Cuenod C 285 Operating Instructions Manual page 8

Start-up
Checking and adjustments
Combustion implements and secondary air
8
Natural gases -low NOx
secondary
air
maxi
T1 Y=453
T2 Y=753
Bold : factory settings
Natural gases & propane
secondary
air
maxi
T1 Y=453
T2 Y=753
Bold : factory settings
Checking and setting combustion
Burner is supplied already set for natural
gas.
• Remove the safety screw D.
• Remove the movable pin E.
• Open the body of the burner.
• Disconnect the two ignition cables on
the transformer and the ionization
sensor cable.
• Unscrew the nut and the lateral screw
C which immobilise the gas supply
line.
• Withdraw the combustion
components.
• Check the settings :
of the ignition electrodes, the
ionisation sensor, and of the diffusors
according to the gas available and the
accompanying diagrams.
• Check to ensure the presence and the
correct positioning of the sheet gasket
on the gas supply line.
• Re-assemble.
• Check :
- the tightness of the screw and the
nut C,
- subsequently for leaks.
05/2008 - Art. Nr. 13 013 503D
Secondary air (dimension Y)
This is the amount of air flowing between
the tubulators diameter and blast-tube.
On delivery, dimension Y is set at 453 in
T1 and 753 in T2.
secondary
However,
air
mini
- this value can be adjusted according to
Y=478
the following :
Y=778
- gas firing quality (shock, vibration,
judder, time lag),
combustion quality for gas flows.
Setting
It is performed when burner is shutdown,
with removal of combustion implements,
following the procedure outlined in the
earlier section.
By increasing dimension Y, secondary
air reduces, the CO
versa.
• Loosen both screws from the
turbulator support.
• Slide the turbulator support into the
secondary
required direction.
air
mini • Measure dimension Y; tighten both
Y=478
screws.
Y=778
• Adjust the diffuser according to the
type of head and gas used following
the enclosed plan.
• Reassemble the whole unit.
• Make sure the flat gasket is available
and in position on the gas inlet line.
increases and vice
2