Published on August 25, 2014
2 Alpha CD50 1DESCRIPTION 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 availabl e whenever a hot tap is opened. 2USER CONTROLS 3BOILER CONTROLS 1.CENTRAL HEATING THERMOSTAT This thermostat controls the temperature of the water leaving the boiler for the heating system. For maximum efficiency from the boiler the thermostat should be left at number 5 or 6 as shown in Fig. 1. 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. 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 boile r 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 System Pressure Gauge Central HeatingThermostat Domestic Hot WaterThermostat Selector Switch Clock (if fitted) 0 Indicator Neons 1 2 3 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 bar 04 3 2 1 RESET A D B C SELECTORTHERMOSTATTHERMOSTAT OFF CD50 Pull the control panel cover forward and down to gain access to the controls.