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UNIT DESCRIPTION
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.
Engine Oil Pressure Switch/Sensor:
The engine oil pressure switch/sensor is located on the filter head above
the bypass oil filter. Engine oil pressure should rise immediately on
starting. If engine oil pressure drops below 10 ± 2 psig (69 ± 14 kPa), the
switch/sensor signals the microprocessor to stop the engine.
Preheat Buzzer
The preheat buzzer sounds when the CYCLE-SENTRY
TM
system
energizes the glow plugs. This should warn anyone near the unit that the
CYCLE-SENTRY
TM
system is about to start the diesel engine.
Coolant Temperature Sensor
This sensor provides an engine coolant temperature input to the
microprocessor. If the engine coolant temperature is too high, the
controller stops the unit and records an alarm.
Electric Motor Overload Relay (Model 50)
The overload relay protects the electric standby motor. The overload
relay opens the circuit from the contactor to the electric motor if the
motor overloads for any reason and an alarm will occur. The relay resets
when the alarm code is cleared.
Fuses
Sizes and functions are described in the Specifications section of this
manual.
T500R runs 3 electric evaporator fans. Independantly fused.
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