Midea MP12HMB63 Service Manual
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Midea MP12HMB63 Service Manual

Ptac series 7,000-15,000 btu/h
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SERVICE MANUAL

PTACSERIES
7,000-15,000 BTU/H

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Summary of Contents for Midea MP12HMB63

  • Page 1: Service Manual

    SERVICE MANUAL PTACSERIES 7,000-15,000 BTU/H...

  • Page 2: Table Of Contents

    CONTENTS Precaution Safety Precaution Warning Dimensions Unit Components 5-15 Installation Details How to Install Unit Care and Cleaning 9-15 Other Installations 16-20 Functions and Control Panel Refrigerant Cycle Diagram 21-25 Electronic Function Terms and Definitions Electric Control Working Environment Protection Function 22-23 Operation of Fan Motor 24-25...

  • Page 3: Precaution

    1. Precaution 1.1 Safety Precaution To prevent personal injury and/or property damage, follow the instructions below. Failure to follow correct procedure may result in personal injury, death, and/or property damage. Before servicing unit, read this service manual. 1.2 Warning INSTALLATION To reduce the risk of fire or explosion, electric shock, personal injury, death, product failure, or property damage during the installation process, read and follow the warnings listed below.
  • Page 4 supply. ● Stop operation and close window during a storm. If possible, remove product from window. ● Do not open the product’s inlet grill while in operation. If the unit has an electrostatic filter, do not touch it. ● Avoid having water enter the unit. ●...

  • Page 5: Dimensions

    ● Do not drink the water drained from the product. It is unsanitary. ● Use a firm stool or ladder when cleaning the product. ● Replace all batteries in the remote control with new ones. Do not mix old and new batteries. ●...

  • Page 6: Unit Components

    3. Unit Components Decomposition Figure www.mideaaircon.com 4...

  • Page 7: Installation Details

    4. Installation Details 4.1 How to Install Unit www.mideaaircon.com 5...
  • Page 8 Dimensions of air conditioner PREPARATION OF SLEEVE ASSEMBLY (optional) • For an existing sleeve, measure the wall sleeve dimensions. • Install the new air conditioner according to these installation instructions to achieve the best performance. All wall sleeves used to mount the new air conditioner must be in good structural condition and have a rear grille that securely attaches to the sleeve or the overhang...

  • Page 9: Care And Cleaning

    4.2 Care and Cleaning UNIT INSTALLATION (CONTINUED) • FRONT PANEL AND CASE Keep unit levelled when lifting and sliding it into wall sleeve. Once it is firmly against front Turn unit off and disconnect from power supply. of wall sleeve, secure with 4 screws and To clean, use water and a mild detergent.
  • Page 10 VENT DOOR FILTER CAUTION IMPORTANT: Turn unit off before cleaning UNIT DAMAGE HAZARD • If the vent door is open, gaining access Failure to follow t h i s caution may result in equipment requires removing the unit from the wall damage or improper operation.

  • Page 11: Other Installations

    4.3 Other Installations Optional Wired/Wireless Digital Wall Stat and EMS systems. DIP SWITCH 24V WIRED CONTROL Digital Wired/Wireless Wall Stat Terminal www.mideaaircon.com 9...
  • Page 12 Thermostat Installation To install wired thermostat, plug it in directly to the unit as shown below: Controller for Wired Stat Hook up wall stat connector with the digital stat controller circled in red. 24V Controller for PRO1 wireless or other wired modules.
  • Page 13 Hook up wall stat connector to the unit as shown in the image. It is advisable to affix wall stat wire with tape to avoid any damage while installing the unit. www.mideaaircon.com 11...
  • Page 14 PRO1 Wireless and Wired Digital Wall Stat Configuration Follow the steps below: 1. Power OFF the unit. 2. Turn OFF all the DIP switches by pushing them down. 3. Turn ON S3—the second switch on the second block from right—by pushing it up. Circled in red below.
  • Page 15 5. Connect the wireless or wired module with controller. Use the table below as guidance. www.mideaaircon.com 13...
  • Page 16 6. Jump the connection between Heat 1 and Heat 2 as shown below. 7. After connecting the stat with unit, apply double-sided tape on the back of wireless module. www.mideaaircon.com 14...
  • Page 17 8. Stick the module to unit as depicted below. 9. Set the thermostat to OFF. 10. Set CO to b on thermostat by following the procedure below: Press and hold + and - on thermostat until it displays CA 1. Then press them again to get either CO b or CO 0.

  • Page 18: Functions And Control Panel

    5. Functions and Control Panel The controls featured in this manual are found in many different models. There may be slight variations. POWER Press the POWER button to turn the unit on or off. When the unit is on, the power indicator light will be green.
  • Page 19 Push this button to change the fan speed to HIGH, MED, or LOW. DISPLAY Shows the set temperature in °C or °F. While on FAN-only mode, it shows the ambient temperature. Control codes: • LC: Pads on the control panel are not available. The unit can be set by using wire controller only. Note: When receiving the wired remote control signal display LC.
  • Page 20 Other codes: • LO: Room temperature is lower than 32°F. • HI: Room temperature is higher than 99°F. • E4: Communication failure between main control board and display board. • LE: Wire Controller mode failure DIP Switches Configurations and functions of each DIP switch position are explained below. www.mideaaircon.com 18...
  • Page 21 DIP Switches Configurations UP (ON) DOWN (OFF) Remarks Electric heat only Electric heat and pump heat For heat pump unit only. Temperature Display in °C Temperature Display in °F Wall thermostat enable Control panel enable UP*UP: 61°F – 86°F Two configurations UP*DOWN: 65°F –...
  • Page 22 FRONT DESK SWITCH PANEL ROOM 100 ROOM 101 ROOM N FIELD-SUPPLIED TRANSFORMER (SEE NOTE 1) Black Black Black White White White PTAC #1 PTAC #2 PTAC #N SUGGESTIONS: To size a transformer, use the following equation: Quantity of PTAC units x 1 VA = Transformer Size (VA) Example: 110 PTAC units x 1 VA = 110 VA Transformer Below are the American Wire Gauge (AWG) recommended sizes: AWG WIRE SIZE NO.

  • Page 23: Refrigerant Cycle Diagram

    6. Refrigerant Cycle Diagram The figure below is a brief description of the important components and their function in the refrigeration system. This will help to explain the refrigeration cycle and the flow of the refrigerant in the Heat Pump Cycle. CHECK VALVE LIQUID SIDE (Heating Model only)

  • Page 24: Electric Control Working Environment

    7.2 Electric Control Working Environment Input voltage: 265V, 60Hz; 230/208V, 60Hz 7.3 Protection Function • The compressor protection functions with a delay of 3 minutes. • Sensor protection at open or short circuit of sensor. • Evaporator anti-freezing protection in cooling mode. 7.4 Operation of Fan Motor 7.4.1 Fan motor is on when compressor is on.
  • Page 25 7.4.3 The fan motor operating in heat pump and cooling mode (see Fig. B). T4 Operate on low speed Operate on high speed Fig. B • If T4≥T03 and lasts for 1 minute, the fan motor will operate at low speed. •...

  • Page 26: Operation Of Compressor

    7.5 Operation of Compressor 7.5.1 The compressor operating in cooling mode. Operation condition (T1-Ts) °F Compressor on Compressor off T1≥Ts compressor is on T1≤Ts-4°F compressor is off 7.5.2 The compressor operating at heating mode. There are two heating modes: (1) heat pump and (2) electric heater. The electrical heater or compressor will activate by sensing difference between set point and ambient temperature.

  • Page 27: Dip Switches And Jumper Selection

    7.5.2.2 The heat pump operation. The heat pump’s operation mode correlates to whether the compressor is operating. When the compressor is on and the electric heater is off, the fan motor will operate according to the anti-cold wind of heat pump. The four-way valve is always on. If T1<Ts-2°F, the compressor is on. If T1≥Ts+2°F, the compressor will be off.

  • Page 28: Power Connection Options

    9. Power Connection Options Appropriate power cord accessory kit is determined by the voltage and amperage of the branch circuit. The unit does not come with a power cord (or hardwire kit). An accessory power cord must be ordered to connect the unit to an outlet. If the unit is to be hardwired, an accessory hardwire kit must be ordered.
  • Page 29 Power Connection Chart CODE OF POWER SUPPLY KIT UNIT MODEL 208 / 230 V 208 / 230 V 208 / 230 V MWDUP-07AEN1-MK9 6-15P(15A / 240V ) 6-20P(20A / 240V ) MWDUP-07EEN1-MK9 MWDUP-09AEN1-MK3 MWDUP-09EEN1-MK3 MWDUP-12AEN1-MJ5 6-20P(20A / 240V ) MWDUP-12EEN1-MJ7 6-30P(30A / 240V ) MWDUP-15AEN1-MI6 MWDUP-15EEN1-MI5...

  • Page 30: Troubleshooting

    10. Troubleshooting 10.1 Error Display Codes Explanations Open or short circuit of T1 temperature sensor Open or short circuit of T2 temperature sensor Open or short circuit of T3 temperature sensor Open or short circuit of T4 temperature sensor Open or short circuit of T5 or T6 temperature sensor Temperature is lower than display range (32°F) Temperature is higher than display range (99°F) Communication malfunction between main control board and display board...
  • Page 31 T5/T T4 T3 www.mideaaircon.com 29...

  • Page 32: Troubleshooting

    10.2.2 Communication malfunction between main control board and display board (E4). Error Code: Main control board does not receive feedback from display Malfunctioning conditions: board during 120 seconds. Wiring error ● Possible causes: Faulty display board ● Faulty main control board ●...
  • Page 33 10.2.3 Drive-by-wire controller failure (LE). Error Code: Electric heating signal or compressor signal is on, but fan signal is off. Electric heating and compressor signals are on, but 4-way Malfunctioning conditions: valve signal is off. Cooling only models have heating signal, or the 4-way valve and compressor signals are on at the same time.
  • Page 34 Possible Causes Solutions UNIT DOES NOT START Check that plug is securely connected to outlet. Unit is unplugged. Note: Plug has a test/reset button on it. Make sure that the plug Blown fuse. has not tripped. Tripped circuit breaker. Replace fuse. See Note 1 below. Unit is turned off.
  • Page 35 Characteristics of Temperature Sensor Resistance Resistance Resistance Temp. °C/°F Temp. °C/°F Temp. °C/°F KΩ KΩ KΩ -10/14 62.2756 14.6181 4.3874 17/62 44/111 -9 /15.8 58.7079 13.918 4.2126 18/64 45/113 -8 /17.6 56.3694 13.2631 4.0459 19/66 46/115 -7 /19.4 52.2438 12.6431 3.8867 20/68 47/117...
  • Page 36 GD Midea Air-Conditioning Equipment Co.,Ltd RAC Overseas Sales Company Midea headquarter building,No.6 Midea Avenue Beijiao, ShunDe, Foshan, GuangDong, P.R.C, 528311 Website: www.mideaaircon.com...

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