Immergas HERCULES Condensing 26 2 E Manual page 16

Technical Documentation
Central heating pump (4).
It operates on the system flow after the hydraulic manifold
(1).
It is physically fixed onto the system flow pipe and to the
boiler flow manifold, to which it is connected using threaded
fittings.
Hydraulic manifold (1) (manifold).
It is an open manifold onto which the coiler and system flow
and return pipes are connected and which allows, along with
boiler (2) and CH pumps (4) (see previous page) to make a flow
rate and head available to the system that is high with respect
to the traditional boiler.
This takes place because the circulation inside the primary
circuit is guaranteed by the boiler pump and therefore the CH
pump head is not reduced by the appliance head losses.
The open manifold (1) also allows to mix the flow water with
a part of the return water and therefore supply a flow rate that
is higher than that circulating in the boiler.
To ease the escape of any air bubbles and gaseous substances,
there is an automatic air vent in the upper part of the hydraulic
manifold (2).
Safety devices and controls.
By-pass (6).
Guarantees circulation in the primary circuit also when the
high resistance of the system does not allow it.
It is mounted between the system flow and return connection
pipes.
System filter (7).
It prevents any impurities present in the system from obstruct-
ing the primary circuit (heat exchanger) and preserves the one-
way valves by preventing leaks occurring on the CH system
during DHW functioning.
It is inserted into the by-pass block in correspondence with
the fitting to the system return pipe.
"Europa" system one-way valve (5).
Prevents undesired circulation in the system when the pump
(4) is not working.
It is inserted into the first flow pipe of the respective by-pass.
N.B.: The pump, the system by-pass, the system filter and
the one-way valve of zone 1 are supplied as per standard,
while the others are included in the zone systems connection
kit (optional).
STHCkW ed 0409
Technical Documentation
1
Primary
Primary
Flow
Return
6
5
14
2
R3
M3
R2
M2
R1
M1
R
7
M
HERCULES Condensing Export