Where to set WWSD?

J.C.A._3

It depends on a couple of things. I just found one that I set at a reasonable 63° was in the shade, up against a rock(granite) foundation and the temp in the outside air was almost 70°. The pump kept going, so I'm toying with it to find the right temp in the wwsd thermister spot to make the place run a nice curve.

It takes some fine tuning to make a system work to its best capacity, but time spent figuring the right ones make the customer happy.Chris

Luke Lefever

Just wondering if where we've been setting Warm Weather Shut Down is appropriate for our design conditions. (Northern Indiana). I usually set it about 55F. Is that a little low? thanks, Luke

Unknown

Depends

on the construction of the house. If it's of tight construction and high mass I think 55ºF is good.

For older homes that are not so tight and of low mass I would go with 68ºF.

Gary

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John Felciano

WWSD

We use 68*,never had any complaints

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Boilerpro_3

Also depends on....

Population density in the structure. For apartment structures, 55F is a good starting point. For offices theis probably is also about right, since computers lights, etc. heat structure. If you have lots of solar gain it could be even lower than 55F.

Boilerpro

Steve Ebels

I have

Set them anywhere from 55* to 65* depending on the structure, the equipment in the structure and the occupants wishes. So, in other words, it depends.

ScottMP

Three days

At 57 and I would think you would have some complaints ?

Now a lower heating curve I could see depending upon location. Am I missing somthing ?

Scott

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Unknown

Also bear in mind

that the building may have elderly occupants that may be on medication. These folks will need heat even when outdoor temperatures are in excess of 75 to 80 degrees F. Setting the WWSD that low will deprive them of that ability whether the building is built like a thermos bottle or not. I am a believer of setting the WWSD to the type of construction, system and the individual needs of the occupants.

Glenn Stanton

Burnham Hydronics

Boilerpro_3

Remember it usually drops to 57F at night

but go up to 70F + in the day. O your average daily temp is about 64F for shut down. Internal gains make a big difference for the building balance point. I ran this calculation for our local high school and between the heat output 350 students, the teachers and staff, plus 100 kw or so of lighting and then computers etc, The internal gains not including solar were on the order of 250,000 btu/hr. In a building with a heat loss rate of about 12,000btu/hr/F, that means not heat is needed down to about 50F outdoor average temp. So about 40F at night and 60F during the day.

Boilerpro

ScottMP

I agree Glenn

But my thoughts where that regardless of heat gain during the day the thermostates would shut off/on the heat to the rooms. WWSD , I thought, was only a fail safe for overiding thermostates on days when it is not needed. Really not a design issiue. I supppose if RTU's are used this would be more important ?

Scott

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Unknown

Depending on

the individual needs of the occupants and the type of control system, WWSD really needs to take into effect the required temperature for any individual zone with the highest temperature setting. If the system is controlled by thermostats. WWSD setting on the control is the ruling factor. If the system has RTU's such as our EC-5000 control or the Tekmar House Controls, WWSD is going to be established by the highest setting of any one of the RTU's.

Different strokes for different folks is the name of the game and you have to consider the temperature requirements of these individuals. My mother spent the last 11 years of her life in a nursing center where the indoor temperature was maintained at 80 degrees. These folks need the warmth to keep them comfortable as do people that may be in convolescence regardless of their age. Hope this helps.

Glenn

Mark J Strawcutter

What Would Steamhead Do? (nm)