Mitsubishi Electronics PRH-5, 8 Preparing for Operation After Prolonged Shutdown, Troubleshooting

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4. PREPARING FOR OPERATION AFTER PROLONGED SHUTDOWN

When the usage season starts, proceed with the following before starting operation: (1)Clean the air filter.

(2)Do not use the unit immediately. Turn the main power switch on for a period of 3 hours before restarting cooling / heating operation. This allows the compressors to come up to the correct operation temperatures. Failure to do this, could cause compressor failure.

5.PREPARING FOR PROLONGED SHUTDOWN

After the usage season is over, prepare the air conditioner for later use by: (1)Setting the power switch to OFF.

(2)Consulting your Air conditioning specialist for detailed information.

6.TROUBLESHOOTING

If any trouble occurs, turn the operation (start or run) switch off immediately.

Symptom

Possible cause

Remedy

 

Power failure.

Wait for power supply

 

recovery.

Both fan and compressor

 

 

 

Blown fuse of power

Contact your

do not run.

source switch.

Air conditioning specialist.

 

 

 

 

 

 

Excessively low power

Ask your electric power

 

source voltage.

company.

 

The set temperature of

For temperature control,

 

 

thermostat is

• decrease the set

 

• excessively high for

temperature at cooling.

 

cooling.

• increase the set

Fan runs but compressor

• excessively low for

temperature at heating.

heating.

 

 

 

does not run.

 

 

The room temperature is

Can not be operated as

 

 

• excessively low for

it is out of temperature

 

cooling.

control range.

 

• excessively high for

 

 

heating.

 

 

 

 

Fan runs but stops

Air outlet and inlet

Remove blocking matter.

are blocked.

 

immediately.

 

 

 

 

 

 

 

The filter installed in

Clean it.

 

the field is clogged

 

 

with dust.

 

Runs but without cooling/heating.

Windows and doors are

Close them.

being opened.

 

 

 

Air outlet and inlet

Remove blocking matter.

are blocked.

 

 

 

The set temperature of

For temperature control,

thermostat is

• decrease the set

• excessively high for

temperature at cooling.

cooling.

• increase the set

• excessively low for

temperature at heating.

heating.

 

 

 

Insufficient

Contact your

refrigerant charge.

Air conditioning specialist.

 

Note:

If the unit does not operate normally after troubleshooting, please contact your local equipment supplier or air conditioning contractor.

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Contents Heat Pump Data BookContents For correct installation Safety for USEDo not wash the unit with water Complete Line UP High Sensible Cooling Capacity FeaturesDescriptions Mechanical SpecificationsPRH PRH-L Typical Installation ExampleGross SpecificationsElectrical Data CoolingHeating Cooling Capacity Nominal Air FlowPR-5YC,PRH-5YA,PRH-5YA-L Capacity TablesFactor for Various Air Flow PR-5YC PRH-5YA-LRange PRH-5YA Heating Capacity Nominal Air FlowPRH-5YA,PRH-5YA-LPR-8YC PRH-8YA-L PRH-8YA Cooling Capacity Nominal Air FlowPR-8YC,PRH-8YA,PRH-8YA-LHeating Capacity Nominal Air FlowPRH-8YA,PRH-8YA-L PR-8YC PRH-8YA-LPRH-8YA PR-10YC PRH-10YA-L PRH-10YA Cooling Capacity Nominal Air FlowPR-10YC,PRH-10YA,PRH-10YA-LHeating Capacity PRH-10YA-LPRH-10YA PR-15YC PRH-15YA-L PRH-15YA Cooling Capacity Nominal Air FlowPR-15YC,PRH-15YA,PRH-15YA-LPRH-15YA PR-15YC PRH-15YA-LPR-20YC PRH-20YA-L PRH-20YA Cooling Capacity Nominal Air FlowPR-20YC,PRH-20YA,PRH-20YA-LPRH-20YA PRH-20YA-LPR-YC Operation rangePRH-YA PRH-YA-LRpm FAN PerformanceOperation range Fan speed Pressure Pulley outside dimensions are shown below Unit mm PR-5YC PRH-5YA PRH-5YA-L PR-8YC PRH-8YA PRH-8YA-L NC CurvesPR-15YC PR-10YCPR-20YC Outline DimensionsPR-15,20YC PRH-15, 20YA PRH-15, 20YA-L PR-8,10YC PRH-8, 10YA PRH-8, 10YA-LPR-5, 8, 10YC Standard Wiring DiagramsPR-15, 20YC Standard Special Order K Control PR-5, 8, 10YCInternal Protector Special Order LOW TemperaturePR-15, 20YC 50Hertz Special Order K Control & LOW TemperaturePRH-5, 8, 10YA-L Standard PRH-5, 8, 10YAPRH-15, 20YA-L Standard PRH-5, 8, 10YA PRH-5, 8, 10YA-L 10YA PRH-15, 20YA PRH-15, 20YA-L 21S4 Way valve MC Operate MF2 Operate OFF Safety Device OFF? YES Electrical Operation Flow ChartsOFF 52C OFF MC Stop MF2 Stop RL on CH on Service Call MF1 Operate YESMF1 Operate Start Power on Start Power on Refrigerant Schematics PR-5YCPR-8, 10, 15, 20YC PRH-8, 10, 15, 20YA PRH-8, 10,15,20YA-L Accessory Availability Safety & Control DevicesElectrical Physical DataRooftop Package AIR Cooled Heatpump and Cooling only Units Installation ClearancesRoof Mounting Drain piping Duct WorkElectrical Wiring Final ChecksTrial Operation Check Points for Operation Instructions for USEFingermarks MaintenanceTroubleshooting Preparing for Operation After Prolonged ShutdownPreparing for Prolonged Shutdown Specification Guidelines Memo Data Book PR,PRH Mitsubishi Electric Corporation

20-L, 8, PRH-5, 15, 10 specifications

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