Airflow DV 90 SE R Petunjuk Penggunaan dan Pemeliharaan Manual - Halaman 15

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SYMPTOM

"Bus fault" message is

displayed and the unit

operates at speed 1

(check the fan speed).

"Freezing alert" message is

displayed and the unit is

stopped.

The desired automatic

adjustment does not stay

on.

The unit does not work, the

fans are not running and no

indicator light is lit in the

control panel.

The unit does not obey the

control panel.

"Carbon dioxide alarm"

message is displayed and the

unit is stopped.

The filter guard symbol

( ) is displayed and the

unit operates otherwise

normally.

After a power failure, the unit starts at minimum fan speed.

All the other selected adjustments and setpoints remain in the memory of the unit.

DV 90 SE

REASON

• Wiring fault in the carbon dioxide sensor,

in the control panel or in the humidity sen-

sor.

• Antifreezing of the water-circulating ra-

diator is active (not in the DV 90 SE unit).

NOTE! If there is no non-freezing solution in the

water of the radiator, the radiator is at risk of

freezing.

• There is a fault in the humidity or carbon

dioxide sensor. One of the sensors is bro-

ken or missing.

• The door switch may be broken, or the

door is possibly not quite closed.

• The unit is out of power, e.g. because a

fuse has blown.

• The glass tube fuse (located in the control

card behind a protecting plate) the electro-

nics inside the unit may have blown.

• Carbon dioxide alarm. Carbon dioxide

content has exceeded 5000 PPM for more

than two minutes. May be caused by a

fire.

• The pressure in the filter guard (pressure

difference switch) has risen above the ad-

justment value or speed is 7 or 8.

TROUBLESHOOTING

DO THIS

• Contact a maintenance company. The connections have to

be checked and corrected if necessary.

• Immediately troubleshoot the situation. Find out from a main-

tenance company if there is non-freezing solution in the

radiator. Check if the circulation pump is broken, the boiler

out of operation, etc. The situation may pass by itself as

soon as supply air temperature exceeds 10 degrees, but do

not wait till it happens.

• Contact a maintenance company. The sensor installation

and connections have to be checked. (The sensors are optio-

nal.)

• Check the door switch and fuses. The unit includes a T800

mA glass tube fuse.

• If needed, contact a maintenance company (e.g. to check

the glass tube fuse)

• Disconnect the plug of the unit from the wall socket, wait for

30 seconds and put the plug back. If this does not help,

contact a maintenance company.

• If there is a fire, take the necessary steps. You can make the

unit operative by disconnecting the plug from the wall

socket, waiting for 30 seconds and putting the plug back

again.

• Check the cleanliness of the filters and the unit. If needed,

clean or replace the filters. Also check the external grille.