If any of the critical control parameters exceed limits, the compressor is turned off and an alarm condition is indicated on the front panel.
There are three main conditions that can shut the AC compressor down:
- The condenser high temperature alarm
- The evaporator coil alarm
- The compressor thermal overload
In the event that the condenser coil overheats, a condenser high temperature alarm, HA2, will flash on the display of the digital temperature controller and the compressor will turn off after a 3 minute time delay.
In the case that the evaporator coil ices up or there is a leak, an evaporator coil alarm, CA, will flash on the display of the digital temperature controller and the compressor will turn off after a 2 minute time delay.
A thermal overload protects the compressor against faults. In the event that the snowflake status LED is not flashing on the display and the compressor is not running, an internal fault may have occurred on the unit. Refer to the Troubleshooting Guide in this manual.