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General Instructions
Read these instructions carefully before
installation and use. Keep this manual for
future reference.
The guarantee is only valid if the units
are used in the manner intended by the
manufacturer and in accordance with the
Frico mounting and operating instructions.
Application area
The AR3500 air curtain unit is supplied
without heat, with electrical heating or hot
water coil and is intended for installation
above entrances and smaller doors up to 3.5
metres in height.
AR3500 is recessed in false ceilings above
entrances.
Protection class above false ceiling: IP44,
below false ceiling: IP20
Operation
Air is drawn in from underneath and blown
out downwards towards the entrance so that
it shields the door opening and minimises
heat loss. To get the best curtain effect the
unit must extend the full width of the door
opening.
The grille for directing exhaust air is
adjustable and is normally angled outwards to
achieve the best protection against incoming
cold air.
The air speed is adjusted to the desired
airflow.
The efficiency of the air curtain(s) depends
on the air temperature, pressure differences
across the doorway and any wind pressure.
NOTE! Negative pressure in the building
considerably reduces the efficiency of the air
curtain. The ventilation should therefore be
balanced!
Installation
The air curtain is installed horizontally with
the supply air grille facing downwards as close
to the door as possible, concealed in the false
ceiling.
The only visible part of the unit is the
underside which is level with the ceiling.
The service hatch must be accessible, nothing
19
AR3500
Assembly and operating instructions
should prevent it being fully opened.
The unit is ready for suspension with
threaded rods on its outside. The threaded
rods can also be fixed on the inside of the
unit e.g. when mounted on a solid suspended
ceiling.
For the protection of wider doorways,
several units can be mounted next to each
other.
Minimum distance from outlet to floor for
electrically heated units is 1800 mm.
1. The mounting brackets (4x) are fixed to
the unit during transport. Slacken these off,
turn them around and screw into place on
the unit according to figure 1.
2. Hang up on threaded bars (M8) according to
figure 2a (not included).
3. Adjust the height using the lower nut so
that the frame is on the level of the ceiling.
Lock using the upper nut.
Mounting on threaded bars inside unit.
1. The mounting brackets (4x) are fixed to
the unit during transport. Loosen them and
screw them into place inside the unit in the
intended holes.
2. Hang up on threaded bars (M8) according
to figure 2b (not included). Note that
the brackets are at different heights and
threaded rods shall be of different lengths.
3. Adjust the height using the lower nut so
that the frame is on the level of the ceiling.
Lock using the upper nut.
Electrical installation
The installation, which should be preceded by
an omnipolar switch with a contact separation
of at least 3 mm, should only be wired by a
competent electrician and in accordance with
the latest edition of IEE wiring regulations.
The control system is pre-installed in the
aircurtain with an integrated control card,
(see fig 5).
SIRe is supplied pre-programmed with
quick-release connections.
Modular cables are connected to the control
board Base, by opening the service hatch, as
shown in fig. 3 and 5. See manual for SIRe.
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