Technical data

69
• Reassembletheuehoodtakingcarethattherearlipofthehoodis
correctly located under the top lip formed on the top of the rear com-
bustion chamber wall.
• Replacetheairdeector,fanandairpressureswitchinreverseor-
der.
• Checktheairpressureswitchsensingpipesfordamageandreplace
as required taking care to preserve the correct connection. (The pipe
coming from outside air should be plugged to the switch P1 inlet; the
pipe coming from fan should be plugged to the switch P2 inlet. )
• Remove the screw on the frontal face of the pump to access the
pump shaft and rotate the shaft with a screwdriver to check for any
blockage. Clean any dirt and replace the screw.
• Replacethecombustionroomfrontpanel,inhermeticmodelsher-
metic room front panel, and front casing panel in reverse order. Do
not forget to screw the two front panel-retaining catches at the top RH
and LH sides of the boiler.
• Check the operation of the pressure relief valve as described in
“Commissioning” section.
• Check that the system is at the original (cold) design pressure. If
necessary, re-pressurize the system.
• Checktheairsidepressureoftheexpansionvesselandpumpairto
increase it up to 1,2 bar.
• Oncompletionoftheserviceworkandreassemblyoftheappliance,
check for gas soundness and the correct operation of the applian-
ce as described “Commissioning” section. Reset the controls to the
users’ requirements.
• Atfinal,adjusttheboileraccordingtothecustomer’sdesire.