Remote Evaporator Unit Description
173
The SPECTRUM™ multi-temperature
refrigeration system provides heavy duty
temperature control for multiple compartment
trucks. The system provides direct expansion
cooling in all cargo compartments.
Heat and defrost is provided in all compartments
by circulating hot refrigerant gas through the
evaporators.
The remote evaporator are ceiling mounted units.
Controls for the remote evaporator(s) are located
in the SPECTRUM
™
TS HMI.
Unit Operation
The remote evaporator cycles between cool, null
and heat to maintain the cargo’s compartment(s)
at the setpoint. The operating modes include Cool,
Null, Heat and Defrost.
Power to run the direct current fan motor is
supplied by the alternator in the condensing unit.
When cooling is required, the SPECTRUM™ TS
microprocessor energizes the remote liquid line
solenoid valve. Refrigerant flows through the
evaporator coil to provide cooling.
When the compartment temperature is near
setpoint, the SPECTRUM™ TS microprocessor
de-energizes the remote liquid line solenoid valve
and switches the remote evaporator to null.
The SPECTRUM™ TS microprocessor energizes
the remote hot gas solenoid when the remote
compartment requires heat or defrost.
Defrost
The Defrost mode can be initiated any time the
evaporator coil temperature is below 45 F (7 C).
Defrost is initiated automatically by the controller
or manually by selecting the manual defrost.
The evaporator fan stops during defrost. The
Defrost mode will continue until the evaporator
coil temperature rises to 52 F (11 C), causing the
controller to terminate defrost. After defrost, the
evaporator may shift back to cool, null or heat.
Operating Modes
Remote evaporator operating modes are:
• Cool
• Null
•Heat
• Defrost
NOTE: The controller locks out heat at setpoints
below 15 F (-9.5 C).
Unit Features
• Direct Expansion Evaporator Coil
• SPECTRUM
™
TS Microprocessor
• 12 Vdc Fan Motor
• Aluminum Housing
• Liquid Line Solenoid
• Hot Gas Solenoid
• Suction Line Solenoid
• Liquid Return Check Valve
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