04/2011 - Art. Nr. 4200 1037 0000A
32
hecking the mixing unit
• Remove the burner hood.
• Disconnect the ignition cable on the
transformer side.
• Loosen the three cover screws
W
.
• Remove the cover.
• Loosen lock nut
E
on the gas pipe
bracket
• Loosen the retaining bolt.
• Remove the mixing unit.
• Check the condition of the baffle plate.
• Check the position of the ignition
electrode and the ionisation sensor.
• When refitting, make sure that the
cable is routed correctly and that
O-ring
J2
is correctly seated.
• Check for leaks.
Cleaning the fan wheel
• Remove the equipment plate and
attach it in the service position (see
illustration).
• Remove and clean the fan wheel and
replace it if necessary. Reassemble in
the reverse order.
Fitting the fan wheel
When changing the motor or the fan
wheel, refer to the positioning diagram
opposite. The internal flange
A
of the fan
wheel must be aligned with plate
B
.
Insert a ruler between the vanes of the
fan wheel and bring
A
and
B
to the same
height. Tighten the cone-point screw on
the fan wheel.
Servicing
Maintenance
Burner and boiler servicing must only be
carried out by a professionally qualified
heating engineer. The system operator is
advised to take out a maintenance
contract to guarantee regular servicing.
Depending on the type of installation,
shorter maintenance intervals may be
necessary.
• Switch off the power supply before all
maintenance and cleaning work.
• Use original spare parts.
Work recommended as part of annual
burner maintenance:
- Burner test run, input measurement in
the boiler room
- Clean the combustion components
and replace defective parts if
necessary
- Clean the fan wheel and the blower
- Clean the gas filter; replace it if
necessary
- Visual inspection of the burner's
electrical components; eliminate
malfunctions if necessary
- Check burner start characteristics
- Leakage test
- Burner safety devices function check
(air pressure/gas pressure switches)
- Flame monitor and automatic
combustion control unit function check
- Commissioning the burner
- Check the gas flow
- Correct the adjustment values if
necessary
- Draw up a measurement report
General checks
- Emergency stop button function check
- Visual inspection of gas lines in the
boiler room
