3 Plumbing installer
Installation, Use and Maintenance Manual – GA Line ACF Series
21
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1 WATER CIRCULATION PUMP, towards the appliance;
on the output water piping (m)
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1 SAFETY VALVE (3 bar);
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1 EXPANSION TANK of the individual unit.
Figure 3�3 – Hydraulic plan
3�4 WATER CIRCULATION PUMP
The circulation pump (flow and head) must be selected and
installed based on pressure losses of plumbing/primary circuit
( comp exchange ter appliance).
For the appliance's pressure losses refer to Table 1.1 p. 16 and
Design Manual.
Circulation pump
The primary circulating pump must be obligatorily controlled
by the appliance's electronic board (S61) (see Paragraph
1.5 p. 14).
3�5 ANTIFREEZE FUNCTION
Anti-icing self-protection
The anti-icing function, if activated, automatically starts the
primary circulation pump when the outside temperature ap-
proaches zero.
Electrical and gas continuity
The anti-icing self-protection is only effective if the
power and gas supplies are assured. Otherwise, anti-
freeze liquid might be required.
3�6 ANTIFREEZE LIQUID
Precautions with glycol
The manufacturer disclaims any liability for any damage
caused by improper glycol use.
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Always check product suitability and its expiry date
with the glycol supplier. Periodically check the prod-
uct's preservation state.
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Do not use car-grade antifreeze liquid (without in-
hibitors), nor zinc-coated piping and fittings (incom-
patible with glycol).
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Glycol modifies the physical properties of water
(density, viscosity, specific heat...).
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Dimensionare le tubazioni, la pompa di circolazione
e i generatori termici di conseguenza.
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With automatic system water filling, a periodic check
of the glycol content is required.
Operation with outside temperatures < 10 °C
If the outside air temperature is expected to be lower
than +10 °C add glycol to prevent a greater icing risk.
Type of antifreeze glycol
Inhibited type glycol is recommended to prevent oxidation
phenomena.
Glycol effects
The Table 3.1 p. 21 shows, indicatively, the effects of using a
glycol depending on its percentage.
Table 3�1 – Technical data for filling the hydraulic circuit
GLYCOL %
10
15
20
25
30
35
40
WATER-GLYCOL MIXTURE FREEZING TEMPERATURE
-3°C
-5°C
-8°C
-12°C
-15°C
-20°C
-25°C
PERCENTAGE OF INCREASE IN PRESSURE DROPS
--
6%
8%
10%
12%
14%
16%
LOSS OF EFFICIENCY OF UNIT
--
0,5%
1%
2%
2,5%
3%
4%
3�7 SYSTEM WATER QUALITY
Responsibility of the user/operator/installer
The installer, operator and user are bound to assure
system water quality (Table 3.2 p. 22). Failure to
comply with the manufacturer's guidelines may affect
operation, integrity and duration of the appliance, void-
ing the warranty.
System water features
Free chlorine or water hardness may damage the appliance.
LEGEND
1
Anti vibration joint
2
Pressure gauge
3
Flow rate adjustment valve
4
Water filter
5
Shut off valves
6
Water pump (primary circuit)
7
Safety valve (3 bar)
8
Expansion tank
9
Hydraulic separator / inertial tank with 4
fittings
10
Water pump (secondary circuit)