44 • Controller Operation
CONTROLLER OPERATION
Basic Case Operations
1. The case’s condensing unit (mounted on top of the case on a Hybrid
™
) cycles on and off during normal operation. When the inside of the
case is warm, the compressor turns on. When the inside of the case is cold, the compressor turns off.
2. On coolers, the fans run all of the time. On freezers, the fans run when the evaporator temperature is below 30ºF, except when in defrost.
3. at the end of the defrost, the freezer doors may fog on the inside. This is normal. During the defrost, the air in the ducts can warm to 40ºF
for a medium temp case and to 60ºF for a low temp case. Product temperatures within the case will not rise above acceptable levels,
however. Product in freezers will remain frozen. Product in coolers will remain at or below 41ºF.*
*Please consult the Zero Zone Service Department on case defrost characteristics for non-standard defrost settings.
Defrost Schedule
REACH-IN FREEZERS
1 to 2-door freezers: 1 time per day (8:00 aM); defrost time of 30 minutes.
3 to 5-door freezers: 1 time per day (8:00 aM); defrost time of 40 minutes.
Ice Merchandisers: 2 times per day (8:00 aM, 8:00 PM); defrost time of 40 minutes each.
REACH-IN COOLERS
1 to 6-door coolers: 3 times per day (4:00 aM, 2:00 PM, 8:00 PM); defrost time of 45 minutes each.
OPEN MULTI-DECK COOLERS
4' to 12' open coolers: 4 times per day (4:00 aM, 10:00 aM, 4:00 PM, 10:00 PM); defrost time of 30 minutes each.
Silencing the Carel IR33+ Temperature alarm
If the alarm sounds, it can be silenced for 1 hour by pressing the [PRG] button on the controller. The controller is visible through the cutout in
the shroud. For more information, see the
at the end of this manual.
Press the PRG/MUTE button
to silence the alarm for 1 hour
