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QUESTION:I have a problem with a system that serves vav boxes. my problem is that
the system is running constantly and I dont know where my water is
disappearing to but I nee to fill it often. My fead supply is on the
discharge side of the pump so as long as the pump is running I am above the
standard 12psi pressure that the regulator supplies at. My vav hat water
supply is controlled by a two way valve that lets the water bypass the
exchanger and back into the return piping. My problem is or I think my
problem is , while my water leaks out in time a few weeks or so I am not
getting any new water added due to supply pres and due to the loss of water
my suction presser drops into a negative pres causing air to be sucked into
into the return through the air bleeds. I am not sure if the water feed
should be on the return or the supply side of the pump,and weather the air
bleeds should be on the return or supply side. I think I need to program it
to shut down at least an hour a day to help with the feed. DOES ANYONE
HAVE A BOILER DIAGRAM ( LAYOUT) THEY CAN SEND ME?
ANSWER: You have nailed the issue - water is leaving what should be (
from your description ) a closed system. Not good.
There is no magic answer here - you need to find the point of
exit, and the cause of it.
Likely source would be T&P valves periodically discharging.
Put a piece of paper towel under the discharge of all T&P valves on
the system ( don't block them or their drains ! ). Check them
periodically. If they show signs of being or having been wet, you
have your answer ( or part of it ).
Less likely ( I hope ! ) would be breaks in the piping, or
drain valves open / partially open.
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