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York heat pump/auxilliary element heat
Got a York system that had a double mercury switch thermostat (4 mercury vials). Does this indicate a 2 stage system? Customer wanted a set back thermostat. Installed and system working. By putting on emt switch I can get heat pump to cut out and heat only with the electric elements in the air handler. But when things warm up a bit, is it possible to only heat with the heat pump and if so how? BTW, at what temp do you recommend the customer notuse the heat pump part of the system? Thanks, Ken