Horz gas furnace in the attic whats Wrong???

[Jason1]

Originally Posted by cbottger

What about the dirty leg lets hear it

Sorry to annoy you, but you asked what was wrong and I pointed out what I thought. So so far there are a few problems.

As far as the drip leg goes I would say, yes, it requires one.

[Charley L. Bottger]

Originally Posted by Jason1

Sorry to annoy you, but you asked what was wrong and I pointed out what I thought. So so far there are a few problems.

As far as the drip leg goes I would say, yes, it requires one.

Not annoyed just playing around went and fed and water the horses in the barn and picked the stalls thought you were reading the IRC

The reason I am picking on the dirty leg in this area we do not install dirty legs in any area that is prone to freezing temps. Attics or on outside package gas heat and cooling units, busted dirty legs far out weight any moisture that may enter the gas valve by a lack of a dirty leg.

This may well just be a local thing have never really taken the time to look in the IRC. Would be curious to know about other areas especially up north where it really gets cold.
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[dharris]

If its a new unit, most mfgs require a drip leg....no flex line installed

[Russel Ray]

Originally Posted by cbottger

The reason I am picking on the dirty leg in this area we do not install dirty legs in any area that is prone to freezing temps. Attics or on outside package gas heat and cooling units, busted dirty legs far out weight any moisture that may enter the gas valve by a lack of a dirty leg.

Huh? What do "dirty legs" have to do with moisture? I thought they were for sediment in the gas supply. There's moisture everywhere, so what would a "dirty leg" do?

Nonetheless, check with your local gas supply company. Here in San Diego they are not required.

[Charley L. Bottger]

Originally Posted by rray

Huh? What do "dirty legs" have to do with moisture? I thought they were for sediment in the gas supply. There's moisture everywhere, so what would a "dirty leg" do?

Nonetheless, check with your local gas supply company. Here in San Diego they are not required.

RR There is moisture/condensate that travels with the gas within the gas distribution system and dirty legs are more for trapping the moisture than any solids that might be in the line. Different gas suppliers have different amounts of moisture present. The dirty leg should be a normal part of the maintenance program for for areas that have high levels of moisture. These traps if you would should be checked for moisture and or cleaned every time the furnace is serviced. That is why the manual shut off valve is suppose to be in the line ahead of the dirty leg for easy service.

[Russel Ray]

Originally Posted by cbottger

RR There is moisture/condensate that travels with the gas within the gas distribution system and dirty legs are more for trapping the moisture than any solids that might be in the line.

That dirty leg must be absolutely huge to trap all that moisture. Can you post a picture of one and/or explain how it works? Thanks.

[Charley L. Bottger]

Originally Posted by rray

That dirty leg must be absolutely huge to trap all that moisture. Can you post a picture of one and/or explain how it works? Thanks.

RR we are not talking large volumes of water David Valley can probally just throw a PIc right up here. I don't have one readily available but all they are is a Tee in the supply line with the side take off pointing down with a 3 inch nipple installed with a cap on it to allow for any drainage removal. Water being heavier than gas will fall into this nipple thus not carried on into the gas valve.

[Russel Ray]

Originally Posted by cbottger

RR we are not talking large volumes of water David Valley can probally just throw a PIc right up here. I don't have one readily available but all they are is a Tee in the supply line with the side take off pointing down with a 3 inch nipple installed with a cap on it to allow for any drainage removal. Water being heavier than gas will fall into this nipple thus not carried on into the gas valve.

Sounds like you're describing a dirt leg, whose purpose is, indeed, to catch dirt, not moisture. I can't see the little bit of moisture that might be in gas doing much to a gas valve, especially when the relative humidity around that gas valve is usually in the 30% or higher range, except out in the desert, perhaps. Dirt, however, can clog the valve.

[Charley L. Bottger]

Originally Posted by rray

Sounds like you're describing a dirt leg, whose purpose is, indeed, to catch dirt, not moisture. I can't see the little bit of moisture that might be in gas doing much to a gas valve, especially when the relative humidity around that gas valve is usually in the 30% or higher range, except out in the desert, perhaps. Dirt, however, can clog the valve.

Dirt leg, drip leg all the same and yes RR after working on these system for as long as I have I can tell you that moisture is carried in the lines with the gas more so in the more humid areas yes, and yes if even though a small amount of moisture can and does cause havoc in control valves I have changed to many of them out that have the white powdery scale in the valves from excessive moisture.

[Russel Ray]

I suppose so. Never heard of moisture being the reason for a dirt leg, and I also used to work on the systems from Corpus Christi up to Houston and inward to Bryan/College station, Austin, and San Antonio. Nonetheless, I have a list of 27 WALK inspections I gots to go do, so ciao y'all.

[Charley L. Bottger]

Originally Posted by rray

I suppose so. Never heard of moisture being the reason for a dirt leg, and I also used to work on the systems from Corpus Christi up to Houston and inward to Bryan/College station, Austin, and San Antonio. Nonetheless, I have a list of 27 WALK inspections I gots to go do, so ciao y'all.

The term dirt has mis led many folks The real term Dirty leg is implying contamination I also have never observed real dirt in a gas system just rust, scale and other solids not dirt. Today is not a good day for walking anywhere unless you are a Duck here. See my post over on general discussions

[Jae Williams]

Charlie, just got back to this--you covered it well.

I don't see what's so hard for some to understand that a "drip-leg" or a "dirt-leg" is the same thing, depending on where one might be. Here, they're called drip-legs because we have a high degree of moisture in the system, and they are required by the PUCO.

About the amount of moisture--a drop of water less than the size of a pin head can cause severe problems in the gas valve. Better the moisture falls into the leg than going into the valve.

27 WALK inspections...wow!! I only got 6 "insurance pictures" to do. They go quickly most of the time...and now I have to leave.

[Greg Veal]

Charley

In our area, we can't run any kind of gas line under the appliance, as shown in your pic.
I'd have run the gasline up on the back side of the furnace, high enough to install a dripleg, and then turn it down through the upper knockout.
Also, even if Manuf's allow, local CI's will turn you down for installing furnace in contact with combustible wood platform. They want brick, block, sheetmetal drainpan, etc. insulating unit from wood. Upflow or Horizontal.
Vent looks Ok from here, if it's all B'vent.
Ci's would call us on the hanging Romex running to unit with no disconnect switch.
I think I see Ref.L/S, but I see no Aux.Drain Pan w/drainline or panswitch.
I assume the Plenums are lined since there is no visible insulation, and no Mastic on any joints. Must be a really tight fitting installation?

I don't like the installation though. When that Furnace is running, you know those BTU's will be dripping/falling out of the bottom of that unit.

[Charley L. Bottger]

Originally Posted by gveal

Charley

In our area, we can't run any kind of gas line under the appliance, as shown in your pic.
I'd have run the gasline up on the back side of the furnace, high enough to install a dripleg, and then turn it down through the upper knockout.
Also, even if Manuf's allow, local CI's will turn you down for installing furnace in contact with combustible wood platform. They want brick, block, sheetmetal drainpan, etc. insulating unit from wood. Upflow or Horizontal.
Vent looks Ok from here, if it's all B'vent.
Ci's would call us on the hanging Romex running to unit with no disconnect switch.
I think I see Ref.L/S, but I see no Aux.Drain Pan w/drainline or panswitch.
I assume the Plenums are lined since there is no visible insulation, and no Mastic on any joints. Must be a really tight fitting installation?

I don't like the installation though. When that Furnace is running, you know those BTU's will be dripping/falling out of the bottom of that unit.

Greg: We don't put drip legs on furnaces in attic installs here do to freeze potential.

The supply plenum is insulated to the inside and there was a safety pan not really visible in the pic for the A-coil with primary and secondary drains

That was not romax running to the unit a rubberized pigtail to an outlet.

No brick or cement runners for furnace to rest on here use wood runners all the time. C'I's here must not be as picky as yours
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