SECTION 22: HEATING AND AIR CONDITIONING
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
3
ILLUSTRATIONS
FIGURE 1: PASSENGERS’ UNIT AIR CIRCULATION ................................................................................ 5
FIGURE 2: HEATING CIRCUIT .................................................................................................................... 5
FIGURE 3: REFRIGERANT CIRCUIT ......................................................................................................... 6
FIGURE 4: EVAPORATOR COMPARTMENT ARRANGEMENT ................................................................ 7
FIGURE 5: DRIVER’S AIR CIRCULATION .................................................................................................. 8
FIGURE 6: PASSENGERS' AREA FRESH AIR DAMPER .......................................................................... 8
FIGURE 7: PASSENGERS’ PARCEL RACK VENTILATION SYSTEM ....................................................... 8
FIGURE 8: HVAC SYSTEM CONTROL UNIT ............................................................................................ 10
FIGURE 9: TEMPERATURE SENSOR ...................................................................................................... 10
FIGURE 10: EVAPORATOR COMPARTMENT ......................................................................................... 10
FIGURE 11: HVAC MODULE ..................................................................................................................... 11
FIGURE 12: DRIVER'S HVAC UNIT COIL ACCESS PANEL .................................................................... 11
FIGURE 13: EVAPORATOR COIL ACCESS PANEL (TYPICAL) .............................................................. 12
FIGURE 14: EVAPORATOR COIL CLEANING.......................................................................................... 12
FIGURE 15: CONDENSER COMPARTMEN ............................................................................................. 12
FIGURE 16: DRIVER'S HVAC UNIT ACCESS GRILL ............................................................................... 12
FIGURE 17: REMOVING RECIRCULATING AIR FILTER ......................................................................... 13
FIGURE 18: PASSENGERS' SECTION AIR FILTER ................................................................................ 13
FIGURE 19: PARCEL RACK FAN AIR FILTER ......................................................................................... 13
FIGURE 20: COMPRESSOR SHUT-OFF VALVE BACKSEATED POSITION (NORMAL
OPERATING POSITION) ............................................................................................................................ 20
FIGURE 21: COMPRESSOR SHUT-OFF VALVE IN FRONT SEATED POSITION .................................. 21
FIGURE 22: RECOVERY UNIT CONNECTED TO RECEIVER SERVICE PORT .................................... 22
FIGURE 23: MOISTURE INDICATOR SIGHT GLASS .............................................................................. 23
FIGURE 24: COMPRESSOR BELT TENSIONER ..................................................................................... 26
FIGURE 25: STANDARD BELT ARRANGEMENT..................................................................................... 26
FIGURE 26: TORQUES ............................................................................................................................. 26
FIGURE 27: PRESSURE TRANSDUCERS ............................................................................................... 26
FIGURE 28: SHAFT SEAL OIL COLLECTING TUBE ................................................................................ 27
FIGURE 29: MOUNTING BOLTS TORQUE – 4 BOLTS ............................................................................ 27
FIGURE 30: UNLOADER COIL ASSEMBLY .............................................................................................. 28
FIGURE 31: EVAPORATOR COMPARTMENT ......................................................................................... 28
FIGURE 32: EVAPORATOR MOTOR ASSY FIXING BOLTS ................................................................... 29
FIGURE 33: EVAPORATOR MOTOR ASSEMBLY ................................................................................... 29
FIGURE 34: CONDENSER FAN SPEED IN RELATION WITH HIGH SIDE PRESSURE......................... 30
FIGURE 35: CONDENSER FAN MOTOR .................................................................................................. 30
FIGURE 36: RECEIVER TANK .................................................................................................................. 30
FIGURE 37: ISOLATED SECTION ............................................................................................................. 31
FIGURE 38: CONDITIONS THAT MAY BE OBSERVED IN THE MOISTURE INDICATOR SIGHT
GLASS ........................................................................................................................................................ 32
FIGURE 39: REFRIGERANT CIRCUIT SHUT-OFF VALVE ...................................................................... 32
FIGURE 40: REFRIGERANT CIRCUIT SHUT-OFF VALVE ...................................................................... 32
FIGURE 41: DRIVER'S UNIT LIQUID SOLENOID VALVE ........................................................................ 32
FIGURE 42: LIQUID REFRIGERANT SOLENOID VALVES INSIDE CONDENSER
COMPARTMENT ........................................................................................................................................ 33
FIGURE 43: TYPICAL REFRIGERANT SOLENOID VALVE ..................................................................... 34
FIGURE 44: REFRIGERANT SOLENOID VALVE .................................................................................... 34
FIGURE 45: EXPANSION VALVE .............................................................................................................. 35
FIGURE 46: SUPERHEAT ADJUSTMENT INSTALLATION ..................................................................... 36
FIGURE 47: HIGH & LOW SWING TEMPERATURE AT REMOTE BULB ................................................ 36
FIGURE 48: CEILING OF THE SPARE WHEEL COMPARTMENT .......................................................... 42
FIGURE 49: DRIVER'S HVAC/DEFROST UNIT ........................................................................................ 42
