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Mitsubishi Electric CMB-PW202V-J Service Handbook

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AIR CONDITIONERS
MODEL
CMB-PW202V-J
Service Handbook

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  Summary of Contents for Mitsubishi Electric CMB-PW202V-J

  • Page 1 AIR CONDITIONERS MODEL CMB-PW202V-J Service Handbook...
  • Page 2: Safety Precautions

    Safety Precautions Before installing the unit, thoroughly read the following safety precautions. Observe these safety precautions for your safety. WARNING This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death.
  • Page 3 WARNING Securely attach the terminal block cover (panel) to the After completing the service work, check for a gas unit. leak. If the terminal block cover (panel) is not installed properly, If leaked refrigerant is exposed to a heat source, such as a dust and/or water may infiltrate and pose a risk of electric fan heater, stove, or electric grill, poisonous gases may be shock, smoke, and/or fire.
  • Page 4 Precautions for handling units for use with R410A CAUTION Do not use the existing refrigerant piping. Use a vacuum pump with a reverse-flow check valve. A large amount of chlorine that is contained in the residual If a vacuum pump that is not equipped with a reverse-flow refrigerant and refrigerator oil in the existing piping may check valve is used, the vacuum pump oil may flow into the cause the refrigerator oil in the new unit to deteriorate.
  • Page 5: Before Installing The Unit

    Before installing the unit WARNING Do not install the unit where a gas leak may occur. When installing the unit in a hospital, take appropriate measures to reduce noise interference. If gaseous refrigerant leaks and piles up around the unit, it may be ignited.
  • Page 6: Electrical Work

    Before installing the unit (moving and reinstalling the unit) and performing electrical work CAUTION Properly ground the unit. Periodically check the installation base for damage. Do not connect the grounding wire to a gas pipe, water pipe, If the unit is left on a damaged platform, it may fall and lightning rod, or grounding wire from a telephone pole.
  • Page 7 Before the test run CAUTION Turn on the unit at least 12 hours before the test run. Do not operate the unit without panels and safety guards. Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunc- Rotating, high-temperature, or high-voltage parts on the unit tions.
  • Page 8: Table Of Contents

    CONTENTS I Read Before Servicing [1] Read Before Servicing......................3 [2] Necessary Tools and Materials ....................4 [3] Piping Materials ........................5 [4] Storage of Piping ........................7 [5] Pipe Processing........................7 [6] Brazing............................8 [7] Air Tightness Test........................9 [8] Vacuum Drying (Evacuation) ....................
  • Page 9 HWE09070...
  • Page 10: Read Before Servicing

    I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Piping Materials ......................... 5 [4] Storage of Piping ....................... 7 [5] Pipe Processing ......................... 7 [6] Brazing..........................8 [7] Air Tightness Test ......................9 [8] Vacuum Drying (Evacuation) ...................
  • Page 11 - 2 -...
  • Page 12: Read Before Servicing

    [ I Read Before Servicing ] I Read Before Servicing [1] Read Before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Multi air conditioner for building application CITY MULTI R2/WR2 YHM-A series R410A 2.
  • Page 13: Necessary Tools And Materials

    [ I Read Before Servicing ] [2] Necessary Tools and Materials Prepare the following tools and materials necessary for installing and servicing the unit. Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1.
  • Page 14: Piping Materials

    [ I Read Before Servicing ] [3] Piping Materials Do not use the existing piping! 1. Copper pipe materials O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands. 1/2H-material (Drawn) Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed) at the same radial thickness.
  • Page 15 [ I Read Before Servicing ] 4. Thickness and refrigerant type indicated on the piping materials Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant. 5. Flare processing (O-material (Annealed) and OL-material only) The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system. Flare processing dimensions (mm[in]) A dimension (mm) Pipe size (mm[in])
  • Page 16: Storage Of Piping

    [ I Read Before Servicing ] [4] Storage of Piping 1. Storage location Store the pipes to be used indoors. (Warehouse at site or owner's warehouse) If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe. 2.
  • Page 17: Brazing

    [ I Read Before Servicing ] [6] Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of oxidized solder for brazing Use of non-oxidized solder for brazing 1.
  • Page 18: Air Tightness Test

    [ I Read Before Servicing ] [7] Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak. Halide torch R22 leakage detector 1. Items to be strictly observed Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight- ness, taking temperature variations into account.
  • Page 19: Vacuum Drying (Evacuation)

    [ I Read Before Servicing ] [8] Vacuum Drying (Evacuation) (Photo1) 15010H (Photo2) 14010 Recommended vacuum gauge: ROBINAIR 14010 Thermistor Vacuum Gauge 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.
  • Page 20 [ I Read Before Servicing ] 7. Notes To evacuate air from the entire system Applying a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2) is not enough to attain the desired vacuum pressure. Be sure to apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2) and also through the check joints on the high and low pressure sides (CJ1 and 2).
  • Page 21: Refrigerant Charging

    [ I Read Before Servicing ] [9] Refrigerant Charging Cylinder with a siphon Cylinder without a siphon Cylin- Cylin- Cylinder color R410A is pink. Refrigerant charging in the liquid state Valve Valve liquid liquid 1. Reasons R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22.
  • Page 22: Characteristics Of The Conventional And The New Refrigerants

    [ I Read Before Servicing ] [11] Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.
  • Page 23: Notes On Refrigerating Machine Oil

    [ I Read Before Servicing ] [12] Notes on Refrigerating Machine Oil 1. Refrigerating machine oil in the HFC refrigerant system HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system. Note that the ester oil used in the system has properties that are different from commercially available ester oil. Refrigerant Refrigerating machine oil Mineral oil...
  • Page 24: Restrictions

    II Restrictions [1] System configuration ....................... 17 [2] Switch Settings and Address Settings ................18 [3] An Example of a System to which an MA Remote Controller is connected..... 20 [4] Restrictions on Pipe Length ..................... 23 - 15 - HWE09070...
  • Page 25 - 16 -...
  • Page 26: System Configuration

    [ II Restrictions ] II Restrictions [1] System configuration 1. Table of compatible indoor units The table below summarizes the types of indoor units that are compatible with different types of outdoor units. (1) Standard combinations Outdoor Composing units Maximum total capacity Maximum number Types of connectable in- units...
  • Page 27: Switch Settings And Address Settings

    [ II Restrictions ] [2] Switch Settings and Address Settings 1. Switch setting The need for switch settings depends on the system configuration. Read section "[3] An Example of a System to which an MA Remote Controller is connected" before performing wiring work. Set the switches while the power is turned off.
  • Page 28 [ II Restrictions ] - 19 - HWE09070...
  • Page 29: An Example Of A System To Which An Ma Remote Controller Is Connected

    [ II Restrictions ] [3] An Example of a System to which an MA Remote Controller is connected 1. System with one outdoor unit (automatic address setup for both indoor and outdoor units) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Group...
  • Page 30 [ II Restrictions ] (4) Wiring method Set one of the MA remote controllers as a sub controller. (Refer to the Instruction Manual for the MA remote con- 1) Indoor/outdoor transmission line troller for the setting method.) Daisy-chain terminals M1 and M2 of the terminal block Group operation of indoor units for indoor-outdoor transmission line (TB3) on the outdoor To perform a group operation of indoor units (IC), daisy-...
  • Page 31 [ II Restrictions ] - 22 - HWE09070...
  • Page 32: Restrictions On Pipe Length

    [ II Restrictions ] [4] Restrictions on Pipe Length Outdoor unit H’ Indoor/PWFY (Line branch possible) Header branch branch PWFY branch capped Line branch (Header branch possible) PWFY PWFY PWFY Indoor Indoor Indoor PWFY Unit: m [ft] Operation Pipe sections Allowable length of pipes Length Total pipe length...
  • Page 33 [ II Restrictions ] Restrictions on pipe length [PURY-(E)P200, P250,P300YHM-A The height difference and the pipe length between WCB and indoor units PQRY-P200,P250,P300YHM-A] 1000 [229] [3280] [2952] [196] [2624] [164] [2296] [131] [1968] [98] [1640] [64] [1312] [32] [984] [656] 90 100 110 [32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360] [16]...
  • Page 34 [ II Restrictions ] 1. Refrigerant pipe size (1) Pipe size between outdoor unit and WCB (Part A) Unit : mm [inch] Refrigerant pipe size Connection to outdoor unit and WCB Outdoor units Low-pressure pipe High-pressure pipe Low-pressure pipe High-pressure pipe ø19.05 [3/4"] ø15.88 [5/8"] ø19.05 [3/4"]...
  • Page 35 [ II Restrictions ] 2. Connecting the WCB (1) Size of the pipe that fits the standard WCB ports (E)P200 - P350 models Connection: Brazed connection To outdoor unit Connection: Brazed connection Connection: Brazed connection PWFY PWFY PWFY Indoor Indoor Indoor PWFY When connecting multiple indoor units to a single port, select the proper size pipes based on the total capacity of the down-...
  • Page 36: Iii Wcb Components

    III WCB Components [1] WCB Components ......................29 [2] Control Box of the WCB....................30 [3] WCB Circuit Board......................31 - 27 - HWE09070...
  • Page 37 - 28 -...
  • Page 38: Wcb Components

    [ III WCB Components ] III WCB Components [1] WCB Components (1) Front Liquid pipe (Indoor unit side or PWFY side) Liquid pipe (PWFY side) Gas pipe (Indoor unit side or PWFY side) Gas pipe (PWFY side) (2) Rear view Tube in tube heat exchanger TH14 TH16...
  • Page 39: Control Box Of The Wcb

    [ III WCB Components ] [2] Control Box of the WCB Transformer Terminal block for power supply Terminal block for transmission line WCB board - 30 - HWE09070...
  • Page 40: Wcb Circuit Board

    [ III WCB Components ] [3] WCB Circuit Board - 31 - HWE09070...
  • Page 41 [ III WCB Components ] - 32 - HWE09070...
  • Page 42: Electrical Wiring Diagram

    IV Electrical Wiring Diagram [1] Electrical Wiring Diagram of the WCB ................35 - 33 - HWE09070...
  • Page 43 - 34 -...
  • Page 44: Electrical Wiring Diagram Of The Wcb

    [ IV Electrical Wiring Diagram ] IV Electrical Wiring Diagram [1] Electrical Wiring Diagram of the WCB - 35 - HWE09070...
  • Page 45 [ IV Electrical Wiring Diagram ] - 36 - HWE09070...
  • Page 46: Refrigerant Circuit

    V Refrigerant Circuit [1] Refrigerant Circuit Diagram ..................... 39 [2] Principal Parts and Functions ..................40 - 37 - HWE09070...
  • Page 47 - 38 -...
  • Page 48: Refrigerant Circuit Diagram

    [ V Refrigerant Circuit ] V Refrigerant Circuit [1] Refrigerant Circuit Diagram PWFY unit gas pipe (Heating only) SVM1 Brazed TH11 TH13 R2 high pressure pipe PWFY unit liquid pipe Brazed (Heating only) LEV1 Gas/Liquid separator Brazed TH14 TH12 HIC Circuit TH15 LEV3 Indoor or PWFY unit liquid pipe...
  • Page 49: Principal Parts And Functions

    [ V Refrigerant Circuit ] [2] Principal Parts and Functions Symbols Part Part name Usage Specifications Check method (functions) code Thermistor TH11 1) Detects High-pressure (Liquid inlet saturation temperature = 15k tempera- 2) LEV control (differential = 3460 0/80 ture) temperature control) R = 15 3460...
  • Page 50: Control

    VI Control [1] Functions and Factory Settings of the Dipswitches ............43 [2] Controlling WCB ......................44 [3] Operation Flow Chart....................... 46 - 41 - HWE09070...
  • Page 51 - 42 -...
  • Page 52: Functions And Factory Settings Of The Dipswitches

    [ VI Control ] VI Control [1] Functions and Factory Settings of the Dipswitches 1. Switch functions <WCB (Control board) > Function according to switch setting Switch Function Switch setting timing 1 - 8 1 - 8 1 - 4 Energy save mode Disabled Enabled...
  • Page 53: Controlling Wcb

    [ VI Control ] [2] Controlling WCB 1. Control of SVM1 SVM turns on or off depending on the operation mode. Operation Cooling only Cooling main Heating only Heating main Defrost Stopped mode Differential tem- SVM1 perature con- trol *1. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between TH11 and TH13) in the specified range on a minute basis.
  • Page 54 [ VI Control ] 3. 21S4a operation control 21S4a turns on or off according to the operation mode. Operation Cooling only Cooling main Heating only Heating main Defrost Stopped mode The status be- 21S4a fore defrosting maintained Operation mode switching (Cooling/Heating) at the indoor unit connection port Compressor in...
  • Page 55: Operation Flow Chart

    [ VI Control ] [3] Operation Flow Chart 1. Mode determination flowchart (1) Indoor unit (cooling, heating, dry, fan mode) Start Normal operation Error Breaker Stop turned on Operation SW turned on *Note 1 1. Protection function self-holding cancelled. 2. Indoor unit LEV fully closed. *Note 2 Remote controller Error mode...
  • Page 56 [ VI Control ] (2) Outdoor unit (cooling only, heating only, cooling main and heating main modes) Start Normal operation Error Breaker turned on Unit in the stopped state "HO" / "PLEASE WAIT" blinks *Note 1 on the remote controller Indoor units registered to the remote controller...
  • Page 57 [ VI Control ] (3) WCB (cooling only, heating only, cooling main and heating main modes) Start Normal operation Error Breaker turned on Unit in the stopped state Operation command 1. Determination of operation mode Protection function (Cooling only, Heating only, Mixture self-holding cancelled.
  • Page 58 [ VI Control ] 2. Operations in each mode (1) Cooling operation Cooling operation Normal operation During test run mode 4-way valve OFF Unit in the stopped state Indoor unit fan *Note 1 operation Test run mode Thermostat 3-minute restart prevention 1.
  • Page 59 [ VI Control ] (2) Heating operation Normal operation Heating operation Defrost operation *Note 1,2 Unit in the stopped state Defrost operation During test run mode 4-way valve ON 4-way valve OFF Test run mode 1. Indoor unit fan stop 2.
  • Page 60 [ VI Control ] (3) Dry operation Dry operation Normal operation Thermostat ON 4-way valve OFF Unit in the stopped state Test run mode *Note 2 Thermostat ON Suction temperature 18 C[64 F] *Note 1 1. Indoor unit fan stop 1.
  • Page 61 [ VI Control ] - 52 - HWE09070...
  • Page 62: Test Run Mode

    VII Test Run Mode [1] Items to be checked before a Test Run ................55 [2] Adjusting the Refrigerant Amount ..................56 [3] The following symptoms are normal................56 [4] Standard Operation Data (Reference Data) ..............57 - 53 - HWE09070...
  • Page 63 - 54 -...
  • Page 64: Items To Be Checked Before A Test Run

    [ VII Test Run Mode ] VII Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.
  • Page 65: Adjusting The Refrigerant Amount

    [ VII Test Run Mode ] [2] Adjusting the Refrigerant Amount Calculate the amount of refrigerant to be charged for WCB in the same way as that for BC controller. [3] The following symptoms are normal. Remote controller Symptoms Cause display The indoor unit does not start "Cooling (heating)"...
  • Page 66: Standard Operation Data (Reference Data)

    [ VII Test Run Mode ] [4] Standard Operation Data (Reference Data) 1. Single unit (Standard) <PURY> (1) Cooling only operation Outdoor unit model Operation PURY-P250YHM-A Model name of WCB CMB-PW202V-J 27°C/19°C Indoor Ambient [81°F/66°F] tempera- DB/WB 35°C/− ture Outdoor [95°F/−]...
  • Page 67 [ VII Test Run Mode ] (2) Heating only operation Outdoor unit model Operation PURY-P250YHM-A Model name of WCB CMB-PW202V-J 20°C/− Indoor Ambient [68 °F/-] tempera- DB/WB 7°C/6°C ture Outdoor [45 °F/43 °F] No. of connected units Unit Indoor unit No.
  • Page 68 [ VII Test Run Mode ] 2. Single unit (High-COP) <PURY> (1) Cooling only operation Outdoor unit model Operation PURY-EP250YHM-A Model name of WCB CMB-PW202V-J 27°C/19°C Indoor Ambient [81 °F/66 °F] tempera- DB/WB 35°C/− ture Outdoor [95 °F/−] No. of connected units...
  • Page 69 [ VII Test Run Mode ] (2) Heating only operation Outdoor unit model Operation PURY-EP250YHM-A Model name of WCB CMB-PW202V-J 20°C/− Indoor Ambient [68°F/-] tempera- DB/WB 7°C/6°C ture Outdoor [45 °F/43 °F] No. of connected units Unit Indoor unit No. of units in operation...
  • Page 70 [ VII Test Run Mode ] 3. Single unit<PQRY> (1) Cooling only operation Heat source unit model Item PQRY-P200YHM-A Model name of WCB CMB-PW202V-J 27°C/19°C Indoor temperature DB/WB [81 °F/66 °F] Heat source water temperature °C[ °F] 30.0[86] 5.76 Heat source water flow rate...
  • Page 71 [ VII Test Run Mode ] (2) Heating only operation Heat source unit model Item PQRY-P250YHM-A Model name of WCB CMB-PW202V-J 20°C/− Indoor temperature DB/WB [68 °F/−] Heat source water temperature °C[ °F] 20.0[68] 5.76 Heat source water flow rate...
  • Page 72: Troubleshooting

    VIII Troubleshooting [1] Error Code Lists ....................... 65 [2] Responding to Error Display on the Remote Controller........... 66 [3] Troubleshooting Principal Parts ..................87 [4] Servicing the WCB......................97 - 63 - HWE09070...
  • Page 73 - 64 -...
  • Page 74: Error Code Lists

    [ VIII Troubleshooting ] VIII Troubleshooting [1] Error Code Lists Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 2502 Drain pump fault Liquid inlet temperature 5111 (TH11) Bypass outlet temperature 5112 (TH12) LEV1 outlet temperature 5113 (TH13) Temperature sensor...
  • Page 75: Responding To Error Display On The Remote Controller

    [ VIII Troubleshooting ] [2] Responding to Error Display on the Remote Controller 1. Error Code 2502 Drain pump fault (Models with a drain sensor) 2. Error definition and error detection method 1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in water.
  • Page 76 [ VIII Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a float switch) 2. Error definition and error detection method 1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch. ∗Submergence of the sensor When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in water.
  • Page 77 [ VIII Troubleshooting ] 1. Error Code 5111 Liquid inlet temperature sensor (TH11) fault (WCB) 5112 Bypass outlet temperature sensor (TH12) fault (WCB) 5113 LEV1 outlet temperature sensor (TH13) fault (WCB) 5114 HIC inlet temperature sensor (TH14) fault (WCB) 5115 LEV3 outlet temperature sensor (TH15) fault (WCB) 5116 LEV3 inlet temperature sensor (TH16) fault (WCB)
  • Page 78 [ VIII Troubleshooting ] 1. Error Code 6600 Address overlaps 2. Error definition and error detection method An error in which signals from more than one indoor units with the same address are received The address and attribute that appear on the remote controller indicate the controller that detected the error. 3.
  • Page 79 [ VIII Troubleshooting ] 1. Error Code 6602 Transmission processor hardware error 2. Error definition and error detection method Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 80 [ VIII Troubleshooting ] 1. Error Code 6603 Transmission line bus busy error 2. Error definition and error detection method Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 81 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 82 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 83 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 84 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 85 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 86 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 87 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 88 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 89 [ VIII Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 90 [ VIII Troubleshooting ] 1. Error Code 6608 No response error 2. Error definition and error detection method When no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- When the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 91 [ VIII Troubleshooting ] 1. Error Code 7100 Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 92 [ VIII Troubleshooting ] 1. Error Code 7102 Wrong number of connected units 2. Error definition and error detection method The number of connected indoor units is "0" or exceeds the allowable value. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 93 [ VIII Troubleshooting ] 1. Error Code 7105 Address setting error 2. Error definition and error detection method Erroneous setting of OC unit address Erroneous setting of WCB address 3. Cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Erroneous setting of OC unit address Check that the outdoor unit and WCB address-...
  • Page 94 [ VIII Troubleshooting ] 1. Error Code 7107 Port setting error 2. Error definition and error detection method The port with wrong number is connected to the indoor unit.The model total connected to the port is greater than the specifi- cation.
  • Page 95 [ VIII Troubleshooting ] 1. Error Code 7130 Incompatible unit combination 2. Error definition and error detection method An error code appears when the connected indoor units or outdoor units are for use with other types of refrigerant. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 96: Troubleshooting Principal Parts

    [ VIII Troubleshooting ] [3] Troubleshooting Principal Parts -1- LEV LEV operation LEV are stepping-motor-driven valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoor LEV and BC controller LEV The valve opening changes according to the number of pulses. 1) Control boards and the LEV Outdoor control board Intermediate connector...
  • Page 97 [ VIII Troubleshooting ] (2) Judgment methods and possible failure mode Malfunction Judgment method Remedy mode Microcomputer Disconnect the control board connector and connect When the drive circuit has a driver circuit fail- the check LED as shown in the figure below. problem, replace the control board.
  • Page 98: Temperature Sensor

    [ VIII Troubleshooting ] -2- Troubleshooting Principal Parts of WCB 1. Temperature sensor Troubleshooting instructions for thermistor START Note 1 Pull out the thermistor connector in trouble from the board. Note 2 Measure the temperature of the thermistor in trouble. (actual measurement value) Note 2 Check the thermistor resistor.
  • Page 99 [ VIII Troubleshooting ] 1) TH11 through TH14 are connected to CN10 and TH15 and TH16 are connected to CN11 on the circuit board. Unplug the corresponding connectors before checking each sensor. Pull out the sensor connector from the I/O board, Do not pull the sensor by holding the lead wire. Measure the resistance with such as a tester.
  • Page 100 [ VIII Troubleshooting ] 2. Troubleshooting flow chart for LEV Solenoid valve (1) LEV No cooling capacity No heating capacity Note 1 Check whether the electric expansion valve and the solenoid valve connector are not disconnected or not loose. Repair the fault. Fault is found.
  • Page 101 [ VIII Troubleshooting ] 1) WCB: Phenomena when LEV is connected wrongly (reverse connection of LEV1 and LEV3) to the board. Phenomena Cooling only Cooling main Heating only Heating main Non-cooling Non-cooling and non-heating Poor heating performance Non-cooling SC12 small SH12 small Indoor heating SC small Indoor heating SC small...
  • Page 102 [ VIII Troubleshooting ] Self-diagnosis LED Measurement data Symbol SW1 setting value 1 2 3 4 5 6 7 8 9 10 LEV1 opening 1 2 3 4 5 6 7 8 9 10 LEV3 opening 1 2 3 4 5 6 7 8 9 10 WCB bypass SH12 outlet superheat...
  • Page 103 [ VIII Troubleshooting ] Troubleshooting flowchart for the LEV Start Check for pins not fully inserted on the connector and check the colors of the lead wires visually. Intermediate connector Control board When LEV is fully closed : tick sound When LEV is fully open : no sound Brown Brown...
  • Page 104 [ VIII Troubleshooting ] (2) Solenoid valve (SVM1, 21S4a) Faulty judgment of solenoid valve Stop the operation of the applied BC remote controller system. Stop the operation Check whether the wire to the solenoid valve is not connected wrongly, or the connector is not loose. No fault Repair the fault.
  • Page 105 [ VIII Troubleshooting ] Check whether the BC board output signal corresponds with the solenoid valve operation correspond. 1) SVM1 SVM1 turns on or off according to the operation mode. Operation Cooling only Cooling main Heating only Heating main Defrost Stopped mode Differential...
  • Page 106: Servicing The Wcb

    [ VIII Troubleshooting ] [4] Servicing the WCB 1. Service panel *Special care must be taken when replacing heavy parts. Work procedure Explanatory figure 1) Remove the two lock nuts on the control box, loosen the other two, and remove the control box. 2) Remove the three fixing screws on the service panel, Ceiling panel Loosen...
  • Page 107 [ VIII Troubleshooting ] 4. LEV Work procedure Explanatory figure (1) Remove the service panel. (See figure at right.) (2) Replace the LEV in trouble. Secure enough service space in the ceiling for welding operation, and conduct the work carefully.If required, dismount the unit from the ceiling, and conduct the work.
  • Page 108: Led Monitor Display On The Outdoor Unit Board

    IX LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor ............... 101 - 99 - HWE09070...
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  • Page 110: How To Read The Led On The Service Monitor

    [ IX LED Monitor Display on the Outdoor Unit Board ] IX LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
  • Page 111 [ IX LED monitor display on the outdoor unit board ] - 102 - HWE09070...
  • Page 112 [ IX LED monitor display on the outdoor unit board ] - 103 - HWE09070...
  • Page 113 [ IX LED monitor display on the outdoor unit board ] - 104 - HWE09070...
  • Page 114 Service Handbook CMB-PW202V-J Issued in Sep. 2009 HWE09070 New publication effective Sep. 2009. Printed in Japan Specifications subject to change without notice.