Honeywell t822d 1255 replacement wiring

Problems related to residential installations.

Honeywell t822d 1255 replacement wiring

Postby Dee0011 » Fri Nov 11, 2011 9:45 pm

Hello i have three zone heating to an oil burning boiler only the middle zone thermostat will fire up the system, i was thinlking my thermostat was bad so i purchase a new thermostat to replace my bottom zone thermostat it a honeywell T822D 1255 only two wires are attach to this termostat a red and white but the thermostat does not have r or rh marked on the back so i dont know which is which ..... Any help would be appricated
Dee0011
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