new furnaces for a church Help

kevin coppinger_4

ton more sense to do the boiler w/ air handlers.Much smaller and zoning is easier. are you locked in two only two air handlers? coild you do three or four? kpc

GW

new furnaces for a church Help

Hello wall,

I have a church I'm looking at replacing their two 12 year old gas furnaces, no AC. The current models are low boys with power burners, and the boys at Thermopride can produce replacements. The current models are rated at 375,000 capacity, does this mean in or out? I will get back to do a heat loss on the building.

My question is might it make more sense to install one boiler with two AHU? If so, who makes AHU this size? Would it have to be custome made? If so, I'd rather stick with the conventional set up.

Thanks for any help,

Gary

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GW

could do more

if it makes more sense for the committe

GW

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Jared M. Dean

Depending on prices of 2 large BTU hot water coils coupled with large capacity air handlers - you could use 4 smaler capacity air handlers and hot water coils twinned together. This could also enable you to do some 2 staging. Has worked for me in the past and may be more cost effective. Key word: MAY

Jared

Steamhead

Plus

if the church has a kitchen, you can satisfy the kitchen's hot water needs with an indirect heater running off the boiler. These cost more than standard water heaters, but are much more efficient and last longer.

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Steve Ebels

What we did

A local church was adding a 2 level (basement and main floor classroom/fellowship area to their exsisting building. The new part is 4800 sq ft and the old part is 3900 sq ft. A fuel oil furnace served each level of the old building through seperate duct systems. Combined firing rate of the two furnaces was 2.25 gph for 315,000 btu's gross input.
A heat loss of BOTH the old and new parts revealed a load of only 186,000 btu's at -15*.

We approached it this way:

Both duct systems in the existing part were "siamesed" (izat a wird?) together on top of a 110,000 btu air handler. Zone dampers were installed to provide control for both levels. The new part is heated with panel rads. (guess which part the folks say is more comfortable?) The whole system is fired with a Vitorond VR2-50 with an output of 172,000 btu's. This is about 8% shy of total load calculation. The boiler never came close to running even 50% of the time at temps of 10-15 below last winter. I think we'd have to stay at design temp for several days in a row before the boiler began to run more than that. Moral of that story is that I've never seen a properly done heat loss come up low. Don't discount the fact that their furnaces are probably way oversized.

From that scenario you could visualize using a smaller airhandler or two with zoning and maybe adding some rads to the building you're looking at Gary. Rads make a lot of sense when you consider that through the week they may only need 1 or 2 rooms heated to occupied temps. The rest of the building could run off the duct system and setback t-stats.

Just some food for thought.

tim smith_2

church heaters

Trane commercial products usually has large enough air handlers and water coils for this size of job. They very likely have a single unit big enough.

Bob Boltz

Boilers

In PA, if you install a boiler, you must get Labor & Industry approval. That means, Boiler Room - Fire Rated,permiting with state, and all the related controls. On warm air systems, they have no rules?

John Mills_3

I'm looking for

a downflow gas furnace, 500-600,000 btu to replace one. A/C is in a coil box below it, just like residential.