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Servicing should only be performed by a Qualied Service Agent
INSTALLATION QUICK TIPS – SUF 300, 400, 500 GAS PRESSURE
ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 300, 400, 500
A minimum dynamic gas supply pressure of 5.2" w.c. (1.29 kPa) for Natural Gas and 11" w.c.
(2.74 kPa) for LP Gas is required before making any adjustment to the gas control pressure
regulator. Attempts to adjust the regulator during periods of low gas supply pressure could result in over
firing of the water heater when the gas supply pressure returns to normal.
Check gas line pressure with a manometer, adjust the gas supply line pressure Gas Pressure table on
page 4.
1. Check manifold pressure using a pressure gauge (manometer) connected to the manifold pressure
tap on the gas control valve. If full rate adjustment is required, remove cover screw from top of the
gas control valve. Using a small screwdriver, turn adjusting screw clockwise to increase or counter
clockwise to decrease gas pressure to obtain 4.0" w.c. (0.996 kPa) for Natural Gas and 10" w.c.
(2.49 kPa) for LP gas.
2. Cycle the burner on and off several times to check its operation.
3. Check the operation of the limit and operating controls.
4. Check the vent system seams and joints and ensure that there is no discharge of flue products into
the room.
5. Check the input rate as shown on page 6.
HIGH ALTITUDE ADJUSTMENT SUF 300, 400, 500
For high altitude adjustments, contact the help line on the front of the water heater or contact
help@statewaterheaters.com.