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quick question

Paul S_3
Paul S_3 Member Posts: 1,261
im installing (2) Williamson gwa 50's with an output of 38k.. for each apartment....heat loss is about 33k at 0F....i would like to protect boilers with a 1/2 line in front of pump to return with globe valve in line.....what woukd you guys do "real world" BPvalve isnt in budget either is iseries....thanks Paul S
ASM Mechanical Company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
ASMMECHANICALCORP@GMAIL.COM
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company

Comments

  • hot_rod
    hot_rod Member Posts: 22,791
    What type of heat emitters. It's rare to need protection with fin tube or any low mass types. Cast iron rads?

    The only absolute means of providing return protection is with a devise that can detect and respond to temperature. Bypass valves or pumps, they just guess :)
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Paul S_3
    Paul S_3 Member Posts: 1,261
    one system CI bsbd...other CI rads
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    ASMMECHANICALCORP@GMAIL.COM
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
  • hot_rod
    hot_rod Member Posts: 22,791
    Heat emitters already installed? If the emitters can dissipate the heat energy faster that the boiler provides it, you have the potential to run below dew point.

    The thermal mass and volume of system fluid would factor in also.

    The two ball valve balance method is only good for the single condition you set it for, above or beyond either it doesn't protect, or bypasses more than needed.

    There is always the "poor mans method" :)

    Some of the basic Viessmann cast iron boilers had an additional aqustat that turned off the pump when the boiler dropped into the low return temperature conditions. A simple, somewhat crude, bang-bang method of protection.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Ironman