Unit Description
28
Engine Compartment
The following maintenance items can be checked visually.
Compressor Oil Sight Glass:
Use this sight glass to check
the compressor oil level. Check the compressor oil when there
is evidence of oil loss (leaks). Refer to the unit Maintenance
Manual for the correct procedure.
Engine Oil Dipstick:
Use the engine oil dipstick to check
the engine oil level.
Receiver Tank Sight Glass:
This sight glass indicates the
level of refrigerant in the receiver tank. Refer to the unit
Maintenance Manual for the correct procedure.
Operate the unit in high speed cool for approximately 15
minutes to stabilize operating conditions and temperature
before attempting to check the refrigerant.
NOTE: If the ball floats, there is sufficient refrigerant in the
unit for that load at that particular trailer temperature. This
test does not determine if the unit contains a full charge or an
overcharge of refrigerant.
Unit Protection Devices
Coolant Level Switch:
The coolant level switch closes if
the coolant level drops below an acceptable level. If it stays
closed for a specified time, the microprocessor records alarm
code 37.
Engine Coolant Temperature Sensor:
The microprocessor uses the engine coolant temperature sensor
to monitor the engine coolant temperature. If the engine
coolant temperature rises above an acceptable level, the
microprocessor records alarm code 41 and possibly 18. The
microprocessor might also shut the unit down.
WARNING: The unit can start at any time without
warning. Press the
O
FF
key on the control panel and
place the microprocessor On/Off switch in the Off
position before inspecting any part of the unit.
CAUTION: Make sure the engine is turned off before
attempting to check the engine oil.
