Toshiba Carrier MMU-UB0071YHP-UL Service Manual
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Toshiba Carrier MMU-UB0071YHP-UL Service Manual

Toshiba Carrier MMU-UB0071YHP-UL Service Manual

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AIR CONDITIONER (MULTI TYPE)
SERVICE MANUAL
Indoor unit
<1-way cassette type>
MMU-UB0071YHP-UL
MMU-UB0091YHP-UL
MMU-UB0121YHP-UL
R454B
FILE NO. SVM-24101
February, 2025

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  • Page 1 FILE NO. SVM-24101 AIR CONDITIONER (MULTI TYPE) SERVICE MANUAL Indoor unit <1-way cassette type> MMU-UB0071YHP-UL MMU-UB0091YHP-UL MMU-UB0121YHP-UL R454B February, 2025...

  • Page 2: Table Of Contents

    Original instruction Adoption of R454B Refrigerant This Air Conditioner is an environmentally friendly refrigerant. CONTENTS PRECAUTIONS FOR SAFETY ..................1. SPECIFICATIONS ....................... CONSTRUCTION VIEWS (EXTERNAL VIEWS) ............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

    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 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 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 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 (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 2) Tools exclusive for R454B, but can be also used for conventional refrigerant 3) ools commonly used for R454B and for conventional refrigerant The table below shows the tools exclusive for R454B and their interchangeability.

  • Page 13: Specifications

    1. SPECIFICATIONS 1 Way cassette type Model name MMU-UB0071YHP-UL MMU-UB0091YHP-UL MMU-UB0121YHP-UL 7500 9500 12000 Cooling Capacity (Btu/h) 8500 10500 13500 Heating Capacity (Btu/h) Power supply 1Ph. 208/230V ~ 60Hz. Running current 0.17 0.18 0.19 Electrical characteristics Power consumption 0.017 0.018 0.019 (kW) Starting current...

  • Page 14: Construction Views (External Views)

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

  • Page 15: Wiring Diagrams

    3. WIRING DIAGRAM - 15 -...

  • Page 16: Parts Rating

    4. PARTS RATING MMU- Model UB007 UB009 UB012 WDF-340-30CA1 Fan motor 24BYJ48-ST Motor for horizontal grille PAM-B25YGTF-2 Pulse motor valve Lead wire length : 8.6" (218 mm) Vinyl tube TA sensor Ø0.16" (4 mm) size lead wire length : 39.4" (1000 mm ) Vinyl tube (Brown) TC1 sensor Ø0.24"...

  • Page 17: Refrigerant Cycle Diagram

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

  • Page 18: Control Outline

    6. CONTROL OUTLINE Control Specifications Item Outline of specifications Remarks When power 1) Distinction of outdoor unit supply is reset When the power supply is reset, the outdoors are distinguished and the control is selected according to the distinguished result. 2) Setting of indoor fan speed and existence of air direction adjustment Based on EEPROM data, select setting of the indoor fan...
  • Page 19 Item Outline of specifications Remarks Room temp. 2) Using the Item code 06, the setup temperature in heating Shift of return air control operation can be compensated. temperature in heating (Continued) operation SET DATA Temperature setting adjustment +0 ˚F +3.6 ˚F +7.2 ˚F +10.8 ˚F [+0˚C]...
  • Page 20 Item Outline of specifications Remarks Fan speed 1) By the command from remote control, fan speed is HH > H+ > H > L+ > L > UL selection changed. ((HH), (H+), (H), (L+), (L) or [AUTO]) 2) When the fan speed mode [AUTO] is selected, the fan Depending on the remote speed varies by the difference between TA and Ts.

  • Page 21: Reset Conditions

    Item Outline of specifications Remarks 1. In heating operation, the higher temperature of TC2 Prevention of cold TCJ: Temperature of indoor air discharge sensor and TCJ sensor is compared with temperature heat exchanger sensor of TC1 sensor and then the lower temperature is used •...
  • Page 22 Item Outline of specifications Remarks Refrigerant (Oil) Indoor units during stop/thermostat OFF or FAN Control is performed per two recovery control in operation perform following controls when a refrigerant hours or when the outdoor unit cooling operation (compressor oil) recovery signal is received from determines its need.(It varies outdoor unit at the cooling operation, depending on the indoor units...
  • Page 23 Item Outline of specifications Remarks Alarm output The alarm output from the indoor P.C. board is output in each Connector CN61 (Refer to 8-3-1,8-3-2. Optional setup indoor unit during group control, but it can be set so as to be connector specifications of output in the header unit and follower units.
  • Page 24 Item Outline of specifications Remarks Louver control 1) Louver position setup • When the louver position is changed, the position moves necessarily to downward discharge position once to return to the set position. • The louver position can be set up in the following operation range.
  • Page 25 Item Outline of specifications Remarks Louver control • If there is the locked louver in the unit, [ ] goes on the For the setting operation, remote controller screen. refer to [How to set louver (Continued) lock] of Installation Manual. •...
  • Page 26 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 27 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) [ºF(ºC)] -0015 "-0015": 5ºF(-15ºC) to "0015": 59ºF(15ºC) "0000": 32ºF(0ºC) (Factory default) 0015 DN [C7] Data...

  • Page 28: 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 29: 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 30: 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 31: 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 32: Indoor Print Circuit Board

    8-2. Indoor Print Circuit Board MCC-1797 - 32 -...
  • Page 33 - 33 -...

  • Page 34: Functions At Test Run

    8-3. Functions at test run � Cooling/Heating test run check The test run for cooling/heating can be performed from either indoor remote controller or outdoor interface P .C. board. 1. Start/Finish operation of test run � Test run from indoor remote controller Wired remote controller: Refer to the below item of “Test run”...
  • Page 35 � Check function for operation of indoor unit (Functions at indoor unit side) This function is provided to check the operation of the indoor unit singly without communication with the remote controller or the outdoor unit. This function can be used regardless of operation or stop of the system. However, if using this function for a long time, a trouble of the equipment may be caused.

  • Page 36: 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 37 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 38 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 39 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 40 Type DN code "10" Value Type Model 4-way cassette MMU-UB****HP-UL 0000* MMU-UB****YHP-UL 1-way cassette 0003 *1 : Initial setting value of EEPROM installed on the service P.C.Board. Indoor Unit Capacity DN code "11" 1-way cassette type Value Capacity 0000* Invalid 0001 0071 type 0003...

  • Page 41: 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 42: 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 43 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 44 [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 45 [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 46 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 47 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 48 <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 49 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 50: 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 51 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 52: 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 53: 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 54 (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 55 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 56 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 57 Check code Display of receiving unit Central Outdoor 7-segment display Indicator light block control or Typical problem site Description of problem main remote Operation Timer Ready Flash controller Sub-code 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 58 (Check code detected by Inverter of Compressor featuring in outdoor unit - typical examples) Check code Display of receiving unit Central Outdoor 7-segment display Indicator light block control or Typical problem site Description of proplem main remote Operation Timer Ready controller Flash Sub-code...

  • Page 59: 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 60 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 61 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 62 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 63: 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 64 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 Condition 1 No. of indoor Indoor unit Indoor-outdoor All stop • Check power supply to units from communication One indoor unit or more indoor unit.
  • Page 65 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 66 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 67 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 68 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code 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 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 TD1 sensor All stop Discharge temperature of • Check installation of TD1 miswiring compressor 1 (TD1) does sensor.
  • 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 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 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 • Check detection status of Leak leak detection • unit address from • Stop of Indoor 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 Outdoor All stop Initial setting of I/F P.C. • Check model setting of — capacity not set board has not been P.C.
  • 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 1∗: Compressor Activation of All stop High-pressure SW is • Check connection of high- 1 side high-pressure activated.
  • 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 Detected indoor Indoor unit Indoor overflow All stop • Float switch operates. • Check float switch address trouble •...
  • 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 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 76 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code 1∗: Fan P.C. Fan INV. Outdoor fan All stop Protected operation of Fan • Check fan motor. board 1 P.C.
  • Page 77 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 78 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 79: Diagnostic Procedure For Each Check Code (Indoor Unit)

    10-5. Diagnostic Procedure for Each Check Code (Indoor Unit) - 79 -...
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  • Page 92: 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 93: 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***1YHP-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 94 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 95 [3] Writing the setting data to EEPROM (The settings stored in the EEPROM of the P.C. board for indoor unit servicing are the factory-set values.) 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 96 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 97: Detachments

    12. DETACHMENTS Part name Procedure Remarks Air inlet grille CAUTION Be sure to put on the gloves and long-sleeved shirt at disassembling work; otherwise an injury will be caused by a part, etc. 1. Detachment (Fig. 1) 1) Stop operation of the air conditioner and then turn off switch of the breaker.
  • Page 98 Part name Procedure Remarks Control P.C.board 1. Detachment 1) Carry out work of item 1 of ① and item 1 of ②. 2) Remove connectors which are connected from the control P.C. board to the other parts and then remove wiring from the clamp. CN510 : Louver motor (20P, White) CN34 : Float switch (3P, Red)
  • Page 99 Part name Procedure Remarks Ceiling panel 1. Detachment (Fig. 6) 1) Carry out work of item 1 of ② and item 1 of ④. Terminal cover 2) Remove the flap connector (CN510, White, 20P) Electrical control Screw box cover connected to the control P.C. board and then CN510 Clamper Screw...
  • Page 100 Part name Procedure Remarks Drain pan 1. Detachment (Fig. 12) 1) Carry out work of item 1 of ⑤. 2) Remove the cap drain and then drain the Drain pan water accumulated in the drain pan. (Fig. 12) * When taking off the cap drain, be sure to prepare a bucket, etc.
  • Page 101 Part name Procedure Remarks Float switch 1. Detachment (Fig. 17) Nut fixing float switch 1) Carry out work of item 1 of 2) Remove the float switch connector (CN34, Red, 3P) connected to the control P.C. board and then remove the lead wire from the clamp.
  • Page 102 Part name Procedure Remarks Fan motor and 1. Detachment (Fig. 21) 1) Carry out work of item 1 of ⑥ and item 1 of Heat exchanger cross flow fan ⑩. 2) Remove the fan motor connector (CN210, White, 7P) connected to the control P.C. board and then remove the lead wire from the clamp.
  • Page 103 Part name Procedure Remarks Bearing 1. Detachment (Fig. 27) Carry out work of item 1 of ⑪. Push the bearing to inside hole of base bearing follow direction of arrow (Fig. 27) Pull the bearing follow direction of arrow Bearing (Fig.
  • Page 104 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 105: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST Indoor Unit 1-way cassette type - 105 -...
  • Page 106 Model name Location MMU-UB****YHP-UL Part No. Description 0071 0091 0121 43T70327 DRAIN HOSE ASSY 43T22312 BEARING ASSY, MOLD 43T21551 FAN-MOTOR(WDF-340-30CA1) 43T39428 MOTOR BAND DOWN 43T39429 MOTOR BAND UP 43T20362 CROSS FLOW FAN ASSY 43T44826 REFRIGERATION CYCLE ASSY 43T46568 BODY, PMV 43T46515 COIL, PMV 43T19321...

  • Page 107: Electric Parts

    Electric Parts CN82 CN210 CN61 CN22 SW501 CN510 DB01 SW502 CN521 Model name Location MMU-UB****YHP-UL Part No. Description 0071 0091 0121 43TNV644 PC BOARD ASSY (MCC-1797) 43T60362 TERMINAL 43T60078 TERMIMAL BLOCK 43T50389 TA-SENSOR 43T50477 TC-SENSOR (TC1) 43T50387 TC-SENSOR (TC2) 43T50386 TCJ SENSOR (RED) 43T50351 HOLDER-TA...
  • Page 108 RBC-UY32P-UL Location Part No. Description RBC-UY32P-UL 43T22378 HORIZONTAL LOUVER ASSY 43T01334 PANEL COVER ASSY 43T01335 PANEL COVER ASSY 43T09593 GRILLE ASSY 43T19381 GRILLE HOOK RIGHT 43T19382 GRILLE HOOK LEFT 43T80364 AIR FILTER 43T07327 PANEL FIXED PLATE 43T07328 LOUVER MOTOR COVER 43T21478 MOTOR;...

  • Page 109: 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 110 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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