Unit Description
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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.
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-3 automatically initiates timed
or demand defrost cycles. The SR-3 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.”
NOTE: The unit will not perform a Manual Defrost Cycle
unless the unit has been turned on with the O
N 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 7 C (45 F).
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