Original message
| VinnyT
 |  "Need T-stat wiring help - old Lennox"
, posted Mon 25 Aug 09:43  
The unit is an old E12 Electric Furnance.
Okay, have an OLD Lennox electric furnace-A/C. Trying to replace the original T-stat with Honeywell RTH7400. Now here is the old wiring:
Orange - X
Green - F
Yellow - Y
Brown - VR
Black - R
Blue - V
White - E
Red - M
Then a seperate two-wire bundle:
Red - A
White - L
The Honeywell has:
RC
R
O/B
Y
G
C
L
E
Aux
It says if V and VR have seperate wires, contact a contractor.
GRRRR!
Can anyone help, or am I a slave to the HVAC tech?
Thanks.
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Replies:
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| yuri
| "Re(1):Need T-stat wiring help - old Lennox" , posted Mon 25 Aug 09:58
Seriously, you may want to look at getting a new electric furnace. Lennox does not make them anymore and the elements are obsolete. Yours I believe is designed to work with a heat pump with multiple stages of backup electric heat. Wickedly complicated. Like I said it is probably obsolete. They do make coil blower units with electric elements but not furnaces. I sell the Nortron units and the new ones with ECM motor are very good.
Yuri
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| | VinnyT
| "Re(2):Need T-stat wiring help - old Lennox" , posted Mon 25 Aug 10:02
Thanks.
I would love to, but the landlord won't replace it. I am in an apartment. I bought the new T-stat and probably have to pay for installation also. So, hopefully I can get someone to give me the cross-reference to do this myself.
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| | yuri
| "Re(3):Need T-stat wiring help - old Lennox" , posted Mon 25 Aug 10:04
Be very careful. If you mess it up they will blame you and charge you the repair $$. If it ain't broke, leave it alone.
Yuri
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