Assessments - 3, GPA: 4
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In the event of any difficulty in making suitable service arrangements, Worcester personnel will be happy to discuss regular servicing and offer a comprehensive maintenance contract. IMPORTANT: Do not touch or adjust any sealed compontent. WARNING If a gas leak exists, or is suspected, turn off the gas supply to the appliance at the service cock and consult your local service engineer. Do not touch any electrical switches to turn them either on or off. Open all windows and doors. Do not smoke. Extinguish all naked lights. CLEANING Do not use abrasive cleaners on the outer casing. Use a damp cloth and a little detergent. OPERATION OF CONTROLS OPERATING SWITCH In the ‘ ’ position there is no mains electricity to the appliance. In the ‘I’ position mains electricity is connected to the appliance. CENTRAL HEATING TEMPERATURE CONTROL The position of this knob will determine the temperature of the water delivered to the radiators between the ‘I’ and ‘MAX’ position. When the knob is turned anti-clockwise past the ‘I’ position towards the ‘ ’ (Summer Position), then the appliance will operate in the HOT WATER mode only and no heat will be delivered to the radiators. DOMESTIC HOT WATER TEMPERATURE CONTROL The position of this knob will determine the temperature of the water delivered at the domestic hot water taps between the ‘ ’ and the ‘MAX’ position. By slightly reducing the flow of domestic water from the tap, the delivery temperature of the water will be further increased. This is of particular advantage in the winter, for example to increase bath water temperature. Also this will provide an added advantage of reducing the delay before hot water is obtained. FACIA MOUNTED PROGRAMMER (if fitted) Your installer may have mounted either a mechanical or an electronic programmer into the facia of your appliance. Operating instructions are supplied with the programmer. RESET BUTTON Press this button in for five seconds if any of the indicator lights are flashing slowly. SYSTEM PRESSURE GAUGE The red needle has been set to show the sealed system pressure which is required for the appliance to operate effectively. The grey needle will show the actual pressure in the system. This does not apply to any open vent system. INDICATOR LIGHTS Mains electricity indicator: OFF : No mains electricity to the appliance ON : Mains electricity is connected to the appliance Central heating demand indicator: OFF : No demand for heat to the central heating circuit ON : Central heating demand FLASHING SLOW : Ignition lockout (once per second) FLASHING FAST : Appliance fault (other than ignition (five times per second) lockout) Domestic hot water demand indicator: OFF : No demand for domestic hot water ON : Domestic hot water demand FLASHING FAST : Air flow fault (RSF). Flue gas spillage (OF) (five times per second) Central heating and domestic hot water demand indicators: BOTH FLASHING SLOW : Overheat cut-off (once per second) Flame detection indicator: OFF : Burner off ON : Burner on Fig. 2. Controls. DHW demand indicator Central heating Flame detection Reset demand indicator indicator button Mains electricity indicator Operating CH temperature DHW temperature Sealed system pressure switch control knob control knob gauge TO LIGHT AND STOP THE APPLIANCE TO LIGHT THE APPLIANCE Check that the water valves to the central heating circuit are open. On sealed systems check that the grey needle on the pressure gauge is not below the required pressure. Switch on the mains electricity. The green power on indicator will light. Set the room thermostat, if fitted, to maximum. Turn the central heating temperature control knob to ‘MAX’. The red central heating demand indicator will light. The burner will light and the red flame detection indicator will light. Set the central heating and hot water temperature control knobs and the room thermostat, if fitted, to the desired temperature. TO STOP THE APPLIANCE For Short Periods Turn the central heating temperature control knob fully anti- clockwise to the ‘ ’ position. For Long Periods Turn the operating switch to the ‘ ’ position. Switch off the mains electricity. A facia mounted electronic programmer will retain its settings for about two weeks, after which it will return to the factory set programme. The display will disappear after approximately 12 hours. Fig. 3. CDi with front panel removed. Circulating pump Clip Locating peg Expansion vessel Gas valve A facia mounted mechanical programmer will require resetting once the operating switch has been set to ‘O’, or the mains supply has been disconnected. ELECTRICITY SUPPLY FAILURE If the electricity supply fails the appliance will not operate. Once the supply is restored the appliance will return to normal operation. If a programmer is fitted, check that the settings have been maintained. OVERHEAT CUT-OFF THERMOSTAT The appliance will enter a lockout condition in the event of overheating. An overheat cut-off thermostat is fitted to the appliance which will...
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