SECTION 22: HEATING AND AIR CONDITIONING
PA1621 Maintenance Manual All Series | Section revised November 2017
1
CONTENTS
1. TORQUETABLES.........................................................................................................................................5
1.1 HIGHCAPACITYCOMPRESSOR(CENTRALHVACSYSTEM).............................................................................5
1.2 HIGH/LOWPRESSURESERVICEANDRECEIVERTANKVALVES......................................................................6
1.3 IDLERS&TENSIONERS...................................................................................................................................6
1.4 SMALLA/CSYSTEMX3‐45VIP.......................................................................................................................7
2. HVACSYSTEMOVERVIEW........................................................................................................................... 8
2.1 CENTRALHVACSYSTEMEVAPORATORCOMPARTMENTARRANGEMENT...................................................8
2.2 CENTRALHVACSYSTEM–HSERIES...............................................................................................................9
2.3 CENTRALHVACSYSTEM–XSERIES.............................................................................................................12
2.4 SMALLHVACSYSTEM–HSERIES.................................................................................................................14
2.5 SMALLHVACSYSTEM–XSERIES.................................................................................................................16
3. HVACSYSTEMBASICMAINTENANCE.........................................................................................................18
3.1 COILCLEANING............................................................................................................................................18
3.1.1 Driver’sUnit.........................................................................................................................................18
3.1.2 Passenger’sUnit..................................................................................................................................18
3.2 DRIVER’SUNITAIRFILTER............................................................................................................................19
3.3 PASSENGER’SUNITAIRFILTER–H3SERIES.................................................................................................19
3.4 PASSENGER’SUNITAIRFILTER–X3SERIES.................................................................................................20
3.5 OVERHEADCOMPARTMENTFANAIRFILTER..............................................................................................20
3.6 COMPRESSORBELTS....................................................................................................................................21
3.6.1 BeltReplacement–CentralSystem.....................................................................................................21
3.6.2 BeltTensionAdjustment–CentralSystem..........................................................................................21
3.6.3 BeltTensionAdjustment–SmallHVACSystemH‐SERIES....................................................................22
3.6.4 BeltTension‐SmallHVACSystemX‐SERIES........................................................................................22
3.7 TORCHBRAZING..........................................................................................................................................22
3.8 SOLDERING..................................................................................................................................................23
4. HVACSYSTEMCOMPONENTS....................................................................................................................23
4.1 COMPRESSOR–CENTRALA/CSYSTEM.......................................................................................................23
4.1.1 SuctionandDischargeHoseConnection..............................................................................................23
4.1.2 CompressorMaintenance....................................................................................................................23
4.1.3 OilLevelCheckandOilChange............................................................................................................23
4.1.4 TroubleshootingGuide.........................................................................................................................24
4.1.5 Electro‐MagneticClutch.......................................................................................................................25
4.2 COMPRESSOR–SMALLHVACSYSTEM........................................................................................................25
4.2.1 Removal‐WhentheCompressorIsOperational.................................................................................25
4.2.2 Removal‐WhentheCompressorIsInoperable...................................................................................25
4.3 BRUSHLESSEVAPORATORMOTOR..............................................................................................................25
4.3.1 Removal...............................................................................................................................................26
4.3.2 Installation...........................................................................................................................................26
4.4 CONDENSER(CENTRALA/C)........................................................................................................................27
4.4.1 CondenserFanControl.........................................................................................................................27
4.4.2 CondenserFanRemoval.......................................................................................................................28
4.5 CONDENSER(SMALLA/C)............................................................................................................................28
4.6 RECEIVERTANK............................................................................................................................................29
4.7 FILTER‐DRYER...............................................................................................................................................30
4.7.1 ReplacementoftheFilter‐DryerAfterPumpingDown........................................................................30
4.8 MOISTUREINDICATOR.................................................................................................................................30
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