Gas Regulator Minimum Distance From Appliance
I am “involved” in a project that includes a gas-fired humidifier (Dristeem LX). The installation instructions state that the minimum distance between the regulator and inlet to the appliance is 5 feet. The regulator has been installed inches from the appliance inlet. The vendor has performed a “factory startup” and “approved” the installation. I’m looking for some real life examples of issues caused by this installation error. I recall having intermittent ignition issues with some Lochinvar Knights that ended up being related to regulators installed too close. Can anyone share similar experiences? I feel that I am justified in asking that the installer correct the error regardless of whether it was noted by the startup tech, but would prefer to also provide some potential risks associated with leaving it as is. Does anyone have anything to share? What is the theory behind this installation requirement?
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Big Ed, no plumbing inspector in this jurisdiction.
Found an article that says if lockup regulator is installed very close and gas valve in the appliance closes quickly, the regulator may respond too slowly allowing pressure increase above the regulator setting and trapping high pressure gas between the reg and gas valve.2 -
No plumbing inspector? How about a "code enforcement" official..does all trades? That's common in small municipalities. Mad Dog
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I've seen issues where the regulator can't respond fast enough when the valve opens or closes.
Another regulator issue that I come across is the regulator in the exhaust plume of the unit. It'll freeze up & stop flowing gas in cold weather.
That said, if it works and the location isn't bad, I'd probably roll with it.
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On some condensing boilers this will cause problems, I have no experience with a gas powered humidifier or how the gas valve works, I imagine it is similar thing though. You need a certain volume of gas on ignition for the flame sensor to correctly and reliably sense flame. I have had issues on a few mod/con boilers with this, usually it is someone thinking they are smart by running a reg right next to the unit so they can downsize their gas line so you get hit with a perfect combination of low gas volume on ignition. Intermittent flame failure was the symptom, it would sometimes happen several times in a row triggering a manual reset lockout of the control.
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Curious,
If that's true and you were limited on room could you use a much larger pipe in between the regulator and appliance instead? For example if it calls for 5 feet of 3/4 could you do a foot of 2" instead.
Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment1 -
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Thanks to everyone for the replies.
Regarding suggestions to reach out to code enforcement officials, without getting into too much detail, I am in the positions to more or less insist that the installation is corrected.
I also reviewed installation literature for the regulator itself, which requires a minimum distance of “3 to 10 feet depending on the application.”
EBEBRATT-Ed, I also found that this regulator can be ordered or retrofitted with an external control line, which is recommended if pipe size is increased by more than one pipe diameter at the regulator outlet.
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