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mabe MMT12CDBSCCE8 Service Manual
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mabe MMT12CDBSCCE8 Service Manual

Wall mounted type on/off
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This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
Repair the product or products dealt with in this service information by anyone else could result in serious injury or death
SERVICE MANAUL
Model No.
WARNING
Wall Mounted Type
ON/OFF N-Series
MMT12CDBSCCE8
MMT12CDBWLCCE8
MMT12CABWCAM8
MMT12CDBWCAM8
MMT12CABWLCAM8
MMT12HABWLCAM8
MMT12CDBWLCAM8
MMT12HDBWLCAM8
MMT12HABSCAM8
MMT12HABWCAM8
MMT12HDBWCAM8
MMT18CDBWCAM8
MMT18HDBWCAM8
MMT24CDBWCAM8
MMT24HDBWCAM8

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Summary of Contents for mabe MMT12CDBSCCE8

  • Page 1 SERVICE MANAUL Wall Mounted Type ON/OFF N-Series Model No. MMT12CDBSCCE8 MMT12CDBWLCCE8 MMT12CABWCAM8 MMT12CDBWCAM8 MMT12CABWLCAM8 MMT12HABWLCAM8 MMT12CDBWLCAM8 MMT12HDBWLCAM8 MMT12HABSCAM8 MMT12HABWCAM8 MMT12HDBWCAM8 MMT18CDBWCAM8 MMT18HDBWCAM8 MMT24CDBWCAM8 MMT24HDBWCAM8 WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public.

  • Page 2: Table Of Contents

    Contents 1.Introduction..................... 1 2.Features ....................6 3.Sensors list ..................... 7 4.Pinping diagrams ..................8 5.Functions and control ................9 6.System configuration ................15 7.Service Diagnosis ................. 16 Domestic air conditioner...

  • Page 3: Introduction

    Introduction 1. Introduction 1.1 Safety Cautions Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead to serious accidents under some conditions if they are not followed.
  • Page 4 Introduction Warning Do not repair the electrical components with wet hands . Working on the equipment with wet hands can cause an electrical shock Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock.
  • Page 5 Introduction Warning Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to the electrical equipment, the internal wiring regulations and the instruction manual for installation when conducting electrical work. Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire. Be sure to use the specified cable to connect between the indoor and outdoor units.
  • Page 6 Introduction Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks. If a combustible gas leaks and remains around the unit, it can cause a fire.
  • Page 7 Introduction Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections can cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it.

  • Page 8: Features

    Features 2.Features 4 Fan setting :Select the fan speed LO,MED,HI,AUTO Anti-mold filter: Catches most small particles and remove unpleasant odors effectively. Sleep mode: The setting temperature and the indoor noise can be adjusted to a more comfortable level when you set the “sleep mode” during night sleep. 24Hour timer: Use the timer function to set on,or off,or from on to off,or from off to on Auto restart: Automatic return to previous operation conditions after sudden power blackout Easy clean design: The panel is easy to wash and the airflow vents can be detached easily...

  • Page 9: Sensors List

    Sensors list 3.Sensors list 3.1 Indoor unit type Description s ’ t Pipe sensor It’s used for detecting temperature of evaporator 3.2 Outdoor unit type Description i t c Its used for detecting suction pipe temperature of compressor Suction sensor to adjust gas flowing Domestic air conditioner...

  • Page 10: Pinping Diagrams

    Piping diagrams 4 Pinping diagrams Domestic air conditioner...

  • Page 11: Functions And Control

    Functions and control 5.Functions and control 5.1 Main functions and control specifications Including brief introduction to air conditioners of series models and electric control function. 5.1.1 Automatic running (1) Single cold automatic run mode: First entering into this mode, the main control “MCU” determines the corresponding work pattern according to the indoor temperature between cooling mode and blowing mode.
  • Page 12 Functions and control temperature control precision: 1 compressor can’t be controlled by temperature sensor within 2 minutes after it starts. control character: when Tr Ts, outlet air from compressor is on and indoor fan motor run at fixed wind speed. When Tr Ts, outlet air from compressor is off , and when Tr >...
  • Page 13 Functions and control State1 State2 State3 Ts-1 Ts+2 Ts+2 When all the ranges alternate, there is ±1 difference. 5.1.5 Heating mode: (cooling only have no the mode) *Temperature control range : 16 —30 *Temperature control precision: 1 *Control Character: When Tr Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan motor runs as in cold blast mode, and 4 of compensation is added after compressor is started.
  • Page 14 Functions and control 23 , fan motor enter breeze mode; and if the temperature of coil pipe is below 20 , fan motor stops running. 5.1.5.2 High temperature protection and high temperature expiration protection: 5.1.5.2.1 High temperature prevention: When the temp. of coil pipe is above 56 , the outdoor fan motor stops.
  • Page 15 Functions and control 5.1.6 Timer function: You can set 24-hour timer on or timer off as required, and the minimum time unit is 1 minute. After setting, the indicator of indoor unit is on , and it is off when timer setting is completed. There are several timer mode as follows. 5.1.6.1 Timer on: The LED of “timer on”...
  • Page 16 Functions and control 5.1.8.2 If the switch is kept pressed for 5 seconds, buzzer ring two times and unit enter enter test run mode. 5.1.8.3 Press the switch again, and then closes. 5.1.8.4 Enter emergency operation from timer mode, then timer is cancelled. 5.1.9 Test run: 5.1.9.1 The temperature sensor of inlet air doesn’t work, and compressor starts (but subject to the limit of -minute delay excluding the first time), and high wind, cooling, and air door is open.

  • Page 17: System Configuration

    System configuration 6.System configuration After the installation and test operation of the room air conditioner have been completed, it should be operated and handled as described below. Every user would like to know the correct method of operation of the room air conditioner, to check if it is capable of cooling(or heating) well, and to know a clever method of using it.

  • Page 18: Service Diagnosis

    Service Diagnosis 7.Service Diagnosis 7.1 Caution for Diagnosis The operation lamp flashes when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2.
  • Page 19 Service Diagnosis 7.3.1 Thermistor or Related Abnormality Indoor Display E1: Room temperature sensor failure E2: Heat-exchange sensor failure Method of The temperatures detected by the thermistors are used to determine thermistor errors Malfunction Detection Malfunction when the thermistor input is more than 4.92V or less than 0.08V during compressor Conditions Note: The values vary slightly in some models Supposed...
  • Page 20 Service Diagnosis 7.3.2 EEPROM abnormal Indoor Display E4: indoor EEPROM error Method of The Data detected by the EEPROM are used to determine MCU Malfunction Detection Malfunction when the data of EEPROM is error or the EEPROM is damaged Decision Conditions Supposed Faulty EEPROM data...
  • Page 21 Service Diagnosis 7.4.3 Indoor AC fan motor malfunction Indoor Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation Detection Malfunction when the detected rotation feedback signal don’t received in 2 minutes Decision Conditions Supposed...
  • Page 22 REMOVAL PROCEDURE Wall Mounted Type 35 -Series ON/OFF Model No. MMT12CDBSCCEE8 MMT12CDBWLCCEE8 MMT12HDBWCAME8 MMT18CDBWCAME8 MMT18HDBWCAME8 WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.
  • Page 23 1. Removal of outdoor panel...
  • Page 24 1. Removal of Electrical Box...
  • Page 27 2. Removal of Electrical Box...
  • Page 29 9.12 Removal of fan motor bracket and partition...
  • Page 31 9.13 Removal of compressor and heat exchanger...
  • Page 33 REMOVAL PROCEDURE Wall Mounted Type N-Series Model No. MMI18CDBWCCEI8 MMT18CDBWCAMI8 MMT18HDBWCAMI8 WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.
  • Page 34 Removal Procedure Removal of front panel Remove the foam cushion Domestic Air Conditioner...
  • Page 35 Removal Procedure Hold the front panel by the tabs on the both sides and lift it until it stops with a click. Loosen the screw and lift up the casing cover Loosen the screw and lift up the control box cover Pull the wires out of the control box and then...
  • Page 36 Removal Procedure Remove the air filters and horizontal flap Lift an air filter upwards slightly and then pull it out downwards Remove th e horizontal flap The horizontal flap is Double Release the side of pivot and then Release the Center of the pivot.
  • Page 37 Removal Procedure Remove the casing Release the screw covers(3EA) Loosen the marked Screw (7EA) Domestic Air Conditioner...
  • Page 38 Removal Procedure Hole (4EA) When assembling, install the front Release the marked grille horizontally hooks (4EA) and then so as not to stuff Pull the front grille out the flap inside. When assembling, Horizontally and remove it make sure the four hooks are caught properly.
  • Page 39 Removal Procedure Release stepping motor and control box Loosen the stepping motor screws (4EA) and then Release the stepping motor Loosen the control Box screws (2EA) And then pull it. Domestic Air Conditioner...
  • Page 40 Removal Procedure Removal of Heat Exchanger Loosen the marked screws(2EA) Pull mounting plate and heat exchanger bracket and then release them. Release fixture plate from the base frame hook and remove it. Domestic Air Conditioner...
  • Page 41 Removal Procedure Loosen the marked screws (7EA) Remove the heat exchanger Remove Fan rotor Loosen the marked screws(4EA) and release the cover of fan motor Domestic Air Conditioner...
  • Page 42 Removal Procedure Loosen the marked screw (1EA) and remove fan motor Screw of fan rotor Lift up the right part of the fan and remove it Domestic Air Conditioner...
  • Page 43 Removal Procedure Remove horizontal louver and fan motor bracket Every blade go round and round, then move Remove fan motor bracket Pull the hook of fan motor bracket and upward remove it Domestic Air Conditioner...
  • Page 44 Removal Procedure Pull the hook of bearing bracket and upward remove it Domestic Air Conditioner...

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