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To access the connections (DN20, 3/4")
the service hatch and intake grille must be
opened. The unit is supplied through holes on
the upper side or through the side of the unit.
The connections to the heating coil must be
equipped with shut off valves to allow problem
free removal.
Adjustment of the air curtain and air flow
The direction and speed of the air flow should
be adjusted considering the load on the
opening. Pressure forces affect the air stream
and make it bend inwards into the premises
(when the premises are heated and the
outdoor air is cold).
The air stream should therefore be directed
outwards to withstand the load. Generally
speaking, the higher the load, the greater the
angle that is needed.
Basic setting fan speed
The fan speed when the door is open is set
using the speed control. Note that the air flow
direction and speed may need fine adjustment
depending on the loading of the door.
Filter (AR300W)
The heat coil fin distance, in combination
with the hole diameter of the intake grille,
protects against dirt and blockage and makes
a separate filter unnecessary.
Service, repairs and maintenance
For all service, repair and maintenance first
carry out the following:
1. Disconnect the power supply.
2. The service hatch is opened by slackening
off the screws on the underside of the unit.
Maintenance
Since fan motors and other components are
maintenance free, no maintenance other than
cleaning is necessary. The level of cleaning
can vary depending on local conditions.
Undertake cleaning at least twice a year. Inlet
and exhaust grilles, impeller and elements
can be vacuum cleaned or wiped using a
damp cloth. Use a brush when vacuuming
to prevent damaging sensitive parts. Avoid
AR 300 E/W
the use of strong alkaline or acidic cleaning
agents.
Overheating
The air curtain unit with electric heater is
equipped with an overheat protector. If it is
deployed due to overheating, reset as follows:
1. Disconnect the electricity with the fully
isolated switch.
2. Allow the electrical coil to cool.
3. Determine the cause of overheating and
rectify the fault.
Reset is performed as follows:
1. Locate the red button inside the air curtain
unit. It is visible and accessible by opening
of the service hatch and inlet grille. The
button is on the left side seen from inside
the room looking out. On the 2 metre
variant, two red buttons are installed in the
middle of the unit.
2. Press the red button until a click is heard.
3. Connect the air curtain again.
All motors are equipped with an integral
thermal safety cut-out. This will operate,
stopping the air curtain should the motor
temperature rise too high. The cut-out
will automatically reset when the motor
temperature has returned to within the
motor's operating limits.
Fan replacement
1. Determine which of the fans is not
functioning.
2. Disconnect the cables to the relevant fan.
3. Remove the screws securing the fan and lift
the fan out.
4. Install the new fan as above in reverse
order.
Replacing the electric coil (AR300E)
1. Mark and disconnect the cables to the
electric coil.
2. Remove the mounting screws securing the
coil in the unit and lift the coil out.
3. Install the new coil in reverse order to the
above.
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