) ■ PLFY-P08/12/15/18/24/30NEMU-E (2) Remove the electrical box cover. (See Procedure 2.) Coil support (3) Disconnect the connectors. (Refer to Procedure 4.) fixing screw (4) Remove the grille.
  • Page 42 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN cCopyright 2016 MITSUBISHI ELECTRIC CORPORATION Issued: Mar.2018 No. OCH611 REVISED EDITION-D Issued: Aug.2017 No. OCH611 REVISED EDITION-C Issued: Jun. 2017 No. OCH611 REVISED EDITION-B Issued: Jun. 2016 No. OCH611 REVISED EDITION-A Published: Mar.

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