Unit Description
32
Unit Instruments
• Coolant Expansion Tank-The coolant level
and temperature are monitored by the
SPECTRUM
™
TS Microprocessor controller.
If the coolant temperature becomes too high or
the level becomes too low, an alarm will occur
and the engine will shut down.
The engine must have antifreeze protection to
–30 F (–34 C). Check and add coolant in the
expansion tank as needed.
• Compressor Oil Sight Glass-The compressor
oil sight glass is used to check the relative
level of compressor oil in the compressor
sump.
• 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 check the amount of
refrigerant in the system, and the moisture
content of the refrigerant.
Unit Sensors
The sensors monitor temperatures and pressures at
various points in the system as well as oil
pressure, oil and coolant levels and engine speed.
Graded and Ungraded Sensors
The Return Air and Discharge Air sensors are
graded sensors. This feature allows accuracy
without the need for ice water calibration. The
sensor grade (from 1L thru 9H) is stamped on the
sensor and must be entered into the
microprocessor when a sensor is changed in order
to properly calibrate temperature readings. An
ungraded sensor is used to measure the evaporator
coil temperature and ambient temperature since
these temperatures are not as critical as Return
and Discharge air temperatures.
• Return Air Sensor - monitors the
temperature of the air returning to the remote
evaporator coil. The sensor is located in the
return air flow and is connected directly to the
SPECTRUM
™
TS Microprocessor. The unit
controls on this sensor under normal
conditions. This is a graded sensor and must
be replaced with a graded sensor. The
SPECTRUM
™
TS Microprocessor must be
calibrated to the sensor grade of the sensor
installed in the return air position in order to
operate properly. It is connected to the
microprocessor via the RTP and RTN wires.
• Discharge Air Sensor - monitors the
temperature of the air leaving the evaporator
coil. The sensor is located in the remote
evaporator discharge air path and is connected
directly to the SPECTRUM
™
TS
Microprocessor. The unit will control on this
sensor if the return air sensor fails or if
discharge air sensor control is selected. This is
a graded sensor and must be replaced with a
graded sensor. The microprocessor must be
calibrated to the sensor grade of the sensor
installed in the discharge air position in order
to operate properly. It is connected to the
microprocessor via the DTP and DTN wires.
• Coil Temperature Sensor - monitors the
temperature of the evaporator coil. The sensor
is located on the remote evaporator coil header
plate and is connected directly to the
micro-processor. This is not a graded sensor.
It is connected to the microprocessor via the
CTP and CTN wires.
• Ambient Temperature Sensor - monitors the
ambient air temperature. The sensor is located
in the main unit and is connected directly to
the microprocessor. This is not a graded
sensor. It is connected to the microprocessor
via
the ATP and ATN wires.
CAUTION: Do not add Green or
Blue-Green, conventional coolant to
cooling systems using Red, Extended Life
Coolant, except in an emergency. If
conventional coolant is added to Extended
Life Coolant, the coolant must be changed
after 2 years instead of 5 years.
CAUTION: Do not remove expansion
tank cap while the coolant is hot.
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