Toshiba MM-A0280HT Service Manual
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Toshiba MM-A0280HT Service Manual

Modular multi split type system
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A90-0130
Modular
Multi System
Service Manual
Air Conditioner – Multi Split Type System
HFC
R407C

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Summary of Contents for Toshiba MM-A0280HT

  • Page 1 A90-0130 Modular Multi System Service Manual Air Conditioner – Multi Split Type System R407C...

  • Page 3: Table Of Contents

    Contents Introduction ..........4 Summary .
  • Page 4 Introduction Precautions Read these Safety Notes carefully before installing this unit. These Safety Notes contain very important safety information. Always be sure to observe these cautions. After installation is complete, trial the operation of the unit to make sure that it is operating normally.

  • Page 5: Summary

    Introduction Components 1. Outdoor Unit Inverter unit Fixed-speed unit Appearance Corresponding HP 10HP 10HP Model name MM-A0224HT MM-A0280HT MM-A0160HX MM-A0224HX MM-A0280HX Cooling capacity (kW) 22.4 28.0 16.0 22.4 28.0 Heating capacity (kW) 25.0 31.5 18.0 25.0 31.5 2. Outdoor Units (Combination of Outdoor Units)

  • Page 6: Operating Conditions

    Summary Operating Conditions The units referred to within this manual conform with the protection requirements of Directives 89/336/EEC Electromagnetic Compatibility and 73/23/EEC Low voltage. Operating conditions of the unit are as follows: Outdoor temperature -5 ~ 43°C Cooling -15 ~ 21°C Heating Room Temperature 18 ~ 32°C...

  • Page 7: Outline Of Mms (Modular Multi System)

    Summary Operating Conditions 1. Model name OUTDOOR MM–A0280HT A – Outdoor 0280 – 28.0kW (10HP) C – Cooling T – Inverter 0224 – 22.4kW (8HP) H – Heating X – Fixed Speed 0160 – 16.0kW (6HP) INDOOR MM–TU056 – Built-In Duct Type 028 –...
  • Page 8 Outline of MMS (Modular Multi System) Outline of MMS (Modular Multi System) Compact design The design of the Toshiba MMS outdoor unit allows for easy unit Branching maneuvering into any standard lift. Its size also allows it to be easily installed in limited spaces.

  • Page 9: Parts Specifications

    Parts Specifications Indoor Units Capacity code Cooling Capacity Heating Capacity Type Appearance Model name (kW) (kW) MM-U056 4 Way Cassette MM-U080 Type ‘U’ MM-U112 11.2 12.8 MM-U140 14.0 15.8 2 Way Cassette MM-TU028 Type ‘TU’ MM-TU042 MM-TU056 Built-In Slim Duct Type ‘SB’ MM-SB028 MM-B056 Built-In Duct,...

  • Page 10: Outdoor Units

    CHV-0712 CHV-0712 CHV-0712 CHV-0712 CHV-0401 Coil Specification AC240V AC240V AC240V AC240V AC240V MM-A0280HT, MM-A0224HT, MM-A0280HX, MM-A0224HX, MM-A0160HX PARTS NAME SPECIFICATION Model Name STF-200-350A Motor Type 1-Phase induction motor Power Supply AC 220-240V, 1 Phase, 50Hz Fan Motor Output (W) Current (A) 4.81~5.89...
  • Page 11 Parts Specifications Indoor Units Built-In Duct: MM-B140 PARTS NAME TYPE SPECFICATIONS Fan Motor STF-200-140-4F Output (rated) 140W, 4 pole, 200V, 1 Phase 50Hz Running Capacitor – fan motor EAG40M106UF AC 400V 10µF Pulse Motor Valve EDM-B60YPTF-7B-A Capacity: 60 Built-In Duct: MM-B112 PARTS NAME TYPE SPECFICATIONS...
  • Page 12 Parts Specifications Indoor Units 4-Way Cassette: MM-U140 PARTS NAME TYPE SPECFICATIONS Fan Motor MMF-230-36A Output (rated) 36W, 6 pole, 230V, 1 Phase 50Hz Running Capacitor – fan motor EVM45M305UF AC 450V, 3.0µF Pulse Motor Valve EDM-B60YPTF-7B-A Capacity: 60 4-Way Cassette: MM-U112 PARTS NAME TYPE SPECFICATIONS...

  • Page 13: Construction Views - Outdoor Units

    Construction Views Outdoor Units MM-A0280HT, MM-A0280HX, MM-A0224HT, MM-A0224HX, MM-A0160HX Grounding part of bottom plate Base 4-15 x 20 (Slot) Fixing bolt pitch Base Fixing bolt pitch Base bolt position Refrigerant pipe connecting port (Gas side) braze connection (ØA) Refrigerant pipe connecting port 2-60 x 150 Slot (Liquid side) flare connection (ØB)

  • Page 14: Construction Views - Indoor Units

    Construction Views Indoor Units Built-In Duct MM-B056, MM-B080, MM-B112, MM-B140 Nx Ø200 Unit Dimension:800 Hanging Bolt Air Outlet 4-M10 Hanging Bolt Pitch:565 Provided at site Unit Dimension A 6 x Ø4 holes (Ø160) Refrigerant Pipe Hanging Bolt Pitch B Connection J = M x K (Gas ØF) Fresh air inlet Ø125...
  • Page 15 Construction Views Indoor Units Built-In Slim Duct MM-SB028...
  • Page 16 Construction Views Indoor Units 4-Way Cassette MM-U056, MM-U080 Refrigerant pipe connection (Gas ØA) Refrigerant pipe connection (Liquid ØB) Wiring connection Ceiling Drain pipe connection Knockout for side ducts Ø150 (Gland plate 3xØ20 holes) (1" BSP threaded (both sides) connection) Fresh air inlet Condensate pipe 1"...
  • Page 17 Construction Views Indoor Units 4-Way Cassette MM-U112, MM-U140 Knockout for side ducts Ø150 Refrigerant pipe connection (both sides) (Gas side Ø19.0) Refrigerant pipe connection (Liquid side Ø9.5) Wiring connection Ceiling Ceiling Drain pipe connection (Gland plate 3xØ20 holes) panel (1" BSP threaded connection) Fresh air inlet Condensate pipe...

  • Page 18: Wiring Diagrams

    Wiring Diagrams Outdoor Units Inverter Unit (10HP , 8HP) MM-A0280HT, MM-A0224HT...
  • Page 19 Wiring Diagrams Outdoor Units Fixed Speed Unit (10-HP , 8HP) MM-A0280HX, MM-A0224HX...
  • Page 20 Wiring Diagrams Outdoor Units Fixed Speed Unit (6HP) MM-A0160HX...
  • Page 21 Wiring Diagrams Indoor Units Built-In Duct MM-B140, MM-B112, MM-B080, MM-B056...
  • Page 22 Wiring Diagrams Indoor Units Built-In Slim Duct MM-SB028...
  • Page 23 Wiring Diagrams Indoor Units 4-Way Cassette MM-U140, MM-U112, MM-U080, MM-U056...

  • Page 24: Refrigerant Piping Systematic Drawings

    Refrigerant Piping Systematic Drawings Inverter Unit (10HP , 8HP) Model: MM-A0280HT, MM-A0224HT Propeller fan Fan Motor Sensor Condenser (TE1) PMV (A) Condenser Sensor (TS) 4-Way valve Solenoid valve Pulse motor valve B (SV2) (Cooling bypass) (PMVB) High- pressure sensor Solenoid valve...
  • Page 25 Refrigerant Piping Systematic Drawings Fixed Speed Unit (10HP , 8HP) Model: MM-A0280HX, MM-A0224HX Propeller fan Fan Motor Sensor Condenser PMV (A) (TE1) Condenser Capillary Sensor (TS) 4-Way valve Solenoid valve Pulse motor valve B (SV2) (Cooling bypass) (PMVB) High- pressure sensor Solenoid valve Sensor...
  • Page 26 Refrigerant Piping Systematic Drawings Fixed Speed Unit (6HP) Model: MM-A0160HX Propeller fan Fan Motor Condenser PMV (A) Sensor (TE1) Condenser Capillary Sensor (TS) 4-Way valve Solenoid valve Pulse motor valve B (SV2) (Cooling bypass) (PMVB) High- pressure sensor Solenoid valve Check joint (Pd) Sensor (SV3C)

  • Page 27: Combined Refrigerant Piping Systematic Drawings

    Combined Refrigerant Piping Systematic Drawings Normal Operation (Cooling mode)
  • Page 28 Combined Refrigerant Piping Systematic Drawings Emergency Operation when Inverter Unit has Failed (Master unit back-up operation: Cooling mode)
  • Page 29 Combined Refrigerant Piping Systematic Drawings Emergency Operation when Fixed-Speed Unit has Failed (Cooling mode)
  • Page 30 Combined Refrigerant Piping Systematic Drawings Recovery of Refrigerant in Failed Outdoor Unit (Normal outdoor unit refrigerant recovery)

  • Page 31: Refrigerant Cycle Schematic

    Refrigeration Cycle Schematic Indoor Units Heat exchanger Distributor strainer Check PMV (D) joint Liquid Capillary sensor sensor Pressure tube (B) sensor Strainer Strainer Refrigerant Pipe Refrigerant (liquid) (A) Pipe (Gas) (C) Model Ø(A) mm Capillary Ø(B) mm Ø(C) mm PMV (D) Code MM-B056 6.4 (3/8”) Ø1.7x150Lx3...

  • Page 32: Outline Of Control

    Outline of Control Outdoor Unit Operation start/Operation end The compressor, solenoid valve, pulse motor valve (PMV), outdoor fan, etc. are controlled by a command from the indoor controller. The slave outdoor unit starts/stops by a command from the master outdoor unit. Operation start Operation stop Operation signal from indoor...
  • Page 33 Outline of Control Outdoor Unit Item Operation explanation and applied data, etc. Remarks 1a. Electronic (1) PMV A control (PMV x 2) expansion 1) The PMV (pulse motor valve) is controlled valve (PMV) between 100 ~ 1000 pulses during the control operation.
  • Page 34 Outline of Control Outdoor Unit Item Operation explanation and applied data, etc. Remarks 2b. Outdoor fan (1) Heating fan control control 1) The number of waves is controlled according to the TE sensor temperature. 2) If TE >20°C is constantly detected for 5 minutes, the operation will automatically shut down.
  • Page 35 Outline of Control Outdoor Unit Item Operation explanation and applied data, etc. Remarks 5. Oil equalizing This control is to prevent oil reduction in the control compressor between the outdoor units. This control is classified into two functions, one is an individual control in normal operation which is performed by the master outdoor unit, and the other is a system control which is executed when shortage has been detected in...
  • Page 36 Outline of Control Outdoor Unit Item Operation explanation and applied data, etc. Remarks (1) SV2 gas balance control 7. Release valve This control is executed to balance the gas by control opening SV2 while the compressor is off, in order to decrease the activation load in the next compressor- ON time.
  • Page 37 Outline of Control Outdoor Units Item Operation explanation and applied data, etc. Remarks 9. Compressor This control is to prevent stagnation of refrigerant in winding the compressor case by a supply of current to heat the heating control windings while the inverter compressor is off. This control is executed by the inverter outdoor unit only.
  • Page 38 Outline of Control Outdoor Units Item Operation explanation and applied data, etc. Remarks 11. IPDU (Inverter) IPDU controls the inverter compressor by command control frequency, frequency up/down speed, and current release control value from the interface P .C. board. The main controls of IPDU control P .C. board are described below.
  • Page 39 Outline of Control Outdoor Units Item Operation explanation and applied data, etc. Remarks 12. Defrost (1) Conditions for starting the defrost operation • If the conditions are satisfied, all the control 1) Calculate the operation time when the TE sensor outdoor units should (reverse detects below –...
  • Page 40 Outline of Control Outdoor Units Item Operation explanation and applied data, etc. Remarks 12. Defrost 3) For the slave outdoor units control • The compressors 1 and 2 are kept on. Should (reverse they be off they will be switched on. defrost •...
  • Page 41 Outline of Control Outdoor Units Other cautions (1) Cooling operation in low ambient temperature 1) When low pressure is reduced, the freeze prevention control by the indoor unit TC sensor may decrease the frequency. 2) When low pressure is reduced, the cooling capacity control may decrease the frequency. 3) When discharge temp.
  • Page 42 Outline of Control Indoor Units Item Operation explanation and applied data, etc. Remarks 1. Power source (1) Automatic remote controller function setup • Operation mode is reset Based upon the result of selecting indoor unit range Air volume model, setup and display range of the remote select/ Louver controller.
  • Page 43 Outline of Control Indoor Units Item Operation explanation and applied data, etc. Remarks 6. Air volume (1) By the command from the remote controller or the • During stop control central controller, “HIGH”, “MED.”, “LOW”, or operation, control to “AUTO” operation is permissible. prevent cold draft is determined by TC2.
  • Page 44 Outline of Control Indoor Units Item Operation explanation and applied data, etc. Remarks 11. Auto louver (1) When the louver signal has been received from the control remote controller or the central controller, the auto turn louver operates if the indoor fan is operating. 12.

  • Page 45: Self Diagnostic Display Information

    Self Diagnostic Display Information Outdoor Units System information data display (Displayed on the inverter unit only) The combination of rotary switches SW01, SW02 and SW03 display the following info: SW01, 02, 03: Rotary switch SW04, 05: Push switch SW08: Dip switch SW03 SW02 SW01 Displayed content Use refrigerant...
  • Page 46 Self Diagnostic Display Information Outdoor Units Outdoor unit information data display (Displayed on each outdoor unit) SW03 SW02 SW01 Displayed content Check code [U1] to [U5]: Outdoor unit number (1: Inverter) [– –]: Normal time (No error), a check code is displayed in abnormality. <SW04>...
  • Page 47 Self Diagnostic Display Information Outdoor Units (3) Outdoor cycle data display (Displayed on each outdoor unit) SW03 SW02 SW01 Displayed content Pd pressure sensor Pressure sensor data is displayed with (MPaG). Ps pressure sensor Temp. sensor data is displayed TD1 temp. sensor Symbol with (°C).
  • Page 48 Self Diagnostic Display Information Outdoor Units (5) Outdoor unit information data display (Displayed on inverter unit only) SW03 SW02 SW01 Displayed content 1 to 3 1 to 16 Indoor communication/ [01] to [48]: Indoor address number Receive status [ 1]: Receiving, [– –]: No connection Indoor check code [01] to [48]: Indoor address number [–...

  • Page 49: Control Circuit Configuration

    Control Circuit Configuration Indoor Units (1) LED display on indoor P .C. board – MCC-1361-01 General type Part No. Colour Displayed content Details Orange Serial receive Flashes synchronized with the receive signal to the standard remote controller. Green Serial send Flashes synchronized with the send signal from the standard remote controller.
  • Page 50 Control Circuit Configuration Indoor Units (2) Display on remote controller In the following conditions, “STANDBY” is displayed on the remote controller. 1) “STANDBY” display Fan operation is available, but PMV of the indoor unit is not permissible. (Refrigerant does not flow.) a.
  • Page 51 Control Circuit Configuration Indoor Units (4) Switch positions at shipment from the factory SW No. Function Description Position at shipment from factory SW01 Indoor unit No. Group operation control setup setup1: Master unit 2 to 16 Slave units SW02 Network Address setup by remote address setup controller is unavailable.
  • Page 52 Control Circuit Configuration Indoor Units (5) Contents of switch setup Network address setup table by DIP switch (SW02) • After turning off the power source, set 7 of DIP switch (SW02) to ON. Address setup from the remote controller becomes unavailable. Address DIP switch (SW02) Address...
  • Page 53 Control Circuit Configuration Indoor Units (6) Service P .C. board selection corresponded table MCC-1361-01 The indoor control P .C. board can correspond to multiple models. When replacing MCC-1361-01 P .C. board assembly, set DIP switch, rotary switch, and jumper according to the following description.

  • Page 54: Troubleshooting

    Troubleshooting Remote Controller Check Display Main Remote Controller Operating and Reading the Check Display Push the CHECK button, and the identification number of the faulty indoor unit is shown in the Temperature Setup section of the display – and the check code is shown in the TIME section of the display.
  • Page 55 Troubleshooting Remote Controller Check Display 7-Segment Display Hexadecimal notation Decimal notation Filter Data Example: A Filter signal is sent from No. 1 and No. 15 units under grouping operation. Check Data Unit No. Check code detected at first Check code detected at last Example: Room Temp.
  • Page 56 Troubleshooting Self Diagnostic Function Liquid crystal remote controller CHECK code STANDBY display Over capacity Abnormal phase connection Indoor drain overflow alarm Fixed Speed outdoor Inverter outdoor unit unit Remote Controller Inverter serial signal short circuit “04” – Remote (High level refrigerant leak if RBC-RD2-PE fitted) Remote controller serial signal circuit “99”...

  • Page 57: Diagnostic Procedure For Check Code

    Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Connection error of communication cable between inverter and interface P .C. boards [04] 2. Defective interface P .C. board Inverter communication alarm 3. Defective inverter P .C. board 4. Noise from outside 5.
  • Page 58 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Float switch disconnection [0b] 2. Drain pump operation error Indoor water overflow alarm 3. Drain hose blockage Check connection of connector CN11 Is drain pump connected? (Drain pump: Indoor main, P .C.
  • Page 59 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Fan motor circuit connection error [11] 2. Capacitor error Indoor fan motor alarm 3. Fan motor error 4. Defective indoor P .C. board Does indoor fan operate for a short period after resetting and resuming? Is there a connection error of CN18 connector?
  • Page 60 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit power source error [14] 2. Wiring error on inverter P .C. board G-Tr short circuit protective system 3. AC fuse disconnection alarm 4. Inverter compressor error (Gate Transistor) 5.
  • Page 61 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [17] 1. Defective wiring of inverter P .C. board Current detect circuit system alarm 2. Defective inverter P .C. board Is wiring connector on Modify connection of wiring inverter P .C. board normal? Check inverter P .C.
  • Page 62 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit power source error [1d] 2. Inverter compressor circuit system error Compressor alarm 3. Inverter compressor error 4. Inverter compressor refrigerant stagnation 5. Defective inverter P .C. board Is the power source voltage Confirm the power source supply.
  • Page 63 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit power source error [1F] 2. Inverter compressor circuit system error Compressor break down 3. Inverter P .C. board error Is the power source voltage Confirm the power source supply. of the outdoor unit normal? Does the voltage reduction occur when the fixed-speed...
  • Page 64 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Inverter high-pressure SW error 2. Inverter IOL (Inner Overload) operation 3. Service valve closed [21] 4. Outdoor fan, capacitor error Inverter high-pressure SW 5. Indoor/Outdoor PMV blockage system alarm 6.
  • Page 65 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Pd sensor error 2. Service valve closed 3. Outdoor fan, capacitor error [22] 4. Indoor/Outdoor PMV blockage High-pressure protective operation 5. Outdoor heat exchanger blockage 6. SV2 circuit blockage 7.
  • Page 66 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [87] Missing phase of outdoor unit power source Missing phase A Phase of the outdoor unit power source is missing. Modify the power source wiring. Check code Operation cause 1. No. of connected indoor units/connected over [89] capacity.
  • Page 67 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit system setup [8d] 2. Outdoor unit power source Reduction in the No. of 3. Connection error of communication cable between connected outdoor units outdoor units 4. Connection error of BUS communication 5.
  • Page 68 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [8F] 1. Address setup of outdoor unit was duplicated Duplicated terminal outdoor 2. Interface P .C. board error addresses Is SW09 bit 1 of master Turn off SW09 bit 1 on interface outdoor interface P .C.
  • Page 69 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Connection error of communication cable (PQ) [95] between indoor and outdoor units Communication alarm between 2. Connection error of connector for indoor indoor and outdoor communication, P .C. board error 3.
  • Page 70 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Connection error of communication cable (PQ) [96] between indoor and outdoor units Consistency detection of indoor 2. Abnormal No. of connected indoor units and outdoor addresses 3. Wiring connection error of central management remote controller Is the wiring connection to the communication cable...
  • Page 71 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Connection error of communication cable (PQ) between indoor and outdoor units 2. Connection error of (XY) for outdoor units [97] 3. Power source system error of the central controller BUS communication alarm (1) and indoor unit 4.
  • Page 72 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Miswiring of XY communication cables [98] 2. Duplicated network addresses BUS communication alarm (2) 3. Indoor P .C. board error, central controller error Is the wiring connection Check connection of wiring. of communication cables to X,Y normal? Is [98] displayed only...
  • Page 73 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Remote controller circuit connection error [99] 2. Duplicated indoor No.1 units Indoor remote controller 3. Remote controller error communication alarm 4. Indoor P .C. board error Are A, B, C internal Check connection of wiring.
  • Page 74 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Miswiring/Mispiping of indoor/outdoor units [9A] 2. Insufficient refrigerant Miswiring/Misconnection of indoor 3. Blockage in pipe run Was the outdoor unit stopped Stop the outdoor unit for for 20 minutes or more before 20 minutes or more, and then check miswiring again.
  • Page 75 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [A0] TD1 sensor open/short TD1 sensor alarm Open/short of TD1 sensor was detected. Check connector (TD1 sensor: CN502) and characteristics of sensor resistance value. When sensor is normal, replace interface P .C. board of the outdoor unit. Check code Operation cause [A1]...
  • Page 76 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit service valve closed 2. Cooling bypass PMV error [A6] 3. TD sensor error Discharge temperature TD1 alarm 4. Insufficient refrigerant, blockage in pipe 5. Blockage of PMV assembly on the liquid line Are the gas pipe and liquid Open valves fully.
  • Page 77 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit service valve closed [A7] 2. Blockage PMV assembly on the liquid line TS condition gas leak detection 3. TS sensor error 4. Insufficient refrigerant, blockage in pipe Are the gas pipe and liquid Open valves fully.
  • Page 78 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Connector misconnection of Pd/Ps sensors [Ab] 2. Pd/Ps sensor error Pressure sensor misconnection 3. Compressor inverse operation, compressor error Check connection. Is the pipe connection position of Pd sensor/Ps Pd sensor: CN501 sensor correct? Ps sensor: CN500...
  • Page 79 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit service valve closed 2. Cooling bypass PMV error [AE] 3. TD1 sensor error TD1 condition gas leak detection 4. Insufficient refrigerant, blockage in pipe 5. Blockage of indoor filter 6.
  • Page 80 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Ps sensor error [b4] 2. Ps sensor connection error Ps sensor alarm 3. Compressor error Check connection. Are Pd sensor/Ps sensor Pd sensor: CN501 correctly connected? Ps sensor: CN500 Are the output voltage characteristics of Ps sensor Sensor error...
  • Page 81 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Outdoor unit service valve closed 2. Cooling bypass PMV error [bb] 3. TD sensor error Discharge temperature TD2 alarm 4. Insufficient refrigerant, blockage in pipe 5. Blockage of PMV assembly on the liquid line Are the gas pipe and liquid Open valves fully.
  • Page 82 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Mg-SW contact deposit protective operation [bd] 2. TD sensor error Mg-SW protective operation 3. Pd sensor/Ps sensor error 4. Insufficient refrigerant, blockage in pipe Turn off the power supply, Is the Mg-SW contact faulty? and replace Mg-SW.
  • Page 83 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Ps sensor error 2. Service valve closed 3. Indoor fan capacitor error [bE] 4. Indoor/outdoor PMV blockage Low-pressure protective operation 5. Indoor heat exchanger blockage 6. SV2 circuit 7. Incorrect wiring of communication cable between indoor and outdoor units Are the following items related to indoor...
  • Page 84 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. No. of connected inverter outdoor units [d1] 2. Incorrect setup of master outdoor unit Master outdoor unit setup alarm 3. Defective outdoor interface P .C. board Are there multiple inverter Set only one inverter outdoor units connected? outdoor unit per system.
  • Page 85 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [d2] Defective slave outdoor unit Server outdoor alarm An error occurs in the slave outdoor unit. Confirm the check code of the slave unit, and check it according to the diagnostic procedure for each check code. Check code Operation cause [d3]...
  • Page 86 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Balancing pipe valve (all outdoor units in the connecting line) closed [d7] 2. Compressor case oil removal valve closed Protection of low oil level detection 3. Miswiring of TK1 sensor/TK2 sensor 4.
  • Page 87 Troubleshooting Diagnostic Procedure for Check Code ( *1) 2-way valve leakage/blockage check procedure 1. After resetting the power supply, start a trial operation. 7 segment display 2. Set SW01/SW02/SW03 on interface P .C. board to When operation has started "OL" "– –" 1/16/1, respectively.
  • Page 88 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. TK2 sensor out of place, miswiring, resistance [d9] value characteristics error TK2 temperature detection 2. Oil tank peripheral circuit error circuit alarm Check valve leakage Capillary blockage Strainer blockage Is TK2 sensor out of place? Modify sensor mounting.
  • Page 89 ( *1) Oil tank peripheral circuit leakage/blockage check procedure 1. After resetting the power supply, start a trial operation. 2. Set SW01/SW02/SW03 on interface P .C. board to 1/16/1, respectively. 3. Check the 7 segment display of the interface P .C. board. 7 segment display When operation has started "OL"...
  • Page 90 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Power supply failure 2. Outdoor fan error [dA] 3. Heat sink installation failure Abnormal overheat of heat sink 4. Blockage of heat sink cooling duct 5. Defective inverter P .C. board Check power supply.
  • Page 91 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [db] 1. Blockage in SV3C valve Oil level detection circuit 2. Blockage in SV3C valve circuit blockage detection Modify miswiring. Is there miswiring of TK1 sensor: CN516 TK1/TK2/TK3 sensor? TK2 sensor: CN515 TK3 sensor: CN507 Is the resistance value Sensor error.
  • Page 92 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [dC] 1. SV3C valve leakage Oil level detection circuit 2. TK1 sensor resistance value characteristics error leakage detection 3. Outdoor unit operation in high external temperatures Is the resistance value Sensor error.
  • Page 93 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Leakage of PMV assembly on the liquid line [dd] 2. Pd sensor/Ps sensor error Outdoor refrigerant leakage 3. Blockage in SV2 valve circuit detection 4. Blockage in SV3B valve circuit 5.
  • Page 94 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Indoor unit in automatic addressing mode [dE] 2. Indoor unit P .C. board setup error Indoor address undefined 3. Defective indoor unit P .C. board 4. Communication noise interference While this check code is displayed, wait for a moment.
  • Page 95 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Fixed-speed compressor high-pressure SW error 2. Fixed-speed compressor IOL operation [E1] 3. Service valve closed Fixed-speed high-pressure 4. Outdoor fan, capacitor error SW system alarm (1) 5. Indoor/Outdoor PMV blockage [F0] 6.
  • Page 96 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause 1. Inverter IOL operation 2. Service valve closed [E5] 3. Cooling bypass PMV error Inverter IOL operation 4. Miswiring of communication between indoor and outdoor units Is the IOL circuit normal? 1.Connector Repair IOL circuit.
  • Page 97 Troubleshooting Diagnostic Procedure for Check Code Check code Operation cause [E6] 1. Power supply error Fixed-speed IOL, 2. Fixed-speed compressor IOL operation OL system alarm (1) 3. Service valve closed [F1] 4. Blockage in indoor/outdoor PMV Fixed-speed IOL, 5. Miswiring of communication between indoor and OL system alarm (2) outdoor units [E6]: IOL operation circuit error compressor 1 side...
  • Page 98 Troubleshooting Diagnostic Procedure for Check Code Segment Display Function Outdoor unit 7 segment display (Interface P .C. board) A 7 segment LED to check the operation status is provided on the interface control P .C. board. The display contents can be selected by combining the setup numbers of the rotary switches (SW01, SW02, and SW03) on the P .C.
  • Page 99 Troubleshooting Description of Functional Parts Functional part Functional outline Solenoid 1. SV3A 1) Accumulates oil from the compressor to the oil tank when the valve is shut. valve (CN312) 2) Supplies the gathered oil to the balancing pipe during ON time when pressure is applied to inside of the oil tank.

  • Page 100: Backup Operation

    Backup Operation Emergency Operation When One Compressor has Failed (Backup Setup of Compressor) Outline When one of two compressors installed in the outdoor unit fails, take the following action if emergency operation by another normal compressor is possible. * NOTE 1: In the case of single compressor installed unit (6HP), backup operation by one compressor is unavailable.
  • Page 101 Backup Operation Emergency Operation Fault in fixed-speed unit (Backup of slave outdoor unit) Outline When a fixed-speed unit connected to the system fails, firstly perform emergency process according to the following work procedure, and then perform emergency operation on the inverter unit and other fixed-speed units.
  • Page 102 Backup Operation Emergency Operation Fault of inverter unit (Backup setup of Master outdoor unit) Outline When an inverter unit fails, firstly perform emergency process according to the following work procedure, and then perform emergency operation by a fixed-speed unit only. Work procedure (1) First, turn off the source power of all the outdoor units which are connected to the system.
  • Page 103 Backup Operation Emergency Operation Outdoor backup setup in cooling season (Simple setting method) Outline When either inverter unit or fixed-speed unit fails during cooling season, this function is used to perform emergency operation quickly. When the interface or electric circuit system fails, emergency operation by this setup cannot be performed.

  • Page 104: Forced Function Of Oil Level Detection

    Forced Function of Oil Level Detection Outdoor Unit The oil level detection control can be forcibly implemented by a switch on the interface P .C. board of the outdoor unit. When an error in the oil tank circuit occurs and there is no cause such as sensor error, connection error, sensor location error, valve close operation error, etc., perform the following checks.

  • Page 105: Refrigerant Pipe Installation

    Refrigerant Pipe Installation Leak Test [1] Leak test pressure For Multi Modular System air conditioner systems: 3.0MPa (30kg/cm [2] Test method Supply oxygen free nitrogen (OFN) gas to the system as described. • The gas-side, liquid-side and balance valves must all be fully closed. Note that there is a possibility that the nitrogen gas could become mixed into the outdoor unit cycle.
  • Page 106 Refrigerant Pipe Installation Vacuuming (1) After the airtight test, discharge nitrogen gas. Connect a gauge manifold to the service ports at liquid, gas and balance sides, and connect a vacuum pump as shown in the following figure. Be sure to perform vacuuming at liquid, gas, and balance sides. Low- High- pressure...
  • Page 107 Charging the System with Additional Refrigerant Calculating the Amount of Additional Refrigerant Required Refrigerant in the System When Shipped from the Factory Outdoor unit Model MM-A0224HT MM-A0280HT MM-A0160HX MM-A0224HX MM-A0280HX 15.5 17.0 Charging amount (kg) When the system is charged with refrigerant at the factory, the amount of refrigerant needed for the pipes at the site is not included.
  • Page 108 Refrigerant Pipe Installation Additional Refrigerant Charging Method (1) Loosely connect the refrigerant cylinder hose to the gauge manifold, then open the source valve V on the cylinder, purge the air in the hose, and then tighten the hose. (2) As shown in the diagram below, turn the refrigerant cylinder upside down, open the valve on the gauge manifold, and then charge the liquid side pipe with refrigerant in the liquid state.

  • Page 109: Additional Refrigerant Charging

    Refrigerant Pipe Installation Additional Refrigerant Charging Additional refrigerant charging amount reference chart Unit (kg) Actual Pipe size (Liquid pipe) Actual Pipe size (Liquid pipe) piping piping Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0 Ø22.2 Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0 Ø22.2 length (m) length (m) 0.030 0.065...

  • Page 110: Trial Operation

    Trial Operation Procedure and Summary of Trial Operation Outline of procedure For a trial operation, follow the procedure below. Check the basic items, especially installation work. Ensure you write the check results in the Check before trial operation check lists 1 and 2. Implement check in sequence according to Implementation of trial operation check each flowchart of trial operation procedure.
  • Page 111 Trial Operation Procedure and Summary of Trial Operation Trial operation check After “Check before trial operation”, implement a trial operation in the following procedure. (Turn the power switch on and the crank case heater for 12 hours before a trial operation will be completed.) Check the trial operation for each indoor unit.
  • Page 112 Trial Operation Procedure and Summary of Trial Operation (3) Cooling operation check Start This air conditioner is attached Trial operation from Set the operation mode to outdoor unit is with reactivation delay timer, so COOL by pushing the operation also available. the operation restarts switch for 5 seconds or more, 2 minutes 30 seconds after it...
  • Page 113 Trial Operation Procedure and Summary of Trial Operation NOTE 1: Criteria for indoor air inlet/outlet temperature difference After operation for a minimum of 30 minutes in “COOL” mode, if temp. difference between the air inlet and air outlet of the indoor unit is 8°C or more – operation is normal.
  • Page 114 Trial Operation Automatic Address Automatic address (Between outdoor unit and indoor unit) When turning the power on for the first time after the air conditioner has been installed, automatic address starts. Usually, the automatic address takes time approx. 3 to 5 minutes after the power is on. However, in some cases, it may take Max.

  • Page 115: Service Support Function

    Trial Operation Service Support Function Check function for connection of refrigerant pipe and control transmission line This function is provided to check misconnection of the refrigerant piping and the control transmission line between indoor and outdoor units by the switch on interface P .C.
  • Page 116 Trial Operation Service Support Function Function to start/stop (ON/OFF) indoor unit from outdoor unit A function to start/stop the following indoor units by switch operation on the interface P .C. board is provided. Function Outline Clear setup Trial cooling The modes of all the connected indoor units [Setup] operation are collectively changed to trial cooling Push SW04 for 2 seconds or more under...
  • Page 117 Trial Operation Service Support Function (1) Trial cooling operation function This function is to change the modes of all the indoor units connected to an identical system collectively to trial cooling operation modes using the switch on interface P .C. board of the inverter type outdoor unit.
  • Page 118 Trial Operation Service Support Function (2) Collective start/stop (ON/OFF) function This function is to start/stop (ON/OFF) the indoor units connected to an identical system collectively using the switch on the interface P .C. board of the inverter outdoor unit. Operation procedure Power ON If an alarm has been already displayed as SW01 1, SW02 1, SW03 1, return the status to normal...
  • Page 119 Trial Operation Service Support Function (3) Individual start/stop (ON/OFF) function This function is to start/stop (ON/OFF) the indoor units connected to an identical system individually using the switch on interface P .C. board of the inverter outdoor unit. Set SW01 to “16”, and SW02 and SW03 to the indoor unit to be operated. (See * in the following table) ¡...
  • Page 120 Trial Operation Service Support Function Alarm clear function 1) Clearing of check code on remote controller This function releases ALL STOP lock status of the outdoor units (whole system) connected with ¡ the indoor unit, and restarts the operation. ( Restarts alarm detection.) CHECK button...
  • Page 121 Trial Operation Service Support Function 3) Clearing of check code alarm by resetting power source Be sure to reset both power sources of outdoor/indoor units. ¡ Both power OFF Turn on power of the outdoor unit first, then indoor units. NOTE: Even if the lock alarm related to the indoor unit is cleared by resetting power source of the outdoor unit, ALL STOP lock status of whole system is not released.
  • Page 122 Trial Operation Service Support Function Pulse Motor Valve (PMV) manual "FULL OPEN" function in the indoor unit With switch operation on interface P .C. board of the inverter outdoor unit, this function allows manual opening of the Pulse Motor Valve (PMV) in all the indoor units for 2 minutes. Usually, turning on power of the indoor unit once fully closes the PMV of the indoor unit.

  • Page 123: Exploded Views And Service Parts

    Exploded Views and Service Parts Outdoor Units MM-A0280HT, MM-A0280HX, MM-A0224HT, MM-A0224HX...
  • Page 124 Exploded Views and Service Parts Outdoor Units MM-A0280HT, MM-A0224HT, MM-A0280HX, MM-A0224HX Ref No Part No Description MODEL (MM-A) 0280HT 0224HT 0280HX 0224HX 43A00020 PLATE-SIDE (Right) 43A00021 PLATE-SIDE (Left) 43A00022 AIR-IN-CABINET (Front) 43A00023 AIR-IN-CABINET (Back) 43A00024 CABINET-DOWN (Front) 43A00025 CABINET-DOWN (Back)
  • Page 125 Exploded Views and Serivce Parts Outdoor Units MM-A0160HX 28/29 45 26 35 34 33 12/13 14/15 16/17 24/25...
  • Page 126 Exploded Views and Serivce Parts Outdoor Units MM-A0160HX Model Name Part No. Description MM-A0160HX 43A00020 PLATE-SIDE (Right) 43A00021 PLATE-SIDE (Left) 43A00022 AIR-IN-CABINET Front) 43A00023 AIR-IN-CABINET (Back) 43A00024 CABINET-DOWN (Front) 43A00025 CABINET-DOWN (Back) 43A00026 SERVICE PANEL 43A00027 AIR-OUT-CABINET 43A20004 PROPELLER FAN – PY631 43A41513 COMPRESSOR –...
  • Page 127 Exploded Views and Service Parts Outdoor Unit Electrical Parts Assembly MM-A0280HT, MM-A0224HT 30/31 MM-A0280HX, MM-A0160HX MM-A0224HX...
  • Page 128 Exploded Views and Service Parts Outdoor Unit Electrical Parts Assembly MM-A0280HT, MM-A0224HT, MM-A0280HX, MM-A0224HX, MM-A0160HX Location Part No. Model Name (MM-A) Description 0280HT 0224HT 0280HX 0224HX 0160HX 43A50012 TEMPERATURE SENSOR – TS1 43A50013 TEMPERATURE SENSOR – TE 43A50014 TEMPERATURE SENSOR – TK3 43A52005 MAGNETIC CONTACTOR –...
  • Page 129 Exploded Views and Service Parts Indoor Units Built-In Duct – MM-B056, MM-B080, MM-B112, MM-B140 Part No Description Model Part No. Description Model 43120149 MULTI – FAN BLADE 43A60025 TERMINAL ' ABC PQ E' 43A21009 FAN MOTOR (SMF-230-60-4A) B056 43A60012 TERMINAL ' E - L - N ' 43121516 FAN MOTOR (STF-200-100-4B) B080...
  • Page 130 Exploded Views and Service Parts Indoor Units Built-In Slim Duct – MM-SB028 Part No. Description 43107215 SENSOR HOLDER (Spring Clip) 43A20003 FAN MULTI-BLADE 43A22005 S FAN CASE 43A22006 S FAN CASE 43A21020 FAN MOTOR 43A44063 REFRIGERATION ASSEMBLY 43A50023 SENSOR ROOM TEMPERATURE 43A50019 SENSOR –...
  • Page 131 Exploded Views and Service Parts Indoor Units 4-Way Cassette – MM-U056, MM-U080 Part No. Description Model Part No. Description Model 43A70005 DRAIN HOSE ASSEMBLY 43A50022 SENSOR - HEAT EXCHANGER (Liquid) 43A44066 REFRIGERATION ASSEMBLY U056 43A50023 SENSOR ROOM TEMPERATURE 43A44067 REFRIGERATION ASSEMBLY U080 43A49009 PRESSURE SENSOR (Service)
  • Page 132 Exploded Views and Service Parts Indoor Units 4-Way Cassette – MM-U112, MM-U140 Part No. Description Model Part No. Description Model 43A70005 DRAIN HOSE ASSEMBLY 43A50022 SENSOR – HEAT EXCHANGER (Liquid) 43A44064 REFRIGERATION ASSEMBLY U112 43A50023 SENSOR ROOM TEMPERATURE 43A44065 REFRIGERATION ASSEMBLY U140 43A49009 PRESSURE SENSOR (Service)

  • Page 133: Additional Literature And Contacts

    Additional Literature and Contacts...
  • Page 134 Additional Literature and Contacts...
  • Page 135 TOSHIBA AIR CONDITIONING www.toshiba-aircon.co.uk MADE IN UK A90-0130 Revised April 2001...

This manual is also suitable for:

Mm-a0224hxMm-a0224htMm-a0160hxMm-a0280hx

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