Replaced an old Minimax Electronic Ignition NG heater (200K btu) with a Raypak Digital NG (266K btu)...but when this heater fires it it sounds like a haunted castle for a minute, low-level howling, whistling, wailing. Wonder if it's gas pressure issue? Have a AC-250 gas meter on house, maybe need to upgrade? Gas line piping is within specs for location/installation, flame color/pattern looks good when lit (based on what manual states) I guess I should bite the bullet and test static & load pressure with a manometer.
Any thoughts?
Any thoughts?