I recently bought an older home, picked up a Hunter Digital Thermostat in order to change out the old one. Ok, I'll bite the bullet-----I forgot to label the colors on the thermostat wires prior to removing them, thinking they corresponded to the color coding on the thermostat. Now it is 80 degrees in here and won't shut down?
Does anyone have any helpful suggestions as to how to track down the correct wiring/color coding diagram.
It is a 3 wire, red, white and green set up. It is a gas hydronic heating unit. Have been struggling with this for hours now.
I'd appreciate any and all suggestions.

First check and post the brand and exact model number of the zone valve or boiler control. Many of these controls are of the 3 wire variety and need special thermostats.

MOST important also. Post the brand and Exact model number of your old thermostat. This can give us a clue also into the type of actual control setup you have.

Thank you for the speedy response.
The Flow Valve is a white-Rogers Zone A flow water valve---type F19-0097.
The old thermostat is a White Rogers type 1F35-910.

Valve

Description of Item:3 Wire Hydronic Zone Valve For 3/4" I.D. Tubing, 15 PSI Maximum Differential Across Valve, 240°F Maximum Water Temperature, 24 VAC, 60Hz, 50 PSI Maximum System Pressure,
Descriptive Comments or For Whom Made:Dayton No. 2E163A. F19-0097 motor assembly or F84-0433 valve assembly may be replaced independently.


You have this valve with W/R number it is 3 wire and does need a compatible thermostat.

http://www.white-rodgers.com/wrdhom/.../0037-5421.pdf


Here is your old thermostat

http://www.white-rodgers.com/wrdhom/.../0037-1215.pdf

Here are the W/R thermostats that will work/upgrade to. There are other brands that will work with 3 wire but tuff to find.

http://www.white-rodgers.com/wrdhom/.../0037-6814.pdf

http://www.white-rodgers.com/wrdhom/...6_pg0008_9.pdf

Ok, that's good news, I can find one of those, but, how do I re-install my old thermostat when I have mixed up the wires? I forgot to label them prior to removing them, and when trying to replace them, ended up with the furnace running continuously. How do I track down the proper wiring sequence?
I really do appreciate you trying to help me, just not sure what to do at this point.

Crap I was wondering if you were going to ask that one. LOL

I posted above a wiring diagram for a white rodgers thermostat. Use that diagram along with the valve diagram and compare the wire colors on the valve number to the thermostat number. Take a piece of paper with you to the valve location and write it down. PS do not forget a pencil/pen. LOL

Hi and thanks again! I've tried making heads/tails from the diagram you included, not working for me. I've copied the numbers from the zone valve along with their corresponding wire colors, perhaps that would be helpful?
I'm pretty upset with myself right now, knew better, about 20 years ago, but time has a way of dimming good sense, I'm afraid!

LOL We are all afraid at this time in the USA and not just of heating equipment. Let me look at the diagrams.

Thanks for the touch of humor, it is really needed right now! I soooooo appreciate you sticking with me through this! Feeling a little better since you didn't throw your hands up in the air and give up on me!

It is an easy one.

Go to the valve and take a magnifying glass with you. The numbers are small and I am old and have a hard time reading them. LOL

Look for the number 6 connection or landing area and write down that color for the number 6 terminal.
Then go to the number 5 and do the same
Then go to number 4 and do the same.

Now you have the numbers with the corrosponding color wires that are attached to them.

Go to the thermostat and attach the color wire that corrosponds to the number on the valve to that same number on the thermostat.

Example

4 to 4
5 to 5
6 to 6

Now that was not to bad now was it.

If all else fails see picture.LOL

Fingers crossed, I think its working again!!
Thank you so very much. Is there anything I can do to repay you for this? You saved me a ton, I'm sure! And, now that I'm aware of how the wiring set up, I guess I'm feeling brave enough to invest in a different digital model and hook it up, with the wire colors marked prior to removing, of course! LOL
Thanks again,
Sandy

I help out for free but if you feel like making a small donation to your favorite charity or food bank that would be great. A small note posted to my reputation would also be nice. Click on the scale upper right. Make sure you get only a thermostat that will work with 3 wires White Rodger products.

Quote:

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Originally Posted by hvac1000

I help out for free but if you feel like making a small donation to your favorite charity or food bank that would be great.

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You declined their offer too quickly! Now we'll never know just what they were willing to do... :D

No greed here I have plenty of $$$ from posting my flame sensor picture.

I'm going to cash in on that angle with a pic of a model/serial tag.:p

Good idea