9
1-8
V4
V3
V2
V1
A4
A3
A2
A1
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Solar circulation unit available head.
Key:
Vn = Available head
An = Circulating pump absorbed power
Ci
rcu
la
to
r p
um
p a
bs
or
be
d p
ow
er (
W
)
Flow rate (l/h)
H
ea
d (kP
a)
1.12 COMMISSIONING.
Preliminary checks on the solar system
Before filling the hydraulic circuit and starting
the system, carry out the following checks:
- ensure that the declaration of conformity of
installation of the solar system is supplied with
the appliance;
- make sure the safety devices are included and
are operating properly, particularly:
- safety valve (6 bar)
- expansion vessel
- thermostatic mixing valve
- make sure there are no leaks in the hydraulic
circuit;
- make sure there is an air vent valve positioned
in the highest point of the circuit above the
manifold and that it is operational.
- check connection to a 230V-50Hz power
mains, correct L-N polarity and the earthing
connection;
- Check that all the requirements relating to
the boiler and the central heating circuit have
been complied with, as described in the relative
boiler instruction book.
If even only a single safety check offers a negative
result, do not commission the system.
Expansion vessel factory-set pressure of the
solar circuit hydraulic unit.
To compensate the high temperatures that can be
reached by the liquid in the circuit and therefore
its dilation, an expansion vessel has been fitted on
the UB INOX SOLAR 200 ErP storage tank, with
sufficient capacity to perform this task.
The expansion vessels are supplied factory-set at
2.5 bar. It is therefore necessary to charge them to
the pressure necessary for the circuit.
The expansion vessel must be charged to:
2 bar + 0.1 bar for every metre of the water
column.
“
metre of the water column”
means the vertical
distance that is present between the expansion
vessel and the solar manifold.
Example:
The circulation unit is found on the ground floor
and the solar manifold is found on the roof at a
hypothetical height of 6 m, the distance to be
calculated is:
6 m x 0.1 bar = 0.6 bar
therefore the expansion vessel must be charged
to:
2 + 0.6 =
2.6 bar
Hydraulic unit safety valve.
There is a safety valve present on the hydraulic
unit that protects the system from an excessive
increase in pressure. This valve intervenes by
discharging the liquid contained in the circuit
when the pressure reaches 6 bar.
If the safety valve intervenes and therefore part of
the liquid contained in the circuit is lost, it must
be re-integrated.
1.13 FILLING THE SOLAR CIRCUIT
SYSTEM.
The system can only be filled when:
- the system is completely assembled;
- any operational residues have been eliminated
that may cause obstructions and deteriorate the
features of the glycol over time;
- any presence of water in the system has been
eliminated, which could otherwise cause dam-
age to the system in winter;
- the absence of leaks has been verified by checks
using air;
- the storage tank unit has been filled;
- the expansion vessel has been charged accord-
ing to system requirements.
The system must be filled only using the glycol
supplied by Immergas via an automatic pump.
The system must be filled with vent valve closed.
Proceed as follows to fill the system:
1 connect the flow pipe of the automatic pump to
the fitting of the filling valve (9 Fig. 1-4) located
under the pump and open the valve.
2 connect the return pipe of the automatic pump
to the fitting of the draining valve (8 Fig. 1-4)
and open the draining valve.
3 The flow-rate regulator screw (11 Fig. 1-4) must
be orientated horizontally to ensure the closure
of the integrated ball valve. Open the ball valve
with thermometer (2 Fig. 1-4) above the pump.
4 Fill the filling pump tank with the amount of
glycol necessary plus a minimum amount to
be left on the bottom of the tank in order to
prevent air circulating inside the circuit.
5 The filling stage must have a minimum dura-
tion of 20 ÷ 25 minutes. This time is required
to completely remove all air from the circuit.
Every now and again open the flow rate regula-
tor adjustment screw in order to eliminate air
from inside (vertical position).
