Carrier TOSHIBA MMD-UP0241HP-UL Service Manual
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Carrier TOSHIBA MMD-UP0241HP-UL Service Manual

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SERVICE MANUAL
AIR-CONDITIONER
INDOOR UNIT
<
High Static Pressure Duct Type
MMD-UP0241HP-UL
MMD-UP0301HP-UL
MMD-UP0361HP-UL
MMD-UP0481HP-UL
MMD-UP0541HP-UL
R410A
FILE NO. SVM-22079
MULTI TYPE
>
January, 2023

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Summary of Contents for Carrier TOSHIBA MMD-UP0241HP-UL

  • Page 1 FILE NO. SVM-22079 SERVICE MANUAL AIR-CONDITIONER MULTI TYPE INDOOR UNIT < > High Static Pressure Duct Type MMD-UP0241HP-UL MMD-UP0301HP-UL MMD-UP0361HP-UL MMD-UP0481HP-UL MMD-UP0541HP-UL R410A January, 2023...

  • Page 2: Table Of Contents

    Original instruction Adoption of R410A Refrigerant This Air Conditioner is a new type which adopts a refrigerant R410A an environmentally friendly refrigerant. CONTENTS PRECAUTIONS FOR SAFETY ................1. SPECIFICATIONS ....................2. AIR DUCTING WORK..................... 3. DIMENSIONAL DRAWING..................4. WIRING DIAGRAMS ....................5.
  • Page 3 • The qualified service person is a person who installs, repairs, maintains, relocates and removes the air conditioners made by Toshiba Carrier Corporation. He or she has been trained to install, repair, maintain, relocate and remove the air conditioners made by Toshiba Carrier Corporation...
  • Page 4 Definition of Protective Gear When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective gloves and ‘safety’ work clothing. In addition to such normal protective gear, wear the protective gear described below when undertaking the special work detailed in the table below.
  • Page 5 Warning Indications on the Air Conditioner Unit [Confirmation of warning label on the main unit] Confirm that labels are indicated on the specified positions If removing the label during parts replace, stick it as the original. Warning indication Description WARNING WARNING ELECTRICAL SHOCK HAZARD ELECTRICAL SHOCK HAZARD...

  • 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 • Refrigerant R410A This air conditioner adopts a type refrigerant R410A which does not deplete the ozone layer. 1. Safety Caution Concerned to R410A 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 R410A Mixing of different types of oil may cause a trouble such as generation of sludge, clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types. 1) Tools exclusive for R410A 2) Tools exclusive for R410A, but can be also used for conventional refrigerant 3) Tools commonly used for R410A and for conventional refrigerant The table below shows the tools exclusive for R410A and their interchangeability.

  • Page 13: Specifications

    1. SPECIFICATIONS High Static Pressure Duct MMD-UP0241HP-UL MMD-UP0301HP-UL MMD-UP0361HP-UL Model name 24.0 30.0 36.0 Cooling Capacity (KBtu/h) 27.0 34.0 40.0 (KBtu/h) Heating Capacity 1Ph. 208/230V ~ 60Hz Power supply Running current 1.54 1.78 2.08 Electrical characteristics Power consumption 0.255 0.295 0.350 (kW) Starting current...
  • Page 14 High Static Pressure Duct MMD-UP0481HP-UL MMD-UP0541HP-UL Model name 48.0 54.0 (KBtu/h) Cooling Capacity 54.0 60.0 (KBtu/h) Heating Capacity 1Ph. 208/230V ~ 60Hz Power supply Running current 2.30 2.60 Electrical characteristics (kW) Power consumption 0.385 0.435 2.90 3.40 Starting current Main unit Zinc hot dipping steel plate Appearance Model name...

  • Page 15: Air Ducting Work

    2. AIR DUCTING WORK Static Pressure characteristics UP0301 type UP0241 type Standard air flow: 705 CFM Standard air flow: 885 CFM 1.30 1.30 1.20 1.20 1.10 1.10 1.00 1.00 0.90 0.90 1.0 in.WG- High tap 1.0 in.WG- High tap 0.80 0.80 0.70 0.70...
  • Page 16 The concealed high static pressure duct unit has 7 steps of static pressure (0.2-1.0 in. WG) adjustment to meet the installation site requirements / conditions. With these steps there are different speed fan taps associated to select correct air flow. For meeting the site requirement / conditions, make sure the external static pressure and air flow are determined.

  • Page 17: Dimensional Drawing

    3. DIMENSIONAL DRAWING Unit : in (mm) Unit external dimension A External dimension of flange C Front View connecting port Refrigerant pipe Hole for hanging bolt E (Liquid side) (4-Ø 0.5” (12) × 1.2” (30)) 5.2” 3.9” 1.6” (131) Refrigerant pipe connecting port (100) (40) F (Gas side)
  • Page 18 Duct arrangement UP0241, UP0301 <Air outlet> 37.0”(940) (Outside) 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 0.8” (100) (100) (100) (100) (100) (100) (100) (100) (100) (20) There are the head of the screw(n=4). <Air inlet> Make a hole at the installation of inlet duct. 3.9”...
  • Page 19 UP0361, UP0481, UP0541 <Air outlet> 52.8”(1340) (Outside) 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 3.9” 0.8” (100) (100) (100) (100) (100) (100) (100) (100) (100) (100) (100) (100) (100) (20) There are the head of the screw(n=4). <Air inlet>...

  • Page 20: Wiring Diagrams

    4. WIRING DIAGRAMS 1 2 3 4 5 - 20 -...

  • Page 21: Parts Rating

    5. PARTS RATING Model MMD-UP****HP-UL 0361 0481 0541 0241 0301 ICF-340W250-2A MF-340W350-1A Fan motor Drain pump motor PMD-08D121TF-2 FS-1A-31-3 Float switch PAM-MD12TF-301 Pulse motor valve 12.9" (328 mm) TA sensor TC1 sensor ∅0.16"(4mm), 39.4" (1000mm) TC2 sensor ∅0.24"(6mm), 39.4" (1000mm) TCJ sensor ∅0.24"(6mm), 39.4"...

  • Page 22: 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 CN082 (6P): Blue)

  • Page 23: 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 24 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 25 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 26 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 27 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 28 Item Specification outline Remarks DC motor 1) When the fan operation has started, positioning of the stator and the rotor are performed. (Moves slightly with tap sound) 2) The motor operates according to the command from the indoor controller. Notes) •...
  • Page 29 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 30 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 31: Communication Type, Model Names And The Maximum Number Of Connectable Units

    8. COMMUNICATION TYPE, MODEL NAMES AND THE MAXIMUM NUMBER OF CONNECTABLE UNITS 8-1. This air conditioning (U series) has new communication specifications, and TU2C- Link (U series) and TCC-Link (other than U series) differ in a communication type. For the communication type and the model names such as each unit or remote controllers, refer to the following table.

  • Page 32: 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) Schedule timer (weekly timer mode.) Display LCD Function setup Display LCD LCD driver Display LED...

  • Page 33: 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 34: 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 35: Indoor Print Circuit Board

    9-2. Indoor Print Circuit Board MCC-1720 - 35 -...

  • Page 36: 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 37: 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 38 <RBC-AWSU52-UL> In the “Field setting menu” screen, press ] and [ ] to select “Test mode”, and then press [ Set/Fix]  Test mode is set, and returns to the “Field setting menu” screen. Press the [ Return] button 2 times, to open screen (2).

  • 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-AMT***> Push the buttons simultaneously and hold for at CODE No. least 4 seconds. SET DATA 00 01 SETTING TEST UNIT No.
  • Page 41 <RBC-AWSU52-UL> Press [ Menu] to open the “Menu” Press and hold [ Menu] and [ ] at the same time to open “Field setting menu”  Press and hold 4 seconds. In the “Field setting menu” screen, press ] and [ ] to select “DN setting”, and then press [ Set/Fix]...
  • 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 Description Item At shipment ° : F ° 0001: °F Refer to page 45. 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...
  • 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 Type DN code “10” Value Type Model MMU-UP****HP-UL 4 Way Cassette 0001 MMD-UP****HP-UL High Static Pressure Duct Type 0006 *1 Default value stored in EEPROM mounted on service P.C. board Indoor Unit Capacity DN code “11” Value Capacity 0000* Invalid 0011 024 type 0013...

  • Page 46: 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 47 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 <RBC-AWSU52-UL> Press [ Menu] to open the “Menu” Press and hold [ Menu] and [ ] at the same time to open “Field setting menu” Press and hold 4 seconds. In the “Field setting menu” screen, press [ ] and [ ] to select “DN setting”, and then press [ Set/Fix] Press [...
  • Page 49 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 50 [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 51 [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 52 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 53 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 54 <Indoor unit address> 13 13 13 13 13 Push the TEMP. buttons repeatedly to set the CODE No. to Push the TIME buttons repeatedly to set an indoor unit address. Push the button. (It is OK if the display turns on.) <Group address>...
  • Page 55 <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 56 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-AMT >...
  • Page 57 <RBC-AWSU52-UL> [Procedure] The position of indoor unit body by address Push the [ MENU] button to display the menu screen. Push and hold the [ MENU] button and the [ ] button at the same time to display the “Field setting menu”. →...
  • Page 58 Check code clearing function How to clear the check code using the wired remote controller <RBC-AMT > Clearing a check code of the outdoor unit Clear the currently detected outdoor unit for each refrigerant line to which the indoor unit controlled by the remote controller is connected.
  • Page 59 <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] NOTE • The check code history data shows a history of 10 occurrences. If the occurrences exceed 10, the oldest data is deleted. •...
  • Page 60 Monitoring function of wired remote controller <RBC-AMT > TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT FILTER RESET TEST SWING/FIX UNIT LOUVER Content Enter the service monitoring mode using the remote controller to check the sensor temperature or operation status of the remote controller, indoor unit, and outdoor unit.
  • Page 61 <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 62: 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 63: 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 64 (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 65 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 66 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 67 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 68 (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 69: Troubleshooting By Check Display On Remote Controller

    11-3. Troubleshooting by check Display on Remote Controller <RBC-AMT > (1) Checking and testing When a trouble occurs to an air conditioner, a check code and indoor unit No. are displayed on the display window of the remote controller. Check codes are only displayed while the air conditioner is in operation.
  • Page 70 <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. When the check code and indoor unit number are displayed, pressing [ Return] opens the “Check”...
  • Page 71 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 “11-2. Troubleshooting method”. : Blinking (0.5 seconds) : Lighting : Goes off...
  • Page 72 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 73 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 74: (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 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 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 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 Too many All stop • Combined capacity of • Check capacities of indoor Capacity over indoor units indoor units is too large.
  • Page 77 Check code Location Check code detection Main Outdoor 7-segment display Description System status Check items (locations) condition(s) remote Check detection Sub-code controller code Detected 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 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 TD2 sensor All stop Sensor resistance is infinity • Check connection of TD2 trouble or zero (open/short circuit). sensor connector.
  • 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 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 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 TD1 sensor All stop Discharge temperature of • Check installation of TD1 miswiring compressor 1 (TD1) does sensor.
  • 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 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 82 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 83 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 84 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 85 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 86 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 87 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 88 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 89: Diagnostic Procedure For Each Check Code (Indoor Unit)

    11-5. Diagnostic Procedure for Each Check Code (Indoor Unit) - 89 -...
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  • Page 97 Part name Checking procedure Concealed Duct High Measure the resistance value of each winding by using the tester. Static Pressure Type Fan motor ICF-340W250-2A Position Resistance value 12.4 ± 1.2 Ω Black–Red 12.4 ± 1.2 Ω Black–White ICF-340W250-2A Fan motor inside wiring diagram 12.4 ±...

  • 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 P.c.board For Indoor Unit Serviceing

    12. REPLACEMENT OF SERVICE P.C. BOARD Indoor Unit CAUTION <Note: when replacing the P.C. board for indoor unit servicing> The nonvolatile memory (hereafter called EEPROM, IC503) on the indoor unit P.C. board before replacement includes the model specific type information and capacity codes as the factory-set value and the important setting data which have been automatically or manually set when the indoor unit is installed, such as system/ indoor/group addresses, high ceiling select setting, etc.
  • Page 100 [1] Setting data read out from EEPROM (Stop the operation of the unit.) <RBC-AMT > [1] Setting data read out from EEPROM The setting data modified on the site, other than factory-set value, stored in the EEPROM shall be read out. Step 1 Push button on the remote controller simultaneously for more than 4 seconds.
  • Page 101 <RBC-AWSU52-UL> Push the [ MENU] button to display the menu screen. Push and hold the [ MENU] button and the ] button at the same time to display the “Field setting menu”. • Push and hold the buttons for more than 4 seconds. Push the [ ] / [ ] button to select...
  • Page 102 CODE No. required at least 1. The CODE No. for the Indoor unit type and Indoor unit capacity are Contents required to set the rotation number setting of the fan. 0010 Type 2. If the system/indoor/group addresses are different from those 0011 Indoor unit capacity before replacement, the auto-address setting mode starts and the...
  • Page 103 [3] Writing the setting data to EEPROM (Stop the operation of the unit.) <RBC-AMT > Step 1 Push buttons on the remote controller simultaneously for more than 4 seconds. * In the group control operation, the unit No. displayed for the first time is the header unit No.. At this time, the CODE No.
  • Page 104 <RBC-AWSU52-UL> Push the [ Menu] button to display the menu screen. Push and hold the [ Menu] button and the [ ] button at the same time to display the “Field setting menu”. • Push and hold the buttons for more than 4 seconds. ] / [ Push the [ ] button to select “7.
  • Page 105 Change “Code (DN)” to [0002] with the [ ] / [ ] button. (Filter pollution level) Perform the operation of . Check the other “Code (DN)” also, change “Data” into the setting data written down in [1] Setting data read out from EEPROM if the setting data is different. Return] button.
  • Page 106 Table 1.Setting data(CODE No. table(example)) Item Setting data Factory-set 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 +3.6°F( Heating suction temperature shift Automatic mode 0001 : No automatic Cooling only...

  • Page 107: Detachments

    13. DETACHMENTS WARNING CAUTION Be sure to stop operation of the air conditioner before Be sure to put on gloves during working time; work and then turn off switch of the breaker. otherwise an injury will be caused by a part, etc. NOTE In a section, Detachments, the models are expressed as follows for convenience.
  • Page 108 No. Part name Procedure Remarks Electric 1. Detachment ③ 1) Perform works of 1 of ①. parts box 2) Remove the indoor/outdoor connecting wire and remote controller wire from each terminal block. 3) Remove the connectors which connected from the control P.C. board to other parts. NOTE First unlock the housing and then remove the connectors.
  • Page 109 No. Part name Procedure Remarks 1. Detachment ⑤ Drain pump 1) Perform works until opening of the electric parts box Float switch cover in works of 1 of ②. 2) Remove the connectors which connect to float switch of the drain pump from the control P.C. board. Connector CN34 : Float switch (3P, Red) position...
  • Page 110 No. Part name Procedure Remarks ⑥ Fan motor, 1. Detachment 1) Perform works until opening of the electric parts box Fan, cover in works of 1 of ②. 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) Remove the fixing screws(Ø0.2''(4)x 0.3''(8), 2 pcs.) of...
  • Page 111 No. Part name Procedure Remarks Fan motor, ⑥ ～ Continuance from the page in front ～ Fan, Fan case CAUTION When replacing the fan motor, be sure to exchange the clamp filter with the fan motor lead wire. Fan case (upper) Fixing screw ⑦...
  • Page 112 No. Part name Procedure Remarks Heat 1. Detachment ⑧ 1) Recover the refrigerant gas and then remove the exchanger : Screw position UP0241 type refrigerant pipe of the indoor unit. 2) Perform works of 1 of ⑧. Heat exchanger fixed plate End plate 3) Pull out TC sensor and TCJ sensor wirings from the holder.

  • Page 113: Exploded Views And Parts List

    14. EXPLODED VIEWS AND PARTS LIST 14-1. Indoor Unit MMD-UP0241HP-UL, MMD-UP0301HP-UL - 113 -...
  • Page 114 Model name MMD-UP****HP-UL Location Part No. Description 0241 0301 43T72323 PAN ASSY, DRAIN 43T39361 FLANGE 43T79321 CAP, DRAIN 43T39415 BAND-MOTOR-R 43T39416 BAND-MOTOR-L 43T21513 MOTOR-FAN 43T22339 CASE, FAN, LOWER 43T20340 FAN, MULTI BLADE 43T22341 FAN, CASE, LOWER 43T44698 REFRIGERATION CYCLE ASSY 43T77303 PUMP ASSY 43T51312...
  • Page 115 MMD-UP0361HP-UL, MMD-UP0481HP-UL, MMD-UP0541HP-UL - 115 -...
  • Page 116 Model name MMD-UP****HP-UL Location Part No. Description 0361 0481 0541 43T72324 PAN ASSY, DRAIN 43T39362 FLANGE 43T79321 CAP, DRAIN 43T39426 BAND-MOTOR-R 43T39427 BAND-MOTOR-L 43T21512 MOTOR-FAN 43T22340 FAN, CASE, LOWER 43T20339 FAN, MULTI BLADE 43T22342 FAN, CASE, UPPER 43T44693 REFRIGERATION CYCLE ASSY 43T77303 PUMP ASSY 43T51312...
  • Page 117 14-2. Electric Parts CN104 IC501 IC503 SW501 CN33 RY01 CH-49-Z-T Lot No. R DB01 CN01 Model name MMD-UP****HP-UL Location Part No. Description 0241 0301 0361 0481 0541 43T50411 TC-SENSOR 43T50387 TC-SENSOR (TC2) 43T58320 REACTOR 43T60435 SERV-TERMINAL 43T60362 TERMINAL 43TN9870 PC BOARD ASSY(MCC-1720) 43T50351 HOLDER-TA 43T50386...
  • Page 118 WARNINGS ON REFRIGERANT LEAKAGE Check of Concentration Limit Important The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas NOTE 2 : leaking out, its concentration will not exceed a set limit. The standards for minimum room volume are as follows.
  • Page 119 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

This manual is also suitable for:

Toshiba mmd-up0301hp-ulToshiba mmd-up0361hp-ulToshiba mmd-up0481hp-ulToshiba mmd-up0541hp-ul

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