User manual

I-450-BE
5
2.3.2. Solid substances
Solid substances are e.g. sand or residues from the pip-
ing; to avoid these materials to deposit: insert a filter.
2.3.3. Dissolved substances
Dissolved substances are gases and salts.
Gases
If the gases are nitrogen, oxygen and carbon dioxide it
does not create any problems. If on the contrary the car-
bon dioxide is dissolved in an aggressive form as car-
bonic acid, the following measures (filter, degas) are to
be foreseen to avoid corrosion.
Salts
Salts dissolved in water influence the water quality as
hardening agent or non-hardening agent. Hard and/or very
saliferous water will harm the steam generator’s opera-
tion. The relevant standard for the water hardness is the
degree of German hardness (°d). It is classified as fol-
lows:
0 - 7°d - softened water
7 - 14°d - medium hard water
14 - 21°d - hard water
more - 21°d - very hard water
Only softened water (max. 5 - 7°d) ensures a trouble free
operation of the steam generator. A hardness too low (be-
low 5°d) can provoke corrosion inside the steam genera-
tor and the unit, increased hardness will lead to the calci-
fication of the heating elements and to break-down due to
the resulting heat accumulation, as well as to the calcifi-
cation of the steam generator and the unit. For a trouble-
free operation of the steam generator the following water
quality is recommended:
1. Hardness: 5 - 7° d
2. Chloride: no more than 150 - 250 mg/l
3. Sulphide: no more than 400 mg/l
4. Heavy metals: iron less than 0,10 mg/l
manganese less than 0,05 mg/l
copper only traces
5. Total saline content no more than 400 - 600 mg/l
In case the drinking water does not comply with these
indicative values, it must be adjusted - best directly be-
fore entering the steam generator - to the recommended
values. For harder water the installation of an ion ex-
changer is recommended, which must be regenerated
from time to time with cooking salt. By adding normal
water it is possible to reach the necessary hardness of 5°
d. The usual injection of phosphate to avoid lime deposits
and corrosion inside the piping is harmless if the intro-
duced quantity does not exceed 5 mg P
2
O
5
/l (2,5 mg
phosphoric acid anhydride P
4
O
10
) according to the rel-
evant drinking water regulations. In case this value will be
exceeded considerably for whatever reason, the residues
may have a negative influence on the steam generator
and the unit. Using not softened water a regular descaling
is absolutely necessary (see more precise explanations
given in the instruction manual). The descaling intervals
depend on the water hardness and the daily operation
hours; therefore it is not possible to provide precise indi-
cations.
Conversion to other degrees of water hardness:
1°d = 0,1783 mmol/l
= 1,79°F (France)
= 1,25°e (Great-Britain)
= 17,9 ppm (USA)
2.4. Connection to the drainage system
Observe the prescriptions of the national standards.
2.4.1. Open connection to the drainage system
The connection of the drainage pipe is foreseen at the
centre of the unit. The following is to be observed:
• Temperature resistant hose/pipe.
• Install with a constant direct slope (approx. 3%) with-
out any buckles.
• The waste water outlet must be outside the position-
ing surface of the unit (respect a distance of at least 1
m away from the unit. Formation of waste air/steam!).
• The waste water outlet must be approx. 30 mm above
the water level of a syphon drain or trough.
• Never reduce the diameter of the discharge pipe. Main-
tain the diameter of the connection sleeve.
• In case the unit is installed as part of a group, each
unit must be connected to a separate drain pipe into
an open funnel or syphon drain.
2.4.2. Fixed connection to the drainage system
• Waste water connection sleeve of unit:
R 1
1
/
4
" and R
3
/
4
" (5711 - 3)
R 1
1
/
4
" (5712/14 - 3)
Rp 1
1
/
2
" (5717 - 3)
• Waste water piping preferably as rigid pipe
• Install with a constant slope (approx. 3%)
• Installation of a rigid pipe:
- Sleeve joint nipple:
R 1
1
/
4
" - 34 mm (5711/12/14 - 3)
additional Rp 1
1
/
2
" - R 1
1
/
4
" (5717 - 3)
- Rigid PE-pipe 34 x 2
Important ! In case of a fixed connection to the drainage
system it is absolutely necessary to install a venting pipe
between unit and syphon drain. If this venting pipe is not
part of the unit it is available as accessory to be ordered
separately.
2.5. Connection to the exhaust gas discharge
- The installation underneath an extraction hood is rec-
ommended.
- A waste air quenching system is installed inside the
unit as standard equipment. It is controlled by means
of a thermostat, this means it is activated and deacti-
vated automatically.
- This system prevents the escape of vapours and the
water consumption is reduced to a minimum.
- In the version VII,VIII and X the waste air quenching
system can be activated or deactivated. Installing the
appliance under a steam extraction hood, saves on
water.
- It is forbidden to connect the pipe of the waste air
quenching system directly to that of the extraction hood.