Immergas NATURAL SOL 150 V2, Instructions And Recommendations, Page: 32 / 36

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k
k5
k6
k4
k4
k2
k2
k1
k3
k8
k7
k9
k9
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TALLER
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MAINTEN
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1.11 ELECTRICAL RESISTANCE.
Ref. Description Q.ty
k1 Closing plate 1
k2 Nut 8
k3 Storage tank gasket 1
k4 Washer 8
k5 Flange 1
k6 Gasket 1
k7 1.5 kw electric resistance 1
k8 Solar storage tank anode 1
k9 Screw 4
N.B.: before closing the external cover (k1)
regulate the thermostat of the resistance
(k7) to the desired temperature (the
device is deactivated on the first notch).
The resistance must be regulated and
started only for emergency situations
and in the case of low environment
temperature.
N.B.: the electric resistance must be connected
by a qualified technician. All of the con-
nections must be performed following
the diagram shown below.
N.B.: the electric connections must only be
made on the thermostat. DO NOT
connect the electric power supply to the
resistance by-passing the thermostat.
N.B.: the resistance must be connected to the
power supply via a bipolar safety switch.
The distance between the connectors
must be AT LEAST 3 mm.
Safety button
Thermostat
1.12 SOLAR SYSTEM FILLING.
The steps stated below must be performed before
commissioning:
- washing the system and sealing test
If copper piping is uses and strong braze-welding
is performed, the system must be washed to re-
move the residues of braze-welding. Successively
perform the sealing test.
When installation has been completed, fill the cir-
cuit using the hole on the top of the tank (remove
the 3/4" cap located near the flange). To facilitate
filling, it is recommended to remove the safety valve
in order to use the hole as a vent. On completion
re-mount the cap and the safety valve.
N.B.: the circuit must be loaded slowly in a way
to remove the air it contains completely.
1.13 SYSTEM FILLING WITH GLYCOL.
The glycol must be mixed with the water in a con-
tainer before the system is filled (e.g. 40% glycol
and 60% water allow an anti-freeze resistance to
temperature of -22°C).
The propylene glycol is studied especially for
solar applications as it maintains its features
within the -32÷180°C interval. Moreover, it is
non-toxic, biodegradable and biocompatible.
Do not use automatic filling systems.
The solar collector must be filled immediately
with the water and glycol mixture, since after
washing it may still contain water (freezing
hazard).
Use the following table as a reference:
Concentration % Temperature °C
10 -5
20 -8
30 -16
40 -22
50 -32
Unless strictly necessary, it is recommended
not to mix the protective liquid at a concen-
tration > 50% (protection to -32°C).
When the system has been completed, make
sure that the water pipes have been isolated
correctly.
Do not fill the system in conditions with strong
insolation and with the manifolds at high
temperatures.
Make sure that all air bubbles have been com-
pletely eliminated.
STD.005441/000