Electrical Troubleshooting Quiz, Oct. 22, 2013

How to keep HVAC condensing units from icing up frequently during summer nights.

Last summer, several HVAC condensing units iced up frequently during the night. This caused a loss of cooling air. In the morning, as the temperature began to rise, the air conditioning was inoperable due to thick ice. As a temporary fix, techs melted the ice away each morning with electric heat guns and gas torches.

The units are a bit old, but your HVAC contractor's test reports show they meet spec and are mechanically sound. Based on this, your plant manager says the only

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