Isolation - Before commencing work make sure
that the unit, switched live and Nuaire control are
electrically isolated from the mains supply.
Please note this product must be earthed.
3
Leaflet Number 671390 July 2011
Installation and Maintenance
LPXBOXDC-2 Mechanical Ventilation with Heat Recovery
3.0 Electrical Wiring
N
L
2
1
L
N
E
230V - 50Hz
Factory fitted links
N
L
1
2
3A fuse
Isolator by others
N
L
2
1
L
N
E
230V - 50Hz
Remove factory fitted
link from 'L' to '1'
N
L
1
2
3A fuse
Isolator and switch by others
Boost switch
N
L
2
1
L
N
E
230V - 50Hz
Remove all factory fitted links
N
L
1
2
3A fuse
Isolator and switches by others
Boost switches
Boost
signal for
extract
fan
Boost
signal for
supply
fan
The supply and extract fan within the unit are pre-wired to
an external wiring box for ease of connection. (see figure 6a
to 6c). All field wiring must be routed through a suitable
local isolator.
Figure 6a. Basic wiring. Both supply and extract will run at
constant speed. The fan duty is controlled via the 'Boost' setting.
Figure 6b. Trickle and Boost operation. Both supply and extract
will run at trickle and boost speed together. Closing the boost
switch will cause both fan to run at boost setting.
Figure 6c. Wiring for independent boost. The supply and extract fan
will trickle and boost independently.
Figure 7. Circuit board wiring.
N
L
SL
Do not use
Internal
humidity adj.
To remote
fail indicator
Calibration
Status
30
0
60
Run-on
(mins)
10
90
Max
Airflow
(l/s)
10
90
Min
Airflow
(l/s)
LVT
NET
TR
240V 1ph
supply
pre-wired
to terminal
box
Switch live
input
pre-wired
to terminal
block
(Terminal 1 for extract fan)
(Terminal 2 for supply fan)
50
50
3.1 Additional Control Wiring Option
Other control wirings are available on each fan. Open the
cover of the unit to gain access to these connections on
each fan (see figure 7).
