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2. With the burner running, use a 3/8 inch wrench to open the bleeder valve about one-half turn (Figure 24). Allow oil
to drain into the container until a steady, clear bubble free oil stream is noticed. Close the bleeder plug.
Note: If safety lockout occurs during burner operation, reset after one or two minutes.
3. Close the ignition device mounting plate, and tighten the hold down clip screw.
FINAL ADJUSTMENTS
Final adjustments should be made by the use of a combustion test kit. Run the piece of equipment for ten minutes to allow
for warm up, a smoke tester should be used to take a smoke reading. The smoke test should read no greater than #1
(Shell Bacharach scale), and less than a #1 smoke is desired. A new heating unit might require more time than this to
burn clean due to the oil film on the new heat exchanger surfaces. Take a CO
exhaust. Combustion readings must be taken ahead of draft control, if used. For best performance of the burner CO
measured in the exhaust should be between 10-12% for most applications, and CO should be minimized with a goal of
250 ppm or less. In no case should CO be above 400 ppm. The burner should be started and stopped several times to
assure good operation. Open ignition device mounting plate, unplug solenoid valve lead, and check the oil primary control
(if equipped) for normal operation see. Check operation of flow switch and thermostat. Check for oil leaks.
SETTING COMBUSTION EFFICIENCY
1. Fire burner, adjust interlocking air bands until smoke from the exhaust changes from black to clear and see
through.
2. Record CO
and smoke levels. If CO
2
repeat CO
and smoke test. Continue this adjustment until desired CO
2
stack temperature.
3. Check lighting with cold and hot chamber.
4. Lock all adjustment screws.
FINAL CHECKS
Be sure all screws are locked and the controls on heating unit are adjusted in accordance with the heater and control
manufacturer's instruction sheets.
Note: O
% should be over 3 %, and for CO emissions the lower the better, but typical applications for pressure washers
2
should be under 250 ppm.
Figure 24– Bleeder valve adjustment
Do not run fuel unit dry for more than two minutes or damage to the pump may result.
is low, close the air band by a 1/8 of an inch using a ruler or scale, and
2
and CO reading from the equipment
2
and smoke levels are obtained. Record
2
32
2
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