Relief Valve Piping? - Plumbing Zone

PLUMBER_BILL · 01-15-2010, 03:11 PM

GRANTED ... Codes require that relief valve discharge must not be trapped. IE: The closed post this A.M. by the HVAC Guy.

But are there any alternatives? Personally I would not want to be standing in line of the 3/8" hole.

eg.

Ron · 01-15-2010, 04:12 PM

Quote:

Originally Posted by PLUMBER_BILL

GRANTED ... Codes require that relief valve discharge must not be trapped. IE: The closed post this A.M. by the HVAC Guy.

But are there any alternatives? Personally I would not want to be standing in line of the 3/8" hole.

eg.

Not under UPC Code

TheMaster · 01-15-2010, 06:09 PM

Does the UPC require relief valves to be installed per the manufacturers instructions AND meet the UPC code? Both can be accomplished.

Ron · 01-15-2010, 06:55 PM

UPC says it has to be piped to the outside or to an indirect waste receptor.

TheMaster · 01-15-2010, 06:59 PM

Quote:

Originally Posted by Ron The Plumber

UPC says it has to be piped to the outside or to an indirect waste receptor.

So you can pipe it with anything you want..even pvc or any size?

Ron · 01-15-2010, 07:01 PM

Out of the pan PVC direct from water heater CPVC

TheMaster · 01-15-2010, 08:31 PM

Quote:

Originally Posted by Ron The Plumber

Out of the pan PVC direct from water heater CPVC

Ok sounds good. Try this next time you install one....hold open the relief valve for about 10 minutes and see if the pan will take it out as fast as it comes in. I assume your pan drain is 1" gravity and the discharge pipe is 3/4. I think they should go out independent but hey I dont write the code.

TheMaster · 01-15-2010, 08:42 PM

Heres how my code works. You can pipe a water heater pan in 1" but the relief line must go out independent. If you pipe the water heater pan drain with 1.5" pipe you can install a combo in the drain pan piping and dump the relief line down into it but it still cant dump directly into the pan itself.

ESPinc · 01-15-2010, 09:48 PM

Quote:

Originally Posted by Ron The Plumber

Out of the pan PVC direct from water heater CPVC

Here we have to use 1" cpvc for the pan drain,but most of our heaters are installed in the garage, so no pan is required as long as the garage is lower than the home floor elevation

Tankless · 01-15-2010, 11:14 PM

I do 1" PVC from the pan and 3/4 copper from the discharge to the exterior terminated between 6 & 24" above the grade. I don't know whatthe distance req's for the pan drain is. There may not be a tee - a valve of any kind and the ID may not get reduced. I also seem to remember that there may not be threads at the termination point of the relief line. OH..OH, the discharge line may not be located in an area where damage can occur should the valve release!

01-15-2010, 06:55 PM	#4
Ron Senior Member Join Date: Jun 2008 Posts: 8,746 My Photos	UPC says it has to be piped to the outside or to an indirect waste receptor. __________________ Stephen Hawking: If the government is covering up knowledge of Aliens, they are doing a better job of it then they do at anything else.

01-15-2010, 07:01 PM	#6
Ron Senior Member Join Date: Jun 2008 Posts: 8,746 My Photos	Out of the pan PVC direct from water heater CPVC __________________ Stephen Hawking: If the government is covering up knowledge of Aliens, they are doing a better job of it then they do at anything else.

01-15-2010, 11:14 PM	#10
Tankless Always Something Join Date: Jun 2008 Location: Santa Barbara / Ventura Posts: 1,348 My Photos	I do 1" PVC from the pan and 3/4 copper from the discharge to the exterior terminated between 6 & 24" above the grade. I don't know whatthe distance req's for the pan drain is. There may not be a tee - a valve of any kind and the ID may not get reduced. I also seem to remember that there may not be threads at the termination point of the relief line. OH..OH, the discharge line may not be located in an area where damage can occur should the valve release! __________________ "It's now. You just go for it now and you worry about the future and the past later." -Steve Nash And when I leave come together like butt cheeks -Grits n Gravy

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01-15-2010, 06:09 PM	#3
TheMaster Registered Member Join Date: Jun 2009 Posts: 6,437 My Photos	Does the UPC require relief valves to be installed per the manufacturers instructions AND meet the UPC code? Both can be accomplished.

01-15-2010, 08:42 PM	#8
TheMaster Registered Member Join Date: Jun 2009 Posts: 6,437 My Photos	Heres how my code works. You can pipe a water heater pan in 1" but the relief line must go out independent. If you pipe the water heater pan drain with 1.5" pipe you can install a combo in the drain pan piping and dump the relief line down into it but it still cant dump directly into the pan itself.