CBHvac wrote:
Hi all,
I had to run an additional wire to supply 24vac which I ran from the 24vac
t ransformer on the side of the furnace to RH and C. I then ran the original
wires to W1 and C through a 24vac isolation coil. The system seems to be
working well.
Rich
: "Rich" wrote in message
: om...
: I have a new 3-wire programmable thermostat but only two wires coming
: up through the wall. The thermostat calls for wires to Rh, C and W.
: I can pull a new three wire thermostat cable but am not sure how to
: wire it to the oil burner. The system is oil-fired hot water and the
: thermostat that I want to replace is the primary zone with no zone
: valve as far as I can see. I tried hooking up the the red wire to Rh
: terminal and and the white wire to C terminal and got power to the
: thermostat but when the thermostat calls for heat there is none.
:
: Thanks for your help,
: Richard

: First, do you have a 18VAC or 24VAC transformer in the furnace?
: No..not the 10,000VAC burner transformer, but the control transformer...


: IF and ONLY if its a 24VAC, you are still going to need a common....and you
: dont have that on a 2 wire...

: Not being able to see what you have is another issue, but, it sounds like
: you have a common required stat, (hate em) and since all you have is the
: loop for heat..well...it would be wise to have someone that can see your
: situation wire in a new one, but the red wire is NORMALLY 24VAC, and the
: white is NORMALLY your heat call, meaning it goes to the W terminal, and the
: common you dont have, can go to a couple of places, and will go the C
: terminal.



--
Ciao,
Rich

---------------------------------------------------------------------------
Richard Mandel | E-mail address:
Boston Univ. School of Medicine | Phone No. 617-638-4512
Boston, MA 02118 | Fax No. 617-638-4085
-----------------------------------------------------------------------------

Sounds like a lot of extra work. For that ammount of work, you coulda hired
CBH to come out and do it for you.

--

Christopher A. Young
Learn more about Jesus
www.lds.org
www.mormons.org
..
..

"Richard Mandel" wrote in message
...
CBHvac wrote:
Hi all,
I had to run an additional wire to supply 24vac which I ran from the 24vac
t ransformer on the side of the furnace to RH and C. I then ran the
original
wires to W1 and C through a 24vac isolation coil. The system seems to be
working well.
Rich

Yea..he could have, and since he only had 2 wires, he had to..but you knew
that didnt you hackboi?

Got new for ya...if he DID call me, and it was a fairly simple run, he might
have gotten it for free..

Oh..I bet that just kills ya....the fact that many times we do thing for
free...
"Stormin Mormon" wrote in message
...
Sounds like a lot of extra work. For that ammount of work, you coulda
hired
CBH to come out and do it for you.

--

.

"Richard Mandel" wrote in message
...
CBHvac wrote:
Hi all,
I had to run an additional wire to supply 24vac which I ran from the 24vac
t ransformer on the side of the furnace to RH and C. I then ran the
original
wires to W1 and C through a 24vac isolation coil. The system seems to be
working well.
Rich