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Unit Description
25
Unit Instruments
Microprocessor LCD Display:
The display screen
normally shows the setpoint, the return air
temperature, and any active icons, which are:
•
Cool
•
Heat
•
Defrost
•
Setpoint
•
CYCLE-SENTRY
•
Alarm
•
Electric (Optional).
Pressing the
S
ELECT
key causes the display to show
the other sensor readings.
Alarm Icon:
The Alarm icon comes on whenever
there is an alarm code stored in the
microprocessor memory.
Receiver Tank Sight Glass:
The receiver tank sight
glass is used to check the amount of refrigerant in
the system, and the moisture content of the
refrigerant.
Compressor Oil Sight Glass:
The compressor oil
sight glass is used to check the relative level of
compressor oil in the compressor sump.
Air Restriction Indicator (if equipped):
Standard
with dry element only. It is not used with oil bath
filter. An air restriction indicator is attached to the
intake manifold. Visually inspect the restriction
indicator periodically to assure the air filter is not
restricted. Service the air filter when the yellow
diaphragm indicates 25 in. (635 mm) of H
2
O.
Press the button on the top of the restriction
indicator after servicing the air filter.
Remote Light Indicators (Optional):
Remote
indicator lights in a box that can be mounted on
the truck beneath the unit feature these signals:
White—System is in Cooling cycle
Yellow—System is in Defrost cycle
Amber—System is in Heat cycle
Blue—System is in High Speed Heat or Cool
Green—System is on
Unit Protection Devices
Fuses:
A number of fuses are located on the relay
board. The sizes and functions are shown in the
following table.
High Pressure Cutout:
The high pressure cutout is
a pressure sensitive switch that is located in the
compressor discharge tube. If the discharge
pressure rises above 470 psig (3241 kPa) for
R-404A systems, the switch opens the 8H circuit,
which stops the unit.
Table 1: Relay Board Fuse Size and
Function
Fuse
Size
Function
F200
3A
2P Power to Microprocessor
F202
3A
Oil Level Switch
F300
3A
Pilot Solenoid
F301
3A
TherMax
TM
Solenoid
F302
3A
Alternator Relay
F303
3A
Damper Relay
F304
3A
Starter Relay
F305
3A
On/Run Relay
F306
3A
Preheat Relay
F037
3A
Not Used
F308
3A
Not Used
F309
15A
Alternator Excitation
F310
15A
Damper Solenoid
F311
10A
Motor Reset Solenoid
F400
5A
Motor Starter
F401
10A
Fuel Solenoid and Fuel Pump
F402
10A
Throttle Solenoid
F403
3A
Heater Contactor
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...