During Operation; Operating Limits - AERMEC Omnia ULI 16 C Manuel D'utilisation Et D'installation

DURING OPERATION

Always leave the filter fitted on the fan coil during operation
(otherwise dust in the air could soil the coil surface area).
IT IS NORMAL
In cooling mode, water vapour may be present in the air deliv-
ery of the fan coil.
In the heating function it might be possible to hear a slight hiss
around the fan coil. Sometimes the fan coil might give off
unpleasant smells due to the accumulation of substances in the
air of the environment (especially if the room is not ventilated
regularly, clean the filter more often).

OPERATING LIMITS

Maximum water input temperature
Maximum operating pressure
The assembly site must be chosen in such a way that the maxi-
mum and minimum ambient temperature limits are respected
0÷45°C (<85% U.R.).
Minimum average water temperature
To avoid condensate on the external structure of the device
while the fan is functioning, the average temperature of the
water must not be lower than the limits shown in the table
below, that depend on the thermo-hygrometric conditions of
MINIMUM AVERAGE WATER TEMPERATURE Temperature of the air in the room with dry bulb °C
Temperature of the wet bulb
of the air in the room °C
OPERATING ENVIRONMENT
The units are designed for installation in closed environments in conditions
of 'urban', non-marine atmosphere with non-corrosive and non-dusty
characteristics.
Under no circumstances the following concentrations of pollutants in the air, in
which the unit must operate, shall be exceeded:
SO <0,02 ppm
2
H S <0,02 ppm
2
NO,NO <1 ppm
2
NH <6 ppm
3
N O <0,25 ppm
2
The unit should not be installed in locations characterized by the presence of
flammable gases or acidic or alkaline substances.
Otherwise the coils and the internal components of the equipment could suffer
serious and irreparable damage from corrosion.
16
80 °C
8 bar
21
15 3
17 3
19 3
21 6
23 -
While the unit is functioning, there could be noises and creaks
inside the device due to the various thermal expansions of the
elements (plastic and metal), but this does not indicate any
malfunction and does not damage the unit unless the maximum
input water temperature is exceeded.
WARNING
Make sure the equipment cannot be used by children or
disabled people without suitable supervision; remember also
that the equipment must not be used by children as a toy.
the air in the room.
These limits refer to unit operating with fan at minimum speed.
In the event of prolonged fan inactivity and with cold water
passing through the coil, condensate may form on the external
case of the unit. As a result, we recommend including the
3-way valve accessory.
23 25
3 3
3 3
3 3
5 4
8 7
WARNINGS FOR THE QUALITY OF THE WATER
CIRCULATING IN THE COILS
It is recommended to perform an analysis of the water circulating in the coil
focusing on the research of the possible presence of bacteria (detection of
iron bacteria and micro-organisms that can produce H2S or chemically reduce
sulphates) and on the chemical composition of the water, to prevent corrosion
and fouling inside the tubes.
The water circuit must be supplied and replenished with treated water that does
not exceed the threshold levels indicated below.
Total hardness in mmol/l l < mmoll/l < 1,5
-
Chlorides [CL ] < 10 mg/litre
2-
Sulphates [SO ] < 30 mg/litre
4
-
Nitrates [NO ] = 0 mg/litre
3
Dissolved iron < 0,5 mg/litre
Dissolved oxygen 4 < [O
Carbon dioxide [CO ] < 30 mg/litre
2
Resistivity 20 Ohm∙m < Resistivity< 50 Ohm∙m
pH 6,9 < pH < 8
27 29
3 3
3 3
3 3
3 3
6 5
] < 9 mg/litre
2
31
3
3
3
3
5