laars HWG installers out there?

GW

we have a local energy engineering firm specifying these units for apartment buildings.

Put in one the other day. The circ doesn't move water; the circ is supposed to point down? I don't understand the process with the thermostatic valve and such, can anyone share their tips on this?



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[Deleted User]

Never worked on one before, but...

heres what I found on line.

http://www.laars.com/documents/heatsystems/96serv.pdf

ME

Paul B._2

HWG internal flow

Hi Gary,

I'm guessing you may be working with Partners in Energy/Rise Engineering out in Springfield. They use our products quite a bit.

The HWG is a non-ferrous domestic water heater, with a primary copper fin heat exchanger, along with a stainless steel economizer coil surrounding the copper fin coil.

We can't condense in or on the copper coil, so the thermostatic mixing assembly makes sure that the water temperature entering the copper fin HX is at least 140°F.

Take a 20° rise across the copper HX and the minimum outlet temperature will be 160°F. You have to keep in mind when designing a system with one of these that a storage tank is a requirement, not an option. The tank aquastat will determine the actual stored temp, not the heater operating control. Just because the heater outputs a high temp doesn't mean the system has to operate at a high temp.

If you have one that isn't pumping I'd pull the circ cartridge out and see if it's seized up. Especially if it has been in someones inventory for a few months.

If it's a piping question, or you think someone has made modifications to the heater, post some additional questions here, or call me Monday at the factory in Rochester NH. 603-335-6300 X 562.

Paul B.

GW

Thanks, I'll give you a call, yes it is rise. I need to understand the thing a bit more and an idea what parts i may want to stock

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