Toshiba MMD-UB0071BHP-UL Service Manual
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Toshiba MMD-UB0071BHP-UL Service Manual

Toshiba MMD-UB0071BHP-UL Service Manual

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SERVICE MANUAL
AIR-CONDITIONER
INDOOR UNIT
< Concealed Duct Standard Type >
MMD-UB0071BHP-UL
MMD-UB0091BHP-UL
MMD-UB0121BHP-UL
MMD-UB0151BHP-UL
MMD-UB0181BHP-UL
MMD-UB0211BHP-UL
MMD-UB0241BHP-UL
MMD-UB0301BHP-UL
MMD-UB0361BHP-UL
MMD-UB0421BHP-UL
MMD-UB0481BHP-UL
MMD-UB0541BHP-UL
R454B
FILE NO. SVM-24060
MULTI TYPE
February, 2025

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Summary of Contents for Toshiba MMD-UB0071BHP-UL

  • Page 1 FILE NO. SVM-24060 SERVICE MANUAL AIR-CONDITIONER MULTI TYPE INDOOR UNIT < Concealed Duct Standard Type > MMD-UB0071BHP-UL MMD-UB0091BHP-UL MMD-UB0121BHP-UL MMD-UB0151BHP-UL MMD-UB0181BHP-UL MMD-UB0211BHP-UL MMD-UB0241BHP-UL MMD-UB0301BHP-UL MMD-UB0361BHP-UL MMD-UB0421BHP-UL MMD-UB0481BHP-UL MMD-UB0541BHP-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 ....................2. AIR DUCTING WORK..................... 3. DIMENSIONAL DRAWING..................4. WIRING DIAGRAMS ....................5. PARTS RATING ...................... 6. REFRIGERANT CYCLE DIAGRAM ............... 7.

  • 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

    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 HFC type refrigerant (R454B) which does not deplete the ozone layer. 1. Safety Caution Concerned to Refrigerant The pressure of R454B is high 1.6 times of that of the former refrigerant (R22). 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 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 Concealed Duct type MMD-UB0071BHP-UL MMD-UB0091BHP-UL Model name 7.50 9.50 Cooling Capacity (KBtu/h) 8.50 10.5 Heating Capacity (KBtu/h) 1Ph. 208/230V ~ 60Hz Power supply Running current 0.45 0.58 Electrical characteristics Power consumption 0.070 0.090 (kW) Starting current 0.65 0.78...
  • Page 14 Concealed Duct type Model name MMD-UB0121BHP-UL MMD-UB0151BHP-UL MMD-UB0181BHP-UL MMD-UB0211BHP-UL 15.4 18.0 21.0 (KBtu/h) 12.0 Cooling Capacity 17.0 20.0 24.0 (KBtu/h) 13.5 Heating Capacity 1Ph. 208/230V ~ 60Hz Power supply Running current 0.83 0.83 0.90 1.25 Electrical characteristics Power consumption 0.130 0.140 0.210 (kW)
  • Page 15 Concealed Duct type Model name MMD-UB0241BHP-UL MMD-UB0301BHP-UL MMD-UB0361BHP-UL 24.0 30.0 36.0 (KBtu/h) Cooling Capacity (KBtu/h) 27.0 34.0 40.0 Heating Capacity 1Ph. 208/230V ~ 60Hz Power supply 1.97 Running current 1.25 1.31 Electrical characteristics Power consumption (kW) 0.210 0.220 0.330 Starting current 2.05 2.11 2.77...
  • Page 16 Concealed Duct type MMD-UB0421BHP-UL MMD-UB0481BHP-UL MMD-UB0541BHP-UL Model name 42.0 48.0 54.0 (KBtu/h) Cooling Capacity 47.5 54.0 60.0 (KBtu/h) Heating Capacity 1Ph. 208/230V ~ 60Hz Power supply 1.97 Running current 2.03 2.03 Electrical characteristics Power consumption 0.330 0.340 0.340 (kW) Starting current 2.77 2.83 2.83...

  • Page 17: Air Ducting Work

    2. AIR DUCTING WORK Static pressure characteristics UB0071 type UB0091type Standard air flow: 320 CFM Standard air flow: 395 CFM 0.80 0.70 0.60 0.6 in.WG- High tap 0.50 0.6 in.WG- High tap 0.4 in.WG- Mid 0.40 0.4 in.WG- Mid tap 0.30 0.4 in.WG- Low tap 0.4 in.WG-Low tap...
  • Page 18 UB0361, UB0421 type UB0481, UB0541 type Standard air flow: 1130 CFM Standard air flow: 1175 CFM 0.8 in.WG- H 0.8 in.WG- High tap 0.6 in.WG- Mid tap 0.6 in.WG- Mid tap 0.6 in.WG- High tap 0.6 in.WG- High tap 0.6 in.WG- Low tap 0.6 in.WG- Low tap 0.4 in.WG- High tap 0.4 in.WG-...

  • Page 19: Dimensional Drawing

    3. DIMENSIONAL DRAWING Unit : in (mm) Hanging bolt pitch B 0.9"(22) 29.5"(750) Main unit dimension A 2.0"(50) Hanging bolt pitch 25.6"(650) 2.0"(50) External dimensions of flange C 13.6"(345) 7.4" (187.5) 14.0"(355) 1.0"(25) Access panel 16.3"(415) Electrical Drain pan / Drain control box 22.4"(570) pump check cover...
  • Page 20 UB0071, UB0091 UB0121, UB0151, UB0181 <Bottom air intake> <Bottom air intake> 37.8" 26.0" (959.4) (659.4) 1.5" 3.9" 3.9" 3.9" 3.9" 3.9" 3.9" 3.9" 3.9" 3.9" 1.5" 1.5" 3.9" 3.9" 3.9" 3.9" 3.9" 3.9" 1.5" (37.5) (100) (100) (100) (100) (100) (100) (100) (100)

  • Page 21: Wiring Diagrams

    4. WIRING DIAGRAMS - 21 -...

  • Page 22: Parts Rating

    5. PARTS RATING 0071BHP-UL 0091BHP-UL 0121BHP-UL 0151BHP-UL 0181BHP-UL Model MMD-UB WDF-340W150AA1 WDF-340W150AA Fan motor PMD-08D12TF-2 Drain pump motor Float switch FS-1A-31-3 PAM-B25YGTF-2 PAM-B40YGTF-1 Pulse motor valve 12.9" (328 mm) TA sensor Ø0.16"(4mm), 39.4" (1000mm) TC1 sensor Ø0.24"(6mm), 39.4" (1000mm) TC2 sensor Ø0.24"(6mm), 39.4"...

  • Page 23: Refrigerant Cycle Diagram

    6. REFRIGERANT CYCLE DIAGRAM Indoor unit Liquid side Gas side Strainer Capillary tube Heat exchanger 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 (Connector CN82 (6P): Blue)

  • Page 24: Control Outline

    7. CONTROL OUTLINE Indoor unit Control specifications Item Specification outline Remarks Upon power 1. Identification of outdoor unit supply reset When the power supply is reset, the outdoor unit is identified, and control is redirected according to the identification result. 2.
  • Page 25 Item Specification outline Remarks Fan speed 1. The fan operates in one of the four speed modes of “HIGH (HH)”, “MED HH > H+ > H > (H)”, “LOW (L)” and “AUTO” on the basis of a command issued via the L+ >...
  • Page 26 Item Specification outline Remarks Cold air 1. In heating operation, the upper limit of the fan tap is set according to the TCJ: Indoor heat discharge lower of whichever is the higher between TC2 sensor and TCJ sensor exchanger prevention temperatures, on the one hand, and TC1 sensor temperature, on the sensor control...
  • Page 27 Item Specification outline Remarks • Recovery operation Cooling oil While the outdoor unit is recovering cooling oil (refrigerant), the indoor normally takes (refrigerant) units perform the following control tasks: place roughly every recovery control [common for operational (cooling thermo ON / thermo OFF / FAN), as 2 hours.
  • Page 28 Item Specification outline Remarks Filter sign 1. The indoor fan’s cumulative hours of operation are counted, and when “FILTER ” displayed display these exceed the prescribed value (2500H), a filter replacement signal (not applicable is sent to the remote controller to display a filter sign on it. to wireless type) 2.
  • Page 29 Item Specification outline Remarks DC motor 1) When the fan operation has started, positioning of the stator and the Check code “P12” rotor are performed. (Moves slightly with tap sound) 2) The motor operates according to the command from the indoor controller.

  • Page 30: Outline Of Specifications

    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 (Continued) 0000 Normal mode (Factory default) 0001 Flip mode : Set temp. out (high) [ºF(ºC)] DN [C6] Data "-0015": 5ºF(-15ºC) to "0015": 59ºF(15ºC) -0015 "0000": 32ºF(0ºC) (Factory default) 0015 [ºF(ºC)] DN [C7]...

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

    8. 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: Applied Control And Functions (Including Circuit Configuration)

    9. APPLIED CONTROL AND FUNCTIONS (INCLUDING CIRCUIT CONFIGURATION) 9-1. Indoor Controller Block Diagram (MCC-1720) 9-1-1. In case of connection of wired remote controller. Wired header remote controller (Up to 2 units) Display LCD Function setup Display LED Key switch DC5V Remote controller Power circuit communication circuit...

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

    9-1-2. In case of connection of wireless remote controller. Display Operation Indoor unit #1 (Heder) (Follower) (Follower) Indoor control P.C. board (MCC-1720) EEPROM2 DC20V Remote controller EEPROM1 communication circuit DC5V TA sensor DC12V TC1 sensor Same as left Same as left TC2 sensor Drain Driver...

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

    9-1-3. In case of connection of wired remote controller and Wireless remote controller. Schedule timer (weekly timer mode.) Wired header remote controller (Up to 2 units) Display LCD Function setup Display LCD LCD driver Display LED Key switch Function setup Key switch DC5V Remote controller...

  • Page 36: Indoor Print Circuit Board

    9-2. Indoor Print Circuit Board MCC-1720 - 36 -...

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

    9-3. Optional connector specifications of indoor P.C. board Function Connector No. Pin No. Specification Remarks Fan output DC12 V Factory default setting: ON when indoor unit in operation and OFF when indoor unit at rest CN32 Output * Fan can be operated on its own by pressing FAN button on remote controller (DN = 31) Start / stop input Start / stop input for HA (J01: In place / Removed =...

  • Page 38: Functions At Test Run

    9-4. 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: Test Operation Of Indoor Unit

    9-5. Test operation of indoor unit 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 40: Applied Control

    10. APPLIED CONTROL 10-1. 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 41 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 42 Description Item At shipment ° : F ° 0001: °F c i t 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 0002: Available 0000: Unavailable...
  • Page 43 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 44 Type DN code “10” Value Type Model MMU-UB****HP-UL 4 Way Cassette 0001 MMD-UB****BHP-UL 0004 Concealed Duct Standard *1 Default value stored in EEPROM mounted on service P.C. board Indoor Unit Capacity DN code “11” Value Capacity 0000* Invalid 0001 007 type 0003 009 type 0005...

  • Page 45: Applied Control In Indoor Unit

    10- 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 46: 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 47 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 48 [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 49 [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 50 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 51 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 52 <RBC-AWSU52-UL> Operating LED Lights while operating. TA sensor selection Model name label Pair the indoor unit to set and the remote controller one-to-one. Turn on the power. Press [ Menu] to open the “Menu” Press and hold [ Menu] and [ ] at the same time to open “Field setting menu”...
  • Page 53 <Indoor unit address> ] to set the item code No. to 13. ] to black highlight the item code (DN), and then press [ ] and [ Press [ ] to set the data indoor unit address. Press [ ] to black highlight the data, and then press [ ] and [ After finishing setting the data of the item code (DN), press [ Set/Fix]...
  • 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

    11. TROUBLESHOOTING 11-1. 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 58: Troubleshooting Method

    11-2. 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 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 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 Central Indicator light block 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

    11-3. 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 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 67 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 68: (7-Segment Display On I/F Board) And Locations To Be Checked

    11-4. 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 When DN code • There is no Detected indoor Indoor unit Leak Detector • Check Malfunction LED of 06B = 0001 or communication from Leak Detector.
  • 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 TD1 sensor All stop Discharge temperature of • Check installation of TD1 miswiring compressor 1 (TD1) does 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 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 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)

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  • Page 97 Part name Checking procedure Concealed Duct type Measure the resistance value of each winding by using the tester. Fan motor WDF-340W150AA1 WDF-340W150AA, AA1 MMD-UB0071BHP-UL Position Resistance value UB0091BHP-UL 14.8 ± 1.5 Ω Black–Red WDF-340W150AA MMD-UB0121BHP-UL 14.8 ± 1.5 Ω Black–White...

  • Page 98: Sensor Characteristics

    11-6. Sensor characteristics Indoor unit Temperature sensor characteristics Indoor TA sensor Temperature Resistance [˚F (˚C)] [kΩ] Resistance 32 (0) 33.9 [kΩ] 41 (5) 26.1 50 (10) 20.3 59 (15) 15.9 68 (20) 12.6 77 (25) 10.0 86 (30) 95 (35) 104 (40) 113 (45) 122 (50)

  • Page 99: Replacement Of Service P.c.board

    12. REPLACEMENT OF SERVICE P.C. BOARD Replacement of P.C. Board for Indoor Unit Servicing <Models> MMD-UB***1BHP 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 100 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, J550, J551) setting(cut),switch SW501 (short-circuit) connector CN34 as the setting of the P.C. board before replacement. If the plug for short-circuit is attached on the P.C. board before replacement, attach it on the P.C. board replaced. J551 J550 Connector (CN504) IC503 SW501 for drain pump CN34 (Red) CN504 (White) 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 101 [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 the 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 102 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 103: Detachments

    NOTE In a section, Detachments, the models are expressed as follows for convenience. UB0071 : MMD-UB0071BHP-UL to MMD-UB0091BHP-UL UB0121 : MMD-UB0121BHP-UL to MMD-UB0181BHP-UL UB0211 : MMD-UB0211BHP-UL to MMD-UB0541BHP-UL Part name...
  • Page 104 Part name Procedure Remarks Suction panel 1. Detachment 1) Remove the fixing screws A which fix the suction panel. Loosen the fixing screws B. 2) Slide the suction panel to the arrow side and then remove the panel. 2. Attachment 1) Hook the suction panel to the fixing screws B and tighten screws.
  • Page 105 Part name Procedure Remarks Electric parts 1. Detachment 1) Perform works of 1 of (In case of under air intake) Perform works of 1 of (In case of back air intake) Perform works of 1 of 2) Remove the indoor/outdoor connecting wire and remote controller wire from each terminal block.
  • Page 106 Part name Procedure Remarks Fan motor, 1. Detachment Fan, 1) Perform works until opening of the electric parts box cover in works of 1 of Fan case 2) Remove connectors for fan motor wiring from control P.C. board. CN333 : Motor power supply (5P: White) CN334 : Motor control (5P: White) 3) Open the fan case (under) and remove it while pressing claws of the fan case...
  • Page 107 Part name Procedure Remarks Drain pan 1. Detachment 1) Remove the drain cap and then extract the Bottom base drain water accumulated in the drain pan. NOTE Do not hold the When removing the drain cap, be sure to drain socket. receive drain water using a bucket, etc.
  • Page 108 Part name Procedure Remarks Heat 1. Detachment : Screw position exchanger 1) Recover the refrigerant gas and then remove the refrigerant pipe of the indoor UB0071 Type unit. Heat exchanger End plate 2) Perform works of 1 of fixed plate 3) Pull out TC sensor and TCJ sensor wirings from the holder.
  • Page 109 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 Gas Leak Detection in works of item 1 of 4 Sensor position 2) Remove the connectors which connect to gas leak detection sensor the control P.C.

  • Page 110: Exploded Views And Parts List

    14. EXPLODED VIEWS AND PARTS LIST 14-1. Concealed duct type MMD-UB0071BHP-UL, MMD-UB0091BHP-UL - 110 -...
  • Page 111 Model name Location MMD-UB Part No. Description 0071BHP-UL 0091BHP-UL 43T39356 FLANGE 43T44802 REFRIGERATION CYCLE ASSY 43T70319 ASM-HOSE-DRAIN 43T77303 PUMP ASSY 43T51312 SWITCH, FLOAT 43T22337 CASE, FAN, UPPER 43T22335 CASE, FAN, LOWER 43T20340 FAN, MULTI BLADE 43T39416 BAND-MOTOR-L 43T39415 BAND-MOTOR-R 43T21556 FAN-MOTOR(WDF-340W150AA1) 43T39417 BASE-MOTOR...
  • Page 112 MMD-UB0121BHP-UL, MMD-UB0151BHP-UL, MMD-UB0181BHP-UL - 112 -...
  • Page 113 Model name Location MMD-UB Part No. Description 0121BHP-UL 0151BHP-UL 0181BHP-UL 43T39357 FLANGE 43T44804 REFRIGERANT CYCLE ASSY 43T44894 REFRIGERANT CYCLE ASSY 43T70319 ASM-HOSE-DRAIN 43T77303 PUMP ASSY 43T51312 SWITCH, FLOAT 43T22337 CASE, FAN, UPPER 43T22335 CASE, FAN, LOWER 43T20340 FAN, MULTI BLADE 43T39416 BAND-MOTOR-L 43T39415...
  • Page 114 MMD-UB0211BHP-UL, MMD-UB0241BHP-UL, MMD-UB0301BHP-UL - 114 -...
  • Page 115 Model name Location MMD-UB Part No. Description 0211BHP-UL 0241BHP-UL 0301BHP-UL 43T39358 FLANGE 43T44895 REFRIGERANT CYCLE ASSY 43T70319 ASM-HOSE-DRAIN 43T77303 PUMP ASSY 43T51312 SWITCH, FLOAT 43T22338 CASE, FAN, UPPER 43T22336 CASE, FAN, LOWER 43T20339 FAN, MULTI BLADE 43T39416 BAND-MOTOR-L 43T39415 BAND-MOTOR-R 43T21549 FAN-MOTOR (LDF-340W250A) 43T39418...
  • Page 116 MMD-UB0361BHP-UL MMD-UB0421BHP-UL, MMD-UB0481BHP-UL, MMD-UB0541BHP-UL - 116 -...
  • Page 117 Model name Location MMD-UB Part No. Description 0361BHP-UL 0421BHP-UL 0481BHP-UL 0541BHP-UL 43T39358 FLANGE 43T44805 REFRIGERATION CYCLE ASSY 43T70319 ASM-HOSE-DRAIN 43T77303 PUMP ASSY 43T51312 SWITCH, FLOAT 43T22338 CASE, FAN, UPPER 43T22336 CASE, FAN, LOWER 43T20339 FAN, MULTI BLADE 43T39416 BAND-MOTOR-L 43T39415 BAND-MOTOR-R 43T21549 FAN-MOTOR (LDF-340W250A)

  • Page 118: Electric Parts

    14-2. Electric Parts CN104 CN214 IC501 IC503 SW501 CN33 RY01 CH-49-Z-T Lot No. Ｒ DB01 CN01 Model name Location MMD-UB Part No. Description 0071BHP-UL 0091BHP-UL 0121BHP-UL 0151BHP-UL 0181BHP-UL 0211BHP-UL 43T50411 TC-SENSOR 43T50387 TC-SENSOR (TC2) 43T58320 REACTOR 43T60435 SERV-TERMINAL 43T60362 TERMINAL 43TNV645 PC BOARD ASSY (MCC-1720) 43T50351...

  • Page 119: 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 120 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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