Controller Operation • 43
CONTROLLER OPERATION
Basic Carel IR33+ Operations
Carel IR33+ Display Legend
KEYPAD LOCATIONS
1. Temperature Display: The temperature of the case is displayed here. When the case is in defrost mode, this display will read “DEF”.
2. Compressor:
When lit, this icon indicates the compressor is running. It flashes when activation is delayed or inhibited by protection times.
3. Fan:
When lit, this icon indicates the fans are running. It flashes when activation is delayed by protection times or other procedures in
progress.
4. Defrost:
When lit, this icon indicates the defrost heater is activated. It flashes when activation is delayed by protection times or other
procedures in progress.
5. AUX output:
When lit, this icon indicates AUX output 1 or 2 is active. It flashes when anti-sweat heater function is active.
6. Alarm:
When flashing, there is an alarm during normal operation (e.g. high/low temperature alarm) and/or a malfunction.
7. Clock: When lit, this icon indicates Real Time Clock (“RTC”
) has been set and is available. When flashing, there is a clock alarm and
Error Time Clock (“Etc”) will be displayed. This means that the “RTC” has failed.
8. Service:
When flashing, a malfunction has occured (e.g. Electrically Erasable Programmable Read-Only Memory (EEPROM) errors or
faulty probes).
BUTTONS:
9. PRG/MUTE:
Accesses the type “
F
” parameters (frequent) or the menu for setting the password to access the type “
C
” parameters
(configuration) if pressed for more than three seconds. If there is an active alarm, it mutes the audible alarm.
If this button is pressed and held for more than five seconds at start-up, it will activate the procedure for setting the default factory
parameters. Contact Zero Zone before performing this procedure; it can erase your IR33+ program settings.
note: PRG+ON-OFF/UP resets any alarm with manual reset if pressed together for more than three seconds.
10. ON-OFF/UP: Switches the controller On if pressed for more than one second. If pressed for more than three seconds, it switches the
controller OFF. When setting the parameters, it increases the value displayed or scrolls to the next parameter.
11. AUX/DOWN: activates/deactivates the auxillary output if pressed for more than one second. When setting the parameters, it decreases
the value displayed or scrolls to the previous parameter.
12. SET/DEF: Displays and/or lets the user set the set point if pressed for more than one second. also used to enter settings of parameters.
CAUTION: If pressed for more than five seconds, it starts a manual defrost.
