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Toshiba MMU-UP0051MHP-E Service Manual
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Toshiba MMU-UP0051MHP-E Service Manual

Toshiba MMU-UP0051MHP-E Service Manual

Air conditioner (multi type)
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AIR CONDITIONER (MULTI TYPE)
SERVICE MANUAL
Indoor unit
<Compact 4-way cassette type>
MMU-UP0051MHP-E(TR)
MMU-UP0071MHP-E(TR)
MMU-UP0091MHP-E(TR)
MMU-UP0121MHP-E(TR)
MMU-UP0151MHP-E(TR)
MMU-UP0181MHP-E(TR)
FILE NO. SVM-23084-1
Revised on Jan, 2024

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Summary of Contents for Toshiba MMU-UP0051MHP-E

  • Page 1 FILE NO. SVM-23084-1 AIR CONDITIONER (MULTI TYPE) SERVICE MANUAL Indoor unit <Compact 4-way cassette type> MMU-UP0051MHP-E(TR) MMU-UP0071MHP-E(TR) MMU-UP0091MHP-E(TR) MMU-UP0121MHP-E(TR) MMU-UP0151MHP-E(TR) MMU-UP0181MHP-E(TR) Revised on Jan, 2024...
  • Page 2 CONTENTS PRECAUTIONS FOR SAFETY..................6 1. SPECIFICATIONS....................18 2. CONSTRUCTION VIEWS (EXTERNAL VIEWS) ............ 20 3. WIRING DIAGRAMS....................21 4. PARTS RATING ...................... 22 5. REFRIGERANT CYCLE DIAGRAM ............... 23 6. CONTROL OUTLINE ....................24 7. COMMUNICATION TYPE, MODEL NAMES AND THE MAXIMUM NUMBER OF CONNECTABLE UNITS ..................
  • 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...
  • 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 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.
  • Page 11 Precautions for using R32 refrigerant The basic installation work procedures are the same as conventional refrigerant (R410A, R22) models. However, Please read through this manual after understanding the contents below; These safety cautions describe important matters concerning safety to prevent injury to users or other people and damages to property.
  • Page 12 • The servicing shall be performed only as recommended by the manufacturer. • Where the appliance using flammable refrigerants is installed, Be aware that; - The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation.
  • Page 13 6.No ignition sources • No person carrying out work in relation to a refrigeration system which involves exposing any pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. •...
  • Page 14 12.Cabling • Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. • Check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans. 13.Detection of flammable refrigerants •...
  • Page 15 17.Decommissioning • Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details. • It is recommended good practice that all refrigerants are recovered safely. • Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required to reuse of reclaimed refrigerant.
  • Page 16 Declaration of Conformity Manufacturer: Toshiba Carrier (Thailand) Co.,Ltd. 144 / 9 Moo 5, Bangkadi Industrial Park, Tivanon Road, Tambol Bangkadi, Amphur Muang, Pathumthani 12000, Thailand TCF holder: TOSHIBA CARRIER UK LTD. Porsham Close Belliver Industrial Estate Roborough Plymouth Devon PL6 7DB United Kingdom...
  • Page 17 Declaration of Conformity Manufacturer: Toshiba Carrier (Thailand) Co.,Ltd. 144 / 9 Moo 5, Bangkadi Industrial Park, Tivanon Road, Tambol Bangkadi, Amphur Muang, Pathumthani 12000, Thailand TCF holder: TOSHIBA CARRIER EUROPE S.A.S Route de Thil 01120 Montluel FRANCE Hereby declares that the machinery described below:...
  • Page 18 1. SPECIFICATIONS Indoor unit : Compact 4-way cassette type R32 or R410A Model name MMU-UP0051MHP-E(TR) MMU-UP0071MHP-E(TR) MMU-UP0091MHP-E(TR) MMU-UP0121MHP-E(TR) Cooling Capacity (*1) (kW) Heating Capacity (*1) (kW) Power supply 1 Ph., 220-240V, 50 Hz / 208-230V, 60 Hz Running current 0.20/0.19 0.21/0.20...
  • Page 19 Model name MMU-UP0151MHP-E(TR) MMU-UP0181MHP-E(TR) Cooling Capacity (*1) (kW) Heating Capacity (*1) (kW) Power supply 1 Ph., 220-240V, 50 Hz / 208-230V, 60 Hz Running current 0.27/0.27 0.40/0.39 Electrical characteristics Power consumption (kW) 0.024/0.024 0.040/0.040 Starting current 0.33/0.33 0.49/0.47 Main unit Zinc hot dipping steel plate * Heat-insulating material attached to only upper plate RBC-UM21P-E / RBC-UM21PB-E Appearance...
  • Page 20 2. CONSTRUCTION VIEWS (EXTERNAL VIEWS) Compact 4-way cassette type - 20 -...
  • Page 21 3. WIRING DIAGRAMS Compact 4-way cassette type - 21 -...
  • Page 22 4. PARTS RATING Indoor unit Compact 4-way cassette type Model MMU-UP***MHP-E(TR) LDF-340-60AA1 Fan motor PMD-08D12TF-2 Drain pump motor FS-1A-31-3 Float switch PAM-B25YGTF-2 PAM-B40YGTF-1 Pulse motor valve MCC-1643 P.C.board Lead wire length: 818 mm Vinyl tube TA sensor Dia.4 size lead wire length: 500 mm Vinyl tube TC1 sensor Dia.6 size lead wire length: 550 mm Vinyl tube (Black) TC2 sensor...
  • Page 23 5. REFRIGERANT CYCLE DIAGRAM Indoor unit Liquid side Gas side Cooling Heating Strainer Capillary tube Heat exchanger at indoor side Pulse Motor Valve (PMV) Strainer 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 24 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 25 Item Outline of specifications Remarks 2) By setting the CODE No. 06, the setup temperature in Return air temperature Room temp. control heating operation can be compensated. shift of heating operation (Continued) Setup data Setup temp. compensation +0°C +2°C +4°C +6°C Except while sensor of the remote controller is...
  • Page 26 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 Depends on fan speed mode speed varies by the difference between TA and Ts.
  • Page 27 Item Outline of specifications Remarks Fan speed selection Setting of height ceiling mode at CODE No. [5D] or (Continued): at SW501 on P .C. board. Compact 4-way (only UP015, 018) (Fan speed selection of UP012 or less for Compact 4-way are only Standard.) Factory default Type 1 Type 3...
  • Page 28 Item Outline of specifications Remarks Prevention of cold 1. In heating operation, the lowest temperature between TCJ: Temperature of indoor TC1 sensor and the highest temperature between air discharge heat exchanger sensor TC2 and TCJ sensor is set as the upper bound of the •...
  • Page 29 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 30 Item Outline of specifications Remarks Alarm output The alarm output from the indoor P .C. board is output in each Connector CN61 setup indoor unit during group control, but it can be set so as to be (Optional connector output in the header unit and follower units. specifications of indoor Following the table below, register the setting data in DN Code "79".
  • Page 31 Item Outline of specifications Remarks Selection of 1) Selection of the contents that can be operated by the central control remote controller at the indoor unit side is possible mode according to setting at the central controller side. 2) Setting contents Operation on remote controller Operation from ON/OFF...
  • Page 32 Item Outline of specifications Remarks Louver control <<Individual air direction setup>> Subject model : (Continued) UNIT LOUVER Compact 4-way • Pushing Louver select button enables every discharge port to set up the air direction. (In the case of RBC-AMTU3∗) The louver numbers that are displayed on the display part Setup from the remote correspond to those in the following figure.
  • Page 33 Item Outline of specifications Remarks Louver control <<Selection of Swing mode>> Subject model : Compact 4-way (Continued) • For the Swing mode, the following three types of modes are selectable and settable by keeping Swing/Direction SWING/FIX button pushed for 4 seconds or more on the remote controller.
  • Page 34 Item Outline of specifications Remarks Louver control • If there is the locked louver in the unit, [ ] goes on the For the setting operation, refer to [How to set louver remote controller screen. (Continued) lock] of Installation Manual. •...
  • Page 35 Item Outline of specifications Remarks Occupancy 1) During the Occupancy sensor operation (DN code: [B5] The Occupancy sensor sensor [0001] and [B6] [0002 to 0005]), when there is no people in can be set up by wired the Occupancy sensor range, it is automatically switched to remote controller the operation for the absence.
  • Page 36 Item Outline of specifications Remarks Secondary Secondary heating can be used while heating operations are performed. heating <Control Outline (Normal Mode)> 1) If the difference between the indoor temperature and the outdoor temperature is large while the air conditioner is operating, turn ON the secondary heating.
  • Page 37 Item Outline of specifications Remarks Secondary DN [C5] Data Secondary heating mode heating (Continued) 0000 Normal mode (Factory default) 0001 Flip mode DN [C6] Data : Set temp. out (high) [ºC] -0015 "-0015": -15ºC to "0015": 15ºC "0000": 0ºC (Factory default) 0015 DN [C7] Data...
  • Page 38 Item Outline of specifications Remarks R32 refrigerant • When connecting to an outdoor unit that uses R32 refrigerant, Indoor unit type usable the following settings must be made according to the safety Safety with R32 refrigerant: system used. Compact 4-way measures * Floor standing type (Including concealed type and cabinet type) setting...
  • Page 39 7. COMMUNICATION TYPE, MODEL NAMES AND THE MAXIMUM NUMBER OF CONNECTABLE UNITS 7-1. This air conditioning (U series) has new communication specifications, and TU2C- LINK (U series) and TCC-LINK (other than U series) differ in a communication type. For the communication type and the model names such as each unit or remote controllers, refer to the following table.
  • Page 40 8. APPLIED CONTROL AND FUNCTIONS (INCLUDING CIRCUIT CONFIGURATION) 8-1. Indoor controller block diagram (MCC-1643) 8-1-1. 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...
  • Page 41 8-1-2. 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 42 Indoor unit #1 (Header) (Follower) (Follower) Indoor control P.C. board (MCC-1643) DC20V Remote controller communication circuit EEPROM DC5V TA sensor DC12V Same Same TC1 sensor as left as left TC2 sensor Driver TCJ sensor Outside output Louver motor Start/Alarm Wireless kit Drain Application pump...
  • Page 43 8-1-3. Connection of both wired remote controller and wireless remote controller Wired header remote controller Schedule timer Function setup Display Display LCD driver Key switch EEPROM Function setup DC5V DC5V Power Display LED Key switch circuit Remote controller Power Secondary communication circuit circuit battery...
  • Page 44 8-2. Indoor Print Circuit Board MCC-1643 - 44 -...
  • Page 45 - 45 -...
  • Page 46 8-3. 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 47 <RBC-ASCU11-∗ ∗ ∗ ∗ ∗ > Be sure to stop the air conditioner before making settings. (Change the setup while the air conditioner is not working.) Push and hold OFF timer button and [ ] setting button simultaneously for 10 seconds or more.
  • Page 48 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 49 Check function for operation of indoor unit (Functions at indoor unit side) This function is provided to check the operation of the indoor unit individually without connecting to the remote controller or the outdoor unit. This function can be used regardless of the ON/OFF operation. However, it is recommend to avoid using this function for along time, otherwise the trouble of the equipment may occurred.
  • Page 50 8-4. 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-AMTU3∗ ∗ ∗ ∗ ∗ > Push the buttons simultaneously and hold for at least 4 seconds.
  • Page 51 Push OFF timer button to confirm the selected indoor unit. Code No. Set data ∗∗ ∗∗ ∗∗ ∗∗ ∗∗ ∗∗ ∗∗ ∗∗ ∗∗ ∗∗ Push the menu button to make Code No. [ ] flash. Change Code No. [ ] with [ ] setting button.
  • Page 52 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 53 Description Item At shipment ° : F ° ° : 0000: Standard (Factory default) 0000: Standard c i t 0001: High ceiling 1 (UP015, 018 only) High-ceiling adjustment 0003: High ceiling 3 (UP015, 018 only) (Air flow selection) Timer setting 0000: Available 0001: Unavailable 0000: Available...
  • Page 54 Item Description At shipment Notice code 0000: None 0000: None number 01 0001 ~ 0255 : Notice code 0129 : Notice code (201) Notice code 0000: None 0130 : Notice code (202) number 02 (0001 ~ 0255 : TU2C-LINK only) Notice code 0000: None number 03...
  • Page 55 Table 2. Table 1. Type: CODE No. 10 Indoor unit capacity: CODE No. 11 Setting data Type Type name abb. Setup data Model Compact 4-way Cassette Type MMU-UP***1MHP* 0014∗ 0000* Invalid CAUTION 0041 005 Type ∗ <Model name: MMU-UP***1MHP*> 0001 007 Type For this model, please make all the following settings.
  • Page 56 8-5. Applied control of indoor unit Control system using Remote location ON/OFF control box (TCB-IFCB-4E2) Wiring and setting • In the case of group control, the control system functions as long as it is connected to one of the indoor units (control P.C.
  • Page 57 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. •...
  • Page 58 Auto-off feature control [Function] • This function controls the indoor units individually. It is used when the start operation from outside is unnecessary but the stop operation is necessary. • A card switch box or card lock helps protect customers from forgetting to turn off the indoor unit. (not including the following Card Input 3) •...
  • Page 59 [Control items] External contact terminal Function Close (Status that card is inserted) Open (Status that card is taken out) Manual prohibition release Manual prohibition Card Input 1 (Manual operation) (Operation stop) Manual prohibition release Manual prohibition Card Input 2 (Automatic operation) (Operation stop) Operation status continues Operation status continues and setting temperature...
  • Page 60 [The example of Card Input 5 setting] Code No. (DN) setting External contact terminal Case. [16A] [16b] [16C] [16d] [16F] [170] [171] [172] [173] Close (Status that card is inserted) Open (Status that card is taken n out) data data data data data...
  • Page 61 Notice code signal Notice code is a function dedicated to TU2C-LINK communication. See service manual for u series outdoor unit for details of Notice code. [Function] • Notice Code is issued if there is signal input to connector of outdoor unit P.C. board. This can be used in cases such as when confirming state of outdoor unit (filter clogging, etc.) by air conditioner system.
  • Page 62 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 63 <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 64 <Indoor unit address> Push the [menu] button until the CODE No. flashes. And using the [ ] buttons, specify the CODE No.13. Push the [menu] button until the SET DATA flashes. And using the [ ] buttons, set an indoor unit address. Push the [OFF timer] button to confirm the SET DATA.
  • Page 65 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 66 To find an indoor unit’s position from its address When checking unit numbers controlled as a group ∗ ∗ ∗ ∗ ∗ <RBC-AMTU3 > 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 67 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-AMTU3 > TEMP. ON / OFF TIMER SET MODE TIME SAVE...
  • Page 68 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.) ∗...
  • Page 69 ∗ ∗ ∗ ∗ ∗ <RBC-ASCU11- > 3, 4 2, 5 3, 4 3, 4 Push and hold the [menu + ] buttons at same time for more than 10 seconds. Push the [OFF timer] button to confirm the selected indoor unit. Push the [menu] button until the CODE No.
  • Page 70 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 71 Check code clearing function How to clear the check code using the wired remote controller ∗ ∗ ∗ ∗ ∗ <RBC-AMTU3 > 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 72 ∗ ∗ ∗ ∗ ∗ <RBC-ASCU11- > 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. (The indoor unit check code is not cleared.) Use the service monitoring function of the remote controller.
  • Page 73 Monitoring function of wired remote controller ∗ ∗ ∗ ∗ ∗ <RBC-AMTU3 > 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 74 Indoor service monitor list Code No. Data name Display format Unit Remote controller display example Room temperature (Use to control) ×1 °C Room temperature (Remote controller) ×1 °C Indoor suction air temperature (TA) ×1 °C Indoor coil temperature (TCJ) ×1 °C Indoor coil temperature (TC2) ×1...
  • Page 75 9. TROUBLESHOOTING 9-1. Overview (1) Before engaging in troubleshooting (a) Applicable models All Super Modular Multi System (SMMS- , SHRM- ) models. ∗ ∗ (b) Tools and measuring devices required • Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc. •...
  • Page 76 9-2. 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 77 (Check code detected by remote controller) Check code Display of receiving unit Outdoor 7-segment display Indicator light block Typical trouble site Description of check code Remote control Operation Timer Ready Sub-code Flash No master remote control, Signals cannot be received from indoor unit; –...
  • Page 78 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 79 Check code Display of receiving unit Outdoor 7-segment display Central Indicator light block control or main Typical problem site Description of check code remote Operation Timer Ready Sub-code Flash controller display 01: TL1 sensor Outdoor liquid temperature Outdoor liquid temperature sensor (TL1,TL2,TL3) 02: TL2 sensor sensor (TL1,TL2,TL3) has been open/short-circuited.
  • Page 80 Check code Display of receiving unit Outdoor 7-segment display Central Indicator light block control or Typical problem site Description of check code main remote Operation Timer Ready Sub-code Flash controller display 01 : Flow Selector (FS) unit (s) Flow Selector (FS) unit(s) FS unit(s) outside the application setting installation trouble"...
  • Page 81 Check code Display of receiving unit Outdoor 7-segment display Central Indicator light block Typical problem site Description of check code control or main remote Operation Timer Ready Sub-code controller Flash display Outdoor heat exchanger Remaining frost on outdoor heat exchanger –...
  • Page 82 9-3. Troubleshooting based on information displayed on remote controller ∗ ∗ ∗ ∗ ∗ <RBC-AMTU3 > (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 83 ∗ ∗ ∗ ∗ ∗ <RBC-ASCU11- > (1) Confirmation and check If a problem occurs with the air conditioner, the OFF timer indicator alternately shows the check code and the indoor Unit No. in which the problem occurred. Check code The indoor Unit No.
  • Page 84 Using indoor unit indicators (receiving unit light block) (wireless type) To identify the check code, check the 7-segment display on the outdoor unit. To check for check codes not displayed on the 7-segment display, consult the “List of Check Codes (Indoor Unit)” in “9-2. Troubleshooting method”. : Blinking (0.5 seconds) : Lighting : Goes off...
  • Page 85 Light block Check code Cause of trouble Outdoor discharge (TD1) temperature trouble Operation Timer Ready Activation of outdoor high-pressure SW Open phase / power failure Inverter DC voltage (Vdc) trouble MG-CTT trouble Alternate blinking Outdoor heat sink overheating trouble - Poor cooling of electrical component (IGBT) of outdoor unit Gas leak detection - insufficient refrigerant charging Injection circuit trouble.
  • Page 86 Light block Check code Cause of trouble Compressor breakdown Operation Timer Ready Outdoor unit compressor Compressor lockup related trouble Current detection circuit trouble Blinking Wiring / installation trouble or detachment of outdoor discharge temperature sensor (TD1) Abnormal drop in low-pressure sensor (Ps) reading Protective shutdown of outdoor unit Abnormal drop in oil level...
  • Page 87 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 88 9-4. Check Codes (Displayed on remote controller and 7-segment display of outdoor Unit) The contents of these check code tables differ depending on the outdoor unit to be connected. Refer to the service manual of the connected outdoor unit. (The table below is for the SMMS-u series.) Check code Location Check code detection...
  • Page 89 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 • Check power supply to Indoor-outdoor All stop Condition 1 units from communication One indoor unit or more indoor unit.
  • Page 90 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 91 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 check outdoor unit No. follower unit receives trouble code from displayed on outdoor code...
  • Page 92 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 93 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 94 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 95 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 96 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 97 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: Compressor Activation of All stop High-pressure SW is • Check connection of high- 1 side high-pressure activated.
  • Page 98 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 99 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 100 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. P.C.
  • Page 101 Check codes Displayed on 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 Indoor unit Indoor-remote Stop of There is no communication • Check remote controller controller corresponding from remote controller...
  • Page 102 9-5. Diagnostic Procedure for Each Check Code (Indoor Unit) - 102 -...
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  • Page 111 9-6. Sensor characteristics 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...
  • Page 112 Winding resistance of PMV (Pulse Motor Vale) coil Measure position Resistance value White - Red (COM) Yellow - Red (COM) 180 to 220 Ω Orange - Red (COM) Blue - Red (COM) at 20ºC 9-7. 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.
  • Page 113 9-8. Notice code • Notice code is a function only in TC2U-LINK communication. • When the outdoor or indoor unit detects its conditions requiring caution or maintenance, this function notices you to check your units with the spanner mark (Notice code mark) on the wired remote controller or central controller display.
  • Page 114 10. P.C. BOARD EXCHANGE PROCEDURES Indoor unit Replacement of indoor P.C. boards CAUTION For this model, please make all the following settings. CODE No.(DN) Setting data Description 0004 Global model 0001 Auto-restart <Note: when replacing the P.C. board for indoor unit servicing> The nonvolatile memory (hereafter called EEPROM, IC503) on the indoor unit P.C.
  • Page 115 [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. ∗ ∗ ∗ ∗ ∗ <RBC-ASCU11- > (header unit No. when the group operation control) Step2 Step3 Step1...
  • Page 116 CODE No. required at least 1. The Code No. for the Indoor unit type and Indoor unit capacity are Contents required to set the rotation number setting of the fan. Type 2. If the system/indoor/group addresses are different from those Indoor unit capacity before replacement, the auto-address setting mode starts and the System address...
  • Page 117 [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 118 [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-ASCU11- > Step 1 Push and hold the [menu + ] buttons at same time for more than 10 seconds.
  • Page 119 ∗ ∗ ∗ ∗ ∗ <RBC-AMTU3 > Step 1 Push buttons on the remote controller simultaneously for more than 4 seconds. * In the group control operation, the unit No. displayed for the first time is the header unit No.. At this time, the CODE No.
  • Page 120 11. DETACHMENTS Compact 4-way cassette CAUTION WARNING Be sure to stop operation of the air conditioner before Be sure to put on gloves during working time; work and then turn off switch of the breaker. otherwise an injury will be caused by a part etc. No.
  • Page 121 No. Part name Procedure Remarks 1. Detachment Adjust corner cap 1) Remove the air intake grille. (Refer to 1 of 2) Loosen the fixing screws on the adjust corner cap. (M 4 × 10, 4 pcs.) Adjust corner 3) Slide the adjust corner cap to outside to remove it. Screw 2.
  • Page 122 No. Part name Procedure Remarks 1. Detachment Control P.C. board Clamp 1) Remove the electric parts cover. (Refer to 1 of 2) Remove connectors which are connected from the control P.C. board to the other parts and then remove wiring from the clamp. NOTE Unlock the lock of the housing part and then remove the connector.
  • Page 123 No. Part name Procedure Remarks Turbo fan 1. Detachment 1) Remove the air intake grille. (Refer to 1 of Fixing screw of bell mouth Reinforcement 2) Remove the fix screws (4 positions) of the bell mouth, washer assy and then take off it. (M 4 × 8, 4 pcs) 3) Loosen the flange nut (M8) at the center part of the turbo fan, and then take off (Counter clockwise) * Supporting with hands, take off the turbo fan so that...
  • Page 124 No. Part name Procedure Remarks 1. Detachment Drain pan 1) Remove the ceiling panel and the electrical parts covers. Fixing screws (Refer to items -1 and -1.) 2) Remove the wiring cover. (Fixing screw M 4 × 8, 3pcs.) 3) Remove the wiring fixing plate. Wiring cover (Fixing screw M 4 ×...
  • Page 125 No. Part name Procedure Remarks 1. Detachment Drain pump 1) Remove the drain pan. (Refer to -1.) 2) Remove the drain pump connector (CN504: 2P, White) connected to the control P.C. board and remove the lead wires from the clamp. 3) Remove the fixing screws to remove the drain pump.
  • Page 126 No. Part name Procedure Remarks 1. Detachment Fan motor 1) Remove the turbo fan, electric parts cover, wiring cover and wiring fixing plate. Motor lead (Refer to -1-2, -1-3.) wire cover 2) Remove the fan motor connector (CN210, White, 7P) connected to the control P.C.
  • Page 127 No. Part name Procedure Remarks 1. Detachment 1) Remove the drain pan. (Refer to -1.) 2) Pull out the sensor to be exchanged from the sensor Sensor holder. 3) Remove the connector connected to the control P.C. board, and take off wires from the clamp. (Refer to 2.
  • Page 128 No. Part name Procedure Remarks 1. Detachment Heat exchanger 1) Recover refrigerant gas. 2) Remove the refrigerant pipe at indoor unit side. 3) Remove the drain pan. (Refer -1.) 4) Disconnect the heat exchanger sensor (TC1, TC2, TCJ), PMV lead wires connectors from the control P.C. board, and then remove their lead wires from the clamp.
  • Page 129 12. EXPLODED VIEWS AND PARTS LIST Compact 4-way cassette type 205 204 - 129 -...
  • Page 130 Model name Location MMU-UP Part No. Description 0051MHP-E 0071MHP-E 0091MHP-E 0121MHP-E 0151MHP-E 0181MHP-E 43T22414 BELLMOUTH 43T72411 DRAIN PAN ASSY 43T70330 DRAIN HOSE ASSY 43T44835 REFRIGERATION CYCLE ASSY 43T44836 REFRIGERATION CYCLE ASSY 43T04509 PIPE COVER ASSY 43T97001 43T22415 REINFORCEMENT WASHER ASSY 43T20371 TURBO FAN ASSY 43T21544...
  • Page 131 Electric Parts Connector:Black 407 P.C. BOARD ASSY Connector:Red Connector:Yellow Connector:Brown Model name Location MMU-UP Part No. Description 0051MHP-E 0071MHP-E 0091MHP-E 0121MHP-E 0151MHP-E 0181MHP-E 43T60605 TEMPERATURE SENSOR 43T50456 SENSOR,TC 43T50410 TC-SENSOR 43T60362 TERMINAL 43T60078 TERMIMAL BLOCK 43TNV349 PC BOARD ASSY, MCC-1643 43459017 ASM-PCB(OP) 43T50455...
  • Page 132 Ceiling panel RBC-UM21P-E, RBC-UM21PB-E - 132 -...
  • Page 133 Model name Location Part No. Description RBC-UM21P-E RBC-UM21PB-E 43T09659 AIR INLET GRILLE 43T09660 AIR INLET GRILLE 43T80373 AIR FILTER 43T21434 STEPPING-MOTOR 43T11352 AIR OUTLET FOAM A 43T11353 AIR OUTLET FOAM B 43T22416 HORIZONTAL LOUVER ASSY 43T22417 HORIZONTAL LOUVER ASSY 43T01361 PANEL COVER ASSY 43T01363 PANEL COVER ASSY...
  • Page 134 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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