LAMBORGHINI MEGA 92, Operating, Installation And Maintenance Instructions

Page: 48 / 116

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INSTALLATION
RECIRCULATING PUMP
The condensation of the water vapour contained in the flue gas leaving
the boiler (condensate) occurs when the return water temperature is less
than 55°C and is significant above all when starting in the morning, after
the boiler has been off all night. This condensate is acidic and corrosive
and, over time, attacks the metal plate on the boiler. Consequently, a recir-
culating pump with the function of preventing condensate should be
installed between the outlet and return fittings, upstream of any mixing
valve.The pump must ensure, when the system is operating, a flow-rate of
between 20 and 30% of the total; it must also ensure a return water tem-
perature no less than 55°C, while the required discharge head is quite low,
as it only needs to overcome the resistance of the boiler and the valves.
To measure the effective central heating return inlet temperature for the
purpose of controlling the condensate prevention pump or managing
the functions for getting the system to stable temperature operation, a
probe socket must be fitted at a distance equivalent to 3-5 times the dia-
meter of the return pipe upstream of the water coupling.