Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
If our community has helped you, please consider making a contribution to support this website. Thanks!

vacuum system

Options
Roger Vance
Roger Vance Member Posts: 7
in THE MAIN WALL
We have a heating system with 12psi. Condensate goes to the condensate tank. 2 Pumps are alternating pumping condensate out of the return tank. After cond. pump runs it pumps condensate down to approx. 3in. in gauge glass. The pump shuts off and the cond. siphons below the gage glass. Why would this happen installed a new check valve in line that was bad. put a combination gauge (press/vac) and when water siphons out of gage glass there is a vacuum of 1-2psi on the system. this one has me baffled. even thought the pump when it shuts off (spinning) would cause the vacuum but this is not the case. Any help would be appreciated.

Comments

  • Brad White_9
    Brad White_9 Member Posts: 2,440
    Questions for you, Roger

    1. What is the pump outlet piping configuration? Does it rise and then drop into another line? This may create a siphon effect thus drawing a vacuum.

    2. Is the receiver vented and if so is it open and clear? Nothing like an open vent to break a vacuum.
  • Roger Vance
    Roger Vance Member Posts: 7


    piping is 1-1/4". No it does not rise. The heating system is on a second floor. This 1-1/4" pipe goes to a pit( where) water, DHW<DHWR<HP steam 100# then to a power plant approx. 150 yds away. No piping has been changed just new seals and gaskets (and they) don't leak. The reciever is vented and I am assuming that it is clear. the thing that has got me puzzled is where the vacuum is coming from and it never did this before. After it gets to the power plant it dumps into a cond. return tank .
  • Roger Vance
    Roger Vance Member Posts: 7


    piping is 1-1/4". No it does not rise. The heating system is on a second floor. This 1-1/4" pipe goes to a pit( where) water, DHW<DHWR<HP steam 100# then to a power plant approx. 150 yds away. No piping has been changed just new seals and gaskets (and they) don't leak. The reciever is vented and I am assuming that it is clear. the thing that has got me puzzled is where the vacuum is coming from and it never did this before. After it gets to the power plant it dumps into a cond. return tank .
  • Roger Vance
    Roger Vance Member Posts: 7
    reply

    piping is 1-1/4". No it does not rise. The heating system is on a second floor. This 1-1/4" pipe goes to a pit( where) water, DHW<DHWR<HP steam 100# then to a power plant approx. 150 yds away. No piping has been changed just new seals and gaskets (and they) don't leak. The reciever is vented and I am assuming that it is clear. the thing that has got me puzzled is where the vacuum is coming from and it never did this before. After it gets to the power plant it dumps into a cond. return tank .
  • Brad White_9
    Brad White_9 Member Posts: 2,440
    Lay off the 'post' button, Roger

    until you are done typing... :)
  • Roger Vance
    Roger Vance Member Posts: 7


This discussion has been closed.

Categories