Original message
| fazzy
 |  "wiring help with Honeywell TH4210D thermostat"
, posted Mon 12 May 17:31  
I'm replacing a 24 year old Bryant heat pump thermostat with two mercury switches, part number P271-3456 with a Honeywell TH4210D. 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 TH4210D has the following wiring positions for heat pumps:
C
B
R
L
O
G
Y
AUX
E
Can any one advis which wire needs to connect to the new thermostat
Thanks
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Replies:
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| theduke03
| "Re(1):wiring help with Honeywell TH4210D ther" , posted Mon 12 May 19:20
I am curious about what W1 and W2 control.
Do you have elec. resistance heat also?
Is the ets 2 stage?
If you don't know then answer this: Do you ever feel cold air blowing from vents when heat pump goes into defrost?
You may need a 3 stage thermostat.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | Houston204
| "Re(2):wiring help with Honeywell TH4210D ther" , posted Mon 12 May 20:35
New terminal = wire(s)
C = brown
B = not used
R = red
L = not used
O = orange
G = green
Y = yellow
Aux = black and white
E = blue
Note that Carrier uses brown for common instead of the blue used in my example...
"Tip of the Day" Remember to remove power first.
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