EWC Controls Forum

Is the Emergency Heat/ Normal switch, available on a terminal block? I want to provide a convent switch for the customer to access. (not in the attic) The system is using a UZC4 setup with a two stage Heat Pump condenser ,dual fuel two stage emergency heat(Gas) and Digital thermostats (2 Cool,4 Heat...

Thanks for the answers. I need the OAS to shut down the heat pump and turn on the emergency backup heat when it is cold outside. I did not realize that the timer could not be defeated on this mode, even with the pot turned to the off position.

I have a an OAS, SAS, & RAS connected and have turned the pot to off, the second stage (Heat & Cool) still turns on. (See switch settings above) I have been pressing the timer reset switch to speed up any pending timer functions instead of waiting for it to time out. I have not waited the 20...

I am testing a UZC-4, (with two t-stats and two zone dampers - 2 stage compressor HP, SAS & RAS connected) on my work bench and have noticed the following actions. When both t-stats are calling for 1st stage heat or cooling, the UZC will issue the normal single stage startup, then after a period...