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-   -   Thermostat wiring question (http://www.diychatroom.com/f17/thermostat-wiring-question-44071/)

beer_geek 05-08-2009 09:21 AM

Thermostat wiring question
 
My HVAC installer is no longer available (long story)

Anyway, I had him rough in a dampered system for the basement that's tied into the first floor Rheem Criterion unit. This way, I'd only have that area serviced when needed. He installed a Honeywell HZ-311 zone controller. He handed me a White-Rodgers 1F78H-144 thermostat to be installed after the drywall went up.

Here's my issue. There are 5 wires attached to the Honeywell(R, C, W, Y, G). The thermostat has W, RH, B, RC, G, O, and Y connectors with RH and RC jumpered.

I'm trying to figure out the wiring. Most of the connections are obvious. I'm wondering about the (C) wire and the jumper wire. Do I connect the (C) to (RC) and remove the jumper or do I not connect it and leave the jumper in place?

The Honeywell manual says to wire per the thermostat instructions.

http://customer.honeywell.com/techli...69-2069EFS.pdf

http://www.white-rodgers.com/wrdhom/.../0037-6615.pdf

Any assistance will be greatly appreciated.

biggles 05-09-2009 05:47 AM

WR figure #4 the Honeywell called for a direct 24Vs to power the stat R-C,on the WR the C(other side of the TR) is G,Y,W when called for don't need dedicated 24v to run that WR stat.on that jumper always leave it in Rc-Rh for single TR systems.removing it.....if you had oil heat TR on the burner,or 2nd TR out in the condenser for the cooling side.your single TR in the furnace needs the jumper so the 24Vs is flipped over to the cooling or heating side during the seasons....stat can't do AUTO system setting without it.hope this helps i am saying this with the mind set your using the WR replacing the Honeywell to run the HVAC system and control the dampers!:huh:

beer_geek 05-09-2009 04:47 PM

So, in other words, the C on the Honeywell does not need to be connected to the WR Thermostat. Is that correct?

biggles 05-09-2009 08:19 PM

the #4 schematic doesn't show any C which is the common side of the TR are you replacing the Honeywell with the WR?

beenthere 05-09-2009 09:39 PM

He's installing a thermostat for that zone.
Its a new zone system. So it never had a thermostat before.

Thats what I take from his original post.

beer_geek 05-10-2009 09:00 AM

Beenthere,
Exactly. As stated, a damper system was installed to service the first floor and basement by the Rheem. The Honeywell is the controlling mechanism that the thermostats connect to. I'm trying to hook up the aforementioned thermostat to the honeywell to control the basement zone.

beenthere 05-10-2009 09:11 AM

Zone Panel------WR Thermostat
---R---------------RC (leave factory jumper to RH)
---W--------------W
---Y---------------Y
---G---------------G

Disconnect the wire from the C terminal at the zone panel and wirenut it off to prevent short circuiting.

That thermostat is battery operated and does not require a Common to work.

beer_geek 05-10-2009 06:49 PM

Thanks for the verification.


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