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21
40
5
50
5
60
5
Relative
humidity %
70
5
80
5
90
6
If the valves are not installed, there could be abundant con-
densation, especially if the unit is not operated for long pe-
riods of time.
During wintertime periods of quiescence, drain water from the
system, to prevent ice from forming. If anti-freeze solutions are
used, check for their freezing point using the table below.
Freezing
% Glycol by weight
temperature (°C)
0
10
20
30
40
Electrical connections
Make the electrical connections whilst the power supply is
disconnected, in accordance with current safety regulations,
carefully following the wiring diagram and its legend.
Check that the mains electricity supply is compatible with the
voltage shown on the unit rating plate.
C
NOTE:
The electrical connections indicated must be made
by the installer.
For each fan coil a switch (IL) should be mounted on the power
supply, with opening contacts at a distance of at least 3 mm and
a suitable protection fuse (F).
For the electrical connections of the controls, follow the dia-
grams in the figures from: p. 110.
B
WARNING! Cassette is predisposed for standard control
FWEC1A-2A-3A, for FWEC2T disconnect the gray wire of the
float from terminal 4 and connect to free terminal 8, remove
the blue bridge between terminals N and 4, then complete
the connections of the FWEC2T to the terminal board as in
the wiring diagrams:
Ū p. 113 for FWH-A 02-03;
Ū p. 114 for FWH-A 04;
Ū p. 115 for FWH-A 06-07-08;
B
CASSETTE is predisposed for standard control FWE-
C1A-2A-3A, for FWEC4T disconnect the gray wire of the float
from terminal 4 and connect it through a flying terminal to
terminal 3 of the FWEC4T, remove the blue bridge between
terminals N and 4, then complete the connections of the
FWEC4T to the terminal board as in the wiring diagrams:
Ū p. 116 for FWH-A 02-03;
Ū p. 117 for FWH-A 04;
Ū p. 118 for FWH-A 06-07-08;
A
WARNING:
The power supply to the pump-float switch de-
vice must never be interrupted.
Control dedicated (FWEC2T/4T - FWECSA - FWEC1A-
2A-3A
Controls implement a logic that makes it possible to set a
fixed speed between minumum, medium and maximum, or
28
FWH-AT/AF
Fan coil with valve
Air temperature dry bulb (°C)
23
25
27
29
5
5
5
5
5
5
5
5
5
5
5
7
5
6
8
9
6
8
10
12
8
10
12
14
Capacity
Pressure drop
adjustment
adjustment
0
1,00
-4
0,97
-10
0,92
-16
0,87
-24
0,82
automatic speed modulation.
The automatic logic varies the analog signal to the motor be-
tween minimum, medium and maximum speed, based on the
31
33
distance from the set-point, in order to accelerate the imple-
5
5
mentation phases.
6
8
9
11
» Cooling
11
13
14
16
16
18
min
1,00
1,05
» Heating
1,10
1,15
1,20
max
Hydraulic connections
Unit
FWH02ATN,FWH03ATN, FWH04ATN(2
pipes)
FWH06ATN,FWH07ATN,
(2 pipes)
FWH02AFN,FWH03AFN, FWH04AFN
(4 pipes)
FWH06AFN,FWH08AFN (4 pipes)
To optimise performance, it is advisable to make the following
connections on the exchanger:
Ū Unit outlet: connection below.
Ū Unit return: connection above.
B
WARNING: While making the connections, hold the water
connections of the unit tightly in place with a hexagonal
wrench or make sure that they do not rotate, in order to pre-
vent the pipes inside the unit from being damaged.
Ū Carefully insulate the inlet and outlet water pipes as well as
max
med
med
min
Exchanger connection
1/2'' gas F
FWH08ATN
3/4'' gas F
Cooling
Heating
1/2'' gas F
1/2'' gas F
3/4'' gas F
1/2'' gas F
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