EWC Controls Forum

You just need to hook up the "C" Common wire to the NCM 300 and the Nest thermostat and you will be good.

If you are looking for a Thermostat for the master zone on your ST-2E / ST-3E zone boards here is a list of Thermostats that have the separate "O" and "B" connections that you are going to need for the master zone. Remember the ST series boards are master/slave (Winter/Summer man...

Can you give me a call when you got some free time to talk about this I have some questions. Thank you

Steven R. Weisneck
HVAC Zoning Technician
Tel: (732) 446-3110 Ext. #461
www.ewccontrols.com
sweisneck@ewccontrols.com
M-F 8:00am - 4:30pm

If you are swapping out the ST-2E for the NCM-300 then you will not need the O or B terminals they are now spare wires.

Make sure your zone dampers are going to the correct Zone. When you get a chance give me a call again. I will be in the office all day today.

732-446-3110 x461

Steven

PRO 1 Thermostats
T601-2 – None Programmable
T725 - Programmable-This one is your best bet
T855 - Programmable
T855i – WiFi Thermostat
T955WH – Wireless Thermostat

Yes Bmplus will be fine

please give us a call
732-446-3110

Yes sir ewc equipment will work for you. I would go with a Bmplus 3000

You need to replace your Zone board. Sounds like your relay is going.