8
CU M
M = Master Evaporator CU= Condensing unit
Start-Up Operation

SINGLE SYSTEM with 1 EVAPORATOR

•Check all wiring connections to be sure they are correct and tight.
•On condensing unit
- Check the setting of Time Delay relay. It should be set at 1 minute (the
second marker).
- Check the Low Pressure switch setting on freezer units. It must be set to 0
PSIG cutout, 10 PSIG cut-in to allow positive start and operation, especially
in cold ambients. This can be changed to a higher value in warmer climates.
On cooler units, the Low Pressure switch has a fixed setting and cannot be
adjusted.
•Turn power on
•On the evaporator
- Use the “PROGRAM REVIEW” button to scroll through settings.
- Check “

rEF

” (Refrigerant Type). Factory defaults are: Air Defrost R-22,
Electric Defrost R-404A. Change to the refrigerant being used.
- Check
“bot”
(Box Temperature). Factory defaults are: air defrost 35°F and
electric defrost –10°F. Change to the desired temperature.
- Review and change other setting if necessary
- See procedures below on how to change settings.
Start-Up Operation