Doesn't the genset require liquid LP? Also I thought I read in the OM that the genset and appliances should be on separate lines as flame-outs can occur when genset demand draws pressure away from the appliances? And finally is the single stage PR normal for the genset? I read in the OM that is was suppose to be a 2-stage PR.

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"Don't know what this is for" looks like a shutoff valve for that branch.

I don't see how shutoff would work. I don't see any way to attach a handle or knob.