Electrical Maintenance
55
Condenser/Evaporator Fan
Rotation (Electric Standby
Operation)
The condenser and evaporator fans are belt
driven. On electric standby operation, check for
correct fan rotation by placing a small cloth or
sheet of paper against the condenser fan grille on
the front of the unit. Correct rotation will hold the
cloth or paper against the grille. Improper rotation
will blow the cloth or paper away from the grille.
To correct check motor and motor contactor
wiring as per wiring diagram, incorrect power
cord wiring may give an alarm code 38.
Defrost Air Switch Checkout
and Adjustment
Before testing or adjusting the air switch, check
the clear plastic tubing and black plastic tubing to
the evaporator coil. Make sure they are not
obstructed or crushed. Check the probes in the
evaporator housing to be sure they are in proper
position, and make sure they are not obstructed.
1. Remove plastic sensing tubing from both sides
of the defrost air switch.
2. Disconnect one wire at switch terminal.
Connect test light or continuity tester to the
two terminals used on the switch.
3. Install test equipment (see Tool Catalog) onto
the hose fitting on the side of the air switch
stamped BLACK.
4. Pressurize the hose until the continuity tester
indicates a completed circuit. Now read the
dial of the test gauge. This is the setpoint of
the air switch (correct reading is
0.70 ± 0.05 in. [17.8 ± 1.3 mm] H
2
O).
Release the pressure.
5. If the switch is out of calibration, pressurize
the hose again until the tester indicates
0.70 in. (17.8 mm) H
2
O. Adjust the screw
clockwise or counterclockwise until the
switch closes and the continuity tester
indicates a completed circuit with the gauge
reading 0.70 in. (17.8 mm) H
2
O. Release the
pressure.
1.
Magnetic Pressure Gauge
2.
Squeeze Bulb Tool
3.
Continuity Tester
Figure 30: Testing Air Switch
1.
Adjustment Screw
Figure 31: Air Switch
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...