EWC -ST-2D Zone 2 wiring

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angelop123
Posts: 1
Joined: Mon Dec 31, 2018 4:24 pm

EWC -ST-2D Zone 2 wiring

Post by angelop123 » Mon Dec 31, 2018 4:36 pm

My zone 1 thermostat has W Y RH/RC O B G C wiring
My Zone 2 has W Y R, no C (working fine with a battery operated thermostat)

If I add a C wire to my zone 2, I can use thermostats such as Ecobee.
My question: will it work even though it has no O or B wire? I will leave my zone 1 thermostat installed as is. I assume the zone one thermostat will take care of whatever the O and B are used for as it's doing now.

My controller is EWC-ST-2D

Paul Z.
Posts: 212
Joined: Thu Dec 08, 2011 3:05 pm

Re: EWC -ST-2D Zone 2 wiring

Post by Paul Z. » Wed Jan 02, 2019 7:47 am

Call 18004463110X490 and I will explain.

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