axialcompressor
Feb 22, 2008, 06:49 PM
I'm replacing a 24 year old Bryant heat pump thermostat with two mercury switches, part number P271-3457 with a Honeywell RTH7400. It controls a heat pump/air conditioner with electric thermal storage (equivalent to electric resistance backup) as second stage heating. The Honeywell manual and website do not cover my situation, as all 8 thermostat wires are connected to the thermostat and there are no jumpers:
Wire Color - Old Thermostat Terminal
Red - R
Org - O
Yel - Y
Grn - G
Brn - C
Blu - E
Wht - W1
Blk - W2
The Honeywell guidance only covers a maximum 7 wires and provides for either W1 or W2 connecting to the AUX terminal, but not these wires going to separate terminals.
Any advice for a frustrated electrical engineer?
Wire Color - Old Thermostat Terminal
Red - R
Org - O
Yel - Y
Grn - G
Brn - C
Blu - E
Wht - W1
Blk - W2
The Honeywell guidance only covers a maximum 7 wires and provides for either W1 or W2 connecting to the AUX terminal, but not these wires going to separate terminals.
Any advice for a frustrated electrical engineer?