12
09. 06. 21. Document Number 671786
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC75 & 85 (AS Control)
Installation Manual
7.0 ELECTRICAL INSTALLATION
Before commencing work, make sure that the unit, switched live
and Nuaire control are electrically isolated from the mains supply.
The electrical wiring must be carried out by competent persons, in
accordance with good industry practice and should conform to all
governing and statutory bodies i.e. IEE, CIBSE etc.
7.1 Supply
The control is powered by a 400Vac 50Hz 3 phase supply. This must be
isolated local to the unit and fitted with appropriate over-current and
fault protection.
7.1.1 Electric Heater Supply
For models with electric heating, the heating circuit is powered by a
separate, higher current, 400VAC 3ph supply. This must be isolated
local to the unit and fitted with appropriate over-current protection.
The main supply is still required.
Electric Heater models require two separate supplies, each with an
appropriate overcurrent current protection device.
7.2 Volt Free Contacts
Volt free contacts are not fused. If these are used to power any external
equipment, the installer must provide adequate fusing or other
protections.
Volt free relay contacts are rated at 5A resistive, 0.5A inductive.
Run Connections:
The relay is powered when the fan is running
(contacts are used when an I/O damper
is
installed).
Fault Connections
:
No Fault
- The relay is powered.
Fault
- The relay is unpowered.
Heat Demand:
The relay is powered when heating is selected.
Cool Demand:
The relay is powered when cooling is selected.
7.3 Switched Live
Switch Live (SL) terminal
- A signal of 100-230V AC will activate the
switched live signal.
Switch Live 2 Boost (SL2) terminal
- A signal of 100-230V AC will
activate the switched live 2 (Fan Boost) signal.
A signal from an isolating transformer will produce an unpredictable
result and is not recommended.
Volt free versions of the switched live signals are also available at
terminals T33-T34 & T35-T36. Link two contacts to activate the signal.
7.4 Damper Connections
A fan start delay can be imposed to allow the damper time to open and
is adjustable via the strategy.
7.5 Network Settings
Default IP address:
192.168.11.12
Subnet mask:
255.255.255.0
A copy of the strategy is stored in the EDoS (Engineering Data on Site)
portion of memory.
7.6 Connection Chart
Description
TD
Short
Name
Subsystem
Signal
Address
Block
Type
Signal
Type
Unit
Min
Max
Fresh Air Temp
AHU’2Sensors’1FreshAir
1FreshAir
C
1.1
AI
R1K
°C
0
50
Supply Air Temp
AHU’2Sensors’2SupAIr
2SupAIr
C
1.2
AI
R1K
°C
-50
80
Extract Air Temp
AHU’2Sensors’3ExtAir
3ExtAir
C
1.3
AI
R1K
°C
-50
80
CO2 Sensor
AHU’2Sensors’4CO2
4CO2
C
1.4
AI
U10
ppm
0
2000
Fan Speed Cntrl
AHU’2Sensors’5FnSdCnt
5FnSdCnt
C
1.5
AI
U10
%
0
10
Alm Ctritical
AHU’3DigIns’AlmCritC1
AlmCritC1
C
1.6
BI
D20
Nml/Alm
Alm Maintenance
AHU’3DigIns’AlmFitC2
AlmFltC2
C
1.7
BI
D20
Nml/Alm
Enable Hware
AHU’3DigIns’EnaHW
EnaHW
C
1.8
BI
D20
No, Yes
Boost Ena Hware
AHU’3DigIns’BoostHW
BoostHW
C
1.9
BI
D20
No, Yes
OCC PIR Hware
AHU’3DigIns’OccPIR
OccPIR
C
1.10
BI
D20
UnOcc/Occ
SupFan AirFlo
AHU’3DigIns’SpFnDPS
SpFnDPS
C
1.11
BI
D20
NoFlo/Flow
ExtFan AirFlo
AHU’3DigIns’ExtFnDPS
ExtFnDPS
C
1.12
BI
D20
NoFlow/Flow
Extract Speed
AHU’6Outpts’4ExtFan
4ExtFan
C
4.1
AO
Y10S
%
0
100
Supply Speed
AHU’6Outpts’3SupFan
3SupFan
C
4.2
AO
Y10S
%
0
100
Heating Sig
AHU’6Outpts’7HtgSig
7HtgSig
C
4.3
AO
Y10S
%
0
100
Cooling SIg
AHU’6Outpts’91ClgSig
91ClgSig
C
4.1
AO
Y10S
%
0
100
Bypass Dmp
AHU’6Outpts’5DmpCnt
5DmpCnt
C
5.1
BO
Q250
Reclaim/Bypass
Fault Relay
AHU’6Outpts’92FltRly
92FltRly
C
5.2
BO
Q250
Off, On
Fan Enabled Rly
AHU’6Outpts’2FanEna
2FanEna
C
5.3
BO
Q250
Off, On
Chilled Dmd Relay
AHU’6Outpts’8ClgDmd
8ClgDmd
C
5.4
BO
Q250
No, Yes
Heat Dmd Relay
AHU’6Outpts’6HtgDmd
6HtgDmd
C
5.5
BO
Q250
No, Yes
IO Damper
AHU’6Outpts’11IODmp
11IODmp
C
5.6
BO
Q250
Close, Open
