Immergas UB INOX SOLAR 200-2, Instruction Booklet And Warning

Page: 6 / 16

6
1
2
3
4
5
6
7
6
10
11
1
4
8
12
9
14
2
13
3
5
1
IN OUT
2
9 8
11 4
5
7
12
6
13
1- 6
INS
T
ALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Key:
1 - Solar pump
2 - Shut-off valve with thermometer
3 - Safety valve drain fitting
4 - Flow meter
5 - 6 bar safety valve
6 - 3/4” connection for expansion vessel
7 - Manometer
8 - Draining valve
9 - Filling valve
10 - Insulating casing
11 - Flow rate regulator
12 - Inlet
13 - Output
14 - Reference for flow rate reading
1.12 CIRCULATION UNIT MAIN
COMPONENTS.
The pump unit allows to connect the storage tank
to the solar collector, making the water circulate
according to the requests of the control unit.
1.13 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;
- check the presence of the safety devices and
their functionality, particularly:
- safety valve (6 bar)
- expansion vessel
- thermostatic mixing valve
- check that there are no leaks in the hydraulic
circuit;
- check that there is an air vent valve positioned
in the highest point of the circuit above the
collector and that it is operational;
- check connection to a 230V-50Hz power
mains, correct L-N polarity and the earthing
connection;
- check that all prescriptions relative to the
boiler and the CH circuit have been respected,
as described in the relative boiler instruction
book.
If even only one control inherent to safety gives a
negative result, do not start 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
envisioned on the UB INOX Solar 200-2 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 collector.
Example:
The circulation unit is found on the ground floor
and the solar collector 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, this
must be re-integrated.
1.14 SOLAR CIRCUIT SYSTEM FILLING.
The system can only be filled when:
- the system is assembled completely;
- any working residues have been eliminated
that cause obstructions and through time
deteriorate the features of the glycol;
- all presence of water in the system has been
eliminated, which could cause damage 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
according 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 automatic pump flow pipe to the
filling valve fitting (9 Fig. 1-6) positioned below
the pump and open the valve itself.
2 connect the automatic pump return pipe to the
draining valve fitting (8 Fig. 1-6) and open the
draining valve.
3 The flow rate regulator adjustment screw
(11 Fig. 1-6) must be horizontal in order to
guarantee closure of the integrated ball valve.
Open the ball valve with thermometer (2 Fig.
1-6) positioned over the pump.
4 fill the filling pump tank with the amount of
glycol necessary plus a minimum stock to
be left on the bottom of the tank in order to
prevent air circulating inside the circuit.
5 The filling phase must have minimum
duration of 20 ÷ 25 minutes. This is the time
needed to completely remove all air from the
circuit. Every now and again open the flow
rate regulator adjustment screw in order to
eliminate air from inside (vertical position).
6 Eliminate any air in the solar circuit preferably
using the so-called "pressure shot" method,
which consists in raising the filling pressure of
the circuit followed by a quick opening of the
return valve (8 Fig. 1-6). This method allows
to expel the air from the circuit.