Operation; Burner Assembly - andrews HIflo EVO HF 30/300 Installation And Service Manual

5

Operation

5.1

Burner Assembly

Figure 10
Figure 11
Issue 4 21042918
The water heater gas/air mixture is adjusted at the factory
for the proper mixture for optimum combustion and ignition
for the type of gas listed on the rating label. The water
heater should operate properly without requiring
adjustment with the gas type shown on the rating label.
The following is a guide for the correct mixture
adjustment settings in case the gas content is different
from the rating label or ignition is not satisfactory. A
combustion analyser is necessary for making gas/air
mixture adjustments to determine the correct setting
The water heater can be converted from natural gas to LPG
with the use of a conversion kit available from Andrews
Water Heaters.
Do not attempt to adjust the venturi screws without a
properly calibrated CO²/CO combustion analyser. Making
the mixture richer without an analyser to monitor the
adjustments can result in dangerous levels of carbon
monoxide.
The venturi screw depth, when measured with a set of
callipers (see
13.5mm. The CO² range should be set as detailed in
Table 2
The CO content should be less than 50ppm.
If the CO² content is above the correct percentage, turn
the venturi screw (see
and recheck combustion. Repeat, if necessary, until the
correct reading is achieved. Turn the venturi screw
anticlockwise if the CO² reading is less than the stated figure
or the ignitions are not smooth and repeat as above at half
turn measurement intervals until correctly set.
For LPG adjustments please refer to the LPG conversion
instructions.
Adjust gas mixture by
turning venturi screw
Air/Gas mixture adjustment
), should be approximately 13.0 –
Figure 10
.
Figure 11
Note
If in doubt contact Andrews Water Heaters
), clockwise half a turn
22