23
221680G
11.1 Servicing or Replacing Parts
To ensure the continued efficient and safe operation of the
boiler it is recommended that it is checked and serviced as
necessary at regular intervals.
The frequency of servicing will depend upon the particular
installation conditions and usage, but in general once a year
should be enough.
The servicing of this boiler must be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
NOTE: To obtain a products of combustion reading, remove
the screw from the analyser probe positioned on the top of the
boiler next to the flue elbow, see diagram 8.5. After use replace
the screw.
Typical values for this boiler at maximum domestic hot water
demand is:- CO
2
7.5% to 8.0% and CO 0.005% to 0.015%.
These are based on a 300mm length rear flue.
Make sure the appliance does not modulate whilst checking
combustion and allow the appliance to warm up for five minutes
before taking a reading.
Unless stated otherwise, parts removed or renewed during
servicing should be fitted in the reverse order to removal.
After completing any servicing, or renewing of gas carrying
components, ALWAYS test for gas soundness and carry out
functional checks of controls.
Dispose of all used sealing washers, gaskets and “O” rings
when renewing components.
Use the new ones supplied with the replacement.
11.2 Data Label
The data label is positioned on the front of the inner case cover.
11 General Data
11.3 Isolation of Boiler
Before starting any servicing or the replacement of parts, isolate
the boiler from the electrical supply at the external isolator.
When servicing or replacing any cold/hot water or heating system
components close all water cocks and drain appliance.
Close the gas service cock, see diagram 6.1.
BEFORE DRAINING THE BOILER, REFER TO SECTION 11.6.
11.4 Outer Case Front Removal
Remove the two nuts securing the outer case front then lift up
unhook the case at the top from the threaded lugs, pull it off on
one side to release then remove, see diagram 10.5.
11.5 Inner Case Front
Remove the inner case, secured by four screws, see diagram
8.1.
11.6 System Pressures and Draining
All parts containing water of the central heating circuit within the
boiler, are under the system pressure. Before any parts of this
circuit are disconnected, reduce the system pressure at the
external draining tap, turn the central heating isolating valves off,
and drain at the drain points on the appropriate valves, see
diagram 6.1.
All water containing parts of the domestic hot water circuit of the
boiler will be under the supply water pressure. Before any parts
of this circuit are disconnected, turn the domestic cold water
isolating valve off, open the hot water taps to reduce the water
pressure in the boiler and drain the boiler at the valves, see
diagram 6.1.
After replacing any water containing part of the central heating
circuit, make up the water loss, vent all air and pressurise the
system. Refer to “Commissioning” in the Installation Instructions.
Check for water soundness and that the safety valve seats
without leaking.
12 Servicing
12.1 Pilot Check
Check if the pilot flame is burning correctly and of the correct
size, see diagram 14.4. If the pilot flame is not correct, the pilot
injector will require removing when accessible.
12.2 Isolation and Access
Before starting, refer to Section 11.
Remove the fan from the flue collector, refer to Section 14.1
Remove the flue collector, secured with two screws.
Remove the main burner, refer to Section 14.2.
12.3 Cleaning the Heat Exchanger
Place a sheet of paper in the combustion chamber to cover the
injector and pilot assembly, to collect any debris.
Brush the heat exchanger.
Remove the paper together with any debris.
Do not use a brush with metal bristles.
12.4 Cleaning the Main Burner
Use a vacuum cleaner or suitable brush to clean the burner
thoroughly, making sure that all the burner ports are not
obstructed.
Do not use a brush with metal bristles.
12.5 Cleaning the Pilot Injector
If the pilot flame was not burning correctly, it is necessary to
remove the pilot injector, refer to Section 14.6.
Inspect the injector and clean if necessary, by blowing clear
only.
Do not use a wire or sharp instrument.
12.6 Service Checks
Inspect the pilot burner, spark electrode, adapter olive on the
pilot tube and thermocouple. Clean if necessary or renew, refer
to Section 14.4, 14.5 and 14.6.
Check the main injector, cleaning or renewing as necessary,
refer to Section 14.3.
Before replacing any parts removed during servicing, inspect
the condition of all seals and joints, renewing as necessary.
Check the condition of the combustion chamber insulation. If
renewing, refer to Section 14.20.
Check the spark gap, upon assembly, see diagram 14.4.
