AFRISO PrimoBox ACB 910 Manuale di funzionamento e installazione - Pagina 15

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6.3.2

Connection of individual heating circuits

(direct circuit and mixing circuit)

6.4 Differential pressure relief valve DU

6.5 Electrical connections

PrimoBox ACB 910 mixing unit for condensing boilers

The connection between the ACB unit and the heating system is made

via supply and return connections with female G¾" threads located

at the bottom of the ACB unit. The maximum length of underfloor

heating pipes, resistance of flow, as well as the flow of medium by the

circuit with mixing must comply with the permissible values of flows

and resistances according to the chart presented in subsection 4.2.

In a direct circuit with thermostatic valves

or zone valves, it is necessary to use

a pressure

differential

(bypass). It is designed to maintain

pressure on the boiler pump,

a constant

which also works as a direct zone (radiator

zone) circulation pump. Recommended

valve

setting

overpressure.

If the direct installation is characterized by high hydraulic resistance

and the relief valve opens too early (not allowing for adequate flow

on the radiator furthest away from the heat source) the setting should

be increased to 0.2-0.3 bar.

If thermostatic valves are not installed in the direct circuit next

to the radiators and no zone valves are used, set the differential

pressure relief valve DU to 0.5 bar overpressure.



Make sure that the power supply has been disconnected and

protected against accidental switching on.



Comply with the accident prevention regulations and other rele-

vant accident prevention regulations.

The ACB mixing unit for condensing boilers is connected to 230V AC.

The ACB mixing kit has a built-in electrical box. During assembly

there is only a need to connect the pump and actuator dedicated ca-

bles to the electrical box. The connection between the electrical box

and the pump and actuator is already made at the factory.

bypass

0.1-0.2

Fig. 8: Differential pressure relief valve AFRISO DU

Instruction manual

valve

bar