14
21. 01. 21. Document Number 671661
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC 75 & 85 (ES / BC Control)
Installation Manual
11.3 BMS Inputs
The system’s response to a 0-10V dc BMS signal is given in the
following table.
The BMS signal will override any sensors and user
control connected in the system. The voltage tolerance is +/-
125mV and is measured at the fans terminal.
Ventilation
Mode
Cooling Mode* Heating Mode*
Local Control
0.00
-
-
OFF/ Trickle
0.25
-
-
Speed 1
0.50
0.75
1.00
Speed 2
1.50
1.75
2.00
Speed 3
2.50
2.75
3.00
Speed 4
3.50
3.75
4.00
Speed 5
4.50
4.75
5.00
Speed 6
5.50
5.75
6.00
Speed 7
6.50
6.75
7.00
Speed 8
7.50
7.75
8.00
Speed 9
8.50
8.75
9.00
Speed 10
9.50
9.75
10.00
11.4 Settings
11.4.1 Maximum Airflow
•
Ensure the power supply is switched off and that a link wire is
connected from the supply L to the SL terminal. Unplug all items
connected to the ‘Net‘ connectors.
•
Switch on the power supply.
•
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.
11.4.2 Trickle Ventilation Facility
Slide the ‘trickle’ switch 0 = Off, 1 = On. With ’trickle’ on and power
to unit, the fan will run at minimum speed until the switch live signal
activates it to boost.
11.4.3 Minimum Trickle Airflow (Nominal 40%)
•
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’.
•
The minimum setting (nominally 40%) must be below
the maximum setting; otherwise minimum setting will be
automatically set to be the same as the maximum.
11.4.4 Overrun Time
A switched live of 100-230V at terminal SL will activate the fan. When
the switched live signal is removed the fan will overrun for period set
by the dial ‘SL run on’ - adjust the desired overrun time by rotating
clockwise.
11.4.5 'Air Off' Temperature
The adjustment knob is located in the control pack and must be set to
the desired ‘air off’ temperature.
MIN
= Minimum speed
adjustment
MAX
= Maximum speed
adjustment
SL Run on = Switched Live
Run-On Timer
TRICKLE
adjustment
= Selects trickle
1 = selected
running: 0 = off,
TEST
= Test button
LED indicators
Min Max SL run on
Trickle
Test
0
1
Pwr
Standby
Fan 1
Fan 2
Heating
Cooling
Fault
TX
Frost
RX
Connector
Ecosmart
22
Control Board
12.0 MAINTENANCE
It is important that maintenance checks are recorded and that the
schedule is always adhered to, in all cases, the previous report should
be referred to.
Before commencing work, make sure that the unit and Nuaire
control are electrically isolated from the mains supply.
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.
12.1 Routine Maintenance
•
Clean all areas of unit and treat any areas of corrosion.
•
Check all access doors for leakage and if necessary locks should be
adjusted and any replacement gasket materials should be replaced
as required.
•
Any drain trays should be cleaned and repaired if necessary.
12.2 Every 3 Months
•
Check filters and change/clean if required, failure to do so may
impair the performance and energy efficiency of this unit.
Typically filters should be changed when the filters experience a
125 Pa increase above the clean filter resistance for the largest
commissioned airflow rate.
•
Ensure condensate drains are cleaned clear and that water can
flow freely from unit.
•
Check fin coil banks and heat exchangers. If necessary clean with a
soft brush or vacuum. Check for signs of contamination.
12.3 Annually
•
Thoroughly inspect the unit and its components for corrosion,
acting immediately to treat/restore any damaged areas.
•
All electrical terminals within the unit should be tightened.
•
C
heck all earth connections.
•
Check control dampers blades.
•
Check operation of damper actuators and linkages and adjust as
necessary.
•
Coil faces should be inspected and any dust removed.
•
Check any thermal wheel belt, motor, bearings, seals and if
necessary clean with a soft brush or vacuum cleaner.
