Toshiba MMC-AP0188HPUL Service Manual
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Toshiba MMC-AP0188HPUL Service Manual

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FILE NO. SVM-20102
SERVICE MANUAL
AIR-CONDITIONER
(MULTI TYPE)
INDOOR UNIT
<Ceiling type>
MMC-AP0188HPUL
MMC-AP0248HPUL
MMC-AP0308HPUL
MMC-AP0368HPUL
MMC-AP0488HPUL
December, 20 20

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  • Page 1 FILE NO. SVM-20102 SERVICE MANUAL AIR-CONDITIONER (MULTI TYPE) INDOOR UNIT <Ceiling type> MMC-AP0188HPUL MMC-AP0248HPUL MMC-AP0308HPUL MMC-AP0368HPUL MMC-AP0488HPUL December, 20 20...

  • Page 2: Table Of Contents

    Original instruction Adoption of R410A Refrigerant This Air Conditioner adopted refrigerant HFC (R410A) instead of the conventional refrigerant R22 in order to prevent destruction of the ozone layer. CONTENTS SAFETY CAUTION ........3 1. CONSTRUCTION VIEWS (EXTERNAL VIEWS) ......13 2. WIRING DIAGRAM ......16 3.

  • Page 3: Safety Caution

    The qualified service person is a person who installs, repairs, maintains, relocates and removes the air conditioners made by Toshiba Carrier Corporation. He or she has been trained to install, repair, maintain, relocate and remove the air conditioners made by Toshiba Carrier Corporation...
  • Page 4 Definition of Protective Gear When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective gloves and ‘safety’ work clothing. In addition to such normal protective gear, wear the protective gear described below when undertaking the special work detailed in the table below.
  • Page 5 Warning Indications on the Air Conditioner Unit [Confirmation of warning label on the main unit] Confirm that labels are indicated on the specified positions If removing the label during parts replace, stick it as the original. WARNING WARNING ELECTRICAL SHOCK HAZARD ELECTRICAL SHOCK HAZARD Disconnect all remote electric power supplies Disconnect all remote electric...
  • Page 6 Precaution for Safety The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual. DANGER Before carrying out the installation, maintenance, repair or removal work, be sure to set the circuit breaker to the OFF position. Otherwise, electric shocks may result. Before opening the electrical control box cover of the indoor unit or service panel of the outdoor unit, set the circuit breaker to the OFF position.
  • Page 7 Electrical wiring work shall be conducted according to law and regulation in the community and Installation manual. Failure to do so may result in electrocution or short circuit. To connect the electrical wires, repair the electrical parts or undertake other electrical jobs, wear gloves to provide protection for electricians, insulating shoes and clothing to provide protection from electric shocks.
  • Page 8 Connect the cut-off lead wires with crimp contact, etc, put the closed end side upward and then apply a water-cut method, otherwise a leak or production of fire is caused at the users' side. Insulating measures When performing repairs using a gas burner, replace the refrigerant with nitrogen gas because the oil that coats the pipes may otherwise burn.
  • Page 9 When the refrigerant gas leaks, find up the leaked position and repair it surely. If the leaked position cannot be found up and the repair work is interrupted, pump-down and tighten the service valve, otherwise the refrigerant gas may leak into the room. The poisonous gas generates when gas touches to fire such as fan heater, stove or cocking stove though the refrigerant gas itself is innocuous.
  • Page 10 Only a qualified installer or service person is allowed to do installation work. Inappropriate installation may result in water leakage, electric shock or fire. Before starting to install the air conditioner, read carefully through the Installation Manual, and follow its instructions to install the air conditioner. If the unit is installed in a small room, take appropriate measures to prevent the refrigerant from exceeding the limit concentration even if it leaks.
  • Page 11 • R410A Refrigerant This air conditioner adopted HFC type refrigerant (R410A) which does not deplete the ozone layer. 1. Safety Caution Concerned to R410A Refrigerant The pressure of R410A is high 1.6 times of that of the former refrigerant (R22). Accompanied with change of refrigerant, the refrigerating oil has been also changed.
  • Page 12 4. Tools 1. Required Tools for R410A Mixing of different types of oil may cause a trouble such as generation of sludge, clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types. 1) Tools exclusive for R410A (Those which cannot be used for conventional refrigerant (R22)) 2) Tools exclusive for R410A, but can be also used for conventional refrigerant (R22) 3) Tools commonly used for R410A and for conventional refrigerant (R22) The table below shows the tools exclusive for R410A and their interchangeability.

  • Page 13: Construction Views (External Views)

    1. CONSTRUCTION VIEWS (EXTERNAL VIEWS) Indoor Unit MMC-AP0188HPUL - 13 -...
  • Page 14 MMC-AP0248HPUL, MMC-AP0308HPUL - 14 -...
  • Page 15 MMC-AP0368HPUL, MMC-AP0488HPUL - 15 -...

  • Page 16: Wiring Diagram

    2. WIRING DIAGRAM - 16 -...

  • Page 17: Parts Rating

    3. PARTS RATING MMC-AP***8HP* Parts name Model Specifi cations  ICF-340WD94-1   Fan motor ICF-340WD94-2   ICF-340WD139-2      Louver motor MP24Z3N Pulse motor valve PAM-MD12TF-301      12.9" (328 mm)  ...

  • Page 18: Refrigeration Cycle Diagram

    4. REFRIGERATION CYCLE DIAGRAM Liquid side Gas side Strainer Capillary tubes Heat exchanger at indoor side Pulse Motor Valve (PMV) Distributor Sensor (TCJ) Sensor (TC2) Sensor (TC1) Sensor Fan motor (TA) Functional part name Functional outline Pulse Motor Valve (Connector CN82 (6P): Blue) 1) Controls super heat in cooling operation 2) Controls under cool in heating operation 3) Recovers refrigerant oil in cooling operation...

  • Page 19: Control Outline

    5. CONTROL OUTLINE 5-1. Control Specifications Item Outline of specifications Remarks When power 1) Distinction of outdoor unit supply is reset When the power supply is reset, the outdoors are distinguished and the control is selected according to the distinguished result. 2) Setting of indoor fan speed and existence of air direction adjustment Based on EEPROM data, select setting of the indoor fan...
  • Page 20 Item Outline of specifications Remarks Room temp. 2) Using the CODE N . 06, the setup temperature in heating Shift of suction control operation can be corrected. temperature in heating (Continued) operation Setup data Setup temp. correction +0°C +2°C +4°C +6°C Except while sensor of (+0°F)
  • Page 21 Item Outline of specifications Remarks Air speed 1) Operation with (HH), (H), (L) or [AUTO] mode is carried HH > H+ > H > L+ > L > UL selection out by the command from the remote controller. 2) When the air speed mode [AUTO] is selected, the air speed varies by the difference between Ta and Ts.
  • Page 22 Item Outline of specifications Remarks Air speed selection Selection of high ceiling type CODE No. : (Continued): [5d] or selection of high ceiling on P .C. board SW501 Standard Type 1 Type 3 CODE No. [5d] 0000 0001 0003 SW501 (1)/(2) OFF/OFF ON/OFF OFF/ON...
  • Page 23 Item Outline of specifications Remarks Freeze prevention 1. In all cooling operation, the air conditioner operates TC1: Temperature of indoor control (Low temp. as described below based upon temp. detected by heat exchanger sensor release) TC1, TC2 and TCJ sensors. When “J”...
  • Page 24 Item Outline of specifications Remarks Recovery control The indoor unit which is under STOP/Thermo. OFF The indoor unit which is for heating status or which operates in [FAN] mode performs the under thermo. OFF (COOL) refrigerant (Oil) following controls when it received the heating status or which operates in refrigerant (Oil) recovery signal from the outdoor unit.
  • Page 25 Item Outline of specifications Remarks Display of < READY> Displayed on the remote controller < READY> display [READY] 1) When the following check codes are indicated No display for wireless [HEAT READY] type remote controller Open phase of power supply wiring [P05] was detected. There is an indoor unit that detected the indoor overflow [P10].
  • Page 26 Item Outline of specifications Remarks Louver control: 1) Louver position setup When the louver position is changed, the position moves necessarily to downward discharge position once to return to the set position. The louver position can be set up in the following operation range.
  • Page 27 Item Outline of specifications Remarks DC motor 1) DC motor operates according to the command from Check code [P12] the indoor controller. (Note) If the fan rotates by entry of outside air, etc while the air conditioner stopped, the indoor unit may operate as the fan motor stops.

  • Page 28: Configuration Of Control Circuit

    6. CONFIGURATION OF CONTROL CIRCUIT 6-1. Indoor Unit 6-1-1. Indoor Controoler Block Diagram 1. Connection of wired remote controller Wired (Simple) header remote controller (Up to 2 units) Schedule timer Display LCD Function setup Display driver Key switch Display LED Function setup DC5V Power...
  • Page 29 2. Connection of wired remote controller kit Indoor unit #1 (Header) Wireless remote (Follower) (Follower) controller kit Indoor control P.C. board Receiving (MCC-1643) P.C. board DC20V Remote controller Remote controller communication circuit communication circuit Emergent Power operation EEPROM circuit DC5V DC5V TA sensor DC12V...
  • Page 30 3. Connection of both wired remote controller and wireless remote controller kit Schedule timer Wired (Simple) header remote controller Display LCD Function setup Display driver Key switch EEPROM Function setup DC5V DC5V Power Display LED Key switch circuit Remote controller Secondary Power communication circuit...
  • Page 31 6-2. Indoor P.C. board MCC-1643 - 31 -...
  • Page 32 6-3. Functions at test run Cooling/Heating test run check The test run for cooling/heating can be performed from either indoor remote controller or outdoor interface P .C. board. 1. Start/Finish operation of test run Test run from indoor remote controller Wired remote controller: Refer to the below item of “Test run”...
  • Page 33 In case of wireless remote controller 1. When TEMPORARY button is pushed for 10 seconds or more, “Pi!” sound is heard and the operation changes to a forced cooling operation. After approx. 3 minutes, a cooling operation starts forcedly. Check cool air starts blowing. If the operation does not start, check wiring again. 2.
  • Page 34 Check function for operation of indoor unit (Functions at indoor unit side) This function is provided to check the operation of the indoor unit singly without communication with the remote controller or the outdoor unit. This function can be used regardless of operation or stop of the system. However, if using this function for a long time, a trouble of the equipment may be caused.
  • Page 35 6-4. Optional Connector Specifications of Indoor P.C. Board - 35 -...

  • Page 36: Applied Control

    7. APPLIED CONTROL 7-1. Setup of Selecting Function in Indoor Unit (Be Sure to Execute Setup by a Wired Remote Controller) <Procedure> Execute the setup operation while the unit stops. TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT FILTER RESET TEST...
  • Page 37 Table: Function selecting CODE No. (DN) (Items necessary to perform the applied control at the local site are described.) Item Description At shipment Filter display delay timer 0000 : None 0001 : 150H 0002 : 2500H 0002 : 2500H 0003 : 5000H 0004 : 10000H Dirty state of filter 0000 : Standard...
  • Page 38 Item Description At shipment High ceiling selection AP018 to AP030 to 0000: Standard Model MMC- DATA (Selection of air volume) AP024 AP048 Standard Up to 3.5 m Up to 3.5 m 0000 (Factory default) High ceiling (1) Up to 4.0 m Up to 4.3 m 0003 Timer setup...
  • Page 39 7-2. Applied Control in Indoor Unit Remote location ON/OFF control box (TCB-IFCB-4UL) [Wiring and setup] Use the exclusive connector for connection with the indoor control P.C. board. In a group control, the system can operate when connecting with any indoor unit (Control P.C. board) in the group.
  • Page 40 Ventilating fan control from remote controller [Function] The start/stop operation can be operated from the wired remote controller when air to air heat exchanger or ventilating fan is installed in the system. The fan can be operated even if the indoor unit is not operating. Use a fan which can receive the no-voltage A contact as an outside input signal.
  • Page 41 Leaving-ON prevention control [Function] This function controls the indoor units individually. It is connected with cable to the control P.C. board of the indoor unit. In a group control, it is connected with cable to the indoor unit (Control P.C. board), and the CODE No. 2E is set to the connected indoor unit.
  • Page 42 Address setup (Manual setting from remote controller) In case that addresses of the indoor units will be determined prior to piping work after cabling work (Example of 2-lines cabling) (Real line: Cabling, Broken line: Refrigerant pipe) Set an indoor unit per a remote controller. Outdoor Outdoor Turn on power supply.
  • Page 43 Confirmation of indoor unit No. position 1. To know the indoor unit addresses though position of the indoor unit is recognized In case of individual operation (Wired remote controller : indoor unit = 1 : 1) (Follow to the procedure during operation) <Procedure>...
  • Page 44 How to check all the unit No. from an arbitrary wired remote controller <Procedure> Carry out this procedure during stop of system. The indoor unit No. and the position in the identical refrigerant piping can be checked. An outdoor unit is selected, the identical refrigerant piping and the indoor unit No. are displayed one after the other, and then its fan and louver are on.
  • Page 45 Changing the indoor unit address using a remote controller To change an indoor unit address using a wired remote controller. The method to change the address of an individual indoor unit (the indoor unit is paired with a wired remote controller one-to-one), or an indoor unit in a group. (The method is available when the addresses have already been set automatically.) TEMP.
  • Page 46 How to change all indoor addresses from an arbitrary wired remote controller (It is possible when setting has finished by automatic addresses.) Contents: The indoor unit addresses in each identical refrigerant piping line can be changed from an arbitrary wired remote controller. Enter in address check/change mode and then change the address.
  • Page 47 Function to clear error 1. Clearing method from remote controller How to clear error of outdoor unit In the unit of refrigerant line connected by indoor unit of the remote controller to be operated, the error of the outdoor unit currently detected is cleared. (Error of the indoor unit is not cleared.) The service monitor function of the remote controller is utilized.
  • Page 48 Monitoring function of remote controller switch When using the remote controller (Model Name: RBC-AMT32UL), the following monitoring function can be utilized. Calling of display <Contents> The temperature of each sensor of the remote controller, indoor unit and outdoor unit and the operating status can be checked by calling the service monitor mode from the remote controller.
  • Page 49 < Based on the SMMS-e > CODE No. Data name Display format Unit Remote control display example Room temperature (Use to control) ×1 °C [0027] = 27 °C Room temperature (Remote control) ×1 °C Indoor suction air temperature (TA) ×1 °F Indoor coil temperature (TCJ) ×1...

  • Page 50: Troubleshooting

    8. TROUBLESHOOTING 8-1. Troubleshooting Summary 1. Before troubleshooting 1) Applied models SMMS (i) Multi type models Indoor unit : MMX-APXXX, Outdoor unit : MMY-MAPXXXXT8X, MMY-MAPXXXHT7X Super Heat Recovery Multi type models Indoor unit : MMX-APXXX, Outdoor unit : MMY-MAPXXXFT8X Mini-SMMS Multi type models Indoor unit : MMX-APXXX, Outdoor unit : MCY-MAPXXXHT, MCY-MAPXXXHT2X...
  • Page 51 - 51 -...
  • Page 52 - 52 -...
  • Page 53 List of check codes (outdoor unit) IPDU: Intelligent Power Drive Unit (Inverter P.C. board) (Errors detected by SMMS outdoor interface - typical examples) : Flashing, : Goes off :Lighting, ALT.: Flashing is alternately when there are two flashing LED SIM: Simultaneous flashing when there are two flashing LED Check code Display of receiving unit Outdoor 7-segment display...
  • Page 54 Check code Display of receiving unit TCC-LINK Outdoor 7-segment display Indicator light block Typical fault site Description of error central control or main remote Operation Timer Ready Sub-code Flash controller display Outdoor suction Outdoor suction temperature sensor (TS1) has – temperature sensor (TS1) been open / short-circuited.
  • Page 55 Check code Display of receiving unit TCC-LINK Outdoor 7-segment display Indicator light block Typical fault site Description of error central control or main remote Operation Timer Ready Sub-code Flash controller display Address setting has not been performed for one or SIM Indoor group address not –...
  • Page 56 (Errors detected by IPDU featuring in SMMS standard outdoor unit - typical examples) Check code Display of receiving unit TCC-LINK Outdoor 7-segment display Indicator light block Typical fault site Description of error central control or main remote OperationTimer Ready Flash Sub-code controller display...
  • Page 57 8-3. Troubleshooting by check Display on Remote Controller In case of wired remote controller (RBC-AMT32UL) 1. Confirmation and check When a trouble occurred on the air conditioner, the check code and the indoor unit No. are displayed on the display section of the remote controller.
  • Page 58 � In case of central remote controller (TCB-SC642TLE2) ZONE ZONE GROUP CODE 1234 TEST UNIT No. SET DATA SETTING R.C. GROUP SELECT ZONE 1. Confirmation and check When a trouble occurred on the air conditioner, the check code and the indoor unit No. are displayed on the display section of the remote controller.
  • Page 59 Indoor unit display part (Receiving unit) (Wireless type) When specifying the check code, check 7-segment display on the center unit. For the check code which is not displayed on the outdoor 7-segment, confirm it in Section “ 8-2 How to Check / Check code display list (Indoor unit) ”.
  • Page 60 Lamp indication Check code Cause of trouble occurrence ⎫ Operation Timer Ready Heat exchanger sensor (TCJ) error ⎪ ⎪ Heat exchanger sensor (TC2) error ⎬ Temp. sensor error in indoor unit ⎪ Heat exchanger sensor (TC1) error ⎪ ⎭ Alternate flash Room temp.
  • Page 61 Others (Except check code) Lamp indication Check code Cause of trouble occurrence Operation Timer Ready — During test run Simultaneous flash Operation Timer Ready COOL/HEAT disagreement — (Automatic cooling/heating setup to automatic cooling/heating unavailable model, heating setup to cooling only model) Alternate flash - 61 -...
  • Page 62 8-4. Check codes displayed on remote controller and SMMS outdoor unit (7-segment display on I/F board) and locations to be checked For other types of outdoor units, refer to their own service manuals. Check code Location Error detection Outdoor 7-segment display Main Description System status...
  • Page 63 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Duplicated Indoor Duplicated All stop More than one indoor unit is Check indoor addresses. unit indoor address assigned same address. indoor address Check for any change made to remote controller...
  • Page 64 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Indoor Error in Stop of Periodic communication Check remote controller unit communication corresponding between indoor header and wiring. Check indoor power supply between indoor unit...
  • Page 65 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code SMMS (Series 1) IPDU All stop Communication is disrupted Check wiring and connectors 01: A3-IPDU1 error communication between IPDUs (P.C. involved in communication 02: A3-IPDU2 error error...
  • Page 66 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code TL sensor All stop Sensor resistance is infinity Check connection of TL sensor error or zero (open / short connector.
  • Page 67 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Pd sensor All stop Output voltage of Pd Check connection of Pd sensor connector. error sensor is zero (sensor open-circuited).
  • Page 68 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Low oil level All stop Operating compressor <All outdoor units in protection detects continuous state of corresponding line to be low oil level for about 2 hours.
  • Page 69 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Compressor 2 All stop Compressor 2 case Check Compressor 2 case thermo case thermo circuit. thermo was activation activated.
  • Page 70 Check code Location Outdoor 7-segment display Error detection Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code SMMS Oil detection All stop The temperature Check the TK1 sensor installation. (1 series) Check the TK1 sensor resistant circuit error change of TK1 characteristics.
  • Page 71 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code SMMS-i Oil level All stop No temperature Check for disconnection of TK4 sensor. detection change is detected (4 series) Check resistance characteristics of circuit error by TK4 despite...
  • Page 72 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Outdoor All stop Jumper wire provided on P.C. Check model setting of P.C. capacity not set board for servicing I/F P.C. board for servicing outdoor board has not been removed I/F P.C.
  • Page 73 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Detected indoor Indoor External Stop of Signal is present at When external device is address unit interlock of corresponding external error input connected to CN80, (CN4)
  • Page 74 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Open phase detected, All stop Phase sequence Check the phase sequence of Phase sequence error error was detected outdoor power wiring.
  • Page 75 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Outdoor liquid All stop <During cooling operation> Check full-close operation backflow When system is in cooling of outdoor PMV (1, 2, 4). detection error operation, high pressure is Check for defect in Pd or...
  • Page 76 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code Detected 4-way valve All stop Abnormal refrigerating cycle Check for defect in main outdoor unit reversing error data is collected during body of 4-way valve.
  • Page 77 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection controller Sub-code code SMMS (Series 1) Outdoor fan All stop (Sub code: 08) Check the fan motor. Check the connector 08: Out of step IPDU error FAN IPDU position detection connection for fan motor.
  • Page 78 Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code ∗ SMMS-i IPDU Outdoor fan All stop Check fan motor. (Sub code: 0 (Series 4) IPDU error Check for defect in fan Fan IPDU over current ∗...
  • Page 79 Errors detected by TCC-LINK central control device Check code Location Error detection Outdoor 7-segment display Main Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code TCC-LINK TCC-LINK Continued Central control device is Check for defect in central operation unable to transmit signal.
  • Page 80 8-5 Diagnostic Procedure for Each Check Code (Indoor Unit) *Please refer to the multi outdoor unit service manual excluding these. Check code [E11 error] Is the connection for the UART communication Repair of connector connector (Internal board connection. CN521 red/Optional board CN1 red) normal? Is connector...
  • Page 81 [P12 error] Power off. Is not connection error or Repair the connector disconnection on the connector connection. CN210 of indoor unit P.C. board? Disconnect the connector CN210 to the indoor P.C. board Does the Replace the indoor fan turn smoothly when fan motor.
  • Page 82 Sensor charateristics Indoor unit Temperature sensor characteristics Indoor TA sensor Temperature [˚C] Resistance [kΩ] 33.9 Resistance 26.1 [kΩ] 20.3 15.9 12.6 10.0 Temperature [˚C] Temperature [˚C] Resistance [kΩ] –20 99.9 –15 74.1 Indoor TC1 sensor –10 55.6 –5 42.2 32.8 25.4 19.8 15.6...
  • Page 83 <Maintenance/Check list> Aiming in environmental preservation, it is strictly recommended to clean and maintain the indoor/outdoor units of the operating air conditioning system regularly to secure effective operation of the air conditioner. It is also recommended to maintain the units once a year regularly when operating the air conditioner for a long time.

  • Page 84: Detachments

    9. DETACHMENTS DANGER CAUTION Before carrying out the repair or removal Be sure to put on the gloves at work, be sure to set the circuit breaker to disassembling work; otherwise an injury the OFF position. will be caused by a part, etc. Otherwise, electric shocks may result.
  • Page 85 Part name Procedure Remarks Electric parts 1. Detachment 1) Perform works of 1 of 2) Remove the screws of electric parts box. 3) Draws out forward after the electric box is moved in the direction of the arrow, and the back of the part electric part boxis hung on the edge of the main body.
  • Page 86 Procedure Remarks Part name Fan, ⑤ Square hole Fan case, Quantity of fan Model Shaft Support plate 24, 27 36 ～48 1. Detachment NOTE Front side screw It explains the following content by 24 to 56 type. 1) Perform works of 1 of ① and ②. 2) Remove the support plate.
  • Page 87 Procedure Remarks No. Part name 2. Attachment 1) The fan is installed in the shaft so that Shaft the tightening screw may come at the right of the fan toward the heat exchanger. 2) Insert the fan in the shaft while adjusting to match the installation mark to the Groove of the fan groove of the fan.
  • Page 88 Procedure Remarks No. Part name ⑥ Bearing 1. Detachment Fan case NOTE Side cover It explains the following content by 24 to 48 type. 1) Perform works of 1 of ⑤.（24 to 48 type) 2) Bearing press from the side cover side. And remove it.
  • Page 89 Part name Procedure Remarks Fan motor 1. Detachment 1) Perform works of 1 of 2) Remove connectors for fan motor wiring from control P.C. board. CN210 : Fan motor (5P, White) NOTE Rein forced pate First unlock the housing and then (24 to 56 type only) remove the connectors.
  • Page 90 Part name Procedure Remarks Side cover 1. Detachment 1) Perform works of 1 of 2) Remove the screws of the side cover. (One side: Ø4 x 10, 1 pcs.) 3) Slide to the air discharge side, remove the side cover. Screw 2.
  • Page 91 Part name Procedure Remarks Under panel 1. Detachment 1) Perform works of 1 of 2) Remove the support plate. (24-48 type only) (Ø4 x 10, 1 pc.) The Square hole Front side screw screw on a front side is removed, and it detaches it from the square hole on the back side.
  • Page 92 Part name Procedure Remarks Drain pan 1. Detachment 1) Perform works of 1 of 2) Remove the drain cap and then extract the drain water accumulated in the drain pan. NOTE Drain cap When removing the drain cap, be sure to receive drain water using a bucket, etc.
  • Page 93 No. Part name Procedure Remarks Heat 1. Detachment exchanger 1) Recover the refrigerant gas and then remove the refrigerant pipe of the indoor unit. 2) Perform works of 1 of Pull out sensor wires from the holder. 3) The screw that is the fixing of the piping support is removed, and the piping support is removed.

  • Page 94: Replacement Of Service P.c. Board

    10. REPLACEMENT OF SERVICE P.C. BOARD CAUTION <Model name: MMC-AP∗∗∗HP∗> <Note: when replacing the P.C. board for indoor unit servicing> The nonvolatile memory (hereafter called EEPROM, IC503) on the indoor unit P .C. board before replacement includes the model specific type information and capacity codes as the factory-set value and the important setting data which have been automatically or manually set when the indoor unit is installed, such as system/ indoor/group addresses, high ceiling select setting, etc.
  • Page 95 [1] Setting data read out from EEPROM The setting data modified on the site, other than factory-set value, stored in the EEPROM shall be read out. TEST Step 1 Push button on the remote controller simultaneously for more than 4 seconds. ∗...
  • Page 96 (Case 1) B) In case that power of the indoor units cannot be turned on individually a) Remove temporarily the group wire connected to the terminal blocks A and B of the exchanged indoor unit. b) After connecting the remote controller wire only to the removed terminal block, turn on power of the indoor units and proceed to [3].
  • Page 97 Step 4 Write the on-site setting data to the EEPROM, such as address setting, etc. Perform the steps 1 and 2 above again. Step 5 Change the CODE No. (DN) to “ ” by pushing buttons for the temperature setting. (this is the setting for the filter sign lighting time.) Step 6 Check the setting data displayed at this time with the setting data put down in [1].
  • Page 98 Table 1. Setting data (CODE No. table (example)) Item Setting data Factory-set value Filter display delay timer 0002 : 2500H Dirty state of filter 0000 : Standard Central control address 00Un/0099 : Unfixed Specific indoor unit priority 0000 : No priority Heating suction temperature shift Automatic mode 0001 : No automatic...

  • Page 99: Exploded Views And Parts List

    11. EXPLODED VIEWS AND PARTS LIST MMC-AP0188HPUL - 99 -...
  • Page 100 Model name Location Part No. Description MMC-AP0188HPUL 43T72314 ASM-SUB-PAN-DR 43T44702 REFRIGERATION CYCLE ASSY 43T02301 ASM-P-SIDE-R 43T02302 ASM-P-SIDE-L 43T07313 ASM-SUP-FLAP 43T07314 SUP-SHAFT 43T07315 HINGE-GRILLE 43T07316 HOOK-GRILLE 43T08420 LED-BASE 43T08432 LED PANEL 43T09493 SUCTION-GRILLE 43T00638 ASM-COAT-P-UP 43T00641 ASM-COAT-P-UD 43T11326 ASM-FORM-UP 43T11329 ASM-FORM...
  • Page 101 MMC-AP0248HPUL, MMC-AP0308HPUL - 101 -...
  • Page 102 Model name Location Part No. Description MMC-AP0248HPUL MMC-AP308HPUL 43T72315 ASM-SUB-PAN-DR 43T44703 REFRIGERATION CYCLE ASSY 43T02301 ASM-P-SIDE-R 43T02302 ASM-P-SIDE-L 43T07313 ASM-SUP-FLAP 43T07314 SUP-SHAFT 43T07315 HINGE-GRILLE 43T07316 HOOK-GRILLE 43T08420 LED-BASE 43T08432 LED PANEL 43T09493 SUCTION-GRILLE 43T09494 SUCTION-GRILLE 43T00639 ASM-COAT-P-UP 43T00642 ASM-COAT-P-UD 43T11327 ASM-FORM-UP 43T11329 ASM-FORM...
  • Page 103 MMC-AP0368HPUL, MMC-AP0488HPUL - 103 -...
  • Page 104 Model name Location Part No. Description MMC-AP0368HPUL MMC-AP0488HPUL 43T72316 ASM-SUB-PAN-DR 43T44704 REFRIGERATION CYCLE ASSY 43T02301 ASM-P-SIDE-R 43T02302 ASM-P-SIDE-L 43T07313 ASM-SUP-FLAP 43T07314 SUP-SHAFT 43T07315 HINGE-GRILLE 43T07316 HOOK-GRILLE 43T08420 LED-BASE 43T08432 LED PANEL 43T09494 SUCTION-GRILLE 43T00640 ASM-COAT-P-UP 43T00643 ASM-COAT-P-UD 43T11328 ASM-FORM-UP 43T11329 ASM-FORM 43T11330 ASM-FORM...
  • Page 105 Electric Parts Model name Location MMC-AP Part No. Description 0188HPUL 0248HPUL 0308HPUL 0368HPUL 0488HPUL 43T50411 TC-SENSOR 43T60435 SERV-TERMINAL 43T60362 TERMINAL 43T60540 ASM-HOUSING(PW) 43T50351 HOLDER-TA 43T61317 BASE-CLAMP 43T6W916 PC BOARD ASSY 43T50390 TA-SENSOR 43T50386 TC-SENSOR (TCJ) 43T50387 TC-SENSOR (TC2) 43T60524 ASM-HOUSING(REM) 43T60541 ASM-HOUSING(BUS) 43459017...
  • Page 106 WARNINGS ON REFRIGERANT LEAKAGE Check of Concentration Limit Important The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas NOTE 2 : leaking out, its concentration will not exceed a set limit. The standards for minimum room volume are as follows.
  • Page 107 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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