EWC-ST-2E to NCM-300 for NEST

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jtsi2001
Posts: 1
Joined: Tue Nov 19, 2019 5:05 pm

EWC-ST-2E to NCM-300 for NEST

Post by jtsi2001 » Tue Nov 19, 2019 5:54 pm

I have read several topics on this forum since the purchase of a NEST thermostat and realizing my current control board is not going to work. I like others am no HVAC expert but comfortable with DIY wiring. Looking at the manual to make the swap it all looks good with the exception of a few areas where my wiring is different. I have attached pictures of the overall wiring of my system and when zoomed in you will see that the Yellow and Brown wires are together on the main boards system "Y". also the zone motors on my system are using the M1,M2,M4 vs M1,M2,M6 in the diagram, my zone wiring is abit different as well but I'm assuming this may be to the master/slave setup. lastly there is a white and blue wire which I'm not certain where the originate from tied together

I will be purchasing the new board soon and hoping I can get some assistance with the wiring
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Steven W.
Posts: 11
Joined: Tue Jun 25, 2019 9:13 am

Re: EWC-ST-2E to NCM-300 for NEST

Post by Steven W. » Mon Nov 25, 2019 12:34 pm

Good morning;

My name is Steve i am one of the Tech's here at EWC Controls.

When you get a chance can you give me a call.

Thank You

Steven R. Weisneck
Technical Engineer
Tel: (732) 446-3110 Ext. #461
Fax: (732) 446-5362 or (732) 446-4946
www.ewccontrols.com
sweisneck@ewccontrols.com
Steven R. Weisneck
Technical Engineer
Tel: (732) 446-3110 Ext. #461
www.ewccontrols.com
sweisneck@ewccontrols.com

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