4 • Carel Controller - Basic Operations
CAREL CONTROLLER
Basic Operations
1. Temperature Display: The temperature of the case is displayed here. When the case is in defrost mode, this display will read DEF.
2. When lit, this icon indicates the compressor is running.
3. When lit, this icon indicates the fans are running.
4. When lit, this icon indicates the defrost heater is activated.
5. This icon flashes in an alarm situation.
6. Buttons:
a. Prg/mute: This button is used to silence the audible alarm. The alarm will re-energize after 60 minutes if the condition that caused it
has not been corrected. This button is also used to make basic changes to the program and should be used only by a qualified service
technician.
b. Set: This button is used to program the control and should be used only by a qualified service technician.
c. Up Arrow/aux: This button is used to program the control and should be used only by a qualified service technician.
d. Down Arrow/def: This button is used to program the control and should be used only by a qualified service technician.
Basic Case Operations
1. The case’s condensing unit (mounted on top of the case) cycles off and on 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 medium temp cases, the fans run all of the time. On low temp cases, the fans run when the evaporator temperature is below 30ºF,
except when in defrost.
3. The case goes into defrost two times per day. The defrost lasts between 30 and 50 minutes. At the end of the defrost, the low temp doors
may fog on the inside. This is normal. During the defrost, the air in the ducts can warm up to 40ºF for a medium temp case and 60ºF for a
low temp case. Product temperatures within the case will not rise above acceptable levels, however. Product in medium temp cases will
remain at or below 41ºF and product inside low temp cases will remain frozen.*
4. The lights remain on at all times unless the light switch located in the right-hand door frame is switched off.
5. The water removal system has a maximum capacity of two gallons. When cleaning the interior of the case, do not use more than this
amount of liquid.
*Please consult the Zero Zone Service Department on case defrost characteristics for non-standard defrost settings.
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