2
Alpha CB24/28
1. CENTRAL HEATING THERMOSTAT
This thermostat controls the temperature of the water leaving the boiler for the heating system. For maximum output from the
radiators the thermostat should be left at maximum i.e. fully clockwise. If lower heating temperatures are required, turn the thermostat
anti-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 anti-clockwise.
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
(not applicable for CB24X/28X) for guidance on re-pressurising the system. Or contact your Installer to have the system
checked and pressurised.
The Alpha Range of boilers are wall mounted, fan assisted room-sealed combination boilers, providing both central heating and
domestic hot water at mains pressure.
The Alpha CB24 and CB24X boilers are suitable for central heating loads of between 9.3 and 23.3 kW (31 700 and 79 500 Btu/h).
The Alpha CB28 and CB28X boilers are suitable for central heating loads of between 11.2 and 28 kW (38 200 and 95 500 Btu/h).
The boilers will provide central heating (as required) during the 'on' times set on your clock (if fitted). Hot water is always
available whenever a hot tap is opened and takes priority over the central heating.
The burner is lit electronically.
If applicable, pull the controls panel cover forward and down to gain access to the controls.
Fig. 1
3 BOILER CONTROLS
2 USER CONTROLS
1 DESCRIPTION
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