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Old 01-15-2010, 04:11 PM   #1
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Default Relief Valve Piping?

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.
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Old 01-15-2010, 05:12 PM   #2
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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
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Old 01-15-2010, 07:09 PM   #3
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Does the UPC require relief valves to be installed per the manufacturers instructions AND meet the UPC code? Both can be accomplished.
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Old 01-15-2010, 07:55 PM   #4
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UPC says it has to be piped to the outside or to an indirect waste receptor.
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Old 01-15-2010, 07:59 PM   #5
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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?
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Old 01-15-2010, 08:01 PM   #6
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Out of the pan PVC direct from water heater CPVC
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Old 01-15-2010, 09:31 PM   #7
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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.
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Old 01-15-2010, 09:42 PM   #8
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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.
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Old 01-15-2010, 10:48 PM   #9
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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
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Old 01-16-2010, 12:14 AM   #10
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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!
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