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I just purchased a home, and want to update the older

Customer Question
I just purchased a...

I just purchased a home, and want to update the older mercury thermostat, hopefully to a NEst or something like that

Contractor's Assistant: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.

But I'm having difficulty determining my current wiring

Contractor's Assistant: Is there anything else the HVAC Technician should be aware of?

Not to my knoweldge, although I'm sure he will have more Q for me.

Submitted: 2 years ago.Category: HVAC
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Answered in 1 minute by:
2/17/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,366
Experience: Furnace, A/C and heat pump specialist.
Verified

I am happy to assist

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

What type of system do you have and do you know what wires currently connect to what terminals on existing thermostat?

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Also let me know if you turn thermostat to SYSTEM OFF and make sure Fan is in AUTO (NOT ON) mode?

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

1. Wires should be connected to sub base. possibly on back side

2.Fan staying on is most likely a relay or sequencer issue,not thermostat

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I only got the one photo showing mercury bulbs

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