Thermo King 914970, Manual

Page: 34 / 186

Operating Instructions
34
Unit Indicators
Remote Light Indicator Box (Optional):
The
optional Remote Light Display mounts on the
truck for convenient indication of the unit’s
operating mode. The following conditions are
indicated by the respective light(s) being On:
a. Cool (White). The unit is cooling.
b. Defrost (Tan). The unit is defrosting.
c. Heat (Amber). The unit is heating.
d. High Speed (Blue). When the blue light
and white light are On at the same time,
the unit is in high speed cool. When the
blue light and amber light are On at the
same time, the unit is in High Speed Heat.
e. CYCLE-SENTRY (Green). The unit is in
CYCLE-SENTRY mode.
f. Fuel Saver (Light Blue). Not used.
g. Check Light (Orange). Not used.
h. In Range (Blue/Green). Not used.
Hourmeters:
The hourmeter records the number of
hours the unit is in diesel operation for proper
maintenance intervals. An electric hourmeter
(hours in electric operation) and a total hourmeter
(total operating hours) are optional equipment.
Digital Thermometer:
A digital thermometer is
built into each thermostat. The thermometer
normally indicates the return air temperature.
Receiver Tank Sight Glass:
This sight glass is used
to check the amount of refrigerant in the system.
Compressor Oil Sight Glass:
The compressor oil
sight glass indicates the relative level of
compressor oil in the compressor sump.
Engine Oil Dipstick:
Use the engine oil dipstick to
check the engine oil level.
Coolant Tank:
This gauge indicates the engine
coolant level. If the pointer is in the FULL (white)
range, the coolant level is acceptable. If the point
is in the ADD (red) range, add coolant to the
expansion tank.
Unit Protection Devices
Engine Reset Switch:
A thermal type manual reset
switch protects the engine. The reset switch
contains a heater coil that is attached to a sensor
switch in the engine oil system, engine coolant
system and the (optional) CYCLE-SENTRY
system.
When the engine oil pressure is too low, when the
starter exceeds the cranking limit on Auto
Start/Stop operation, or when the engine coolant
temperature is too high, the coil in the reset switch
begins to heat up. In 20 to 40 seconds, the switch
will open and shut down the unit. To reset the
engine reset, press the engine reset button.
Overload Relay/Electric Motor Reset Switch
(Model 50):
The overload relay protects the
electric standby motor. The overload relay opens
the circuit from the linestarter to the electric motor
if the motor overloads for any reason, (e.g., low
line voltage or improper power supply) while the
unit is on Electric Standby operation. To reset the
electric motor, press the motor reset button which
is located on the high voltage box.
1. Cool Light
2. Defrost Light
3. Heat Light
4. High Speed Light
5. CYCLE-SENTRY Light
6. Fuel Saver Light
7. Check Light
8. In Range Light
Figure 6: Remote Light Indicator Box
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CAUTION: Do not remove expansion
tank cap while the coolant is hot.