Carel IR33+ Controller - Conditions that Trigger the Alarm • 7
CAREL IR33+ CONTROLLER
Conditions that Trigger the Alarm
Your low temp case has one or two defrosts programmed per day; one at 8:00 AM and one at 8:00 PM, or a single defrost at either 4:00 AM or
8:00 AM. A typical defrost lasts one hour. Your medium temp case has two or three defrosts programmed per day; one at 8:00 AM and one at
8:00 PM for two defrosts, and 4:00 AM, 2:00 PM, and 8:00 PM for three defrosts. If the alarm sounds during this time, please allow an additional
one-hour recovery time before calling for service.
If the alarm sounds outside of the above times, please review the following checklist. If you’ve checked all of these items and the case still does
not work properly, submit a service request.
Cases with electronic controls (a digital display cut into the shroud above the doors) have a one-hour alarm delay after defrost. The controller
has a 10ºF high alarm set point for low temp and 50ºF for a medium temp. The controller has a -20ºF low alarm setpoint for low temp and 28ºF
or 30ºF for medium temp. The alarm will sound when the sensed temperature is at or above 10ºF for a period of 60 minutes. If the temperature
drops below 10ºF during this 60 minutes, the alarm timer will reset. If the case is in defrost, the electronic display will read “DEF”.
Common Things to Check
DEFROST AND ALARMS
1. Check the circuit breakers for the cases. Tripped circuit breakers will cut off the power to the cases and to the alarms. Do not turn off
case refrigeration overnight when closing the store.
2. Reach-in door low temp cases have a one-hour defrost. Check the following before you enter a service request.
Determine when the defrost cycle started (typically at 8:00 AM and 8:00 PM for two defrosts and either 4:00 AM or 8:00 AM for one
defrost). Please wait one hour and double check case status before calling for service.
The fans turn off during defrost and for a few minutes after defrost.
Has the case just been stocked? (Warm product will take 24 hours to cool down.)
Is the case heavily shopped? (Frequent door opening will warm the case.)
Do not block return air grills at the bottom of the low temp case.
3. Reach-in door medium temp cases also have a defrost time. Check the following before you enter a service request.
Medium temp fans run while in defrost and lights remain on.
Typically medium temp cases defrost at 8:00 AM and 8:00 PM for two defrosts and 4:00 AM, 2:00 PM, and 8:00 PM for three defrosts.
Has the case just been stocked? (Warm product will take 24 hours to cool down.)
Is the case heavily shopped? (Frequent door opening will warm the case.)
