Pressure

john_35

Are you sure you got all the water out of the expansion tank? If it doesn't have a way to break the vacuum (let air back in to replace the water you take out) it will only drain for maybe 30 sec before it loses pressure and starts to pull into vacuum. Then it will slowly drain (glug glug glug) over maybe an hour or more. Many times they only have
a boiler draw-off in them.
If you didn't get the water level down in the exp tank the water pressure will go back up every cycle. If there's a domestic coil in the boiler it may be leaking the higher pressure (street pressure) into the main water jacket, too.

Walt Kwiatkowski

Pressure too High

I have a GlowCore boiler and the pressure is too high. The pressure is up to 50psi and I am out of ideas on how to get it down to the normal range. I tried recharging the expansion tank by draining out all of the water (turning the supply off between the boiler and tank). I tried adjusting the inlet valve. It doesn't matter where I have the inlet valve adjusted, the pressure will always be around 50 and sometimes 60 psi. I recently had replaced the pressure sensor, the heat exchanger, and the ingniter. How can I get the pressure down? What would cause the pressure to be so high?

Thanks,
Walt

ed wallace

hi pressure

is the relief valve letting out water? if not could be a bad gauge and not a pressure problem

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Walt Kwiatkowski

The releif valve is letting out water when the pressure hits 55-60 psi. I attached a sperate pressure valve to one of the outlet valves on the pipes and it reads the same pressure as the boiler. I just don't know what to do to reduce the pressure in the system. Thanks for the input!

Stumped in Michigan,
Walt

[Deleted User]

What water heater do you have?

Is it part of, or connected to the boiler? It could have a leak between the street pressure side and the boiler pressure side.

It could also be the boiler feed pressure reducing valve, with something holding the valve partly open.

Noel

Al Letellier

GloCore

Which side of the unit are you measuring the pressure? And what is the rating of the safety valve? What pressure is it supposed to relieve at? the GloCore boiler have an extremely high head and usually need a large capacity circ to move the water. Are you creating head pressure with the pump? Check out the layout of the piping. GloCore used to use a pressure switch for their flow sensing device and this lead to many heat exchanger failures. You may have a higher rated safety valve for this reason.

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