Gas Pressure Regulators — Supplimental Information

I received a comment on the last post and the point he made is important to understand. The comment was: “What you forgot was the types of regulators, pilot bleed and 100% lock up. A lot of times a contractor replaces an old unit but leaves the regulator. If the old unit had a pilot –like on a unit heater, the regulator will cause intermittent problems.  Also, due to the new unit being 100% shut off, the regulator tends to try to bleed and over pressurizes the gas valve.”

Old regulators that were used on units with standing pilots,  those regulators are not suitable for dead-end lockup service. They are capable of controlling pressure at very low flows such as standing pilots, but should not be used as a line gas pressure regulator for appliances equipped with electronic ignition unless automatic control valve can open against line pressure.. Since most valves cannot open against more than 12 IWC, these regulators will cause problems and lock-outs.

It is also important to know that regulator have temperature ratings just as gas valves do for roof top unit applications.  You must use a regulator that is capable of operating down to -40 F if exposing them to the weather on a roof.

Thanks for the comment and for the suggestion about clarifying that there are different types of gas pressure regulators.  Hopefully , this additional information will help solve some problems on jobs.


About yorkcentraltechtalk

I have been in the HVAC industry most of my life. I worked 25 years for contractors on anything from residential to large commercial boilers and power burners. For the past 23+ years I had been employed by York International UPG Division ( a division of Johnson Controls) as a Technical support/Service Manager but I am now retired. One of my goals has always been to "educate" dealers and contractors. The reason for starting this blog was to share some knowledge, thoughts, ideas, etc with anyone who takes the time to read it. The contents of this blog are my own opinions, thoughts, experiences and should not be construed as those of Johnson Controls York UPG in any way. I hope you find this a help. I always welcome comments and suggestions for postings and will do my best to address any thoughts, questions, or topics you may want to hear about. Thanks for taking the time to read my postings! Mike Bishop
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One Response to Gas Pressure Regulators — Supplimental Information

  1. mark buckley says:

    By the way i like the blog

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