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FLAME ADJUSTMENT (CONT.):
TO ADJUST THE FLAME:
1. With the heater off, remove the burner cover and locate the air shutter and set screw on the side of the
burner-blower housing. If adjustment of the air shutter is needed, use a Phillips-head screwdriver to loosen
the set screw and rotate the shutter open or closed. Re-tighten the set screw to secure the air shutter in
its newly-adjusted position.
2. Start the unit and carefully watch the unit as it starts up. A small amount of white smoke at ignition is
normal, but should not last more than a few seconds and should not be black. If the unit will not establish
a flame, or the flame is very poor, set the air shutter to 50%-open and reattempt to start the unit. If the
unit still will not establish a flame, it may require service. (Refer to the Troubleshooting section)
3. When the heater has established a flame, slowly open the air shutter, if needed, until no flame or smoke
is emitted from the dome face. Allow the unit to run for 5 minutes, to warm up.
4. If the air shutter is set to 90% open or closed and will not bring the flame into adjustment (especially after
changing the nozzle), the fuel pump may need to be adjusted. Return the air shutter to 50% open. Then,
use a screwdriver (hex key on some models) to slowly adjust the pump-flow-rate screw (near the pump
intake) until the flame is adjusted. Counter-clockwise adjustment reduces fuel flow. Clockwise adjustment
increases fuel flow. Only minor adjustments of ~1/4-turn or less should be required.
5. When the heater is warm, the dome face should have an orange glow with no smoke or flame emitted.
If the dome face does not glow after the heater has warmed up, the flame is weak and needs less air or
more fuel. If the flame is smoky, it needs more air or less fuel. Use the air shutter and pump adjustment to
bring the warmed heater’s flame into adjustment.
6. When the flame is well adjusted, turn the heater off and let it complete its cooldown cycle. Then, restart
the heater and confirm the flame adjustment on startup. Repeat the process if necessary. Replace the
burner cover before resuming normal operation.
7. Inspect the flame regularly, when the heater is completely warm or is starting from completely cool, to
ensure that it is well adjusted.
ADJUST AIR SHUTTER
During this procedure, dangerous electrical voltage will be present at the wiring connections. Only
qualified technicians should perform this procedure. Use proper safety equipment and practices.
Only interact with the air shutter and set screw during this procedure. Securely reattach the
burner cover before resuming normal operation.
AIR SHUTTER SET SCREW
Whenever operating conditions change substantially (i.e.: temperature, altitude, fuel mixture),
check the flame and adjust it if needed.
FOR THE SF-120:
DANGER
!
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