17
Safe-Net III Operation (Cont'd)
• Rear connections
- Case temperature sensor;
• Typically senses the temperature of the air in the
case.
Used by the controller to determine when to power
on or power off the compressor or refrigeration.
- Evaporator temperature sensor:
• Senses the temperature of the refrigeration coil.
Terminates a defrost cycle when refrigeration coil ice
melts.
- Compressor or refrigeration relay:
• Switches on the compressor or refrigeration valve
for cooling.
WARNING
!
The optional evaporator fan remains ON
when the adjustment knob is in the OFF
position.
DISPLAY
The display includes three red LEDs and two digits for
temperature, defrost status, and error codes.
The three display LEDs are red, and their behavior
matches the LEDs on the controller.
START-UP
1. Plug in the merchandiser.
WARNING
!
The OFF Position does not disconnect line
voltage to the case, refrigeration unit, fan,
or heater.
2. Wait for the self check to complete. During the self
check, each LED fl ashes for one second, then all
LEDs turn on for two seconds. If the LEDs do not
fl ash, make sure the adjustment knob is not in the
Off position.
• After the self check, all LEDs turn off until the
compressor starts.
There may be a delay before
the compressor starts
. If the red Temperature or
Sensor Alarm LED stays on after the self check.
• The green Compressor Powered On LED turns on
when the compressor starts.
NOTE: Do NOT load product until AFTER
merchandiser operates for 24 hours and reaches
desired operating temperature.
WARNING
!
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area.
