Mitsubishi Electronics PCA-A24GA service manual

Page 21

10-4. WHEN WIRED REMOTE CONTROLLER OR INDOOR UNIT MICROCOMPUTER TROUBLES

1.If there is not any other problem when trouble occurs, emergency operation starts as the indoor controller board switch (SWE) is set to ON.

During the emergency operation the indoor unit operates with Indoor fan at high speed.

2.For emergency operation of cooling or heating

In emergency operation for COOL or HEAT, setting of the switch (SWE) in the indoor controller board and outdoor unit emergency operation are necessary.

3.Before you activate emergency operation, check the following points:

(1)Emergency operation cannot be activated when:

·the outdoor unit malfunctions.

·the indoor fan malfunctions.

(2)Emergency operation becomes continuous only by switching the power source on / off. ON / OFF on the remote control or temperature control etc. does not function.

(3)Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation of the heating is acti- vated, because it will start to blow cold air.

(4)Emergency cooling should be limited to 10 hours maximum. (The indoor unit heat exchanger may freeze.)

(5)After emergency operation has been deactivated, set the switches etc. to their original positions.

(6)Movement of the vanes does not work in emergency operation, therefore you have to slowly set them manually to the appropriate position.

21

Image 21

Contents Revised EDITION-B ContentsPCA-A24GA PCA-A30GATechnical Data Book Technical ChangesReference Manual Always Observe for Safety Safety PrecautionAdditional refrigerant charge When charging directly from cylinderIndoor Unit Part Names and FunctionsDisplay Section Mode Select button Operation Mode displayTemperature setting display Timer displayService Ref SpecificationsPCA-A30GA, PCA-A30GA1Single phase, 60Hz, 208/230V PCA-A36GA, PCA-A36GA1Single phase, 60Hz, 208/230VPCA-A24GA1 Noise Criterion CurvesPCA-A30GA1 PCA-A36GA1PCA-A24GA PCA-A24GA1 PCA-A30GA PCA-A30GA1 Outlines and DimensionsUnit inchmm PCA-A36GA PCA-A42GA PCA-A36GA1 PCA-A42GA1Indoor unit Installation Manual Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingSELF-DIAGNOSIS Action Table Pipe temperature Cause Countermeasure Freezing/overheating protection isWorking Remote controller transmission Cause Countermeasure Pipe temperature thermistorErrorE0/signal receiving errorE4 ErrorE3/signal receiving errorE5 Error Transmitting error Error Signal receiving error Remote controller control board Indoor controller boardPhenomena Cause Countermeasure Troubleshooting by Inferior PhenomenaIs off Ply systemIs blinking 4Receiver for wireless remote3Upward/downward vane Performance failurePage Vane motor MV Test Point Diagram Between 1 to 3 12.6-13.7V DC Pin1 +Connect to the indoor controller board CN2D PCA-A36GA PCA-A36GA1 Models Functions of DIP Switch and Jumper WireOperating Procedure Photos & Illustrations Disassembly ProcedureRemoving the air intake grille Removing the electrical boxRemoving the fan motor MF Operating ProcedureRemoving the sirocco fan Remove the air intake grilleRemoving the vane motor MV Operating Procedure PhotosRemoving the Indoor coil thermistor TH2/TH5 Removing the Under panelRemoving the guide vane Removing the drain panRemove the intake grille. See the figure Removing the Auto vaneRemoving the heat exchanger Drawing No Parts No Parts Name SpecificationsR01 29J 130 R01 35J 130Structural Part PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Electrical Parts PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA RoHS Parts Name SpecificationsRemarks Parts NoStructural Part PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1 Wiring Recom Electrical Parts PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1RoHS Qty/ set