Mitsubishi Electronics PCH42GK, PCH24GK, PCH36GK, PCH30GK Microprocessor Control, OC277-27

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9

MICROPROCESSOR CONTROL

1.OUTLINE OF MICROPROCESSOR CONTROL

INPUT to remote controller

Remote controller board

OUTPUT to remote controller

 

OFF-ON switching.

COOL/DRY-AUTO-HEAT selector switching.

Thermostat setting.

TIMER mode selector-switching and Timer setting.

HIGH-LOW fan speed switching.

AUTO Vane selector (AIR DISCHARGE) switching.

Swing louver switching.(AIR SWEEP)

TEST RUN switching.

CHECK mode switching.

(Self diagnostic trouble shooting)

Processes and transmits orders.

Remote controller

LCD indicator

TIMER OFF TIMER

CLOCK AUTO AUTO

FAN

 

CHECK SET TEMP.

START STOP

SPEED

FILTER

 

 

AUTO

CHECK MODE

 

 

RETURN

TEST RUN

Indoor

 

unit

12VDC

 

Non-polar, two-wire cable maximum length 550 yards

Signal

INPUT from indoor unit

Room temperature thermistor (RT1)

Pipe temperature thermistor (RT2)

OUTPUT to indoor unit

Indoor controller board

Receives orders from remote controller and tem- perature data from indoor unit.

Processes orders and data.

Controls indoor and outdoor operation.

Self diagnostic function.

wSystem control operation.

wEmergency operation.

wSet by dip switch on indoor controller board. Transmits the power to remote controller.

1 2 3

Auto vane’s angle setting.

Swing louver control ON-OFF.

Booster heater ON-OFF Control.

Emergency stop.

Independent Control of

Outdoor Unit

Compressor protection device working

Defrosting

START-STOP

Fan speed control.

Crankcase heater control ON-OFF.

Self diagnostic function

Polar three-wire cable

Outdoor unit

12VDC

1

2

3

OUTPUT to outdoor unit

Compressor and outdoor fan : ON-

OFF

Operation mode change :COOL- HEAT.

OC277-27

Image 27
Contents OC277-1 ContentsOC277-2 FeaturesEasy Maintenance no Maintenance Necessary for 2500 Hours OC277-3Improving Efficiency of Piping Work OC277-4 Part Names and FunctionsOC277-5 Remote controller operation buttonsOC277-6 Remote controller displaySpecifications OC277-7Models PCH24GK, PCH30GK, PCH36GK, PCH42GK CFM SHC TPC DataOC277-8 Models PCH24GK, PCH30GK, PCH36GK, PCH42GK Performance DataCFM OC277-9Performance Curve OC277-10PCH36GK Cooling Capacity PCH36GK Heating Capacity OC277-11Condensing Pressure and Suction Pressure OC277-12PCH30GK OC277-13PCH36GK OC277-14PCH42GK OC277-15OC277-16 Standard Operation DataSHF PCH24GK PCH30GK PCH36GK PCH42GK Additional Refrigerant Charge R22oz OC277-17Operating Range Outlet AIR Speed and Coverage RangePCH36GK PCH42GK OC277-18Noise Criterion Curves PCH24GK PCH30GKOutlines and Dimensions OC277-19Indoor unit PCH24GK Indoor unit PCH30/36/42GK OC277-20PCH30GK PCH36GK PCH42GK Refrigerant System DiagramRemote controller OC277-21Wiring Diagram Model PCH24/30/36/42GK Wiring DiagramOC277-22 Operation FLOW-CHART OC277-23Main Operation Cooling Operation OC277-24YES OC277-25DRY Operation DRYHeating Operation OC277-26Microprocessor Control OC277-27Outline of Microprocessor Control Compressor control How to operateOC277-28 Indoor Unit ControlTermination conditions OC277-29Start condition Coil frost protectionAuto Return OC277-30Auto vane control SwingOC277-31 Detecting abnormalities in the outdoor unitRange a Range B Range C DRY operation time chart How to operate OC277-32DRY operation OC277-33 Display in Heat operation Heat operation time chartOC277-34 Heat operationOverheat prevention OC277-35Overheat protection Booster heater controlIndoor coil temperature abnormality detection OC277-36Defrosting operation OC277-37 Initial mode How to operateMode change Temperature rangeOC277-38 COOL/DRY operationAuto return Test run Before test run Timer operationTimer function OC277-39OC277-40 Emergency operationBefore emergency operation On indoor controller board Dip switch functionsOn remote controller board OC277-41PCH36, 42GK Fan motor max. rotational frequency Service RefOC277-42 PCH24GK PCH30GK PCH36GK PCH42GK SW7 OFFTrouble Shooting Remote Controller Display AbnormalityOC277-43 Example Check Unit code address When malfunction occurs during operationFor group control using one remote controller OC277-44OC277-45 Heat Wrong Wiring on SiteOC277-46 CoolOther Troubles and Causes OC277-47How to check the parts OC277-48PCH OC277-49 PAC-SA89TA-E System ControlOC277-50 Variety of System Control FunctionsOC277-51 Group Control with a Single Remote ControllerHow to wire How to set unit-addressRemote controller LCD indication Control Using TWO Remote ControllersRemote ON-OFF and Individual Remote Controls How to set SW17-7 See FigureOC277-53 Individual Control by Grouping the Remote ControllersBasic wiring Switch function of remote ON-OFF switchAuto Restart Function Multiple Remote Control DisplayTimer Operation or the Operation by AN External Signal OC277-54Removing the air intake grille Disassembly ProcedurePCH24GK Operating Procedure OC277-55Removing the side panel OC277-56Removing the fan motor Removing the sirocco fanRemoving the Indoor coil thermistor Operating Procedure PhotosOC277-57 Removing the vane motorRemove the intake grille OC277-58Removing the drain pan Removing the guide vaneOC277-59 Removing the support heaterRemoving the heat exchanger Parts List OC277-60Structural Part PCH24GK OC277-61 Structural Part PCH30GK PCH36GK PCH42GK OC277-62OC277-63 FAN and Heater Parts PCH24GK OC277-64FAN and Heater Parts PCH30GK PCH36GK PCH42GK OC277-65Electrical Parts PCH24GK10 PCH30GK PCH36GK PCH42GK OC277-66Timer Optional PartsOC277-67 SET Back Display PAC-SC32PTA Weekly Timer Setting DisplayOC277-68 Names and functionsRefrigerant Pipes Timer AdapterMultiple Remote Controller Adapter OC277-69Specifications are subject to change without notice