Icma 782 | Mixing group with variable point regulation unit

The ICMA motorized mixing unit is a device that allows mixing between two fluids in order to obtain
a desired temperature. It is used in heating and cooling systems, in thermal power stations and heat
generators (wall boilers, wood boilers, heat pumps).
The mixing of fluids takes place through a shaped bush that regulates the passage.
The mixing groups can be adjusted manually or with an electric servomotor (Art.787).

By-Pass setting

The mixing valve is equipped with a By-pass duct which allows to reduce the temperature of the water in the underfloor system by mixing the
lukewarm water of the return branch with the water of the discharge branch reducing any damage.
The by-pass regulation is made by means of the brass screw indicated in the drawing below (use a slotted screwdriver). For the OPEN / CLOSED
positions, see the diagrams shown alongside. When starting the system, it is advisable to keep the by-pass fully open (adjust it later)

Servomotor Configuration

The servomotor can be configured in the two ways shown below according to the type of group on which it will be mounted.
To change the configuration of a servomotor it is necessary to disassemble the article as indicated in the diagram below and replace it in one of the
two configurations shown in the images above. During these operations pay attention to the position of the RED / BLUE “S” disk.
WARNING: In both configurations the “S” disk must be mounted with the RED part facing up. The coupling of the “M” knob on the motor body “O”
instead, can be carried out in only one position, this is constrained by the shape of the toothed shaft on the motor body and by the relative seat in
the knob.

Automatic/Manual Operating

The servomotor has two operating settings: AUTOMATIC and MANUAL.
To set the servomotor in “AUTOMATIC” mode it is necessary to press the “P” button with a flathead screwdriver and turn it by moving the reference
mark towards the letter “A”, in this way the handwheel is linked to the internal servomotor mechanism. it will only move automatically.
To set the servomotor in “MANUAL” mode, instead, it is necessary to press the “P” button with a screwdriver and rotate it by moving the reference
mark towards the “hand” symbol, in this way the handwheel is free and can be rotated manually in the desired position.