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Old 10-20-2011, 07:28 AM   #16
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pressure relief valve is leaking on boiler


look at the auto feed valve RED ONE on the water feed what is the setting....typical 12LBs from the factory on the lock down nut that difference as your at when cold then heating the water is pushing the relief to drip....do you know if the tech adjusted it.might want to lower the feed water make up pressure...you'll have to drain off the actual boiler water and keep adjusting the stem(turn CW looking down on the adjusting screw..one half turn at a time)till the water stops at 10-12 PSI...or slightly lower.the circ.pump does the cycling of the water thru the system and that tank has to be open to the system so it can tke the expanded water and keep that PSI below the relief trip


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Old 10-20-2011, 07:20 PM   #17
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pressure relief valve is leaking on boiler


Okay, while the water to the boiler is off, the expansion tank closed we drained water out of the boiler until PSI was 0. We quickly removed the old pressure valve. Put plumber's tape on treads and put the new pressure valve on correct. NO LEAKS .... Yeaaaaaaaaa! PSI is almost 10. Then we drained the expansion tank.

Then we open water to boiler and the expansion tank PSI is 12. We turned boiler on. But you could hear water moving in the boiler? Is this normal? We turn boiler off, PSI is 17.

We decide to check the radiators on both floors to make sure water is in system. All but one has water, I will take time to bleed the one radiator tonight, So we figure its okay to turn back on.

We've had system on for under and hour and PSI is 22. What should we do? Still hear water movement in boiler and pressure is slowly raising?
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Old 10-20-2011, 07:36 PM   #18
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pressure relief valve is leaking on boiler


PSI is now 25!!! Shutting boiler off.
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Old 10-20-2011, 07:53 PM   #19
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pressure relief valve is leaking on boiler


your hi pressure is coming from the cold water over feeding it should stop at 12psi as tagged check right on the feeder info tag...thats what causing the heated hi pressure...drain it down again taking the pressure off that guage turn the stem CCW up close the drain off,and let the water feed and stop then keep tweeking it CW till the guage hits 12psi cold off no heating no burner.then when you bleed the rads no circ or heat running all off.you have to have the boiler pressure gauge at 12 psi or lower COLD please realize the new relief is for heated water right when the stat satisfies at set point and should be tops 20PSI..what are you missing here work the water feed psi down to make room for the heated water...the relief is doing exactly as designed SORRY.....last post got it backwards on the PSI adjusting that water feed stem(looking down on it) its CW to raise cold water pressure and CCW to lower the pressure after a quick drain off to release the actual boiler of pressureNOTE you can't adjust the cold water feed with a hot or running boiler must be off and cold...

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Old 10-20-2011, 09:22 PM   #20
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pressure relief valve is leaking on boiler


Let me make sure I understand what you think I should do to lower PSI.

1. turn of water to boiler. Do I close expansion tank or keep it open?
2. turn off boiler and drain it to 0 PSI.
3. loosen the hex screw nut on Pressure Reducing Water Feed Valve
4. then turn the slotted adjusting screw counterclockwise (a little) to lower the pressure.
4.5 tighten hex screw back
5. turn water to boiler back on (and expansion tank, if I closed it)?
6. then look to see if the pressure is around 12 PSI? How long do I wait for pressure to go up after turning water back on?
7. repeat until I get to 12 PSI with a cold boiler.

Is this what you are saying to do?

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Old 10-21-2011, 07:02 AM   #21
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pressure relief valve is leaking on boiler


I say replace the water auto fill valve with a new one, it really shouldn't need adjusting, usually when it keeps feeding they are replaced once you start adjusting and messing with it becomes nothing but trouble especially if your not used to doing it. Now is the time not in the dead of Winter.
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Old 10-21-2011, 04:23 PM   #22
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pressure relief valve is leaking on boiler


Technically. the manual shut off valve for the auto feed is not suppose to be open, except when you are filling or bleeding the system. During normal boiler operation, its suppose to be closed.
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Old 10-22-2011, 01:36 AM   #23
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pressure relief valve is leaking on boiler


Sorry I'm using wrong terminology. The auto feed valve is in the down/auto position (open for when the boiler needs water), not in the up position (when water freely flows to boiler).

We think we should just purchase a new auto feed valve instead of chancing incorrectly adjusting the feed valve. I do have a quick question - a friend told me to try this:

1. drain water from boiler until it reaches 12 - 15 PSI
2. shut off water going to boiler
3. turn boiler on
4. watch to see if PSI gets higher, if it goes past 20 PSI - shut boiler off.
5. if it stays around 12 PSI for a few hours then its the auto feed value.
He thinks this will let me know for sure its the auto feed valve and give me a chance to warm building. Could doing this for a few hours harm the boiler? Would this let me know its the auto feed valve?
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Old 10-22-2011, 05:15 AM   #24
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pressure relief valve is leaking on boiler


It won't harm the boiler. It ill indicate it may be the feed valve, but won't prove it, since it could also be a restriction in the pipe going to the expansion tank. Turning off the manual valv before the auto feed, and letting the boiler sit without running for few hours, and then seeing if the pressure increases, will tell you if its the auto feed or not.

And again, the manual feed valve is suppose to be closed at all times, unless your adding water to the boiler. Because you are bleeding rads, or refilling the system. Its not suppose to be open for normal operation. If the boiler were to spring a leak, or a rad, it would flood your house.
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Old 10-22-2011, 07:22 AM   #25
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pressure relief valve is leaking on boiler


Are you talking about a manual fast fill valve or the hand valve that feeds the auto fill valve. If it's the latter I would leave the valve open that feeds the autofil and see if the pressure rises. If it keeps rising it's time for replacement. 99% boilers have the autofil valves open all the time, not saying it's correct but it's fact. Would rather have a flood than a blown up boiler or burnt up boiler. Homeowners for water damage.
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Old 10-22-2011, 08:50 AM   #26
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pressure relief valve is leaking on boiler


Quote:
Originally Posted by COLDIRON View Post
Are you talking about a manual fast fill valve or the hand valve that feeds the auto fill valve. If it's the latter I would leave the valve open that feeds the autofil and see if the pressure rises. If it keeps rising it's time for replacement. 99% boilers have the autofil valves open all the time, not saying it's correct but it's fact. Would rather have a flood than a blown up boiler or burnt up boiler. Homeowners for water damage.
Boiler won't blow up because of low water. Plus it should have a low water cut off. If it doesn't, one should be installed. Water damage from a leak can cost more to fix then a replacing a boiler.
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Old 10-22-2011, 03:50 PM   #27
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pressure relief valve is leaking on boiler


I would rather trust my life on a flooded house than a malfunctioning low water cutoff, or some other control subject to failure at any time. Besides if I do have a leak it will leak at 12 pounds not 60-100 pounds, I know even at 12 it will still do a job on the house. Remember washer hoses, washing machine hoses, are always subject to leak. I put my money on leaving the autofil valve open 24/7 as millions of others are. Why are autofil valves required? Please advise?
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Old 10-22-2011, 03:57 PM   #28
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pressure relief valve is leaking on boiler


isn't this a hot water boiler the feed stas open all the time bleeding or not the red pressure regulator will maintain 12psi.if you don't have room with heated water tripping the relief set the reg lower 5psi 7psi as long as there is water before it gets called to heat...and there is no low water cutoff on a hot water boiler only boilers with steam heat risers....lets keep it in line this guy is confused enough
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Old 10-22-2011, 04:11 PM   #29
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pressure relief valve is leaking on boiler


Quote:
Originally Posted by COLDIRON View Post
I would rather trust my life on a flooded house than a malfunctioning low water cutoff, or some other control subject to failure at any time. Besides if I do have a leak it will leak at 12 pounds not 60-100 pounds, I know even at 12 it will still do a job on the house. Remember washer hoses, washing machine hoses, are always subject to leak. I put my money on leaving the autofil valve open 24/7 as millions of others are. Why are autofil valves required? Please advise?
Auto fill valves are not required.

They are for filling the boiler to the required pressure after installation, or topping it off when you bleed the air out. The installer is suppose to set it to the proper pressue for the applicaton its in. And then after having filled and purged the system, close the manual valve.

They are also what has caused boilers to crack when the burner becomes a run away. Because they add cold water to a hot cast iron boiler that is too hot.

An auto fill valve won't prevent a boiler from running dry, as many become clogged, and most don't even know it doesn't work. They also cover up leaks on in floor radiant systems, and cause sink holes under the slab.


What protection do you think an auto water feed provides?
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Old 10-22-2011, 04:18 PM   #30
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pressure relief valve is leaking on boiler


From the B&G installation instructions.

WARNING: Injecting cold water into a boiler that
has overheated due to uncontrolled firing and/or
improper water level control, can cause excessive stresses
in boiler components and possible rupture of the boiler.
This will be prevented by proper selection and installation of
a water level control and burner safety controls. The shutoff
valve at the pressure reducing valve inlet must be closed
except when filling the system, after installation, or after service.
Failure to follow these instructions could result in serious
personal injury or death and property damage.

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