NJT Sticky for PRV/Expansion Tank

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Old 12-20-15, 01:17 PM
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NJT Sticky for PRV/Expansion Tank

first off, thanks NJT for the help. had a massive leak from the relief valve and replaced that and the expansion tank. I followed everything to the "T" and it worked out...........except....

in Step 3, after shutting off the boiler and water, I tried draining from the bottom boiler drain (attached to boiler not the zone drains) and only a cup of water came out.

after that I tried the a zone drain and nothing. also tried the old PRV (before replacing) and it just dribbled. so replaced the PRV and shut off the valve above the tank and slowly unscrewed the tank. I felt the water spewing so my wife had a bucket under it. ended up doing it in stages. 2 turns then let it dribble, 2 turns again and let dribble, and so on and so forth for about 15 minutes.

didn't help, because on the last 2 turns water came spitting out. wasn't planning on showering that early in the day, but....

anyone know what I missed? or what else I could have done to avoid it for next time?

thanks
 
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Old 12-20-15, 02:15 PM
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When you try to drain the water out of anything.... a boiler or a water heater...... you have to let air in to allow the water to come out. Otherwise the draining water puts the tank under a vacuum and either nothing comes out or you'll get a little gurgle every few minutes.
 
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Old 12-20-15, 02:19 PM
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thanks, figures....

how is that done?
 
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Old 12-20-15, 02:21 PM
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I usually open the relief valve and the drain valve and the boiler will empty
 
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Old 12-20-15, 02:52 PM
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thanks again, but I tried that before replacing the relief valve...
 
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Old 12-20-15, 02:57 PM
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Without seeing pictures of what you have it would be hard to make a recommendation.

http://www.doityourself.com/forum/el...-pictures.html
 
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Old 12-20-15, 03:03 PM
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Old 12-20-15, 04:49 PM
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oh well....just jinxed it..

everything was fine till 5 hours after install. went down and boiler temp was almost at "0". waited and it wouldn't come on. raised the thermostat and a few seconds later....poof. about a 1/4 pail of water came out the relief valve....no more dripping so far after that.

not sure where to go from here
 
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Old 12-20-15, 05:23 PM
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To empty the system - to let air in - you could remove the bleeder unit after closing off the zone lines.

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Boiler temp shouldn't have been below at least room temperature.
Do you mean system pressure was 0 ?
 
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Old 12-20-15, 05:38 PM
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thanks. the Hi-Vent thingy, correct?

and yes, sorry, I read the gauge wrong. it only goes down to "70". just assumed it was "0"
 
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