16. GAS CONVERSION In
16. GAS CONVERSION In the event of converting to a gas type other than that for which the boiler has been designed, the parts delivered with the conversion kit must be fitted. 17. MAINTENANCE It is recommended that the following checks be made on the boiler at least once a year: 1 - Check the seals for the water connections; replacement of any faulty seals. 2 - Check the gas seals; replacement of any faulty gas seals. 3 - Visual check of the entire unit. 4 - Visual check of the combustion process and cleaning of the burners if needed. 5 - If called for by check no. 3, dismantling and cleaning of the combustion chamber. 6 - If called for by check no. 4, dismantling and cleaning of the injectors. 7 - Visual check of the primary heat exchanger: - check for overheating in the blade assembly; - clean the exhaust fan if needed. 8 - Adjustment of the flow rate of the gas: flow rate for lighting, partial load § and full load. 9 - Check of the heating safety systems: - safety device for maximum temperature; - safety device for maximum pressure. 10 - Check of the gas safety systems: - safety device for lack of gas or flame ionisation (detection electrode); - safety device for gas cock. 11 - Check of the electrical connection (make sure it complies with the instructions in the manual). 12 - Check of domestic hot water production efficiency (delivery rate and temperature) 13 - Check pressure in the Domestic Expansion Vessel and top up as necessary. 14 - Check manually by turning the test knob of the Temperature & Pressure Relief Valve. 15 - Check manually by turning the test knob the Expansion Relief Valve. 16 - Check discharge pipes from both the central heating and domestic hot water for obstructions. 17 - Check of the general performance of the unit. 18 - General check of the discharge/ventilation of the combustion by products. NOTE: THESE CHECKS ARE NOT EXHAUSTIVE 46
18. Servicing Instructions To ensure efficient safe operation, it is recommended that the boiler is serviced annually by a competent person. A Before starting any servicing work, ensure both the gas and electrical supplies to the boiler are isolated and the boiler is cool. Before and after servicing, a combustion analysis should be made via the flue sampling point (please refer to Section 15.8). After servicing, preliminary electrical system checks must be carried out to ensure electrical safety (i.e. polarity, earth continuity, resistance to earth and short circuit). 18.1 Replacement of Parts The life of individual components vary and they will need servicing or replacing as and when faults develop. The fault finding sequence chart in Section 19 will help to locate which component is the cause of any malfunction, and instructions for removal, inspection and replacement of the individual parts are given in the following pages. A Fig. 18.1 18.2 To Gain General Access All testing and maintenance operations on the boiler require the control panel to be lowered. This will also require the removal of the casing. 18.2.1 Removing the front panel 1. Remove the 4 retaining screws “A” (see Fig. 18.1); 2. Disengage the 2 clips (see Fig. 18.2); 3. Remove the front panel from the rest of the casing (see Fig. 18.3). 4. Reassemble in reverse order. Fig.18.2 Fig. 18.3 18.2.2 Removing the control panel 1. Remove the front panel as above; 2. Pull the control panel toward you to disengage it from the bottom of the chassis (see Fig. 18.4); 3. Clip the top of the control panel onto the bottom of the chassis. (see Fig. 18.5); 4. Reassemble in reverse order. Fig. 18.4 Fig. 18.5 47
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