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Old 10-06-2010, 06:13 PM   #1
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Honeywell Q674L to RTH7600D upgrade


I have a heat pump with a Honeywell Q674L 1207 thermostat on it. The wiring on the current thermostat is

O, G, R, Y, a white wire to W2 which is jumpered to E and a brown wire to X.

What is the right configuration to replace the thermostat with the newer Honeywell RTH7600D? Thanks

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Old 10-06-2010, 06:23 PM   #2
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Honeywell Q674L to RTH7600D upgrade


O = O/B
G = G
R = Rc & R
Y = Y
W2 & E = Aux & E
X = C
option 170 = 7
option 190 = 0

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Old 10-06-2010, 06:53 PM   #3
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Honeywell Q674L to RTH7600D upgrade


Quote:
Originally Posted by Houston204 View Post
O = O/B
G = G
R = Rc & R
Y = Y
W2 & E = Aux & E
X = C
option 170 = 7
option 190 = 0
Thanks a lot. What I tried was
G = G
R = Rc & R
Y = Y
W2 & E = Aux
X = E
option 170 = 7
option 190 = 0

and it blew up the 5 amp fuse in the coil furnace . I am glad that was the only damage. Thanks a lot again.
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