12
Installation (must be carried out only by qualified technicians)
Therm 4300 – 6 720 821 607 (2018/01)
5.1 Important information
▶ Before installation, consult the gas company and current
legislation regarding gas appliance and site ventilation.
▶ Install a gas shut-off tap as close to the appliance as
po
ssible.
▶ After connection to the gas main, the appliance should be
ca
refully cleaned and tested for leaks; to avoid damage
from excess pressure in the valve gas regulator, this should
be carried out with the gas valve shut.
▶ Ensure that the appliance installed is
suitable for the type
of gas provided.
▶ Ensure that the flow and pressures for the regulator
install
ed are those indicated for the consumption of the
appliance ( see technical data in table 4).
Water quality
The device is used for DHW heating for domestic purposes in
accordance with the relevant r
egulations. Use of a water
treatment system is recommended in areas with a high level of
water hardness. The water parameters, which have an effect on
limescale, must generally comply with the values given in
Tab. 5.
Table 5
TDS (Total dissolved solids) (mg/l) Hardness
(mg/l)
pH
0 - 600 0 - 180 6,5 - 9,0
NOTICE: Damage to the device!
If these values are not observed, it can result in
partial blockage and faster ageing of the
internal body of the device.
5.2 Selection of location for installation
Considerations relevant to location
• Do not install the appliance in rooms where the free volume
is less tha
n 8 m
3
.
• Fulfil requirements specific to each country.
• The appliance must not be installed in sites where the
amb
ient temperature is susceptible to drop below 0 °C.
Wher
e there is a risk of freezing, disconnect and empty the
appliance.
• The gas heater must not be in
stalled over a heat source.
• To avoid corrosion, products such as solvents, inks,
inflammable gases
, glue or domestic detergents containing
halogenic hydro-carbons or any product that might
provoke corrosion must not be stored near the air
admission grill.
• Respect the minimum installation measurements indicated
in F
ig. 10.
• The heater must not be instal
led in locations where the
room temperature can reach 0 °C.
In case of a frost risk:
▶Turn the heater off
▶Purge the heater ( sect
ion 7.3).
DANGER: Flame reflow!
In case you suspect anything unusual in the
appliance operation:
▶shut down gas cock
▶ shut down water cock
▶ call an approved technician to check the
local conditions.
Outdoor installations: to p
revent flame reflow in outdoor
installations please make sure that a weather box /cover
protection is fitted.
Indoor installations:
to prevent flame reflow in indoor
installations please make sure that a weather box /cover
protection is fitted at the end of the secondary flue.
L(m) h(cm)
0-1 3
1-2 6
2-3 9
3-4 24
6720607539-02.6Av
³ 30
3
h
L
³ 180
33
40
³ 100
£ 140
Fig. 10 Minimum clearances (in cm)
Combustion gases
• All gas heaters must be connec
ted in a leak-roof manner to
a gas evacuation pipe of adequate dimensions.
•The flue must:
– be vertical (reduced horizontal sections or no
horiz
ontal sections at all)
– be thermally insulated
– have an exit above the maximum roof level
• A flexible or rigid pipe should be used, fit it inside the flue
soc
ket. The external diameter of the pipe should be slightly
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