TREND NuAire XBOXER XBC 75 ECOSMART2, Установка, Подробности Управления, Эксплуатация и Обслуживание, Страница: 16 / 48

029 2085 8200 16
XBOXER XBC ECOSMART2 (NT) MODELS
Isolation - Before commencing work make sure
that the unit, switched live and Nuaire control are
electrically isolated from the mains supply.
Figure 15: Customers connections. Control side of horizontal unit showing coil and condensate connections.
12.0 COMMISSIONING & SETTING TO WORK
ON VERTICAL UNITS
(Note – not all of the components listed here are necessarily
included with the equipment supplied).
12.1 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.
12.2 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.
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.
(A condition of the unit
warranty).
12.3 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 The Electric Heater may be withdrawn to allow access to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).
12.4 FAN SECTIONS
Access to the fan section is via lift off panels. (see fig 15).
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.
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
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.