Furnace Always Building Pressure

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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ODDSNENDS4U
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Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 6:56 pm

Hi,
I put a new pressure relief valve on my furnace and re bleed the system. Ever since then, my furnace is building pressure. I drain a little water and it goes back down. I did this about 5 times in 2 days Last year I put a new expansion tank on and a new boiler feedvalve. .
Any ideas on what my problem may be.
Thanks
Dennis

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Pa Dealer
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Posts: 244
Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Wed. Oct. 07, 2009 7:06 pm

DID YOU correctly drain the exp. tank?

R

ODDSNENDS4U
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Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 7:11 pm

No I did not drain the expansion tank. How do I do that?

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Pa Dealer
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Posts: 244
Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Wed. Oct. 07, 2009 7:20 pm

ODDSNENDS4U wrote:No I did not drain the expansion tank. How do I do that?


Depends, what type of exp. tank do you have?

R

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whistlenut
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Posts: 3549
Joined: Sat. Mar. 17, 2007 6:29 pm
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ & V-Wert
Hand Fed Coal Boiler: Franks,Itasca 415,Jensen, NYer 130,Van Wert
Hot Air Coal Stoker Furnace: Alaska, EFM, Keystoker, Yellow Flame
Hot Air Coal Stoker Stove: Alaska, Keystoker-2,Leisure Line
Hand Fed Coal Stove: Alaska, Gibraltar, Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Ford, Jensen, NYer, Van Wert,
Baseburners & Antiques: Glenwoods
Coal Size/Type: Barley, Buck, Rice ,Nut, Stove
Other Heating: Oil HWBB
Location: Central NH, Concord area

Post Wed. Oct. 07, 2009 7:24 pm

I am assuming that you have the older style expansion tank up between the joists, and not the newer rubber ballast type tanks that usually mount to the air scoop. If that is true, you shut off the expansion tank feed valve, and usually there is a bleeder valve hooked up to drain the tank. Sometimes it is a plug, sometimes a valve. There is pressure within, so don't do anything stupid.....hot or cold water comin' your way.

My pet peeve: You DO NOT have a furnace. You have a BOILER! Furnaces distribute warmed air, boiler distribute steam or heated water. I don't understand how the h..l folks get this confused, but many do. I'll stop ranting, all I really want to do is get you back operational.

Another thought is that you might have a pinhole leak in the HW coil. How high is the pressure going up to?
Obviously it isn't above 30 psi or the PRV would blow off.
If you can drain the pressure down to 15 psi, and have it stay there unless it rises when heated up, the problem sure seems like an expansion tank issue. Good luck, Mr BOILER man.

ODDSNENDS4U
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Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 7:25 pm

It is a Honeywell welded exp tank model tk300 60 butyl diaphram 7.4 cap precharge 12 psi
Thanks
den

ODDSNENDS4U
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Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 7:29 pm

LOL My boiler water water heater 520 efm has an expansion tank with a valve stem on the end

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Pa Dealer
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Posts: 244
Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Wed. Oct. 07, 2009 7:38 pm

Well, it doesn't sound like it is the expansion tank since it is a diaphram model. It could be what whistle nut said, a pin hole in the domestic coil. Is it a new boiler or an old boiler? You have to start troubleshooting somewhere. That new feeder valve you put on could be bad. Tonight, when everyone is done using domestic hot water, drain some water out of the boiler to a set point, say 15 pounds, and shut the valve off that supplies the domestic coil. If the pressure remains the same, the coil is the problem. If it goes up, it is probably a fill valve. Only two things put water in the boiler, the coil if it is bad or the fill valve if it is bad. Don't forget, the fill valves are adjustable.

R

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ODDSNENDS4U
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Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 7:39 pm

My PRV is letting off also and last I checked the pressure was at about 38 psi. So I drained a little water to bring it back down to 20 psi
Den

ODDSNENDS4U
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Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 8:11 pm

OK I drained it down to about 15 psi and I shut the valve that feeds the domestic hot water. Now I wait and see if the pressure stays the same or goes up?
Thanks
Den

ODDSNENDS4U
Member
Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 8:22 pm

Is it ok to leave that cold water valve closed all night?
Den :shock:

ODDSNENDS4U
Member
Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 8:54 pm

Hi,
With the cold water domestic feed valve closed, The pressure still went up!! Now is it the taco fill Valve?
Den

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whistlenut
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Posts: 3549
Joined: Sat. Mar. 17, 2007 6:29 pm
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ & V-Wert
Hand Fed Coal Boiler: Franks,Itasca 415,Jensen, NYer 130,Van Wert
Hot Air Coal Stoker Furnace: Alaska, EFM, Keystoker, Yellow Flame
Hot Air Coal Stoker Stove: Alaska, Keystoker-2,Leisure Line
Hand Fed Coal Stove: Alaska, Gibraltar, Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Ford, Jensen, NYer, Van Wert,
Baseburners & Antiques: Glenwoods
Coal Size/Type: Barley, Buck, Rice ,Nut, Stove
Other Heating: Oil HWBB
Location: Central NH, Concord area

Post Wed. Oct. 07, 2009 9:14 pm

Looking like the fill/backflow valves are not working correctly, or have some crap stuck under a seat allowing water to bypass the fill valve. If you are sure that the domestic water is off and a valve is not leaking by, then it has to be the fill valve area. Are the domestic hot water valves ball valves or stop and waste valves? (We hate stop and waste valves, you need full port valves or you compromise the flow dynamics). Glad you found that boiler, too! :roll: :idea:

ODDSNENDS4U
Member
Posts: 60
Joined: Wed. Oct. 07, 2009 6:51 pm
Stove/Furnace Make: efm
Stove/Furnace Model: 520
Location: Newtown PA Heating 5600 Sq. Ft. built in 1854

Post Wed. Oct. 07, 2009 9:29 pm

Hi,
It is a ball valve on the domestic feed. Do you think I should take the taco valve off and see if I can clean it?
Or just replace it? Are they expensive?
Den

User avatar
whistlenut
Member
Posts: 3549
Joined: Sat. Mar. 17, 2007 6:29 pm
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ & V-Wert
Hand Fed Coal Boiler: Franks,Itasca 415,Jensen, NYer 130,Van Wert
Hot Air Coal Stoker Furnace: Alaska, EFM, Keystoker, Yellow Flame
Hot Air Coal Stoker Stove: Alaska, Keystoker-2,Leisure Line
Hand Fed Coal Stove: Alaska, Gibraltar, Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Ford, Jensen, NYer, Van Wert,
Baseburners & Antiques: Glenwoods
Coal Size/Type: Barley, Buck, Rice ,Nut, Stove
Other Heating: Oil HWBB
Location: Central NH, Concord area

Post Wed. Oct. 07, 2009 9:41 pm

I'd try to clean it first. The fill valve alone is about 28.00. The fill and backflow is about 60. It could be just a piece of sand or rust.

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