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Servicing should only be performed by a Qualied Service Agent
CONTROLS – GAS VALVE, ORIFICE CHART – SUF 500
The gas control valve has a built-in field adjustable pressure regulator. The regulator may be adjusted by
removing the cap screw marked “regulator”. The adjustment screw is underneath. The gas valve for the
SUF 500 Natural gas model is shown below. This is a 24V. solenoid operated gas valve.
For Series 100 and 101:
For Series 104:
ORIFICE CHART – SUF 500
Series 100/101 104
Natural .347" No Orifice
LP .241" .241"