Gas regulator

[larnot]

Got 5 rtu's on common gas supply, each has it's own regulator after shut-off valve, before gas valve.
My question is, do they have to be horizontally mounted, or will they work vertically as well?
Arrow is pointing in the right direction btw.

[ascj]

It depends on the regulator. Did you get some numbers off them?

[valdelocc]

they work either way, just make sure the arrow point to the right direction and depending where you are the vent must be protected from water/ice, check the codes.

[OuTcAsT]

Should work either position. As previously noted, make sure the arrow is pointed the right way ! Also, if mounted horizontally, be sure the vent is protected from water/ ice accumulation.

[ascj]

Not all regulators are mutli position. Most are, but for example.......

From Maxitrol, "The RV81, RV91, RV111, & RV131 are
recommended for normal horizontal position only."

[larnot]

This was an older Maxitrol #3253. Hopefully it's the same as RV53 and is multi position. Gas valve made a buzzing sound when I went to fire it up. Had 24v but wouldn't open.

[gasinside]

If this is an inside installation and the regulator has a vent limiter (looks like a brass plug on the top of the regulator) it must be mounted horizontally and the vent limiter must be pointing straight up.

[larnot]

It's outside on a roof. Vent plug looks like its the same as the rest of the housing.

[gasinside]

Then as long as the vent is protected from the elements your good to go. Have a great day.

[jnsrose]

It's outside on a roof. Vent plug looks like its the same as the rest of the housing.

You said vent plug on a roof. Is this a vent limiting device? If so , should not be on a roof top application. Vent should be vented to the atmosphere via piping or a special fitting that they sell. Vent limiters are not water or freeze proof. You can check this by removing it and seeing if it works.