Hey bro just stumbled upon your channel. Just wondering how do you determine how much to derate? I’ve always just set gas valves at 3.5” wc and I also live in Calgary. You’re the only person I’ve seen say to set it at 3”
Most unit will actually have manifold pressure write on the nameplate. That nameplate normally includes derated manifold pressure too. A lot of the time you’ll see 0-2000ft 3.5” 2000-4500ft 3” above 4500ft derate 4% per every 1000ft above 4500ft.
Hey bro just stumbled upon your channel. Just wondering how do you determine how much to derate? I’ve always just set gas valves at 3.5” wc and I also live in Calgary. You’re the only person I’ve seen say to set it at 3”
Most unit will actually have manifold pressure write on the nameplate. That nameplate normally includes derated manifold pressure too.
A lot of the time you’ll see
0-2000ft 3.5”
2000-4500ft 3”
above 4500ft derate 4% per every 1000ft above 4500ft.