Immergas 3.033210 Instruction And Warning Book page 51

1.27 KIT 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 check:
- 6 bar safety valve;
- expansion vessel;
- thermostatic mixing valve.
- Check that there are no leaks in the hydraulic circuit;
- make sure the air vent valve is positioned in the highest point of
the circuit above the manifold and that it is operational;
- check that the pack is connected to a 230V - 50Hz power mains,
that L-N polarity is observed and that there is an earthing con-
nection;
- check that all the requirements relating to the system and the
central heating circuit have been complied with, as described in
the relative pack instruction book.
Even if just one single safety check provides a negative result, do
not commission the system.
Expansion vessel factory-set pressure of the solar circuit hy-
draulic unit.
To compensate the high temperatures that can be reached by the
liquid in the circuit and therefore cause it to dilate in the kit, an
expansion vessel has been set up with a suitable capacity to per-
form this task. The expansion vessels are supplied pre-loaded at
2.5 bar. It is therefore necessary to deflate them and reload them
at the pressure required for the circuit.
The expansion vessel must be charged to:
1.5 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:
1.5 + 0.6 = 2.1 bar
Solar 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 in-
tervenes by discharging the liquid contained in the circuit when
the pressure reaches 6 bar.
If the safety valve intervenes and therefore the liquid contained
in the circuit is lost, it must be re-integrated.
1.28 SOLAR CIRCUIT SYSTEM FILLING.
The system can only be filled when:
- the system is completely assembled;
- any processing residues that cause obstructions and through
time deteriorate the features of the glycol have been eliminated;
- any presence of water in the system has been eliminated, which
could otherwise 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 using only the glycol supplied by Im-
mergas 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 cock
/ tap fitting (9) positioned below the pump and open the
valve itself.
2. Connect the automatic pump return pipe to the draining cock
/ tap fitting (8) and open the draining valve.
3. The flow rate regulator adjustment screw (11) must be hori-
zontal in order to guarantee closure of the ball valve with
thermometer (2) positioned above 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 time is required 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 non-return valve (8). This method allows air to be expelled
from the circuit.
7. Close the filling cock / tap and switch the filling pump off,
open the adjustment screw of the flow rate regulator (notch
in vertical position).
8. Leave the circuit pressurised. Any pressure drop indicates a
leak in the system.
9. Set the functioning pressure in the circuit at 1.5 + 0.1 bar for
every metre in the distance between the solar collector and the
expansion vessel (practically, set the same pressure between
expansion vessel and system). N.B.: Do not exceed 2.5 bar.
10. Switch the solar pump on at a maximum speed and make it
function for at least 15 minutes.
11. Disconnect the filling pump and close the fittings using the
relevant screwing plugs.
12. Open the ball valve above the pump completely.
Do not fill the system in conditions with strong insulation and
with the manifolds at high temperatures.
Make sure that all air bubbles have been completely eliminated.
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