13
5 Electrical
work
The unit is supplied with a 2.5 m cable with plug.
The cable comes out of the top of the unit and is connected to
a 230 V 50 Hz single-phase earthed power point that is placed
in an easily accessible position close by. The power plug shall
be used as the service switch. See chapter 12 for fuse sizes.
The control panel is adapted for concealed installation over
a
single
connection box, or surface installation on the wall.
The unit has a low-voltage cable (with joint) that is intended for
the control panel. It is important that this plug is easily accessible
afterwards for possible faults, or when changing the unit.
The low-voltage cable is enclosed in the control panel
packaging.
You’ll find the control panel in a box in the ventilation unit
packaging. The low-voltage cable must be laid between the
unit and the switch unit. See chapter 15 about automatic
control.
5.1 Temperature sensor for heating (B1) (if the
unit has a water battery)
This shall be placed in the supply air duct (red on Flexit
drawing/Symbol use page 3) approx. 1 m from the water
battery. Roll out the marked coil of cable on the unit near
the supply air duct. Drill a Ø 7 mm hole in the duct where the
sensor can be inserted. Tighten the hole with acrylic sealant
and tape the cable in place on the outside of the duct so
that it stays in place.
See wiring diagram enclosed with the unit.
6 Plumbing
work*
*If the unit shall have heating with water battery.
All plumbing work must be performed by an authorised
plumber. Place the unit close to a gully to avoid damage
caused by any water leaks.
UNI 4 Installation Instructions
5.2 Frost sensor for water battery (B5) (if the
the unit has a water battery)
To avoid frost in the battery a water battery sensor (B5) must
be installed in the water battery pipe where the cold water
leaves the battery.
See wiring diagram enclosed with the unit.
5.3 Outdoor air damper (if the unit has a water
battery)
To avoid frost damage to the water battery during downtime/
loss of power, a closing air damper must be installed on the
outdoor air duct. The damper motor must have a spring so
that it closes when power is stopped.
CAUTION!
The unit should be installed with an
earth fault breaker. All electrical connections
must be installed by qualified electricians.
!
NB!
Temperature sensor B1 must be posi-
tioned after the water battery.
NB!
The low-voltage cable must be laid a
minimum of 30 cm from cables carrying mains
voltage or higher, and shall be pulled through
20 mm conduit pipe when installed. The cable
length must not exceed 24 meters.
Positioning must accord with individual
countries' electrical safety legislation. Check
which rules apply in your country.
NB!
Ensure that the plug for the unit is not
boxed in.
