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I have an 80% efficient furnace with single stage AC - wired

into a honeywell EIM....
I have an 80% efficient furnace with single stage AC - wired into a honeywell EIM. The thermostat is flaky (> 15yrs) and I want to replace. Prefer to remove EIM to give more options on thermostat. Question: Anything special to consider removing EIM as long as thermostat wire has enough unused cables?
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: Thermostat. The furnace/ac work great when using a spare model (Honeywell Prestige IAQ)
JA: Do you plan on doing the work yourself?
Customer: Would prefer. Electrical work I'm fine with, running new wire if needed, moving thermo etc. Depends if there is anything that needs to change on Furnace side or just run the wires straight to thermo
JA: Anything else we should know to help you best?
Customer: Not that I can think of.
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Answered in 8 minutes by:
12/15/2016
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 22,631
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.

Based on your description you can use any heat/cool thermostat. The furnace terminals that are now connected to the EIM would connect directly to the new thermostat. There's nothing usual about the switch. Nothing to change on the furnace

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Customer reply replied 1 year ago
Thanks.
Customer reply replied 1 year ago
I know that the AC requires the furnace to always use the fan at high speed. Is it correct that such a feature is just based on which wire terminals are being used?

The AC fan speed is an internal furnace control function independent of the thermostat wiring. As long as you connect the thermostat to the same corresponding terminals on the furnace termianl strip you'll be fine.

Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 22,631
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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