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gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5216
Experience:  51 years of experience install design and repair of all makes and models of AC
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can you use a Honeywell TH6220D programmable thermostat on

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can you use a Honeywell TH6220D programmable thermostat on an EWC-ST-2D HVAC - not heat pump


If yes - I need a wiring diagram to show where the B and O wires are connected.  6 wires available.

Russ here.. If you do not have a heat pump. B and O do not connect. Russ
Customer: replied 3 years ago.

They were connected and are referenced on our wiring diagram at the furnace. We won't have 2 zones if they are not connected.


Let me check my EWC manual
With that EWC board you must have a thermostat with separate O and B terminals to work. Russ
Customer: replied 3 years ago.

OK - good to know. The local HVAC guy recommended this thermostat, so I guess he was wrong. We cannot get it to work. Will try to exchange it with the electrical supply company.




You are welcome. The B terminal signals heat. The O terminal signals cool on the panel. Russ
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