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6. Commissioning & Testing cont.
Undo the gas pipe connection.
Remove the 6 manifold fixing screws.
Remove the manifold and injector assembly from
the right hand side of the heater.
Check that the manifold is straight, the injectors
are correctly aligned, and that they are clean,
and that there are no contaminants restricting the
orifices.
If
necessary
compressed air and or lint free cloth and
acetone.
Caution
The injector orifice is precision machined to
fine tolerances, do not clean with hard sharp
or abrasive instruments. If the injectors have
been removed from the manifold, when they
are replaced, and care should be taken not to
over tighten.
Ensure all joints are gas tight.
Fan and Motor
Check that the fan is secure and rotates freely
without excessive play in the shaft.
The fan blades and motor should be cleaned
using a soft brush.
The fan and motor assembly can be removed
from the heater by first disconnecting the leads
from the terminal block and by removing the
strain relief bush. The four screws securing the
fan and motor assembly to the rear of the
plenum can be removed, and the assembly
complete with guard can then be removed from
the heater.
Flue System
Check that the flue is in good condition, that it is
adequately
supported,
blockages or restrictions.
Check that any joints are properly sealed
preventing an escape of products of combustion.
Check condensate drain if fitted.
Check for signs of water ingress and any
resultant damage.
Flue Venter
Check that the flue fan is clean and free from any
dust deposits.
Differential Air Pressure Switch
Check that the tubes are connected and clear
and free from dust.
clean
carefully
with
that
there
are
no
29
Check that they are not kinked or damaged.
Check electrical connections are intact.
Test
Test and re-commission as per sections 6.3.0 to
6.3.4 inclusive.
Automatic Controls
Automatic control is by way of a Honeywell
controller.
Spark Ignition is via an ignition electrode ensure
that the ceramic insulation material is not
damaged or cracked.
Flame supervision is via a flame sensor rod.
Check the flame sensor rod for signs of
or corrosion, ensure that the ceramic insulation
material is not damaged or cracked. Check
connections are secure.
Main Governor
To adjust the main governor, using a screwdriver
remove the metal cover to reveal the adjustment
screw, and turn as follows :
Clockwise to increase pressure.
Anticlockwise to decrease pressure.
pitting
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