Refrigeration Maintenance
88
Set Up and Test of Evacuation
Equipment
NOTE: See the previous two pages for the
following discussion.
1. Connect the evacuation system to a 110 Vac
power supply. Connect a gauge manifold and
refrigerant supply to the fitting above valve
V-4. Turn the micron gauge On.
2. Close valves V-1, V-3 and V-4. Valve V-2 is
open.
3. Turn the vacuum pump On.
4. Open valve V-1 at the pump. The micron
gauge needle will move to the left. (See
micron gauge scale diagram—previous page).
NOTE: If the vacuum pump is okay, and
there are no leaks between V-1 and V-3, the
micron gauge should show less than 500
microns. If not, locate and correct the
problem.
5. With the pump still operating, open valve V-3.
If the micron reading does not return to a level
of less than 500 microns, locate and correct
the problem before continuing.
6. With the vacuum pump still operating, open
valve V-4. The micron level will rise
momentarily. If the micron reading does not
return to a level of less than 500 microns,
locate and correct the problem before
continuing.
Leak
Isolate the pump from the system by closing the
proper valve. Watch the movement of the vacuum
gauge needle. If the needle continues to rise, this
is an indication that a leak exists in the unit or the
connecting line. The leak must then be located
and eliminated.
Moisture
Should the needle show a pressure rise but
finally level off to practically a constant mark,
this is an indication that the system is vacuum
tight but is still too wet, requiring additional
dehydration and pumping time.
Summary of Contents for 919180
Page 4: ...4...
Page 10: ...Table of Contents 10...
Page 32: ...Unit Description 32 Unit Photographs Figure 3 Front View Figure 4 Back View AJA584 AJA585...
Page 33: ...Unit Description 33 Figure 5 Left Side View Figure 6 Right Side View AJA586 AJA58...
Page 35: ...Unit Description 35 Figure 8 North American Power Receptacle Box AJA58...
Page 38: ...Unit Description 38...
Page 58: ...Electrical Maintenance 58...
Page 66: ...Engine Maintenance 66 Figure 37 Fuel and Oil System Components...
Page 84: ...Engine Maintenance 84...
Page 96: ...Refrigeration Maintenance 96...
Page 118: ...Hilliard Clutch Maintenance 118...
Page 136: ...Cycle Diagrams 136...
Page 140: ...Wiring and Schematic Diagrams Index 140...
Page 141: ...141 Truck S Model SR 30 Schematic Diagram Page 1 of 2...
Page 142: ...142 Truck S Model SR 30 Schematic Diagram Page 2 of 2...
Page 143: ...143 Truck S Model 30 Units with P T Wiring Diagram Page 1 of 2...
Page 144: ...144 Truck S Model 30 Units with P T Wiring Diagram Page 2 of 2...
Page 145: ...145 Truck S Model 50 Schematic Diagram Page 1 of 2...
Page 146: ...146 Truck S Model 50 Schematic Diagram Page 2 of 2...
Page 147: ...147 Truck S Model 50 Units with P T Wiring Diagram Page 1 of 2...
Page 148: ...148 Truck S Model 50 Units with P T Wiring Diagram Page 2 of 2...