18
6.3
FROST THERMOSTAT
The boiler incorporates a built in frost thermostat which automatically turns on the boiler and pump if the water in the boiler falls
below 8°C, providing the electrical supply is on. The boiler will operate until the water temperature in the system reaches
approximately 40°C.
6.4
PUMP
If the electrical supply is on and the boiler has not operated for 24 hours for heating or hot water, the pump will operate
automatically for five minutes every 24 hours.
6.5
INDICATOR NEONS
When neon A (red) and neon B (yellow) are illuminated, the following conditions apply:-
Neon
B
Flashing very slowly (every 5 seconds) - Electricity supply to the boiler is on.
B
Illuminated continuously - Indicates the burner is alight.
B
Flashing on and off - Temperature sensor fault.
A
Flashing on and off - Overheat thermostat has operated. Rotate selector switch to the reset position (3) to reset.
A
Illuminated continuously - Burner has failed to light. Rotate the selector switch to the reset position (3) and the
ignition sequence will restart after a delay of about 30 seconds.
A and B Flashing on and off at the same time - Blocked flue or fan fault.
A and B Flashing on and off alternatively - System pressure is very low and re-pressurisation is required.
A Illuminated continuously and B flashing - Pump fault, restricted flow or DHW flow switch fault.
Alpha C23/27 - Boiler Operation/Routine Servicing
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.
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 safety valve is checked by turning the head anti-clockwise until it clicks. The
click is the safety 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 heating expansion vessel should be
checked and re-pressurised, if necessary.
Note: 1. Check the expansion vessel charge only when the system pressure is zero.
2. The expansion vessel pressure test point is accessible from the top and rear of the boiler.
7.
Record details of the service in the Service History section on page 34 of this manual and in the Benchmark Log Book.
7
ROUTINE SERVICING
Summary of Contents for Alpha C23
Page 27: ...27 9 1 ILLUSTRATED WIRING DIAGRAM Alpha C23 27 Wiring Diagrams 9 WIRING DIAGRAMS ...
Page 28: ...28 Alpha C23 27 Wiring Diagrams 9 2 FUNCTIONAL FLOW WIRING DIAGRAM ...
Page 30: ...30 Alpha C23 27 Fault Finding 10 3 DOMESTIC HOT WATER Follow operational sequence ...
Page 31: ...31 Alpha C23 27 Fault Finding 10 4 FAULT FINDING SOLUTIONS A to F ...
Page 32: ...32 Alpha C23 27 Fault Finding 10 5 FAULT FINDING SOLUTION SECTIONS G to L ...
Page 35: ...35 Alpha C23 27 ...
