Immergas V2 Instructions And Warnings page 28

1.3 RECOMMENDED CHARACTERISTICS OF THE HYDRAULIC SYSTEM
The zone division of the hydraulic system downstream of the boiler must not affect the pressure and circulation characteristics of the
boiler; by way of example, remember not to insert a circulator downstream of the boiler with head that influences the control of the
system pressure sensor found inside the boiler.
It is recommended to use a hydraulic disconnector downstream of the boiler if mixing valves must be used or if several zones with
high circulation must be interlocked.
1.4 RECOMMENDED CHARACTERISTICS OF THE ELECTRICAL PARTS THAT CAN BE CONNECTED TO THE ZONE
MANAGEMENT P.C.B.
Zone valves
The zone valves can be controlled from the P.C.B. through connections X4 and X2 via 230 V power supply (max 1 A); see wiring dia-
grams 3 and 5 for details on connections.
Zone circulators
The zone circulators can be controlled from the P.C.B. through connections X4 and X2 via 230 V power supply (max 1 A); see wiring
diagrams 3, 5, 7 and 9 for details on connections.
Mixing valves
The mixing valves can be controlled from the P.C.B. through connections X4 and X2 via 230 V power supply (max 1 A).
The P.C.B. requires using powered valves with direct neutral connection and two phase connections: one for opening the valve and
one for closing it.
It is imperative to use mixing valves with an opening and closing time of 120 seconds; see wiring diagrams 3, 5, 7 and 9 for details on
connections.
Mixed zone flow temperature probes
Temperature management on mixed zones requires using NTC 10KΩ @ 25°C sensors. Β3435 (voltage 5Vdc); see wiring diagrams 5
and 7 for details on connections.
Safety thermostats for mixed zone flow
As a safety thermostat for every mixed zone it is necessary to use devices with low contact resistance (voltage 28Vdc); see wiring dia-
grams 7 and 9 for details on connections.
Room Thermostats
Combine 'potential-free contact' room thermostats (voltage 5Vdc) to the inputs of connector X9; see figures 14, 15 and 16 for details
on connections).
1.5 PROVISIONS FOR INSTALLATION
The connecting cables of the room thermostats must never be coupled to 230 V line cables.
The maximum distance of connections between zone kits and room thermostats must not exceed 50 m.
The maximum distance of connections between zone kits and boiler must not exceed 15 m.
In the event of malfunctions, faults or incorrect operation, turn the device off immediately and contact an authorised company (e.g. the
Immergas Technical Assistance centre, which has specifically trained staff and original spare parts). Do not attempt to modify or repair
the appliance alone. Failure to comply with the above implies personal responsibility and invalidates the warranty.
1.6 DIP SWITCH SETTINGS
The configurations available via dip switches on the board, allow you to indicate how many mixed zones are present, the adjustment
temperature of the mixed zones and other options on the main zone control (only if combined with Immergas boilers).
1.7 ELECTRICAL CONNECTION
The following operations must be carried out by technically qualified personnel. Before carrying out any operation, disconnect the
power supply from this kit, the boiler which it is connected to and other components of the hydraulic system, by actuating the respective
switches upstream of the various devices.
For electrical connections to the boiler, refer to the relevant instruction booklet.
Connecting Circulators or Zone valves
The zone circulators must be connected on terminal boards "X2" and "X4" and for earthing to terminal board "X3" of the zone kit, in
compliance with the numerical order dedicated to the various zones.
It is possible to control zone valves instead of the circulators, to be electrically connected in the same way as the circulators, as described
above (Fig. 3, 5, 7 and 9).
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