27Mexico Super FF4100 & FF4125 - Installation & ServicingINSTALLATION53 INITIAL LIGHTINGTO LIGHT THE BOILER1. Check that all the drain cocks are closed and any valves inthe flow and return are open.2. Check that the gas service cock (E) is OPEN and the boilermains on/off switch is OFF.3. Slacken the screw in the burner pressure test point (B) andconnect a gas pressure gauge via a flexible tube.4. Switch the electricity supply ON and check that all externalcontrols are calling for heat.5. Set the boiler thermostat knob (G) to position 6. The fan willstart. After the fan has run for a few seconds the pilot solenoidvalve should open and the intermittent spark commence,continuing until the pilot is established. The main burner willthen cross-light smoothly. If this sequence does not occur,refer to the Fault Finding section.6. Test for gas soundness around ALL boiler gas componentsusing leak detection fluid.7. Operate the boiler for 10 minutes to stabilise the burnertemperature.8. The boiler is preset at the factory to its nominal rating.Refer to Table 2 (page 2). If adjustment is necessaryremove the sealing cap and turn the adjusting screwclockwise to increase/anticlockwise to decrease thepressure until the required burner pressure is achieved.Refit the sealing cap.9. Set the boiler mains on/off switch to OFF.10. Remove the pressure gauge and tube. Retighten thesealing screw in the pressure test point.11. Turn ON and check for gas soundness at the pressuretest point.12. Refit the lower front panel and secure with the 2 fixingscrews.52 COMMISSIONING AND TESTINGWARNING. Whilst effecting the required gas soundness test and purging air from the gas installation,open all windows and doors, extinguish naked lights and DO NOT SMOKE.A. ELECTRICAL INSTALLATION1. Checks to ensure electrical safety should be carriedout by a competent person.2. ALWAYS carry out preliminary electrical systemchecks, i.e. earth continuity, polarity, resistance toearth and short circuit using a suitable test meter.B. GAS INSTALLATION1. The whole of the gas installation, including the meter,MUST be inspected and tested for soundness, and purgedin accordance with the recommendations of BS. 6891.In IE refer to I.S.813:2002.2. Purging air from the gas installation may be expedited byloosening the union on the gas service cock on the boilerand purging until gas is detected.3. Retighten the union and check for gas soundness.LEGENDA. Gas control valve.B. Burner pressure test point.C. Main burner pressureadjuster.D. Inlet pressure test point.E. Gas service cock.F. Sightglass.G. Boiler thermostat knob.H. Main burner 'On' neon.J. Overheat thermostat resetbutton (optional).The Benchmark Log Book or equivalent self certification should be completed and signed to demonstrate compliancewith Building Regulations.INSTALLATION