SECTION 4
MAINTENANCE
The cabinet should be isolated from the electricity supply before carrying
out any maintenance procedures.
FUSES
The two Type T main fuses are located in the mains inlet socket on the top of
the cabinet. To access these, remove the mains lead and pull the tap using a
small screwdriver.
Always replace fuses with the correct type and rating.
LIGHTING
Remove the securing screws and open the front panel to gain access to the
fluorescent tube. The starter is located on the underside of the fitting.
CALIBRATION OF THE LOW AIRFLOW ALARM
This requires the use of a calibrated Ø100mm rotating vane anemometer
and should be carried out by a trained service engineer
.
1) Place the head of the anemometer in the centre of the aperture
supported by a laboratory stand.
2) Remove the black plastic hole plug from the left hand side of the fan
module to gain access to the speed controller and reduce the fan speed
to achieve a face velocity of 0.35m/sec by rotating the potentiometer.
3) Turn off the cabinet and restart whilst pressing the
key.
4) Yellow colour “SET LOW AIR SPEED AND PRESS MUTE” message will
display showing the alarm is in calibration mode. When the airflow has
stabilised to around 0.35m/sec. Press the
key to store the set point.
5) Reset the fan speed to achieve a face velocity of 0.55m/sec.
6) Check operation of the low airflow alarm by raising the lower glazing
panel. The alarm should sound when the panel is raised and stop when
the panel is lowered.
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