11.0 MEV-SVS units
Nuaire's MEV-SVS units are designed to provide
continuous mechanical supply/extract ventilation to
homes enabling each room to be individually ventilated.
Coding:
MEV - SVS
Comprising a supply fan unit, an extract fan unit and a
unique multi-spigoted distribution box.
Attenuators to be specified and supplied seperately.
MEV-SVS control wiring using remote speed
control (Opus-SPD)
The extract fan operates continuously in trickle mode.
The supply fan will operate in trickle mode when
activated by the supply fan switch.
The remote boost switch will set both extract and
supply fans to boost if they are operating in trickle
mode. If the supply fan is switched off, only the
extract fan will operate.
Supply fan boost airflow should be set to fully
clockwise.
The supply fan will only operate on boost speed from
the boost switch if the speed control is set to off.
Extract fan airflows should be set to meet Part F
requirements.
Installation and Maintenance
MEV-SVS
Continuous Mechanical Ventilation Supply/Extract Units
6
Leaflet Number 671266 July 2007
Figure 9. Typical installation.
Fresh filtered air
into habitable rooms
1
2
3
4
1
2
3
4
4
4
12.0 Electrical Wiring (MEV-SVS)
Figure 10.
Supply
230V
50Hz
1 Ph
N
L
SL
N
L
Extract
Fan
3 Pole
isolator
Boost switch
N
L
SL
Supply
Fan
3 Pole
isolator
T
V
L
To remote
speed
control
M
3A
Supply fan
switch
S
Supply Unit
Extract Unit
Supply Air Distribution Box
Extract Points “Wet Rooms”
Figure 11.
MEV-SVS wiring using light/remote switches
The extract fan operates continuously in trickle mode.
The supply fan will operate in trickle mode when
activated by the supply fan switch.
The remote boost switch will set both extract and
supply fans to boost if they are operating in trickle
mode. If the supply fan is switched off, only the
extract fan will operate.
Supply fan boost airflow should be set to fully
clockwise.
Extract fan airflows should be set to meet Part F
requirements.
3A
Room
light
N
L
SL
N
L
3 Pole
isolator
Extract fan
boost switch
M
N
L
SL
Supply
Fan
3 Pole
isolator
Extract
Fan
Supply
230V
50Hz
1 Ph
Light
switch
All switches by others
3
Supply fan
switch
For good EMC engineering practice, any sensor cables
or switched live cables should not be
placed within 50mm of other cables or on the same
metal cable tray as other cables.
