White_Rodgers 1F58W-72 to HoneywellRTH7400 - http://www.hvacmechanic.com/ Forums

Original message

drjerryk

67.191.174.88

"White_Rodgers 1F58W-72 to HoneywellRTH7400" , posted Sun 27 Jan 19:55

I'm replacing my White-Rodgers thermostat (model 1F58W-72) with a Honeywell Vision RTH7400D. The original had a wire to X1 terminal and the honeywell manual provides no instructions on where this one should be connected on the RTH700D. The original answer was to connect the X1 to C on the honeywell but I also have an O and a B and according to the Honeywell instructions the O shoud go to the O/B abd the B should go to the C. Should I also put the X1 on C?

drjerryk

Replies:

Houston204

98.196.66.53

"Re(1):White_Rodgers 1F58W-72 to HoneywellRTH7" , posted Sun 27 Jan 23:19

X1 = common

It is uncommon for heat pumps to use both O and B for the reversing valve. Most brands use O. What brand is your outdoor unit?

Some entry level motorized zone systems are the exception.

"Tip of the Day" Remember to remove power first.