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Toshiba MMW-AP0481CHQ-E Service Manual

Hot water module high temperature type
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FILE No. A10-1821
AIR CONDITIONER (MULTI TYPE)
SERVICE MANUAL
Hot Water Module
High temperature type
Model name:
MMW-AP0481CHQ-E
MMW-AP0481CHQ-TR
Aug
PRINTED IN JAPAN,
., 2018 , TOMO

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Summary of Contents for Toshiba MMW-AP0481CHQ-E

  • Page 1 FILE No. A10-1821 AIR CONDITIONER (MULTI TYPE) SERVICE MANUAL Hot Water Module High temperature type Model name: MMW-AP0481CHQ-E MMW-AP0481CHQ-TR PRINTED IN JAPAN, ., 2018 , TOMO...

  • Page 2: Table Of Contents

    CONTENTS 1. SUMMARIES OF PRODUCT CHARACTERISTICS ..........12 2. SPECIFICATIONS ....................13 3. WIRING DIAGRAM ....................15 4. PARTS RATING ...................... 16 5. REFRIGERANT CYCLE DIAGRAM ............... 17 6. CONTROL OUTLINE ....................18 7. APPLIED CONTROL AND FUNCTIONS ............... 20 7-1.
  • Page 3 (including the hot water modules) made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such matters by an individual or individuals who have been trained and is thus thoroughly acquainted with the knowledge related to this work.
  • 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 hot water module WARNING WARNING ELECTRICAL SHOCK HAZARD ELECTRICAL SHOCK HAZARD Disconnect all remote Disconnect all remote electric power electric power supplies supplies before servicing. before servicing. CAUTION CAUTION High temperature parts. High temperature parts. You might get burned when removing You might get burned this panel.
  • Page 6 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 hot water module, Flow selector unit and outdoor units to the OFF position.
  • Page 7 WARNING Before starting to repair the hot water module, read carefully through the Service Manual, and repair the hot water module by following its instructions. Only qualified service person (*1) is allowed to repair the hot water module. Repair of the hot water module by unqualified person may give rise to a fire, electric shocks, injury, water leaks and / or other problems.
  • Page 8 Connect the cut-off lead wires with crimp contact, etc., put the closed end side upward and then apply a water cut method, otherwise a leak or production of fire is caused at the user's side. Insulating measures When performing repairs using a gas burner, replace the refrigerant with nitrogen gas because the oil that coats the pipes may otherwise burn.
  • Page 9 When the refrigerant gas leaks, find up the leaked position and repair it surely. If the leaked position cannot be found up and the repair work is interrupted, pump-down and tighten the service valve, otherwise the refrigerant gas may leak into the room. The poisonous gas generates when gas touches to fire such as fan heater, stove or cooking stove though the refrigerant gas itself is innocuous.
  • Page 10 Only a qualified installer (*1) or qualified service person (*1) is allowed to install the hot water module. If the hot water module is installed by an unqualified individual, a fire, electric shocks, injury, water leakage, noise and / or vibration may result.
  • Page 11 Weight (kg) Main unit Heating MMW-AP0481CHQ-E MMW-AP0481CHQ-TR * Under 70 dB(A) Declaration of Incorporation of Partly Completed Machinery Manufacturer: Toshiba Carrier Corporation 336 Tadehara, Fuji-shi, Shizuoka-ken 416-8521 JAPAN Representative/ TOSHIBA CARRIER TCF holder: EUROPE S.A.S Route de Thil 01120 Montluel FRANCE...

  • Page 12: Summaries Of Product Characteristics

    1. SUMMARIES OF PRODUCT CHARACTERISTICS CONCEPT • To design and produce a high temperature hot water module, capable of producing up to 82°C outlet water temperature, whilst maximizing the performance and efficiency of the entire VRF system. • To be used in both space heating and domestic hot water applications. Typical applications include hotel, office and residential apartment suits.

  • Page 13: Specifications

    2. SPECIFICATIONS Model MMW-AP0481CHQ-E y t i i t s Appearance Zinc hot dipping steel plate Depth (leg include) (mm) 320 (400) Width (mm) 1,035 Design Pressure Refrigerant (R410A) side (MPa) 3.73 Refrigerant (R134a) side (MPa) 4.15 l a i...
  • Page 14 Model MMW-AP0481CHQ-TR y t i i t s Appearance Zinc hot dipping steel plate Depth (leg include) (mm) 320 (400) Width (mm) 1,035 Design Pressure Refrigerant (R410A) side (MPa) 3.73 Refrigerant (R134a) side (MPa) 4.15 l a i l l o l l o indoor Operation range...

  • Page 15: Wiring Diagram

    3. WIRING DIAGRAM – 15 –...

  • Page 16: Parts Rating

    4. PARTS RATING MMW-AP0481CHQ Specifications 1 Compressor DW422A3F-10M R134a Output: 1.5kW 2 High pressure SW ACB-1UB117W OFF 3.95MPa, ON 3.1MPa Compressor US-622KXTMQO-SS OFF 125˚C, ON 90˚C case thermostat Pulse motor EFM-MD12TF-3 DC12V (PMV1, R410A cycle) Pulse motor EFM-MD12TF-4 DC12V (PMV2, R134a cycle) —...

  • Page 17: Refrigerant Cycle Diagram

    5. REFRIGERANT CYCLE DIAGRAM Model: MMW-AP0481CHQ-E (TR) High-pressure Low-pressure sensor (PD) sensor (PS) Gas side Water R410A Outlet (TWO) High-pressure switch (63H) PLATE TYPE PLATE TYPE HEAT EXCHANGER HEAT EXCHANGER Water and R134a R410A and R134a Accumulator Flow SW Compressor...

  • Page 18: Control Outline

    6. CONTROL OUTLINE Item Specifications 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. If power supply reset is performed in the wake of a trouble, the check code is cleared. If the abnormality persists after the Start / Stop button on the remote controller is pushed to resume operation, the check code is redisplayed on the remote controller.
  • Page 19 Item Specifications Remarks Water As the following description, the pump and the line heater are controlled based on the TC1: Gas Temperature Heat exchanger detected temperature of TC1 sensor, TCJ sensor, TC2 (TWO) sensor, TE sensor, TD TCJ: Liquid frost prevention sensor and TA (TWI) sensor, regardless of Start/Stop operation.

  • Page 20: Applied Control And Functions

    7. APPLIED CONTROL AND FUNCTIONS 7-1. Print circuit board Control print circuit board MCC-1643 – 20 –...
  • Page 21 I/F print circuit board MCC-1628 – 21 –...
  • Page 22 IPDU print circuit board MCC-1705 – 22 –...

  • Page 23: Optional Connector Specifications Of Hot Water Module P.c. Board

    7-2. Optional connector specifications of hot water module P.C. board Function Terminal Pin No. Specifications Remarks Start/stop input for HA (J01:In place/ Removed = Pulse Start/stop input input (factory default) / Step input) 0V (COM) — Remote controller Enables / disables start / stop control via remote MCC-1643 disabling input controller...

  • Page 24: Method To Set Hot Water Module Function Dn Code

    7-4. Method to set hot water module function DN code (When performing this task, be sure to use a wired remote controller.) <Procedure> To be performed only when system at rest Push the buttons simultaneously and hold for at least 4 seconds. The unit No.

  • Page 25: Applied Control Of Indoor Unit (Including Hot Water Module)

    7-5. Applied control of indoor unit (including Hot Water Module) 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...
  • Page 26 <Line (system) address> 12 12 12 12 12 Push the TEMP. buttons repeatedly to set the CODE No. to Push the TIME buttons repeatedly to set a system address. (Match the address with the address on the interface P.C. board of the header outdoor unit in the same refrigerant line.) Push button.
  • Page 27 Confirming the indoor unit addresses and the position of an indoor unit using the remote controller Confirming the numbers and positions of indoor units To see the indoor unit address of an indoor unit which you know the position of When the unit is individual (the indoor unit is paired with a wired remote controller one-to- one), or it is a group-controlled one.
  • Page 28 To find an indoor unit’s position from its address When checking unit numbers controlled as a group (Execute it while the units are stopped.) The indoor unit numbers in a group are indicated one after another. The fan and louvers of the indicated units are activated.
  • Page 29 To check all the indoor unit addresses using an arbitrary wired remote controller. (When communication wirings of 2 or more refrigerant lines are interconnected for central control) CODE NO. TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT FILTER RESET TEST SWING/FIX...
  • Page 30 Changing the indoor unit address using a remote controller To change an indoor unit address using a wired remote controller. The method to change the address of an individual indoor unit (the indoor unit is paired with a wired remote controller one-to-one), or an indoor unit in a group. (The method is available when the addresses have already been set automatically.) Finish (Execute it while the units are stopped.)
  • Page 31 To change all the indoor unit addresses using an arbitrary wired remote controller. (The method is available when the addresses have already been set automatically.) (When communication wirings of 2 or more refrigerant lines are interconnected for central control) NOTE You can change the addresses of indoor units in each refrigerant line using an arbitrary wired remote controller.
  • Page 32 CODE NO. TEMP. ON / OFF TIMER SET MODE TIME SAVE VENT FILTER RESET TEST SWING/FIX UNIT LOUVER Finish 5, 7 Press to finish setting Push the TIME buttons repeatedly to change the value of the indoor unit address in SET DATA.
  • Page 33 Check code clearing function How to clear the check code using the wired remote controller Clearing a check code of the outdoor unit Clear the currently detected outdoor unit for each refrigerant line to which the HWM controlled by the remote controller is connected. (The HWM trouble is not cleared.) Use the service monitoring function of the remote controller.
  • Page 34 Monitoring function of wired remote controller The following monitoring function is available if the remote controller RBC-AMT32E is used. 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. Push and hold the , and for 4 seconds or longer to enter the service monitoring mode.
  • Page 35 Outdoor unit Display Remote controller display example format l n i × Water inlet temperature (TA (TWI)) × × [0024]=24 Water outlet temperature (TC2 (TWO)) × × [0150]=1500pls × × [0150]=1500pls × Compressor discharge temperature (TD) R134a ×1 [0024]=24 Plate type heat exchanger temperature (TE) R134a ×1 ×...
  • Page 36 LED display of circuit board 1.D02 (Red) • Lights up when the power is turned on (Microprocessor works) • Blinks at 1-second intervals (0.5-second): No EEPROM, or writing trouble • Blinks at 10-second intervals (5-second): No DISP mode • Blinks at 2-second intervals (1-second): Function change being set (EEPROM) 2.D203 (Red): Remote controller communication •...

  • Page 37: Test Operation Check

    7-6. Test operation check Test operation START Push the ON/OFF button on the remote controller connecting to H-HWM to start operation of Test operation for one Hot water module H-HWM and then set the setting temperature on the remote controller to 82 ˚C The operation does not start for approximately 3 minutes after Operation starts...
  • Page 38 Note 1: Criteria for the difference between suction and discharge temperatures, between water inlet and water outlet temperature (1) Heating operation After operating for a minimum of 30 minutes in “HEAT” mode, if the ΔT water temperature difference between water inlet and water outlet of the hot water module is 3 to 5 degrees, it is normal. (Hot water module) * If demand from the indoor unit on the outdoor unit is low because the difference between the temperature set by the remote controller and the temperature of the room or the difference between the temperature...

  • Page 39: Troubleshooting

    8. TROUBLESHOOTING 8-1. Overview (1) Before engaging in troubleshooting (a) Applicable models Super Heat Recovery Multi (SHRM-e) models. (Indoor units: MMW-APOOO, Outdoor units: MMY-MAPOOOO*) (b) Tools and measuring devices required • Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc. •...
  • Page 40 (3) When water does not warm up. Check code is not indicated on the remote Follow the check items in check controller. code. Check the following value in operation UC = TG – TCJ 55°C and UC ≥ 30 K Check at the R410A side.
  • Page 41 Is outdoor unit ambient temperature within the use temperature range? Install the outdoor unit in a place -25°CDB ~ 40°CDB within the use temperature range. -25°CWB ~ 28°CWB Is H-HWM TC1 temperature H-HWM cascade heat exchanger less than room temperature + 5°C? trouble Is discharge gas pipe temperature of FS unit = Flow selector unit...

  • Page 42: Troubleshooting Method

    8-2. Troubleshooting method The remote controllers (main remote controller) and the interface P.C. board of an outdoor unit are provided with an LCD display (remote controller) or 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 43 List of check codes (Hot Water Module) (Trouble detected by Hot Water Module) Check code Outdoor 7-segment display Main Typical trouble site Description of trouble remote Check Sub-code controller code A01 Detected indoor nuit No. Flow switch operation trouble When water flow rate is reduced. Water temperature decrease Water temperature continued the low status regardless of that the A02 Detected indoor unit No.
  • Page 44 (Trouble detected by main remote controller) Indoor unit (including Hot Water Module) Check code Outdoor 7-segment display Main Typical trouble site Description of trouble remote Sub-code controller No master remote controller, Signals cannot be received from indoor unit; master remote —...
  • Page 45 List of Check Codes (Outdoor Unit) (Check code detected by SHRM-e 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 46 Check code Display of receiving unit Outdoor 7-segment display TCC-LINK Indicator light block central control Typical problem site Description of check code or main remote Operation Timer Ready Sub-code Flash controller display Outdoor suction 01: TS1 Outdoor suction temperature sensor temperature 02: TS2 (TS1,TS2) has been open/short-circuited.
  • Page 47 Check code Display of receiving unit Outdoor 7-segment display TCC-LINK Indicator light block central control Typical problem site Description of check code or main remote Operation Timer Ready Sub-code controller Flash display A3-IPDU Fan-IPDU A3-IPDU Fan-IPDU Trouble in number There are insufficient number of IPDUs (P.C. of IPDUs.
  • Page 48 (Check code detected by IPDU featuring in SHRM-e standard outdoor unit - typical examples) Check code Display of receiving unit Outdoor 7-segment display Indicator light block TCC-LINK central control Typical problem site Description of check code or main remote Operation Timer Ready Sub-code Flash controller...

  • Page 49: Troubleshooting Based On Information Displayed On Remote Controller

    8-3. Troubleshooting based on information displayed on remote controller Using main remote controller (RBC-AMT32E) (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 50: Check Codes Displayed On Remote Controller And Shrm-E Outdoor Unit (7-Segment Display On I/F Board) And Locations To Be Checked

    8-4. Check Codes Displayed on Remote Controller and SHRM-e Outdoor Unit (7-Segment Display on I/F Board) and Locations to Be Checked Check code Location Check code detection Outdoor 7-segment display Description System status Check items (locations) Main condition(s) remote detection Check controller Sub-code...
  • Page 51 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote detection Check controller Sub-code code Indoor unit Heat sink Stop of IGBT built-in temp sensor • Check power voltage (H-HWM) overheat trouble corresponding (TH) is overheated.
  • Page 52 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code Indoor unit High-pressure Stop of PD sensor detect • Check PD pressure sensor trouble. (H-HWM) protective corresponding pressuere is higher than •...
  • Page 53 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code Indoor unit Indoor units(s) Stop of There is no • Check order in which power was -FS unit(s) corresponding communication from turned on.
  • Page 54 Check code Location Check code detection Outdoor 7-segment display Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code IPDU All stop Communication is • Check wiring and connectors A3-IPDU Fan-IPDU communication disrupted between involved in communication trouble IPDUs (P.C.
  • Page 55 Check code Location Check code detection Outdoor 7-segment display Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code 01: TS1 sersor trouble TS1/TS2 sensor All stop Sensor resistance is • Check connection of TS1/TS2 02: TS2 sersor trouble trouble infinity or zero (open/ sensor connector...
  • Page 56 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code 01: Compressor 1 side IPDU Compressor All stop Inverter current detection • Check power supply voltage. 02: Compressor 2 side breakdown circuit detects overcurrent (AC380-415V ±...
  • Page 57 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code 01: TK1 sensor trouble Trouble in All stop Sensor resistance is • Check connection of TK1 sensor 02: TK2 sensor trouble temperature infinity or zero (open/...
  • Page 58 Check code Location Check code detection Outdoor 7-segment display Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code 01: TK1 oil circuit trouble Oil level detection All stop No temperature change • Check for disconnection of TK1 02: TK2 oil circuit trouble circuit trouble is detected by TK1...
  • Page 59 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote detection Check controller Sub-code code Duplicated All stop More than one indoor • Check display on priority indoor priority indoor units have been set up unit.
  • Page 60 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code Trouble in No. All stop Insufficient number of • Check model setting of P.C. board A3-IPDU Fan-IPDU of IPDUs IPDUs are detected when for servicing outdoor I/F P.C.
  • Page 61 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote detection Check controller Sub-code code 01: Compressor 1 side IPDU Activation of high- All stop High-pressure SW is • Check connection of high pressure 02: Compressor 2 side pressure SW activated.
  • Page 62 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote detection Check controller Sub-code code Outdoor liquid All stop <During cooling operation> • Check full-close operation of backflow When system is in outdoor PMV (1, 4).
  • Page 63 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote Check detection controller Sub-code code Activation of All stop <During cooling operation> • Check for trouble in PD pressure high-pressure PD sensor detects sensor.
  • Page 64 Check code Location Outdoor 7-segment display Check code detection Description System status Check items (locations) Main condition(s) remote detection Check controller Sub-code code 01: Compressor 1 side IPDU IPM shortcircuit All stop Overcurrent is • Check connector connection and 02: Compressor 2 side protection trouble momentarily detected wiring on A3-IPDU P.C.

  • Page 65: Diagnostic Procedure For Each Check Code (Hot Water Module)

    8-5. Diagnostic Procedure for Each Check Code (Hot water module) Check code Check code name Cause Flow switch operation Flow switch trouble (H-HWM) Water pump trouble Clogging of water pipe [A01] H-HWM control P.C. board trouble H-HWM I/F P.C. board trouble Check and correct Dose flow SW Is circuit wiring...
  • Page 66 Check code Check code name Cause Water temperature decrease Water heater trouble trouble H-HWM I/F P.C. board trouble [A02] (H-HWM) TWI (TA) sensor trouble TWO (TC2) sensor trouble Check setting of DN code 61 Is the water Heater connection: 1 heater connected ? No heater connection: Are characteristics of...
  • Page 67 Cause Check code Check code name Activation of water heat H-HWM ambient temperature decrease exchanger frost H-HWM control P.C. board trouble [A04] protection TWI (TA) sensor trouble (H-HWM) TWO (TC2) sensor trouble Are characteristics Replace TWI (TA) or of TWI (TA) and TWO (TC2) sensor resistance TWO (TC2) sensor.
  • Page 68 Cause Check code Check code name Activation of water High- External water heater trouble temperature protection H-HWM control P.C. board trouble [A05] (H-HWM) TWI (TA) sensor trouble TWO (TC2) sensor trouble Is there any water heater connected with H-HWM ? Is there the water heater which is not connected with H-...
  • Page 69 Cause Check code Check code name Activation of low- H-HWM I/F P.C. board trouble H-HWM PMV2 trouble pressure protection H-HWM high-pressure (PD) sensor trouble H-HWM PMV1 trouble [A06] (H-HWM) H-HWM low-pressure (PS) sensor trouble Cascade heat exchanger clogging R134a refrigerant shortage R410A refrigerant pipe clogging or deformed Are characteristics of low-pressure (PS)
  • Page 70 Cause Check code Check code name PMV2 trouble H-HWM TS sensor trouble (H-HWM) H-HWM low-pressure (PS) sensor trouble H-HWM PMV2 trouble [A07] H-HWM I/F P.C. board trouble Cascade heat exchanger clogging Are characteristics of low-pressure Exchange low-pressure (PS) sensor (PS) sensor. normal ? Are characteristics Exchange TS sensor.
  • Page 71 Cause Check code Check code name Reversal of inlet water H-HWM TWI (TA) sensor trouble H-HWM TWI sensor and TWO temperature and outlet water H-HWM TWO (TC2) sensor trouble sensor are exchanged [A08] temperature H-HWM control P.C. board trouble (H-HWM) Reversal of inlet water connection and outlet water connection Are connections of...
  • Page 72 Cause Check code Check code name Mixed refrigerant H-HWM TE sensor trouble H-HWM cascade heat exchanger trouble (H-HWM) H-HWM low-pressure (PS) sensor trouble [A09] H-HWM I/F P.C. board trouble Mixed refrigerant (R134a, R410A) Are characteristics of Exchange TE sensor. TE sensor normal ? Are characteristics of Exchange low-pressure low-pressure (PS)
  • Page 73 Check code Check code name Cause TD/TE/TS sensor H-HWM TD sensor trouble trouble H-HWM TE sensor trouble [A10] (H-HWM) H-HWM TS sensor trouble H-HWM I/F P.C. board trouble Is TD sensor connector on H-HWM Correct connection of I/F P.C. board connector.
  • Page 74 Cause Check code Check code name TD/TE/TS sensor miswiring H-HWM I/F P.C. board trouble (H-HWM) TD/TE/TS sensor miswiring [A11] Are connection of TD sensor and TE sensor Correct connection of and TS sensor connectors. connectors correct ? Are installed positions Correct installed of TD sensor and positions of TD sensor...
  • Page 75 Check code Check code name Cause Pressure sensor trouble (PD, PS) H-HWM I/F P.C. board trouble [A12] (H-HWM) H-HWM high-pressure (PD) sensor trouble H-HWM low-pressure (PS) sensor trouble Are connection of high-pressure (PD) Correct connection of sensor and connectors. low-pressure (PS) sensor connectors correct ? Are output voltage...
  • Page 76 Short circuit protection trouble of 1. IPDU trouble / Wire connection trouble compressor drive device of H-HWM [A15] 3. IPDU P.C. board trouble of H-HWM Are connections of compressor lead and reactor correct? Correct wiring. (Check referring to the Wiring diagram.) Does the same trouble occur Replace IPDU...
  • Page 77 Current detective circuit system 1. Wiring or connector connection trouble trouble (H-HWM) on IPDU P.C. board of H-HWM [A16] 2. IPDU P.C. board trouble of H-HWM Wiring or connector connection on Correct connector IPDU P.C. board of H-HWM connection or wiring. normal? Check IPDU P.C.
  • Page 78 Compressor trouble (Lock) 1. H-HWM power line trouble 3. Compressor trouble [A17] 4. Refrigerant stagnation in compressor shell 5. IPDU P.C. board trouble 6. TE, TS, PMV 2 trouble Is power supply voltage of H- HWM normal? Correct power supply line. AC198 to 264V Is wire connection correct? Compressor lead...
  • Page 79 Compressor breakdown 1. H-HWM power line trouble Conduction in rotor-stop has 2. Compressor circuit system trouble [A18] occurred (H-HWM) 3. Compressor trouble 4. Abnormal overload in operation 5. IPDU P.C. board of H-HWM trouble Is power supply voltage of H- HWM normal? Correct power supply line.
  • Page 80 Compressor position detective 1. Wire/connector connection trouble circuit trouble (H-HWM) 2. Compressor trouble [A19] 3. IPDU P.C. board of H-HWM trouble Check and correct circuit Are connector connection and wiring normal? cables such as wiring to compressor, etc. Compressor trouble Is the unit grounded? →...
  • Page 81 Power failure detected, Power failure of the power supply to H-HWM abnormal inverter DC voltage [A21] (on compressor) (H-HWM) Check the same items as [A23] trouble. Does the supply voltage of Confirmation of H-HWM drop or rise electrical work etc. (AC198 to 264V)? Check IPDU P.C.
  • Page 82 Cause Check code Check code name High-pressure SW system PMV2 trouble trouble H-HWM I/F P.C. board trouble (H-HWM) H-HWM high-pressure (PD) sensor trouble [A23] Water heat exchanger trouble Water heat exchanger trouble Note) High-pressure SW is normally closed.(B contact) Dose high Is circuit cabling Replace TWI (TA) or pressure SW...
  • Page 83 TH sensor trouble Compressor drive device built-in sensor trouble [A24] This trouble code means compressor drive device built-in temperature sensor trouble. Check IPDU P.C. board of H-HWM Failure → Replace – 83 –...
  • Page 84 Check code Check code name Cause Discharge temperature TD PMV2 trouble trouble H-HWM I/F P.C. board trouble [A25] (H-HWM) H-HWM TD sensor trouble Is H-HWM PMV2 normal ? 1. Connector connection Repair H-HWM PMV2. 2. Wiring 3. Coil 4. Valve body 5.
  • Page 85 Cause Check code Check code name Gas leak detection (R134a) PMV2 trouble R134a gas leak trouble (H-HWM) H-HWM I/F P.C. board trouble [A26] H-HWM TD sensor trouble H-HWM low-pressure (PS) sensor trouble H-HWM TS sensor trouble Is H-HWM PMV2 normal ? 1.
  • Page 86 Cause Check code Check code name High-pressure protective PMV2 trouble operation H-HWM I/F P.C. board trouble [A27] (H-HWM) H-HWM high-pressure (PD) sensor trouble Water heat exchanger trouble Is H-HWM PMV2 normal ? 1. Connector connection Repair H-HWM PMV2. 2. Wiring 3.
  • Page 87 Communication trouble between 1. Communication trouble between I/F and IPDU P.C. boards I/F and IPDU P.C. boards of H-HWM [A28] I/F, IPDU P.C. boards of H-HWM trouble Is communication connector between I/F Correct connection of and IPDU P.C. boards connector. connected? Replace I/F P.C.
  • Page 88 I/F P.C. board trouble 1. H-HWM power trouble (Voltage, noise, etc.) [A31] Check power voltage and Is there any trouble line. of H-HWM power supply? Correct power line. Check external noise, etc. Check I/F P.C. board of H-HWM. Failure → Replace. Indoor other trouble Indoor P.C.
  • Page 89 Communication trouble between 1. Communication trouble between I/F and control P.C. boards I/F and control P.C. boards of H-HWM [L29] I/F, control P.C. boards of H-HWM trouble Is communication connector between I/F Correct connection of and control P.C. boards connector. connected? Replace I/F P.C.

  • Page 90: Sensor Characteristics

    8-6. Sensor characteristics Temperature sensor characteristics TC1 sensor Temperature [˚C] -20 -10 90 100 Temperature [˚C] Temperature [˚C] TA (TWI), TC2 (TWO) and TD sensor -20 -10 90 100 Temperature [˚C] Temperature [˚C] TCJ and TS sensor Temperature [˚C] – 90 –...
  • Page 91 Pressure sensor characteristics • Input/output wiring summary High pressure side (PD) / Low pressure side (PS) Pin No. Input/output name Lead wire color OUTPUT White — — Black • Output voltage vs. pressure High pressure side (PD) / Low pressure side (PS) 0.5~4.3V 0~3.73MPa 3.73...
  • Page 92 Pressure Sensor Output Check PD/PS sensor characteristics 0 to 4.41 MPa (0.5 to 5V output for 0 to 4.41 MPa) Voltage readings across pins 1 and 3 of CN606 (PD: Black) / CN605 (PS: Yellow) on H-HWM Control P.C. board (MCC-1643) (with negative-side probe of multimeter placed on pin 3) VOLT VOLT VOLT...

  • Page 93: Board Exchange Procedures

    9. P.C. BOARD EXCHANGE PROCEDURES Replacement of control P.C. boards Part code Model type P.C. board type 431-6V-673 MMW-AP0481CHQ series MCC-1643 Points to note when replacing control P.C. board assembly The electrically erasable programmable read-only memory (hereinafter EEPROM, IC503) mounted on a P.C. board holds important setting data, including the type and capacity codes intrinsic to the model (set at the factory), as well as the line / indoor (including hot water module) / group addresses, and the like (during installation, either automatically or manually).
  • Page 94 Procedure 1: reading setting data from EEPROM (Read the setting data from EEPROM, including both the factory settings and any modifications made to them on site.) Push the buttons simultaneously and hold for at least 4 seconds. * In the case of group control, the unit No. displayed first is the indoor unit (including Hot Water Module) No.
  • Page 95 Procedure 2: replacing P.C. board Replace the trouble P.C. board with a service P.C. board. Be sure to replicate the old jumper setting (removal) on the service P.C. board. (See the diagram at below.) SW501 It is necessary to establish a one-to-one correspondence between the hot water module being serviced and the remote controller.
  • Page 96 Procedure 3: writing setting data in EEPROM (The EEPROM of the service control P.C. board has been set to the factory trouble values.) Push the buttons simultaneously and hold for at least 4 seconds. (Under UNIT No., is displayed.) At the same time, the CODE No. (DN code) is displayed.
  • Page 97 CODE No. list (Example) CODE No. (DN) Item Setting data Factory-set value Central control address 0099: Unfixed Type Depending on model type H-HWM capacity Depending on capacity type System address 0099: Unfixed H-HWM address 0099: Unfixed Group address 0099: Unfixed Power failure automatic recovery 0000: None Timer setting (wired remote controller)

  • Page 98: Detachments

    10. DETACHMENTS WARNING CAUTION Stop the air conditioner(including HWM) operation, Wear a pair of gloves. Otherwise, you will risk an injury. and turn off the circuit breaker. Part to be replaced Work procedure Remarks Part to be replaced 1. Detachment Top plate •...
  • Page 99 Part to be replaced Work procedure Remarks Electric parts box 1. Detachment Electric parts box cover upper side cover 1) Carry out the detachment of item 1 . 2) Remove the screws at the lower side of the electric parts box cover. (M4 ×...
  • Page 100 Part to be replaced Work procedure Remarks Control P.C. Board 1. Detachment Control P.C. Board (MCC-1643) (MCC-1643) 1) Carry out the detachment of item 1 . 2) Carry out the detachment of item 3 . 3) Remove the connectors connected from Control P.C.
  • Page 101 Part to be replaced Work procedure Remarks Electric parts box 1. Detachment Clamp for Comp lead relay 1) Carry out the detachment of item 1 . reactor lead connector 2) Carry out the detachment of item 3 . 3) Remove the bundled lead wires from clamps (two places).
  • Page 102 Part to be replaced Work procedure Remarks IPDU P.C. Board 1. Detachment (MCC-1705) 1) Carry out the detachment of item 1 . IPDU P.C. Board (MCC-1705) 2) Carry out the detachment of item 3 . 3) Carry out the detachment of item 6 . 4) Remove the screws for the IPDU box cover.
  • Page 103 Part to be replaced Work procedure Remarks Cooling fan assembly 1. Detachment 1) Carry out the detachment of item 1 and 2 . 2) Remove a vinyl tube from a clamp. 3) Remove the relay connector (3P:Red) for fan motor. 4) Remove the screws for duct cover.
  • Page 104 Part to be replaced Work procedure Remarks Flow switch 1. Detachment 1) Close the water supply source valve. 2) Carry out the detachment of item 1 . 3) Remove a vinyl tube from a clamp. 4) Remove the relay connector (2P:White) for flow switch.
  • Page 105 Part to be replaced Work procedure Remarks Heat exchanger 1. Detachment assembly 1) Carry out the detachment of item 1 and 2 . Check joint (Water - Refrigerant) 2) Recover R134a gas from check joint. (Low pressure side) 3) Remove the pipe connected to connection port for refrigerant pipe.
  • Page 106 Part to be replaced Work procedure Remarks Heat exchanger 1. Detachment assembly 1) Carry out the detachment of item 1 and 2 . (Refrigerant- 2) Recover R134a refrigerant from check joint. Check joint (Low pressure side) Refrigerant) 3) Remove the pipe connected to the connection port for the refrigerant.
  • Page 107 Part to be replaced Work procedure Remarks Compressor 1. Detachment Check joint Check joint 1) Carry out the detachment of item 1 . (Low pressure (High pressure side) 2) Recover R134a refrigerant from check joint. side) 3) Remove the parts around compressor. 4) Remove the terminal cover for compressor and remove the compressor lead wire and Compressor thermostat.
  • Page 108 Part to be replaced Work procedure Remarks PMV motor PMV 1 motor 1) PMV 1 motor 1. Detachment 1) Carry out the detachment of item 1 . 2) Remove the connector from Control P.C. Board. CN82 ... PMV motor (6P : Blue) 3) Loosen the nut fixing PMV motor by the two wrenches and remove the PMV motor.
  • Page 109 Part to be replaced Work procedure Remarks Pressure sensor 1. Detachment (PD, PS) 1) Carry out the detachment of item 1 . Check joint 2) Remove the connectors from I/F P.C. board. CN606 ...PD (3 P : Black) CN605 ...PS (3 P : Yellow) 3) Remove the cap for check joint and attach the pressure sensor by two wrenches with the PD sensor...

  • Page 110: Exploded Diagram / Service Parts List

    11. EXPLODED DIAGRAM / SERVICE PARTS LIST MMW-AP0481CHQ-E MMW-AP0481CHQ-TR 018, 038 018, 037 014, 015, 016 032, 033, 034 012, 013 029, 030, 031 – 110 –...
  • Page 111 43103150 CABINET ASSY, BACK 43102662 CABINET ASSY, RIGHT 43102663 CABINET ASSY, LEFT 4312C170 FAN, ASSY 4312C171 GUARD, FAN 43119390 HANGER 4311L666 MARK,TOSHIBA 43096201 BUSHING 375J1701 COMPRESSOR DW422A3F-10M (R134a) 43049739 CUSHION, RUBBER 43F97212 43F50407 THERMOSTAT, BIMETAL 43F63317 THERMOSTAT, HOLDER 43160683 LEAD COMPRESSOR 43148170 ACCUMULATOR, 2.5L...
  • Page 112 E-Parts Q'ty/Set MMW-AP0481CHQ Location Part No. Description 4316V672 P.C.BOARD ASSY, MCC-1628 (I/F) 4316V673 P.C.BOARD ASSY, MCC-1643 (CONTROL) 4316V674 P.C.BOARD ASSY, MCC-1705 (IPDU) 43160567 TERMINAL BLOCK, 3P, 30A 43160561 TERMINAL, 4P 43160548 TERMINAL, 6P 43158243 REACTOR, CH-101 37550761 SENSOR ASSY, TD (F6) 43150404 SENSOR ASSY, TS (F6) 43050425...

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  • Page 150 TOSHIBA CARRIER CORPORATION 72-34 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa 212-8585, JAPAN Copyright © 2018 TOSHIBA CARRIER CORPORATION, ALL Rights Reserved.

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