Gas regulator - line or appliance type?

[Rob]

I'm adding a 60k btu unit heater (ceiling mount) to a detached workshop (w/ permit). It will be nat. gas and is a 2 psi system. The heater is the only gas appliance in the building. There will be a regulator (2psi to 7"wc) located about 2-3' from the heater (the regulator will be in the attic). Total pipe from from the riser to the regulator in the building is about 20 feet.

Should this regulator be a "line" or "appliance" type regulator, or does it matter? I'm looking at using either a Maxitrol 325-3L or

325-3.

Thanks, Rob

[Joe Bobst]

Why would you need a regulator since your NG company supplies one at the gas meter? In my experience, Modine and other unit heater suppliers that I have installed don't need extra gas regulation. Nor do gas furnaces. Maybe its the type of heater gas valve or something? Please enlighten as I may be behind the latest technology. ???

Joe

[Greg O]

Re-read his post, gas pressure is 2 PSI. He needs a regulator, a 325-3 should be fine. Latest technology? Not really! Many utilities supply the natural gas at 6-7 inches of water column to the home, often a utility will supply at 2 PSI, then regulators for the appliances are required. The utility in our area typically provides 2 PSI NG. Greg

[Zypher]

The unit heater should come with an appliance regulator.? No?

[Speedy Jim]

Modern gas valves come with an integral regulator. However, typically the regulator has a maximum inlet pressure rating of only 1/2 psi. In this case he does need an upstream regulator.

Jim

[Rob]

Yes, there is a regulator at the gas meter, but that brings the "street" pressure down to 2psi; from there it is distributed to the various appliances and further regulated to 7"wc. In my situation, a separate 2psi line (size 1") runs from the meter to the shop (about

100'). The heater needs an input of about 7"wc and thus the need for a 2psi to 7" reg. The heater does have an internal regulator but it only allows 7"wc input and brings the pressure down to about 3.5"wc for the burner.

Thanks for the replies. Rob