Mitsubishi Electronics PEH-5MYA, PE-8MYC, PE-15MYC, PE-20MYC, PE-10MYC, PEH-10MYA Trouble shooting

Page 108

7.Trouble shooting

Before you ask for repair service, check the following points:

State of Machine

Cause

Troubleshooting

 

 

 

 

 

 

Power failure.

Press the [ON/OFF] button after power restoration.

 

 

 

 

It does not run.

The power supply is turned OFF.

Turn the power supply ON.

 

 

The fuse in the power supply is gone.

Replace fuse.

 

 

 

 

 

 

 

 

The earth leakage breaker is gone.

Put in the earth leakage breaker.

 

 

 

 

Air flows out but it does not cool or heat

Improper temperature adjustment.

After checking the set temperature.

enough.

 

 

 

 

The filter is filled with dust and dirt.

Clean up the filter.

 

 

 

 

 

 

There are some obstacles at the air inlet and

Remove.

 

 

outlet of the units.

 

 

 

 

 

 

 

 

 

Windows and doors are open.

Close.

 

 

 

 

 

 

Insufficient refrigerant charge.

Contact with your installing contractor.

 

 

 

 

Cool or warm air does not come out.

The restart-preventing circuit is in operation for

Wait for a while.

(To protect the compressor, a 3-minute restart-

 

 

3 minutes.

preventing circuit is built into the unit.

 

 

 

 

 

 

Therefore, there are occasions sometimes when

 

 

 

the compressor does not start running immediately.

 

 

 

There are cases when it does not run for as long

 

 

 

as 3 minutes.)

 

 

 

 

 

 

Indoor unit operation was started anew during

Wait for a while.

 

 

the heating and defrosting operation.

(Heating operation starts after ending defrosting

 

 

(5 10 HP only)

operation.)

 

 

 

 

Fan runs but compressor do not run.

The set temperature of thermostat is

For temperature control,

excessively high for cooling.

decrease the set temperature at cooling.

 

 

 

 

excessively low for heating. (PEH only)

increase the set temperature at heating. (PEH only)

 

 

 

 

 

 

The room temperature is

Can not be operated as it is out of temperature

 

 

excessively low for cooling.

control range.

 

 

excessively high for heating. (PEH only)

 

 

 

 

Fan runs but stops immediately.

Air outlet and inlet are blocked.

Remove blocking matter.

 

 

 

Fogged white steam is discharged from

When the indoor temperature and humidity are

It is not a breakdown.

the indoor unit.

high, such a phenomenon is occasionally had

Please use as it is.

 

 

at the beginning of system operation.

 

 

 

 

Water or steam is discharged from the

At cooling, water which places to cooling piping

It is not a breakdown.

outdoor unit.

and piping connection part drops.

Please use as it is.

 

 

When heating, water which places to the heat

 

 

 

exchanger drops. (PEH only)

 

 

 

 

On heating, the air flow stops although a set

Frost adheres to the outdoor coil when the

It is not a breakdown.

temperature is not reached. (PEH only)

temperature on the outside is low and humidity

Please use as it is.

 

 

is high. This frost is melted.

 

 

 

 

 

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Contents Data Book Contents Safety for USE For correct installationDo not wash the unit with water Complete Line UP Indoor unitOutdoor unit Features DescriptionsMechanical Specifications Typical Installation ExampleMODEL-DESIGNATION Breakdown 10 M Y CSpecifications PE-7~20MYC Cooling onlyPEH-5,7,8MYA Heat pump PEH-10,15,20MYA Heat pump Electrical Data PE-7~20MYC-EUPEH-5,7,8MYA-EU HeatingPEH-10,15,20MYA-EU Selection Procedure Model Selection With actual examplesEfficiency Calculation Calculation of net capacityCapacity Tables Cooling Capacity Standard Air FlowFactor for Various Air Flow Heating Capacity Standard Air Flow PE-7MYC-EU , PEH-7MYA-EU PEH-7MYA-EU PE-8MYC-EU , PEH-8MYA-EU combined with PUH-8MYC1-EU PEH-8MYA-EU Use for low ambient cooling partsPE-8MYC-EU , PEH-8MYA-EU combined with PUH-8MYE-EU PE-8MYC-EU , PEH-8MYA-EU combined with PUH-8ME-EU Combined with PUH-8MYE-EUPE-10MYC-EU , PEH-10MYA-EU combined with PUH-10MYC1-EU PEH-10MYA-EU PE-10MYC-EU , PEH-10MYA-EU combined with PUH-10MYE-EU Combined with PUH-10MYE-EU PE-15MYC-EU 976 PEH-15MYA-EU 989 011 PE-20MYC-EU Use for low ambient cooling parts PEH-20MYA-EU PEH-20MYC-EU AIR Volume CMM Operation Range CoolingFAN Performance PEH-5MYA-EUPE-7MYC-EU PEH-7MYA-EU PE-8MYC-EU PE-10MYC-EU PEH-8MYA-EU PEH-10MYA-EUPE-15MYC-EU PEH-15MYA-EU PE-20MYC-EU PEH-20MYA-EUPulley outside dimensions are shown below Unit mm Sound Data Position mesurementIndoor units Outdoor unitsOutline Dimensions PEH-5PEH-7,8 PEH-10 PEH-1528.6 DRAINRc HOLES26PEH-20 Flange HOLES28PUH-5 PUH-7,8,10 Upper blowHoles Holes 2-ø15 Ø19.053/4PUH-8,10 Side blow PU-15Ø15.885/8130 Refrigerant Pipe PUH-8ø25.41 PUH-10ø28.61-1/8 Cable Entry 44 Holes 2-ø15PU-20 PUH-15,20Ø28.61-1/8 Ø15.885/8 Holes 6-ø15 Control Cable Entry ø27Duct work is local supply Wiring Diagrams PE-7MYC-EU StandardPE-8,10MYC-EU Standard Internal thermostat indoor fanOver current relayfanI/D,O/D PE-15MYC-EU Standard PE-20MYC-EU Standard TB1PE-7MYC-EU Special Order Anti Short Cycle Timer PE-8,10MYC-EU Special Order Anti Short Cycle Timer Internal thermostatindoor fanPE-15MYC-EU Special Order Anti Short Cycle Timer PE-20MYC-EU Special Order Anti Short Cycle Timer Symbol Name MC1,2 Compressor motor23C Ambient temperature PE-7MYC-EU Special Order LOW Ambient Cooling52F1 Contactor fan I/D 49F Internal thermostatfan O/DPE-8,10MYC-EU Special Order LOW Ambient Cooling PE-15MYC-EU Special Order LOW Ambient Cooling Do not change factory set value of Over current relaysPE-20MYC-EU Special Order LOW Ambient Cooling Auxiliary relay fanI/D30FZ Auxiliary relay fanI/D PEH-5MYA-EU Standard MF2PEH-7MYA-EU Standard Thermostat defrostWay valve Option controller connectionPEH-8,10MYA-EU Standard C1~7CR1 Surge killer PEH-15,20MYA-EU Standard MF2 Cool Heat CR1 Surge killer Timer Anti short cycle PEH-8,10MYA-EUPEH-15,20MYA-EU Special Wiring Anti Short Cycle Timer PEH-7MYA-EU Special Order LOW Ambient Cooling PEH-8,10MYA-EU Special Order LOW Ambient Cooling MF2 Fan motor outdoor52F1 Contactor fan I/D 52F2 Contactor fan O/D 52F4 CR1 Surge killer 21S4 Way valve 26D1 Thermostat defrost 26L63H1,2 High-pressure switch 26L1,2 PEH-15,20MYA-EU Special Order LOW Ambient Cooling51F1~5 Electrical Operation Flow Charts PE-7,8,10MYC-EUPEH-5MYA-EU, PEH-7,8,10MYA-EU PE-15MYC-EU PE-20MYC-EU PEH-15,20MYA-EU Refrigerant Schematics PE-7,8,10,15,20MYC-EUPEH-5,7,8,10,15,20MYA-EU Safety & Control Devices PE-7,8,10MYC-EU PE-15,20MYC-EUPEH-7,8,10MYA-EU Service ref Special OrderYear Physical Data PE-7,8,1015,20MYC-EUIndoor AIR Circuit Enclosure and Frame PEH Series PEH-5MYA-EU PE-8MYA-EU JH527YE JH521YE 596X1415 PUH-10MYC1-EU PUH-10MYE-EU PUH-15MYC1-EU PUH-20MYC1-EU Installation Space required around unit Indoor unitOutdoor unit Service-panel Ceiling OverOver 500 PU-15 At a single installation Over Service PanelPreparation before installing Indoor unit Over Service-panelOver Service-panel 500 Installation of the unit Indoor unit Outdoor unitNut Washer Nut M10 WasherDuct construction Lifting methodPiping connection Case of Brazing typeValve knob Pipe assyThrow away Fig By-pass tube Flange assy Extension pipe Extension pipe Use the attached new packing FigGood example Bad example Airtight test EvacuationAdditional refrigerant charge Drain piping Electric wiring Arrangement such as terminal block in control boxControl module of outdoor unit PUH-5, 8 Terminal block for connection wires Power supply wiresControl module of outdoor unit PUH-7, 8 Control module of outdoor unit PU-20Method for connecting electric wire Protection switch 50A60A Selection of other capacities should bePutting condition of the belt Before starting the Trial run=4.5mm Flexion loadW 1.4 2.2kg Instructions for USE Check points for operationOutlet grille Ceiling Ceiling Obstacle blocking air outletMaintenance Fingermarks Neutral GreaseAdhesive Isopropyl Paste AlcoholWhen beginning to use air conditioner again When the air conditioner is not to be used for a long timeTransfer of installation Transferring work, and constructionPlace for installation Maintenance and inspectionRegarding electric work Conseration of the noiseTrouble shooting At cooling, water which places to cooling pipingHOW to Operate Option PAC-204RC Display sectionBefore starting operation On / OFF Start an operationSelecting operation When selecting operation Room temperature adjustment To change room temperatureFor fan For coolingTime setting Days timer keyTimer Hold/Resume key Clock keyTrouble shooting Error DisplaySpecification Guidelines Outdoor UnitMemo Mitsubishi Electric Corporation Data Book PE,PEH