Unit Description
22
Engine Compartment
Components
Coolant Expansion Tank
The coolant level and temperature are monitored by the base
controller. If the coolant temperature becomes too high or the
level becomes too low, an alarm will occur.
The engine must have antifreeze protection to -34 C (-30 F).
Check and add coolant in the expansion tank as needed.
Engine Oil Dipstick
Use the engine oil dipstick to check the engine oil level.
Receiver Tank Sight Glass
The receiver tank sight glass is used to assist in checking the
amount of refrigerant in the system.
Compressor Oil Sight Glass
The compressor oil sight glass is used to check the relative
level of compressor oil in the compressor sump.
Unit Protection Devices
High Pressure Cutout Switch (HPCO): This normally
closed switch monitors the discharge pressure at the
compressor. It opens on high discharge pressure to shut the unit
down to prevent damage.
Electronic Throttling Valve (ETV) -: (T-1200R, T-1200R
SPECTRUM):
This component is an electromechanical control device used to
limit the suction pressure to the compressor. The valve is
controlled by the microprocessor controller.
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.
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