Outdoor reset on Steam?

John Shea

Ran into it on a job, but it makes no sense to me. Wouldn't it ultimately equal short-cycling?

Would there be any advantage to keeping the boiler water warmer? Seems like wasted energy to me.

confused.

Steamhead

In a multi-family building

it makes sense to use reset on any system- this way the tenants can't tamper with it.

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Al Letellier

steam reset

It's not a reset control, is it? Usually we use a cycling control on steam which tells the boiler how long to run during a given time period. Once set to supply desired indoor temp at outdoor design, the outdoor sensor can then shorten run cycles as the outdoor temp rises. Check out our story on "find a pro". We used a Heattimer cycling control on a large commercial job here in Portland and cut fuel consumption 60%!!!!! Used in conjunction with TRV's, it can return HUGE savings, and is very effective on residential jobs as well. Don't knock it until you've tried it!!!

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John Shea

Excuse my ignorance, but...

what are you refering to, that tenants could tamper with? t-stat? TRVs?

John Shea

I think it is a reset. Honeywell, maybe.

Thanks for your time. You guys amaze me everytime I come to the Wall.


I will check the control make/model.

The cycle-control you refer to makes a lot of sense to me, but based on what I've read about resets, they have a direct ratio with water temp on hydronic systems. Could a reset, then, even be used on a steam system? Or could it possibly act as a "cycle control"?

Also, how does that work with the t-stats anticipator?
How would you determine the proper settings for a reset/cycle control?

oil-2-4-6-gas

Heat Timer --has steam reset for large commercial buildings //model SRC

[Deleted User]

MH imported the

Centra from Europe for years. W/ the proper plug in modules, it could do most any control scheme anyone could devise. No longer available.

When used in a steam application it was not a true reset control. It duplicated, sort of, the Heat-Timer or 269 Tekmar. Both of these controls use a temperature/time (cycle) scheme for steam heat control.

Both are good controls. The 269 Tekmar is less expensive & more flexible (when fitted w/ add on clock) than the EPU Heat-Timer.

Al Letellier

steam \"reset\"

You're talking two completely different animals here, John. Hydronic reset controls and the theory behind them have no application on steam. You have to get water above 212* to get steam, so you can't do any "reset' for steam. All you can really do is set the amount of time you produce steam, heance the "cycle" control.

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