Immergas HERCULES Condensing 26 2 E Manual page 22

Technical Documentation
HERCULES Condensing functioning with mixed systems with 2 additional mixed zones
(optional)
(configuration with Low Temperature Kit).
STORAGE TANK
COILS
RETURN
STORAGE TANK
COILS
FLOW
The division of the mixed system into three zones requires the
assembly of a relevant kit inside the casing, which envisions
the use of the zones management board (21) (see "Digital zones
board" functioning), two additional pumps to that already
mounted as per standard (10 and 17), two 3-way mixing valves
(7 and 14), two system by-passes (13 and 20) and two one-way
valves (9 and 16) to be inserted into the system return pipes.
Thanks to this system, the boiler can serve three zones operat-
ing at differentiated temperatures; a high temperature zone
(example radiators) and two low temperature zones (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
circuit return water in variable quantities according to neces-
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Technical Documentation
17
21
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sity, (see hydraulic diagram).
The control of the correct mixing is entrusted to an NTC probe
(12) connected to the zones control unit (21).
20
16 19
7 9 20
RB2
MB2
RB1
MB1
RA1
MA1
12
HERCULES Condensing Export
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