8
STZM@ ed 05/04 ZEUS Maior @
Technical DocumentationTechnical Documentation
Secondary circuit (d.h.w. circuit).
e domestic hot water circuit starts working whenever the
temperature of the water in the storage tank (2) has to be
taken to the value wanted, measured by the d.h.w. NTC
probe (9).
is can happen if some hot water is drawn or when restoring
pressure drops due to heat loss.
Operation.
When domestic hot water is drawn, the modulation board
starts the boiler circulator (7) working and powers the motor
of the electric 3-way diverter valve (8).
When the valve shifts into the d.h.w. position (see operation
of the electric 3-way diverter valve) the system return (R) pipe
closes and simultaneously the passage opens to the storage
tank coil (4).
is prevents circulation in the heating system while it is al-
lowed in the coil (4) which, through its walls, lets the cold water
absorb the heat contained in the primary circuit water.
In this phase the central heating function is off, the production
of domestic hot water having priority.
To Next Page