Thermo King 914970, Manual

Page: 37 / 186

Operating Instructions
37
Since highly sensitive products will normally
require continuous air circulation,
CYCLE-SENTRY units come equipped with a
selector switch for CYCLE-SENTRY or
Continuous Run operation. Your selection of the
operation mode for the proper protection of a
particular commodity should use the following
guidelines.
Examples of Products Normally
Acceptable for CYCLE-SENTRY Operation
• Frozen foods (in adequately insulated trailers)
• Boxed or processed meats
• Poultry
• Fish
• Dairy products
• Candy
• Chemicals
• Film
• All non-edible products.
Examples of Products Normally Requiring
Continuous Run Operation of Air Flow
• Fresh fruits and vegetables, especially
asparagus, bananas, broccoli, carrots, citrus,
green peas, lettuce, peaches, spinach,
strawberries, sweet corn, etc.
• Non-processed meat products (unless
pre-cooled to recommended temperature)
• Fresh flowers and foliage.
The above listings are not all inclusive. Consult
your grower or shipper if you have any questions
above the operating mode selection on your type
of load.
Continuous Run Operation
With the selector switch in the Cont Run position,
the CYCLE-SENTRY unit will operate in its
regular cooling and heating modes. Refer to
“Manually Starting Units on Diesel Operation” on
page 36 or “Starting the Unit—CYCLE-SENTRY
Units on Diesel Operation” on page 36.
CYCLE-SENTRY Operation
With the selector switch placed in the
CYCLE-SENTRY position, the
CYCLE-SENTRY system shuts down the unit
when the compartment temperature reaches the
thermostat setpoint, and restarts the unit on
thermostat demand.
On CYCLE-SENTRY equipped units, the unit
start-ups may also be initiated by Defrost cycle
initiation or engine block temperature switch
demand.
If Defrost is initiated either manually, or
automatically by the defrost timer, the unit will
start and run in Defrost. When the Defrost cycle is
complete, the unit will run in whichever operating
mode the thermostat demands until the
compartment temperature reaches setpoint.
In cold ambients, the CYCLE-SENTRY system
automatically maintains engine temperature by
restarting the unit if the engine block temperature
drops to 30 F (-1 C). When the unit starts up
because of low engine block temperature, the unit
will run in whichever operating mode the unit
thermostat is calling for until the battery is fully
charged and the engine block temperature rises to
90 F (32 C).
After the unit starts from thermostat demand,
Defrost initiation, or engine block temperature
switch demand, a Battery Sentry switch monitors
the voltage across the field of the alternator and
will keep the unit running until the battery is
recharged sufficiently. The unit runs in whichever
operating mode the thermostat demands to
properly maintain the compartment temperature.
When the battery is sufficiently recharged, the
unit will shut down on thermostat demand.
NOTE: A buzzer sounds when the unit is
automatically preheating.
CAUTION: With the Auto Start/Stop -
Continuous Run switch in the
CYCLE-SENTRY position and the On/Off
switches in the On position, The unit may
start at any time without prior warning.