Weil-McLain Ultra Series 3 MAWP?

JohnNY

Does anyone know the max working pressure of a WM Ultra Series 3CT?

I can't find it online and I have a client asking me to put one in the cellar of a 6-story building.

Abracadabra

"Maximum allowable working pressure 30 PSIG water as listed on the rating label."

http://www.weil-mclain.com/en/assets/pdf/C-2003 (0813) UG3- CT Suggested Specs Editable.pdf

http://www.weil-mclain.com/en/multimedia-library/pdf/weil-mclain-pdf/products/discontinued/discontinued-boilers/ultra-series-boiler/ultrambs.pdf
Page #3
Additional considerations #3.

icesailor

If you figure a minimum of 10' per floor, that's 60' if the boiler is in a basement and the top floor radiation is 60' above the boiler, that equals 26# PSI. Not a lot of wiggle room in the system.

JohnNY

abracadabra, are you sure that's for the Series 3?
I could've sworn I'd heard that the newest Ultra would allow a higher mawp.

Thanks a lot.

RobG

You could look at the HydroTherm KN series boilers, they are rated at 100 psi. I think Wales Darby is the rep for NY.

SWEI

We have a system running about as close to the limits of a 30# relief valve as one can get. System height is 54 feet and it's running at 28-29 PSI. Boiler pumps on the 399's pump away from the boilers (firetube HX) to prevent the relief valves from burping on the differential pressure.

Abracadabra

JohnNY said:

abracadabra, are you sure that's for the Series 3?
I could've sworn I'd heard that the newest Ultra would allow a higher mawp.

Thanks a lot.

yeah.. pretty sure.. the relief valve they supply with it is still a 30psi. docs for the series 3 say 30psi.

RobG

A little off topic but why don't manufacturers test their boilers for higher working pressure? If HydroTherm can do it, why can't others? I used to use the HydroTherm modular boilers quite a bit and they were 75psi.

BobC

I'll bet higher pressures mean you have to use more lawyer repellant and we all know how expensive that is!

Bob

Rich_49

Johnny , this has an 80 PSI MWP for the 285 and 399 units .
Click specifications , this is available where you are also .

http://www.htproducts.com/commercial-eft-documents.html

JohnNY

Thanks, guys. Rich, I'll look again at the HTP but I'm enjoying the Lochinvar line at the moment. The Knight XL is certified at 160psi and I like the control interface and customer support I get (hello, Jerry Katz) at Wallace-Eannace.

I've got a client asking for the Ultra, it happens a lot so I accommodate, and I'm checking to see if it's compatible with the conditions.
I guess it isn't.