Boiler Controls; Lighting Instructions; Boiler Operation; Important Notes - Alpha CD24C User Instructions

INDICATOR NEONS
When neons A (red), B (red), C
NEON INDICATOR
Continuous Flashing
D
C
-
-
B
- A and B
B
* Do not hold the selector switch in the reset position (3) for more than 2 to 3 seconds.

BOILER CONTROLS

1. CENTRAL HEATING THERMOSTAT
This thermostat controls the temperature of the water leaving
the boiler for the heating system. For maximum efficiency the
thermostat should be left at number 5 or 6. If lower heating
temperatures are required, turn the thermostat anti-clockwise. If
higher temperatures are required, turn the thermostat clockwise.
2. DOMESTIC HOT WATER THERMOSTAT
This thermostat controls the temperature of the domestic hot
water leaving the boiler. For maximum hot water temperatures the
thermostat should be left at maximum i.e. fully clockwise. If lower
temperatures are required, turn the thermostat anticlockwise.
3. SELECTOR SWITCH
This control allows the boiler to provide central heating and hot
water or hot water only.
Note: The internal clock and frost thermostat will not operate
when the switch is in the vertical position, i.e. 'Off' position (0).

4. PRESSURE GAUGE

This indicates the central heating system pressure. It should always
be within the green band when cold, increasing slightly when hot.
If the pressure falls below the green band, i.e. lower red area, refer
to the label on the inside of the hinged control panel cover for
guidance on re-pressurising the system. Or contact your Installer to
have the system checked and pressurised.
5. PRESSURE RELIEF VALVES
If the central heating or hot water system overheats and steam or
water is discharged from the pipe connected to the valve, turn the
boiler off and contact your Service Engineer. Your Installer should
have told you where this pipe terminates.
6. FROST THERMOSTAT
The boiler has a built-in frost thermostat, which automatically
operates the boiler if the water temperature falls below 4°C,
providing the electrical supply is on and the selector switch is set
to (1) or (2).
(yellow), D (green) are illuminated, the following conditions apply (see table below):-
CONDITION
-
Electricity supply to the boiler is on.
- Burner is alight.
A Temperature sensor fault. Contact your Service Engineer.
Overheat thermostat has operated. Rotate selector switch to the reset position (3)*. If this
B
continues to happen, contact your Service Engineer.
Burner has failed to light. Rotate selector switch to the reset position (3)* and the ignition sequence
-
will restart after a delay of about 30 seconds.
Flashing at the same time: Blocked flue or fan fault. Contact your Service Engineer
Flashing alternately: System pressure is very low and re-pressurisation is required.
A Pump fault or restricted flow.

LIGHTING INSTRUCTIONS

To turn the central heating off i.e. in Summer: Set the
selector switch to position (1).
To turn the boiler off for short periods: Set the selector switch
to position (1).
Note: In this position the pump will automatically operate
for 5 minutes in every 24 hours. If the water temperature falls
below 4°C the built-in frost thermostat will operate the boiler
automatically until the temperature of the water in the heating
system has been raised.

BOILER OPERATION

With the selector switch set to
only operate to provide domestic hot water, ideal for Summer use
when central heating is not required.
Setting the selector switch to
water) the boiler will operate to provide both central heating and
hot water.

IMPORTANT NOTES

1. CLEANING
Use only a damp cloth and mild detergent to clean the boiler outer
casing. Do not use abrasive cleaners.
2. SERVICING
To maintain efficient and safe operation of your boiler, routine
annual servicing is essential.
For advice on servicing contact:- The Alpha Helpline: 0870 3001964.
3 GAS LEAK
If a fault or gas leak is suspected, turn off the gas supply. Do not
touch any electrical switches, do not smoke and extinguish all
naked flames. Contact your local Gas Region immediately.
(hot water only) the boiler will
(central heating and hot