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7. Disconnect the LH electrical plug from the bottom valve. 8. Turn the boiler on and set the low pressure to the value given in Table 1, using the low rate adjustment screw inside the spindle of the top valve. 9. Turn the appliance off and reconnect all the electrical plugs. Do not overtighten the electrical plug fixing screws. 10. Refit both dust covers over the adjustment screws and refit the pressure test point screw. 11. Check for gas soundness. INSTALLATION INSTALLATION Concord CXSi/H - Installation & Servicing 23 SETTING THE HIGH BURNER PRESSURE 1. Turn the boiler thermostat knob to OFF. 2. Undo the screws holding the electrical plug on the bottom gas valve and pull it off. 3. Turn the boiler on and remove the plastic dust cover from the adjustment screw on the top gas valve and, using a suitable spanner, screw the adjuster gently fully in. Then screw the adjuster out until the burner pressure is approximately 9.0 mbar. 4. Turn the boiler off and refit the electrical plug on the bottom valve. 5. Turn the boiler on and remove the dust cover from the adjustment screw in the bottom valve. Set the burner pressure to the value in Table 1. 6. After setting, allow the boiler to operate for 3 minutes to stabilise then recheck the setting. 22 MANIFOLD GAS PRESSURE - CXSi 180/H ONLY Inlet PTP Dust cover Con 6023 5 Remove plastic dust cover Con 6024 3 Low rate adjustment screw Gas rate adjuster maximum High solenoid plug The manifold setting pressure must now be checked and adjusted as necessary. It is essential to set the High Pressure first Start the adjustment procedure with the system cold, on full load and with all temperature controls set to maximum to avoid thermostatic shutdown. Remove the screw in the burner setting pressure test point and connect a suitable gas pressure gauge. Turn on the electrical supply to light the boiler and let it operate for about 10 minutes to stabilise the burners. Check the pressure and if it differs noticeably from that given in Table 1 for the appropriate boiler size adjust it as follows: SETTING THE LOW BURNER PRESSURE 7. Turn the boiler thermostat knob to OFF. 8. Disconnect the ’high’ solenoid plug from the top valve. 9. Disconnect the electrical plug from the bottom and middle valves. 10. Turn the boiler on and set the low pressure to the value given in Table 1, using the low rate adjustment screw inside the spindle of the top valve. 11. Turn the appliance off and reconnect all the electrical plugs. 12. Refit both dust covers over the adjustment screws and refit the pressure test point screw. 13. Check for gas soundness IMPORTANT. Do not adjust the middle valve, which is factory set. INSTALLATION SERVICING INSTALLATION 23 SPILLAGE CHECK 24 TESTING Check the main burner responds correctly to manual on/off operations of any controls fitted in Check that there is no spillage the gas control circuit. of combustion products from Check the operation of the flame failure safety system by lighting the boiler and then turning the boiler draught diverter by the gas inlet cock off. carrying out a spillage test, as The Burner On light will go out and the controls will try to relight the boiler. After a period of detailed in BS. 5440:1. about 5 seconds, the Lockout light will be illuminated. Turn on the gas cock again and press in and release the Lockout button. The boiler will relight. Complete the Commissioning section of the boiler log book. Important Commissioning / Operating Instructions: Do not operate this appliance for long periods or take any combustion readings with the casing or any part of the casing removed. 25 ADJUSTMENT OF WATER FLOW RATE THROUGH THE BOILER When commissioning the heating/domestic hot water system the shunt pump must be adjusted to give the minimum flow rate given in Table 4, when that part of the system intended to be used for dissipation of residual heat only is in operation. 26 HANDING OVER ROUTINE OPERATION Hand over these, the User.s Instructions and the Commissioning & Servicing Log Book to the customer and request him to keep them in Full instructions covering routine lighting and operation of a safe place for ready reference. the boiler are given on the Lighting and Operation IMPORTANT. Point out to the owner that the boiler must have Instruction Label located on the inside of the casing door. regular maintenance and cleaning, at least annually, in order to ensure reliable and efficient operation. Regular attention will also Draw the attention of the boiler owner or their prolong the life of the boiler and should preferably be performed at representative to the Lighting and Operating Instruction the end of the heating season. Label on the inside of the front panel. Give a practical demonstration of the lighting and shutting down of the After servicing, complete the service section of the log book and boiler. return it to the owner or their representative. Describe the function of the boiler and system controls and Recommend that a contract for ...

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