4
Leaflet Number 671453 January 2011
Installation and Maintenance
MRXBOX95B-LOFT Mechanical Ventilation with Heat Recovery & Summer Bypass
Fuse 2A
MAINS
230V
50Hz
Room
light
Light
switch
(Double
Pole)
N
L
3 Pole
isolator
Kitchen switch
Green/yellow
Blue
Brown
Black
Summer
bypass
switch
Grey (only used
on bypass unit)
Supply cord
from unit
Unit serving kitchen and bathroom
Unit serving kitchen and two bathrooms
Fuse 2A
MAINS
230V
50Hz
Room
lights
Light
switches
(Double
Pole)
N
L
3 Pole
isolator
Kitchen switch
Green/yellow
Blue
Brown
Black
Summer
bypass
switch
Grey (only used
on bypass unit)
Supply cord
from unit
Figure 6.
Figure 7.
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.
4.0 Electrical Connection
Please note: the electrical connection of the unit must be be carried
out by a qualified electrician.
The unit is supplied with a flexible cord for connection to the mains
supply.
Electrical details:-
Voltage:
240V 1ph 50Hz
Consumption:
75W (max) 0.6 amps
Fuse rating:
3 Amp
NOTE This unit must be earthed
The three core cable from the mains power supply should be
connected to a fixed wiring installation, via a fused isolator, in
accordance with current IEE wiring regulations.
SWL N L
Connections for
optional controls
Volt free relay
contacts.
Run
Switch to deactivate
continuous trickle
Fan connections
230V IN
50Hz
Mains
Fault
Internal wiring
Connection to supply cord
Earth point
Bypass
SWL
(Grey)
Internal
wiring to
Bypass
Damper
2 Way
Terminal
Block
Figure 5a. Power supply PCB.
230V in, 24V dc out.
Figure 5b.
Control PCB.
24V
Note: Wiring is for reference purposes only as the
connections above are factory fitted.
The unit is pre-wired with a 2 metre fly lead.
