Toshiba MMU-AP0071YHPUL Service Manual
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Toshiba MMU-AP0071YHPUL Service Manual

Toshiba MMU-AP0071YHPUL Service Manual

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AIR CONDITIONER (MULTI TYPE)
SERVICE MANUAL
Indoor unit
<1-way cassette type>
MMU-AP0071YHPUL
MMU-AP0091YHPUL
MMU-AP0121YHPUL
FILE NO. SVM-21073-2
Revised on November, 2021

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Summary of Contents for Toshiba MMU-AP0071YHPUL

  • Page 1 FILE NO. SVM-21073-2 AIR CONDITIONER (MULTI TYPE) SERVICE MANUAL Indoor unit <1-way cassette type> MMU-AP0071YHPUL MMU-AP0091YHPUL MMU-AP0121YHPUL Revised on November, 2021...

  • Page 2: Table Of Contents

    CONTENTS PRECAUTIONS FOR SAFETY ..................1. SPECIFICATIONS ....................... CONSTRUCTION VIEWS (EXTERNAL VIEWS) ............WIRING DIAGRAMS ....................PARTS RATING ......................REFRIGERANT CYCLE DIAGRAM ................CONTROL OUTLINE ....................7. CONFIGURAION OF CONTROL CIRCUIT ............... 7-1. Indoor controller block diagram (MCC-1643) ..............7-1-1. In Case of Connection of Wired Remote Controller ..........7-1-2.
  • Page 3 • 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 Disconnect all remote electric power supplies before servicing.

  • Page 6: Precautions For Safety

    PRECAUTIONS 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 for both the indoor and outdoor units to the OFF position. Otherwise, electric shocks may result.
  • Page 7 WARNIG Before starting to repair the air conditioner, read carefully through the Service Manual, and repair the air conditioner by following its instructions. Only qualified service person (*1) is allowed to repair the air conditioner. Repair of the air conditioner by unqualified person may give rise to a fire, electric shocks, injury, water leaks and / or other problems.
  • Page 8 Do not modify the products.Do not also disassemble or modify the parts. It may cause a fire, electric shock or injury. Prohibition of modification. When any of the electrical parts are to be replaced, ensure that the replacement parts satisfy the specifications given in the Service Manual (or use the parts contained on the parts list in the Service Manual).
  • Page 9 After repair work, surely assemble the disassembled parts, and connect and lead the removed wires as before. Perform the work so that the cabinet or panel does not catch the inner wires. If incorrect assembly or incorrect wire connection was done, a disaster such as a leak or fire is caused Assembly / at user’s side.
  • Page 10 When the service panel of the outdoor unit is to be opened in order for the compressor or the area around this part to be repaired immediately after the air conditioner has been shut down, set the circuit breaker to the OFF position, and then wait at least 10 minutes before opening the service panel. If you fail to heed this warning, you will run the risk of burning yourself because the compressor pipes and other parts will be very hot to the touch.
  • Page 11 • New Refrigerant (R410A) This air conditioner adopts a new HFC type refrigerant (R410A) which does not deplete the ozone layer. 1. Safety Caution Concerned to New 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: Specifications

    1. SPECIFICATIONS 1 Way cassette type MMU-AP0091YHPUL MMU-AP0121YHPUL MMU-AP0071YHPUL Model name 7500 9500 12000 Cooling Capacity (Btu/h) 8500 10500 13500 Heating Capacity (Btu/h) 1Ph. (208V-230V) ~ 60Hz. Power supply Running current 0.19 0.20 0.21 Electrical 0.017 0.018 characteristics Power consumption (kW) 0.019...

  • Page 14: Construction Views (External Views)

    2. CONSTRUCTION VIEWS (EXTERNAL VIEWS) 1-way cassette type (Unit : lnch (mm)) 19.7″ (500) 19.7″ (500) 19.7″ (500) or more or more or more Obstacle The space that is necessary for equipping and service 46.9" (1190) Ceilling opening dimension 11.8″ (300 mm) or less Indoor unit Underside of ceiling...

  • Page 15: Wiring Diagrams

    3. WIRING DIAGRAM - 15 -...

  • Page 16: Parts Rating

    4. PARTS RATING MMU- Model AP007 AP009 AP012 ICF-340-30-6A Fan motor 24BYJ48-ST Motor for horizontal grille PAM-B25YGTF-1 Pulse motor valve Lead wire length : 8.6" (218 mm) Vinyl tube TA sensor Ø0.16" (4 mm) size lead wire length : 39.4" (1000 mm ) Vinyl tube (Brown) TC1 sensor Ø0.24"...

  • Page 17: Refrigerant Cycle Diagram

    5. REFRIGERANT CYCLE DIAGRAM Indoor unit Liquid side Gas side Cooling Heating Strainer Capillary tube Heat exchanger at indoor side Pulse Motor Valve (PMV) Distributor Sensor (TCJ) Sensor (TC2) Sensor (TC1) Sensor Fan motor (TA) Explanation of functional parts in indoor unit Functional part name Functional outline Pulse Motor Valve...

  • Page 18: Control Outline

    6. CONTROL OUTLINE 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 19 Item Outline of specifications Remarks Room temp. 2) Using the Item code 06, the setup temperature in heating Shift of return air control operation can be compensated. temperature in heating (Continued) operation SET DATA Temperature setting adjustment +0 ˚F +3.6 ˚F +7.2 ˚F +10.8 ˚F [+0˚C]...
  • Page 20 Item Outline of specifications Remarks Fan speed 1) By the command from remote control, fan speed is HH > H+ > H > L+ > L > UL selection changed. ((HH), (H+), (H), (L+), (L) or [AUTO]) 2) When the fan speed mode [AUTO] is selected, the fan Depending on the remote speed varies by the difference between TA and Ts.
  • Page 21 Item Outline of specifications Remarks 1. In heating operation, the higher temperature of TC2 Prevention of cold TCJ: Temperature of indoor air discharge sensor and TCJ sensor is compared with temperature heat exchanger sensor of TC1 sensor and then the lower temperature is used •...
  • Page 22 Item Outline of specifications Remarks Refrigerant (Oil) Indoor units during stop/thermostat OFF or FAN Control is performed per two recovery control in operation perform following controls when a refrigerant hours or when the outdoor unit cooling operation (compressor oil) recovery signal is received from determines its need.(It varies outdoor unit at the cooling operation, depending on the indoor units...
  • Page 23 Item Outline of specifications Remarks Alarm output The alarm output from the indoor P.C. board is output in each Connector CN61 (Refer to 8-3-1,8-3-2. Optional setup indoor unit during group control, but it can be set so as to be connector specifications of output in the header unit and follower units.
  • Page 24 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 25 Item Outline of specifications Remarks Louver control • If there is the locked louver in the unit, [ ] goes on the For the setting operation, remote controller screen. refer to [How to set louver (Continued) lock] of Installation Manual. •...

  • Page 26: Configuraion Of Control Circuit

    7. CONFIGURATION OF CONTROL CIRCUIT 7-1. Indoor controller block diagram (MCC-1643) 7-1-1. In case of connection of wired remote controller Wired remote controller (Up to 2 units) Schedule timer Display LCD Function setup Display driver Key switch Display LED Function setup DC5V Power circuit...

  • Page 27: In Case Of Connection Of Wireless Remote Controller

    7-1-2. In case of connection of wireless remote controller Indoor unit #1 (Header) Wireless remote (Follower) (Follower) controller kit Receiving Indoor control P.C. board P.C. board (MCC-1643) DC20V Remote controller Remote controller communication circuit communication circuit Emergent Power operation circuit EEPROM DC5V DC5V...

  • Page 28: Connection Of Both Wired Remote Controller And Wireless Remote Controller

    7-1-3. Connection of both wired remote controller and wireless remote controller Wired header remote controller Schedule timer Function setup Display LCD Display driver Key switch EEPROM Function setup DC5V DC5V Power Display LED Key switch circuit Power Remote controller Secondary circuit communication circuit battery...

  • Page 29: Indoor Print Circuit Board

    7-2. Indoor Print Circuit Board MCC-1643 - 29 -...
  • Page 30 - 30 -...

  • Page 31: Test Run Of Indoor Unit

    7-3. Test run of indoor unit 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. Refer to the Installation Manual and Service Manual of outdoor unit for the procedure of the test run from an outdoor interface P.C.
  • Page 32 <RBC-AMS5*E-UL> Push the [ MENU] button to display the menu screen. Field setting menu(1/2) 1.Test mode Push and hold the [ MENU] button 2.Register service info. 3.Alarm history and the [ ] button at the same time 4.Monitor function 5.Setting louver position to display the “Field setting menu”.
  • Page 33 Push the [ ON / OFF] button to start Room A 12:00 the test mode. The screen (1) shown in the left appears. (The screen (2) appears when the operation is stopped.) Test → Perform the test mode in the “Cool” or “Heat” mode.
  • Page 34 In case of wireless remote controller Turn on the power of the air conditioner. When power is turned on for the first time after installation, it takes approx. 5 minutes until the remote controller becomes available. In the case of subsequent power-on, it takes approx. 1 minute until the remote controller becomes available.
  • Page 35 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 36: Method To Set Indoor Unit Function Dn Code

    7-4. Method to set indoor unit function DN code (When performing this task, be sure to use a wired remote controller.) Procedure Be sure to stop the air conditioner before making settings <RBC-AMT > Push the buttons simultaneously and hold for at CODE No.
  • Page 37 <RBC-AMS5*E-UL> Push the [ MENU] button to display the menu screen. Field setting menu(2/2) Push and hold the [ MENU] button and the 6. Setting timer operation mode 7. DN setting ] button at the same time to display the 8.
  • Page 38 Indoor unit function Code No. (DN Code) table (includes functions needed to perform applied control on site) Description Item At shipment Filter display delay timer 0000: None 0001: 150H Depending on model 0002: 2500H 0003: 5000H type 0004: 10000H t l i f 0001: High degree of dirt (Half of standard time) Central control address 0001: No.1 unit...
  • Page 39 Item Description At shipment Temperature unit select 0000: °C 0001: °F 0001: °F External static pressure Refer to next page. Depending on model type High-ceiling adjustment (Air flow selection) Timer setting 0000: Available 0001: Unavailable 0000: Available (wired remote controller) (can be performed) (cannot be performed) Dual set point...
  • Page 40 [5d] External static pressure & High-ceiling adjustment Type DN code "10" Value Type Model MMU-AP****YHPUL 0003 1-way cassette Indoor Unit Capacity DN code "11" 1-way cassette type Value Capacity 0000* Invalid 0001 0071 type 0003 0091 type 0005 0121 type * "0000"...
  • Page 41 Manual address setting using the remote controller Procedure when setting indoor units’ addresses first under the condition that indoor wiring has been completed and outdoor wiring has not been started (manual setting using the remote controller) Wiring example of 2 refrigerant lines Refrigerant line 1 Refrigerant line 2 Outdoor...
  • Page 42 <Indoor unit address> 13 13 13 13 13 Push the TEMP. buttons repeatedly to set the CODE No. to Push the TIME buttons repeatedly to set an indoor unit address. Push the button. (It is OK if the display turns on.) <Group address>...
  • Page 43 Push the [ MENU] button to set the other Code(DN) and Data. After “Continue?” is displayed on the screen, push the “ Yes” [ F1] button. (Indoor address) → Move the cursor to select “Code(DN)” with the “ <” [ F1] button, then set “0013”...
  • Page 44 Confirming the indoor unit addresses and the position of an indoor unit using the remote controller Confirming the numbers and positions of indoor units To know the indoor unit addresses though position of the indoor unit is recognized When the unit is individual (the indoor unit is paired with a wired remote controller one-to-one), or it is a group-controlled one.
  • Page 45 To find an indoor unit’s position from its address When checking unit numbers controlled as a group <RBC-AMT > TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT Stop FILTER RESET TEST SWING/FIX UNIT LOUVER (Execute it while the units are stopped.) The indoor unit numbers in a group are indicated one after another.
  • Page 46 <RBC-AMS5*E-UL> Field setting menu(2/2) The position of indoor unit body by address Setting timer operation mode Setting timer operation mode DN setting DN setting Push the [ MENU] button to display Reset power consumption data the menu screen. Push and hold the [ MENU] button Return and the [...
  • Page 47 To check all the indoor unit addresses using an arbitrary wired remote controller. (When communication wirings of 2 or more refrigerant lines are interconnected for central control) <RBC-AMT > TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT FILTER RESET TEST SWING/FIX...
  • Page 48 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.) <RBC-AMT >...
  • Page 49 <RBC-AMS5*E-UL> Push the [ MENU] button to display the menu screen. Push and hold the [ MENU] button and the [ ] button at the same time to display the “Field setting menu”. → Push and hold the buttons for more than 4 seconds. Push the [ ] / [ ] button to select “7.
  • Page 50 To change all the indoor unit addresses using an arbitrary wired remote controller. (The method is available when the addresses have already been set automatically.) (When communication wirings of 2 or more refrigerant lines are interconnected for central control) NOTE You can change the addresses of indoor units in each refrigerant line using an arbitrary wired remote controller.
  • Page 51 Check code clearing function How to clear the check code using the wired remote controller <RBC-AMT > Clearing a check code of the outdoor unit Clear the currently detected outdoor unit for each refrigerant line to which the indoor unit controlled by the remote controller is connected.
  • Page 52 Monitoring function of wired remote controller <RBC-AMT > TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT FILTER RESET TEST SWING/FIX UNIT LOUVER Content Enter the service monitoring mode using the remote controller to check the sensor temperature or operation status of the remote controller, indoor unit, and outdoor unit.
  • Page 53 <RBC-AMS5*E-UL> The sensor temperature or operational status of indoor unit, outdoor unit, or remote controller can be monitored. Indoor unit data Code Data name Room temperature (remote controller) Monitor function Indoor unit intake air temperature (TA) Code Data Indoor unit heat exchanger (coil) 0024 temperature (TCJ) Indoor unit heat exchanger (coil)
  • Page 54 Indoor service monitor list 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 °F [0075]= 75 °F...

  • Page 55: Troubleshooting

    8. TROUBLESHOOTING 8-1. Overview (1) Before engaging in troubleshooting (a) Applicable models All Super Modular Multi System (SMMS- ) models. (Indoor units: MM -UP , Outdoor units: MMY-M P (b) Tools and measuring devices required • Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc. •...

  • Page 56: Troubleshooting Method

    8-2. Troubleshooting method The remote controllers (main remote controller and central control device) and the interface P.C. board of an outdoor unit are provided with an a 7-segment display (outdoor interface P.C. board) to display operational status. Using this self-diagnosis feature, the trouble site / trouble part may be identified in the event of a trouble by following the method described below.
  • Page 57 (Check code detected by remote controller) Check code Display of receiving unit Outdoor 7-segment display Indicator light block Typical trouble site Description of trouble Remote control Operation Timer Ready Sub-code Flash No master remote control, Signals cannot be received from indoor unit; –...
  • Page 58 List of Check Codes (Outdoor Unit) (Check code detected by outdoor interface - typical examples) If "HELLO" is displayed on the oudoor 7-segment for 1 minute or more, turn off the power supply once and then turn on the power supply again after passage of 30 seconds or more. When the same symptom appears, it is considered there is a possibility of I/F board trouble.
  • Page 59 Check code Display of receiving unit Outdoor 7-segment display Central Indicator light block control or main Typical problem site Description of problem remote Operation Timer Ready Sub-code Flash controller display Outdoor suction 01: TS1 sensor Outdoor suction temperature sensor temperature sensor 03: TS3 sensor (TS1,TS3) has been open/short-circuited.
  • Page 60 Check code Display of receiving unit Outdoor 7-segment display Central Indicator light block Typical problem site Description of problem control or main remote Operation Timer Ready Sub-code Flash controller display P.C.board P.C.board Compressor Fan Motor Compressor Fan Motor Trouble in number of There are insufficient number of P.C.
  • Page 61 (Check code detected by Inverter of Compressor featuring in outdoor unit - typical examples) Check code Display of receiving unit Outdoor 7-segment display Central Indicator light block Typical problem site Description of proplem control or main remote Operation Timer Ready Sub-code controller Flash...

  • Page 62: Troubleshooting Based On Information Displayed On Remote Controller

    8-3. Troubleshooting based on information displayed on remote controller <RBC-AMT > (1) Checking and testing When a trouble occurs to an air conditioner, a check code and indoor unit No. are displayed on the display window of the remote controller. Check codes are only displayed while the air conditioner is in operation.
  • Page 63 <RBC-AMS5*E-UL> Check code When a trouble has occurred in the air conditioner, the Code : P10 Unit : 2–2 check code and the unit number of the indoor unit appear Unit number of the on the display of the remote controller. malfunctioning indoor unit * The check code appears only while the unit is running.
  • Page 64 Using indoor unit indicators (receiving unit light block) (wireless type) To identify the check code, check the 7-segment display on the header unit. To check for check codes not displayed on the 7-segment display, consult the “List of Check Codes (Indoor Unit)” in “8-2. Troubleshooting method”. : Blinking (0.5 seconds) : Lighting : Goes off...
  • Page 65 Cause of trouble Light block Check code Heat exchanger temperature sensor (TCJ) trouble Operation Timer Ready Heat exchanger temperature sensor (TC2) trouble Indoor unit temperature Heat exchanger temperature sensor (TC1) trouble sensor trouble Ambient temperature sensor (TA) trouble Alternate blinking Discharge temperature sensor (TF) trouble Discharge temperature sensor (TD1) trouble Discharge Operation Timer...
  • Page 66 Cause of trouble Light block Check code Operation Timer Ready Occupancy sensor trouble Outdoor EEPROM trouble Synchronized blinking Other (indications not involving check code) Cause of trouble Light block Check code Operation Timer Ready – Test run in progress Synchronized blinking Operation Timer Ready Setting incompatibility...

  • Page 67: Check Codes Displayed On Remote Controller And Smms Series Outdoor Unit (7-Segment Display On I/F Board) And Locations To Be Checked

    8-4. Check Codes Displayed on Remote Controller and SMMS series 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 Check code detection Main Outdoor 7-segment display Description...
  • Page 68 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code No. of indoor Indoor unit Indoor-outdoor All stop Condition 1 • Check power supply to units from communication One indoor unit or more indoor unit.
  • Page 69 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Too many All stop • Combined capacity of • Check capacities of indoor Capacity over indoor units indoor units is too large.
  • Page 70 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Detected Outdoor All stop Outdoor header unit • Check check code outdoor unit No. follower unit receives trouble code from displayed on outdoor trouble outdoor follower unit.
  • Page 71 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code TD2 sensor All stop Sensor resistance is infinity • Check connection of TD2 trouble or zero (open/short circuit). sensor connector.
  • Page 72 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Outdoor All stop Readings of high-pressure • Check connection of high- pressure Pd sensor and low-pressure pressure Pd sensor sensor wiring Ps sensor are switched.
  • Page 73 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code TD1 sensor All stop Discharge temperature of • Check installation of TD1 miswiring compressor 1 (TD1) does sensor.
  • Page 74 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code 01: TK1 oil Oil level All stop No temperature change is • Check for disconnection of circuit trouble detection detected by TK1 despite TK1 sensor.
  • Page 75 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Outdoor All stop Initial setting of I/F P.C. • Check model setting of — capacity not set board has not been P.C.
  • Page 76 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code 1∗: Compressor Activation of All stop High-pressure SW is • Check connection of high- 1 side high-pressure activated.
  • Page 77 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Detected indoor Indoor unit Indoor overflow All stop • Float switch operates. • Check float switch address trouble •...
  • Page 78 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Discharge All stop Discharge temperature • Check outdoor service temperature (TD2) exceeds 115 ˚C. valves (gas side, liquid TD2 trouble side) to confirm full opening.
  • Page 79 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code 1∗: Fan P.C. Fan INV. Outdoor fan All stop Protected operation of Fan • Check fan motor. board 1 P.C.
  • Page 80 Check codes Detected by Central Control Device Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Central Central control Continued Central control device is • Check for failure in central control device operation...
  • Page 81 Points to Note When Servicing Compressor (1) When checking the outputs of inverters, remove the wiring from all the compressors. How to Check Inverter Output (1) Turn off the power supply. (2) Remove compressor leads from the compressor P.C. board. (The model with two compressor should remove the wiring for two sets (6 leads).

  • Page 82: Diagnostic Procedure For Each Check Code (Indoor Unit)

    8-5. Diagnostic Procedure for Each Check Code (Indoor Unit) - 82 -...
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  • Page 90: Sensor Characteristics

    8-6. Sensor Characteristics Indoor Unit Temperature sensor characteristics Indoor TA sensor Temperature [˚F(˚C)] Resistance [kΩ] 32˚F(0˚C) 33.9 Resistance 41˚F(5˚C) 26.1 [kΩ] 50˚F(10˚C) 20.3 59˚F(15˚C) 15.9 68˚F(20˚C) 12.6 77˚F(25˚C) 10.0 86˚F(30˚C) 95˚F(35˚C) 104˚F(40˚C) 113˚F(45˚C) 122˚F(50˚C) 131˚F(55˚C) 140˚F(60˚C) 32˚F 50˚F 68˚F 86˚F 104˚F 122˚F 140˚F...

  • Page 91: Maintenance List

    8-7. Maintenance 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 92: Board Exchange Procedures

    9. P.C. BOARD EXCHANGE PROCEDURES Indoor unit Replacement of indoor P.C. boards <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 93 <RBC-AMT > [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. Step 1 Push button on the remote controller simultaneously for more than 4 seconds. * When the group operation control is performed, the unit No.
  • Page 94 [2] P.C. Board for indoor unit servicing replacement procedures (e.g. MCC-1643) Step1 Replace the P.C. board to the P.C. board for indoor unit servicing. At this time, perform the same setting of the jumper wire (J01, J08, J09) setting (cut), switch SW501, (short-circuit) connector CN34 as the setting of the P.C.
  • Page 95 [3] Writing the setting data to EEPROM The settings stored in the EEPROM of the P.C. board for indoor unit servicing are the factory-set values. <RBC-AMT > Step 1 Push buttons on the remote controller simultaneously for more than 4 seconds. * In the group control operation, the unit No.
  • Page 96 Table 1. Setting data (CODE No. table (example)) CODE No. (DN) Item Setting data Factory-set value Filter sign lighting time Depending on Type Filter pollution level 0000: standard Central control address 0099: Not determined Heating suction temperature shift Depending on Type Cooling only 0000: Heat pump Type...

  • Page 97: Detachments

    10. DETACHMENTS Part name Procedure Remarks Grille air inlet CAUTION Be sure to put on the gloves and long-sleeved shirt at disassembling work; otherwise an injury will be caused by a part, etc. 1. Detachment (Fig. 1) 1) Stop operation of the air conditioner and then turn off switch of the breaker.
  • Page 98 Part name Procedure Remarks Control P.C.board 1. Detachment 1) Carry out work of item 1 of ① and item 1 of ②. 2) Remove connectors which are connected from the control P.C. board to the other parts and then remove wiring from the clamp. CN510 : Louver motor (20P, White) CN34 : Float switch (3P, Red)
  • Page 99 Part name Procedure Remarks Ceiling panel 1. Detachment (Fig. 6) 1) Carry out work of item 1 of ② and item 1 of ④. Terminal cover 2) Remove the flap connector (CN510, White, 20P) Electrical control Screw box cover connected to the control P.C. board and then CN510 Clamper Screw...
  • Page 100 Part name Procedure Remarks Drain pan 1. Detachment (Fig. 12) 1) Carry out work of item 1 of ⑤. 2) Remove the cap drain and then drain the Drain pan water accumulated in the drain pan. (Fig. 12) * When taking off the cap drain, be sure to prepare a bucket, etc.
  • Page 101 Part name Procedure Remarks Float switch 1. Detachment (Fig. 17) Nut fixing float switch 1) Carry out work of item 1 of 2) Remove the float switch connector (CN34, Red, 3P) connected to the control P.C. board and then remove the lead wire from the clamp.
  • Page 102 Part name Procedure Remarks Fan motor and 1. Detachment (Fig. 21) 1) Carry out work of item 1 of ⑥ and item 1 of Heat exchanger cross flow fan ⑩. 2) Remove the fan motor connector (CN210, White, 7P) connected to the control P.C. board and then remove the lead wire from the clamp.
  • Page 103 Part name Procedure Remarks Bearing 1. Detachment (Fig. 27) Carry out work of item 1 of ⑪. Push the bearing to inside hole of base bearing follow direction of arrow (Fig. 27) Pull the bearing follow direction of arrow Bearing (Fig.

  • Page 104: Exploded Views And Parts List

    11. EXPLODED VIEWS AND PARTS LIST Indoor Unit 1-way cassette type - 104 -...
  • Page 105 Model name Location MMU-AP Part No. Description 0071YHPUL 0091YHPUL 0121YHPUL 43T70327 DRAIN HOSE ASSY 43T22312 BEARING ASSY, MOLD 43T21515 MOTOR-FAN 43T39428 MOTOR BAND DOWN 43T39429 MOTOR BAND UP 43T20362 CROSS FLOW FAN ASSY 43T44718 REFRIGERATION CYCLE ASSY 43T46516 BODY, PMV 43T46515 COIL, PMV 43T19321...
  • Page 106 Electric Parts Model name Location MMU-AP Part No. Description 0071YHPUL 0091YHPUL 0121YHPUL 43T6W910 PC BOARD ASSY (MCC-1643) 43T60362 TERMINAL 43T60078 TERMIMAL BLOCK 43T50389 TA-SENSOR 43T50477 TC-SENSOR (TC1) 43T50387 TC-SENSOR (TC2) 43T50386 TCJ SENSOR (RED) 43T50351 HOLDER-TA 43T6W911 PC BOARD ASSY (WP-502) 43T6W912 PC BOARD ASSY (WP-503) 43T50408...
  • Page 107 RBC-UY32P-UL Location Part No. Description RBC-UY32P-UL 43T22378 HORIZONTAL LOUVER ASSY 43T01334 PANEL COVER ASSY 43T01335 PANEL COVER ASSY 43T09593 GRILLE ASSY 43T19381 GRILLE HOOK RIGHT 43T19382 GRILLE HOOK LEFT 43T80364 AIR FILTER 43T07327 PANEL FIXED PLATE 43T07328 LOUVER MOTOR COVER 43T21478 MOTOR;...
  • Page 108 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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