10
09. 06. 21. Document Number 671786
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC75 & 85 (AS Control)
Installation Manual
6.4 Filter Pressure Switch
XBC 75 & 85 units come with pre fitted pressure tappings and tubing
for use with the fitted dirty filter alarms on both the supply and extract
air streams. The IP54 pressure switch is equipped with a red visual LED
alarm which will illuminate when the pressure reading surpasses that
set by the adjustable knob.
6.4.1 Setting Switch Pressure
Make certain that there is no voltage on the electrical connections
before you carry out any setting on the pressure switch, there is the
possibility of an electric shock if you accidentally touch live parts.
Nuaire recommend the pressure switch be set to trigger when the
filters experience a 125 Pa increase above the clean filter resistance for
the largest commissioned airflow rate. Use the adjustment dial to set
the pressure at which the switch will trip. When the pressure falls below
this set value, the switch returns to its resting position.
6.4.2 Switch Wiring
The cable gland is designed for cables with alternative sheath diameters
of 7 mm or 10 mm. Only use these sizes, otherwise the screw cable
connection cannot seal adequately. The connections are intended for
6.3mm crimp-type sockets.
Remove switch cover. Wire the main unit to the terminal block within
the switch as per the below wiring diagrams (Figure 14) ensuring the
feed line is fused to suit Max 1.5A / 250 Vac. Refit switch cover.
14
Switch Wiring
Schematic Diagram
Pressure Sensor Internals
2 - NO
3 - C
1 - NC
3 - C Contacts 2 - NO
when the difference between
positive & negative pressure
is equal to the set pressure.
Customer 240 V
Connection
Customer 240V
Connection
Internal Connection
Customer Connection
*Note 1: NC has been
blanked off.
*Note 2: Pressure setting
of 125Pa above clean filter
pressure is recommended.
*Note 3: If a different
arrangement is required,
then the internal LED con-
nections can be removed.
240 V
Indicator
240 V
Indicator
Sensor Diagram
2 - NO
1 - NC
*Note 2
*Note 3
*Note 1
Differential
Pressure
Setting
3 - C
