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residential ac evaporator freeze on unico

Thread starter knut
Start date Apr 28, 2002

Status: Not open for further replies.

Apr 28, 2002

knut

Electrical

I have a unico (high velocity) mini duct system with two zone dampers. When one zone is closed the anti-freeze limit switch at the cooling coil opens. The hvac contractor installed a bypass damper between the supply and return. This damper remains partially open even when both zones are open. Could this damper be the problem?