To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Vaporstat sticking / biasing after vacuum
Have a L608A 1046 2 Vaporstat picked up used.
Generally works well, though I can gripe that the faceplates are only approximate indicators, requiring one to rely mostly on the low-pressure gauge, and that this particular Vaporstat cannot diff less than 3 ounces.
But today I nailed down a problem that has been most vexing. Due to a lack of pipe insulation (coming this summer) the furthest radiator hammers when the system exceeds 8 ounces. I've set the Vaporstat to 4.5 cut-in 7.5 cut-out and most of the time it works fine.
Yet every now and then that radiator starts hammering away. I run down to the boiler and, there it is 9 ounces on the gauge!
Was observing the system just now and finally saw that what's happening. After long cycles all the vents close and the system pulls a decent one-inch vacuum as it cools. I was watching the needle on the expensive low pressure gauge reversing half way around the dial worried it would wreck the gauge when the Vaporstats makes a loud WHACK sound and gives me a start.
Seems when the vacuum pulls hard the mechanism jumps from a neutral balanced state to a negative stop of some kind, overcoming a good deal of friction.
Then on the next cycle the Vaporstat biases a full ounce-and-a-half, possibly two ounces higher than the nominal setting of 7.5 ounces and then WHACK again and it's back to normal.
After detaching the Vaporstat at the union, I was able to reproduce this behavior by simply sucking and blowing on pressure inlet.
Has anyone see and/or dealt with this sort of glitch? I'm quite pleased the system is tight enough after 90 years that it may be possible to experiment with vapor-vacuum, but for the moment I'd just like to get that Vaporstat behaving properly after cycles ending with vacuum.