Maintenance - Cuenod C 285 Operating Instructions Manual

Maintenance

Important
Maintenance operation should be
carried out regularly, at least once a year
and by qualified personnel.
• Cut off power at the multi pole switch.
• Make sure there is no current.
• Close the fuel intake.
• Check for leaks;
Setting values are those indicated in
section Start up.
Use only genuine manufacturer spare
parts.
Checking the combustion
components
• Remove the electric plugs and
pressure tapping on the gas train.
• Remove both fuel oil tubes and both
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
ligne.
• Take out the combustion components.
• Clean thoroughly.
• Check the condition and the settings :
of the baffle, the ignition electrodes,
the ionisation sensor, the diffusors,
the ignition cables and the ionization
cable.
• Change any defective parts.
• Check to ensure the presence and the
correct positioning of the sheet gasket
on the gas supply ligne.
• Re-assemble.
• Check the tightness of the screw and
the nut C.
18
Removing the blast-tube.
This operation requires :
- either the opening of the burner body
and the boiler door,
- or removal of the burner.
1) Access via boiler door: Proceed as
indicated at the start of the previous
paragraph, up to "Withdraw the
combustion components". Then...
• Unscrew the three blast-tube screws
from the inside.
• Change blast-tube.
• If necessary, fill space between the
quarl and blast-tube with refractory
material.
Do not block pressure take-off pF.
• Re-assemble.
2) Removing burner :
Proceed as indicated at the start of the
previous paragraph, up to
the combustion components". Then...
• Remove hoses, burner body, gas train
and combustion head.
• Unscrew the three blast-tube screws
from the inside.
• Change blast-tube and front seal.
• Re-assemble.
Cleaning air circuit
Depending on intensity and conditions
of operation of the burner :
• Clean the air stream circuit, the fan,
the flap and the burner body.
• Reassemble unit..
• Check the direction of rotation of the
ventilating motor.
Checking gas filter
The external or valve filter (integrated or
pocket) must be examined at least once
a year and filter element changed if
filthy.
• Remove cover screws.
• Remove filter element. Make sure no
dirt is left in its cover.
• Install a new, similar element.
• Replace seal, cover and screws.
• Open ball valve.
• Check tightness.
• Check combustion.
Leakage controller
• Remove leakage controller.
• Check or replace filter elements
located on pe and pa.
• Reassemble unit.
• Check working order and for any
possible leaks.
05/2008 - Art. Nr. 13 013 503D
Gas valves
These valves do not require any special
maintenance. The valves must not be
repaired. Defective valves must be
replaced by a qualified specialist, who
will then carry out new check-up for
leaks, correct running and combustion.
Checking connections
In the electric control cabinet, on the
connecting terminal block, the
servomotor, the motor-pump unit, the
ventilation motor
• Check that wiring is fully tight to all
terminals.
Note
• Check combustion under actual
operating conditions (doors closed,
"Withdraw etc), and absence of leaks in the
different systems.
• Carry out the safety checks.
• Note the results in the appropriate
documents.