10
UNIT DESCRIPTION
CYCLE-SENTRY
TM
SYSTEM
The CYCLE-SENTRY
TM
fuel saving system
provides optimum operating economy.
The CYCLE-SENTRY
TM
system automatically
starts the unit on microprocessor demand and
shuts down the unit when all demands are
satisfied.
The system monitors and maintains the
compartment temperature, the engine block
temperature, and battery charge levels at a point
where quick, easy starts are possible.
DEFROST
Frost will gradually build up on the evaporator
coils as a result of normal operation.
Periodically this frost must be melted to
prevent a loss of cooling and airflow.
Defrost is accomplished by passing hot
refrigerant gas through the evaporator coil, thus
melting the frost (or ice). Melted frost drains
out of the unit onto the ground through the
drain tubes. The defrost damper closes during
defrost to prevent warm air from entering the
cargo area. The optional electric heater strips
are also energized in defrost during electric
standby operation.
Defrost can be initiated at any time the
evaporator coil temperature is below 42 F
(5.5 C).
There are two methods of defrost initiation:
TSR/TSR-3 Microprocessor Controller
The Microprocessor Controller is programmed
to automatically initiate timed and forced
defrost cycles. The TSR/TSR-3 uses
temperature sensors to determine if forced
defrost is required.
Manual Defrost
Manual Defrost allows the operator to initiate a
defrost cycle by pressing the DEFROST key.
See “Initiating a Manual Defrost Cycle.”
DAS - DATA ACQUISITION SYSTEM
(OPTIONAL - EXCEPT ON T-500R)
The DAS (Data Acquisition System) monitors
and records the temperatures of (up to) six
additional sensors. The sensors are independent
from the microprocessor controller and are
normally located in the truck box to monitor
load temperatures. DAS data can be
downloaded through a serial port to an IBM
®
PC compatible computer. WinTrac™ 4.8 (or
higher) software is used to view and analyze
the data. Brief reports can be printed on a
microprinter connected to the serial port.
Turn the unit off by pressing the OFF
key before opening doors or
inspecting any part of the unit. The
unit can start at any time without
warning if it has been turned on by
pressing the
ON key.
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