77 year old C.A.Dunham vapor ststem

Jim Bennett

In The Library section at the top of the page, there are two things listed under "Steam Heating":

"Dunham Differential System" and "The Dunham Victory Line"

Don't know if these pertain to your system or not.

You may want to get in touch with Steamhead here at this site.

Good Luck,

Jim

STEPHEN_8

77year old C.A.Dunham vapor system.

this system is complete a dunham diff. vapor system ,dunham traps rad valves ,vac pump size dhla serial 4124 air elimnator trap# 22oo. i had the pump apart in1976 and made it work till 6or7 years ago now the owner wants the system restored. i have chased from dunham to mepco to skidmoor looking for spec. info and parts. this system is a nice system and seems worth saving.

Steamhead (in transit)

That's more than Vapor

it keeps the whole system under a vacuum during mild weather, not just the return lines. Whoever had this put in went first-class. BTW, check the pump model number again- sure it isn't the DH2A?

The DH residential version of the Differential Vacuum system wasn't made for very long. It appears in the Dunham #414 Handbook which came out in 1929, but disappeared in a few years no doubt because of the Depression. We have some info on it in the Library- go here to see the PDF:

http://www.heatinghelp.com/pdfs/323.pdf

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Ken_40

Stephen,

Got any photos?

The boiler's surely not sill coal! What's firing the system now? What fuel? BTU-size

STEPHEN_8

77 year old dunham differential system

up date on dunham diff system the pump is a DH2A made 1929 the system is now oil fired at 3.00 need to replace pump to start.