The recent installation of permanent heat traces around the LLCV needle valve valve bodies for CP1 and CP2 solved 1/2 of the nuisance freezing problem.  Now the actuator box is freezing up (These units were installed upside down for some reason and are prone to moisture entry and subsequent freezing) -> I am using drop lights with 25 watt bulbs as general heat sources as an interim solution for now.  

Operators note that I'm am monitoring CP1 and CP2 levels periodically and additional alarms are likely overnight.  No action is required.