A Raypak 003903F Pilot Orifice regulates pilot gas flow to support stable ignition and dependable burner performance in the unit.
The pilot orifice meters the pilot gas flow so the burner can ignite reliably and maintain stable operation within the heating and cooling system. Its precise 0.020 opening is important because it controls fuel delivery accurately, supporting consistent flame characteristics and safe ignition performance.
The pilot orifice may be approaching failure if the HVAC system shows delayed ignition, an unstable pilot flame or intermittent burner operation. Common indicators include visible clogging or corrosion around the opening and you might notice dirt, moisture exposure or debris buildup that can restrict proper gas flow.
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