Start Up; Preliminary Checks Settings - Cuenod NC9 GX207/8 Instrucciones De Montaje

Start up

Preliminary checks
Settings
Burner start up simultaneously involves
starting up the installation by the fitter
or his representative; only he can
guarantee compliance of the boiler
house with currently accepted practices
and the regulations in force.
The fitter must first have obtained a
"certificate of conformity" provided by
the certified authority or by the network
undertaker and have leak-tested and
drained the pipework upstream from
the ball valve.
Preliminary checks
· Check:
– voltage supply and compare it with
that prescribed
– polarity between phase and
neutral wire
– potential difference between earth
and neutral wire.
· Switch off electrical supply.
· Check there is no tension.
· Close the gas valve.
· Read the instructions provided by
the boiler manufacturer and that of
the heat controller.
· Check:
– that the type of gas and the
distribution pressure are
appropriate to the burner,
– that the combustion air supply to
the boiler-house and the exhaust
pipe for the products of
combustion are compatible with
burner and fuel capacity,
– that the flue functions correctly.
Leakage test
· Connect a pressure gauge to the
upstream pressure take-off 119
located on the valve assembly.
· Open the ball valve.
· Check the supply pressure.
· Use a purpose-designed foam to
check the external tightness of the
valve assembly connections.
No leaks should be observed.
· If necessary, drain the pipework
downstream from the ball valve.
· Reclose the drain valve and the ball
valve.
Air pressure switch F6
The air pressure switch is pre-set to
10 daPa. This setting enables the
burner to be started under any
circumstances. Screw V can be used to
make adjustments after having checked
flow-rate and combustion test.
6,5
25
06/2004 - Art.Nr. 13 011 288C
Settings
Combustion head:
The burner is delivered set for natural
gases (G20).
To have access to the firing head:
· Loosen the four screws 5 five turns.
· Work the board free and pull until
completely clear.
· Hang the board from the hanging
point 7.
· Loosen (clockwise) the locking nut
on the gas head.
· Loosen completely (counterclockwise)
the spherical head screw E.
· Remove the firing head.
· Check position of the ignition
electrode and position of the
ionization probe (see diagram).
When propane gas is to be used, the
GP diffusor on the board must be fitted
to the turbulator (see conversion).
· Reassemble the board, following the
disassembly sequence in reverse
order.
· When reassembling, check that the
O-ring J2 is present and correctly
positioned.
· Check for leaks after reassembly.
Combustion air:
· Set the flap opening with servomotor
Y10.
+ air = – CO and vice-versa
2
with no CO production
Secondary air:
Dimension Y governs the secondary air
between the turbulator and the blast
tube. Setting occurs by turning the
screw 15. Reading is by the vernier
graduated 0 to 35mm.
By increasing this value
(counter-clockwise):
CO rises and vice-versa,
–
2
nominal output decreases and
–
vice-versa,
start up is "harder" and vice-versa.
–
EN
43