Ambirad COBRA CB40 Manuale di installazione, funzionamento, manutenzione e assistenza - Pagina 10

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Slacken pressure test point screw nearest
the burner head and connect a 'U' tube
manometer to the pressure test nipple
located on the body of the gas valve. (See
figure 8).
Access to the pressure regulator adjustable
screw is via a hole in the side of the
burner box.
Figure 9
Replace mains input connector and start
the heater. Using a suitable screwdriver
adjust the pressure regulator if necessary
set pressure as stated on data label.
Switch off the heater by pulling out the
mains input connector. Disconnect 'U'
tube manometer and tighten screw in
pressure test nipple.
Check the operation of the flame safe
guard equipment as follows:
With the heater running normally, switch
off the gas supply at the appliance
isolating the valve. Check the operation of
the vacuum proving switch as follows;
With the heater running observe that the
'burner on' lamp extinguishes within one
second. After a purge period of
approximately 9 seconds the heater should
attempt to re-light and if the gas isolating
valve has been left off, lock out should
occur indicated by power light only being
illuminated and fan running.
Check the operation of the vacuum
proving switch as follows. With the heater
running normally pull out the three pin
fan connection plug, thus causing the fan
slow down and stop. Within 3 seconds
the burner should shut off.
Observe for at least 20 seconds that there
is not attempt to re-ignite , then replace
the three pin plug and observe that the
heater proceeds to ignite in the normal
way.
8
Hand the 'User Instructions' to the user
and explain how to operate the heater and
controls.
Leave the 'Installation and Servicing
Instructions' at the users meter or
preferably with the service / maintenance
engineer / manager for use on future
service calls.
Note Heaters have a tendency for the
tube and 'U' bend to glow. This is normal
and quite acceptable.
13Routine service
Frequency of servicing
The manufacturer recommends that to
ensure continued efficient and safe
operation of the Cobra it is recommended
that the heater is serviced regularly by a
competent person e.g every year in normal
working conditions but in exceptional
dusty or polluted conditions more
frequent servicing may be required. The
manufacturer offers a maintenance
service. Details are available on request.
Tools required for servicing
The tools required to carry out any
servicing of the Cobra range of heaters are
as follows; electrical screwdriver, 13mm
spanner, 10mm spanner, 8mm spanner,
cross head screwdriver, flat blade
screwdriver, adjustable spanner, pipe
wrench, soft bristle brush; and a soft cloth.
Health and safety
Isolate gas and electrical supplies before
carrying out any repair work. Always test
for gas soundness with a suitable leak
detection fluid.
To remove the burner assembly
proceed as follows;
Remove the fixing screws securing the
ball guard. (See section 10).
Figure 10
Drop down access door on front of heater
by releasing the quarter turn fixings.
Figure 11
Unplug the mains and fan leads from the
burner assembly. Disconnect wiring to
neon lamps. Disconnect the gas feed pipe
at the gas valve.
Figure 12
Slacken the pinch screws at the front of
the burner securing the burner to the
heater firing leg. Remove flexible
ducting to fan by slackening hose clamp.
Figure 13
Slide the burner assembly back towards
the front of the product until the
burner spigot disengages from the
firing tube. Slide the burner assembly
away from the product.