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Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 20030
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I'm having a problem with pressure relief valve blowing off

Customer Question

I'm having a problem with pressure relief valve blowing off all the time n I changed it n I changed expansion tank to also my bar pressure goes over 3 I'm a home owner n I don't no anything g bout unit
JA: Did you double-check the thermostat? And what about the unit's filters?
Customer: I'm not cumulative with unit where r they
JA: Do you plan on doing the work yourself?
Customer: May b I'm hav trouble getting a service man toto come out to house
JA: Anything else we should know to help you best?
Customer: Wat psi should b in unit
Submitted: 2 months ago.
Category: HVAC
Expert:  Gaztech replied 2 months ago.

Welcome to Just Answer, my name is Luke

NOTE: I can only get paid for assisting you if you RATE ANSWER the 5 star rating

Are you ready?

Expert:  Gaztech replied 2 months ago.

Pressure relief valve are set to open at 30lbs pressure, obviously your system is exceeding that, over pressure is usually cause by a defective water pressure regulator,it is adjusted to stop feeding system new water up to 15lbs, that will probably need to be replaced.

what is your gauge reading? here is a link to show you what to look for.

http://www.ebay.com/itm/Watts-SB1156F-1-2-Solder-Bronze-Boiler-Feed-Water-Pressure-Regulator-386422-/122017706485?hash=item1c68d271f5

Expert:  Gaztech replied 2 months ago.

OK

Customer: replied 2 months ago.
Is gauge the bar pressure
Customer: replied 2 months ago.
It goes up to 3
Customer: replied 2 months ago.
Water come out of relief all the time
Expert:  Gaztech replied 2 months ago.

What does it say in pounds

Customer: replied 2 months ago.
Not sure Wat u mean wher is that found
Expert:  Gaztech replied 2 months ago.

3 bars=43 lbs, way to high, shut off valve that feed new water to system, and replace what I said.

Customer: replied 2 months ago.
Where is the water reg located
Expert:  Gaztech replied 2 months ago.

Did you click on the link I sent you with a picture of what it looks like?

Expert:  Gaztech replied 2 months ago.
Pressure relief valve are set to open at 30lbs pressure, obviously your system is exceeding that, over pressure is usually cause by a defective water pressure regulator,it is adjusted to stop feeding system new water up to 15lbs, that will probably need to be replaced.what is your gauge reading? here is a link to show you what to look for.http://www.ebay.com/itm/Watts-SB1156F-1-2-Solder-Bronze-Boiler-Feed-Water-Pressure-Regulator-386422-/122017706485?hash=item1c68d271f5
Customer: replied 2 months ago.
U want me to replace boiler feed
Customer: replied 2 months ago.
I also hav a super store someone said may b a pin hole in Coil
Expert:  Gaztech replied 2 months ago.

the feed water valve you need to shut off is usually rite next to the pressure valve

Expert:  Gaztech replied 2 months ago.

" said may b a pin hole in Coil"

does not make sense,

Customer: replied 2 months ago.
I clicked n saw boiler feed valve
Customer: replied 2 months ago.
I'm confused sorry
Customer: replied 2 months ago.
My feed is not next to unit
Expert:  Gaztech replied 2 months ago.

thats the part you need to replace..

Customer: replied 2 months ago.
Is that inside unit
Customer: replied 2 months ago.
Wat does it look like
Expert:  Rick replied 2 months ago.

Looks like my colleague had to leave. Do you still need help?

Customer: replied 2 months ago.
Expert:  Rick replied 2 months ago.

Ok, let's start with the easy stuff. Turn the water feed into the boiler off and drain some water out of the system until the pressure on the gauge drops to 15 psi. Also turn the power off to the system. Give it at least 15 minutes if not an hour or more then go back and check the pressure. If the pressure is higher than 15 you have a leak in the SuprStor coil.

Customer: replied 2 months ago.
Is that red handle under the Baxi unit the water shut off
Customer: replied 2 months ago.
The other tech said to change boiler feed n a water pressure regulator
Expert:  Rick replied 2 months ago.

Forget what the other tech said for now. There's no way I can know what your water feed shut off looks like. Every system is different. It part of the onsite piping. If you don't know then I need a pic of the boiler and surrounding piping. You can post a pic here by clicking on ADD FILES next to the SEND button

Customer: replied 2 months ago.
Did u get pic
Expert:  Rick replied 2 months ago.

No. Did you click on add files then navigate to where the picture file is saved?

Customer: replied 2 months ago.
Not sure how to
Expert:  Rick replied 2 months ago.

Please contact customer service. They can walk you through it. Then once you post the pic we can continue from there. Here's a link to customer service
http://ww2.justanswer.com/help

Customer: replied 2 months ago.
The red handle is that the boiler Feed
Expert:  Rick replied 2 months ago.

Like I said before there's no way I can know that. Every job is piped differently and uses different brand shut offs. Each manufacturer has their own color.

Customer: replied 2 months ago.
Ok says it that one Wat do I do next
Expert:  Rick replied 2 months ago.

I have no idea what that means. If you can't identify the water line into the boiler (it's usually 1/2") then I need a picture

Customer: replied 2 months ago.
Ok
Expert:  Rick replied 2 months ago.

Great I can see the pic but I need a wider shot so I can see the piping around the boiler too. I can't tell anything just from this pic.

Customer: replied 2 months ago.
Wat things could it b y pressure relief bliws
Expert:  Rick replied 2 months ago.

I don't understand your last post

Customer: replied 2 months ago.
Wat things could also make the pressure relief valve keep blowing
Expert:  Rick replied 2 months ago.

Assuming the relief valve is functioning properly (only discharging when the system pressure is above 30 psi) the following are the possible causes

1) Thermal expansion: if the pressure only rises to above 30 when the burner is running then either the expansion tank has failed or it is too small

2) A failed feed valve which is letting water into the system beyond its 15 psi max set point. This would happen even when the burner is not firing.

3) A DHW (dometic hot water coil) has a hole in it. In your case the coil in the SuprStor. If the water feed to the boiler is shut off and the burner is not firing AND then the pressure rises you have a leak in the SuprStor coil.

Customer: replied 2 months ago.
Is s boiler feed n water pressure regulator the same thing
Expert:  Rick replied 2 months ago.

yes

Customer: replied 2 months ago.
the arrow goes with flow of water
Expert:  Rick replied 2 months ago.

yes