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Mitsubishi Electric PRH-P8MYA Technical & Service Manual

Air-cooled rooftop packaged air conditioners.
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AIR-COOLED ROOFTOP
PACKAGED AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
<Unit>
HEAT PUMP PRH-P8MYA
Models
PRH-P10MYA
PRH-P16MYA
PRH-P20MYA
2004
For use with the R407C

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Table of Contents

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   Summary of Contents for Mitsubishi Electric PRH-P8MYA

  • Page 1 AIR-COOLED ROOFTOP 2004 PACKAGED AIR CONDITIONERS TECHNICAL & SERVICE MANUAL <Unit> Models HEAT PUMP PRH-P8MYA PRH-P10MYA PRH-P16MYA PRH-P20MYA For use with the R407C...
  • Page 2: Table Of Contents

    Contents Page 1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT ............... [1] Necessary Apparatus and Materials and Notes on Their Handling ..........................[2] Brazing ........................ [3] Airtightness Test ......................... [4] Vacuuming ..................... [5] Charging of Refrigerant 2 TYPICAL INSTALLATION EXAMPLE ..................
  • Page 3 Page ..........................B CONTROL ...................... [1] Composition of Control ......................[2] Control specifications ............[3] Function of switches and connectors (outdoor-side) ............[4] Function of switch on indoor-side controller board ....................[5] Simple parts check method ......................... [6] Reference Data ....................
  • Page 4: Precautions For Devices That Use R407c Refrigerant

    1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT Caution Use ester oil, ether oil or alkylbenzene (small Do not use a charging cylinder. amount) as the refrigerator oil to coat flares and • Using a charging cylinder may cause the refrigerant flange connections.
  • Page 5: Necessary Apparatus And Materials And Notes On Their Handling

    [1] 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 6: Brazing

    [2] 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 7: Airtightness Test

    [3] 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 8: Charging Of Refrigerant

    [5] 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 9: Typical Installation Example

    TYPICAL INSTALLATION EXAMPLE MODEL-DESIGNATION BREAKDOWN P R H P 1 0 M Y A Series symbol Service reference Self-contained type (rooftop type) Design sequence Series symbol Heat pump type Y=3-phase 380V,400V,415V,50Hz,3N~ Refrigerant P=R407C Design sequence Compressor horse power P8=8H P P10=10H P P16=16H P P20=20H P...
  • Page 10: Part Names And Functions

    PART NAMES AND FUNCTIONS Unit Supply air • Return air : Sucks the ambient air in. • Supply air : Blows the air back out into the room. Return air Remote controller (PAR-20MAA) • Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button. [Operation buttons] CENTRALLY CONTROLLED 1Hr.
  • Page 11 [Display] CENTRALLY CONTROLLED 1Hr. ON OFF ßC CLOCK CHECK FILTER CHECK MODE ßC TEST RUN STAND BY ERROR CODE FUNCTION NOT AVAILABLE DEFROST TEMP. ON/OFF Current time/Timer Not available function Centralized control Ventilation Abnormality control Function setting mode Operation mode: COOL, AUTO, Test run mode...
  • Page 12: Specifications

    SPECIFICATIONS Specifications of air-source heat pump type packaged air conditioner (Rooftop unit) Model name PRH-P8MYA PRH-P10MYA Cooling Heating Cooling Heating Mode 20.9 23.7 26.0 30.5 Capacity kcal/h 18,000 19,000 22,400 26,200 71,430 75,400 88,890 104,000 Btu/h Refrigerant R407C Power source...
  • Page 13 Specifications of air-source heat pump type packaged air conditioner (Rooftop unit) Model name PRH-P16MYA PRH-P20MYA Cooling Heating Cooling Heating Mode 41.8 47.4 52.0 61.0 Capacity kcal/h 36,000 40,800 44,800 52,400 142,860 150,800 177,780 208,000 Btu/h Refrigerant R407C Power source 3N~ 380/400/415V 50Hz Electrical Power consumption 16.60...
  • Page 14: Electrical Data

    ELECTRICAL DATA PRH-P8MYA PRH-P10MYA VOLT ITEM Cooling Heating Cooling Heating TOTAL INPUT 8.12 8.02 10.22 9.82 TOTAL RATED CURRENT 14.7 14.5 18.8 18.2 POWER FACTOR START CURRENT COMPRESSOR INPUT 6.96 6.86 8.71 8.31 415V RATED CURRENT 11.9 11.7 14.9 14.3...
  • Page 15: External Dimensions

    EXTERNAL DIMENSIONS • Models PRH-P8MYA/P10MYA - 12 -...
  • Page 16 • Models PRH-P16MYA/P20MYA - 13 -...
  • Page 17: Remote Controller

    REMOTE CONTROLLER • Model PAR-20MAA (Front view) (Side view) (Rear view) - 14 -...
  • Page 18: Electrical Wiring Diagram

    Caution, 2. Color of earth wire is yellow and green twisting. PRH-P10MYA setting. 1. To protect compressor and fan In case of PRH-P8MYA setting is shown as below. motor (indoor-side) from 3. Specification subject to change without notice. 4.This motor( 1) includes auto reset type internal thermostat.
  • Page 19: Skeleton Of Transmission Line Connection

    • Models PRH-P16MYA/P20MYA 63H21 63H22 CONTROL BOX NO.1 CONTROL BOX NO.2 CN3D CN3S CN3N CN24 CN27 CN81 CN51 CN3D CN3S CN3N CN24 CN27 CN81 CN51 TH3-1 TH3-2 DC POWER DC POWER SUPPLY SUPPLY TH2-2 TH2-1 CN34 CN34 TH1-1 TH1-2 OUTDOOR MAIN BOARD OUTDOOR MAIN BOARD ON OFF ON OFF...
  • Page 20: Technical Data To Meet Lvd

    Technical Data to Meet LVD [1] Standard Operation Data (1) PRH-P8MYA 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/– 35/– Refrigerant charge...
  • Page 21 (3) PRH-P16MYA 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/– 35/– Refrigerant charge Total Rated current 29.6 29.6 29.6 29.2 29.2 29.2 Compressor current 23.8 23.8...
  • Page 22: Cooling Capacity Curves

    [2] Cooling Capacity Curves • PRH-P8MYA/P10MYA/P16MYA/P20MYA 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 -5 -3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37...
  • Page 23: Capacity/input Ratio Against Changes In Room Airflow Rate

    [5] Capacity/Input Ratio against Changes in Room Airflow Rate • Model PRH-P8MYA Cooling Heating Capacity Capacity Input Input Input Input Capacity Capacity Airflow rate (m /min) Airflow rate (m /min) • Model PRH-P10MYA Heating Cooling Capacity Capacity Input Input Input...
  • Page 24 • Model PRH-P16MYA Cooling Heating Capacity Capacity Input Input Input Input Capacity Capacity Airflow rate (m /min) Airflow rate (m /min) • Model PRH-P20MYA Cooling Heating Capacity Capacity Input Input Input Input Capacity Capacity 144 150 210 216 144 150 210 216 Airflow rate (m /min)
  • Page 25: Bypass Factor Curves

    0.25 0.15 0.15 0.05 144 150 Airflow rate (m /min) Airflow rate (m /min) [7] Cooling Sensible Heating Capacity Table (1) PRH-P8MYA (Airflow rate 70m /min) (unit : kcal/h) Indoor inlet air temperature (DB/WB°C) Outdoor 23/16 25/18 27/19 28/20 30/22 temp.
  • Page 26 (2) PRH-P10MYA (Airflow rate 90m /min) (unit : kcal/h) Indoor inlet air temperature (DB/WB°C) Outdoor temp. 23/16 25/18 27/19 28/20 30/22 (°C) 22500 18000 24000 17900 19100 25800 19100 27300 18800 24900 21800 17700 23300 17600 18900 25200 18800 26700 18600 24300 21000...
  • Page 27: Fan Performance

    [8] Fan Performance PRH-P8MYA Fan speed <rpm> 1500 1.5kW 1400 1.1kW 1300 1200 1100 1000 internal static pressure (CMM) 1000 1170 1330 (L/S) Air flow : factory pre setting ESP = 100 Pa PRH-P10MYA Fan speed <rpm> 1700 2.2kW 1600...
  • Page 28 PRH-P16MYA 1000 Fan speed <rpm> 1300 1200 3.7kW 1100 1000 2.2kW internal static pressure (CMM) (L/S) 1830 2340 2830 Air flow : factory pre setting ESP = 200 Pa PRH-P20MYA 1000 Fan speed <rpm> 1300 5.5kW 1200 1100 3.7kW 1000 internal static pressure (CMM) (L/S)
  • Page 29 Air flow PRH-P8MYA Total SP (Pa) 1000 1170 1330 1420 Fan speed factory pre setting Pulley size 101.6 101.6 114.3 114.3 114.3 (Motor side) inch Pulley size 177.8 177.8 177.8 177.8 177.8 (Fan side) inch Belt size inch B57(red) B57(red)
  • Page 30 Air flow PRH-P16MYA Total SP (Pa) 1870 2000 2330 2670 2800 Fan speed factory pre setting Pulley size (Motor side) inch Pulley size (Fan side) inch Belt size inch B46(red) B46(red) B46(red) B46(red) B46(red) Motor (poles) Fan speed Pulley size 152.4 152.4 152.4...
  • Page 31 Air flow PRH-P20MYA Total SP (Pa) 2400 2670 3000 3330 3600 Fan speed factory pre setting Pulley size 88.9 88.9 88.9 88.9 88.9 (Motor side) inch Pulley size 152.4 152.4 152.4 152.4 152.4 (Fan side) inch Belt size inch B37(red) B37(red) B37(red) B37(red)
  • Page 32 Pulley outside dimensions are shown below: (Unit : mm) (1) Shape of belt groove V-belt Shape of Nominal thickness (Reference) V-belt Dia. øP.C (˚) Over 125 34 15.86 Under 160 Over 160 16.07 12.5 5.5 9.5 19.0 12.5 0.2~0.5 0.5~1.0 Under 200 Over 200 16.29...
  • Page 33: Center Of Gravity

    Inclining to the front side of unit. Compressor position 49cm 33cm 101cm Suspending spot 2-point,front and rear. Fasten here properly to prevent unit from slipping off from the sling at lifting. Item Net weight (kg) Model name PRH-P8MYA PRH-P10MYA - 30 -...
  • Page 34 Hanger rope ( Over 14m x 2) Warning Must be durable against unit weight. For the lifting of unit for movement, Lift unit slowly by suspending rope uniformly so Please be sure to suspend at four points, that the rope will not slip off or unit will not incline and not to give any shock to unit.
  • Page 35: Nc Curve

    [10] NC Curve PRH-P8MYA Measurement condition 63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz A characteristics (dB) NC70 Measured point NC60 NC50 NC40 NC30 Approximate minimum NC20 audible limit on continuous noise 1000 2000 4000 8000 OCTAVE BAND CENTER FREQUENCIES <Hz>...
  • Page 36 PRH-P16MYA Measurement condition 63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz A characteristics (dB) NC70 NC60 NC50 Measured point NC40 NC30 Approximate minimum NC20 audible limit on continuous noise 1000 2000 4000 8000 OCTAVE BAND CENTER FREQUENCIES <Hz> PRH-P20MYA Measurement condition 63Hz 125Hz 250Hz...
  • Page 37: Aservice Data

    SERVICE DATA [1] Appearance of Equipment • PRH-P8MYA/P10MYA/P16MYA/P20MYA unit Propeller fan Fan guard Outdoor-side fan motor Outdoor-side heat exchanger • PRH-P8MYA/P10MYA/P16MYA/P20MYA (with cover removed) Check joint (high pressure) Check joint (low pressure) Electrical parts box - 34 -...
  • Page 38 • PRH-P8MYA/P10MYA/P16MYA/P20MYA (with cover removed) Indoor-side controller board Indoor-side power board Outdoor-side controller board • PRH-P8MYA/P10MYA (with Main Board Panel removed) Outdoor-side Transformer Magnetic contactor for Indoor-side F.C. board fan motor <52F> Magnetic contactor for compressor <52C> Overcurrent relay <51C>...
  • Page 39 • PRH-P16MYA/P20MYA (with Main Board Panel removed) No.1 side Auxiliary relay Outdoor-side Auxiliary relay Transformer <X2> F.C. board <X11> <TR1> Auxiliary relay <X1> Magnetic contactor for compressor <52C1> Overcurrent relay <51C1> Magnetic contactor for fan motor <52F> Overcurrent relay <51F> Terminal block <TB11>...
  • Page 40 • PRH-P8MYA/P10MYA/P16MYA/P20MYA (Detail of outdoor-side 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.) Pressure switch (63H2) Pressure Accumulator switch (63H1) Thermistor <Discharge temp.>...
  • Page 41: Refrigerant Circuit

    < Cooling operation < Heating operation [3] Refrigerant Charge Model Amount of infusion of coolant at ex-factory PRH-P8MYA R407C 7.7 kg PRH-P10MYA R407C 8.2 kg PRH-P16MYA R407C 7.7 kg x 2 PRH-P20MYA R407C 8.2 kg x 2 [4] Operation Range...
  • Page 42: Safety & Control Devices

    [5] Safety & Control Devices ITEM PRH-P8MYA PRH-P10MYA PRH-P16MYA PRH-P20MYA Compressor over current relay High pressure switch 63H1 3.3MPa OFF Indoor-side fan motor over 2.8A 3.6A 5.0A 7.5A current relay Outdoor-side fan motor internal 135 ˚C OFF thermostat Fuse (Outdoor-side controller board) (N.F.
  • Page 43: Bcontrol

    CONTROL [1] Composition of Control ✻1: For each refrigerant circuit 1. Function block diagram Magnetic Over current Compressor contractor relay 380/400/415 V 50 Hz Fuse Transformer Fuse Fuse 4-way valve, LEV, DC5V for Semiconductor solenoid valve, microcomputer relay crankcase heater Communication Unit circuit...
  • Page 44: Control Specifications

    [2] Control specifications (1) Protection functions 1) The main protection devices for the unit are: a) High pressure protection (63H1) b) Compressor overcurrent protection (51C) c) Liquid temp thermistor trouble (TH1) d) Discharge temperature protection (TH2 ≥118 °C) e) Discharge temp thermistor trouble (TH2) Condenser/evaporater temp thermistor trouble (TH3) g) Low pressure protection (63L)
  • Page 45 (2) Compressor, 4-way valve, and crankcase heater control 1) Determines the operation mode and operates the compressor based on the indoor/outdoor communication or M- NET communication data. 2) Compressor control has a function which prevents the compressor from restarting within 3 minutes. 3) The 4-way valve is always ON during heating (except during defrosting).
  • Page 46 2) Control at heating a) When the compressor is stopped and during defrosting, the fan is stopped. b) 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 47 (5) Bypass solenoid valve control (SV1) 1) Control at cooling a) While the compressor is stopped, the solenoid valve is OFF. b) 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) is 25˚C or higher then the solenoid valve turns ON for 2 minutes.
  • Page 48: Function Of Switches And Connectors (outdoor-side)

    DIP SW Cooling only switching Cooling only Heat pump When power turned on PRH-P10MYA PRH-P8MYA Model setting PRH-P20MYA PRH-P16MYA 2) Switch functions at set mode change Set input mode CN33 = short SW3 = ON* Kind of Operation by switch operation...
  • Page 49 Serial communication abnormal (M-NET) E0-E7 Communication other than outdoor-side unit abnormal Input circuit faulty • PRH-P8MYA/P10MYA/P16MYA/P20MYA 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 50 Self diagnosis by SW2 • PRH-P8MYA/P10MYA/P16MYA/P20MYA SW2 setting Display contents Description of display Unit Outdoor-side unit –39 - 88 (When 0 °C or lower, “–”and temperature are displayed liquid temperature (TH1) 1 2 3 4 5 6 alternately.) °C –39 - 88 <Example>...
  • Page 51 Description of display SW2 setting Display contents Unit Newest check code When no check mode,“00” Newest outdoor unit <Example> When piping thermistor abnormal U4 1 2 3 4 5 6 abnormality Code display Check display Operation mode when Operation mode when abnormally stopped abnormality occurred <Example>...
  • Page 52 Display contents Description of display Unit Outdoor-side unit set Outdoor-side unit capacity is displayed as function code. information 1 Model name function code PRH-P8MYA 1 2 3 4 5 6 Code display PRH-P10MYA PRH-P16MYA 20 + 20 PRH-P20MYA 25 + 25...
  • Page 53 SW2 setting Display contents Description of display Unit Control mode display system Indoor-side Control mode Display control status Indoor-side Ordinary 1 2 3 4 5 6 Hot adjustment Defrosting Indoor-side – — Heater ON Freeze prevention Surge prevention Compressor OFF Outdoor-side unit –39 - 88 (When 0 °C or lower, “–”and temperature are displayed...
  • Page 54 Description of display SW2 setting Display contents 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 55: Function Of Switch On Indoor-side Controller Board

    [4] Function of switch on indoor-side controller board (1) DIP SW1 for model Selection (DIP SW1 has been set at factory) PRH-P8MYA/P10MYA/P16MYA/P20MYA: SW1-1, -3, -4 ON, SW1-2, -5 OFF (2) DIP SW2 for Capacity Setting (DIP SW2 has been set at factory)
  • Page 56: Simple Parts Check Method

    White Blue Indoor-side fan motor Measure the resistance value across the terminals with a multimeter. (Winding temperature 20 ˚C) Normal Motor lead wire PRH-P8MYA PRH-P10MYA PRH-P16MYA PRH-P20MYA 13.2 Ω 10.2 Ω 6.4 Ω 3.4 Ω Between 2 phases Abnormal Motor lead wire...
  • Page 57: Reference Data

    [6] Reference Data <Thermistor characteristic table> Low temperature thermistor Thermistor <Liquid temperature detection> (TH1, 5) Thermistor <Condenser/evaporater temperature detection> (TH3, 6) Thermistor <Indoor-side intake temperature (TH4) <Low temperature thermistor> Thermistor Ro = 15 kΩ ± 3 % B constant = 3,460 kΩ ± 2 % Rt = 15 exp {3,460 (––––––...
  • Page 58: Troubleshooting Of Each Part

    [7] Troubleshooting of each part (1) LEV 1) Overview of LEV operation LEV (electronic expansion valve) receives pulse signals from the outdoor-side controller board and drives a valve by means of a servomotor. The valve opening angle changes in proportion to the number of pulses. <Outdoor-side controller board and LEV>...
  • Page 59 2) Judgment method and probable trouble mode Trouble mode Judgment method Remedy (1) Disconnect the outdoor-side controller board connector, and connect the check LED shown below. Microcomputer drive cir- When drive circuit is faulty, re- cuit faulty place outdoor-side controller board.
  • Page 60 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 61: Emergency Operation

    [8] Emergency operation 1) When the following check displays occur at the outdoor-side controller board, or when the wired remote controller or indoor-side controller board microcomputer fails, if there are no other defects, emergency operation is possible shorting the connector (CN31) on the outdoor-side controller board.
  • Page 62 4) Emergency operation method Start * Before starting, recheck that the trouble allows emergency operation. ✻1: For each refrigerant circuit Piping work complete? Check that mains power is OFF Turn on emergency operation switch (SWE) on indoor-side controller board Short CN31 (emergency operation...
  • Page 63: Self-diagnosis And Troubleshooting

    [9] 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 unit terminal (1)a. Check power supply circuit breaker block TB1. b. Check power supply terminal block a.
  • Page 64 <Abnormality detected during unit operation: Outdoor-side unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Discharge temperature abnormal (1) Compressor overheating due to insuf- (1) Check input super heat. When the discharge thermistor tem- ficient refrigerant.
  • Page 65 Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting (8) Fan motor lock on the outdoor-side (8)~(12):During cooling operation (9) Fan motor malfunction on the outdoor Check the unit on the outdoor-side, -side and correct the problems. (10) Short cycle on the outdoor-side (11) Dirty heat exchanger on the outdoor (13)(14):Check the connectors...
  • Page 66 Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Remote controller communica- (1) Remote controller send/receive Perform remote controller diagnosis. tions receive abnormal (remote circuit faulty. Take the following action based on the di- controller).
  • Page 67 <Abnormality detected during unit operation: Indoor-side unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Intake sensor abnormal (1) Thermistor characteristics faulty. (1)-(3) 1) If thermistor open or short is de- (2) Connector contact faulty. Check thermistor resistance value 0 °C ..
  • Page 68 <Abnormality detected during unit operation: Indoor-side unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Drain overflow protection opera- (1) Drain pump trouble. (1) Check drain up mechanism. tion (2) Drain faulty. (2) Check drain characteristic. 1) When the drain sensor thermistor Drain pump clogged.
  • Page 69 <Abnormality detected during unit operation: Indoor-side unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Piping temperature abnormal (1) Indoor-side intake piping thermistor (1) Operate in test run mode and check <Cool> temperature differential small. piping temperature.
  • Page 70 <Abnormality detected during unit operation: Indoor-side unit> Abnormal- Meaning of abnormality display and Cause Judgment method and remedy ity display abnormality troubleshooting Remote control communication re- (1) Remote controller transmission line (1) Check if the unit or remote controller ceive abnormal contact faulty.
  • Page 71 <Troubleshooting and repair by symptom> Symptom and operation when normal Cause Symptom judgment and remedy 1. No remote controller display (1) DC14V is not supplied to remote con- (1) Check LED2 on indoor-side controller board. troller. 1) Steady light (No power O display on liquid crystal Check remote controller wire open or faulty panel.) contact.
  • Page 72 Symptom and operation when normal Cause Symptom judgment and remedy 7. Remote controller display is normal (1) Insufficient refrigerant. (1) - Since the discharge temperature rises when and heating operation is performed (2) Refrigerant piping heat insulation insuf- there is leakage, judge by measuring the tem- ficient.
  • Page 73: C Test Run

    Test run Before test run The test run can be carried out either from the unit or remote controller. 1. Check list • After wiring of units are complete, check that refrigerant is not leaking, the power and control wires are not loose, and the poles are not reversed.
  • Page 74 (6) Press the “ON/OFF” button to reset the test run in progress • The test run will be automatically shut down after two hours in response to the AUTO STOP setting of two hours on the timer. • During the test run, the room temperature display shows the unit indoor-side liquid piping temperatures. •...
  • Page 75 est run start and finish • Operation from the outdoor-side controller board Execute settings for test run start,finish and operation mode (cooling, heating) using the DIP switch SW 4 on the outdoor-side controller board substrate. <SW4> a) Set the operation mode (cooling, heating) using SW 4-2 b) Turn ON SW 4-1, The operation mode for SW 4-2 will be adhered to, and the test run will commence c) Turn OFF SW 4-1 to finish the test run •...
  • Page 76: Self-diagnosis

    • Depending on the position of the SW2 switch on the outdoor-side controller 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 77 3. (1) 3. Self-diagnosis result display See the above chart for details of error code contents. 1Hr. (1) When there is an error history ßC CHECK CLOCK FILTER ßC CHECK MODE STAND BY INDOOR UNIT ERROR CODE FUNCTION DEFROST ADDRESS NO a) Alternating display b) Error code c) Attribute of error search...
  • Page 78: Remote Controller Diagnosis

    Remote controller diagnosis If operation cannot be carried out from the remote controller,use this function to diagnose the remote controller. 1. First, check the electricity current marker If the correct voltage (DC 12 V) is not displayed on the remote 1Hr.
  • Page 79: Dinstallation

    All series of air conditioners are designed for outdoor installations and are to be placed on a slab or rooftop, however if the air conditioner is to be installed in a plant room application, please contact your equipment supplier prior to installation. Space required around units • Models PRH-P8MYA/P10MYA <A> <B> <A>...
  • Page 80 • Models PRH-P16MYA/P20MYA <A> <B> <A> <B> <C> 1. Basic space required A space of at least 250 mm is necessary at the right side for inlet air. Taking servicing, etc. from the right side into account, a space of about 450 mm should be provided, the same as at the front and back.
  • Page 81: Installation Of The Unit

    Installation of the unit • Models PRH-P8MYA/P10MYA A M10 anchor bolt procured at the site. B Corner is not seated. ø25.4 ø38.1 2000 Bottom wiring through hole (bolt hole) • Models PRH-P16MYA/P20MYA A M10 anchor bolt procured at the site.
  • Page 82: Duct Construction

    Duct construction • Models PRH-P8MYA/P10MYA <B> <A> <A> Ex. Side flow • Models PRH-P16MYA/P20MYA <B> Ex. Top flow A Duct <B> <A> B Roof curb C Single duct divider D Plenum divider E Insulator eep duct-w ork length 850 mm or more...
  • Page 83: Lifting Method

    Lifting method • Models PRH-P8MYA/P10MYA ˚ • Models PRH-P16MYA/P20MYA 14 m 14 m Caution: • Be very careful to carry product. - Do not have only one person to carry product if it is more than 20 kg. - PP bands are used to pack some products. Do not use them as a mean for transportation because they are dangerous.
  • Page 84: Drain Piping

    Drain piping • Models PRH-P8MYA/P10MYA • Models PRH-P16MYA/P20MYA 1399 1549 A Drain piping B Socket R1 C Drain trap D The drain pipe should e xtend below the level. 2 × External static pressure > = 2 × E > = 1.
  • Page 85: Modification Method Of Fan Direction (from Side Flow To Top Flow)

    Modification method of fan direction (From side flow to top flow) • Models PRH-P8MYA/P10MYA STEP 1 STEP 2 STEP 3 • Models PRH-P16MYA/P20MYA STEP 1 STEP 2 STEP 3 A Top panel B Cover (outer side) C Flange D Panel...
  • Page 86: The Putting Condition Of The Belt

    The putting condition of the belt 1. Set the parallel angle of the fan and the motor pulley as shown in the table and figure 1 below. 2. Set the tension of the per one belt when the flexion load is within the range as shown in the figure 1 and table 2 below at the proper flexion.
  • Page 87 The Air Conditioning & Refrigeration Systems Works acquired ISO 9001 certification under 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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