Secondary Circuit - Immergas ZEUS Superior Series 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.
This occurs when domestic hot water is used and to restore the losses due to thermal dispersion .
- OPERATION
Following a d.h.w. request, the modulation board starts the boiler pump (7) and powers the
motor of the electric 3-way valve (8).
The consequent movement of the valve to domestic hot water position (see 3-way electric valve
operation), closes the system return pipe (R) and, at the same time, opens the return pipe of the
storage tank coil (4).
This way, circulation is allowed in the coil (4) 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.
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STZS ed 06/03 ZEUS SUPERIOR