Heat Pump Thermostat Wiring Chart Diagram Quality 101 Heat Pump Thermostat Wiring Chart Diagram - The Basic heat pump wiring for a heat pump thermostat is illustrated above. It corresponds Is it comparable to a Honeywell RTH3100C Heat Pump. Reply. Mark on December 6, 2016 at 3:03 pm Paid a friend to replace my 2 air handler and heat pumps. These were the same units, one upstairs and one Thermostat Terminal Designations HVAC Wiring Quality 101 F irst we start off with the thermostat terminal board itself. This is hidden away behind the actual thermostat and on a small plate referred to as the sub-base of the thermostat. It has little letters on it that differ from thermostat to thermostat but the most common designations are: R or RH and RC, G, Y, W, and C. For heat pumps there are typically O and B terminals also.
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