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Mitsubishi Electric PUH-P8YE Technical & Service Manual
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Mitsubishi Electric PUH-P8YE Technical & Service Manual

Mitsubishi Electric PUH-P8YE Technical & Service Manual

Single and twin/triple/four, outdoor unit, heat pump type packaged
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AIR-COOLED HEAT PUMP TYPE
PACKAGED AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
<Outdoor unit>
Models
PUH-P8YE, PUH-P10YE
(Single and Twin/Triple/Four)
For use with the R407
2000

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  • Page 1 2000 AIR-COOLED HEAT PUMP TYPE PACKAGED AIR CONDITIONERS TECHNICAL & SERVICE MANUAL <Outdoor unit> Models PUH-P8YE, PUH-P10YE (Single and Twin/Triple/Four) For use with the R407...

  • Page 2: Table Of Contents

    Contents Page 1 1 1 1 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 ..........................

  • Page 3: 1 1 1 1 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 4: 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 5: 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 6: 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 7: 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 8: 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 9: 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 10: 2 2 2 2 Specifications

    2 2 2 2 2 SPECIFICATIONS Specifications of air-source heat pump type packaged air conditioner (Outdoor unit) PUH-P8YE Model name Quantity Cooling Heating 18,000 20,400 kcal/h Capacity 20.9 23.7 Power source 3N~ 380/400/415 V 50 Hz Power input 7.27 7.17 13.0...
  • Page 11 Specifications of air-source heat pump type packaged air conditioner (Outdoor unit) PUH-P10YE Model name Quantity Cooling Heating 22,400 26,200 kcal/h Capacity 26.0 30.5 Power source 3N~ 380/400/415 V 50 Hz Power input 9.02 8.62 16.0 15.4 Current Propeller fan × 1 Type x Quantity Airflow rate /min...

  • Page 12: 3 3 3 3 External Dimensions

    3 3 3 3 3 EXTERNAL DIMENSIONS Unit: mm • Models PUH-P8YE/P10YE –10–...

  • Page 13: 4 4 4 4 Electrical Wiring Diagram

    To indoor unit Power source 380/400/415 V 50 Hz Symbol Explanation Symbol Name NOTE SW5-4 IS OFF IN CASE OF PUH-P8YE. F1, F2 FUSE (15A 250VAC CLASS T) SW5-4 IS ON IN CASE OF PUH-P10YE. F01~F04 FUSE (6.3A 250VAC CLASS F) F10~F30 FUSE (6.3A 250VAC CLASS F)

  • Page 14: Skelton Of Indoor/Outdoor Connection

    [2] Skelton of Indoor/Outdoor Connection (1) Applicable combinations of 8 & 10HP [PUH-P8/P10YE] Single 50 : 50 33 : 33 : 33 25 : 25 : 50 20 : 40 : 40 25 : 25 : 25 : 25 2.5HP+2.5HP 2HP+2HP 1.6HP+3HP 2HP+2HP...

  • Page 15: 5 5 5 5 Technical Data Of Puh-8/10Yd To Meet Lvd

    5 5 5 5 5 Technical Data of PUH-8/10YD to Meet LVD [1] Standard Operation Data 1 PUH-P8YE Operating condition Cooling Heating Voltage Power source frequency °C Indoor air condition (DB/WB) 27/19 27/19 27/19 20/– 20/– 20/– °C Outdoor air condition (DB/WB) 35/- 35/–...

  • Page 16: Cooling Capacity Curves

    [2] Cooling Capacity Curves • PUH-P8YE/P10YE 1.22 -5 -3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 -5 -3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 Outdoor air temp.

  • Page 17: Capacity Reduction Ratio Due To Changes In Piping Length

    [4] Capacity Reduction Ratio due to Changes in Piping Length (1) Cooling capacity PUH-P8YE PUH-P10YE Equivalent piping length (m) Equivalent piping length (m) (2) Heating capacity Equivalent piping length Model name - 30 m 30 - 50 m 50 - 70 m PUH-P8YE 0.995...

  • Page 18: Center Of Gravity (Outdoor Unit)

    Service panel Compressor position Suspending spot 2-point,front and rear Fasten here properly to prevent unit from slipping off from the sling at lifting. Center of gravity (mm) Item Net weight (kg) Model name PUH-P8YE PUH-P10YE –16–...

  • Page 19: Nc Curve (Outdoor Unit)

    [6] NC Curve (Outdoor unit) (1) Octave Band Analysis 1 PUH-P8YE 63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz (dB) Measurement condition NC60 NC50 NC40 Sound pressure level in anechoic room NC30 56 dB (A) NC20 Approximate minimum audible limit on...

  • Page 20: 6 6 6 6 Service Data

    6 6 6 6 6 SERVICE DATA [1] Appearance of Equipment • PUH-P8YE/P10YE Detail of Electrical Parts Box (with cover removed) (with Main Board Panel removed) Transformer F. C. BOARD MAIN BOARD Over current relay Terminal block for <51C> outdoor/indoor...
  • Page 21 • PUH-P8YE/P10YE (Detail of machine room) Thermistor <condenser/evaporator temp.> TH3 (At the back of the heat exchanger panel (header cover). When this screw is removed, the header cover is removed.) Thermistor <Liquid temp.> 4way valve Pressure switch Accumulater (63H2) Pressure...

  • Page 22: Refrigerant Circuit

    [2] Refrigerant Circuit Outdoor unit Service port Strainer Outdoor heat exchanger Ball valve High pressure switch (Protection) High pressure Service port switch (Control) Strainer Service port Solenoid valve Indoor heat exchanger Muffler Indoor units Compressor Accumulator Electric expansion valve Service port Strainer Capillary tube Ball valve...

  • Page 23: Refrigerant Piping

    [4] Refrigerant Piping Model Gas pipe Liquid pipe PUH-P8YE ø25.4 ø 12.7 Outdoor unit PUH-P10YE ø 28.58 ø 12.7 1.6, 2, 2.5, 3 ø 15.88 ø9.52 4, 5 ø19.05 ø 9.52 Indoor unit ø 25.4 ø 12.7 ø28.58 ø 12.7...

  • Page 24: 7 7 7 7 Control

    7 7 7 7 7 CONTROL [1] Composition of Control 1 Function block diagram Magnetic Over current Compressor contractor relay 380/400/415 V 50 Hz Fuse outdoor Fuse Transformer Fuse 4-way valve, LEV, DC5V for Semiconductor solenoid valve, microcomputer relay crankcase heater Communication circuit Outdoor fan...

  • Page 25: Control Specifications

    [2] Control specifications (1) Protection functions 1) The main protection devices for the outdoor unit are: 1 High pressure protection (63H1) 2 Compressor overcurrent protection (51C) 3 Liquid temp thermistor trouble (TH1) 118 °C) = > 4 Discharge temperature protection (TH2 5 Discharge temp thermistor trouble (TH2) 6 Condenser/evaporater temp thermistor trouble (TH3) 7 Low pressure protection (63L)
  • Page 26 (3) Fan control Controls the fan speed based on the piping temperature (TH1) to perform cooling at low outdoor temperatures and heating at high outdoor temperatures. 1) Control at cooling 1 When the compressor stops, the fan stops (fan output = 0 %). 2 When the power is turned on, or when the compressor is restated after it has been stopped for 30 minutes or longer, the piping temperature ( TH1) determines the fan output.
  • Page 27 2) Control at heating 1 When the compressor is stopped and during defrosting, the fan is stopped. 2 When the power is turned on, or when the compressor is restarted after being stopped for 30 minutes or longer, the piping temperature (TH1) determines the fan step. TH1 >...
  • Page 28 (5) Bypass solenoid valve control (SV1) 1) Control at cooling 1 While the compressor is stopped, the solenoid valve is OFF. 2 When the power is turned on, or when the compressor is restarted after it has been stopped for 30 minutes or longer, if the liquid temperature (TH1) in 25 °C or higher then the solenoid valve turns ON for 2 minutes.

  • Page 29: Function Of Switches And Connectors (Outdoor Unit)

    Cooling only switching Cooling only Heat pump When power turned on Model setting PUH-P10YE PUH-P8YE 2) Switch functions at set mode change Set input mode CN33 = short SW3 = ON* Kind of Operation by switch operation Switch effective Switch...
  • Page 30 Serial communication abnormal (M-NET) E0-E7 Communication other than outdoor unit abnormal Input circuit faulty • PUH-P8YE/P10YE Display Check contents (operating) Compressor discharge temperature abnormal, CN23 short-circuit connector unplugged Compressor discharge temp thermistor (TH2) open/short Liquid temp thermistor (TH1), Condenser/evaporater temp thermistor (TH3) open/short...
  • Page 31 Self diagnosis by SW2 • PUH-P8YE/P10YE SW2 setting Display contents Description of display Unit Liquid temperature –39 - 88 (When 0 °C or lower, “–”and temperature are displayed (TH1) –39 - 88 alternately.) 1 2 3 4 5 6 °C <Example>...
  • Page 32 SW2 setting Display contents Description of display Unit Newest check code When no check mode,“00” Newest outdoor unit <Example> When piping thermistor abnormal U4 abnormality 1 2 3 4 5 6 Code display Check display Operation mode when Operation mode when abnormally stopped abnormality occurred <Example>...
  • Page 33 Outdoor unit set Outdoor unit capacity is displayed as function code. information 1 Model name function code 1 2 3 4 5 6 PUH-P8YE Code display PUH-P10YE Outdoor unit set Outdoor unit set information 1 Function setting (display valves) information 2...
  • Page 34 SW2 setting Display contents Description of display Unit Control mode display system Indoor unit control status Indoor 1, 2 1 2 3 4 5 6 – Indoor unit No.2 Indoor unit No.1 Indoor unit No.4 Indoor unit No.3 Control mode Display Indoor unit Outdoor unit...
  • Page 35 SW2 setting Display contents Description of display Unit Communication de- 0 - 255 mand capacity When communication demand not set: 100 % 0 - 255 (When 100 or higher, 100s digit and 10s and units digits 1 2 3 4 5 6 are displayed alternately.) <Example>...
  • Page 36 SW2 setting Display contents Description of display Unit Thermostat ON time up 0 - 999 to abnormal stop (When 100 or higher, 100s digit and 10s and units digits 0 - 999 are displayed alternately.) 1 2 3 4 5 6 Minutes <Example>...

  • Page 37: Simple Parts Check Method

    [4] Simple parts check method • PUH-P8YE/P10YE Part name Judgment instructions Thermistor (TH1) <Liquid Disconnect the connector and measure the resistance value with a multimeter. (Ambient temperature 10 °C to 30 °C) temperature detection> Thermistor (TH2) Normal Abnormal <Dischargetemperature TH1, 3 4.3 kΩ~9.6 kΩ...

  • Page 38: Reference Data

    [5] Reference Data <Thermistor characteristic table> Low temperature thermistor Thermistor <Liquid temperature detection> (TH1) Thermistor <Condenser/evaporater temperature detection> (TH3) Thermistor <Liquid temperature detection> (TH1) <Low temperature thermistor> Thermistor <Condenser/evaporater temperature detection> (TH3) Thermistor Ro = 15 kΩ ± 3 % B constant = 3,460 kΩ...

  • Page 39: Troubleshooting Of Each Part

    [6] Troubleshooting of each part (1) LEV 1) Overview of LEV operation LEV (electronic expansion valve) receives pulse signals from the outdoor unit main circuit board and drives a valve by means of a servomotor. The valve opening angle changes in proportion to the number of pulses. <Outdoor controller board and LEV>...
  • Page 40 2) Judgment method and probable trouble mode Trouble mode Judgment method Remedy 1 Disconnect the control circuit board connector, and con- nect the check LED shown below. Microcomputer drive cir- When drive circuit faulty, re- cuit faulty place control circuit board. When the mains power is turned on, a pulse signal is out- put for 10 seconds.
  • Page 41 3. Work precautions 3.1 Do not apply abnormal force to the motor. 3.2 Do not use a motor that has been dropped. 3.3 Do not remove the cap until immediately before start- ing work. 3.4 Do not wipe off the molybdenum. Molybdenum Motor 3.5 Do not remove the packing.

  • Page 42: Emergency Operation

    [7] Emergency operation 1) When the following check displays occur at the outdoor unit, or when the wired remote controller or indoor unit microcomputer fails, if there are no other defects, emergency operation is possible by shorting the connector (CN31) on the outdoor controller board.
  • Page 43 4) Emergency operation method * Before starting, recheck that the trouble allows Start emergency operation. Piping work complete? Check that mains power is OFF Turn on emergency operation switch (SWE) on indoor controller board Short CN31 (emergency operation connector) on outdoor controller board Set operation mode (cooling or heating) with SW4-2 on outdoor board (SW4-1 not used) OFF ON...

  • Page 44: Self-Diagnosis And Troubleshooting

    [8] Self-diagnosis and troubleshooting <Abnormality detected at power on> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting 1 Voltage not applied to outdoor unit ter- minal block TB1. a. Check power supply circuit breaker. a.
  • Page 45 <Abnormality detected during unit operation: Outdoor unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting 1 Compressor overheating due to insuf- 1 Check input super heat. Discharge temperature abnormal When the discharge thermistor tem- ficient refrigerant.
  • Page 46 Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Low pressure abnormal (63L trip) 1 Started with ball valve closed. 1 Check if ball valve fully open. Detected by tripping of 63L while the 2 Connector (CN27) on outdoor control- 2 3 Repair connector.
  • Page 47 <Abnormality detected during unit operation: Indoor unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting 1 Thermistor characteristics faulty. Intake sensor abnormal 1) If thermistor open or short is de- 2 Connector contact faulty. Check thermistor resistance value 0 °C ..
  • Page 48 <Abnormality detected during unit operation: Indoor unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting 1 Drain pump trouble. 1 Check drain up mechanism. Drain overflow protection opera- tion 2 Drain faulty. 2 Check drain characteristic. 1) When the drain sensor thermistor Drain pump clogged.
  • Page 49 <Abnormality detected during unit operation: Indoor unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Piping temperature abnormal 1 Indoor intake piping thermistor tem- 1 Operate in test run mode and check pip- <Cool>...
  • Page 50 <Troubleshooting and repair by symptom> Symptom and operation when normal Cause Symptom judgment and remedy 1 DC14 V is not supplied to remote con- 1 Check LED2 on indoor controller board. 1. No remote controller display troller. 1) Steady light (No power O display on liquid crystal Check remote controller wire open or faulty panel.)
  • Page 51 Symptom and operation when normal Cause Symptom judgment and remedy 1 Insufficient refrigerant. 1 - Since the discharge temperature rises when 7. Remote controller display is normal and heating operation is performed 2 Refrigerant piping heat insulation insuffi- there is leakage, judge by measuring the tem- cient.
  • Page 52 <Indoor/outdoor connection wire erroneous wiring and open symptoms> Indoor controller board Remote controller Outdoor controller Erroneous wiring contents Condition LED display Remarks display board LED display LED1 LED2 LED3 Outdoor Indoor side side Trial run “ ” Power Normal Flashing (relocation) supply mark wiring...

  • Page 53: 8 8 8 8 Test Run

    8 8 8 8 8 Test run (1) Test run (For PUH-P8YE/P10YE) The test run can be carried out either from the outdoor unit or the indoor unit. 1. Checklist • After the installation, piping setup, and wiring of the indoor and outdoor units is complete, check that refrigerant is not leaking, the power and control wires are not loose, and the poles are not reversed.
  • Page 54 (2) How to handle problems with the test run (For PUH-P8YE/P10YE) Error code list: details MELANS Remote control- Error details Problem location display ler display Remote controller communication – reception error Remote Controller 6831,6834 Remote controller communication – transmission error...
  • Page 55 • Depending on the position of the SW2 switch on the outdoor unit board, the segments light up to indicate the running condition of the unit and the particulars of the check code. SW2 setting Item Display contents 123456 000000 Operation mode/relay output tens place O: stop...
  • Page 56 The Air Conditioning & Refrigeration Systems Works acquired ISO 9001 certification un- der Series 9000 of the International Standard Organization (ISO) based on a review of Quality warranties for the production of refrigeration and air conditioning equipment. ISO Authorization System The ISO 9000 series is a plant authorization system relating to quality warranties as stipu- lated by the ISO.

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