Heating engineer
22
3
▶
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 firms 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
▶
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,
next to the appliance, to isolate it when required.
▶
Perform connection in compliance with applicable regula-
tions.
Gas pipes sizing
The gas pipes must not cause excessive load losses and, conse-
quently, insufficient gas pressure for the appliance.
Supply gas pressure
The appliance's gas supply pressure, both static and dynamic,
must comply with Table 3.3
p. 22, with tolerance ± 15%.
Non compliant gas pressure (Table 3.3
damage the appliance and be hazardous.
Table 3�3
Gas network pressure
Gas supply pressure
Product
category
Countries of destination
G20
[mbar]
G25
[mbar]
G30
[mbar]
G31
[mbar]
G25�1
[mbar]
G25�3
[mbar]
G27
[mbar]
G2,350
[mbar]
II
2H3B/P
AL, BG, CY, CZ, DK, EE, FI, GR, HR, IT, LT,
MK, NO, RO, SE, SI, SK, TR
20
30
30
AT, CH
20
50
50
II
2H3P
BG, CH, CZ, ES, GB, HR, IE, IT, LT, MK, PT,
SI, SK, TR
20
37
RO
20
30
AT
20
50
II
2ELL3B/P
DE
20
20
50
50
II
2Esi3P
; II
2Er3P
FR
20
25
37
II
2HS3B/P
HU
25
30
30
25 (1) (2)
II
2E3P
LU
20
50
II
2L3B/P
NL
25
30
30
II
2EK3B/P
NL
20
30
30
25 (1) (2)
II
2E3B/P
PL
20
37
37
II
2ELwLs3B/P
20
37
37
20 (2)
13 (2)
II
2ELwLs3P
20
37
20 (2)
13 (2)
I
2E(S)
; I
3P
BE
20
25
37
I
3P
IS
30
I
2H
LV
20
I
3B/P
MT
30
30
I
3B
30
(1) GAHP-AR not approved for G25.1, G25.3 gases.
(2) GA ACF not approved for G25.1, G27, G2.350, G25.3 gases.
