Isolation - Before commencing work make sure
that the unitis electrically isolated from the mains supply.
Please note this product must be earthed.
10
Leaflet Number 611272 January 2012
Installation and Maintenance
MRXBOX90L Mechanical Ventilation with Heat Recovery
6.4 Mounting the pre-heater on
MRXBOX90L unit
• Switch off power supply of MRXBOX90L unit.
• The pre-heater unit has to be placed onto the ventilation
unit, on the duct 'from outside' (4). (see fig. 12).
• Connect the wires of the pre-heater unit according the
wiring diagram (below) to the required option print.
• Switch on the power supply from the MRXBOX90L unit
as well as the pre-heater unit.
I = To
dwelling
2 = To
outside
3 = From
dwelling
4 = From
outside
6.5 Wiring diagram for
pre-heater unit
E
X4
1
2
4
3
Mains in
Mains in
Figure 12. Typical installation for pre-heater
Figure 13.
A = Heating element (max. 1000W)
B = Safety switch for maximum temperature
with manual reset
C = Power connector 230V
D
= Cable, to be installed and connected
E = Option print (required for this option)
L = 230V LED, lights if safety switch
(temperature) is activated
C1 = Brown
C2 = Blue
C3 = Green/yellow
C4 = Black
The control signal for the pre-heater unit
has to be connected to connector X4 (230V)
of the MRXBOX90L option print.
Technical specifications
Power supply:
230V-50 HZ
Weight:
2.5kg
Duct diameter:
160mm
Protection class:
IP 20
Max. rated power:
1000W
Max. rated current: 4.5A
Settings for pre-heater unit
The MRXBOX90L unit needs to be programmed
to activate the pre-heater unit. This can be done
via the display. (parameter P11, pre-heater present).
To change this parameter, please check the installation
guide Large with option print.
