9
Isolation - Before commencing work make sure that the unit and
Nuaire control are electrically isolated from the mains supply.
Warning - Inverter Speed Control
An Inverter is used to provide speed control. When the fan is
isolated, allow 5 minutes for the capacitors in the inverter to
discharge before commencing any work on the unit.
17. 06. 15. Leaflet Number 671424
Installation, Operating and Maintenance Instructions
XBOXER Run Around Coil
5.7 Electrical – Ecosmart Units
Commissioning panel - Using the Test button
The panel is located within the control enclosure – one for each
fan.
The test button allows the fan within the unit to be checked for
correct operation. If the fan is running already, press the button
once to stop the fan, press again to switch on the fan.
Note that the fan will return to normal operation after
30 seconds.
LED Indication
PWR GREEN:
Power on & OK,
Standby LED
on when fan is not running.
Fan 1 GREEN:
Fan 1 is running, RED: Fan 1 faulty.
Fan 2 GREEN
: Fan 2 is running, RED: Fan 2 faulty.
Heating* GREEN:
Heating selected
Cooling* GREEN:
Cooling selected
Fault:
LED on when a fault is present on unit.
Frost* RED:
Frost condition exists
Tx LED
on when the controller is transmitting data.
Rx LED
on when the controller is receiving data.
* Note that this control panel is common to all the Nuaire
Ecosmart products and may have indicators for functions
that are not available in individual units – however, the unused
indicators will not be illuminated.
5.8 Settings
Setting the maximum air flow
i) Ensure the power supply is switched off and that a linkwire is
connected from the supply L to the SL terminal. Unplug all items
connected to the ‘Net‘ connectors.
ii) Switch on the power supply.
iii) Wait for the fan to complete its self-test operation.
Measure the airflow using standard commissioning instruments at
a suitable point in the ductwork.
If adjustment is required, rotate the pot marked ‘MAX’ to obtain
the desired airflow. Remove the link wire if not required.
Setting the minimum/trickle airflow rate
(Nominally 40% for S6 units and 20% for all others as
standard).
i) Repeat the same procedure as for maximum airflow above but
without the link wire between supply L and SL terminal.
Ensure the trickle switch is in the ‘ON’ position. Adjustment must
be made on the pot marked ‘Min’.
ii) Note that the minimum setting (nominally 40%) must be below
the maximum setting, otherwise the minimum setting will be auto-
matically set to be the same as the maximum.
iii) The minimum speed set is the trickle speed at which the fan
operates.
Note: The working adjustment of the fan speed by user control
and sensors, ranges between the minimum and maximum set
points.
Note :- Where third party controls are specified and fitted, ref-
erence should be made to the control specification and operat-
ing instructions.
It is the installer’s responsibility to ensure that such controls
are suitable for operation with the Nuaire equipment.
Nuaire will accept no liability for equipment damage resulting
from incompatible controls.
Mechanical
i) Wet systems require the setting of the coil bypass balancing
valve, set using general commissioning procedures - refer to the
specified design flow duties and any documentation attached to
the valve.
6.0 Maintenance
It is recommended that PPE is always used during the maintenance
of Air Handling Equipment – gloves, eye shields and respiratory
mask.
In some Ecosmart units and in some third party controls, variable
speed drives (inverters) are used to provide fan speed control.
After the fan is isolated, allow at least 5 minutes for the capacitors
in the inverter to discharge before commencing any work on the
unit.
6.1 Dampers
At regular intervals check that the blades move freely.
6.2 Filters
Disposable filters should be changed when fully dust laden.
Washable filters should be removed when fully dust laden and
washed in mild detergent, flushed with clean water and allowed to
dry before replacing.
Carbon filters should be replaced once carbon activation is
exhausted.
Inclined gauge manometers, where fitted, should be checked for
fluid level.
6.3 Heating and Cooling Coils
Coils should have their finned surface examined for accumulation
of dirt, lint and biological contaminants or similar. If necessary,
wash down affected areas with a mild detergent solution and
a soft brush. Care should be taken not to damage the finned
surface, and any cleaning fluids should be rinsed away with water.
A compressed air line may be used to blow out any solids between
fins. Do not probe the coil fin block with metal objects as damage
may cause leaks.
Drain lines should be checked to ensure that they are unobstructed
and free draining. Traps should be checked that they are fully
primed and functioning.
Drain pans should be flushed out periodically to remove
contamination.
Note: The unit application may require particular attention to
this item – Check with Building Management personnel for
details.
MIN
= Minimum speed adjustment
MAX
= Maximum speed adjustment
SL
Run on
= Switched Live Run-On
Timer adjustment
TRICKLE = Selects trickle running:
0 = off, 1 = selected
TEST
= Test button
LED indicators
Min Max SL run on
Trickle Test
0 1
Pwr
Standby
Fan 1
Fan 2
Heating
Cooling
Fault
Frost
Tx
Rx
Ecosmart
C
o
n
n
e
c
t
o
r
Figure 21.
