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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I just purchased a home, and want to update the older

Customer Question

I just purchased a home, and want to update the older mercury thermostat, hopefully to a NEst or something like that
JA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.
Customer: But I'm having difficulty determining my current wiring
JA: Is there anything else the HVAC Technician should be aware of?
Customer: Not to my knoweldge, although I'm sure he will have more Q for me.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Customer: The fan continues to run on the Hvac even when the heat light is not on, it seems to never shut off.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

I am happy to assist

Expert:  airheatman replied 1 year ago.

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

Expert:  airheatman replied 1 year ago.

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

Customer: replied 1 year ago.
Thanks! I have an older GE HVAC system, but I am having trouble determining the wires since there is no visible terminal. I have attached some photos, please let me know if you cant see them.Also: the fan has been on auto.
Expert:  airheatman replied 1 year 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

Expert:  airheatman replied 1 year ago.

Look for wires connected similar to this and let me know what you find

Expert:  airheatman replied 1 year ago.

I only got the one photo showing mercury bulbs