Thermostat Options for EWC-ST Series Control Panels

[stefandalan]

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

[Eric K.]

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

[nlagaros]

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.

[stefandalan]

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

[nlagaros]

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.

[Eric K.]

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

[winkyonthewater]

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.

[Pcyrana]

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

[bcatenzaro]

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

[Pcyrana]

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.