2
Leaflet Number 671281 March 2007
Installation and Maintenance
MVHR-LP Mechanical Ventilation with Heat Recovery
850
685
637
Bracket
fixing
VIEW FROM UNDERSIDE WITH COVER REMOVED
SIDE VIEW
MOUNTING BRACKET TOP VIEW
Mounting bracket
END VIEW
Single screw unit fixing
185
10
250
4 holes
7.5mm dia.
4 x spigot knockouts. 1 x 125mm dia. and 3 x 100mm dia.
for each supply and extract system
Cable entry 20mm
4 x end spigot
knockouts
100mm dia.
Mains
connection
box
125 dia. 100 dia.
extract extract
100 dia.
extract
100 dia.
extract
100 dia.
supply
100 dia.
supply
125 dia. 100 dia.
supply supply
125 dia.
Intake
125 dia.
discharge
2.0 Dimensions
Figure 5. Dimensions in mm.
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.
N
L
SL
Do not use
To OPUS-SPD
speed control
Internal
humidity adj.
To remote
fail indicator
ES-MEV-AVI
Calibration
Status
30
0
60
Run-on
(mins)
50
10
90
Max
Airflow
(l/s)
50
10
90
Min
Airflow
(l/s)
LVT NET TR
240V 1ph
supply
pre-wired
to terminal
box
Switch live
input
pre-wired
to terminal
box
(Terminal 1 for extract fan)
(Terminal 2 for supply fan)
3.0 Electrical Wiring
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).
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.
