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Due to variations in nozzle tolerances, fuel quality, and geographical location, adjustments may be required
periodically to maintain optimal operation.
FLAME ADJUSTMENT:
TO ADJUST THE FLAME:
1. With the heater off, remove the burner cover and locate the fan-voltage regulator and white adjustment
screw on the top of the burner-blower housing. If adjustment of the blower-fan voltage is needed, gently
turn the screw with a small screwdriver to modulate the voltage. Use a voltage meter at the VDC terminals
of the voltage regulator to measure the voltage supplied to the blower fan. Do not exceed 13 VDC.
2. Start the unit and watch it 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 voltage regulator to the minimum setting (~10 VDC) 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 increase the voltage to increase the air supply, 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 voltage is set to minimum (~10 VDC), or approaches 13VDC, but will not bring the flame into
adjustment (especially after changing the nozzle), the fuel pump may need to be adjusted. Return the
voltage regulator to the minimum setting. Then, use a screwdriver (hex key on some models) to slowly
adjust the pump-flow-rate screw (near the pump intake). 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 voltage regulator 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.
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 components described in the instructions during this procedure. Securely
reattach the burner cover before resuming normal operation.
Whenever operating conditions change substantially (i.e.: temperature, altitude, fuel mixture),
check the flame and adjust it if needed.
FOR THE SF-80:
ADJUST VOLTAGE
DC VOLTAGE TERMINALS
-VDC
+VDC
DANGER:
120 VAC present
when heater is
running!
Maintenance & Service:
DANGER
!
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