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Posted by bud-- on July 21, 2007, 1:31 am
snakedjip@yahoo.com wrote:
> Hi,
>
> I currently have a Robertshaw 300-208 thermostat running my Luxaire
> heat-pump and (some other brand) electric furnace as auxiliary heat.
>
>
> I just bought the Honeywell RTH8500 thermostat to replace it.
>
>
> There are two labels on the Robertshaw thermostat which do not
> correspond to any label referred by the installation manual for the
> Honeywell thermostat : "24V" and "24V(c)".
>
>
> I've included pictures of the current wiring. Because some of the
> labels are hidden in the pictures, here's a top-to-bottom list:
>
>
> W1
> Y1
> G
> R
> 24V
> 24V(c)
> O
> B
>
>
> Here are the pictures:
>
>
> http://www.jpti.ca/IMG_6107_2.JPG
> http://www.jpti.ca/IMG_6102_2.JPG
> http://www.jpti.ca/IMG_6103_2.JPG
> http://www.jpti.ca/IMG_6105_2.JPG
>
Pictures! What a radical idea.
>
> Can anyone tell me which of my wires I should connect to which
> terminal on the Honeywell ?
>
Robertshaw
24V is power to the control circuit
24(c) is the 24V common (like a neutral in a power circuit)
R is 24V power to the switches in the stat - jumpered to 24V
W1 connects to R for heat - 1st stage - heat pump
Y1 connects to R for cooling - 1st stage
G connects to R for fan
O ??likely 2nd stage heat - electric heat
You don't give the terminals for the Honeywell but R-W-Y-G are standard.
You may need 24V common to power the Honeywell control circuit - that is
the blue wire. Orange is probably the Honeywell second stage heat.
As the temperature falls to the set-point for heat, R-W1 connect to run
the heat pump. Maybe 2 degrees cooler R-O[probably] connect for electric
heat.
(I didn't google either Robertshaw or Honeywell. With heat pump and aux
heat the Honeywell very probably needs to include 2 stage heat.)
--
bud--
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