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21. 01. 21. Document Number 671661
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC 75 & 85 (ES / BC Control)
Installation Manual
10.0 FROST COIL ANCILLARY (IF SUPPLIED)
All inter-connections between circuit boards, blowers and sensors are
made at the factory. This diagram only shows the essential field wiring
points for clarity.
10.1 LPHW Frost Coils
10.1.1 Wiring
The heater requires a 230V~50Hz single phase supply connection to
power the thermostat and valve actuator. Remove the top cover from
the terminal box by rotating the four fixing screws half a turn, revealing
the terminal block marked LEN.
L
N
Supply
230V ~ 50Hz
L
N
Local isolator (by others)
E
0
Heater Temperature
Setting
-2
+2
-4
+4
-6
+6
-8
+8
-10
+10
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Wiring - LPHW Frost Coil Ancillary
10.1.2 Setting 'Frost Condition' Temperature
The LPHW heater frost coil is only enabled if the frost stat reads a ‘frost
condition’. A ‘frost condition’ temperature adjustment dial is provided
as part of the frost coil controls. The ‘frost condition’ temperature is
easily adjustable from -10 to +10°C by inserting a small screwdriver
into the adjuster aperture and rotating the spindle clockwise or
anticlockwise. It is recommended that the ‘frost condition’ temperature
is set at 4°C.
10.2 Electric Frost Coils
10.2.1 Wiring
The heater requires two connections; the SELV communications cable
link up and the 400V~50Hz three phase supply connection to power
the heater element. Remove the top cover from the terminal box by
rotating the four fixing screws half a turn, revealing the terminal block.
The communications cable (supplied) can now be plugged into the
socket marked Ecosmart NET inside the box. The other end of the SELV
cable should be plugged into the connection box of the associated
supply fan in the system.
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Wiring - Electric Frost Coil Ancillary
0
Setting
-2
+2
-4
+10
-10
Heater Temperature
+4
-6
+6
-8
+8
L1 L2
L3 N
E
L1 L2 L3 N
Isolator by others
400V-50Hz 3ph
Separate supply
required local
to heater
Min
NET Connections for
Ecosmart Devices
NET Connections for
Ecosmart Devices
Max
o
n
SL run
Test
Link wire see note*
0
1
Trickle
ES-CO2
BMS
Connection Input
Signal
0-10V
0V
Ecosmart
Pwr
Standby
Fan 1
Heating
Fan 2
Cooling
Fault
TX
RX
Frost
Extract
E
L
SL
DP
CL
N
N
RET
Damper Connections
Run
Signal
Fault
Signal
Damper Link
Volt Free Relay Contacts
Run Fault
Switch No. 2 on - all others off
ON
EDG
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Wiring - Electric Frost Coil Ancillary SELV Communications Cable
10.2.2 Setting 'Frost Condition' Temperature
The electric heater frost coil is only enabled if the frost stat reads
a ‘frost condition’, the over-temperature cut-out is healthy AND a
24vac fan run signal is received from the main control panel. A ‘frost
condition’ temperature adjustment dial is provided as part of the frost
coil controls. The ‘frost condition’ temperature is easily adjustable from
-10 to +10°C by inserting a small screwdriver into the adjuster aperture
and rotating the spindle clockwise or anticlockwise. Once enabled
the electric heater frost coil will provide its maximum heat output
to achieve the ‘frost condition’ temperature set by the frost stat. It is
recommended that the ‘frost condition’ temperature is set at 4°C.
11.0 CONTROLS
11.1 Test Button
The test button allows the individual blowers within the unit to be
checked for its operation. If the fan is running already, press the button
once to stop the fan, press again to switch on the fan.
The fan will
return to normal operation after 30 seconds.
11.2 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 RED: Heating faulty
Cooling*
Not applicable. See note.
Fault
LED on when a fault is present on unit.
Frost*
Not applicable. See note.
TX
LED on when the controller is transmitting data.
RX
LED on when the controller is receiving data.
*The control panel is common to all the Ecosmart products and will
have indicators for functions that are not available in this particular fan.
However these indicators will not be illuminated.
