A.O. Smith 400A - Manual (Page 26)

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c. Remove the pressure regulator cover screw (Figure 16) and
adjust the pressure by turning the adjusting screw with a small
screwdriver. In this example, with heater running on natural
gas, do not exceed 4.0" (0.996 kPa) Water Column.
Clockwise to increase gas pressure and input rate.
Counterclockwise to decrease gas pressure and input rate.
d. “Clock” the meter as in step (b) above.
e. Repeat steps (c) and (d) until the specified input rate is
achieved.
f. Turn the manual gas valve to “OFF”. Replace the pressure
regulator cover screw. Remove the pressure gauge or
manometer from the manifold pressure tap. Replace the
set screw in the manifold pressure tap. If the gas pressure
regulator cannot be adjusted to give the full input rating with
sufficient gas pressure at the valve, check to ensure the
unit is equipped with the correct orifice.
LIGHTING AND OPERATION INSTRUCTIONS
A. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner.
Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
“WHAT TO DO IF YOU SMELL GAS”
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any telephone
in your building.
• Immediately call your gas supplier from a neighbor’s
IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY A FIRE OR EXPLOSION
MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
1. STOP! Read the safety information above on this
label.
2. Set thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition device which
automatically lights the burner. Do not try to light the
burner by hand.
5. Push in gas control knob slightly and turn clockwise
to “OFF”.
6. Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Follow “B” in the safety information
above on this label. If you don’t smell gas, go on to
the next step.
7. Turn gas control knob counterclockwise to “ON”.
8. Turn on all electric power to the appliance.
FOR YOUR SAFETY READ BEFORE OPERATING
OPERATING INSTRUCTIONS
WARNING
telephone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
C. Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in or
turn by hand, don’t try to repair it, call a qualified service
technician. Force or attempted repair may result in fire
or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to appliance if service is to be performed.
3. Push in gas control knob slightly and turn clockwise
to “OFF”. Do not force.
FOR YOUR SAFETY READ BEFORE OPERATING
9. Set thermostat to desired setting.
10. If the appliance will not operate, follow the instructions
“To Turn Off Gas To Appliance” and call your service
technician or gas supplier.