Carel GDWBI20A00, User Manual

Page: 44 / 52

20
ENG
+0300046IE - rel. 1.3 - 05.01.2022
4.4 Sensitive element replacement
CAUTION: this product uses semiconductors
that may be damaged by electrostatic discharges
(ESD). When handling the printed circuit board, care
must be taken not to damage the electronics.
4.4.1 Overview of the components
“A”
sensor PCBA, TYP
Fig. 4.c
Sensitive element diagram, with overview of the ribbon
cable connector for connection to the main board (“A”).
No. Component description
1 Main printed circuit board
2 RJ45 printed circuit board module
(only for the remote version)
3 Main enclosure
4 M16 cable gland
5 M20 cable gland
6 Removable cover
7 Sensor module
8 Polycarbonate
Tab. 4.i
8
6
1
7
2
4
3
5
see detail “A”
Fig. 4.d
4.4.2 Sensitive element replacement
CAUTION: this product uses semiconductors that may be
damaged by electrostatic discharges (ESD). When handling the printed
circuit board, care must be taken not to damage the electronics.
Inspection by trained service personnel.
To replace the gas detector sensitive element:
1.
Power off the gas detector.
2. Using a 5/32 (4 mm) hex/Allen key (not included), remove the cover
and disconnect the ribbon cable from the sensor module.
3.
Remove the sensitive element installed on the cover by holding the
housing and turning it 90° anticlockwise. Be careful not to apply
excessive force to the sensor module board. When the square tab on
the sensor housing is aligned with the padlock icon, pull the module
fi rmly to remove it from the housing.
4. Install the new sensitive element by aligning the square tab with
the lock icon before pressing it fi rmly into the enclosure. Taking care
not to apply excessive force to the sensitive element board, turn the
module clockwise 90° (or until the triangle icon is aligned with the
padlock icon on the cover).
5.
Connect the ribbon cable to the sensor module and main board and
close the cover. To reconnect the ribbon cable, see the following
instructions to ensure the correct polarity of the ribbon cable.
6.
Make sure the gasket is properly aligned and tighten the cover using
the hex key. Tightening torque must be uniform and no more than
hand tight.
7. Power on the gas detector.
8.
At the end of the start-up sequence, check the sensor response
(bump test).
4.5 Cleaning the device
Clean the detector with a soft cloth using water and a mild detergent.
Rinse with water. Do not use alcohol, degreasers, sprays, polishes,
detergents, etc.