Immergas HERCULES SOLAR 26 1A Manual page 23

Technical Documentation
Storage tank
It is a 200 litre stainless steel storage tank with coil and totally
insulated using self-extinguishing polystyrene.
It has an external casing enclosed in the upper part by a flange
fixed using 12 screws which, can be removed if necessary.
A concentric propeller-shaped stainless steel pipe (13) (coil)
is inserted inside, through whose walls heat exchange takes
place between hot water in the primary circuit and the water
contained in the storage tank unit.
This allows to keep the storage tank water at a constant
temperature and in the presence of a withdrawal guaranteed
the instant production of DHW.
If necessary, it is possible to extract the coil (13) from the
storage tank after having removed the lower inspection flange.
If necessary, the storage tank can be extracted frontally by
making it pass on the two "slides" (28) on which it rests.
Its regular functioning and its integrity are guaranteed by the
following devices:
Anode (14).
It is inserted into the storage tank and protects it from the
action of galvanic currents. Cap M24 on the front of the storage
tank unit is unscrewed.
Polyphosphate dispenser (optional).
Prevents the deposit of lime scale on the walls of the coil.
The kit is mounted inside the casing, connecting it to the
domestic cold water inlet.
It can be accessed by opening the lateral door.
Cold water inlet unit (30).
It is situated at the cold water inlet and is fitted to the expansion
vessel (26) and the system filling valve (3).
As well as an 8 bar valve (10) that prevents the safety pressure
in the storage tank from being exceeded, it includes:
- one filter, one flow limiter from 30 l/min and one one-way
valve (see hydraulic circuit part. "9") to prevent the consequent
pressure increase due to heating of the DHW causes return
towards the water network.
Pump kit (optional).
It allows the connection to any DHW recirculation system.
The kit includes a pump (11), which is housed inside the casing
with the relative connection pipe to the template, after having
removed the relative cap to which the recirculation probe is
connected (29) and the diversion pipe to the mixing valve.
Storage tank draining valve (24).
It is a draining valve with hose union fitting for emptying the
storage tank in the case of maintenance or internal inspection.
NTC domestic hot water probe (27).
It allows the integrated P.C.B. to detect the temperature of the
water contained in the storage tank.
It is fixed to the external wall of the storage tank and is inserted
inside an immersion sample point.
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Technical Documentation
Safety valve (10).
Prevents the safety pressure in the storage tank from being
exceeded (8 bar).
It is mounted on the domestic cold water inlet manifold unit
after the DHW one-way valve.
DHW expansion vessel (26).
It compensates the volume variation consequent of heating of
the water contained in the storage tank.
It is connected to the cold water inlet and has a pre-load
pressure of 2.5 bar with capacity of 8 litres.
11
29
24
27
28
21
10
30
AC
AF
3
26
13
14
HERCULES Solar 26 1A