Horizontal 3” Boiler Instructions v1.2
Copyright - Chiltern Model Steam Engines
Page 4.
The gas jet size installed in the carrier is No. 8.
The gas jet carrier is connected to a gas source, canister or tank, using the ¼” x 40tpi ME union nut.
The optional Gas Canister Regulator/Pipe is connected to the jet carrier via the supplied adapter.
Use plumbers PTFE tape on the threads to ensure a good seal.
Before use always check the gas pipe is securely attached to the carrier and the gas source.
The flame intensity coming from the ceramic burner can be adjusted by moving the gas jet carrier in
and out of the burner mixer tube – a hot flame is blue and short, not long and yellow – see next
section.
In operation the burner sits under the cylinder body inserted via the open end support. The holes in
the burner mixer tube/gas jet carrier should sit just outside the open end support to ensure a free
flow of air, see attached photo.
No forced draft is required and indeed could have a detrimental effect on the burner/boiler.
Setting up the Burner
Setting up the burner is best done in subdued light so the flame can be easily seen. Put the burner
on a fireproof surface such as a baking tray.
Slide the gas jet carrier into the burner mixer tube so that approximately 12mm (1/2”) sticks out.
Lightly tighten the locking screw.
Turn on the gas and light the burner and allow it to run for 30 seconds noting how the flame looks.
Always turn off the gas and allow the burner to cool before handling or adjusting.
Slackening the locking screw and moving the jet carrier
into
the burner mixer tube will result in a
soft
yellow flame
which means the burner is running “rich”, that is there is not enough air in the gas/air
mixture. This should be the case initially as it is safest to tune the burner from “rich” to “lean” rather
than the other way around.