CSR-20 & CSR-40, September 1999
General Description
The µP-D controller is a programmable microprocessor that
controls all unit functions to maintain the cargo at the proper
temperature. The controller contains the following basic fea-
tures:
1. Two digital displays:
• SETPOINT: Five alpha numeric characters: Numerical
tens, ones and tenths position, a C for Celsius or F for
Fahrenheit for temperature display.
• TEMPERATURE: Five alpha numeric characters:
Numerical hundreds, tens, ones and tenths position, a C
for Celsius or F for Fahrenheit for temperature display.
2. Ten control keys:
• SELECT: Press to select prompts and display screens
from controller menu.
• UP: Press to increase the setpoint or scroll UP through
controller menu.
• DOWN: Press to decrease the setpoint or scroll DOWN
through controller menu.
• ENTER: Press to load the setpoint (or other setting) and
execute other controller tasks.
• C/F (Temperature): Press to view alternate temperature
scale in display.
• RET/SUP (Temperature): Press to view alternate
return/supply sensor temperature.
• DEFROST: Press to prepare to initiate a manual defrost.
• PRETRIP: Press to prepare to initiate a Full Pretrip
Test.
• SOT (Start of Trip): Press to prepare to place Start of
Trip marker in the datalogger.
• ALARM: Press to view alarm codes that are present.
4
µµ
P-D Controller
µµ
P-D Controller
1. Status Indicator Lights
2. Setpoint (Left) Display
3. Temperature (Right) Display
4. Keypad
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