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Everwell MGTC1823EA-20 Service Manual

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Inverter air conditioner
Service Manual
MGTC0913E-20/MGTC0913C-20
MGTC0923E-20/MGTC0923C-20
MGTC1213E-20/MGTC1213C-20
MGTC1223E-20/MGTC1223C-20
MGTC1823EA-20/MGTC1823CA-20
MGTC2423EA-20/MGTC2423CA-20
MGTC3623EA-17/MGTC3623CA-17
Air Conditioner Service Manual
Models
1

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Summary of Contents for Everwell MGTC1823EA-20

  • Page 1 Air Conditioner Service Manual Inverter air conditioner Service Manual Models MGTC0913E-20/MGTC0913C-20 MGTC0923E-20/MGTC0923C-20 MGTC1213E-20/MGTC1213C-20 MGTC1223E-20/MGTC1223C-20 MGTC1823EA-20/MGTC1823CA-20 MGTC2423EA-20/MGTC2423CA-20 MGTC3623EA-17/MGTC3623CA-17...

  • Page 2: Table Of Contents

    Air Conditioner Service Manual CONTENTS Part Ⅰ Technical Information ......................3 1. Important Notice ........................3 2. Refrigeration cycle diagram ...................... 4 3. Electric Diagram........................5 3.1 Wiring diagram ........................ 5 3.2 Remote Controller......................12 4. Electronic Controller Introduction ................... 13 4.1 Electronic Controller ......................

  • Page 3: Part Ⅰ Technical Information

    Air Conditioner Service Manual Part Ⅰ Technical Information 1. Important Notice This service manual is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. Any attempt to repair the appliance may result in personal injury and property damage.

  • Page 4: Refrigeration Cycle Diagram

    Air Conditioner Service Manual 2. Refrigeration cycle diagram Cool only Liquid side 2-way valve Capillary Heat exchange Heat exchange (Evaporator) (condenser) Gas side 3-way valve Accumulator Compressor Liquid side 2-way valve Electronic expansion valve Heat exchange Heat exchange (Condenser) (Evaporator) Gas side 3-way valve 4-way valve...

  • Page 5: Electric Diagram

    Air Conditioner Service Manual 3. Electric Diagram 3.1 Wiring diagram INDOOR MODEL: MGTC0913E-20 OUTDOOR MODEL: MGTC0913C-20...
  • Page 6 Air Conditioner Service Manual INDOOR MODEL: MGTC0923E-20 OUTDOOR MODEL: MGTC0923C-20...
  • Page 7 Air Conditioner Service Manual INDOOR MODEL: MGTC1213E-20 OUTDOOR MODEL: MGTC1213C-20...
  • Page 8 Air Conditioner Service Manual INDOOR MODEL: MGTC1223E-20 OUTDOOR MODEL: MGTC1223C-20...
  • Page 9 Air Conditioner Service Manual INDOOR MODEL: MGTC1823EA-20 OUTDOOR MODEL: MGTC1823CA-20...
  • Page 10 Air Conditioner Service Manual INDOOR MODEL: MGTC2423EA-20 OUTDOOR MODEL: MGTC2423CA-20...
  • Page 11 Air Conditioner Service Manual INDOOR MODEL: MGTC3623EA-17 OUTDOOR MODEL: MGTC3623CA-17...

  • Page 12: Remote Controller

    Air Conditioner Service Manual 3.2 Remote Controller...

  • Page 13: Electronic Controller Introduction

    Air Conditioner Service Manual 4. Electronic Controller Introduction 4.1 Electronic Controller RT-------Room Temperature. IPT------Indoor Pipe (Coil) Temperature. ST------Indoor Setting Temperature. OPT---Outdoor Pipe Temperature. OAT---Outdoor Ambient Temperature. ODT---Outdoor Discharge Temperature. CRT---Compensated Room Temperature. IDU--- Indoor unit ODU---Outdoor unit. Note: When AC finishing installation, because of the air ventilation and the distance of temperature test sensor to different location of the house, the temperature for IDU PCB control need compensation.
  • Page 14 Air Conditioner Service Manual Anti-frosting protection Control the unit operation frequency and the frequency changing rate to achieve anti-frosting protection. 1). Frequency Slowly Increasing(FSI): ℃ a. If 6℃≤IPT＜7 , the frequency increasing rate is 1Hz/60s, slowly increasing operation speed. ℃ b.
  • Page 15 Air Conditioner Service Manual 6). In the process of unit operation, once the compressor ceased, it should be 3 min delay for the next procedure. 3. IDU time delay: When compressor stops or unit switches off while in heating mode, IDU fan motor will work for a few seconds more to prevent overheat.
  • Page 16 Air Conditioner Service Manual COMPRESSOR 4-way VALVE OUTDOOR FAN Defrosting max time Defrosting end off: Compressor stops working, and re-starts to working after 50s delay; 7. Cold air prevention: This function intends to prevent cold air from being discharged when the heating operation starts up 1).
  • Page 17 Air Conditioner Service Manual TIMER OFF 1). TIMER OFF can be set only when the air conditioner is ON. 2). Press TIMER on the remote control ONCE to enter time setting. 3). Press “▲” or “▼” to set the time for unit to stop working. 4).
  • Page 18 Air Conditioner Service Manual Note: If the defective failure can’t be recovered, the failure can’t eliminate even if operation mode changed. 4.1.10.2 The compressor discharge temperature protection 1. If ODT≥115℃, unit stops working for over temperature protection; While ODT＜100℃, & after compressor stopped for 3 min, the unit can be started to operate. 2.

  • Page 19: Wifi Operation Maual

    Air Conditioner Service Manual Once the IDU & ODU communication recovery, and also the compressor stopped for 3 min already, can the unit be recovered to operate. 4.2 WIFI OPERATION MAUAL 4.2.1 The WIFI control logic CLOUD Internet controller Home wireless router TCL AC...

  • Page 20: Part Ⅱ Installation And Maintenance

    Air Conditioner Service Manual PART Ⅱ Installation and Maintenance 1. Notes for installation and maintenance Safety Precautions Important! Please read the safety of precautions carefully before installation and maintenance. The following contents are very important for installation and maintenance. Please follow the instructions bellow. ●...
  • Page 21 Air Conditioner Service Manual Improper installation may lead to fire hazard, explosion, electric shock or injury. Safety precautions for Installing and Relocating the unit. To ensure safety, please be mindful of the following precautions. Warnings When installing or relocating the unit, be sure to keep the refrigerant circuit free from air or substances other than the specified refrigerant.
  • Page 22 Air Conditioner Service Manual Where: is the allowable maximum charge in a room, in kg; M is the refrigerant charge amount in appliance, in kg; is the required minimum room area, in m2; A is the room area, in m2; LFL is the lower flammable limit, in kg/m3;...
  • Page 23 Air Conditioner Service Manual Open Flames Prohibited Ventilation Necessary Operation Safety Open Flames Prohibited Mind Static Electricity Must wear protective clothing and anti-static gloves Don`t use mobile phone Installation Safety  Refrigerant Leak Detector  Appropriate Installation The left picture is the schematic diagram of a refrigerant leak Location detector.
  • Page 24 Air Conditioner Service Manual A) The maintenance site should be equipped with a fixed-type combustible refrigerant concentration detector and connected to a safeguard alarm system; its error must be not more than 5%. B) The installation site should be equipped with a portable combustible refrigerant concentration detector which can realize two-level audible and visual alarm;...
  • Page 25 Air Conditioner Service Manual the corresponding air conditioner manufacturer to check the air conditioner leak or not. Warning If leak may exist, it is necessary to move all the fire out from the site or extinguish fire and then immediately shut off the air conditioner. Meanwhile, it is necessary to make sure well-ventilated. 4).
  • Page 26 Air Conditioner Service Manual  When filling the refrigerant, it is necessary to fill corresponding type and volume of refrigerant as per the requirements on the product nameplate and overfilling is prohibited.  It is necessary to seal the system in a safe sealing way after maintaining the refrigerating system. ...

  • Page 27: Installation

    Air Conditioner Service Manual 2 Installation 2.1 Installation Dimension Diagram Space to the wall At least 15cm At least 15cm Space to the wall Space to the obstruction Space to the floor Space to the obstruction Drainage pipe Connecting wire...

  • Page 28: Accessory

    Air Conditioner Service Manual 2.2 Accessory Remote controller Remote Batteries Vinyl tape controller supporter Drain hose Hole cover Screw Insulation material 2.3 Tools Picture Picture Picture Tool name Tool name Tool name Standard Pipe Vacuum Pump Wrench Cutter Screw Adjustable/ drivers Crescent (Phillips &...

  • Page 29: Position

    Air Conditioner Service Manual 1） Must follow the electric safety regulations when 2.4 Position installing the unit. Indoor unit 2） According to the local safety regulations, use  Install the indoor unit level on a strong wall that is qualified power supply circuit and air switch. not subject to vibrations 3）...
  • Page 30 Air Conditioner Service Manual 9K(770X) The hole must slope downwards towards the exterior. Note: Keep the drain pipe down towards the direction of the wall hole, otherwise leakage may occur. 1.6.3 Electrical connections---Indoor unit 1).Lift the front panel. 2).Take off the cover as indicated in the picture (by 12K(770X) removing a screw or by breaking the hooks).
  • Page 31 Air Conditioner Service Manual Wrap the insulation material around the connecting portion.  Overlap the connection pipe insulation material and the indoor unit pipe insulation material. Bind them together with vinyl tape so that there is no gap. Shape the connection pipe 1.6.4 Connecting the pipes.

  • Page 32: Odu Installation

    Air Conditioner Service Manual 1) Fasten the drain port in the 25mm hole placed in the part of the unit as shown in the picture. 2) Connect the drain port and the drain pipe. Pay attention that water is drained in a suitable place. ...

  • Page 33: Vacuum And Gas Leakage Test

    Air Conditioner Service Manual 2.8 Vacuum and gas leakage test 2.9 Final test 1. Use vacuum Pump 1 Preparation of test operation.  The client approves the air conditioner 1) Air and humidity left inside the refrigerant circuit can cause compressor malfunction. After having connected installation.

  • Page 34: Maintenance

    Air Conditioner Service Manual 3. Maintenance 3.1 Failure code Code Reason Remark IDU & ODU Communication failure The IDU & ODU wiring connection correct? IDU Room Temperature sensor failure.（IDU IDU sensor and PCB. RT failure） IDU Coil temperature sensor failure.（IDU IPT IDU sensor and PCB.
  • Page 35 Air Conditioner Service Manual Cooling system gas flow abnormal Please check the troubleshooting for detail. PROTECTION. PFC PROTECTION Please check the troubleshooting for detail. The Compressor lack of phase / Anti-phase Please check the troubleshooting for detail. PROTECTION. IPM Module temperature PROTECTION Please check the troubleshooting for detail.

  • Page 36: Trouble Shooting

    Air Conditioner Service Manual 3.2 Trouble shooting 3.2.1 E0 ---IDU & ODU communication failure Start Display E0 IDU wiring Check and re- E0 disappear? connection correct? connect Check communication Replace/ re- E0 disappear? wiring and the connection, connect in good condition? ODU wiring Check and re- E0 disappear?
  • Page 37 Air Conditioner Service Manual 3.2.2 E1, E2 ---IDU Room temperature sensor and/or coil temperature sensor failure. Start Display E1or E2 Is the sensor well Re-connect connected to PCB E1/E2 disappear? Multi-meter check the Replace the sensor sensor, is it open or short circuit? The malfunction eliminated?
  • Page 38 Air Conditioner Service Manual 3.2.3 E4 --- AC Cooling system abnormal (Gas not enough) Start Display E4 Check the pressure AC pressure correct? Check the sensor short or (cooling:0.8-1.3Mpa,/ open? heating 2.0-3.6Mpa) Replace the sensor Check the valves open or Replace the main PCB Open the valves Lower than 0.8 Mpa in...
  • Page 39 Air Conditioner Service Manual 3.2.4 E6----IDU ventilation failure (PG and DC fan motor only) Start Display E6 Turn the fan blades by hand while power-off condition Adjust the motor and blade Can the fan blades run assembly so that rotor can smoothly? run smoothly.
  • Page 40 Air Conditioner Service Manual 3.2.5 E3, E7 or E8----ODU Coil temperature sensor, Ambient temperature sensor or Discharge temperature sensor failure. When any of the sensor resistance open or short circuit , unit will display failure code as E3/E7 or E8, IDU and ODU turns off.
  • Page 41 Air Conditioner Service Manual 3.2.6 E9---ODU IPM /Compressor drive fault If unit have 6 times stopping works for IPM protection (P0) continuously, it will display E9 error, and unit can’t be recovered to operation, except press ON/OFF button. Display E9 Display F9 or FA first Replace ODU PCB then E9...
  • Page 42 Air Conditioner Service Manual 3.2.7 EF---ODU DC fan motor failure Shut off Check the fan blade by Re install the DC motor hand, can it rotate freely Works normal? Fan motor well Re-connect connect to PCB Works normal? 1. For built-in control (5pins) motor: check the V =310V? =15V?
  • Page 43 Air Conditioner Service Manual 3.2.8 EU---ODU voltage test sensor failure After power relay works, when tested voltage effective value less than 50V for 3s continuously, unit will display EU. Start Display EU Test voltage btw ODU Check while voltage terminal L/N, more than become normal 50V~? Unit works?
  • Page 44 Air Conditioner Service Manual 3.2.9 P0---IPM protection When overheat or overcurrent for IPM, AC unit will display P0protection. Display P0 Restart unit. It works normal? Wiring connection Re-connect U/V/W correct? P0 disappear? ODU fan motor no Replace ODU Can compressor works or too slowly? fan motor start up?
  • Page 45 Air Conditioner Service Manual 3.2.10 P1--- Over / under voltage protection 1. Test voltage between L &N, When the power supply V＞AC260V or V＜AC150V, AC will display P1 protection, unit will recover back to previous status while V＞AC155V. 2. Test voltage on the big size electrolytic capacitor of ODU PCB, When DC busbar voltage V＞DC420V or V ＜DC150V, unit will recover back to previous status while DC190V＜V＜DC410V Display P1 Wait until the AC...
  • Page 46 Air Conditioner Service Manual 3.2.11 P2---Over Current protection When the AC unit running current more than I , it will stop and display P2 protection. Note: for different AC model, I has difference valve. Display P2 ODU fan motor Replace fan motor works? P2 disappear? IDU filter or ODU...
  • Page 47 Air Conditioner Service Manual 3.2.12 P4 ---ODU Discharge temperature overheating protection Display P4 ODU temperature Normal protection higher than 60℃? ODU location Adjust ODU Enough space for Unit operate? acceptable? installation ventilation? Condenser too Clean IDU filter or P4 disappear? dirty? or filter ODU condenser.
  • Page 48 Air Conditioner Service Manual 3.2.13 P5---Sub-cooling protection on Cooling/Dry mode On Cooling or Dry mode, when IDU evaporator coil temperature IPT＜1℃ continuously for 3 min after compressor start up for 6 min, CPU will switch off outdoor unit and show P5 failure code. Display P5 Switch on unit after minutes...
  • Page 49 Air Conditioner Service Manual 3.2.14 P6---Overheating protection on Cooling mode On Cooling or Dry mode, when ODU condenser coil temperature OPT≥62℃ , MCU will switch off outdoor unit and show P6 failure code. Display ODU fan motor Fan motor Replace fan motor works normal? broken? P6 disappear?
  • Page 50 Air Conditioner Service Manual 3.2.15 P7---Overheating protection on Cooling mode ℃ On heating mode, when IDU evaporator coil temperature IPT≥62 , ODU PCB will switch off outdoor unit and show P7 failure code. Display P7 ODU fan motor Fan motor Replace fan motor works normal? broken?
  • Page 51 Air Conditioner Service Manual 3.2.16 P8---Outdoor Overtemperature/Under-temperature protection When environment temperature as below condition, the compressor will stop working, after 200s delay, the IDU will show P8 failure code. (1). On Cooling or Dry mode: ODU ambient temperature: OAT＜-20℃ or OAT＞63℃; (2).
  • Page 52 Air Conditioner Service Manual 3.2.17 P9---The compressor driving protection (the compressor load abnormal) When compressor start up or in the process of operation, if: (1). MCU can’t test the feedback signal from compressor, or (2). Tested a abnormal signal from compressor, or (3).
  • Page 53 Air Conditioner Service Manual 3.2.18 F4---Cooling system Gas flow abnormal protection When compressor startup, unit will check the variation of IDU coil temperature. If there is mistake installer forgetting to open the 2-way or 3-way valve on ODU, the gas can’t flow in the cooling system, it will show F4 protection. Start Display F4 Check the 2-way...
  • Page 54 Air Conditioner Service Manual 3.2.19 F5---PFC Protection PFC Overcurrent protection F5 Code Check the power supply, Display F5 by is it abnormal? (this is random? normal protection) Display F5 frequently Switch off the unit for 3 Still F5? minutes and re-switch on Still F5? Replace ODU PCB...
  • Page 55 Air Conditioner Service Manual 3.2.20 F6 The Compressor Lack of phase / Anti-phase protection. If ODU PCB can’t test one, or even three phase of compressor current, it will show F6 protection. Display F6 Check compressor Re-connect wiring connector, is it well connected? Problem solved? The Compressor...
  • Page 56 Air Conditioner Service Manual 3.2.21 F7---Module temperature protection. IPM overtemperature protection, when IPM temperature more than 95℃, it will show F7. Display F7 Clean or adjust the gap IPM well contact Any dust or gap btw btw IPM and heat sink to heat sink? IPM &...
  • Page 57 Air Conditioner Service Manual 3.2.22 F8---4-Way Value Reversing abnormal On heating mode, if IDU Coil temperature tested lower than Room temperature 5℃ or even more after compressor works for 8min, unit will show F8 code. Display F8 the 4-way valve Re-connect wiring connection correct?
  • Page 58 Air Conditioner Service Manual 9.2.23 Fy--- Gas leakage protection After compressor works in high frequency for 9 min, if the temperature on IDU evaporator & ODU condenser has only a little variation comparing previous, but, the compressor discharge temperature on high level, then the unit will show Fy failure code.

  • Page 59: Disassembly Idu & Odu

    Air Conditioner Service Manual 4. Disassembly IDU & ODU 4.1. IDU Disassembly Steps Reference photo 1. Before disassembly The orginal status. 2. Disassembly front panel, display board and WIFI module. Display box A. Open front panel. B. Remove one screw and take the display box out from the panel.
  • Page 60 Air Conditioner Service Manual 4. Remove the electric control box cover Unfix one screw on the cover of electric box, and remove the cover. screw 5. Remove the filter Push the filter upwards a little, you can take it out from unit. 6.
  • Page 61 Air Conditioner Service Manual 7. Disassembly the electric control box. Electric control box A. Remove the RT & IPT out from evaporator; B. Unscrew all the earth ground wirings on the evaporator. C. Take all the connectors out from PCB. D.
  • Page 62 Air Conditioner Service Manual 9. Disassembly the evaporator screws Screws + motor A. Unfix 2 screws of left side shown as cover picture. B. Unfix 2 screws of right side on motor cover/right support plate. C. Take the evaporator out from unit by uplifting the IUPUT/OUTPUT pipes slightly.

  • Page 63: Odu Assembly

    Air Conditioner Service Manual 4.2 ODU Assembly Step Reference picture step1：Remove the PCB Cover , valve Cover and top cover 1). Unfix one screw on the PCB cover, you can take the cover out from unit. 2). Unfix one screw on the valve cover, you can take it out easily.
  • Page 64 Air Conditioner Service Manual ODU middle separate plate and base plate, uplift front panel you can take it out from unit. step3：Disassemble the Left and Right plate. Unfix screws btw Right Plate and the Electric Box assembly, Valve Plate , Base Plate, then you can take the Right plate out.
  • Page 65 Air Conditioner Service Manual step4：Disassemble the Axis Fan Blade Unscrew the fan blade nut, and take the blade out. step5：Disassemble the electric box Unfix screw btw Electric Box and motor supporter etc. loosen the wiring clamp, then you can take the control box out.
  • Page 66 Air Conditioner Service Manual Shown as picture to take the cotton out step7：Disassemble the separate plate Unfix the screw btw separate plate and unit, and take it out step8：Disassemble the 2 and 3-way valve...
  • Page 67 Air Conditioner Service Manual Unfix screw btw Valve plate and base, you can take the 2-way and 3-way valve out by welding. Note: 1). The welding can only place while no gas in the unit. 2). Pay attention to the fire to prevent any injury.
  • Page 68 Air Conditioner Service Manual step11：Remove the fan motor and fan supporter. Unfix screws btw fan motor with supporter, and supporter with base plate. Note: Pay attention to the motor wiring, it can’t be taken out by force.

  • Page 69: Appendix

    Air Conditioner Service Manual APPENDIX Appendix 1 The comparison table of Celsius-Fahrenheit temperature Fahrenheit Fahrenheit Fahrenheit Celsius Celsius Celsius diplay Fahrenheit diplay Fahrenheit diplay Fahrenheit ℃ ℃ ℃ temperature temperature temperature (℉) (℉) (℉) (℉) (℉) (℉) 60.8 69/70 69.8 78/79 78.8 62/63...

  • Page 70: Appendix 3 Pipes Flaring

    Air Conditioner Service Manual Appendix 3 Pipes Flaring Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure. A. Cut the pipes and the cable. 1) Use the piping kit accessory or the pipes purchased locally. 2) Measure the distance between the indoor and the outdoor unit.

  • Page 71: Appendix 4 Thermistor Temperature Characteristics

    Air Conditioner Service Manual Appendix 4 THERMISTOR TEMPERATURE CHARACTERISTICS 1). Indoor unit and outdoor exchange temperature and outside air temperature sensor temperature characteristics TEMP. Resistance Voltage of TEMP. Resistance Voltage of TEMP. Resistance Voltage of ℃ ℃ ℃ (k Ohm) resistance (k Ohm) resistance...
  • Page 72 Air Conditioner Service Manual TH1: indoor room temperature sensor and outside air temperature sensor TH2: indoor exchange temperature sensor and outside exchange temperature sensor Before measuring resistance, disconnect connectors as shown above. Outdoor unit sensor temperature characteristics TEMP. R min R(t) R max TEMP.
  • Page 73 Air Conditioner Service Manual 63.74 70.48 77.87 6.309 6.655 7.013 1.073 1.12 1.168 60.69 67.05 6.08 6.409 6.748 1.042 1.089 1.136 57.81 63.8 70.34 5.861 6.173 6.495 1.013 1.058 1.104 55.08 60.72 66.88 5.651 5.947 6.253 0.9833 1.028 1.074 52.49 57.81 63.61 5.449...

This manual is also suitable for:

Mgtc0913c-20Mgtc0923e-20Mgtc0923c-20Mgtc1213e-20Mgtc1213c-20Mgtc1223e-20 ... Show all

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