Ambirad COBRA CB40 Manuel d'installation, d'utilisation, de maintenance et d'entretien - Page 11

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Combustion fan
To remove the combustion fan
disconnect the electrical connection from
the burner/control assembly and remove
the fan securing screws to the side of the
burner box.
Figure 14
Figure 15
Remove fan spigot by removing the three
retaining screws.
Inspect the fan impeller and remove any
dust by brushing with a soft brush.
Similarly remove any dust from the finger
guard covering the secondary (cooling)
impeller and the mesh aperture in the
motor cover. Ensure that the impeller
turns freely and that there is no excessive
play in the bearings.
Figure 16
Emitter tube inspection
Brush away any dust on the exterior of the
emitter tubes.
Remove the heat exchanger by slackening
pinch bolts disconnect flue and fresh air
inlet where necessary.
Through the two holes view down the tubes
and if carbon deposits are evident clean
with a suitable rod.
R e f l e c t o r
It is recommended that the reflector is
cleared of any dust annually and or before
the start of each heating season.
The reflector can be cleaned with a soft
cloth and detergent in water. A mild non
abrasive metal polish may be used in cases
of extreme discolouration. Dirty reflectors
will increase the heat radiation upwards into
the roof space by 3-4%.
Sweeping of flue
As a part of the annual service of type B
appliances the flue should be periodically
swept inaccordance with the regulations of
the country that the appliance is installed.
For servicing of injector, electrode
a s s e m b l y, refer to Section 13.

14 Herringbone adjustment

Gain access to the burner/flue
compartment, attach the orange flexible
pipe to the flue outlet (See figure 17) with
the pipe clamp provided.
Figure 17
Connect the damper to the opposite end of
the orange flexible pipe, attach with the
pipe clamp.
Connect a 4" flue pipe to the damper (not
supplied) to the herringbone system.
Connect the flexible pipe from the air return
on heat exchanger to the burner inlet,
secure with pipe clamps. See figures 18 and
1 9 .
Figure 18
Figure 19
Connecting to a herringbone
adjustment
Disconnect the electric supply, gain
access to the burner, see section(s) 10
to 12
Figure 20
Locate pressure test tee piece, remove
the black sealing cap. See figure 20.
Attach the manometer. See figure 21.
Figure 21
Loosen the damper plate locking, grub
the screw, slide the damper plate to
approximately half way.
Follow commissioning procecure, allow
heater to fire for approximately 30
minutes. Set damper plate to give a hot
pressure as indicated below. Check gas
burner pressure. To gain access to gas
pressure adjustment see section 12
Damper setting Hot
Burner Gas Pressure
1.2mb
Turn off electrical supply, remove
manometer, refit sealing cap.
10.5mb
9