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Figure Index
Fig. No. AC/Heater Combo System Components Page
1 AC/Heater Combo System Components .............................................. Intro-1
2 Typical Off-Road Installation .............................................................. Intro-2
1-1 Cab Temperature Range ............................................................................. 1-1
1-2 Heat Energy Movement - Summer/Winter ................................................ 1-2
1-3 Cab Temperature Parked - Summer/Winter .............................................. 1-3
1-4 Coolant & Refrigerant Flow Inside the Systems ....................................... 1-3
1-5 Heat Energy Radiation ............................................................................... 1-4
1-6 Thermometer - Dial Type with Probe ......................................................... 1-4
1-7 Fahrenheit/Celsius Conversion Chart ....................................................... 1-5
1-8 Change of State - Illustrated with Water ................................................... 1-5
1-9 Change of State - Effect on Refrigerant ..................................................... 1-6
1-10 Change of State - Inside AC System........................................................... 1-7
2-1 AC/Heater Mounting Locations .................................................................. 2-2
2-2 AC System Operation - Diagram ................................................................ 2-3
2-3 Compressor Operation ................................................................................ 2-4
2-4 Clutch Assembly (to Compressor) ............................................................... 2-4
2-5 Condenser Function .................................................................................... 2-5
2-6 Receiver Drier Cutaway View ..................................................................... 2-5
2-7 Expansion Valve - Block Type Cutaway View ............................................ 2-6
2-8 Evaporator Coil with Thermostat .............................................................. 2-7
2-9 Heater System Components ....................................................................... 2-8
3-1 Pressure Radiator Cap - Thermostat Positions ......................................... 3-2
3-2 Pressure Radiator Cap - Sealing Cooling System ..................................... 3-2
3-3 Cooling System Water Pump Cutaway View ............................................. 3-3
3-4 Heater Core .................................................................................................. 3-3
3-5 Heater System Ducts - Typical ................................................................... 3-4
3-6 Blowers and Motors - Various Types .......................................................... 3-5
3-7 Heater Control Panel - Typical ................................................................... 3-5
3-8 Heater System Water Valves - Air & Cable Control .................................. 3-6
4-1 AC System Pressures & Change of State ................................................... 4-2
4-2 AC System Pressure & Temperature Relationship ................................... 4-3
4-3 Compressor Function - Low & High Side ................................................... 4-4
4-4 Compressor Designs Illustrated ................................................................. 4-5
4-5 Compressor Output (Performance) ............................................................ 4-8
4-6 Clutch Function - Thermostat Control ....................................................... 4-9
4-7 Condenser Designs - Illustrated ............................................................... 4-10
4-8 Receiver-Dryer Function ........................................................................... 4-11
4-9 Accumulator Function ............................................................................... 4-13
4-10 Internally Equalized Valve Function ....................................................... 4-14
4-11 Expansion Tube Design ............................................................................. 4-14
4-12 Evaporator Coil Function .......................................................................... 4-15
4-13 Roof Top AC System Blower & Fan Assembly ......................................... 4-16
4-14 HVAC Blend Air Duct System Cutaway View ......................................... 4-17
4-15 HVAC Stacked Core Arrangement Cutaway View .................................. 4-17
5-1 HVAC System In-Cab Control Function .................................................... 5-2
5-2 Thermostat Controls Illustrated ................................................................ 5-3
5-3 Pressure Switch/Clutch Control -Accumulator System ............................ 5-4
5-4 Refrigerant Flow Controls Illustrated ....................................................... 5-5
5-5
Heater System In-Cab Controls ................................................................. 5-7
5-6
Coolant Flow Using “H” Type Water Valve ................................................ 5-8
5-7
Air Operated Controls Cutaway View ........................................................ 5-9
5-8
Thermal Limiter/Superheat Switch Function ......................................... 5-10
5-9
Control Switch Variations Illustrated ...................................................... 5-10
5-10
Electrical Relay & Resistors Illustrated .................................................. 5-11
5-11
Electrical Schematic for Roof Mount AC System .................................... 5-11
5-12
Combination Controls - Binary™ & Trinary™ Switch Function............ 5-12
ii-1
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