EWC Controls Forum

Hi,
I have an EWC-ST-2C with two zones. The thermostats are original to the house and are old, non-programmable, and contain mercury. The master thermostat (zone 1 first floor) is from White Rodgers, model type 1F56W-444. The slave thermostat (zone 2 second floor) is an Ultra-Zone from EWC, type 1F35-613.
What are my options for new thermostats (for zone 1 and zone 2), preferably programmable? I tried a couple of Honeywells (RTH2300 and CT31A) with no sucess.
Thanks, I'd appreciate any help.

Stefan Dalan
Grafton, MA

Here is a list of programmable thermostats that EWC Controls has confirmed to work properly with the ST Series of Control panels.

EWC Controls Model EWT-3707
White-Rodgers Model 1F80-361
Robertshaw Model 9610
Honeywell Model TH4110D1007

Eric

I had the same zone controller and wasn't satisfied with available options for thermostats. I specifically wanted to install Venstar thermostats in all zones. I purchased the NCM300 and installed this past weekend. It turned out great - quality controller and has status lights so you can see exactly what it thinks it should be doing.

I like options! And no issues with the seond zone? Same thermostat for both zones?

I was able to use Venstar 1800 in all zones. The only thing I had to be concerned with was having enough wires in the secondary zones. I had only 3 wires available and had to use the Venstar add-a-wire kit to have 4. I used one for R, C, W, Y and tied together W & G on the controller so the fan turns on with heat for the secondary zones. I had enough wires to have G independent in the main zone.

When using the NCM-300 the 4th wire 'G' is not necessary unless you want fan only operation from that thermostat.

I live in SE Texas and have an EWC-ST-2D with two zones (gas heating and A/C). I am like stefandalan with both thermostats being old mercury bulb Ultra-Zone type 1F35-613. I assume the Honeywell Model TH4110D1007 would be compatible for my zone 1 thermostat as well? If so, which wiring diagram would I use? Offerings in the manual are:

1. Typical 1H/1C system: 1 transformer
2. Typical 1H/1C system: 2 transformers
3. Typical 1H/1C heat pump system--this one seems to match the closest, but I don't have a heat pump

Any other settings to consider during set up? Thanks.

The wiring configuration you are going to use will not follow any of the ones depicted in the Honeywell manual.

With that thermostat I would follow figure #10 on the diagram from the link below.

http://ewccontrols.com/acrobat/090375a0115.pdf

_________________
Patrick Cyrana
Pcyrana@ewccontrols.com
1-800-446-3110

I am looking to purchase the Honeywell TH4110D1007 for my zone 1 thermostat, but which thermostat would be appropriate for zone 2?

The Honeywell TH4110 thermostat will be appropriate for Zone 2 as well.

Other than that, any standard conventional Heat/Cool thermostat will work on Zone 2.

_________________
Patrick Cyrana
Pcyrana@ewccontrols.com
1-800-446-3110