Yellow Heat Operation Manual
Copyright 2/21
Page 19
Homestead Inc.
TUNING
a.
Yellow Heat Burner is easily tuned and can produce a long-term, smokeless and stable
flame. Simple Rules:
Fire-box no more than 1/2 filled with flames.
Flame too big?
Adjust Flame Control Forward. Reduce pump speed control.
Flame too small?
Adjust Flame Control Rearward. Increase pump speed control.
CAD cell resistance should read no more than an average of 1,000 ohms on the Controller
during operation. A lower ohm value indicates a cleaner and more complete burn and brighter
resulting flames. When stable flame established, read average ohm meter value, rounded to
nearest 100. This establishes a baseline to compare to the daily meter readout. If the ohm
meter value rises more than 30% above the baseline, either the electrodes are starting to foul,
requiring the cleaning proceedure, or the oil being combusted is particularly wet. If the oil is
wet, a small percentage of petroleum fuel supplement, such as home heating oil or diesel fuel,
2 to 10% by volume, added to the imput screen often improves flame quality and reduces ohm
meter reading.
b.
To adjust flame size, loosen set screw on Flame Control, see Diagram, below. Set screw
should be loose enough for Flame Control to be easily adjustable. Loosen Knurled Ring
which should be only hand tight. Adjust Flame Control forward or back so fire is
appropriate size for heating appliance, as shown by color, smoke, heat output and other
indicators. If lowest adjustment produces a flame size larger or smaller than desired, the
Flame Control may be reversed for additional heat output range control. After proper
tuning is achieved, tighten Knurled Ring. Tighten set screw to save the burner position.
Image 5: Flame Control.
c.
There should be no visible emissions from the exhaust stack for the burner when in normal
operation and appropriate tuning. If excessive emissions are seen adjust Flame Control for
optimum performance. Smoke can be generated from either under- or over-firing. To
check which condition is causing smoke, shut-off burner control. If the flame persists for
more than 10 seconds, the smoke was caused by over-firing. After the flame is
extinguished, restart the burner as before, but adjust the Flame Control forward and follow
the tuning procedure. If the smoke is created because of under-firing, adjust the Flame
