Ceiling mount heater

67Dart273 said

You can not simply adjust gas pressure, you must generally change the burner orifice(s) size(s) as well There should be a kit specifically for that from the manufacturer. Generally, it consists of a different spring or regulator top plate for the gas valve, and different orifices for the burner. There should be pressure readings on the heater nameplate

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Yes, I know...... This is a standard procedure when switching from gas to propane.
I've changed the orifices in the burner and also set the inlet and manifold pressures. Also don't forget that propane and natural gas are different settings so you'll need a manometer to set these. A pressure regulator is needed minimal 11 wc maximum is 14 wc. Manifold pressure needs to be 10wc for propane and 4wc for gas also depending on your altitude. And don't forget to change the gas valve spring along with the regulator adjuster screw with o ring.