Alpha Alpha CD50, User Instructions

Page: 3 / 9

2 Alpha CD50
1 DESCRIPTION
The Alpha CD50 is a wall mounted, high efficiency, fan assisted, room-sealed, condensing combination boiler - incorporating a
52 litre unvented hot water storage cylinder. It provides central heating and domestic hot water at mains pressure.
As supplied, the boiler is suitable for central heating systems requiring between 6.3 and 29.7 kW (21 500 and 101 430 Btu/h).
It 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.
2 USER CONTROLS
3 BOILER CONTROLS
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. 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. If lower temperatures are required, turn the thermostat anti-clockwise.
Note: It is recommended that the thermostat is always set between settings 7 and 9.
3. SELECTOR SWITCH
This control allows the boiler to provide central heating and hot water or hot water only. The '0' position will turn the boiler off.
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, ie red area, the system needs re-pressurising. Contact your Installer to have the
system checked and pressurised.
Fig. 1
Pull the control panel cover forward and down to gain access to the controls.