Immergas HERCULES Condensing 26 2 E Manual page 24

Technical Documentation
DHW circuit.
The DHW circuit is affected every time it is necessary to take
the temperature of the water contained in the storage tank to
the desired temperature (15) and is measures using the DHW
NTC probe (14).
This can take place in the case of a domestic hot water with-
drawal or to restore the losses due to heat loss.
Operation.
Following a DHW request, the integrated P.C.B. starts the
boiler pump (1) and powers the electric 3-way valve motor
(2).
The consequent shifting of the valve into the DHW position
STHCkW ed 0409
Technical Documentation
(see electric 3-way valve functioning) leads to the closure of the
hydraulic manifold return pipe and the simultaneous opening
of the passage towards the storage tank coil (13).
In this way circulation inside the CH system is prevented,
while it is allowed in the coil (13), which allows the cold wa-
ter to absorb the heat contained in the primary circuit water
through its walls.
The CH phase is excluded in this phase over which the produc-
tion of DHW has priority.
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HERCULES Condensing Export