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TK 56218-2-OP-EN
switches can be installed. CargoWatch also logs the setpoint. Use a USB Port
to download the CargoWatch data. If optional temperature sensors are
installed, the readings are displayed as Datalogger Sensor (1-6) Temperature
in the sensor readings. See “Using the Sensors Key” in the Operating
Instructions Chapter.
OptiSet 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
customers’ needs. Contact your Thermo King dealer for information about
programming OptiSet Plus.
FreshSet
™
™
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.
A
Au
utto
om
ma
attiicc D
De
effrro
osstt:: 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.
M
Ma
an
nu
ua
all D
De
effrro
osstt:: In Manual Defrost mode, the operator initiates a defrost
cycle. Refer to “Initiating a Manual Defrost Cycle.”
N
No
otte
e:: The unit will not perform a Manual Defrost Cycle unless the unit has
been turned on with the ON key, the unit is running in Continuous or
CYCLE-SENTRY Mode (or shut down in CYCLE-SENTRY Null Mode),
and the coil temperature is below 45°F (7°C).
