Biral ModulA RED Serie Instrucciones De Instalación Y Funcionamiento página 12

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3.4 Non-return valve
If a non-return valve is fitted, the pump must be adjusted (see 7.2),
so that the discharge pressure of the pump exceeds the closing
pressure of the valve at all times.
This must be adhered to in particular for the proportional pressure
control (reduced delivery height for decreasing delivery flow).
3.5 Protection from the effects of frost
Warning
3.6 Heat insulation
Note
Heat losses can be reduced by insulating the pump casing
and pipes. For ModulA RED, heat insulation shells are included
in the delivery. Heat insulation shells can only be supplied
for single pumps.
Warning
3.7 Flow direction
The arrow on the pump casing indicates the flow direction.
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Where there is a risk of frost during downtime
periods, measures required to avoid frost
damage must be taken.
Heat is lost via the pump casing and pipes.
These heat losses should be limited
to a minimum.
➀ Never cover the frequency converter
or the control panel with insulation.
➁ Keep the drainage outlet at the motor free.