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The 24 hour plug in timer provided can be used to provide this function. The operation pressure will rise and fall in line with temperature increase and decrease of the heating system water temperature. This is normal operation. However should the pressure fall below that set on the pressure gauge (0.5 bar) this is an indication there is either a leak in the heating system or the expansion vessel is too small for the heating system volume. You should consult your Service Engineer in order to correct the fault. To shut off the boiler for short periods turn the thermostat switch to the off position. This will leave the pump circulating water around the heating system. To shut off the boiler for longer periods turn the boiler switch to the off position, this will switch the pump and the heating bulbs off, allowing the heating system to cool to ambient temperature. To shut off the boiler for extended periods whilst the house may be unoccupied when there is a possibility of frost turn the boiler switch to the off position and electrically isolate the boiler. Drain the heating system down. If a suitable anti freeze has been introduced into the heating system it may not be necessary to drain down. WARNING:- Do not switch on the appliance if there is a possibility that the water in the heater is frozen. Your installer will advise you about draining the system 7. Routine Servicing and Replacement of Parts As this is an electrical boiler there is no need for regular preventative maintenance, however at periodic intervals each of the bulbs should be checked for operation. Before commencing any service operation, ISOLATE the mains electrical supply to the boiler by switching off at the mains plug and removing the plug from the socket. Remove the boiler front cover by first unscrewing the two screws at the base of the boiler and rotating and lifting the cover off the boiler. After completing any service operation, refit the boiler cover and re commission the boiler as detailed in Section 5. Should the supply cord become damaged it must be replaced by a special cord assembly available from the manufacturer or its service agent. Page 7 of 13 Replacing a bulb • Remove the lid from the bulb box, remove the faulty bulb and replace with a new bulb. Do not touch the bulb with bare fingers, as this will reduce the life of the bulb. Use clean tissue paper or similar to hold the bulb. • Check that the bulb is seated correctly on the contacts. • Replace the top of the bulb box, locating it onto the pins provided. Replacing a bulb temperature limit thermostat • The bulb temperature limit thermostat can only be replaced as a complete lamp holder unit as follows. • Disconnect the power supply from the lamp holder at one side of the holder and the limit thermostat and withdraw the lamp holder from the lamp box. • Replace with a new lamp holder assembly, locating it onto the pins provided. • Ensure the wires are connected correctly. Replacing the control thermostat • Pull off the electrical connections from the thermostat body, noting the termination positions on the body. • Pull off the control knob from the spindle. • Remove the two fixing screws and lower the thermostat. • Withdraw the thermostat phial from the pocket located on the side of the boiler flow pipe. • Withdraw the thermostat and capillary from the boiler. • Replace in reverse order taking care to route the capillary away from any electrical connections and that the electrical connections to the thermostat body are arranged as the original. Replacing the overheat thermostat • Pull off the electrical connectors from the thermostat body. • Remove the locknut securing the thermostat body to the lower casing panel and lift the thermostat from its mounting position. • Remove the phial from the pocket on the side of the boiler flow pipe and withdraw the thermostat and capillary from the boiler. • Replace in reverse order taking care to route the capillary away from any electrical connections. Replacing the circulating pump • Isolate the pump using the valves at each side of the pump or the appliance isolation valves on the flow and return connections to the boiler. • Disconnect the plug and socket connection in the pump electrical supply. • Remove the pump from the pipe work. • Refit a replacement pump in reverse order ensuring it is pumping in the correct direction and the electrical wiring is correct. • Open the isolation valves, ensure the system cold fill pressure is correct, there are no water leaks and the system is correctly vented of all air. Page 8 of 13 Replacing the expansion vessel • Isolate the boiler using the appliance isolation valves on the flow and return connections to the boiler. • Remove the expansion vessel from the pipe work. • Refit a replacement expansion vessel in reverse order using a recognised method of sealing the threaded joint. • Open the isolation valves, ensure the system cold fill pressure is correct, there are no water leaks and the system i...

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