Our Projects
Freeze Protection Logic Recovery
Freeze Protection Logic Recovery
An RTU repeatedly entered freeze conditions during winter operation.
Problem
Freeze trips caused nuisance shutdowns and occupant complaints.
Approach
Reviewed sequence logic, discharge temperature trends, and economizer operation.
Solution
– Added staged freeze protection sequence
– Forced OA dampers closed during low temperature events
– Added preheat enable and recovery timers
Results
– Added staged freeze protection sequence
– Forced OA dampers closed during low temperature events
– Added preheat enable and recovery timers