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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Taco 506 relay question using a nest Thermostat.

Customer Question

Hi I have a Taco 506 relay question using a nest Thermostat. Can this be accomplished with a two wire system?
JA: Thanks. Can you give me any more details about your issue?
Customer: No issue just researching to see if the nest will work with my system. its a 4 zone Buderus Boiler using a Taco 506 6 zone relay. All thermostats are currently only two wires but a third wire is present just not connected.
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Submitted: 10 months ago.
Category: HVAC
Expert:  Rick replied 10 months ago.

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.

Not likely, the Nest steals power from the R wire and the SR506 is an isolation relay so there's usually no voltage across R & W.

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