Remote Evaporator Unit Description
119
The Spectrum DE multi-temperature refrigeration
system provides heavy duty temperature control
for multiple compartment trailers. The system
provides direct expansion cooling in all trailer
compartments. Non-contaminating refrigerant
tap-ins in the host unit evaporator provide
convenient refrigerant piping connections for the
remote evaporator.
The host unit mounts on the front of the trailer
with the evaporator protruding into the trailer. The
remote evaporator is a ceiling mounted Spectrum
unit.
Heat and defrost is provided in all compartments
by circulating hot refrigerant gas through the
evaporators.
Controls for the remote evaporator are located on
the host unit (and in the optional remote control
box if so equipped).
Unit Operation
The remote evaporator cycles between cool, null
and heat to maintain the trailer’s compartment at
the setpoint. The operating modes include Cool,
Null, Heat, and Defrost.
Power to run the direct current fan motors is
supplied by the alternator in the host unit.
When cooling is required, the Smart Reefer
Multi-Temp µP-IV 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 Smart Reefer Multi-Temp µP-IV
microprocessor de-energizes the remote liquid
line solenoid valve and switches the remote
evaporator to null.
The Smart Reefer Multi-Temp µP-IV
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 defrost from the Defrost
Prompt Screen for the desired zone.
The evaporator fan stops during defrost. The
Defrost mode will continue until the evaporator
coil temperature rises to 58 F (14 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
•
Smart Reefer Multi-Temp µP-IV
Microprocessor
•
12 Vdc Fan Motor
•
Aluminum Housing
•
Liquid Line Solenoid
•
Hot Gas Solenoid
•
Suction Line Solenoid
•
Liquid Return Check Valve
Summary of Contents for Spectrum DE 30-2
Page 4: ...4...
Page 12: ...Safety Precautions 12...
Page 16: ...Specifications 16...
Page 31: ...Unit Description 31 1 Access Panels 2 Defrost Dampers Figure 12 Back View of Unit 1 2 AGA215...
Page 42: ...Operating Instructions 42...
Page 48: ...Electrical Maintenance 48...
Page 106: ...Structural Maintenance 106...
Page 110: ...Mechanical Diagnosis 110...
Page 114: ...Remote Evaporator Specifications 114...
Page 116: ...Remote Evaporator Maintenance Inspection Schedule 116...
Page 122: ...Remote Evaporator Electrical Maintenance 122...
Page 126: ...Remote Evaporator Refrigeration Service Operations 126...
Page 128: ...Remote Evaporator Structural Maintenance 128...
Page 130: ...Remote Evaporator System Diagnosis 130...
Page 134: ...Wiring and Schematic Diagrams Index 134...
Page 135: ...135 Schematic Diagram Page 1 of 2...
Page 136: ...136 Schematic Diagram Page 2 of 2...
Page 137: ...137 Wiring Diagram Page 1 of 4...
Page 138: ...138 Wiring Diagram Page 2 of 4...
Page 139: ...139 Wiring Diagram Page 3 of 4...
Page 140: ...140 Wiring Diagram Page 4 of 4...