Alpha CD50 - Routine Servicing

24
Fig. 27
To ensure efficient 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 per year
should be adequate.
It is the law that any service work must be carried out by a competent person, i.e. CORGI registered personnel.
Warning: Before servicing the boiler, isolate the electrical supply and close the boiler gas service cock. Allow the boiler to cool.
The data label is positioned on the inside of the left hand side panel.
Always test for gas soundness after servicing any gas carrying components.
Always carry out electrical system checks i.e. Earth Continuity, Resistance to Earth, Short Circuit and Polarity with a suitable
meter after servicing.
7.1 IMPORTANT NOTES PRIOR TO SERVICING
1. Check the flue terminal outside and ensure it is not blocked.
2. Run the boiler and check the operation of its controls.
3. Refer to Fig. 2 for location of flue sampling point.
4. Ensure that all system connections and fittings are sound. Remake any joints and check the tightness of any fittings that
may be leaking.
5. It is recommended that the operation of the heating pressure relief valve is checked by turning the head anti-clockwise
until it clicks. The click is the valve lifting off its seat allowing water to escape from the system - check that this is actually
happening.
6. Refill, vent and re-pressurise the system as necessary. (Refer to Commissioning, Section 5.1).
If the system pressure exceeds 2.5 bar when operating at maximum temperature, the central heating expansion vessel's
charge should be checked and re-pressurised, if necessary.
Note: Check the expansion vessel charge only when the system pressure is zero.
7. Check that the condensate trap drain pipe is connected and all joints are sound.
8. Inspect and clean, if required, the filter and cartridge in the pressure reducing valve and cartridge in the expansion relief
valve fitted to the store.
9. Check the operation of the expansion and temperature pressure relief valves by turning the head anti-clockwise until it
clicks. The click is the valve lifting off its seat allowing water to escape to the discharge pipe - check that this is happening
and that the valves are not leaking after they have been operated.
10. Check the charge in the domestic hot water expansion vessel and re-pressurise, if necessary.
Note: Only check the expansion vessel charge when the system pressure is zero.
11. Record details of the service in the Service Record Section on page 41.
Alpha CD50 - Routine Servicing
7 ROUTINE SERVICING
Room sealed
panel fixing
screws and
clips
Gas pipe
union
Pressure tube
connections
Fan assembly
fixing screws
Ignition generator
Fan
assembly
Combustion
chamber front
assembly
Viewing
window
Expansion vessel
support strap
Six nuts and
washers securing
combustion
chamber front
assembly