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Service Listed Alpha HE CB25 G.C. No. 47 532 25 Alpha HE CB33 G.C. No. 47 532 26 Alpha HE SY25 G.C. No. 41 532 07 For use with Natural Gas only Leave these instructions with the User 1 DESCRIPTION 1 DESCRIPTION The Alpha HE Range of boilers are wall mounted, fan assisted room-sealed boilers. The HE CB25 and HE CB33 are combination boilers providing both central heating and domestic hot water at mains pressure. The HE SY25 is a system boiler providing heating only for sealed central heating systems. The Alpha HE CB25 and HE SY25 boilers are suitable for central heating loads of between 14.5 and 25.0 kW (49 500 and 85 300 Btu/h). The Alpha HE CB33 boiler is suitable for central heating loads of between 19.7 and 33.2 kW (67 200 and 113 300 Btu/h). The boilers will provide central heating (as required) during the 'on' times set on your clock (if fitted). HE CB25/33 only -Hot water is always available whenever a hot tap is opened and takes priority over the central heating. The burner is lit electronically and the heat output is controlled by a modulating gas valve. 2 USER CONTROLS Pull the controls panel cover forward and down to gain access to the controls (if applicable). Fig. 1a - Alpha HE CB25/33 Fig. 1b - Alpha HE SY25 Alpha HE CB/SY 3 BOILER 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 turned fully clockwise i.e. maximum output. If lower heating temperatures are required, turn the thermostat anti-clockwise. 2. DOMESTIC HOT WATER THERMOSTAT - HE CB25/33 only 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 for guidance on re-pressurising the system. Or contact your Installer to have the system checked and pressurised. Note: The bleeding of radiators will cause the pressure to fall and the system will require re-pressurising after doing so. 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 - Burner is alight. B Flashing on and off - Temperature sensor fault, contact your Service Engineer. A Flashing on and off - Overheat or flue thermostat has operated. Rotate selector switch to the reset position (3) to reset. If this continues to happen, contact your Service Engineer. A Illuminated continuously - 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. A and B Flashing on and off at the same time - Blocked flue or fan fault, contact your Service Engineer. A and B Flashing on and off alternately - System pressure is very low and re-pressurisation is required. A Illuminated continuously and B flashing - Pump fault or restricted flow. 6. OVERHEAT THERMOSTAT This thermostat automatically switches the boiler off in the unlikely event of the boiler overheating. When the thermostat operates, the red neon (A) flashes on and off. Rotate the selector switch to the reset position (3) and the boiler will relight. If this continually happens, contact your Service Engineer. 7. PRESSURE RELIEF VALVE If the central heating system overheats and steam or water is discharged from the pipe connected to this valve, turn the boiler off and contact your Service Engineer. Your Installer should have shown you where this pipe terminates, usually outside your dwelling. 8. FROST THERMOSTAT The boiler has a built-in frost thermostat, which automatically operates the boiler if the water temperature falls below 8°C, providing the electrical supply is on and the selector switch is set to position (1) or position (2). Alpha HE CB/SY 4 LIGHTING INSTRUCTIONS 4 LIGHTING INSTRUCTIONS Refer to Fig. 1a or 1b for boiler controls. 1. Ensure the following:a. Electrical supply to the boiler is off. b. All heating controls and thermostats are set to OFF or minimum position. c. All isolation valves at the bottom of the boiler are in the open position (slot on the spindle in line with the valves i.e. ). d. The gas and water supplies are on at the mains. e. The heating system pressure is within the gr...
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