from Janitrol to Honeywell wiring thermostat?

Posted by on August 13, 2006, 3:06 am

Hi,

I just bought a new digital Honeywell thermostat - TH8320. I am
replacing an old mercury one - the writing in the back is Janitrol
HPT18-60, 3AAT86B21A1 HOUSTON, TEXAS. LR 11746, 30 V.A.C.1.5.A, CLASS
2, 9629.

I'm not sure how to wire the new one, looking only at how the old one
was wired. Seems like W2 is for heat relay 2, but on the old one there
is no W1 for heat relay 1... I don't know what kind my system is
(2h/2c, 2h/1c etc) i was hoping to figure this out from the wiring...

The wiring on the old one:
W2 - white
E - blue
C - black
Y - yellow
G - gren
R - red
O - orange

There is also a brown wire comming out of the wall that was not used.

Any sugestions on how I need to wire my new one?

Posted by Dan Luke on August 13, 2006, 8:09 am

> The wiring on the old one:
> W2 - white
> E - blue
> C - black
> Y - yellow
> G - gren
> R - red
> O - orange
> There is also a brown wire comming out of the wall that was not used.
> Any sugestions on how I need to wire my new one?

http://customer.honeywell.com/Techlit/pdf/68-0000s/68-0280.pdf

Fig. 20.

Posted by Noon-Air on August 13, 2006, 8:28 am

> Hi,
> I just bought a new digital Honeywell thermostat - TH8320. I am
> replacing an old mercury one - the writing in the back is Janitrol
> HPT18-60, 3AAT86B21A1 HOUSTON, TEXAS. LR 11746, 30 V.A.C.1.5.A, CLASS
> 2, 9629.
> I'm not sure how to wire the new one, looking only at how the old one
> was wired. Seems like W2 is for heat relay 2, but on the old one there
> is no W1 for heat relay 1... I don't know what kind my system is
> (2h/2c, 2h/1c etc) i was hoping to figure this out from the wiring...
> The wiring on the old one:
> W2 - white
> E - blue
> C - black
> Y - yellow
> G - gren
> R - red
> O - orange
> There is also a brown wire comming out of the wall that was not used.
> Any sugestions on how I need to wire my new one?

Chase the wires down and draw a wiring diagram.

Posted by Moe Jones on August 13, 2006, 10:05 am

First before you do any damage to your system, call out a HVAC tech. You
will pay about an hour labor to install and in the long run it will save you
money.

I have a question, where did you buy the stat? And what did you pay?

Here in the Houston area you can go the Home Depot and buy a stat but I have
been told that if you bring back the stat, it has to be inspected by
Honeywell before you can get credit for it.

--
Moe Jones
HVAC Service Technician
Energy Equalizers Inc.
Houston, Texas

Posted by on August 14, 2006, 2:37 am

I had posted the same question and got a responce on another web site.
Here is his answer:

Follow the diagram in figure 15 - single stage heat pump with
auxilliary heat -
Using the heat pump terminal designations -

Old New
W2 - white - Aux
E - blue - E
C - black - C
Y - yellow - Y
G - gren - G
R - red - R & Rc
O - orange - O

Make sure you set the thermostat for heat pump in the installer setup.

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