62-11640
2–18
2.13.3
Null Mode
The system will enter null mode during periods where
no cooling or heating is required and system is in con-
tinuous run. In null mode the compressor and heaters
are shut down while evaporator fans continue to oper-
ate. Condenser fan will operate if engine cooling is
required.
The system may also enter the null mode while in start
stop if required time, coolant temperature or battery
condition parameters have not been met.
2.13.4
Liquid Injection Mode
The control system monitors the signal provided by the
compressor discharge temperature sensor. If compres-
sor temperature rises to the limit (refer to
the system will enter Liquid Injection Mode. In this mode
the normally closed liquid injection valve (LIV) will be
pulsed or opened as required to allow flow of refrigerant
into the economizer line, to cool the compressor.
2.14 HEAT AND DEFROST
In Heat and Defrost Modes, the compressor is
de
−
energized. In Heat Mode, the coil mounted heaters
and evaporator fans are energized. Air flowing over the
warm coil is circulated throughout the refrigerated com-
partment to maintain cargo at desired temperature.
If the control system is Configured to allow Natural
Defrost, and the compartment temperature is above
freezing defrost may be accomplished using a combi-
nation of coil heaters and return air. If compartment
temperature is below freezing or not sufficiently warm
enough to defrost the coil, the evaporator fans are
de
−
energized and the coil mounted heaters energized.
Figure 2.9 Refrigeration Circuit Standard Mode
CSMV
COMPRESSOR
SUCTION
SERVICE VALVE
EVXV
COMPRESSOR
ECONOMIZER
CONNECTION
LIQUID LINE
SERVICE VALVE
COMPRESSOR
DISCHARGE
SERVICE VALVE
CONDENSER
SUBCOOLER
FILTER DRIER
LIV N/C
RECEIVER
FUSIBLE
PLUG
EVAPORATOR
EVOT EVOP
ECONOMIZER
ECXV
ECOP
ECOT
CDP
CDT
CST
CSP
MM
MM
DISTRIBUTOR
DISCHARGE FLOW
LIQUID FLOW
SUCTION FLOW
Summary of Contents for Vector 8500
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