Thermo King Precedent S-600, Operator'S Manual

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Unit Description
29
OptiSet
TM
Plus
OptiSet Plus is a group of programmable functions that control
how the unit will operate with specific setpoints or named
products. This assures that when a particular setpoint or named
product is selected, the unit will always operate the same way.
This allows an entire fleet to be configured to match the
customers’ needs. Contact your Thermo King dealer for
information about programming OptiSet Plus.
FreshSet
TM
FreshSet is included in OptiSet Plus. FreshSet is a demand
base temperature control for fresh products. FreshSet modifies
and adjusts unit airflow operation to control temperature and to
maximize protection of cargo, while keeping operating costs to
a minimum. Contact your Thermo King dealer for information
about programming FreshSet.
Defrost
Frost gradually builds-up on evaporator coils as a result of
normal operation. The unit uses hot refrigerant to defrost the
evaporator coil. Hot refrigerant gas passes through the
evaporator coil and melts the frost. The water flows through
collection drain tubes onto the ground. The methods of defrost
initiation are Automatic, and Manual.
Automatic Defrost: The SR-4 automatically initiates timed
or demand defrost cycles. The SR-4 microprocessor can be
programmed to initiate timed defrost cycles at intervals of 2, 4,
6, 8, or 12 hours. Demand defrost cycles occur if the
differences between the return air temperature, discharge air
temperature, and coil temperature exceed certain limits. The
unit can enter defrost cycles as often as every 30 minutes if
required.
Manual Defrost: In Manual Defrost mode, the operator
initiates a defrost cycle. See “Initiating a Manual Defrost
Cycle.”