Gas fired igniter ZA0 / ZDA0
Installation and initial commissioning
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Status: 11-2018
6.4
Setting the required air volume
This may only be performed by trained personnel.
Required special tools:
Customarily available pressure gauge with a measurement
range of 0
– 200 mbar
REMARK!
The required air operating pressure depends -
among other things- on the desired gas operating
pressure.
The calculation formula outlined in step 1 refers to
a normal case, i.e. the gas operating pressure is
100 mbar above the combustion chamber back
pressure.
Any gas operating pressure deviating from this
standard case will require an adaptation of the air
operating pressure.
1.
Define the air operating pressure:
A air inlet pressure of 10 mbar plus another 10 mbar for every
m of tube length is required. A gas fired igniter with a tube
length of 5 m should therefore be supplied with
10 mbar + (5 x 10 mbar), i.e. 60 mbar in total (any
backpressures need to be taken into account).
Fig. 18: Air pressure test nipple
2.
Turn the Allen screw (size 2.5) in the centre of the air pressure
test nipple (1) 1
1
/
2
turns counter clockwise in order to open
the air pressure test nipple.
3.
Connect the pressure gauge to the air pressure test nipple (1).
4.
Open the air supply (only on initial commissioning).
5.
Reduce the air operating pressure / the air volume using the
air regulating sleeve to the length-dependent value, so at the
same time also compensating for any combustion chamber
back pressure.
6.
After measurement, remove the pressure gauge.
7.
Close the Allen screw.
REMARK!
In case of a varying combustion chamber back
pressure with fluctuations greater than 20 %,
integrate an air-side differential pressure regulator.
