WD Catalog 2018

Figure Index

Fig. No. AC/Heater Combo System Components

Page

6-1 6-2 6-3 6-4 6-5 6-6 6-7 6-8 6-9 7-1 7-2 7-3 7-4 7-5 7-6 7-7 7-8 7-9 8-1 8-2 8-3 8-4 8-5 8-6 8-7 8-8 8-9

Refrigerant Container Example ................................................................. 6-3 Manifold Gauge Set Function ..................................................................... 6-4 Manifold Gauge Set Hookup Location ....................................................... 6-5 Compressor Service Valves Cutaway View ................................................ 6-6 R-134a Service Ports/Hose End Fittings .................................................... 6-6 Vacuum Pumps Illustrated ......................................................................... 6-7 Leak Detector Components & Function - Halide Type ............................. 6-8 Leak Detector - Electronic .......................................................................... 6-9 Flushing Kit Components - AC System...................................................... 6-9 Dipsticks Measure Refrigeration Oil in Compressor .............................. 6-10 Refrigerant Charging Meters & Stations Illustrated .............................. 6-11 AC System Maintenance Frequency Chart ............................................... 7-1 AC System Visual Inspection ...................................................................... 7-3 AC System Inspection - Mounting Bolts .................................................... 7-3 AC System Inspection - Fitting Leaks ....................................................... 7-5 AC System Inspection - Electrical Wiring .................................................. 7-6 AC System Cab Temperature Range Chart ............................................... 7-8 AC System Inspection - Sight Glass ........................................................... 7-9 Heater System Visual Inspection ............................................................. 7-10 Preventative Maintenance Schedule ........................................................ 7-12 System Operation Sequence ....................................................................... 8-2 Manifold Gauge Set Installation ................................................................ 8-6 Manifold Gauge Set Purging Setup ............................................................ 8-7 Manifold Gauge Set Purging Center Hose ................................................. 8-8 Troubleshooting With Gauges - Low Refrigerant Reading ..................... 8-10 Troubleshooting With Gauges - Very Low Refrigerant Reading ............. 8-11 Troubleshooting With Gauges - Air and Moisture ................................... 8-12 Troubleshooting With Gauges - Extreme Air and Moisture .................... 8-13 Troubleshooting With Gauges - TXV Stuck Closed ................................. 8-13 Troubleshooting With Gauges - TXV Stuck Open ................................... 8-15 Troubleshooting With Gauges - High Side Restriction ........................... 8-16 Troubleshooting With Gauges - Compressor Problem............................. 8-17 Troubleshooting With Gauges - Condenser and Overcharge .................. 8-18 Troubleshooting With Gauges - Thermostat Problem ............................. 8-19 Recovery/Recycle Station Example ............................................................ 9-3 Recycled Refrigerant Pressure Chart ......................................................... 9-6 AC System Evacuation Procedure .............................................................. 9-7 Vacuum Pump .............................................................................................. 9-8 AC System Charging - Low Pressure Side (Gas Refrigerant) ................... 9-9 AC System Charging - High Pressure Side (Liquid Refrigerant) ........... 9-10 Clutch Wiring Schematic - Clutch Circuit ............................................... 10-3 Air Block Operation ................................................................................... 10-6 Constant Temperature Control System ................................................... 10-8 Auxiliary Universal Heater Illustrated ................................................... 11-1 Universal Heater/Defroster Illustrated ................................................... 11-2 Universal AC Unit Cab Roof Mount Illustrated ...................................... 11-2 HVAC Combination Unit Illustrated........................................................ 11-3 HVAC Under Dash Installation Illustrated ............................................. 11-3 Roof Mounted Condenser - Low Profile Illustrated ................................. 11-4 Auxiliary Universal HVAC Unit Illustrated ............................................ 11-4 Sleeper Box/Truck Cab Combo System .................................................... 11-5 Intercooler Installed Above Condenser .................................................... 11-5 R-134a Service Ports/Hose End Fittings .................................................. 12-3

6-10 6-11

8-10 8-11 8-12 8-13 8-14

9-1 9-2 9-3 9-4 9-5 9-6

10-1 10-2 10-3 11-1 11-2 11-3 11-4 11-5 11-6 11-7 11-8 11-9 12-1

ii-2

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