Starting the boiler First starting up Before starting the boiler check that: - The gas meter tap is open. - The boiler gas service cock is open. - The boiler is connected to the electrical supply. •Following the instructions given in the '

COMMISSIONING

Controlsand Lighting Important: The commissioning and first firing of the boiler mustonly be done by a competent person. ' section, set boiler to run in centralheating mode. •Set boiler thermostat for maximum temperature and check that any external controls, if fitted, are calling for heat. •Allow the temperature to rise to the maximum value, with all radiator valves open.The temperature rise will cause release of the gasescontained in the water of central heating system.- Gases driven towards the boiler will be automati-cally released through the automatic air vents. - The gases trapped at the highest point of the sys- tem must be released by bleeding the radiators.On reaching maximum temperature, the boilershould be turned off and the system drained asrapidly as possible whilst still hot. •Refill system to a pressure of 1 bar and vent asbefore.•Restart boiler and operate until a maximum tem-perature is reached. Shut down boiler and ventheating system. If necessary, top up heating sys-tem and make sure that a pressure of 1 bar is indi-cated on the pressure gauge when system is COLD.
Diagram 15 - If this procedure is not carried out properly, the boiler will go into safety lock-out until all of the air has been purged. - When venting air from boiler, do not touch the schrader valve on the expansion vessel, it is NOT a vent. diagram 15.Filling the system Gas installation It is recommended that any air is purged from the supply at the gas inlet test point on the lower right hand side of the gas valve, see •Open shut off valves, see diagram 5 (slot of screwcorresponds to flow direction), and caps on auto- matic air vents on top of pump and top right hand side of boiler. •Bleed each radiator until a continuos jet of wa- ter is obtained. •Do not close automatic air vent caps on boiler. •Open various hot water taps to bleed system. •Make sure that pressure gauge reads between 1 and 2 bar. Re-pressurise system as necessary. Gas pressures The main burner pressure should be checked dur-ing commissioning to make sure the correct inputis obtained. Proceed as follows: •Shut down boiler.
Gas inlet test point Ins 009 Diagram 16 Connect the pressure gauge to = measuring point MP and RMP MP RMP = reference measuring pointpressure gauge Ins 006 •Start boiler as described in ' Instruction for Use see dia-gram 17. '.•Set OFF/Summer/Winter switch to 'Winter' (Heat- ing and hot water ) position. •Undo screws on burner pressure test points RMP and •Connect a suitable pressure gauge. •Gain access to the rear of the control panel and locate the range rating adjuster screw, MP below sealed combustion chamber, seediagram 16. 13