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condensation may also form on the unit's exterior. In this case it is advis-
able to install the 3-way (or 2-way) valve accessory in order to stop the
flow of water in the coil when the fan is stopped.
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 with the power supply disconnect-
ed, in accordance with current safety regulations, and following the
base wiring diagram from p. 60 and pertinent legend p. 16.
NOTE: the electrical wiring must always be positioned on the oppo-
site side of the plumbing connections.
Check that the mains electricity supply is compatible with the voltage
shown on the unit rating plate.
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 pro-
tection fuse (F).
Characteristic of inverter control
The requested curve set point can be carried out at the factory (and
amended on site if necessary) by setting the dip switches, as in the dia-
gram below:
N°
Maxiumum speed
1
1550 rpm
2
1450 rpm
3
1350 rpm
4
1250 rpm
5
1150 rpm
6
1050 rpm
7
950 rpm
8
850 rpm
16
FWZ / FWR / FWS
Capacity
Pressure drop
adjustment
adjustment
0
1,00
-4
0,97
-10
0,92
-16
0,87
-24
0,82
DIP 1
DIP 2
DIP 3
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
1,00
1,05
1,10
1,15
Note: the maximum speed (1550 rpm) isn't usually used.
1,20
General wiring diagrams legend
Ū IL: Circuit breaker (not supplied)
Ū F: Safety fuse (non supplied)
Ū CN: Fast on/screw terminal board
Ū MVI: Fan motor + built-in inverter
Ū EMC FILTER: EMI/RFI noise filter
Ū BN (L2): Brown = phase filter IN
Ū BU (N4): Blue = filter IN neutral
Ū BK (U1): Black = filter OUT phase
Ū BU (U3): Blue = filter OUT neutral
Ū VC: ON/OFF cold/hot water valve 2 pipes system (accessory)
Ū ON/OFF cold water valve 4 pipes system (accessory)
Ū VH: hot water valve 4 pipes system (accessory)
Ū BN: Brown = valves power supply phase
Ū BU: Blue = neutral valve power supply
Ū SAI: Pre-installed internal air temperature probe
Ū SAE: Remote air temperature probe (accessory)
Ū SW: Remote air temperature probe (accessory)
Ū SWH: Hot water temperature probe additional coil (4-pipe units).
Available in option only with SW.
Ū SUI: Pre-installed internal air relative humidity probe
Ū SUE: Remote air relative humidity probe (accessory)
Ū SC: Relay box + Electrical heating element terminal box
Ū RE: Electrical heating elements
Ū TSA: Safety thermostat
Ū TSM: Safety thermofuse
Ū K: Relay control thermostat
Ū K1: Relay control thermofuse
FWECSA control electrical wiring diagram legend
Ū T1: Transformer 230Vac/24Vac (not supplied)
Ū VC 0-10: modulating cold water 2 pipes system (accessory)
Ū Modulating cold water 4 pipes system (accessory)
Ū VH 0-10: Hot water valve modulating 0/10V 4 pipes system (acces-
sory)
Ū RD: Red = + 24V valves power supply
Ū BK: Black = 0V valve power suppliy / control signal GND
Ū grey: Grey = 0-10 Vdc valve control signal for modulating
4.2
MOUNTING BASE UNIT AND COVER CABINET
DIP 4
Upon receipt of the unit, check the integrity of the package:
Ū Remove the air filter unscrew the 2 fastening screws 11.11 p. 58
-
for FWZ. For FWR remove filter unscrew the 2 screws on frontal grill
-
11.10 p. 58.
-
Ū Remove the cabinet by unscrewing the 4 fastening screws reachable
-
through the lifted side doors on the upper grill. 11.5 p. 56.
-
Ū Remove the protecting spacers (useful for transport only) from the
cabinet sides.
-
Ū Install the unit at distances from the walls shown in dimensional
-
drawing from figure p. 53.
-
Ū Leave the cabinet inside the packaging and proceed with the instal-
lation of the base unit to the wall using the 4 slots provided and the
screw anchors suitable for the characteristics of the supporting wall,
keeping the bottom edge at least 100 mm above the floor to ensure
a correct intake of air and facilitate the filter removal for versions
FWZ / FWS.
Ū For the ceiling installation FWZ / FWS make sure that the
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