8
09. 06. 21. Document Number 671786
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC75 & 85 (AS Control)
Installation Manual
If the control is rotated to aid connection of cables, please ensure that
sufficient flexibility is provided in the final connection run.
To avoid conflict with the unit access panels, it is recommended
that electrical and plumbing service connections to the unit are run
at 90 degrees to the main air flow axis.
Control circuit connections must be segregated (i.e. routed separately)
from power connections.
The unit rating label shows the maximum electrical load of the
equipment. Connections to the unit may include single phase supply
connections, and a variety of control circuits.
Only the prepared apertures in the unit casing may be used for cable
entry. Do not drill or cut the unit casing for this purpose.
The equipment must be earthed and earth-bonded. Means of local
isolation for maintenance purposes are generally required (by others).
Ensure that all mains connections are isolated.
Heat recovery components and modules that incorporate cooling
coils may produce condensation during use. An insulated drip tray and
condensate pump is provided. The drain connection must be connected
to a suitable drainage point (Figures 10 & 11).
6.1 Condensate Pump
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.
Maximum flow rate = 12 l/h
Maximum head = 20m Vertical, 100m Horizontal
Pipe Connection size (Condensate) XBOXER XBC = 8 mm
6.2 Pre-Commissioning
Not all of the components listed here are necessarily included with
the equipment supplied.
10
Customer Connections (Control Side of Horizontal Unit)
LPHW or electric heater
supply connections
Control box
Access to condensate
tray and pump
Condensate drain
connection Ø 8mm push-fit
6.2.1 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.
11
Customer Connections (Control Side of Vertical Unit)
LPHW or electric heater
supply connections
Control box
Access to condensate
tray and pump
Condensate drain
connection
Ø 8mm push-fit
Fixed panel for
customer connections
6.2.2 Heating Coils LPHW
Observe the Flow and Return connection labels on the unit. Drain and
bleed valves are located on the coil. 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.
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).
6.2.3 Electric Heaters
Heater Capacity: XBC75 – 3ph, 12Kw
XBC85 – 3ph, 18Kw
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).
