Immergas HERCULES Condensing 26 2 E Manual page 20

Technical Documentation
Functioning with mixed systems (as per standard for HERCULES Condensing ABT, optional for
HERCULES Condensing)
(configuration with Low Temperature Kit).
STORAGE TANK
COILS
RETURN
STORAGE TANK
COILS
FLOW
The coupling to a mixed system divided into two zones envi-
sions the installation of the "low temperature kit" inside the
casing.
The assembly of this kit leads to the use of a three-way mixing
valve (7), a zone management board (21) (see "Zones digital
control unit" functioning) prepared for control of the valve and
the pump (10), a system by-pass (13) and one-way valve (9)
to be inserted into the system return pipe.
Thanks to this system, the boiler can serve two zones operat-
ing at differentiated temperatures; a high temperature zone
(example radiators) and a low temperature zone (example floor
radiating panels).
high temperature" zone (zone 1 already standard).
This portion of circuit is envisioned to operate at an ideal
temperature for radiator plants, fan coils etc.
It is served by the standard pump and its temperature is ad-
justed by acting on the boiler control panel.
"low temperature" zone (zone 2).
This portion of circuit is envisioned to operate with floor
panel systems.
It is served by a pump (10) which, via a motorised 3-way
mixing valve (7), introduces water into the system at constant
temperature.
To allow this, the 3-way valve (7) is controlled by a P.C.B.
(21) that varies the position depending on the pre-selected
temperature (from 25°C to 50°C).
This setting is made on the boiler control panel.
The temperature of the flow water is obtained by mixing the
high temperature circuit flow water and the low temperature
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Technical Documentation
21 10 7
circuit return water in variable quantities according to neces-
sity, (see hydraulic diagram).
The control of the correct mixing is entrusted to an NTC probe
(12) connected to the zones control unit (21).
18
13
9
RB1
MB1
RA1
MA1
12
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