Genesis II S-435 Propane to NG


 
MikD

MikD

New member
I recently acquired a Genesis II S-435 LP (~2020) model 62006001. I am going to convert it to NG to use with the 1/2" hook-up on our back patio. The hook-up has been hidden behind a deteriorating bench and we had completely forgotten it was there.
Also, I did read Chris' How To: Gas Conversion thread, so I know to skip the "conversion kits". ;)

If I have read the manuals and compared the NG (67006001) to LP models correctly, there are only a few gas parts that are different. The NG manifold assembly (67466) being the main part, but also the Valve/cup assembly for the side burner (67528), a NG hose and NG bulkhead assembly (66515). Does this sound correct?

For those of you using a NG hook-up, how do you tell if it will work with your grill?
Again, IF I have read the manual correctly, Weber states that the four burner grills are designed to operate at 4.5" of water column pressure (0.16245 psi). I know our plumber mentioned we had a 2 lb. system when they installed a tankless water heater a while back. But I don't really know if that helps with the grill setup.

Thanks!
 
You've done your research and your parts list looks correct to me barring any changes to your NG hook up you may need to make. Whether it will work right after you hook it up is just a guess on my part. Don't worry, others will chime in.
 
@LMichaels has some pretty good knowledge on the gas conversion process along with knowledge on the various NG pressures and what is necessary for running a grill. You can PM him or likely he will see this thread and chime in later today.
 
So, first off glad to see you not falling into the trap of the YouTube shysters or EBay shysters. You are going about it correctly. IIRC for some reason (likely only to confound the owner) Weber has different NG/LP burner part numbers. But to the best of my knowledge unless it's the "burner" itself housing the main gas orifice (which I highly doubt), burners are burners are burners. IOW they don't care what you feed them as long as it's the correct amount and pressure. That is the job of the valves, main metering orifices and regulator.
So, skip replacing burners as IIRC a couple other forum members here have done a simple manifold swap and they worked fine. And not to confuse things: Depending the type of valve(s) Weber installed at the factory SOMETIMES you can get away with a simple orifice swap along with the supply and regulator appropriate to the fuel. But, going the manifold route is the safest and surest way
As for your gas stub. Either buy a manometer (or NG pressure tester) like this https://www.amazon.com/UHARBOUR-Manometer-Pressure-Fitting-Connection/dp/B0CWNXQDB3?tag=tvwb-20 and place it on the stub. You should read somewhere between 6" to 8"WC pressure depending on where it's tapped, what is on the line before the tap, and what on the line is consuming fuel at that moment.
IIRC Weber specs a NG regulator on the grill. This is not so much to reduce pressure but to "regulate" highs and lows and keep the grill running consistently
 
Thank you for the replies. That is good to hear about the side burner as it will save some money that can go towards the manometer and probably a leak detector too, just in case.

Is it recommended to put a drop leg on the gas stub as well? I didn't see one under the house on the gas line anywhere. I know they did put one before the water heater though.

Also, the stub is fairly rusty now as is the cap currently on it. Is that a concern for leaks once the grill is hooked up?
I was thinking about using a scrub brush and try to clean off the rust and then shoot it with some black rust-oleum, but I didn't know if that would be a good idea or a recipe for disaster, lol.
 
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