5
IVEDITI 0121 4880985_00
The units are designed for installation in closed
environments in 'urban’, non-marine atmos-
phere conditions that are not corrosive or dusty.
The following concentrations of the air polluting
factors where the unit must operate must not
be exceeded under any circumstances:
SO
2
< 0.02 ppm
H
2
S
< 0.02 ppm
NO,NO
2
< 1 ppm
NH
3
< 6 ppm
N
2
O
< 0.25 ppm
The unit must not be installed in areas char-
acterised by the presence of flammable gases
or acidic or alkaline substances. Otherwise the
coils and the internal components of the equip-
ment might undergo serious and permanent
damage in terms of corrosion.
Warnings for the quality of water circulating in
the coils. We recommend performing an analy-
sis of the water circulating in the coil focused
on searching for any bacteria (detection of iron
bacteria and micro-organisms that can produce
H2S or chemically reduce sulphates) and the
chemical composition of the water itself to pre-
vent corrosion and encrustations inside the
pipes.
The water circuit must have all the components,
such as for instance relief and drainage systems,
shut-off valves and that the results of the analy-
sis performed suggest are necessary to ensure
suitable water treatment. The water treatment
system must ensure compliance with the follow-
ing chemical and physical parameters:
Total hardness in
mmol/l
l < mmoll/l < 1.5
Chlorides [CL
-
]
< 10 mg/litre
Sulphates [SO
4
2-
]
< 30 mg/litre
Nitrates [NO
3
-
]
= 0 mg/litre
Dissolved iron
< 0.5 mg/litre
Dissolved oxygen
4 < [O
2
] < 9 mg/litre
Carbon dioxide [CO
2
]< 30 mg/litre
Resistivity
20 Ohm∙m < Resistivity < 50 Ohm∙m
pH
6.9 < pH < 8
OPERATING ENVIRONMENT
C/F
C
VC/F
VC
C/F
C
VC/F
VC
SA
VC/F
VC
SA
VC/F
SA
C/F
VC/F
SA
C/F
SA
C/F
SA
SW
VC/F
VC
SA
SW
VC/F
VC
SA
C/F
C
SW
VC/F
C/F
VC/F
SA
SW
C/F
SA
SW
C/F
SW
SA
SW
VC/F
VC
SA
SW
VC/F
VC
SA
C/F
C
SW
VC/F
C/F
VC/F
SA
SW
C/F
SA
SW
C/F
SW
SYSTEM EXAMPLES
KEY:
SW
Water temperature probe
VC/F
Valve (Heating / Cooling)
VC
Valve (Heating)
SA
Room temperature probe
H/C
Coil
(Heating / Cooling)
C
Coil
(Heating)
2-PIPE SYSTEM WITH WATER PROBE
HORIZONTAL INSTALLATION
2-PIPE SYSTEM WITHOUT WATER PROBE
4-PIPE SYSTEM WITH WATER PROBE
4-PIPE SYSTEM WITHOUT WATER PROBE
C/F
C
VC/F
VC
C/F
C
VC/F
VC
SA
VC/F
VC
SA
VC/F
SA
C/F
VC/F
SA
C/F
SA
C/F
