Mitsubishi Electronics PKH30FL, PKH36FL, PKH24FL Compressor control, Fan control in DRY operation

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1)Compressor control

1 3-minute time delay

To prevent overload, the compressor will not start within 3 minutes after stop.

2The compressor runs when room temperature is higher than set temperature.

The compressor stops when room temperature is equal to or lower than the set temperature.

The compressor maintains the previous state when the room temperature minus the set temperature is 0°F or more, or lower than 2°F.

3The compressor stops in check mode or during protective functions.

4The compressor will not start when the room temperature is 64°F or below.

The compressor starts intermittent operation when the power is turned ON with room temperature above 64°F. The com- pressor ON/OFF time depends on the thermostat ON/OFF and the following room temperatures.After 3-minute compressor operation,

If the room temperature thermistor reads above 82°F with thermostat ON, the compressor will operate for 6 more minutes and then stop for 3 minutes.

If the room temperature thermistor reads 79°F to 82°F with thermostat ON, the compressor will operate for 4 more min- utes and then stop for 3 minutes.

If the room temperature thermistor reads 75°F to 79°F with thermostat ON, the compressor will operate for 2 more min- utes and then stop for 3 minutes.

If the room temperature thermistor reads below 75°F with thermostat ON, the compressor will stop for 3 minutes.

If the thermostat is OFF regardless of room temperature, the compressor will stop for 10 minutes.

5Coil frost protection

Coil frost protection in DRY operation is the same as in COOL operation.

6Coil frost prevention

Coil frost prevention does not operate in DRY operation.

(2)Indoor fan control

The indoor fan runs on LOW speed during compressor operation. The fan speed cannot be changed with the remote con- troller. Also, the fan runs on LOW speed when the pipe temperature is 43°F or more, or the compressor is OFF and the pipe temperature is below 43°F.

(a)During compressor OFF

When the indoor coil temperature is 43°F or above, the indoor fan will stop.

When the indoor coil temperature is below 43°F, the indoor fan will run on LOW speed.

(b)During compressor ON

The indoor fan runs on LOW speed. <Dry mode>

The fan notch is controlled by the indoor coil temperature every 30 seconds.

Fan control in DRY operation.

Pipe temp.

Fan

43°F or more

STOP

Compressor OFF

 

Below 43°F

LOW

Compressor ON

All

LOW

(3)Auto vane control

Same as in COOL operation

(4)Detecting abnormalities in the outdoor unit

An abnormality in the outdoor unit can not be detected in DRY operation.

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Contents Contents Revised EDITION-AFeatures Part Names and Functions Specifications Models PKH18FL, PKH24FL, PKH30FL, PKH36FLData Models PKH18FL, PKH24FL, PKH30FL, PKH36FL Performance DataHeating Capacity Performance Curve PKH18FLPKH24FL PKH36FL PKH18FL Cooling Mode Heating ModeCondensing Pressure and Suction Pressure PKH24FL Cooling Mode Indoor DB temperature F 80 psi.G Pressure SuctionPKH30FL Cooling Mode PKH36FL Cooling Mode Standard Operation Data SHF PKH18FL PKH24FL PKH30FL PKH36FLOperating Range Outlet AIR Speed and Coverage RangeWith wind baffle D.B F if no wind baffle PKH36FL Noise Criterion CurvesPKH30FL Band Center FREQUENCIES, HzOutlines PKH24FLUnit inch PKH36FL PKH30FL InchRefrigerant System Diagram Wireless Remote ControllerPKH18FL PKH24FL PKH30FL PKH36FL Wiring Diagram Models PKH18FL, PKH24FL, PKH30FL, PKH36FL Wiring DiagramOperation FLOW-CHART Main OperationCooling Operation DRY Operation YESHeating Operation YES FAN Speed noMicroprocessor Control Outline of Microprocessor ControlIndoor Unit Control Cool operation time chartHow to operate Cool operationCoil frost protection Compressor controlStart condition Termination conditionsAuto vane control Auto ReturnDetecting abnormalities in the outdoor unit DRY operation time chart How to operate DRY operationFan control in DRY operation Heat operation time chart How to operate Heat operationDisplay in Heat operation Overheat protection Booster heater controlOverheat prevention Indoor coil temperature abnormality detection Defrosting operationInitial mode Mode changeTemperature range Auto vane control COOL/DRY operationAuto return Timer operation Timer functionTest run Emergency operation Before emergency operationDip switch and jumper connector functions On remote controller board On indoor controller boardIndoor FAN Control Wireless remote controller pair number setting operation Model NoTroubleshooting Self-checkOther Troubles and Causes Wrong Wiring on Site Between remote controller and indoor unitHOW to Check the Parts Check pointsIndoor unit PKH24FL Disassembly ProcedureOperating Procedure PHOTOS&ILLUSTRATION PhotoRemoving the vane motor Removing the intake grillesRemoving the drain pan Operating Procedure Photos Removing the line flow fan and the fan motorRemoving the electrical heater Parts List Electrical Parts PKH18FL PKH24FL PKH30FL PKH36FLT7W E14 Qty / set Wiring Parts No Parts Name SpecificationsT7W E13 R01 12G 621Structural Parts PKH24FL PKH30FL PKH36FLPage Distributed in Dec No.OC276 New publication, effective Nov Specifications are subject to change without notice