Immergas HERCULES SOLAR 26 1A Manual page 14

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 boiler 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
obstructing 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).
STHSC ed 0710
Technical Documentation
1
Primary
Primary
flow
return
6
5
12
2
R3
M3
R2
M2
R1
M1
R
7
M
HERCULES Solar 26 1A