Immergas HERCULES Condensing 26 2 E Manual page 10

Technical Documentation Technical Documentation
Primary circuit (boiler circuit).
The primary circuit, with relative control and safety devices,
is started every time there is a central heating or domestic
hot water request.
Operation (see HERCULES Condensing hy-
draulic diagram).
The heat contained in the combustion products is absorbed
by the pipes of the water-gas primary heat exchanger with coil
inserted in the condensation module (17) which then gives
the heat up to the water made to circulate inside the boiler
pump (26).
The water is introduced directly into the hydraulic manifold
(34) and therefore to the system or can be diverted inside the
storage tank coil (1).
This depends on the position of the motorised 3-way valve
(28), which depending on request, allows flow towards the
system flow and return pipes of the hydraulic manifold (34)
or causes diversion towards the coil (1).
Boiler pump (1).
Operates on the primary circuit return immediately after the
3-way valve to which it is connected. It is part of the integrated
multifunction unit realised in composite material.
There is a seat on the body where the automatic air vent valve
(2) is housed.
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