66
13.4
Maintenance of the combustion control
system
13.4.1
Flame sensor
The flame/ionization sensor has an important function in the boiler
ignition phase and in the maintenance of proper combustion; If
replaced ensure that it is correctly positioned and strictly observe
the reference shown in the figure below.
5/16” +/-1/32” (8mm +/-1mm)
flame
ignition electrode
flame sensor
electrode/ionization
sensor
5/16” +/-1/32” (8mm +/-1mm)
9
WARNING:
do not clean the electrode with sandpaper.
MANDATORY:
in order to prevent potential malfunctions, during
annual maintenance, check the flame sensor for deterioration
and, at the slightest sign of deterioration, replace it.
R
egardless of deterioration, replace it as indicated in the
paragraph
The geometry of the wire, the absence of alumina deposit, as
well as the quality of the insulation and of the gaskets must be
checked.
- Remove the electrode by unscrewing the two screws.
- Clean the gasket supporting surface.
- Reassemble the electrode by using a new gasket.
9
CAUTION:
take care not to damage the burner door insulation.
- Fix the electrode by screwing its screws with a torque wrench
at 2.5Nm.
- Check the position of the electrode against the burner, as well
as the distance of the flame sensor wires (refer to the picture).
- Adjust the electrode gap if necessary.
13.4.2
Gas valve
The gas valve is a safety and adjustment device which oversees
the correct operation of the product.
9
WARNING:
in order to maintain the technical characteristics
of the device and full efficiency, it is recommended to
replace it every 10 years
.
When replacing the gas valve, ensure the injector located at the
top of the gas valve being replaced is removed and correctly
inserted into the new gas valve.
Check that the O-ring on the injector is not worn or failed and, if
necessary, replace the injector.
Failure to do so may result in substantial property damage,
severe personal injury or death.
13.4.3 Burner
Check the condition of the burner, carefully clean it with a soft
brush if necessary. Do not use a brush with metallic bristles as
this may damage it.
If there is dirt remaining inside the burner, blow it out with
compressed air.
13.4.4
Burner door
MANDATORY:
check the insulation panel and, if it is worn or
condensate water has risen into the heat exchanger, it must be
replaced.
Material characteristics do not require individual protection
devices but, for safety, we recommend the use of a protective
mask, gloves and glasses.
9
WARNING:
the insulation panel is maintained by silicone
glue.
− Remove the electrodes.
− Remove the insulation by sliding under its periphery a thin
tool to loosen and remove it.
− Remove and clean the residues of the insulation and silicone
glue.
− Put two points of silicone temperature-resistant glue (Loctite
5366 or Ottoseal S17) on the plate of the door.
− Engage the insulation and place it in contact with the two
points of silicone glue.
− Make sure that the burner is in proper condition, remove any
possible insulation residue on the burner blowing them out
with compressed air.
−
MANDATORY:
replace the electrodes by using new gaskets.
−
MANDATORY:
check the burner door gasket and, if it is worn,
it must be replaced.
Regardless of deterioration, replace it
as indicated in the paragraph “13.3 Maintenance program”
.
−
MANDATORY:
check the high temperature glass braided rope
and, if it is worn, it must be replaced. The high temp braided
rope is maintained by silicone glue.
− Remove the braided rope by sliding a thin tool under it to
loosen and remove it.
9
CAUTION:
take care not to damage the burner door insulation.
− Remove and clean the residues of the braids and silicone
glue.
− Put a thin string of silicone temperature resistant glue (Loctite
5366, Ottoseal S17 or equivalent) in the seal housing.
− Engage the high temperature braided rope and place it in
contact of the glue and press the braids.
−
MANDATORY:
check the flame ignition electrode deterioration
and, if it is worn, replace it.
− The geometry of the wire, the absence of alumina deposit, as
well as the quality of the insulation and of the gaskets must
be checked.
− Remove the electrode by unscrewing the two screws.
− Clean the gasket supporting surface.
− Reassemble the electrode by using a new gasket.
9
CAUTION:
Take care not to damage the burner door insulation.
− Fix the electrode by screwing its screws with a torque wrench
Summary of Contents for Family PRO 42 IS
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