62-12023 2-6
2.4.5 Evaporator Coil
The evaporator is a tube and fin type. The operation of the compressor maintains a reduced pressure within the
coil. At this reduced pressure, the liquid refrigerant evaporates at a temperature sufficiently low enough to absorb
heat from the air. Air movement over the evaporator is provided by an electric fan.
2.4.6 Low Pressure Switch (LP)
The low pressure switch is a normally closed switch which signals the microprocessor to shut down the unit when
the system is outside the low pressure limit. For LP settings refer to Section 2.6.2.
2.5 System Operating Controls and Components
The unit is furnished with a microprocessor control system. Once the setpoint is entered at the Cab Command, the
unit will operate automatically to maintain the desired temperature within very close limits. See Section 3.1.1.
Beware of unannounced starting of the unit. The unit may cycle the fans and one of the operat-
ing compressors unexpectedly as control requirements dictate. To ensure unit is without
power, remove power plug and remove battery negative cable.
Under no circumstances should anyone attempt to repair the microprocessor module or either
Cab Command module! Should a problem develop with these components, contact your near-
est Carrier Transicold dealer for replacement.
Figure 2.4 Cab Command - Road Only Units
Figure 2.5 Cab Command Two - Standby Units
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