I am sorry you have had a bad experience with servicing your furnace
. I am not sure you got the correct valve. It is my understanding that the valve in a Trillium
4500 is a 41-0640.
This is for both the 1300, (65810-2) and the 4500 (65512-2) version. The 1300 orifice is part number, 41-0450. The orifice for the 4500 version says NLA (no longer available). I am assuming that the orifice is in the burner, so not an issue.
This Robert Shaw valve claims to be the direct replacement for the 41-0640:
Robertshaw® 710-201 Unitrol Gas Valve 710 Series 7000SLC Right Valve® Equivalent
Well not exactly direct. The ports are in different places, so some tube bending would be required to install.
/ Outback replaced the valve on my first 4500, and did a bunch of other stuff, on my furnace
. But, since I have six Trilliums, (all will have a furnace) and at least one of my 4500's needs a new gas valve, I will also be attempting this procedure.