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Refrigeration Maintenance and Service Operations
121
Heat Saves Time
A useful and practical time saver is the application of heat to the system. Increasing the temperature of the
compressor oil and refrigerant will speed up the vaporization of any water present in the system.
Heat lamps, electric heaters, or fans can be applied to the compressor crankcase and other parts of the
system to increase the temperature of the refrigerant and compressor oil.
R-134a Refrigeration System Charging
Charging R-134a System with Liquid Refrigerant by Weight (from an
Evacuated Condition)
NOTE: When both the R-134a and R-23 systems require charging, charge the R-23 system first.
1. Close valve V4.
2. Open the Gas Ballast valve (located on top of the pump housing behind the handle).
3. Stop the vacuum pump.
4. The discharge valve remains mid-seated.
5. Connect the refrigerant tank with gauge manifold to the evacuation station (see “Evacuation Station
and Unit Hookup” in this chapter).
1.
Close the vacuum valve and watch the movement of vacuum gauge needle. If
needle shows a pressure rise but finally levels off to a constant pressure, the
system still contains too much moisture. Dehydration and additional evacuation
time are required.
2.
Time
3.
Pressure (Vacuum)
4.
Atmospheric Pressure
Figure 40: Pressure Rise Levels Off After Evacuation Indicates Moisture in System
WARNING: Never use a torch or other concentrated heat source to heat the compressor or
other refrigeration system component.
Summary of Contents for Thermo King CRR DF MPC2000
Page 5: ...4 ...
Page 11: ...List of Figures 10 ...
Page 13: ...Introduction 12 ...
Page 19: ...Safety Precautions 18 ...
Page 21: ...Service Guide 20 ...
Page 47: ...Unit Description 46 ...
Page 97: ...Microprocessor Controller 96 ...
Page 101: ...Electrical Maintenance 100 ...
Page 141: ...Structural Accessory Maintenance 140 ...
Page 147: ...Refrigeration System Diagnosis 146 ...
Page 150: ...149 CRR DF MPC2000 Controller Diagram ...
Page 151: ...150 CRR DF MPC2000 Main Relay Board Electrical Diagram ...
Page 152: ...151 CRR DF MPC2000 Unit Wiring Schematic Low Speed Winding ...
Page 153: ...152 CRR DF MP3000A Controller Diagram ...
Page 154: ...153 CRR DF MP3000A Main Relay Board Electrical Diagram ...
Page 155: ...154 CRR DF MP3000A Unit Wiring Schematic Low Speed Winding ...
Page 157: ...156 CRR DF Refrigeration System Components Page 2 of 2 ...
Page 161: ...160 CRR DF Full Cool Flow and Pressure Diagram Page 2 of 2 ...
Page 163: ...162 CRR DR Evacuation Station and Unit Connections Page 2 of 2 ...