Check Heat Cycle
refrigeration
Description
Check heat cycle means the unit has been in heat cycle more than five minutes while SAT stays more than 5.5b0F (3b0C) colder than RAT for over 60 seconds, and the unit shuts down and alarms.
Activation Conditions
The unit has been operating in the heat cycle for more than five minutes, and the SAT is more than 5.5°F (3°C) colder than the RAT constantly for more than 60 seconds. (Unit is actually cooling the air going through the evaporator).
Unit Behavior
Shutdown and alarm.
Reset Conditions
Auto reset after 15 minutes or alarm may be manually reset using the display mounted keys or by turning the START/RUN-OFF switch OFF and then back On again.
Corrective Actions
1. Perform Pretrip Check: Run Pretrip and check for alarms. Any active alarms must be corrected and cleared before proceeding. 2. Refer to Section 1.3.6, Refrigeration System Not Heating