Frico Thermozone AG 4000 A Assembly And Operating Instructions Manual page 15

Basic setting fan speed
Set the fan speed using the fan speed controls
so that the air speed 1 metre above the floor
is 3-4 m/s. Note that the airflow direction
and speed may need further fine adjustment
depending on the loading of the door.
Service, repairs and maintenance
For all service, repair and maintenance first
carry out the following:
1. Disconnect the power supply.
NOTE! Units with electrical heaters can be
supplied from more than one connection.
2. The service hatch is opened by first opening
the intake grille and then slackening off
the screws in the underside of the unit, as
illustrated on page 3.
Maintenance
Since fan motors and other components are
maintenance free, no maintenance other than
cleaning is necessary, this can vary depending
on local conditions. Undertake cleaning
at least twice a year. Grille, impeller and
elements can be vacuum cleaned or wiped
using a damp cloth. Avoid 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.
4. Reconnect the power and start the unit.
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.
AG 4000 A/E
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 in reverse order to the
above.
Replacing the electric coil
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
the above.
Trouble shooting
If the fans are stationary, check the following:
1. Operating power supply to the unit;
check fuses, circuit-breaker, time switch/
thermostat (if any) that starts and stops the
unit.
2. That the air flow selector is correctly set.
3. That the position limit switch is working (if
installed).
4. That the intake grille is not dirty.
If there is no heat, check the following:
1. Power supply to electric heater coil; check
fuses and circuit-breaker (if any).
2. That the heat demand exists; check
thermostat settings and actual temperature.
3. That the output selector (if any) is set
correctly.
4. That the intake grille is not dirty.
If the fault cannot be rectified, please contact
a qualified service technician.
Safety cut-out
(applies to units with electric heater)
If the installation is protected by means of a
safety cut-out, which trips when the appliance
is connected, this may be due to moisture
in the heating element. When an appliance
containing a heater element, has not been
used for a long period and is stored in a damp
GB
reverse order to
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