Thermostat Options for EWC-ST Series Control Panels

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txyannd
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Joined: Thu Nov 29, 2012 11:20 am

Re: Thermostat Options for EWC-ST Series Control Panels

Post by txyannd » Thu Nov 29, 2012 11:25 am

Hi, I have EWC-ST-2D and a conventional gas forced hot air system with A/C, no heat pump. I am trying to install TH4110 thermostat, and I was wondering if anyone know what is the correct system type I need to set on TH4110. I think it's 0, Gas, oil, or electric heat with air conditioning, but I've noticed that the wiring for EWC-ST-2D used the O, B wires which the heat pump system used.

Pcyrana

Re: Thermostat Options for EWC-ST Series Control Panels

Post by Pcyrana » Fri Nov 30, 2012 8:20 am

You are correct. The system type will be set to 0 for gas. You will still connect to the O and B terminals as shown in the technical bulletin.
The ST panel uses the default logic of the O and B relay to control Heating and Cooling in zone two.

wjam
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Joined: Sat Dec 01, 2012 12:23 pm

Re: Thermostat Options for EWC-ST Series Control Panels

Post by wjam » Sat Dec 01, 2012 12:41 pm

mrinheart wrote:Are there any newer programmable Thermostats certified for the ST-2C zone controller? I see the list of Thermostats that was given dates back from 2010. I would like a more modern looking Thermo with the programmable features.

I have a EWC-ST-2D panel with conventional gas forced hot air system with AC, no heat pump. I'm using 5-2 programmable Honeywell RTHL2310B1008 which has separate O and B terminals (available from Lowes for $24.98) as the Zone 1 t-stat and an old round mercury t-stat for zone 2. Seems to work fine for heating and cooling. Either t-stat kicks on and turns off the heat or AC and duct motors direct flow to zone 1 or 2 accordingly. Will probably also swap out the mercury t-stat for a second RTHL2310B1008 for zone 2.

BAB
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Joined: Fri Dec 28, 2012 5:40 pm

Re: Thermostat Options for EWC-ST Series Control Panels

Post by BAB » Fri Dec 28, 2012 5:58 pm

I have the EWC-ST-2C controller and just took out the old mercury t-stat. I was planning on installing the Filtrete/3M 3M-30 but not quite as simple as I thought. My new t-stat has separate O and B terminals. However, reading through the tech bulletin for the ST-2E it appears as if the separate Rh and Rc terminals would be more appropriate for these connections, no? If I did that, then I would have nowhere to put the current "R" wire.

I have a gas furnace and running a 6 lead wire (B,O,Y,W,R,G) and the 3M-30 has terminals for C, B, O, W, W2, Y, Y2, Rh, Rc, G, A.

Any help you can provide would be greatly appreciated.

Pcyrana

Re: Thermostat Options for EWC-ST Series Control Panels

Post by Pcyrana » Wed Jan 02, 2013 9:21 am

You do not need to use the RC and RH to connect to the O and B terminals.
What you are probably looking at is a diagram that shows a thermostat that uses RC/O and RH/B terminals.
For your thermostat you will connect O to to, B to B and R to either the RC or the RH.
If you have any more questions please let me know.

rtheriault
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Joined: Wed Jan 09, 2013 11:45 am

Re: Thermostat Options for EWC-ST Series Control Panels

Post by rtheriault » Wed Jan 09, 2013 2:14 pm

I have a EWC-ST-2E controller with two zones, and a conventional gas furnace. I am running into the problem of finding modern t-stats for my zones that support B and O connections.

After reading posts from forums on other websites, there was a suggestion to ignore the B and O connections and just use the G, W, Y, R wires. The thought behind that suggestion is the t-stat would be able to control whether or not to use heat or cool. The t-stat I'm looking to purchase has both a manual switch as well as an auto sensor to control heat vs cool.

After reading through this forum topic, it is very clear that I need to either purchase MCS-DXB or find a t-stat that can support both B and O connections. Can someone please explain to me why I wouldn't be able to use the features of my t-stat to control heat and cool? Do the B and O connections provide additional functionality that I'm not aware of?

Thanks,

Rich

Pcyrana

Re: Thermostat Options for EWC-ST Series Control Panels

Post by Pcyrana » Thu Jan 10, 2013 8:16 am

The zone panel that you have is what is known as a "master slave" zone panel.
The Zone 1 or "Master" thermostat decides whether the zones will be able to run in heating or cooling based on the position of the zone one thermostats system switch.
The zone one thermostat will output voltage on either the O or B terminal to allow the zones to run in cooling or heat.
If you do not have O and B terminals on your zone one thermostat then yes you will need to use the MCS-DXB.

CoaSal
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Joined: Sun Jan 13, 2013 11:36 am

Re: Thermostat Options for EWC-ST Series Control Panels

Post by CoaSal » Sun Jan 13, 2013 11:41 am

I have two EWC-ST-2C Control panels - one for each floor of the house. These control panels service two separate blowers (oil heat and AC units). Each floor and control panel has two thermostats currently connected, which are outdated.

I would prefer to change all four thermostats to programmable thermos that can be programmed separately for each day of the week.

I've reviewed the list of recommended thermos on this thread, but at best I've only noted a 5+2 programmable thermo. Any suggestions without changing out the control panels?

Your advice is much appreciated.
Dave

Erik W.
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Location: Englishtown, NJ
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Re: Thermostat Options for EWC-ST Series Control Panels

Post by Erik W. » Mon Jan 14, 2013 8:14 am

Dave,

You can use a thermostat with a 5+2 program period, just program your weekends for the same temperature as during the week and you should be all set.

Erik

CoaSal
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Joined: Sun Jan 13, 2013 11:36 am

Re: Thermostat Options for EWC-ST Series Control Panels

Post by CoaSal » Mon Jan 14, 2013 9:34 am

Thanks Erik.

What if i want to program differently for more then a 5+2 allows?

My family is home at different times throughout the week so i would prefer the ability to program monday and tuesday different than wednesday and thursday, etc.

In my prior home i was able to do this by using a 7 day programmable thermo.

But i didnt have this control panel in my last house.

Any suggestions for a fully programmable thermo that is compatible?

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