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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 7 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
INSTALLATION QUICK TIPS - SUF 300, 400 GAS PRESSURE
ADJUSTMENT PROCEDURE:
GAS PRESSURE
SUF 300,400,
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.
1. Check gas line pressure with a manometer,
adjust the gas supply line pressure Gas Pressure
table on page 4.
2. 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. (2.49kPa) for LP gas.
3. Cycle the burner on and off several times to
check its operation.
4. Check the operation of the limit and operating
controls.
5. Check the vent system seams and joints and
ensure that there is no discharge of flue products
into the room.
6. Check the input rate as shown on page 5.
HIGH ALTITUDE ADJUSTMENT
SUF 300,400,
For high altitude adjustments, contact the
help line on the front of the water heater or
contact help@statewaterheaters.com .