Unit Description
21
DAS (Optional)
The DAS (Data Acquisition System) is an
independent data logger that logs information
from dedicated external DAS sensors and inputs.
The DAS features up to six directly connected
sensors. The DAS is also connected through a
serial port to the unit microprocessor. This allows
unit operating information to be logged as well.
The data can be retrieved using an IBM
®
PC
compatible laptop or desktop computer and
Thermo King WinTrac
TM
4.1 (or higher)
software. The computer is connected to the
Computer Port on the front of the control box.
Detailed graph or table trip reports can then be
created. A brief graphical or tabular report can be
printed on a compatible printer (P/N 204-844 or
P/N 204-1020). The printer is connected to the
Printer Port on the front of the control box. Refer
to the DAS Data Acquisition System Manual
TK 50565 for more information.
Remote Control Box (Optional)
The remote control box is mounted in a remote
location (such as inside the trailer) and is used to
operate the unit. Each zone can be turned on and
off and the setpoints can be changed. Refer to the
Operator’s Manual or the appropriate
Microprocessor Diagnosis Manual for complete
information about the operation of the remote
control box.
Sequence of Operation
The Zone 1/Host On/Off switch must be turned
On before any other zone will operate. When the
Zone 1/Host On/Off switch is turned On, the
backlight illuminates the display and the operating
icons appear. The unit will start automatically in
both Continuous Run and CYCLE-SENTRY
modes.
The microprocessor uses a complex program to
determine which operating mode each zone
should be in. Therefore, it is difficult to predict
which operating mode an evaporator should be in
by comparing its setpoint to the compartment
temperature. Also, the different versions of
software that are used have some operational
differences.
Each zone that is turned on will operate in one of
the following modes:
• Cool
• Heat
• Defrost
• Null
During engine operation, engine speed is
determined by a combination of the requirements
of each zone and the discharge pressure. The
diesel engine will operate in High or Low Speed
accordingly.
Defrost
Defrost is initiated automatically by the
microprocessor or manually by selecting defrost
from the Defrost Prompt Screen for the desired
zone. A Demand Defrost cycle will also occur
based on the return air temperature and discharge
air temperature or coil temperature. The
evaporator coil temperature must be below 45 F
(7 C) to allow defrost. When the Defrost Icon for
a zone appears, the damper door is closed or the
fans are turned off. Several defrost features are
programmable. The unit is designed to defrost in
low speed.
The zone will stay in defrost until the evaporator
coil temperature rises to 58 F (14 C). If the
evaporator coil temperature does not rise above
58 F (14 C) within the Defrost Duration (DDUR)
time limit, the microprocessor will terminate
defrost and display the Alarm Icon. The Defrost
Duration can be set for either 30 or 45 minutes.
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