The flame from the gas jet should be at least 10 to 12 inches long with natural gas, propane, LPG or butane. Basically
increase the pressure until the temperature of the oven rises steadily in increments of around about 1 degree every 20 to
30 seconds once past the 150 mark.. If the damper is correctly adjusted, so that heat is just on the threshold of escaping
from the tunnel mouth, but just not doing so, then the efficiency will be at a peak. To establish whether heat is escaping
from the tunnel mouth with wood is relatively easy, simply close the flue down until smoke escapes and then open it
just enough to eliminate the smoke leakage. With gas alone, hold your hand parallel to and just above the top of the
tunnel mouth, rising heat indicates that the flue is too closed, open it until the rising heat just stops. If the flue is open
too much temperature will be drawn from the oven and fuel consumption will be higher than necessary.
Butane burns at a much higher temperature than natural gas. Ensure that the oven is fitted with an angled oven burner
jet top so that the flame does not blast directly up into the oven wall. This will help to prevent undue heat stress of that
portion of the oven wall, although fine cracking in the vicinity of the burner jet is often inevitable in any event.
Although not essential, it is always recommended that at least 1 piece of timber be kept burning in the oven, even if it is
merely a glowing log in the corner. This enhances flavours, gives greater visual appeal and will assist in ensuring that
the oven floor is maintained at a constant temperature relative to the air temperature within the oven dome.
To increase the gas pressure there is a regulator adjustment within the multi control valve block. It is located under the
large silver screw at the top of the valve. Remove the large silver (5c piece sized) screw and open the pressure by
adjusting the little brass screw at the bottom of the shaft. Having adjusted the pressure there, you may need to adjust
the air/gas mix so as to maintain a clear, quiet blue flame. If the pressure cannot be raised sufficiently at that point, you
may need to adjust the supply pressure at the in-line regulator in the supply line. Remember that the valve operates
optimally at a maximum of 5.5 pressure. If pressure is adjusted to optimum and the temperature is still inadequate, then
it may be necessary to increase the size of the injector size. This is done by simply removing (unscrewing) the brass
injector nipple and drilling the injector out. Increase the size in 0.2mm to 0.5mm increments until the required flame
size is achieved.
Summary of Contents for Wood Fired Ovens
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