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Old 01-06-2009, 05:28 PM   #1
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Bleeding heater expansion tank


How do I bleed my heater expansion tank.Some one told me once , but I forget how to do it. They said that I should do it once a year .Thanks

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Old 01-06-2009, 08:42 PM   #2
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Bleeding heater expansion tank


You shouldn't need to do it every year. Unless its undersized.

Is there a shut off valve between the tank and system/boiler?

Or does the valve that goes into the tank have a drain fitting on it, plus a small plug in the same fitting.

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Old 01-07-2009, 09:21 AM   #3
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Bleeding heater expansion tank


thers a shut off valve on bottom of tank with a bleeder screw on the valve
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Old 01-07-2009, 09:25 AM   #4
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Bleeding heater expansion tank


The vave that goes into the tank has a drain fitting on it ,plus a small plug in the fitting
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Old 01-07-2009, 03:55 PM   #5
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Bleeding heater expansion tank


Then connect a garden hose to the drain.
Open the valve the whole way.
When you hear the water stop draining. Open the plug to let air in to drain it the rest of the way.

After its completely drained, put the plug back in. Then close the drain valve.

Draining the expansion tank every year, is one of the things that causes increased fuel consumption, and shortens boiler life.

Fresh water is an enemy of boilers.

PS: The valve also has the line from the system running to it also, correct.
If not, then turn the valve off from the system to the tank.
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Old 04-10-2009, 07:19 PM   #6
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Bleeding heater expansion tank


Hi Guys, I actually had to do just this last night as I started to get residule overflow coming out of my relief valve from my boiler. Here's the problem, after doing exactally as posted here, my overflow bucket is now filling up faster than it did before I drained the expansion tank, and ideas? (Before the drain, 5 gal bucket would take two weeks worth of dripping to fill up, after the draining, half of the bucket filled up overnight, and still dripping.)
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Old 04-10-2009, 08:25 PM   #7
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Bleeding heater expansion tank


Probably have a bad autowater feed.

Shut the manual valve off.
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Old 04-10-2009, 09:57 PM   #8
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Bleeding heater expansion tank


I think I may have done the process incorrectlly, I didn't wait until all the water stopped, then open the bleeder. I re-did the process tonight, by letting all the water come out and stop, then opening the bleeder to release the rest of the water from the tank. After doing that and closing the bleeder, then the tank valve, I opened the system valve and a lot less water flowed into the tank, sound right? I'll know tomorrow, but curious about the difference with a lot less water flowing into the tank after re-doing it.

p.s. I forgot to say that the auto feed valve did shut off after it refilled the boiler, so I think its OK.
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Old 04-11-2009, 04:56 AM   #9
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Bleeding heater expansion tank


If you didn't drain the tank the whole way first time. That would explain why the relief valve had to do its job.

Depending on system, boiler and tank size.
The tank should only be 1/3 to 1/2 full.
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Old 04-11-2009, 09:51 AM   #10
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Bleeding heater expansion tank


Well, I check it this morning after draining the entire tank last night, and I've got about 3 inches of water in the bucket already, I must have a bad Pressure Relief Valve, sound right?
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Old 04-11-2009, 11:08 AM   #11
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Bleeding heater expansion tank


You might.

But. More often, it the autowaer feed.
They bleed water in slowly. So slow that you can't hear it feeding water in.

Drain your tank again. Allow it to fill to normal operating pressure.
Then shut off the manual valve that is either before or after the autofeed. See if the relief opens again tonight.
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Old 04-11-2009, 11:25 AM   #12
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Bleeding heater expansion tank


It might be his bleeder on the expansion tank also. He shouldn't be getting any drip at all, much less 3" overnight. If his relief on the boiler is dripping or dribbling the relief should be replaced and the system pressure checked at operating temperature and adjusted for no more than 20 P.S.I. at Hi-limit cutoff. The boiler manufs. and some of the parts manufs. will void their warranties if the auto feeds are left turned on 24-7 and if he turns them off as you suggest (which is good) he could ruin a boiler if he doesn't have a low water cutoff in the burner ignition circuit.

Last edited by Grampa Bud; 04-11-2009 at 11:29 AM. Reason: Rectal cranial inversion
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Old 04-12-2009, 09:13 AM   #13
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Bleeding heater expansion tank


Those tanks were designed as maintenance free tanks never requiring draining. The problem is we still insist on installing automatic air vents on these systems. My rule is "no bladder = no auto vent"
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Old 04-13-2009, 07:41 AM   #14
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Bleeding heater expansion tank


Hey guys Ijust reread these threads and it occured to me where I have run to this problem before. Rickyraye make sure you have the isolation valve between the expansion tank and the boiler or the system fully open. If you don't the system has no where to expand and will try to pop open the weakest links in the system. RELIEFS and/or BLEEDERS It will dump gallons of 180 deg water everywhere and depending where your auto feed is could be letting the boiler attempt to make steam.
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Old 04-14-2009, 10:24 AM   #15
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Bleeding heater expansion tank


So, I thought I'd post an update. I checked the auto feed and PVR, all checked fine. After the initial 3 inches of water after draining the entire tank, nothing more has come out, it's been 2 full days, and everything is bone dry. I can't explain why it initially leaked after the full tank drain then stopped and has not leaked since, but it did force me to check out the other componants to find thay were operating as they should. Thanks to all for your help, I'll keep you posted if something should change.

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