Secondary Circuit - Immergas EOLO Superior PLUS 24 Technical Documentation Manual

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HYDRAULIC CIRCUIT

- SECONDARY CIRCUIT

(D.H.W. CIRCUIT)
The domestic hot water circuit is engaged every time the water contained in the storage tank and
measured by means of the d.h.w. NTC sensor (4) has to be restored to the desired temperature.
- OPERATION
Following a d.h.w. request, the modulation board starts the boiler pump (1) and powers the motor of the
electric 3-way valve (2).
The consequent movement of the valve to d.h.w. position (see 3-way electric valve), closes the system
return pipe (RI) and, at the same time, opens the return pipe of the storage tank coil (RB).
This way, circulation is allowed in the coil (3) which, through its walls, enables the cold domestic water
to absorb the heat contained in the primary circuit water.
In this phase, the central heating function is disconnected as the production of d.h.w. has priority.
- HEAD - FLOW TO STORAGE TANK GRAPH
To ensure the heat exchange of the
entire nominal heat output of the boiler,
the hydraulic connection to the PLUS
unit (optional) must have flow
resistances below those shown on the
graph alongside.
8 8
STESP ed 02/02 EOLO SUPERIOR PLUS