Mitsubishi Electric CITY MULTI PEFY-L06NMAU-A Technical & Service Manual
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Mitsubishi Electric CITY MULTI PEFY-L06NMAU-A Technical & Service Manual

Mitsubishi Electric CITY MULTI PEFY-L06NMAU-A Technical & Service Manual

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Summary of Contents for Mitsubishi Electric CITY MULTI PEFY-L06NMAU-A

  • Page 2: Safety Precautions

    Safety Precautions MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT Refrigerant This unit uses flammable refrigerant. WARNING Safety Group If refrigerant leaks and comes in contact with fire or heating part, it will (Risk of fire) create harmful gas and there is risk of fire. Read the OPERATION MANUAL carefully before operation.
  • Page 3 Doing so may cause the unit or pipes to burst, or result in explosion or fire during use, during repair, or at the time of disposal of the unit. It may also be in violation of applicable laws. MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the use of the wrong type of refrigerant.

  • Page 4: Cautions For Service

    MITSUBISHI ELECTRIC CORPORATION may result in smoke, fire, or explosion. (35) Consult your dealer for proper disposal method.
  • Page 5 (1-9) Checks on electrical devices Repair and maintenance to electrical components shall include initial safety checks and component inspection proce- dures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with.
  • Page 6 (7) Charging procedures In addition to conventional charging procedures, the following requirements shall be followed: Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the amount of REFRIGERANT contained in them. Cylinders shall be kept in an appropriate position according to the instructions.

  • Page 7: Service Tools

    Failure to install and maintain such temperature control mechanism may void the warranty for this unit. Mitsubishi Electric shall not bear any warranty obligation or other liability for any damage or loss in connection with such third party auxiliary heaters.

  • Page 8: Table Of Contents

    CONTENTS I Features [1] Features............................ 1 II Components and Functions [1] Components and Functions...................... 2 III Specifications [1] Specifications..........................5 1.Specifications.......................... 5 2.Electrical component specifications..................8 IV Outlines and Dimensions [1] Outlines and Dimensions......................10 V Wiring Diagram [1] Wiring Diagram ........................12 VI Refrigerant System Diagram [1] Refrigerant system diagram....................
  • Page 9 HWE24010...

  • Page 10: Features

    [ I Features ] I Features [1] Features Model Cooling capacity/Heating capacity BTU/h PEFY-L06NMAU-A 6000/6700 1.8/2.0 PEFY-L08NMAU-A 8000/9000 2.3/2.6 PEFY-L12NMAU-A 12000/13500 3.5/4.0 PEFY-L15NMAU-A 15000/17000 4.4/5.0 PEFY-L18NMAU-A 18000/20000 5.3/5.9 PEFY-L24NMAU-A 24000/27000 7.0/7.9 PEFY-L27NMAU-A 27000/30000 7.9/8.8 PEFY-L30NMAU-A 30000/34000 8.8/10.0 PEFY-L36NMAU-A 36000/40000 10.6/11.7 PEFY-L48NMAU-A 48000/54000 14.1/15.8...

  • Page 11: Components And Functions

    [ II Components and Functions ] II Components and Functions [1] Components and Functions 1. Indoor (Main) Unit (1) In case of rear inlet (2) In case of bottom inlet Air inlet Air inlet Air outlet Air outlet - 2 - HWE24010...
  • Page 12 [ II Components and Functions ] 2. Remote Controller [PAR-42MAAUB] Once the operation mode is selected, the unit will remain in the selected mode until changed. (1) Remote Controller Interface ⑤ ⑥ ④ ③ ② ① Function buttons ⑦ ⑧ ⑨...
  • Page 13 [ II Components and Functions ] (2) Remote Controller 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. ▌...

  • Page 14: Specifications

    [ III Specifications ] III Specifications [1] Specifications 1. Specifications Model PEFY-L06NMAU-A PEFY-L08NMAU-A PEFY-L12NMAU-A PEFY-L15NMAU-A Power source 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz Cooling capacity *1 BTU/h 6,000 8,000 12,000...
  • Page 15 [ III Specifications ] Model PEFY-L18NMAU-A PEFY-L24NMAU-A PEFY-L27NMAU-A PEFY-L30NMAU-A Power source 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz Cooling capacity *1 BTU/h 18,000 24,000 27,000 30,000 *1 kW *2 Power input 0.142 0.142...
  • Page 16 [ III Specifications ] Model PEFY-L36NMAU-A PEFY-L48NMAU-A PEFY-L54NMAU-A Power source 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz Cooling capacity *1 BTU/h 36,000 48,000 54,000 *1 kW 10.6 14.1 15.8 *2 Power input 0.222 0.242 0.252...

  • Page 17: Electrical Component Specifications

    [ III Specifications ] 2. Electrical component specifications Sym- Component PEFY-L06NMAU-A PEFY-L08NMAU-A PEFY-L12NMAU-A Room temperature TH21 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ thermistor Liquid pipe thermistor TH22 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ Gas pipe thermistor TH23 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ 250 VAC 6.3A Fuse 400 VDC 3A...
  • Page 18 [ III Specifications ] Sym- PEFY- PEFY- PEFY- Component L36NMAU-A L48NMAU-A L54NMAU-A Room temperature TH21 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ thermistor Liquid pipe thermistor TH22 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ Gas pipe thermistor TH23 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ 250 VAC 6.3A Fuse 400 VDC 3A...

  • Page 19: Outlines And Dimensions

    [ IV Outlines and Dimensions ] IV Outlines and Dimensions [1] Outlines and Dimensions 1. PEFY-L06, 08, 12, 15, 18, 24, 27, 30, 36, 48, 54NMAU-A Unit: mm (in.) - 10 - HWE24010...
  • Page 20 [ IV Outlines and Dimensions ] Unit: mm (in.) - 11 - HWE24010...

  • Page 21: Wiring Diagram

    [ V Wiring Diagram ] V Wiring Diagram [1] Wiring Diagram 1. PEFY-L06, 08, 12, 15, 18, 24, 27, 30, 36, 48, 54NMAU-A - 12 - HWE24010...

  • Page 22: Refrigerant System Diagram

    [ VI Refrigerant System Diagram ] VI Refrigerant System Diagram [1] Refrigerant system diagram Gas pipe thermistor TH23 Gas pipe Liquid pipe Brazed connections Strainer (#100 mesh) Linear expansion valve Liquid pipe thermistor TH22 Heat exchanger Room temperature thermistor TH21 Capacity PEFY-L06, 08, 12, 15, 18NMAU-A PEFY-L24, 27, 30, 36, 48, 54NMAU-A...

  • Page 23: Microprocessor Control

    [ VII Microprocessor Control ] VII Microprocessor Control [1] Microprocessor Control 1. Cool operation <How to operate> 1. Press POWER [ON/OFF] button. 2. Press the [F1] button to display Cool. 3. Press the [F2] or [F3] button to set the desired temperature. The set temperature changes 2°F when the [F2] or [F3] button is pressed one time.
  • Page 24 [ VII Microprocessor Control ] 2. Fan (1) By the remote controller setting (switch of 3 speeds+Auto) Type Fan speed notch 3 speeds + Auto type [Low], [Mid], [High], [Auto] When [Auto] is set, fan speed is changed depending on the value of: Room temperature - Desired temperature 3.

  • Page 25: Drying Operation

    [ VII Microprocessor Control ] 2. Drying operation <How to operate> 1. Press POWER [ON/OFF] button. 2. Press the [F1] button to display Drying. 3. Press the [F2] or [F3] button to set the desired temperature. The set temperature changes 2°F when the [F2] or [F3] button is pressed one time.

  • Page 26: Fan Operation

    [ VII Microprocessor Control ] 3. Fan operation <How to operate> 1. Press POWER [ON/OFF] button. 2. Press the [F4] button to display Fan. 1. Fan (1) Set by remote controller. Type Fan speed notch 3 speeds + Auto type [Low], [Mid], [High], [Auto] When [Auto] is set, fan speed becomes [Low].

  • Page 27: Heat Operation

    [ VII Microprocessor Control ] 4. Heat operation <How to operate> 1. Press POWER [ON/OFF] button. 2. Press the [F1] button to display Heat. 3. Press the [F2] or [F3] button to set the desired temperature. The set temperature changes 2°F when the [F2] or [F3] button is pressed one time.

  • Page 28: Auto Operation [Automatic Cool / Heat Change Over Operation]

    [ VII Microprocessor Control ] This control is same for the model without auxiliary heater. (4) Thermo OFF mode When the thermoregulating function changes to OFF, the indoor fan operates in [Extra low]. (5) Heat defrosting mode The indoor fan stops. 3.

  • Page 29: When Unit Is Stopped Control Mode

    [ VII Microprocessor Control ] 4. Heat mode (1) Same control as heat operation The value "3°F" is modifiable from 1.8°F to 9°F by maintenance tool. 6. When unit is stopped control mode 1. Drain pump (1) Drain pump control The drain pump turns ON for the specified amount of time when any of the following conditions is met: 1) ON for 3 minutes after the operation mode is switched from Cool or Drying to another operation mode (Fan).

  • Page 30: Heater Control

    [ VII Microprocessor Control ] 7. Heater control 1. Control specifications and DIP S/W setting Table 1 shows the function settings the field-installed heater. Select the desired pattern in the table below, and set the DIP SW on the outdoor and indoor units as shown in Table 1. Table.1 DIP S/W Heater control...
  • Page 31 [ VII Microprocessor Control ] Table 3 shows how the time delay is selected. Table.3 [Time Delay Selection Table] Function Setting *1 Action *3 108-1 Set Time Delay to 10 minutes 108-2 Set Time Delay to 15 minutes 108-3 Set Time Delay to 20 minutes *2 108-4 Set Time Delay to 25 minutes *1 Time delay can only be selected with MA controller.
  • Page 32 [ VII Microprocessor Control ] Chart 2 show how heater is on. The software has the function to turn on electric heater 5 minutes after turning on remote controller in case that outdoor unit cannot operate in heating mode because the system is in cooling priority mode. This function is available when function setting No.123 is set to “2”.
  • Page 33 [ VII Microprocessor Control ] (1) Turning on the heater with the fan setting set to OFF requires that the DIP S/W and connectors on the indoor units are set on site. Fan control All modes other than CN22 for in error *1 *5 in defrost SW3-2...
  • Page 34 [ VII Microprocessor Control ] 2. Time Delay canceled Information above is about when the Time Delay function is available. Function setting 107 set to 2 enables the Time Delay function, and set to 1 cancels the function. Detailed information when the Time Delay function is canceled is as follows. Table.5 Function setting 107 = 1 (Time Delay canceled) Heater control (Indoor...
  • Page 35 Use of this setting may conflict with certain local energy efficiency standards. Please check local requirements. Cancelation of the Time Delay function is intended for use in the Canadian market only and may not be reproduced or distributed without express written permission of Mitsubishi Electric. 3. PAC-YU25HT (Optional Parts) installation This section describes installation of the External Heater Adapter that connects to CITY MULTI air conditioner R454B series indoor unit.
  • Page 36 [ VII Microprocessor Control ] (2) Connection to the indoor unit Use the cables that fit the connectors on the indoor unit control board. 1) External output cable (with a yellow connector) This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.Select the heater output pattern (1st = CN24 or 2nd = CN24A) to use, and connect the cable to the connector on the indoor unit control board that corresponds to the selection.

  • Page 37: Troubleshooting

    [ VIII Troubleshooting ] VIII Troubleshooting [1] Troubleshooting 1. Check methods 1. Component and check points (1) Thermistor Room temperature thermistor (TH21) Liquid pipe thermistor (TH22) Gas pipe thermistor (TH23) Disconnect the connector and measure the resistance between terminals with a tester. (Ambient temperature 10°C - 30°C[50°F-86°F]) Normal Abnormal...
  • Page 38 [ VIII Troubleshooting ] 1) Summary of linear expansion valve (LEV) operation The LEV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board. The LEV position changes in response to the pulse signal. Indoor control board and LEV connection 12VDC Control board...
  • Page 39 [ VIII Troubleshooting ] 2) LEV operation Close <D> <C> Open Fully open valve (2000 pulses) No. of pulses Extra tightening (200 pulses) Valve opening degree <A> <E> <B> When the power is turned on, a pulse signal of fully open pulse + 10% pulse is output (valve closure signal), to bring the valve to position <A>.
  • Page 40 [ VIII Troubleshooting ] Symptom Checking Criteria Remedy Valve closure fail- To check the LEV on the indoor unit, check the indoor unit liquid pipe temperature Replace the LEV ure (leaky valve) that appears on the operation monitor on the outdoor unit's multi control board while if the amount of operating the indoor unit in question in the FAN mode and the other indoor units in leakage is great.
  • Page 41 [ VIII Troubleshooting ] (6) Refrigerant sensor Measure the resistance between the terminals with a multimeter. Normal Abnormal Below 10 Ω Open (10 Ω or more) After turning off the indoor unit breaker and leaving it for 5 minutes, measure the resistance value between the sensor termi- nals.

  • Page 42: Dc Fan Motor (Fan Motor/Indoor Control Board)

    [ VIII Troubleshooting ] 2. DC fan motor (fan motor/indoor control board) 1. CAUTION A high voltage is applied to the connector for connection to the fan motor (CNMF). Do not unplug the connector CNMF with the unit energized to avoid damage to the indoor control board and fan motor. 2.

  • Page 43: Address Switch Setting

    [ VIII Troubleshooting ] 3. Address switch setting Make sure that power to the unit is turned off. Indoor unit control board Indoor unit control board 1. When using an ME remote controller, set the address with the rotary switches (SW11, SW12). Address setting is not required when the unit remote controller is used.

  • Page 44: Voltage Test Points On The Control Board

    [ VIII Troubleshooting ] 4. Voltage test points on the control board 1. PEFY-L06, 08, 12, 15, 18, 24, 27, 30, 36, 48, 54NMAU-A Fuse (AC 250V 6.3A) Power supply voltage (208 - 230V) SW21 CN105 SW22 CN3M For M-NET transmission cable connection CN32 (24 - 30VDC (Between 1 and 3.))

  • Page 45: Dipswitch Setting (Factory Setting)

    [ VIII Troubleshooting ] 5. Dipswitch setting (Factory setting) 1. Function setting (1) SW1 Switch position Function Switch setting Active Thermistor (Intake air Built-in thermistor on the remote Indoor unit thermistor) controller Filter clogging detection Available Unavailable Filter life 2500 h 100 h Outdoor air intake Enabled...
  • Page 46 [ VIII Troubleshooting ] 2. Capacity code setting (1) SW2 Dipswitch settings must be made while the unit is stopped. Factory setting The switches are set to correspond to the unit capacity. PEFY-L06NMAU-A PEFY-L08NMAU-A PEFY-L12NMAU-A PEFY-L15NMAU-A PEFY-L18NMAU-A PEFY-L24NMAU-A PEFY-L27NMAU-A PEFY-L30NMAU-A PEFY-L36NMAU-A PEFY-L48NMAU-A PEFY-L54NMAU-A...
  • Page 47 [ VIII Troubleshooting ] To set the external static pressure with the switches on the control board External static pressure SW21-1 SW21-2 SW21-5 Initial setting 35 Pa 50 Pa ○ 70 Pa 100 Pa 150 Pa To set the external static pressure from the function selection screen on the remote controller (PAR-42MAAUB) Follow the instructions below and the instructions detailed in the remote controller manual for how to set the switches.

  • Page 48: Disassembly Procedure

    [ IX Disassembly Procedure ] IX Disassembly Procedure [1] Disassembly Procedure 1. Control box Exercise caution when removing heavy parts. 1. Removing the control box cover (1) Remove the three fixing screws on the cover (A) to re- move it. Tighten screws to a torque of 2.0 0.2 N·m.

  • Page 49: Thermistor (Intake Air)

    [ IX Disassembly Procedure ] 2. Thermistor (Intake air) Exercise caution when removing heavy parts. 1. Remove the control box cover according to the procedure in section 1. 2. Remove the thermistor. (1) Pull out the thermistor holder (B) and thermistor (C) on the control box.

  • Page 50: R454B Sensor

    [ IX Disassembly Procedure ] 4. R454B sensor Exercise caution when removing heavy parts. 1. Remove the control box cover according to the procedure in section 1. 2. Remove the R454B sensor. (1) Remove the R454B sensor connector (CNSA) in control box.

  • Page 51: Drain Pan

    [ IX Disassembly Procedure ] 5. Drain pan Exercise caution when removing heavy parts. 1. Removing the filter and the bottom plate (1) Push down the tab on the filter, and pull out the filter in the direction of the arrow 1. (2) Remove the fixing screws on the bottom plate (G), (H) to remove it.

  • Page 52: Lev

    [ IX Disassembly Procedure ] 6. LEV Exercise caution when removing heavy parts. 1. Removing the cover (1) Remove the five fixing screws on the cover (J) to remove Fig.8 2. Removing the LEV (1) Disconnect the LEV connector (CN60) from the control board.

  • Page 53: Thermistor (Gas Pipe) (Liquid Pipe)

    [ IX Disassembly Procedure ] 7. Thermistor (Gas pipe) (Liquid pipe) Exercise caution when removing heavy parts. 1. Remove the drain pan according to the procedure in sec- tion 5. 2. Removing the Heat exchanger cover (1) Remove the three fixing screws on the heat exchanger cover (K) to remove it.

  • Page 54: Fan And Fan Motor

    [ IX Disassembly Procedure ] 8. Fan and fan motor Exercise caution when removing heavy parts. 1. Removing the filter and the bottom plate (1) Push down the tab on the filter, and pull out the filter in the direction of the arrow 1. (2) Remove the fixing screws on the bottom plate (P) to re- move it.

  • Page 55: Heat Exchanger

    [ IX Disassembly Procedure ] (4) Remove the four fan case fixing screws to take the top half of the fan casing off. Tighten screws to a torque of 1.4 0.2 N·m. Fig.16 9. Heat exchanger Exercise caution when removing heavy parts. 1.

  • Page 56: Inspection And Maintenance

    [ X Inspection and maintenance ] X Inspection and maintenance [1] Inspection and maintenance 1. Guideline for preventive maintenance The following maintenance intervals indicate the estimated intervals of parts replacement and repair to be required as a result of periodic inspections. They do not necessarily mean that replacement is required at the maintenance intervals. The maintenance intervals do not indicate the warranty period.

  • Page 57: Recommended Parts Inspection Interval

    [ X Inspection and maintenance ] 2. Recommended parts inspection interval Inspection Maintenance Parts Inspection items Criteria Measures interval interval Visual check for dirt or Filter element is seen Clean the filter if it is torn. through. dirty. Long-life filter 5 years No torn or deformation.

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