3 Heating engineer
22
The manufacturer disclaims any liability for any damage
caused by improper glycol use.
▶
Always check product suitability and its expiry date
with the glycol supplier. Periodically check the prod-
uct's preservation state.
▶
Do not use car-grade anti-icing liquid (without inhib-
itors), nor zinc-coated piping and fittings (incompat-
ible with glycol).
▶
Glycol modifies the physical properties of water (den-
sity, viscosity, specific heat...). Size the piping, circula-
tion pump and thermal generators accordingly.
▶
With automatic system water filling, a periodic check
of the glycol content is required.
With high glycol percentage (> 20…30%)
If the glycol percentage is ≥30% (for ethylene glycol) or
≥20% (for propylene glycol) the TAC must be alerted be-
fore first start-up.
Type of anti-icing glycol
Inhibited type glycol is recommended to prevent oxidation
phenomena.
Glycol effects
The Table 3.1 p. 22 shows, indicatively, the effects of using a
glycol depending on its %.
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 must assure system wa-
ter quality (Table 3.2 p. 22). Failure to comply with the
manufacturer's guidelines may affect operation, integ-
rity and life of the appliance, voiding the warranty.
Table 3�2 – Chemical and physical parameters of water
CHEMICAL AND PHYSICAL PARAMETERS OF WATER IN HEATING/COOLING
SYSTEMS
PARAMETER
UNIT OF
MEASUREMENT ALLOWABLE RANGE
pH
\
>7
(1)
Chlorides
mg/l
< 125
(2)
Total hardness (CaCO
3)
°f
< 15
°d
< 8.4
Iron
mg/kg
< 0.5
(3)
Copper
mg/kg
< 0.1
(3)
Aluminium
mg/l
< 1
Langelier’s index
\
0-0,4
HARMFUL SUBSTANCES
Free chlorine
mg/l
< 0.2
(3)
Fluorides
mg/l
< 1
Sulphides
ABSENT
1
with aluminium or light alloys radiators, pH must also be low-
er than 8 (in compliance with applicable rules)
2
value referred to the maximum water temperature of 80 °C
3
in compliance with applicable rules
System water features
Free chlorine or water hardness may damage the appliance.
Adhere to the chemical-physical parameters in Table 3.2 p. 22
and the regulations on water treatment for residential and in-
dustrial heating systems.
Water topping up
The chemical-physical properties of the system's water may alter
over time, resulting in poor operation or excessive topping up.
▶
Ensure there are no leaks in the installation.
▶
Periodically check the chemical-physical parameters of the
water, particularly in case of automatic topping up.
Chemical conditioning and washing
Water treatment/conditioning or system washing car-
ried out carelessly may result in risks for the appliance,
the system, the environment and health.
▶
Contact specialised forms or professionals for water
treatment or system washing.
▶
Check compatibility of treatment or washing prod-
ucts with operating conditions.
▶
Do not use aggressive substances for stainless steel
or copper.
▶
Do not leave washing residues.
3�8 INSTALLATION FILLING
How to fill up the system
After completing all water, electrical and gas
connections:
1. Pressurise (at least 1.5 bar) and vent the hydraulic
circuit.
2. Let water flow (with appliance off).
3. Check and clean the filter on the inlet pipe.
4. Repeat items 1, 2 and 3. until the pressure has stabi-
lised (at least 1.5 bar).
3�9 FUEL GAS SUPPLY
Gas connection
▶
3/4" F
on the right, at the bottom, connection plate (Figure 1.1 p. 7).
▶
Install an anti-vibration connection between the appliance
and the gas piping.
Mandatory shut-off valve
▶
Provide a gas shut-off valve (manual) on the gas supply line,
to isolate the appliance when required.
▶
Perform connection in compliance with applicable regula-
tions.
