Midea PTAC Series Service Manual
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Midea PTAC Series Service Manual

Midea PTAC Series Service Manual

7,000-15,000 btu/h
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SERVICE MANUAL
PTAC SERIES
7,000-15,000 BTU/H

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Summary of Contents for Midea PTAC Series

  • Page 1 SERVICE MANUAL PTAC SERIES 7,000-15,000 BTU/H...

  • Page 2: Table Of Contents

    CONTENTS P1-4 1. Precaution 1.1 Safety Precaution P1-4 1.2 Warning P5-7 2. Functions and control panel. 3. Dimension 4. Refrigerant Cycle Diagram P10-16 5. Electronic function 5.1 Terms and definitions 5.2 Electric Control working environment 5.3 Protection function P10-12 5.4 Operation of fan motor 5.5 Operation of compressor P13-14 5.6 Dip switches and Jumper selection...

  • Page 3: Precaution

    1. Precaution 1.1 Safety Precaution. ● To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first. 1.2 Warning INSTALLATION ●...
  • Page 4 ● Do not install the product on a defective installation stand. It may cause injury, accident, or damage to the product. ● Be sure the installation area does not deteriorate with age. If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.
  • Page 5 ● Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.) There is risk of physical injury, electric shock, or product failure. ● When the product is soaked (flooded or submerged), contact an Authorized service center. There is risk of fire or electric shock.
  • Page 6 OPERATIONAL ● Do not expose the skin directly to cool air for long periods of time. (Do not sit in the draft). This could harm to your health. ● Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner, not a precision refrigerant system There is risk of damage or loss of property.

  • Page 7: Functions And Control Panel

    2. Functions and control panel. The controls featured in this manual are representative of many available models. Your model may offer slightly different features. ·POWER - Press the POWER button to turn the unit on or off. When the unit is on,the power indicator light will be green.When the unit is off,the light will go out. ·MODE - Push this button to cycle through the modes from COOL-HEAT-FAN-COOL.The green indicator light beside the "MODE"...
  • Page 8 UP/DOWN BUTTONS ( ▲ / ▼ ) - Push the UP (or DOWN) button to increase (or decrease) the set temperature of the unit in cooling or heating mode.The temperature can be set by increments of 1℃ (1℉).The setting temperature appears in the display.
  • Page 9 Error codes: AS- Open or short circuit of room temperature sensor (T1); ES- Open or short circuit of evaporator temperature sensor( T2 ); CS-Open or short circuit of condenser temperature sensor (T3); oS-Open or short circuit of outside temperature sensor(T4); HS- Open or short circuit of exhaust temperature sensor( T5 or T6);...

  • Page 10: Dimension

    3. Dimension Top View Front View WxHxD（mm) Dimension : WxHxD（inch) Dimension 1 1067x406x532 （no sleeve,rear grille,and rear net) 42.0x15.9x20.9 Dimension 2 1067x408x578 （no rear grille and rear net, but include sleeve) 42.0x16.0x22.8 Dimension 3 1067x408x588 （include sleeve and rear net) 42.0x16.0x23.1 Dimension 4 1067x408x606...

  • Page 11: Refrigerant Cycle Diagram

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

  • Page 12: Electronic Function

    5. Electronic function 5.1 Terms and definitions T1: Temperature of indoor ambient T2: Temperature of evaporator T3: Temperature of condenser T4: Temperature of outdoor ambient TS: The set temperature. DAHT: Temperature of discharge (T5) DAHT: Temperature of discharge (T6) 5.2 Electric Control working environment Input voltage: 265V, 60Hz;...
  • Page 13 When T4＞T01 and lasts for 1 minute, the fan motor will operates at high speed. When T4＜T02 and lasts for 1 minute, the fan motor will operates at low speed. When T02≤T4≤T01: A) If fan motor is off originally, it will operate at high speed. B) If fan motor is on originally, it will keep on working at the original speed.

  • Page 14: Operation Of Compressor

    If T2＞TE7, this unit turns into the protection of compressor off , and quits this protection when T2≤TE9. If T2＞TE8,it turns into the protection of fan motor off , and quits this protection when T2≤TE9. If T2＞TE15, fan motor operates at low speed by force, then quits the operation and determines the high or low speed by T4.

  • Page 15: Dip Switches And Jumper Selection

    5.5.2.1 The Electric heater operates as below: a.When T1＜Ts-2℉, the fan motor operates, and 3 seconds later, the heater is on and operates at low speed within 30 seconds. After 30 seconds, it will change to the setting speed. If the DAHT temperature checked is higher than the protection temperature, when the heater operating, the fan motor will be off automatically.
  • Page 16 Table 1 DIP SWITCHES CONFIGURATIONS UP(ON) DOWN(OFF) Remarks Electric Heat Only Electric Heat and Pump Heat For Heat Pump unit only Temperature Display in ℉ Temperature Display in℃ Wall Thermostat Enable Control Panel Enable Two configurations (S4*S5) UP*UP:61℉~86℉(16℃~30℃); S4*S5 combine to select set point UP*DOWN:65℉~78℉(18℃~26℃);...

  • Page 17: Functions For Front Desk Switch Panel And Wire Controller

    5.7 Functions for Front desk switch panel and Wire Controller. 1.Front desk switch panel: if a ON/OFF switch is connected to the ports, you can turn off A/C unit with it. Then the digital LED on the unit will display FC. (The FIG.A shows you how to connect the units) 2.

  • Page 18: Unit Components

    SUGGESTIONS: 1. TO Size transformer, use the following equation: Quantity of PTAC units x 1va=Transformer Size (va) Example: 110 PTAC units x1va=110va Transformer 2. Following are American Wire Gauge recommended sizes: AWG WIRE SIZE NO. MAX. LENGTH (ft) 1500 2000 6.

  • Page 19: Installation Details

    wall Installation figure 7. Installation details 7.1 How to install the unit iINSTALLATION CAUTION There are sharp edges that can cause serious cuts. When lifting the air conditioner, it is HEAVY. Use 2 people to lift. www.mideaaircon.com...
  • Page 20 Dimension of air conditioner - For existing sleeve, you should 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 flange of the sleeve to secure the new air conditioner.

  • Page 21: Care And Cleaning

    - Lift unit level and slide unit into wall sleeve until firmly against front of wall sleeve and secure with 4 screws and washers (supplied in the SLEEVE ASSEMBLY) through the unit flange holes. (See Fig.7 and Fig.8) - Reinstall front panel.(See Fig.9) Place tabs over top rail A .
  • Page 22 VENT DOOR FILTER CAUTION MPORTANT:TURN UNIT OFF BEFORE CLEANING. UNIT DAMAGE HAZARD Failure to follow this caution may result in - If the vent door is open, access requires the removal of equipment damge or improper operation. the unit from the wall sleeve. Clean the vent filter twice a Airflow restriction may cause damage to the unit.

  • Page 23: Operation Characteristics

    8. Operation characteristics 8.1 Cooling operation Cooling Indoor air temp.℃ DB 8.2 Heating operation ℃ Outdoor air temp. DB www.mideaaircon.com...

  • Page 24: 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 hard wire kit). An accessory power cord must be ordered to connect the unit to the outlet.
  • Page 25 POWER CONNECTION CHART CODE OF POWER SUPPLY KIT UNI T 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 6-20P(20A / 240V ) MWDUP-12AEN1-MJ5 6-30P(30A / 240V ) MWDUP-12EEN1-MJ7 MWDUP-15AEN1-MI6...

  • Page 26: Troubleshooting

    10.Troubleshooting 10.1 Error Display Contents Codes 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(0℃/32℉) Temperature is higher than display range(37℃/99℉) Communication malfunction between main control board and display board.
  • Page 27 10.2 Troubleshooting 10.2.1 Open circuit or short circuit of temperature sensor diagnosis and solution(AS/E5/CS/oS/HS) Error Code AS/E5/CS/oS/HS Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, the conditions LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 28 10.2.2 Communication malfunction between main control board and display board. ( Error Code Malfunction decision Main control board does not receive feedback from display board conditions during 120 seconds. Supposed causes Wiring mistake ● display board Faulty ● main control board Faulty ●...
  • Page 29 10.2.3 Drive-by-wire controller failure Error Code Malfunction decision 1, Electric heating signal or compressor signal is on, but fan signal is conditions 2, Electric heating signal and compressor signal are on, but 4-way valve signal is off 3, Cooling only models have heating signal, or the 4-way valve signal and compressor signal are on at the same time.
  • Page 30 POSSIBLE CAUSES SOLUTONS Check that plug is plugged securely in wall receptacle. UNIT DOES NOT START Unit may have become unplugged Note:Plug has a test/reset button on it. Make sure that the plug has Fuse may have blown not tripped. Circuit breaker may have been tripped Replace the fuse.
  • Page 31 Characteristic of temperature sensor Resistance Resistance Resistance ℉ ℉ ℉ Temp.℃/ Temp.℃/ Temp.℃/ 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 32 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...

This manual is also suitable for:

Mp09hmb82Mp12hmb83Mwdup-07aen1-mk9Mwdup-07een1-mk9Mwdup-09aen1-mk3Mwdup-09een1-mk3 ... Show all

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