©
EUROHEAT
DISTRIBUTORS (H.B.S) LTD.April 2007
E&OE Instructions Part Number IN1190 Ed B
H11##0105A
24
Oil flow rate to low
If the oil flow rate is too low insufficient heat
will be produced to vaporise the oil entering the
burner, this will result in the fuel being burnt as
liquid which will wick from the bottom of the burner
creating smoke. The same symptom can occur
with excessive chimney draught at low fire as the
amount of air passing through the burner will cool
the burner preventing vaporisation of the fuel.
6” Burner
The6” burner is designed to operate at a very low
level. This results in a smaller flame in the burner
at low fire setting (no 1) than would be expected
in an 8” burner.
With the flue draught of 0.04” water gauge the
expected flame size should be as shown.
If the flame size is lower than shown smoke will
be the result.
Maximum flame size (no 6 setting)
The maximum flame size depending on the
chimney draught requirements should not touch
the top of the stove. The size of the flame depends
on the chimney draught produced. If insufficient
draught is created a tall long flame will occur. If
excessive the flame size will be small. A good
guide is that the flame should not pass higher than
the top of the glass door. If a poor flue draught
occurs the flame at maximum flow rate should be
adjusted to reduce the flow rate to gain a correct
maximum flame.
Solving Negative Pressure
Problems
What to do if the chimney draught is too
high at low fire.
There are two reasons chimney draught can be
high at low fire.
1. The chimney is susceptible to increases of
draught from external conditions such as wind.
If this is the case the flue termination position
must be examined to confirm it is correct and
a draught stabilizing cowl fitted (see chimney
cowl section).
2. Excessive negative pressure can occur with
chimneys over 20ft (6 meters).
There are two solutions to this problem.
1. A chimney choke plate can be fitted to
reduce the flue size so reducing the chimney
diameter and the draught (see Choke governing
plates).
2. Utilize the draught stabilizer at low setting to
reduce the chimney draught. This solution can
only be used if the higher heat settings of the
stove are unlikely to be required.
In this case adjust the draught stabilizer to
reduce the flue draught at setting 1 to 0.045”
water gauge. Turn the control knob to setting
6 maximum and reduce the high fire oil flow
setting to decrease the flame size until a clean
soot free flame is produced.
What to do if the chimney draught is too low
at high fire setting.
This problem will only normally occur with poor
flue construction or short chimneys, other than the
alterations listed above. The only solution to this is to
improve the chimney system or calibrate the high fire
oil flow to reduce the flame size.
High fire chimney draught adjusted.
Low fire chimney draught correctly adjusted
