A very old/unusual residence for Arizona:
The new Propane tank that was installed for our Dual-Fuel setup:
The outdoor unit runs just fine down to the point where we have it set to switch over to the gas furnace:
I checked this one out myself because my installers swore when they left it was running fine. The manufacturer supplies #56 steel orifices for LP at this elevation.
So where did these come from:
I said to the customer: "You know, these orifices aren't even available from my distributor, and they don't come with this unit. It's kind of odd that they're here..."
Customer: "Oh... well, I have this buddy who gave me some orifices..."
It turned out the "buddy" was the Propane guy. NOT a licensed HVAC contractor.
PS if you want to know the difference between 1.10 and #56, look here: