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4.3
Preparing water piping
The unit is equipped with a water inlet and water outlet for
connection to the water circuit. The water circuit must be provided by
an installer and must comply with the applicable legislation.
Before performing the water piping work, check the following points:
▪ The maximum water pressure is 1.6 MPa.
▪ The minimum water temperature is 5°C.
▪ The maximum water temperature is 90°C.
▪ Be sure to install components in the field piping that can withstand
the water pressure and temperature.
▪ Provide adequate safeguards in the water circuit to ensure that
the water pressure will never exceed the maximum allowable
working pressure.
▪ Provide a proper drain for the pressure relief valve (if installed) to
avoid any water from coming into contact with electrical parts.
▪ Provide shut-off valves at the unit so that normal servicing can be
accomplished without draining the system.
▪ Provide drain taps at all low points of the system to permit
complete draining of the circuit during maintenance or service to
the unit.
▪ Provide air purge valves at all high points of the system. The
valves shall be located at points which are easily accessible for
servicing.
NOTICE
The unit is ONLY to be used in a closed water system.
Application in an open water circuit can lead to excessive
corrosion of the water piping.
4.4
Preparing electrical wiring
4.4.1
About preparing the electrical wiring
WARNING
▪ ONLY use copper wires.
▪ Make sure the field wiring complies with the applicable
legislation.
▪ All field wiring MUST be performed in accordance with
the wiring diagram supplied with the product.
▪ NEVER squeeze bundled cables and make sure they
do NOT come into contact with the piping and sharp
edges. Make sure no external pressure is applied to the
terminal connections.
▪ Make sure to install earth wiring. Do NOT earth the unit
to a utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shock.
▪ Make sure to install the required fuses or circuit
breakers.
▪ Make sure to install an earth leakage protector. Failure
to do so may cause electrical shock or fire.
NOTICE
The equipment described in this manual may cause
electronic noise generated from radio-frequency energy.
The equipment complies to specifications that are
designed to provide reasonable protection against such
interference. However, there is no guarantee that
interference will not occur in a particular installation.
It is therefore recommended to install the equipment and
electric wires in such a way that they keep a proper
distance from stereo equipment, personal computers, etc.
FWE03~11D
Fan coil units
3P443944-5P – 2021.12
WARNING
All field wiring and components MUST be installed by a
licensed electrician and MUST comply with the applicable
legislation.
DANGER: RISK OF ELECTROCUTION
WARNING
A main switch or other means for disconnection, having a
contact separation in all poles, MUST be incorporated in
the fixed wiring in accordance with the applicable
legislation.
Electrical characteristics
Phase
Frequency
Voltage range
Voltage tolerance
Maximum running current
Overcurrent fuse
Earth leakage circuit breaker
Specifications for field wiring
Wire
(a)(b)
Power supply
H05VV-U3G
wiring
Remote
Sheathed wire 2
(c)
controller and
conductors
unit
transmission
wiring
(a)
Only in case of protected pipes. Use H07RN-F in case of no
protection.
(b)
Run electrical wiring through a conduit to protect against external
forces.
(c)
Use double insulation wire for remote controller (sheath thickness
≥1 mm) or run wires through a wall or conduit so that the user
cannot come in contact with them.
(d)
The length shall be the total extended length in a system with
group control.
5
Installation
5.1
Mounting the fan coil unit
NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit. Make sure that the tightening torque is 3 N•m for all
screws.
5 Installation
FWE-D
1 Ph
50 Hz
220~240 V
±10%
0.46 A
5 A
Must comply with applicable
legislation
Size (mm²)
Length
According to the
—
applicable
legislation ≤4.0
(d)
0.75~1.25
≤500 m
Installation manual
9
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