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Mitsubishi Electric CITY MULTI PUHY-400YMF-B Service Handbook

City multi series y, super y
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AIR CONDITIONERS CITY MULTI Series Y, Super Y
PUHY-400YMF-B, 500YMF-B
Models
PUHY-P400YMF-B, P500YMF-B
PUHY-600YSMF-B, 650YSMF-B, 700YSMF-B, 750YSMF-B
PUHY-P600YSMF-B, P650YSMF-B, P700YSMF-B, P750YSMF-B
Service Handbook

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Summary of Contents for Mitsubishi Electric CITY MULTI PUHY-400YMF-B

  • Page 1 AIR CONDITIONERS CITY MULTI Series Y, Super Y PUHY-400YMF-B, 500YMF-B Models PUHY-P400YMF-B, P500YMF-B PUHY-600YSMF-B, 650YSMF-B, 700YSMF-B, 750YSMF-B PUHY-P600YSMF-B, P650YSMF-B, P700YSMF-B, P750YSMF-B Service Handbook...

  • Page 2: Table Of Contents

    Contents 1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT ......... 1 [1] Storage of Piping Material ..........2 [2] Piping Machining ............3 [3] Necessary Apparatus and Materials and Notes on Their Handling ............... 4 [4] Brazing ................5 [5] Airtightness Test ............. 6 [6] Vacuuming ..............

  • Page 3: Safety Precautions

    - If the pressure switch, thermal switch, or other protection de- Carefully read the labels affixed to the main unit. vice is shorted and operated forcibly, or parts other than those specified by Mitsubishi Electric are used, fire or explosion may result. Warning: •...

  • Page 4: Precautions For Devices That Use R407C Refrigerant

    1 1 1 1 1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT Caution Do not use the existing refrigerant piping. Use a vacuum pump with a reverse flow check valve. • The vacuum pump oil may flow back into the refriger- •...

  • Page 5: Storage Of Piping Material

    [1] Storage of Piping Material (1) Storage location Store the pipes to be used indoors. (Warehouse at site or owner’s warehouse) Storing them outdoors may cause dirt, waste, or water to infiltrate. (2) Pipe sealing before storage Both ends of the pipes should be sealed until immediately before brazing. Wrap elbows and T’s in plastic bags for storage.

  • Page 6: Piping Machining

    [2] Piping Machining Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections. Use only the necessary minimum quantity of oil ! Reason: 1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside. Notes: •...

  • Page 7: Necessary Apparatus And Materials And Notes On Their Handling

    [3] Necessary Apparatus and Materials and Notes on Their Handling The following tools should be marked as dedicated tools for R407C. <<Comparison of apparatus and materials used for R407C and for R22>> Apparatus Used R407C Gauge manifold Evacuating, refrigerant filling Current product Charging hose Operation check...

  • Page 8: Brazing

    [4] Brazing No changes from the conventional method, but special care is required so that foreign matter (ie. oxide scale, water, dirt, etc.) does not enter the refrigerant circuit. Example: Inner state of brazed section When non-oxide brazing was not used When non-oxide brazing was used Items to be strictly observed: 1.

  • Page 9: Airtightness Test

    [5] Airtightness Test No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C leakage. Halide torch R22 leakage detector Items to be strictly observed: 1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment’s airtightness, taking temperature variations into account.

  • Page 10: Charging Of Refrigerant

    [7] Charging of Refrigerant R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant. For a cylinder with a syphon attached For a cylinder without a syphon attached Cylin- Cylin- Cylinder color identification R407C-Gray Charged with liquid refrigerant R410A-Pink Valve Valve...

  • Page 11: Component Of Equipment

    2 2 2 2 2 COMPONENT OF EQUIPMENT [1] Appearance of Components 1 Variable capacity unit Heat Exchanger Ambient temperature Sensor Accumulator Oil Separator Variable Capacity Oil Equalization Pipe Belt Heater Constant Capacity Compressor Compressor (No.1 (No.2 Compressor) Compressor) Rear Heat Exchanger Four-way Valve (21S4a)
  • Page 12 Controller Box RELAY board FANCON board Choke coil (L2) MAIN board INV board Magnetic contactor Thyristor module Transistor module (52C2) (SCRM) (TRM) Thermal overload (51C2) Diode stack (DS) Magnetic contactor Magnetic contactor Capacitor (C2, C3) (52F) (52C1) (Smoothing capacitor) –9–...
  • Page 13 Noise Filter Box (Rear of the controller box) DC reactor (DCL) Noise filter box Noise filter (NF) –10–...
  • Page 14 MAIN board CN40 CNS2 M-NET transmission M-NET transmis- power supply sion (Centralized control) CNS1 CNVCC4 M-NET Power source for transmission CNTR CNFC1 control CNVCC3 Power source for control 1-2 30 V, 1-3 30 V 4-6 12 V, 5-6 5 V CN51 Indication distance 3-4 Compressor...

  • Page 15: Inv Board

    INV board Output to transistor module CN2-1 CN2-2 CN2-3 CNVCC2 Power supply (5 V) CNVCC1 Power supply 1-2 30 V, 1-3 30 V, 4-6 12 V, 5-6 5 V CNL2 CN30V CNVDC CNTH CN52C CNCT CNFAN CNAC2 Power source 1 L2 CNRS2 –12–...
  • Page 16 FANCON board CNFC2 –13–...

  • Page 17: Relay Board

    RELAY board CN51C2 CNOUT2 CNRT2 CN52F CN52C2 CNCH –14–...
  • Page 18 2 Constant capacity unit Solenoid valve (SV3, PUHN-P-YMF-B only) Solenoid valve (SV2, PUHN-P-YMF-B only) Ambient temperature sensor Heat exchanger Accumlator Four- way valve Controller box Service check-point (right; high pressure, left; low pressure) Gas ball valve Liquid ball valve Constant capacity compressor Belt heater Oil balance pipe (No.3 compressor)
  • Page 19 Controller Box CONT board Terminal block TB1 Terminal block TB3 powersource transmission Transformer FANCON board Magnetic contactor Noise Filter (NF) (52C) Thermal overload relay (51C) Thyristor module (SCRM) Fuses (F1,F2) –16–...
  • Page 20 CONT board CNS1 M-NET CNFC1 SWU1 transmission SWU2 CNTR CN20 Power supply 3 L1 –17–...

  • Page 21: Refrigerant Circuit Diagram And Thermal Sensor

    [2] Refrigerant Circuit Diagram and Thermal Sensor 1 PUHY-P400·500YMF-B –18–...
  • Page 22 2 PUHY-400·500YMF-B –19–...
  • Page 23 3 PUHY-P600·650·700·750YSMF-B –20–...
  • Page 24 4 PUHY-600·650·700·750YSMF-B –21–...

  • Page 25: Equipment Composition

    [3] Equipment Composition A. Outdoor Unit PUHY-(P)600·650·700·750 PUHY-(P)400·500YMF-B YSMF-B B. Branch Pipe Kit Branch header Branch joint 4-connection 7-connection 10-connection Oil balance pipe 1 Distributer (gas) Oil balance pipe 2 Distributer (liquid) CMY-Y102S-F CMY-Y102L-F CMC-30A* CMY-Y104-E CMY-Y107-E CMY-Y1010-E CMY-Y202-F CMY-Y302-F In the case of the PUHY-(P)YSMF-B, the CMC-30A is necessary.
  • Page 26 –23–...

  • Page 27: Electrical Wiring Diagram

    [4] Electrical Wiring Diagram 1 PUHY-(P)400·500YMF-B –24–...
  • Page 28 –25–...
  • Page 29 2 PUHN-(P)200·250YMF-B –26–...

  • Page 30: Standard Operation Data

    [5] Standard Operation Data 1 Cooling operation Outdoor unit PUHY-P400YMF-B PUHY-P500YMF-B Items Indoor 27.0/19.5 27.0/19.5 Ambient temp. DB/WB Outdoor 35.0/24.0 35.0/24.0 Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 28.9...
  • Page 31 Outdoor unit PUHY-P600YSMF-B PUHY-P700YSMF-B Variable PUHY-P400YMF-B PUHY-P500YMF-B capacity unit Constant PUHN-P200YMF-B PUHN-P200YMF-B Items capacity unit Indoor 27/19.5 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9 35.9...
  • Page 32 Outdoor unit PUHY-P650YSMF-B PUHY-P750YSMF-B Variable PUHY-P400YMF-B PUHY-P500YMF-B capacity unit Constant PUHN-P250YMF-B PUHN-P250YMF-B Items capacity unit Indoor 27/19.5 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9 37.9...
  • Page 33 Outdoor unit PUHY-400YMF-B PUHY-500YMF-B Items 27.0/19.5 27.0/19.5 Indoor Ambient temp. DB/WB Outdoor 35.0/24.0 35.0/24.0 Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 28.9 28.2/26.8/25.8 34.2/32.5/31.3 Total current...
  • Page 34 Outdoor unit PUHY-600YSMF-B PUHY-700YSMF-B Variable PUHY-400YMF-B PUHY-500YMF-B capacity unit Constant PUHN-200YMF-B PUHN-200YMF-B Items capacity unit Indoor 27/19.5 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9...
  • Page 35 Outdoor unit PUHY-650YSMF-B PUHY-750YSMF-B Variable PUHY-400YMF-B PUHY-500YMF-B capacity unit Constant PUHN-250YMF-B PUHN-250YMF-B Items capacity unit Indoor 27/19.5 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9...
  • Page 36 2 Heating operation Outdoor unit Items PUHY-P400YMF-B PUHY-P500YMF-B Indoor 21.0/- 21.0/- Ambient temp. DB/WB Outdoor 7.0/6.0 7.0/6.0 Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 28.7 Total current 26.5/25.2/24.3 32.8/31.1/30.0...
  • Page 37 Outdoor unit PUHY-P600YSMF-B PUHY-P700YSMF-B Variable PUHY-P400YMF-B PUHY-P500YMF-B capacity unit Constant PUHN-P200YMF-B PUHN-P200YMF-B Items capacity unit Indoor 21/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9 35.9...
  • Page 38 Outdoor unit PUHY-P650YSMF-B PUHY-P750YSMF-B Variable PUHY-P400YMF-B PUHY-P500YMF-B capacity unit Constant PUHN-P250YMF-B PUHN-P250YMF-B Items capacity unit Indoor 21/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9 37.9...
  • Page 39 Outdoor unit Items PUHY-400YMF-B PUHY-500YMF-B Indoor 21.0/- 21.0/- Ambient temp. DB/WB Outdoor 7.0/6.0 7.0/6.0 Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 28.7 Total current 26.0/24.7/23.8 32.2/30.6/29.5...
  • Page 40 Outdoor unit PUHY-600YSMF-B PUHY-700YSMF-B Variable PUHY-400YMF-B PUHY-500YMF-B capacity unit Constant PUHN-200YMF-B PUHN-200YMF-B Items capacity unit Indoor 21/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9...
  • Page 41 Outdoor unit PUHY-650YSMF-B PUHY-750YSMF-B Variable PUHY-400YMF-B PUHY-500YMF-B capacity unit Constant PUHN-250YMF-B PUHN-250YMF-B Items capacity unit Indoor 21/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9...

  • Page 42: Function Of Dip Sw And Rotary Sw

    [6] Function of Dip SW and Rotary SW (1) Outdoor unit PUHY-P600·650·700·750YSMF-B. PUHY-P400·500YMF-B. 1 Variable capacity unit MAIN board Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On SWU 1 ~ 2 Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on.
  • Page 43 2 Constant Capacity Unit Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On SWU 1 ~ 2 Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on. Ordinary control Ignore liquid level errors Ignore liquid level errors...
  • Page 44 PUHY-600·650·700·750 YSMF-B. PUHY-400·500YMF-B. 1 Variable capacity unit MAIN board Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on. SWU 1 ~ 2 1 ~ 8 For self diagnosis/...
  • Page 45 2 Constant Capacity Unit Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On SWU 1 ~ 2 Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on. Ordinary control Ignore liquid level errors Ignore liquid level errors...
  • Page 46 (2) Indoor unit DIP SW1, 3 Operation by SW Switch set timing Remarks Switch SW name Room temp. sensor position Indoor unit inlet Built in remote controller Clogged filter detect. None Provided Filter duration 100h 2500h Always ineffective for PKFY-P.VAM OA intake Ineffective Effective...
  • Page 47 Setting of DIP SW4 Setting of DIP SW5 Model Circuit board used 220V 240V PMFY-P-DBM PLFY-P-VLMD – – – – PDFY-P20 ~ 80VM PLFY-P40 ~ 63VKM Phase control PLFY-P80 ~ 125VKM PCFY-P-VGM PKFY-P-VGM PKFY-P-VAM – – – – PFFY-P-VLEM, P-VLRM –...

  • Page 48: Test Run

    3 3 3 3 3 TEST RUN [1] Before Test Run (1) Check points before test run Neither refrigerant leak nor loose power source/ transmission lines should be found. Confirm that the resistance between the power source terminal block and the ground exceeds 2MΩ by measuring it with a DC 500 V megger.
  • Page 49 (3) Check points for test run when mounting options Built-in optional parts Content of test run Check point Result Release connector of pump circuit, Local remote controller displays code No. Mounting of drain check error detection by pouring water “2503”, and the mechanism stops. water lifting-up mechanism into drain pan water inlet.
  • Page 50 –47–...
  • Page 51 (5) Check points for system structure In the case of the PUHY-(P) 400·500 YMF-B Check points from installation work to test run. Classification Portion Check item Trouble Instruction for selecting combination of outdoor unit, and Not operate. Installation and piping indoor unit followed? (Maximum number of indoor units which can be connected, connecting model name, and total capacity.)
  • Page 52 Classification Portion Check item Trouble Transmission Limitation of transmission line length followed? For Erroneous operation, error stop. line example, 200 m or less (total length: 500 m) at the farthest. 1.25 mm or more transmission line used? Erroneous operation, error stop. (Remote controller 10 m or less 0.75 mm Error stop in case multiple-core 2-core cable used for transmission line?
  • Page 53 In the case of the PUHY-(P) 600·650·700·750 YSMF-B Check points from installation work to test run. Outdoor unit MAIN board Switch Power source Switch outdoor unit 1 2 3 4 5 Classification Portion Check item Trouble Instruction for selecting combination of outdoor unit, and Not operate.
  • Page 54 Classification Portion Check item Trouble Transmission Limitation of transmission line length followed? For Erroneous operation, error stop. line example, 200 m or less (total length: 500 m) at the farthest. 1.25 mm or more transmission line used? Erroneous operation, error stop. (Remote controller 10 m or less 0.75 mm Error stop in case multiple-core 2-core cable used for transmission line?

  • Page 55: Test Run Method

    [2] Test Run Method Operation procedure Turn on universal power supply at least 12 hours before getting started → Displaying “HO” on display panel for about two minutes button twice → Displaying “TEST RUN’’ on display panel Press TEST RUN selection button →...

  • Page 56: Grouping Registration Of Indoor Units With Remote Controller

    4 4 4 4 4 GROUPING REGISTRATION OF INDOOR UNITS WITH REMOTE CONTROLLER (1) Switch function • The switch operation to register with the remote controller is shown below: ON/OFF – CENTRALLY CONTROLLED 1Hr. ON OFF ˚C CHECK CLOCK FILTER ˚C CHECK MODE STAND BY...
  • Page 57 (2) Attribute display of unit • At the group registration and the confirmation/deletion of registration/connection information, the type (attribute) of the unit is displayed with two English characters. Display Type (Attribute) of unit/controller Indoor unit connectable to remote controller Outdoor unit (PUHY-(P)400/500YMF-B) Outdoor unit (PUHN-(P)200/250YMF-B) Local remote controller System controller (MJ)
  • Page 58 (3) Group registration of indoor unit 1) Registration method • Group registration of indoor unit ....1 The indoor unit to be controlled by a remote controller is registered on the remote controller. [Registration procedure] 1 With the remote controller under stopping or at the display of “HO”, continuously press the FILTER switch (A + B) at the same time for 2 seconds to change to the registration mode.
  • Page 59 Method of retrieval/confirmation • Retrieval/confirmation of group registration information on indoor unit ....2 The address of the indoor unit being registered on the remote controller is displayed. [Operation procedure] 1 With the remote controller under stopping or at the display of “HO”, continuously press the switch (A FILTER + B) at the same time for 2 seconds to change to the registration mode.
  • Page 60 • Registered ˚C INDOOR UNIT ERROR CODE ADDRESS NO OA UNIT ADDRESS NO ON/OFF – (Alternative display) CENTRALLY CONTROLLED 1Hr. ON OFF ˚C CHECK CLOCK FILTER ˚C CHECK MODE STAND BY INDOOR UNIT ERROR CODE TEST RUN NOT AVAILABLE DEFROST ADDRESS NO.
  • Page 61 Deletion of information on address not existing • Deletion of information on address not existing ....5 This operation is to be conducted when “6607” error (No ACK error) is displayed on the remote controller caused by the miss setting at test run, or due to the old memory remained at the alteration/modification of group composition, and the address not existing will be deleted.

  • Page 62: Control

    5 5 5 5 5 CONTROL [1] Control of Outdoor Unit [1]- 1 PUHY-P400·500 YMF-B (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed.
  • Page 63 • The operating temperature is 124°C (No. 1 compressor) or 115°C (No. 2 compressor). 4) Compressor frequency control 1 Ordinary control The ordinary control is performed after the following times have passed. • 30 seconds after the start of the compressor or 30 seconds after the completion of defrosting. •...
  • Page 64 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] Item — At compressor is started ON for 4 minutes — Compressor stopped during cool- ing or heating mode — ON for 3 minutes After operation has been stopped Normally ON During defrosting ((*1) in Fig below) ON during oil recovery operation af-...
  • Page 65 (5) Oil return control (Electronic expansion valve (SLEV)) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
  • Page 66 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. •...
  • Page 67 (10) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery 1 Refrigerant recovery is started when the two items below are fully satisfied. •...
  • Page 68 (12) Control at initial starting • When the ambient temperature is low (5°C or less in cooling and – 5°C or less in heating), initial starting will be performed if the unit is started within 4 hours of the power being turned on. •...
  • Page 69 <Initial start control timing chart> End of initial operation mode minutes 30 minutes 10 minutes 5 minutes (Example 1) ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 End of initial operation mode minutes minutes (Example 2)
  • Page 70 (13) Operation Mode 1) Operating modes of the indoor unit The following five modes can be set by the remote control. Cooling mode Heating mode Dry mode Fan mode Stop mode 2) Operating modes of the outdoor unit The following are the 3 modes for the outdoor unit. Cooling mode All indoor units are operated in cooling mode Heating mode...
  • Page 71 [1]-2 PUHY-400·500 YMF-B (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed. (Initial processing: Data processing in microcomputer and initial setting of each LEV opening, requiring approx.
  • Page 72 • The operating temperature is 124°C. 4) Compressor frequency control 1 Ordinary control The ordinary control is performed after the following times have passed. • 30 seconds after the start of the compressor or 30 seconds after the completion of defrosting. •...
  • Page 73 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] Item — At compressor is started ON for 4 minutes Compressor stopped during cool- — ing or heating mode — After operation has been stopped ON for 3 minutes During defrosting ((*1) in Fig below) Normally ON During oil recovery operation...
  • Page 74 (5) Oil return control (Electronic expansion valve (SLEV)) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
  • Page 75 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. •...
  • Page 76 (10) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery 1 Refrigerant recovery is started when the two items below are fully satisfied. •...
  • Page 77 (12) Control at initial starting • When the ambient temperature is low (5°C or less in cooling and – 5°C or less in heating), initial starting will be performed if the unit is started within 4 hours of the power being turned on. •...
  • Page 78 <Initial start control timing chart> End of initial operation mode minutes 30 minutes 10 minutes 5 minutes (Example 1) ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 End of initial operation mode minutes minutes (Example 2)
  • Page 79 (13) Operation Mode 1) Operating modes of the indoor unit The following five modes can be set by the remote control. Cooling mode Heating mode Dry mode Fan mode Stop mode 2) Operating modes of the outdoor unit The following are the 3 modes for the outdoor unit. Cooling mode All indoor units are operated in cooling mode Heating mode...
  • Page 80 [1]- 3 PUHY-P600·650·700·750 YSMF-B (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed. (Initial processing: Data processing in microcomputer and initial setting of each LEV opening, requiring approx.
  • Page 81 Switching No. 3 compressor from operation to stopping When the required performance is exceeded with the No. 1 and No. 2 variable capacity unit compressors and the constant capacity unit No. 3 compressor in operation, the No. 3 compressor will be stopped. 3) Pressure control •...
  • Page 82 (4) Bypass - capacity control The solenoid valves have bypass valves (SV1, SV4 and SV6) that allow bypassing of the high pressure and low pressure sides and solenoid valves (SV22 and SV32) that control the capacity valve inside the compressor. Those operation are as follows.
  • Page 83 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] <Variable capacity unit> Item At compressor is started ON for 4 minutes — Compressor stopped during cool- — ing or heating mode After operation has been stopped ON for 3 minutes —...
  • Page 84 <Constant Capacity Unit> Item At compressor is started ON for 4 minutes — After thermostat reset or 3 ON for 4 minutes — minutes after startup Compressor stopped during ON for 3 minutes — cooling or heating mode ON for 3 minutes —...
  • Page 85 (5) Oil return control (Electronic expansion valve (SLEV); Variable Capacity Unit only) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
  • Page 86 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. •...
  • Page 87 (10) Liquid Distribution Control (electronic expansion valve (LEV2) constant capacity unit only) • Liquid distribution control refers to the process by which liquid refrigerant returning from the constant and variable capacity units during heating is equally distributed, and the opening of the constant capacity unit LEV2 is adjusted so that there is no deficiency of liquid refrigerant in the accumulator of each unit.
  • Page 88 (11) Liquid Refrigerant Correction Control The liquid refrigerant correction control adjusts the liquid refrigerant amounts between both accumulators in the unlikely event that the liquid refrigerant amount in both the constant and variable capacity unit accumulators should be insufficient, or if and excessive amount of liquid refrigerant is returned from either accumulator. During this operation, Service LED No.
  • Page 89 (12) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery 1 Refrigerant recovery is started when the two items below are fully satisfied. •...
  • Page 90 (14) Control at initial starting • When the ambient temperature is low (5°C or less in cooling and – 5°C or less in heating), initial starting will not be performed even if the unit is started within 4 hours of the power being turned on. •...
  • Page 91 <Initial Start Control Timingchart> For steps 1 - 3 (Example 1) End of initial operation mode minutes 30 minutes 10 minutes 5 minutes ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 (Example 2) End of initial operation mode minutes minutes...
  • Page 92 For steps 4 - 6 (Example 1) minutes End of initial operation mode A-minute minutes ON/OFF of (A-minute Definitions) No.1 compressor Operation Conditions Frequency Level (Hz) Constant capacity unit ON/OFF of – power on 7 hours. minute No.2 compressor 217 (For variable capacity unit model 500) 63LS 4.2 K...
  • Page 93 (Example 4) Less than Less than minutes minutes minutes End of initial operation mode 10 minutes 10 minutes A-minute minutes ON/OFF of No.1 compressor ON/OFF of No.2 compressor Note 3 ON/OFF of Step 4 No.3 compressor Step 6 Note 4 Step 5 Step 6 Step 5...
  • Page 94 (17) Emergency response operating mode The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when the compressors (No. 1, No. 2) break down, making it possible to carry out a trouble reset using the remote control. 1) Starting the Emergency Operation Mode 1 Trouble occurs (Display the trouble code root and trouble code on the remote control).
  • Page 95 2) Terminating Emergency Response Operation Mode (Termination Conditions) When one of the following conditions is met, emergency operation mode is terminated. 1 Cumulative compressor operation time in the cooling mode exceeds 4 hours. 2 Cumulative compressor operation time in the heating mode exceeds 2 hours. 3 Emergency operation mode trouble detected.
  • Page 96 [1]-4 PUHY-600·650·700·750 YSMF-B (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed. (Initial processing: Data processing in microcomputer and initial setting of each LEV opening, requiring approx.
  • Page 97 2 Switching No. 3 compressor from operation to stopping When the required performance is exceeded with the No. 1 and No. 2 variable capacity unit compressors and the constant capacity unit No. 3 compressor in operation, the No. 3 compressor will be stopped. 3) Pressure control •...
  • Page 98 (4) Bypass - capacity control The solenoid valves have bypass valves (SV1, SV4 and SV6) that allow bypassing of the high pressure and low pressure sides and solenoid valves (SV22 and SV32) that control the capacity valve inside the compressor. Those operation are as follows.
  • Page 99 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] <Variable capacity unit> Item At compressor is started ON for 4 minutes — Compressor stopped during cool- — ing or heating mode After operation has been stopped ON for 3 minutes —...
  • Page 100 <Constant Capacity Unit> Item At compressor is started ON for 4 minutes — After thermostat reset or 3 ON for 4 minutes — minutes after startup Compressor stopped during ON for 3 minutes — cooling or heating mode ON for 3 minutes —...
  • Page 101 (5) Oil return control (Electronic expansion valve (SLEV); Variable Capacity Unit only) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
  • Page 102 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. •...
  • Page 103 (10) Liquid Distribution Control (electronic expansion valve (LEV2) constant capacity unit only) • Liquid distribution control refers to the process by which liquid refrigerant returning from the constant and variable capacity units during heating is equally distributed, and the opening of the constant capacity unit LEV2 is adjusted so that there is no deficiency of liquid refrigerant in the accumulator of each unit.
  • Page 104 (11) Liquid Refrigerant Correction Control The liquid refrigerant correction control adjusts the liquid refrigerant amounts between both accumulators in the unlikely event that the liquid refrigerant amount in both the constant and variable capacity unit accumulators should be insufficient, or if and excessive amount of liquid refrigerant is returned from either accumulator. During this operation, Service LED No.
  • Page 105 (12) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery 1 Refrigerant recovery is started when the two items below are fully satisfied. •...
  • Page 106 (14) Control at initial starting • When the ambient temperature is low (5°C or less in cooling and – 5°C or less in heating), initial starting will not be performed even if the unit is started within 4 hours of the power being turned on. •...
  • Page 107 <Initial Start Control Timingchart> For steps 1 - 3 (Example 1) End of initial operation mode minutes 30 minutes 10 minutes 5 minutes ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 (Example 2) End of initial operation mode minutes minutes...
  • Page 108 For steps 4 - 6 (Example 1) minutes End of initial operation mode (A-minute Definitions) A-minute minutes ON/OFF of No.1 compressor Operation Conditions Frequency Level (Hz) Constant capacity unit – power on 7 hours. minute ON/OFF of No.2 compressor 217 (For variable capacity [ET or EPT-{(F-22)/22}] unit model 500) 1°C...
  • Page 109 (Example 4) Less than Less than minutes minutes minutes End of initial operation mode 10 minutes 10 minutes A-minute minutes ON/OFF of No.1 compressor ON/OFF of No.2 compressor Note 3 ON/OFF of Step 4 No.3 compressor Step 6 Step 5 Step 6 Step 5 Step 4...
  • Page 110 (17) Emergency response operating mode The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when the compressors (No. 1, No. 2) break down, making it possible to carry out a trouble reset using the remote control. 1) Starting the Emergency Operation Mode 1 Trouble occurs (Display the trouble code root and trouble code on the remote control).
  • Page 111 2) Terminating Emergency Response Operation Mode (Termination Conditions) When one of the following conditions is met, emergency operation mode is terminated. 1 Cumulative compressor operation time in the cooling mode exceeds 4 hours. 2 Cumulative compressor operation time in the heating mode exceeds 2 hours. 3 Emergency operation mode trouble detected.

  • Page 112: Operation Flow Chart

    [2] Operation Flow Chart (1) Outdoor unit (Cooling, heating modes) Start Normal operations Breaker turned on Trouble observed Stop “HO” blinks on the remote control- Note: 1 Set indoor address No. to remote controller Operation command Oil return LEV, SC coil LEV fully closed Operation mode...
  • Page 113 (2) Indoor unit (Cooling, heating, dry, and fan modes) Start Normal operations Trouble observed Breaker turned on Stop Operation SW turned on Note: 1 1. Protection function self-holding cancelled. 2. Indoor unit LEV full closed. Note: 2 Remove controller display extinguished Error mode Operation mode Error stop...
  • Page 114 (3) Cooling operation Cooling operation Normal operations 4-way valve OFF Test run Stop Note: 1 Indoor unit fan operations Test run start Thermostat ON 3-minute restart pre- vention Variable capacity unit Variable capacity unit 1. Inverter output 0 Hz 1. Inverter frequency level control 2.
  • Page 115 (4) Heating operation Normal operations Heating operation Defrosting operations Note: 1 Stop Test run Defrosting operation During constant 4-way valve ON capacity unit operation or Operation over 30 minutes before stopping the constant capacity unit. Test run start Variable capacity unit 4-way valve OFF Variable capacity unit 4-way valve OFF Constant capacity unit 4-way valve ON Constant capacity unit 4-way valve ON...
  • Page 116 (5) Dry operation Dry operations Normal operations Thermostat ON 4-way valve OFF Stop Test run start Note: 2 Thermostat ON Inlet temp. 18°C Note: 1 Variable capacity unit 1. Outdoor unit (Compressor) intermit- 1. Inverter output 0 Hz tent operations 2.

  • Page 117: List Of Major Component Functions

    [3] List of Major Component Functions Code Name Product code Application Specification Inspection method (Function) Electronic 1 Adjustment of super heat of heat ex- DC 12 V Perform a continuity check using a tester. expansion changer outlet port of indoor unit Amount of opening of the Conductivity among valve...
  • Page 118 Code Name Product code Application Specification Inspection method (Function) Thermistor = 15 kΩ Resistance check Detects liquid level of refrigerant inside = 3460 accumulator using the differences 1/80 (Liquid level Rt = among TH2, TH3, TH4. detection) 15exp{3460( 273+t 1 Frequency control. 0°C: 15 kΩ...
  • Page 119 Code Name Product code Application Specification Inspection method (Function) Solenoid Controls heat exchanger capacity of AC 220 to 240 V Conductivity test SV5b heat vallve outdoor unit. Close: conducting using tester. exchanger capacity Open : not conducting control Evaporation of liquid refrigerant inside AC 220 to 240 V MC2.
  • Page 120 Code Name Product code Application Specification Inspection method (Function) 1 Detects the outdoor air temperature. Themist = 15 kΩ Resistance check 2 Performs fan control, liquid level (Outdoor = 3460 0/80 temperature) control, and oil-return LEV opening settings. 15exp{3460( 273+t Controls LEV1 using temperature 0°C: 15 kΩ...

  • Page 121: Resistance Of Temperature Sensor

    [4] Resistance of Temperature Sensor Thermistor for low temperature = 15 kΩ ± 3 % (TH3 ~ 9a, 9b,10a,10b) = 7.465 kΩ ± 2 % (TH11, 12, 10c) Thermistor R Thermistor R Rt = 15exp {3460 ( Rt = 7.465exp {4057 ( 273+120 273+t 273+0...

  • Page 122: Refrigerant Amount Adjustment

    6 6 6 6 6 REFRIGERANT AMOUNT ADJUSTMENT By clarifying the relationship between the refrigerant amount and operating characteristics for Super Y Series, conduct service activities such as decision on the amount and adjustment of refrigerant on the market. [1] Operating Characteristics and Refrigerant Amount The followings are operating characteristics and refrigerant amount which draw special attention.
  • Page 123 (2) Refrigerant Volume 1) Checking the Operating Condition Operate all the indoor units on cooling or on heating, checking the discharge temperature, sub-cooling, low pressure saturation temperature, inlet temperature, shell bottom temperature, fluid level, fluid step, etc. and rendering an overall judgment.
  • Page 124 (3) Additional Refrigerant Charge Volume At the time of shipping from the factory, the outdoor unit is charged with the amount of refrigerant shown in the following table, but since no extension piping is included, please carry out additional charging on-site. Variable Capacity Unit Constant Capacity Unit Outdoor Unit Model...

  • Page 125: Refrigerant Volume Adjustment Mode Operation

    [3] Refrigerant Volume Adjustment Mode Operation (1) Procedure Depending on the operating conditions, it may be necessary either to charge with supplementary refrigerant, or to drain out some, but if such a case arises, please follow the procedure given below. Switching the function select switch (SW2-4), located on the outdoor unit’s control board, ON starts refrigerant volume adjustment mode operation and the following operation occurs.
  • Page 126 (2) Refrigerant adjustment in cooling season (Flow chart) PUHY-(P) 400·500 YMF-B Start adjustment Set all indoor units to test run mode and start cooling. Is the liquid level Use the low-pressure service of the accumulator 0 or 16 port to drain out refrigerant minutes or more after a little at a time.
  • Page 127 PUHY-(P) 600·650·700·750 YSMF-B Start adjustment AL1: Variable capacity unit liquid level AL AL2: Constant capacity unit liquid level AL Note: 3 All indoor units begin cooling operations in test run mode. Both constant and variable capacity units are operated. Over 6 minutes have Use the low-pressure service passed since variable and port of AL ≠...
  • Page 128 (3) Refrigerant adjustment in heating season (Flow chart) PUHY-(P) 400·500 YMF-B Start Adjustment Run all the indoor units in the heating condition in the test run mode. Note: 1 AL = 1 or 2 Note: 2 Note: 3 Is the AL = 2 Has the operating accumulator's liquid level...
  • Page 129 PUHY-(P) 600·650·700·750 YSMF-B –126–...
  • Page 130 Note: 1 If there are any units which are not operating, it will cause refrigerant to accumulate, so by all means operate all the indoor units. Also, in order to prevent stable operation from being disrupted by the thermostat going OFF, set the trial operation mode.
  • Page 131 (4) R22 Gauge pressure - saturation temperature conversion chart G — °C kg/cm → Pressure ↓ – 25.2 – 24.0 – 22.8 – 21.7 – 20.7 – 19.6 – 18.6 – 17.6 – 16.7 – 15.7 – 14.8 – 14.0 –...

  • Page 132: Troubleshooting

    7 7 7 7 7 TROUBLESHOOTING [1] Principal Parts (1) Judging Failure Pressure Sensor (Discharge/Suction Pressure Sensor) 1) Check for failure by comparing the sensing pressure according to the high pressure/low pressure sensor and the pressure gauge pressure. Turn on switches 2, 4, 5, 6 (High) and 1, 2, 4, 5, 6 of the digital display select switch (MAIN board SW1) as shown below, and the pressure sensor is displayed digitally by the light emitting diode LD1.
  • Page 133 2) SV22, SV32 (Full load/unload switching valve) (All but model PUHY-400YMF-B) 1 The No. 1 compressor is started first and operates for approximately 10 minutes and then the No. 2 compressor starts in the unload mode.
  • Page 134 5) SV6 When No. 2 compressor is operating and No. 2 compressor is stopped, the main SV6 will be set to ON, making it possible to confirm operation by monitoring the LED display and listening to the operating sound. Note that it may be set to OFF if the outlet temperature (TH11) exceeds 120°C .
  • Page 135 2) SV2, 3 (Full-load / Un-load switching valve) PUHN-P-YMF-B only 1 It starts in un-load in the initial start mode and during defrosting, and starts in full-load at all other times. 2 It is possible to determine whether or not the compressors are switching from unload to full load by check the changes in amperage of the compressor at the moment of switching.
  • Page 136 Outdoor LEV The valve opening angle changes in proportion to the number of pulses. (Connections between the outdoor unit’s MAIN board and SLEV, LEV1, LEV2 (outdoor electronic expansion valve).) Driver Circuits Outdoor MAIN Board (Connectors CNLV1, CNLV2) 1 SLEV, LEV1 Pulse Signal Output and Valve Operation Output pulses change in the following orders when the Output (Phase)
  • Page 137 2 LEV2 Pulse Signal Output and Valve Operation Output (Phase) Output State Output pulses change in the following orders when the ø1 OFF OFF ON 1 → 2 → 3 → 4 → 1 ø2 ON OFF OFF Valve is Closed ON OFF ø3 4 →...
  • Page 138 Judgment Methods and Likely Failure Mode Caution The specifications of the outdoor unit (outdoor LEV) and outdoor units (indoor LEV) differ. For this reason, there are cases where the treatment contents differ, so follow the treatment specified for the appropriate LEV as indicated in the right column.
  • Page 139 Outdoor LEV (SLEV, LEV1) Coil Removal Procedure (configuration) As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Stopper Coils Indentation for Stopper (12 places around the circumference) Lead Wires <Removing the Coils>...
  • Page 140 Power transistor Measure resistances between each terminal of transistor module with tester, and use the results for troubleshooting. Specified resistance value is dependent on tester type to be used for resistance measurement, because diode transis- tor has non-linearity, thus difference of impedance and voltage in tester being influential. As the internal impedance of resistance range of analog tester equals to the center value of meter indication, the affect of internal impedance can be minimized if the tester having close center value of resistance range.
  • Page 141 Thyristor module (SCRM) <Judgment Method> Measure the resistance between each of the SCRM pins and judge if there is a failure or not by the resulting values. <Judgment Values 1> Check between G and K. Use the smallest resistance range on the tester. Judgment Value: 1.5 Ω...
  • Page 142 (2) Trouble and remedy of remote controller Symptom Cause Checking method & countermeasure Despite pressing of re- 1) M-NET transmission power source is not supplied a) Check transmission terminal block of re- mote controller switch, from outdoor unit. mote controller for voltage. 1 Main power source of outdoor unit is not connected.
  • Page 143 Symptom Cause “HO” display on re- (Without using MELANS) mote controller does 1) Outdoor unit address is set to “000.” not disappear and 2) Erroneous address. switch is ineffective. 1 Address setting miss of indoor unit to be coupled with remote controller. (Indoor unit address = Remote controller address –...
  • Page 144 Symptom Cause Checking method & countermeasure “88” appears on re- [Generates at registration and confirmation] a) Confirm the address of unit to be coupled. mote controller at the b) Check the connection of transmission line. 1) Erroneous address of unit to be coupled. registration and access c) Check the transmission terminal block voltage 2) Slipping off of transmission line of unit to be cou-...
  • Page 145 Transmission Power Circuit (30 V) Check Procedure If “ ” is not displayed by the remote control, investigate the points of the trouble by the following procedure and correct it. Check Item Judgment Response Disconnect the transmission line from TB3 DC 24 ~ 30 V Check the transmission line for the following, and and check the TB3 voltage.
  • Page 146 (3) Investigation of transmission wave shape/noise Control is performed by exchanging signals between outdoor unit, indoor unit and remote controller by M-NET trans- mission. If noise should enter into the transmission line, the normal transmission will be hindered causing erroneous operation.
  • Page 147 3) Checking and measures to be taken (a) Measures against noise Check the items below when noise can be confirmed on wave shape or the error code in the item 1) is generated. Items to be checked Measures to be taken 1 Wiring of transmission and power lines Isolate transmission line from power line (5 cm or more).
  • Page 148 4) Treatment of Inverter and Compressor Troubles If the compressor does not work when error codes 4210, 4240, 4310 or 4340 are detected, determine the point of malfunction by following the steps in the LED monitor display and countermeasures depending on the check code displayed, then perform the procedures below.
  • Page 149 5) Treatment of Fan Motor Related Troubles Condition Possible Cause Check Method and Treatment 1 It won’t run for 20 1) The power supply If there is an open phase condition before the breaker, minutes or longer when voltage is abnormal. after the breaker or at the power supply terminal blocks the AK value is 10 %.
  • Page 150 6) Troubleshooting at breaker tripping Check items Measures to be taken 1 Check the breaker capacity. The breaker’s capacity should be proper. 2 Check the a short circuit or grounding in the electrical Correct any defects. system other than the inverter. 3 Check the resistance between terminals on the terminal Check each part inside power circuit (resistance, block TB1 for power source.
  • Page 151 7) Individual Parts Failure Judgment Methods. Part Name Judgment Method Diode Stack (DS) Refer to “Judging Diode Stack Failure.” Transistor Module (TRM) Refer to “Judging Transistor Module Failure.” Thyristor Module (SCRM) Refer to “Judging Thyristor Module Failure.” Electromagnetic Contactor Measure the resistance value at each terminal. (52C1, 52C2, 52F) 1/L1 3/L2 5/L3 Check Location...
  • Page 152 Model PUHY-400YMF-B, 500YMF-B –149–...
  • Page 153 (10) Heat up the soldered portions of the discharge piping, suction piping, volume control valve piping (All but model PUHY-400YMF-B) and process piping (All but model PUHY-400YMF-B) and disconnecting the piping. (11) Remove the compressor mounting nuts and mounting fitting 2 (4 places on the No. 2 compressor only), then remove the compressor.
  • Page 154 (13) Solder the discharge piping, suction piping, volume control valve piping (All but model PUHY-400YMF-B) and process piping (All but model PUHY-400YMF-B). (14) Attach the oil equalization pipe to both compressors. In the case of the PUHY-P-YMF-B, replace the dryer with a new one.
  • Page 155 Parts around the oil equalization pipe. Flare Nut Dryer (PUHY- P-YMF-B only) No2. Compressor No.1 Compressor Belt Heater Flare Nut Belt Heater Compressor shell temperature sensor Fastening Oil Equalization Oil Drain (TH10c, PUHY-P-YMF-B only) Fitting 1 Pipe Outlet Insulation + Discharge Discharge Pipe Temperature Sensor Connection...
  • Page 156 Around the No.2 Compressor (PUHY-400YMF-B) Outlet Pipe Joint Suction Pipe Joint (c) Type 400 only Belt Heater Mounting nuts Mounting fittings 2 Around the No. 2 Compressor (All but model PUHY-400 YMF-B) (d) All but model Pipe joints for Process Pipe...
  • Page 157 Constant Capacity Unit Observe the following notes when changing the compressor (1) Make sure the main power supply is turned off. If the reason for the compressor replacement is faulty insulation resistance, if the insulation resistance (Mega- check) is 1 MΩ or greater, it is possible that it has dropped due to the dormancy of the refrigerant to the compres- sor, so after turning on the power for 12 hours with a belt heater heating, turn off the power and check the insulation resistance again.
  • Page 158 Pipe joints for Volume Control Process pipe (PUHN-P-YMF-B only) Terminal cover Insulation + Discharge thermistor Discharge pipe joint Suction pipe joint Belt heater Mounting fitting –155–...
  • Page 159 Check Code List Check Code Check Content Inverter error detail *1 – 0403 Serial transmission abnoramlity – 0900 Trial operation – 1102 Discharge temperature abnormality – 1111 Low pressure saturation temperature sensor abnormality (TH2) – 1112 Low pressure saturation Liquid level sensing temperature sensor abnormality (TH4) –...
  • Page 160 Check Code Check Content Inverter error detail *1 6607 No ACK abnormality – – 6606 Communications with transmission processor abnormality – 6608 No response abnormality – 7100 Total capacity abnormality – 7101 Capacity code abnormality – 7102 Connected unit count over –...

  • Page 161: Led Monitor Display And Countermeasures Depending On The Check Code Displayed

    [2] LED monitor display and Countermeasures Depending on the Check Code Displayed (1) Mechanical Checking code Meaning, detecting method Cause Checking method & Countermeasure 0403 Serial If serial transmission cannot be 1) Wiring is defective. Check 1, the connections, 2, contact transmission established between the MAIN at the connectors and 3, for broken...
  • Page 162 SV22/32. valve. abnor- 1: Low Pressure Saturation (Full load operation during unload.) mality Temperature error is not de- All but model PUHY-400YMF-B. (TH3) tected for 3 minutes after the 16)Defective operation of solenoid (Outdoor start of compressor opera- valve contactor52C2.
  • Page 163 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1301 Low pressure When press. sensor detects 1) Fall in internal press. caused by gas Refer to Trouble check of pressure abnormality 1 kg/cm G (0.098 MPa) or less leak. sensor.
  • Page 164 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1500 Overcharged A error is detected in the outlet 1) Excessive refrigerant charge. Refer to Refrigerant amount check. refrigerant temperature super heat (TH11, 2) Broken wire of liquid level heater. abnomality 12-Tc) and in the liquid level in the 3) Poor heater output caused by con-...
  • Page 165 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1505 Suction • R22 refrigerant models: • Operation due to accidental failure to If there has been suction pressure er- pressure 1 If it has been determined by open the ball valve, especially the ball ror, do not restart operation by reset- abnormality the high pressure pressure,...
  • Page 166 Checking code Meaning, detecting method Cause Checking method & Countermeasure 2500 Leakage (water) When drain sensor detects flood- 1) Water leak due to humidifier or the Check water leaking of humidifier and abnormality ing during drain pump OFF. like in trouble. clogging of drain pan.
  • Page 167 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1 Cannot operate because the 4106 Power off 1) Power cord problem Measure the voltage in each part of abnormality constant capacity unit is dis- (constant capacity unit is discon- the constant capacity unit 1 Power source terminal block (TB1) (Variable...
  • Page 168 Checking code Meaning, detecting method Cause Checking method & Countermeasure 4116 Fan speed Detects only for PKFY-VAM) 1) Slipping off of fan speed detecting • Confirm slipping off of connector abnormality 1. Detecting fan speed below connector (CN33) of indoor control- (CN33) on indoor controller board.
  • Page 169 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1 If IDC 4210 Breaking of 103 A peak is de- 1) The power supply voltage is abnor- • Check if an instantaneous power overcurrent tected during inverter opera- mal. failure or power failure, etc.
  • Page 170 Checking code Meaning, detecting method Cause Checking method & Countermeasure 4230 Radiator panel If the cooling fan stays ON for 5 1) The wiring is defective. Check 1 connections, 2 contact at the overheat minutes or longer during inverter connectors and 3 for broken wires in protection operation, and if THHS 100°C...
  • Page 171 Checking code Meaning, detecting method Cause Checking method & Countermeasure Cooling fan 4260 If the heat sink temperature (THHS) 1) Same as “4230.” Same as “4230.” abnormality 60°C for 18 minutes or longer just (Variable before the inverter starts. capacity unit) 5101 Discharge 1 Detects thermistor short (high...
  • Page 172 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1 When pressure sensor detects Refer to Troubleshooting of pres- 5201 Pressure 1) Pressure sensor trouble. sensor 1 kg/cm G (0.098 MPa) or less sure sensor. abnormality during operation, outdoor unit (Variable once stops with 3 minutes re- 2) Inner pressure drop due to a leak-...
  • Page 173 (2) Communication/system Checking Meaning, detecting method Cause Checking method & Countermeasure code 6600 Multiple address error 1) Two or more controllers of outdoor At the genration of 6600 error, release the error by unit, indoor unit, remote controller, remote controller (with stop key) and start again. Transmission from units with the etc.
  • Page 174 Checking Meaning, detecting method Cause Checking method & Countermeasure code 6602 Transmission processor hard- Checking method and processing ware error Transmission line Shut off the power source of outdoor/ installed while turning indoor units and make it again. power source on? Check power source of indoor unit Erroneous power...
  • Page 175 Checking Meaning, detecting method Cause Checking method & Countermeasure code 6606 Communications with trans- 1) Data is not properly transmitted due Turn off power sources of indoor unit and outdoor mission processor error to casual errouneous operation of unit. the generating controller. Communication trouble between 2) Faulty generating controller.
  • Page 176 Meaning, detecting method 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side controller, the transmission side detects error. Note) The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 177 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side (continued) controller, the transmission side detects error. Note) The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 178 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side (continued) controller, the transmission side detects error. Note) The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 179 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side (continued) controller, the transmission side detects error. Note) The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
  • Page 180 Checking Meaning, detecting method Cause Checking method & Countermeasure code 6608 No response error 1) At the collision of mutual transmis- a) Generation at test run sion data when transmission wiring Turn off the power sources of OC unit, IC unit Though acknowledgement of re- is modified or the polarity is changed and Fresh Master for more than 5 minutes si-...
  • Page 181 Checking Meaning, detecting method Cause Checking method & Countermeasure code 7105 Address setting error 1) Setting error of Outdoor unit address Check that the address of Outdoor unit is being set • Erroneous setting of Outdoor The address of Outdoor unit is not to 51 ~ 100.

  • Page 182: Led Monitor Display

    [3] LED Monitor Display (1) How to read LED for service monitor By setting of DIP SW1-1 ~ 1-8 and SW4-2, the unit operating condition can be observed with the service LED on the MAIN board on Variable capacity unit. (For the relation of each DIP SW to the content, see the table provided. Constant capacity unit operation can also be checked if SW4-2 = ON.) As shown in the figure below, the LED consist of 7 segments is put in 4 sets side by side for numerical and graphic display.
  • Page 183 1 Variable capacity unit (SW4-2 OFF) Item Display Remarks 12345678910 0000000000 Relay Output COMP COMP1 52C2 21S4a SV 22/ Lights for LD8 is a relay output Display 1 (Light up Operating Operating Normal indicator which lights to display) Operation up at all times when the microcomputer’s Check Display 1 0000 ~ 9999...
  • Page 184 Variable capacity unit Item Display Remarks 12345678910 1010100000 Outdoor Unit High — No. 1. No. 2 No. 1 No. 2 Heat Sink Lights up if an error Preliminary Error Pressure Pressure Discharge Discharge Over- Over- Thermo- delay has occurred History Error 1, 2 Error Tempera-...
  • Page 185 Variable capacity unit Item Display Remarks 12345678910 0010110000 TH6 Data – 99.9 ~ 999.9 ↑ 1010110000 TH7 Data ↑ 0110110000 TH8 Data ↑ 1110110000 TH9a Data ↑ 0001110000 TH9b Data ↑ 1001110000 TH10c Data ↑ 0101110000 High Pressure Sensor Data ↑...
  • Page 186 When there is an error stop with No101-125, the data on error stops or the data immediately before the error postponement stop, which is stored in service memory, are displayed. Variable capacity unit Item Display Remarks 12345678910 0110101000 IC6 Address/ 0000 ~ 9999 Displayed alternately Capacity Code...
  • Page 187 When there is an error stop with No101-125, the data on error stops or the data immediately before the error postponement stop, which is stored in service memory, are displayed. Variable capacity unit Item Display Remarks 12345678910 αOC 0010111000 0 ~ 9.999 αOC* ↑...
  • Page 188 Variable capacity unit Item Display Remarks 12345678910 0111000100 IC15 Room – 99.9 ~ 999.9 Temperature ↑ 1111000100 IC16 Room Temperature ↑ 0000100100 IC1 Liquid Pipe Temperature ↑ 1000100100 IC2 Liquid Pipe Temperature ↑ 0100100100 IC3 Liquid Pipe Temperature ↑ 1100100100 IC4 Liquid Pipe Temperature ↑...
  • Page 189 Variable capacity unit Item Display Remarks 12345678910 0011010100 IC13 Gas Pipe Temperature – 99.9 ~ 999.9 ↑ 1011010100 IC14 Gas Pipe Temperature ↑ 0111010100 IC15 Gas Pipe Temperature ↑ 1111010100 IC16 Gas Pipe Temperature ↑ 0000110100 IC1 SH ↑ 1000110100 IC2 SH ↑...
  • Page 190 Variable capacity unit Item Display Remarks 12345678910 0000101100 IC1 LEV Opening 0000 ~ 9999 Pulse ↑ 1000101100 IC2 LEV Opening Pulse ↑ 0100101100 IC3 LEV Opening Pulse ↑ 1100101100 IC4 LEV Opening Pulse ↑ 0010101100 IC5 LEV Opening Pulse ↑ 10101011000 IC6 LEV Opening Pulse...
  • Page 191 Variable capacity unit Item Display Remarks 12345678910 1101011100 IC12 Operation 0: Stop Mode 1: Fan 2: Cooling 0011011100 IC13 Operation 3: Heating Mode 4: Dry 1011011100 IC14 Operation Mode 0111011100 IC15 Operation Mode 1111011100 IC16 Operation Mode 0000111100 IC1 Filter 0000 ~ 9999 ↑...
  • Page 192 Variable capacity unit Item Display Remarks 12345678910 0111000010 1111000010 0000100010 1000100010 0100100010 1100100010 0010100010 1010100010 0110100010 1110100010 0001100010 1001100010 0101100010 1101100010 0011100010 1011100010 0111100010 1111100010 0000010010 1000010010 0100010010 1100010010 0010010010 1010010010 0110010010 1110010010 0001010010 1001010010 0101010010 1101010010 0011010010 1011010010 0111010010 1111010010 0000110010 1000110010...
  • Page 193 Variable capacity unit Item Display Remarks 12345678910 1010110010 0110110010 1110110010 0001110010 1001110010 0101110010 1101110010 0011110010 1011110010 0111110010 1111110010 0000001010 1000001010 0100001010 1100001010 0010001010 1010001010 0110001010 1110001010 0001001010 1001001010 0101001010 1101001010 0011001010 1011001010 0111001010 1111001010 0000101010 IC17 Address/ Displayed alternately 1000101010 0000 ~ 9999 Capacity Code every 5 seconds.
  • Page 194 Variable capacity unit Item Display Remarks 12345678910 1001101010 IC25 Address/ 0000 ~ 9999 Capacity Code ↑ 0101101010 IC26 Address/ Capacity Code ↑ 1101101010 IC27 Address/ Capacity Code ↑ 0011101010 IC28 Address/ Capacity Code ↑ 1011101010 IC29 Address/ Capacity Code ↑ 0111101010 IC30 Address/ Capacity Code...
  • Page 195 Variable capacity unit Item Display Remarks 12345678910 1011111010 0111111010 1111111010 0000000110 IC17 Room – 99.9 ~ 999.9 Temperature ↑ 1000000110 IC18 Room Temperature ↑ 0100000110 IC19 Room Temperature ↑ 1100000110 IC20 Room Temperature ↑ 0010000110 IC21 Room Temperature ↑ 1010000110 IC22 Room Temperature ↑...
  • Page 196 Variable capacity unit Item Display Remarks 12345678910 ↑ 0001100110 IC25 Liquid Pipe Temperature ↑ 1001100110 IC26 Liquid Pipe Temperature ↑ 0101100110 IC27 Liquid Pipe Temperature ↑ 1101100110 IC28 Liquid Pipe Temperature ↑ 0011100110 IC29 Liquid Pipe Temperature ↑ 1011100110 IC30 Liquid Pipe Temperature ↑...
  • Page 197 Variable capacity unit Item Display Remarks 12345678910 ↑ 0100110110 IC19 SH ↑ 1100110110 IC20 SH ↑ 0010110110 IC21 SH ↑ 1010110110 IC22 SH ↑ 0110110110 IC23 SH ↑ 1110110110 IC24 SH ↑ 0001110110 IC25 SH ↑ 1001110110 IC26 SH ↑ 0101110110 IC27 SH ↑...
  • Page 198 Variable capacity unit Item Display Remarks 12345678910 ↑ 0110101110 IC23 LEV Opening Pulse ↑ 1110101110 IC24 LEV Opening Pulse ↑ 0001101110 IC25 LEV Opening Pulse ↑ 1001101110 IC26 LEV Opening Pulse ↑ 0101101110 IC27 LEV Opening Pulse ↑ 1101101110 IC28 LEV Opening Pulse ↑...
  • Page 199 Variable capacity unit Item Display Remarks 12345678910 0000111110 IC17 Filter 0000 ~ 9999 ↑ 1000111110 IC18 Filter ↑ 0100111110 IC19 Filter ↑ 1100111110 IC20 Filter ↑ 0010111110 IC21 Filter ↑ 1010111110 IC22 Filter ↑ 0110111110 IC23 Filter ↑ 1110111110 IC24 Filter ↑...
  • Page 200 2 Constant capacity unit (SW4-2 ON) Item Display Remarks 12345678910 SV2, 3 0000000000 Relay Output COMP COMP 1 21S4a Lights for LD8 is a relay output Only for Display 1 (blinking Opera- Operat- Normal indicator which lights display) tion Operation up at all times when PUHN- the microcomputer’s...
  • Page 201 Constant capacity unit Item Display Remarks 12345678910 1001100000 0101100000 1101100000 0011100000 1011100000 0111100000 1111100000 0000010000 1000010000 0100010000 1100010000 0010010000 1010010000 0110010000 1110010000 0001010000 1001010000 0101010000 1101010000 0011010000 1011010000 0111010000 TH11 Data – 99.9 ~ 999.9 1111010000 0000110000 1000110000 TH3 Data –...
  • Page 202 Constant capacity unit Item Display Remarks 12345678190 0000001000 Accumulator level 0 ~ 9 (“AL =” is also displayed) 1000001000 TH10a – 99.9 ~ 999.9 ↑ 0100001000 TH10b 1100001000 0010001000 1010001000 0110001000 1110001000 0001001000 1001001000 0101001000 0000 ~ 9999 ↑ 1101001000 LEV2 ↑...
  • Page 203 When there is an error stop with No101-125, the data saved in the service memory immediately before the error is displayed. Constant capacity unit Item Display Remarks 12345678910 1010011000 Relay Output COMP 52C1 21S4 Display 1 (blinking Opera- display) tion 0110011000 Relay Output SB5b...
  • Page 204 Service Handbook PUHY-400YMF-B, 500YMF-B PUHY-P400YMF-B, P500YMF-B PUHY-600YSMF-B, 650YSMF-B, 700YSMF-B, 750YSMF-B PUHY-P600YSMF-B, P650YSMF-B, P700YSMF-B, P750YSMF-B HEAD OFFICE MITSUBISHI DENKI BLDG. MARUNOUCHI TOKYO 100-8310 TELEX J24532 CABLE MELCO TOKYO Issued in Jan. 2000 MEE99K045 New publication effective Jan. 2000. Printed in Japan...

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