Commissioning And Setting To Work - NuAire XBOXER XBC Series Installation, Operating And Maintenance Instructions

XBOXER XBC ECOSMART ADAPT (TREND) CONTROL (AT)

13.0 Commissioning and Setting to Work

(Note – not all of the components listed here are necessarily
included with the equipment supplied).
13.1 Filters
Remove filter access panels (observe and note airflow direction labels),
inspect filters for contamination with construction debris, replace as
necessary. Replace access panels.
Filter pressure drops will depend on actual flow rate and condition.
Observe and record filter pressure drops after performance
commissioning. Typically, filter "dirty" condition occurs when the initial
filter "clean" readings have been increased by 125Pa.
If filter manometers, pressure switches or indicators have been fitted,
they should be set or adjusted to reflect the commissioned system
operation.
13.2 Heating Coils LPHW
Observe the Flow and Return connection labels on the unit. Drain and
bleed valves are located on the coil (see fig 19). Other valves may be
required in the system pipe-work depending on the installation (by
others).
Where the wet system is at risk of frost damage, the addition of a
proprietary anti-freeze solution to the water is recommended. Note
that any frost protection offered by the unit's integral control system
will not operate if the power supply to the unit is interrupted.
Ecosmart frost protection is activated on any Ecosmart unit fitted with
LPHW heating, when the outlet air temperature is 4ºC or below. The
unit reacts by shutting down the fan to prevent a 'wind chill' effect
reducing the temperature to a point whereby the coil could freeze
and burst. The unit will also drive open the LPHW valve to a fully open
position to allow full water flow through the coil and the main PCB
will close the 'Heat demand' contacts. These contacts could be used to
send a signal to activate the boiler and/or valve to open to provide heat
if not already doing so.
Piped connections should be made to the unit using appropriate
techniques, and all pipework must be independently supported. No hot
work is permitted within one metre of the unit.
Figure 14. Customer connections. Control side of horizontal
unit, showing coil and condensate connections.
LPHW or electric heater
supply connections
Control box
Condensate drain
connection Ø 8mm push-fit
CONDENSATE ALARM
The condensate pump incorporates an alarm function.
If the water level in the condensate tray exceeds a maximum level (for example, as a result of the discharge tube becoming blocked
or frozen), the alarm contact will open. This contact is internally connected to the heat exchanger bypass actuator, and the unit will
automatically be placed into bypass mode, preventing further condensate production. Unit operation will otherwise be unaffected.
nuaire.co.uk 029 2085 8200
Ensure that installed pipework runs do not prevent or restrict access to
the unit at any point.
The completed installation (including the connections within the unit,
as these may be disturbed during installation) shall be pressure tested
to the project engineer's specification (This is a condition of the unit
warranty).
13.3 Electric Heaters
Heater Capacity: XBC75 – 3ph, 12Kw
The Electric Heater requires a 3ph supply which is independent from
the main unit supply. Connections to be made through the low level
fixed panel. The Electric Heater may be withdrawn to allow access to
the Heater Controller without the need for wiring to be disconnected
(Ensure the mains supply is isolated before removing any access panels
and any adjustments are made to the Heater Controller).
13.4 Fan Sections
Access to the fan section is via lift off panels (see fig. 1 & 19).
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.
Figure 15. Customer connections. Control side of vertical
unit, showing coil and condensate connections.
Access to condensate
tray and pump
XBC85 – 3ph, 18Kw
Control box
LPHW or electric heater
Access to condensate
supply connections
tray and pump
Fixed panel for
customer connections
Condensate drain
connection
Ø 8mm push-fit