Carrier TOSHIBA MMU-UB0071HP-UL Service Manual
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Carrier TOSHIBA MMU-UB0071HP-UL Service Manual

Carrier TOSHIBA MMU-UB0071HP-UL Service Manual

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FILE NO. SVM-24099
SERVICE MANUAL
AIR-CONDITIONER
MULTI TYPE
INDOOR UNIT
< 4-way cassette type >
MMU-UB0071HP-UL
MMU-UB0091HP-UL
MMU-UB0121HP-UL
MMU-UB0151HP-UL
MMU-UB0181HP-UL
MMU-UB0241HP-UL
MMU-UB0301HP-UL
MMU-UB0361HP-UL
MMU-UB0421HP-UL
MMU-UB0481HP-UL
MMU-UB0541HP-UL
R454B
February, 2025

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Summary of Contents for Carrier TOSHIBA MMU-UB0071HP-UL

  • Page 1 FILE NO. SVM-24099 SERVICE MANUAL AIR-CONDITIONER MULTI TYPE INDOOR UNIT < 4-way cassette type > MMU-UB0071HP-UL MMU-UB0091HP-UL MMU-UB0121HP-UL MMU-UB0151HP-UL MMU-UB0181HP-UL MMU-UB0241HP-UL MMU-UB0301HP-UL MMU-UB0361HP-UL MMU-UB0421HP-UL MMU-UB0481HP-UL MMU-UB0541HP-UL R454B February, 2025...

  • Page 2: Table Of Contents

    Original instruction Adoption of new Refrigerant This Air Conditioner uses R454B an environmentally friendly refrigerant. CONTENTS PRECAUTIONS FOR SAFETY ..................1. SPECIFICATIONS ....................... DIMENSIONAL DRAWING ..................WIRING DIAGRAMS ....................PARTS RATING ......................REFRIGERANT CYCLE DIAGRAM ................CONTROL OUTLINE ....................COMMUNICATION TYPE, MODEL NAMES AND THE MAXIMUM NUMBER OF CONNECTABLE UNITS ...........

  • Page 3: Safety Caution

    SAFETY CAUTION Please read carefully through these instructions that contain important information and ensure that you understand them. Generic Denomination: Air Conditioner Definition of Qualified Installer or Qualified Service Person The air conditioner must be installed, maintained, repaired and removed by a qualified installer or qualified service person.
  • 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 This mark is for R454B refrigerant only. Refrigerant type is written on nameplate of outdoor unit. WARNING In case that refrigerant type is R454B, this unit uses a flammable refrigerant. (Risk of fire) If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.

  • 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 WARNING 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 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: Cautions On Installation/Service

    • Refrigerant R454B This air conditioner adopts a type refrigerant R454B which does not deplete the ozone layer. 1. Safety Caution Concerned to R454B Refrigerant Accompanied with change of refrigerant, the refrigerating oil has been also changed. Therefore, be sure that water, dust, the former refrigerant or the former refrigerating oil is not mixed into the refrigerating cycle of the air conditioner with new refrigerant during installation work or service work.
  • Page 12 4. Tools 1. Required Tools for R454B 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 R454B (Those which cannot be used for conventional refrigerant (R22)) 2) Tools exclusive for R454B, but can be also used for conventional refrigerant (R22) 3) Tools commonly used for R454B and for conventional refrigerant (R22) The table below shows the tools exclusive for R454B and their interchangeability.

  • Page 13: Specifications

    1. SPECIFICATIONS 4-way cassette type Model name MMU-UB0071HP-UL MMU-UB0091HP-UL MMU-UB0121HP-UL MMU-UB0151HP-UL MMU-UB0181HP-UL Cooling Capacity 12.0 15.4 18.0 (kBTU/h) Heating Capacity 10.5 13.5 17.0 20.0 (kBTU/h) Power supply 1Ph. 208/230V ~ 60Hz. Electrical Running current 0.23 0.23 0.23 0.28 0.29 characteristics Power consumption 0.021 0.021...
  • Page 14 4-way cassette type Model name MMU-UB0241HP-UL MMU-UB0301HP-UL MMU-UB0361HP-UL MMU-UB0421HP-UL MMU-UB0481HP-UL MMU-UB0541HP-UL Cooling Capacity 24.0 30.0 36.0 42.0 48.0 54.0 (kBTU/h) Heating Capacity 27.0 34.0 40.0 47.5 54.0 60.0 (kBTU/h) Power supply 1Ph. 208/230V ~ 60Hz. Electrical Running current 0.38 0.43 0.73 0.88 0.88...

  • Page 15: Dimensional Drawing

    2. DIMENSIONAL DRAWING MMU-UB0071HP-UL, MMU-UB0091HP-UL, MMU-UB0121HP-UL, MMU-UB0151HP-UL, MMU-UB0181HP-UL, MMU-UB0241HP-UL, MMU-UB0301HP-UL Unit : in (mm) 33.9"(860) to 35.8"(910) Ceiling open dimension 11.8"(300) or less Bottom face of ceiling Indoor unit Drain upstanding size 39.4"(1000) or more A (Liquid side) For UB007~UB018 : Ø1/4'' (6.4) Take-in port of wiring An obstacle 1.2"...
  • Page 16 MMU-UB0361HP-UL, MMU-UB0421HP-UL, MMU-UB0481HP-UL, MMU-UB0541HP-UL Unit : in (mm) 33.9"(860) to 35.8"(910) Ceiling open dimension 11.8"(300) or less Bottom face of ceiling Indoor unit Drain upstanding size 39.4"(1000) or more An obstacle 1.2" Bottom face of ceiling Take-in port of wiring (30) 39.4"(1000) or more...

  • Page 17: Wiring Diagrams

    3. WIRING DIAGRAM - 17 -...

  • Page 18: Parts Rating

    4. PARTS RATING MMU- Model UB030 UB007 UB009 UB012 UB015 UB018 UB024 Fan motor LDF-340-60AA1 Motor for horizontal grille MSBPC20F04 Pulse motor valve PAM-B25YGTF-2 PAM-B40YGTF-2 TA sensor 12.9" (328 mm) TC1 sensor Ø0.16"(4mm), 39.4" (1000mm) TC2 sensor Ø0.24"(6mm), 39.4" (1000mm) TCJ sensor Ø0.24"(6mm), 39.4"...

  • Page 19: Refrigerant Cycle Diagram

    5. REFRIGERATING CYCLE DIAGRAM Liquid side Gas side Strainer Capillary tube Air 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 CN082 (6P): Blue) 1) Controls super heat in cooling operation 2) Controls under cool in heating operation...

  • Page 20: Control Outline

    6. CONTROL OUTLINE 6-1. 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 21 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 (+3.6°F)
  • Page 22 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 23 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 24 Item Outline of specifications Remarks Freeze prevention TC1: Temperature of indoor 1. In all cooling operation, the air conditioner operates control (Low temp. heat exchanger sensor as described below based upon temp. detected by release) TC1, TC2 and TCJ sensors. When “J”...

  • Page 25: Drain Pump Control

    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 26 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. •...

  • Page 27: In Cooling/Dry Operation

    Item Outline of specifications Remarks Louver control: 1) Louver position setup The louver position at horizontal discharge • When the louver position is changed, the position moves position at under AP030 necessarily to downward discharge position once to return to differs from that at over the set position.
  • Page 28 Item Outline of specifications Remarks <<Selection of Swing mode>> Louver control (Continued): • For the Swing mode, the following three types of modes are selectable and settable by keeping Swing/Direction on the remote controller. 1) Standard (4 pieces: same phase) swing →...
  • Page 29 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 30 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 31 Item Outline of specifications Remarks Secondary DN [C5] Data Secondary heating mode heating 0000 Normal mode (Factory default) (Continued) 0001 Flip mode DN [C6] Data : Set temp. out (high) [ºF(ºC)] -0015 "-0015": 5ºF(-15ºC) to "0015": 59ºF(15ºC) "0000": 32ºF(0ºC) (Factory default) 0015 DN [C7] Data...

  • Page 32: Communication Type, Model Names And The Maximum Number Of Connectable Units

    7. COMMUNICATION TYPE, MODEL NAMES AND THE MAXIMUM NUMBER OF CONNECTABLE UNITS If TU2C-Link (U series) is combined with TCC-Link (other than U series), the wiring specifications and the maximum number of connectable indoor units during group control operation will be changed. (1) For wiring specifications, carry out the installation, maintenance, or repair according to the attached Installation Manual.

  • Page 33: Configuraion Of Control Circuit

    8. CONFIGURATION OF CONTROL CIRCUIT 8-1. Indoor controller block diagram (MCC-1797) 8-1-1. In case of connection of wired remote controller Wired remote controller (Up to 2 units) Display LCD Function setup Key switch Display LED DC5V Power circuit EEPROM Remote controller communication circuit Indoor unit (Follower)

  • Page 34: In Case Of Connection Of Wireless Remote Controller

    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-1797) DC20V Remote controller Remote controller communication circuit communication circuit Emergent operation Power circuit EEPROM DC5V DC5V...

  • Page 35: Connection Of Both Wired Remote Controller And Wireless Remote Controller

    8-1-3. Connection of both wired remote controller and wireless remote controller Wired header remote controller Schedule timer Display LCD Function setup Display driver Key switch EEPROM Function setup DC5V DC5V Power Display LED Key switch circuit Power Remote controller Secondary circuit communication circuit battery...

  • Page 36: Indoor Print Circuit Board

    8-2. Indoor Print Circuit Board MCC-1797 - 36 -...

  • Page 37: Optional Connector Specifications Of Indoor P.c.board

    8-3. Optional Connector Specifications of Indoor P.C. Board Connector Function Specifications Remarks Secondary heating CN32 Secondary Heating Output (DN [191] = 01) DC12V � output / Ventilation Secondary heating can be used while heating output operation are performed. Output � Ventilation Output (DN [191] = 00) Single operation by FAN button on remote controller is set up from remote controller (DN = 31)

  • Page 38: Functions At Test Run

    8-4. 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 39  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.
  • Page 40 � 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 41: Applied Control

    9. APPLIED CONTROL 9-1. Setup of Selecting Function in Indoor Unit (Be Sure to Execute Setup by a Wired Remote Controller) <RBC-AWSU52-UL> Press [ Menu] to open the “Menu” Press and hold [ Menu] and [ ] at the same time to open “Field setting menu” ...
  • Page 42 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 43 Item Description At shipment ° : F ° 0001: °F c i t Refer to page 23, item No.6 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 0000: Unavailable...
  • Page 44 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 45: Indoor Unit Capacity

    TYPE CODE No. [10] Setup data Type Abbreviated Model name *1 0001 4-way Cassette MMU-UB *** 1HP-UL *1: Initial setting value of EEPROM installed on the service P .C. board Indoor unit capacity CODE No. [11] Setup data Model Setup data Model 0001 0013...

  • Page 46: Applied Control In Indoor Unit

    9-2. 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 47: Ventilating Fan Control From Remote Controller

    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 48 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 49 [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 50 [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 51 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 52 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 53 <Indoor unit address> ] to black highlight the item code (DN), and then press [ ] and [ ] to set the item code No. to 13. Press [ Press [ ] to black highlight the data, and then press [ ] and [ ] to set the data indoor unit address.
  • Page 54 To find an indoor unit’s position from its address Procedure to know the position of indoor unit body by address while indoor unit No. is known. • Confirm each indoor unit address while indoor unit is stopped. (Be sure to stop air conditioner.) <RBC-AWSU52-UL>...

  • Page 55: Check Code Clearing Function

    Check code clearing function How to clear the check code using the wired remote controller <RBC-AW5U52-UL> Displays the last 10 check codes, and at which unit and when they occurred. In the “Field setting menu” screen, press ] and [ ] to select “Alarm history”, and then press [ Set/Fix]...
  • Page 56 Monitoring function of wired remote controller <RBC-AWSU52-UL> Displays the codes and data indicating the operating condition and temperature of each sensor on the indoor units, outdoor units, and remote controllers. In the “Field setting menu screen, press ” ] and [ ] to select “Monitor function ”...

  • Page 57: Troubleshooting

    10. TROUBLESHOOTING 10-1. Overview (1) Before engaging in troubleshooting (a) Applicable models All Super Modular Multi System (SMMS- ) models. (Indoor units: MM -UB , Outdoor units: MMY-MUB (b) Tools and measuring devices required • Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc.

  • Page 58: Troubleshooting Method

    10-2. 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 59 (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 60 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 61 Check code Display of receiving unit Outdoor 7-segment display Indicator light block Typical problem site Description of problem Sub-code • There is no communication from Leak Detector • A Malfunction signal received from Leal Detector. Detected indoor unit address *Not displayed Refrigerant leak detection Leak Detector detects refrigerant leak depending on the DN...
  • Page 62 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 63 (Check code detected by Inverter of Compressor featuring in outdoor unit - typical examples) Check code Display of receiving unit Outdoor 7-segment display Indicator light block Central Typical problem site Description of proplem control or main remote Operation Timer Ready Sub-code controller Flash...

  • Page 64: Troubleshooting By Check Display On Remote Controller

    10-3. Troubleshooting by check Display on Remote Controller <RBC-AWSU52-UL> Check code When an error occurs in the air conditioner, the check Indoor unit number code and the indoor unit number flash on the display of the remote controller. * The check code is only displayed during the operation.
  • Page 65 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 “10-2. Troubleshooting method”. : Blinking (0.5 seconds) : Lighting : Goes off...
  • Page 66 Light block Check code Cause of trouble 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 67 Light block Check code Cause of trouble Operation Timer Ready Occupancy sensor trouble Outdoor EEPROM trouble Synchronized blinking Other (indications not involving check code) Light block Check code Cause of trouble Operation Timer Ready – Test run in progress Synchronized blinking Operation Timer Ready Setting incompatibility...

  • Page 68: Check Codes Displayed On Remote Controller And Smms Series Outdoor Unit (7-Segment Display On I/F Board) And Locations To Be Checked

    10-4. 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 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 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 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 Too many All stop • Combined capacity of • Check capacities of indoor Capacity over indoor units indoor units is too large.
  • 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 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 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 TD2 sensor All stop Sensor resistance is infinity • Check connection of TD2 trouble or zero (open/short circuit). sensor connector.
  • 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 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 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 TD1 sensor All stop Discharge temperature of • Check installation of TD1 miswiring compressor 1 (TD1) does 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 01: TK1 oil Oil level All stop No temperature change is • Check for disconnection of circuit trouble detected by TK1 despite TK1 sensor.
  • 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 • Check detection status of Leak leak detection • unit address from • Stop of Indoor unit —...
  • 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 Outdoor All stop Initial setting of I/F P.C. • Check model setting of — capacity not set board has not been P.C.
  • 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 1∗: Compressor Activation of All stop High-pressure SW is • Check connection of high- 1 side high-pressure activated.
  • 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 Detected indoor Indoor unit Indoor overflow All stop • Float switch operates. • Check float switch address trouble •...
  • Page 80 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 81 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 82 Check codes Displayed on 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 Indoor unit Indoor-remote Stop of There is no communication •...
  • Page 83 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 84: Diagnostic Procedure For Each Check Code (Indoor Unit)

    10-5. Diagnostic Procedure for Each Check Code (Indoor Unit) - 84 -...
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  • Page 97: Sensor Characteristics

    10-6. 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 98: Replacement Of Service P.c.board

    11. REPLACEMENT OF SERVICE P.C. BOARD Replacement of P.C. Board for Indoor Unit Servicing <Models> MMU-UB***1HP -UL Series <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. When replacing the P.C. board for indoor unit servicing, follow the procedures below. After replacement completes, confirm whether the settings are correct by checking the indoor unit No.,Group header unit/ follower unit settings and perform the cooling cycle confirmation through the trial operation. <Replacement procedures> Case 1 Before replacement, the indoor unit can be turned on and the setting data can be read out by wired remote control operation. EEPROM data read out [1]  Replacement of P.C. board for Indoor unit servicing and power on [2]  Writing the read out EEPROM data [3]  Power reset(for all indoor units connected to the remote control when the group operation control is performed.) Case 2 The EEPROM before replacement is defective and the setting data cannot be read out. Writing the setting data to EEPROM, such as high ceiling installation setting and optional connection setting, etc., based on the customer information. [3]  Power reset (for all indoor units connected to the remote control when the group operation control is performed.) [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 [        Menu] to open the "Menu" Step 2 Push and hold [        Menu] and [       ] at the same time to open "Field setting menu".    (Push and hold 4 seconds.) Step 3 Push [       ] and [       ] to select " DN setting", and then push [       Set / Fix]. Step 4 Select "Indoor unit", and the push  [       Set / Fix].
  • Page 99 CODE No.required at least 1. The CODE No. for the Indoor unit type and Indoor unit capacity Contents are 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 manual resetting may be required again. Indoor unit address (when the multiple units group operation including twin system.) Group address Communication protocol 1FC Indoor Unit terminating resistance [2] P.C. Board for indoor unit servicing replacement procedures Step 1 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) setting(cut),switch SW501, SW502 (short-circuit) connector CN34 as the setting of the P.C. board before replacement. Connector (CN504) L401 for drain pump SW502 CN504 SW501 (WHI) If the plug for short-circuit is attached on the P.C. board before replacement, attach it on the P.C. board replaced. CN34 (RED) IC501 Step 2 It is necessary to set Indoor unit to be exchanged : Remote controller = 1:1 Based upon the system configuration, turn on power of the indoor unit with one of the following items. 1) Single (Individual) operation Turn on power of the indoor units and proceed to ...
  • Page 100 [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.) Step 1 Push [        Menu] to open the "Menu" <Fig. 1 RBC-AWSU5*-UL> Step 2 Push and hold [        Menu] and [       ] at the same time to open "Field setting menu". Room 12:00 (Mon)    (Push and hold 4 seconds.) Step 3 Push [       ] and [       ] to select " DN setting", and then push [       Set / Fix]. Set temp. (Cool) Step 4 Select "Indoor unit", and the push  [       Set / Fix]. Step 5 For group operation, all connected room in the system are displayed. ON/OFF    Select the unit whose EEPROM contents you want to read and push [       Set / Fix].       The fan of the selected indoor unit operates and the flap swings. Step 6 Push [       ] to black highlight the code (DN), and then push [       ] and [       ] to set the code     (Set the indoor unit type and capacity) The factory-set values shall be written to the EEPROM by changeing the type and capacity. 1. Set the CODE No. (DN) to 10 (without change) Push [       ] to black highlight the data, and then push [           ] and [       ] to set the type. (Refer to Type DN code "10".) 3. After finishing setting the data of the code (DN), push [       Set / Fix]       "Continues ?" is displayed. 4. To set the data of other codes (DN), push [       Set / Fix] 5. Push [       ] to black highlight the code (DN), and then push [       ] and [       ] to set the code No. to 11.  6.
  • Page 101 Table 1.Setting data(CODE No. table(example)) Item Setting data Factory­set 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 0002 : +2°C Automatic mode 0001 : No automatic Cooling only 0000 : Heat pump Type Depending on model type Indoor unit capacity According to capacity type Line address 00Un/0099 : Unfixed Indoor unit address 00Un/0099 : Unfixed Group address 00Un/0099 : Unfixed Flap type (Wind direction adjustment) Depending on Type Temperature range of cooling/heating 0003 : 3 deg (Ts±1.5) automatic SW control point Automatic restart of power failure 0001 : Enable 0000 : None Selection of option / Trouble input 0002 : None (TCB­PCUC2E: CN3) Themo output SW 0000 : Thermo ON HA terminal (CN61) select 0000 : Usual (HA terminal)

  • Page 102: Detachments

    12. DETACHMENTS Indoor Unit Part name Procedure Remarks 1. Detachment Suction grille Suction grille 1) Stop operation of the air conditioner and Hook then turn off switch of the breaker. Ceiling panel Slide the 2 knobs of the suction grille While inward and then hang down the suction pushing...
  • Page 103 Part name Procedure Remarks Electric 1. Detachment Claw of parts cover electric parts box Bell mouth pin 1) Carry out work of item 1. of 1. 2) Remove the fixing screw A which fix the electric parts cover and loosen the fixing screw B Sliding direction 3) Pull down the electric parts cover,...
  • Page 104 Part name Procedure Remarks 1. Detachment Adjust corner 1) Pull the knob of the adjust corner cap to the arrow direction. Ceiling panel Adjust corner NO TE : The adjust corner cap will bekept being hung with a f alling-preventive st rap. 2.
  • Page 105 Part name Procedure Remarks 1. Detachment Ceiling panel Clamper 1) Carry out works of item 1 of and item 1 of 3 . 2) Remove the flap connector (CN510, White, 20P) connected to the control P .C. board and then remove the lead wire from the clamp.
  • Page 106 Part name Procedure Remarks 1. Detachment Control P.C. board 1) Carry out work of 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) CN504 : Drain pump (2P , White)
  • Page 107 Part name Procedure Remarks 1. Detachment Drain cap Drain cap (outside) 1) Carry out work of item 1 of 1 . 2) Loosen screws (3 positions) fixing the drain cap (outside) and then turn the drain cap to the arrow mark direction to remove it. CLOSE CLOSE NOTE :...
  • Page 108 Part name Procedure Remarks Fixing screw A 1. Detachment Fan motor 1) Carry out work of item 1 of 2 . 2) Remove connectors which are connected from the control P.C.board to the other parts and then remove each wiring from the clamp. CN510 : Louver motor (20P,White) CN34 : Float switch (3P, Red)
  • Page 109 Part name Procedure Remarks 2. Attachment Fan motor (Continued) M6 nut 2) Fix the fan motor lead, TC sensor and TCJ sensor with the clamp of the bell mouth. 3) Mount the electric parts box with the fixing screws A and B. (Ø4 ×...
  • Page 110 Part name Procedure Remarks 1. Detachment Drain pump Fixing screw A 1) Carry out works of item 1 of 2 and item 1 of 6 . 2) Remove the drain pump connector (CN504, Drain port Drain port White, 2P) connected to the control P .C. board and then remove the lead wire from the clamp.
  • Page 111 Part name Procedure Remarks 1. Detachment Float switch assembly 1) Carry out works of item 1 of 7 and works from 1) to 5). Float switch assembly Float switch assembly 2) Remove the fixing screw and then remove the float switch assembly. (Ø4 × 25, 1 pc.) 2.
  • Page 112 Part name Procedure Remarks 1. Detachment Heat exchanger 1) Recover the refrigerant gas. 2) Carry out work of item 1 of 10 . 3) Remove refrigerant pipe at indoor unit side. 4) Remove the fixing screws and then remove the piping cover. (Ø4 ×10, 3 pcs.) 5) Remove the drain hose from the drain Piping cover pump and remove the fixing screws to...
  • Page 113 Part name Procedure Remarks Installation position (Inside Indoor Unit) Gas Leak Detection 1. Detachment 1) Perform works until opening of the electric parts box cover in works of item 1 of 2 2) Remove the connectors which connect to gas leak detection sensor the control P.C.

  • Page 114: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit MMU-UB0071HP-UL, MMU-UB0091HP-UL - 114 -...
  • Page 115 Model name Location MMU-UB****HP-UL Parts No. Description 0071 0091 43T20335 FAN,ASSY TURB 43T97001 43T39353 CAP,NUT 43T77301 PUMP ASSY 43T51314 SWITCH ASSY FLOAT 43T44797 REFRIGERATION CYCLE ASSY 43T72361 PAN ASSY, DRAIN 43T79317 LID ASSY, INSIDE 43T79319 LID ASSY, OUTSIDE 43T83312 STRING 43T22322 BELL MOUTH 43T19357...
  • Page 116 MMU-UB0121HP-UL, MMU-UB0151HP-UL, MMU-UB0181HP-UL, MMU-UB0241HP-UL, MMU-UB0301HP-UL - 116 -...
  • Page 117 Model name Location MMU-UB****HP-UL Parts No. Description 0121 0151 0181 0241 0301 43T20335 FAN,ASSY TURB 43T97001 43T39353 CAP,NUT 43T77301 PUMP ASSY 43T51314 SWITCH ASSY FLOAT 43T44893 REFRIGERANT CYCLE ASSY 43T44798 REFRIGERANTION CYCLE ASSY 43T44799 REFRIGERANTION CYCLE ASSY 43T72362 PAN ASSY, DRAIN 43T79317 LID ASSY, INSIDE 43T79319...
  • Page 118 MMU-UB0361HP-UL, MMU-UB0421HP-UL, MMU-UB0481HP-UL, MMU-UB0541HP-UL - 118 -...
  • Page 119 Model name Location MMU-UB****HP-UL Parts No. Description 0361 0421 0481 0541 43T20334 FAN,ASSY TURB 43T97001 43T39353 CAP,NUT 43T77301 PUMP ASSY 43T51314 SWITCH ASSY FLOAT 43T44800 REFRIGERATION CYCLE ASSY 43T72363 PAN ASSY, DRAIN 43T79317 LID ASSY, INSIDE 43T79319 LID ASSY, OUTSIDE 43T83312 STRING 43T22322...

  • Page 120: Electric Parts

    13-2. Electric parts Model name Location MMU-UB****HP-UL Part No. Description 0071 0091 0121 0151 0181 0241 43T50411 TC-SENSOR 43T50387 TC-SENSOR (TC2) 43T50386 TCJ SENSOR (RED) 43T60362 TERMINAL 43T60435 SERV-TERMINAL 43TNV644 PC BOARD ASSY (MCC-1797) 43T60547 ASM-HOUSING(PW) 43T60543 ASM-HOUSING(BUS) 43T60584 ASM-HOUSING(REM) 43T50409 TA-SENSOR Model name...
  • Page 121 RBC-U32PGP-UL Location Part No. Description RBC-U32PGP-UL 43T09533 GRILLE AINL 43T80350 AIR FILTER 43T21434 STEPPING-MOTOR 43T07317 AIR OUTLET FOAM (A) 43T07318 AIR OUTLET FOAM (B) 43T09531 LOUVER 43T01317 PANEL-COVER-ASSEMBLY 43T01332 ASM-COVER-PANEL 43T07320 PANEL FIX PLATE (A) 43T07321 PANEL FIX PLATE (B) 43T07324 HOOK 43T07319...
  • Page 122 RBC-U33P-UL Location Parts No. Description RBC-U33P-UL 43T00885 PANEL, INSULATOR ASSY 43T01338 PANEL, COVER ASSY 43T01343 PANEL,COVER,ASSY; TOSHIBA CARRIER 43T07330 PLATE, FIX PANEL (A) 43T07331 PLATE, FIX PANEL (B) 43T07332 HANGER FIXTURE 43T09625 GRILLE AIR INLET ASSY 43T07333 GRILLE HOOK LEFT...
  • Page 123 RBC-U33PB-UL Location Parts No. Description RBC-U33PB-UL 43T00926 PANEL, INSULATOR ASSY 43T01348 PANEL, COVER ASSY 43T01350 PANEL, COVER, ASSY; TOSHIBA CARRIER 43T07330 PLATE, FIX PANEL (A) 43T07331 PLATE, FIX PANEL (B) 43T07332 HANGER FIXTURE 43T09644 GRILLE AIR INLET ASSY 43T07343 GRILLE HOOK LEFT...

  • Page 124: Warnings On Refrigerant Leakage

    WARNINGS ON REFRIGERANT LEAKAGE Important Check of Concentration Limit The room in which the air conditioner is to be installed requires a design that in the event of NOTE 2 : refrigerant gas leaking out, its concentration will The standards for minimum room volume are as follows. not exceed a set limit.
  • Page 125 CARRIER AIR CONDITIONING (THAILAND) CO., LTD. 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANGPATHUMTHANI, PATHUMTHANI 12000, THAILAND...

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