No "C" terminal on furnace controller

[BartWorden]

We have a 2 wire heat only system and the Nest thermostat is not getting sufficient power. We've purchased a Nest Power Connector but the Honeywell L7224 Aquastat does not have a terminal labelled "C". Can the ECOM 1 or 2 terminal be used for the C wire connection?

[Ryan_G]

Hey BartWorden,

Thank you for reaching out and we're sorry for the delay.

For a system that has no common wire slot from the main board, it is recommended to call your HVAC technician to properly connect your Nest Power Connector to your system.

Check out this link for more information on how to install your Nest Power Connector.

I hope it helps.

Regards,

Ryan

[Gmace001]

I have the same aquastat.  Did you ever figure this out?

[papernix]

I am also looking for this answer, we are going through batteries like crazy and having an unreliable experience with the nest.