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I have a rodgers 1311 zone valve connected to an old mercury…

Customer Question
I have a white rodgers...
I have a white rodgers 1311 zone valve connected to an old mercury thermostat. Trying to connect to an Emerson 1F85U-42PR programmable thermostat. 2 things.
1. When I discoonect the old thermo the heat statrts.
2. When I connect the new thermo the heat does not turn off. I am connecting Red to RH, Green to O/B and white to W. Any suggestions?
Submitted: 2 months ago.Category: HVAC
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Answered in 4 minutes by:
12/17/2017
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 23,376
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

Go to the zone valve and tell me which color leads are connected to terminals 4,5 & 6 on the zone valve

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Customer reply replied 2 months ago
I am looking at a wiring diagram. Looks like 4 -G, 5-W and 6-R
Customer reply replied 2 months ago
Still there??
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

Yes, just got notice of your response.

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Customer reply replied 2 months ago
No problem. Just wanted to make sure we did not get disconnected.
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

4 to W, 5 to RH, 6 to O/B

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Customer reply replied 2 months ago
re-wired and the heat came on with thermo set below room temp
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

Double check your connections. That's how its wired. Small temp diff between thermostat and room temp can call in the zone valve.

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Customer reply replied 2 months ago
There were some installer settings that were confusing. Maybe those are part of the issue. There is one where I have to chose between O,B or 3. I have tried O and 3. Currently set to O. This is setting 20.
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

I don't have the manual handy. Refer to your manual for a 3 wire zone vale config

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Customer reply replied 2 months ago
There is not a specific settings definition for a 3 wire zone valve.
Customer reply replied 2 months ago
Can I send you a picture of the wiring on the valve. Maybe I am interpreting that incorrectly.
Customer reply replied 2 months ago
I attached the thermo installer instructions.
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

Sorry should be on 3

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HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

Should be on 3

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Customer reply replied 2 months ago
Had it on 3 and it wasn't working. What about settings 05 and 10. I did not know how to set these for a boiler system.
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

Try AC0 for 05, any one of the first 3 on 10 are likely to work

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Customer reply replied 2 months ago
I had the settings set per your suggestion.
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

Can't make it out. You're in a better position than I am to determine the connections. Only other (odd) possibility is a different color splice in the wiring. I assume you have the thermostat set to heat

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Customer reply replied 2 months ago
It is hot in here right now from my other testing so I have it set lower expecting the heat to not come on when I re-attach it but the heat comes back on.
HVAC Technician: Rick, HVAC Supervisor replied 2 months ago

There's on much more I can tell you. I have my doubts about the wiring being same color throughout.

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Customer reply replied 2 months ago
ok
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