FRICO AG4520A - Инструкция по эксплуатации - Страница 22

Thermozone AG 450 0/5000 A/W

21

GB  

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. 
Approximately  15° is a suitable angle. 
Generally speaking, the higher the load, the 
greater the angle is needed.

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.

Filter

The distance between the coil plates 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 first opening 

the intake grille and then slackening off 
the screws in the underside of the unit, as 
illustrated on page 3.

Maintenance

Since the fan motors and other components 
are maintenance free, no maintenance other 
than regular cleaning is necessary. This can 
vary depending on local conditions, however 
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

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 in reverse order to the 

above.

Replacing the water coil

1. Shut off the water supply to the unit.
2. Disconnect the connections for the water 

coil.

3. Remove the mounting screws securing the 

coil in the unit and lift the coil out.

4. Install the new coil in reverse order to the 

above.

Draining the water coil

The drain valve is on the underside of the coil 
on the connector side. It can be accessed via 
the service hatch.

Trouble shooting

If the fans are stationary, check the following:
1. Operating power supply to the unit; check 

fuses, circuit-breaker, time switch (if any) 
that starts and stops the unit.

2. That the airflow selector is correctly set.
3. That the door contact is working (if 

installed).

4. That the overheat protection for the motors 

has not been deployed.

5. That the intake grille is not dirty.