AFRISO PrimoBox ACB 910 Manuel d'utilisation et d'installation - Page 7

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3.2 Operation

PrimoBox ACB 910 mixing unit for condensing boilers

PrimoBox ACB is a hydraulic unit for two heating zones with different

supply temperatures, where one of the circuits is direct and on

the other the temperature is lowered via the mixing valve.

This is a solution dedicated only for condensing boilers.

The PrimoBox ACB mixing unit performs the following functions:

• Esures a lower return temperature, which helps condensation

in the gas boiler, increasing its efficiency

• Direct heating zone connection

• Connection for a zone with reduced temperature obtained

by mixing

The PrimoBox ACB unit does not use a standard 3-way mixing valve,

but a special 4-way valve with 6 ports and a disproportionate valve

sleeve. The purpose of this special 4-way valve is to use the medium

returning from the direct zone (without mixing) to supply the zone with

reduced temperature.

Shut-off valves with thermometers

The ACB mixing units are supplied with shut-off valves to facilitate

product maintenance. Check valves have been built into the shut-off

valves and slot for temperature sensors has been prepared. The valve

knobs contain thermometers to control the temperature of the heating

medium. By turning the knob 45°, the non-return valve is forced to

open for easy maintenance and system filling.

Grundfos UPM3 AUTO 15-70 circulation pumps

For the operation of the Grundfos UPM3 AUTO circulation pump

included in the PrimoBox units, please refer to the attached operating

instruction (also available on the pump manufacturer's website).

Instruction manual