9
09. 06. 21. Document Number 671786
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC75 & 85 (AS Control)
Installation Manual
6.2.4 Fan Sections
Access to the fan section is via lift off panels. For non-Ecosmart units,
wiring to the fan motor / unit terminal box should be mechanically
protected and in made in accordance with the details on the motor
name plate and diagram attached to the unit.
With the unit electrically isolated, rotate the fan impeller / drive
manually, checking that it spins freely.
Check all fixings are secure.
Units must not be operated without all access panels in place – damage
to equipment or injury to personnel may result. Units must not be
operated unless control interlocks are in place – damage to equipment
may result.
Test run motor for condition and correct rotation. Check that the
correct current overloads are fitted and that the current being drawn
does not exceed the motor nameplate value. Excessive current
normally indicates that the ductwork system resistance is different to
design.
6.2.5 Motorised Dampers
If Nuaire matched silencers (Horizontal: XBC75-H-SIL900, Vertical:
XBC75-V-SIL900) are being fitted to the fan unit, the motorised
damper (Horizontal: XBC75-H-MD24V, Vertical: XBC75-V-MD24V )
needs to be fitted after the silencer.
This ensures that breakout noise levels are kept to a minimum.
•
Fully interlocking parallel blades, half inch diameter electroplated
mild steel spindle.
•
Nylatron bushes and external nylon/aluminium blade
interconnection linkage.
•
Fitted with drive open/drive close actuator complete with switch.
•
Motorised damper wiring will require connection on site and
possible extension of the cable looms.
Motorised Damper
drive open/drive close
actuator complete with switch.
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ed
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61
12
Motorised Damper Actuator
6.3 Constant Pressure Range (CP) - Controlling Static
Pressure at Fan Inlet
Ecosmart constant pressure extract fans are supplied to control the
static pressure at the fan inlet.
This set up is suitable for the majority of applications. When ancillaries
with high pressure losses are fitted to the inlet side of the fan, the low
pressure tapping must be moved from the fan chamber to a location
upstream of the ancillaries, as shown below in Figure 13.
Failure to do this will result in excessive pressure being applied to the
dampers at the rooms when the system is running in trickle mode.
13
Typical Constant Pressure Setup
Riser
Ancillaries
Riser
Inlet
e.g. Silencer
Pressure
Balancing
Branch
Damper
Balancing
Branch
Damper
Extract Fan
To atmosphere
Sensor
High Low
Pressure
Flexible tubing
New Pressure Tapping
Airflow
