5
Leaflet Number 671366 July 2007
Installation and Maintenance
mrXbox90S Mechanical Ventilation with Heat Recovery
5.2 Connecting the ducts cont.
Arrange the exterior air supply from the shadowed (North) side of the
dwelling, for instance from the wall or overhang.
• install the discharge duct between the mrXbox90S and the
roof sleeve in such a manner that surface condensation is
prevented
• always use an insulated ventilation roof sleeve
• the maximum permissible resistance in the duct system is
150 pa at the maximum ventilation capacity. if the resistance of
the duct system is higher, the maximum ventilation capacity will
be lower
• the location of the mechanical ventilation outlet and the sewer
stack vent relative to the inlet must be chosen to prevent
nuisance
• choose the location of the inlet valves to prevent fouling and
draught
Ducting references:
1
= to dwelling. Supply (warmed fresh air)
2 = to outside. Exhaust (cool stale air)
3 = from dwelling. Extract (warm stale air)
4 = from outside. Intake (cool fresh air)
5.3 Connecting the condensate discharge
The condensate discharge line for the mrXbox90S is fed through the
lower panel. the condensate must be discharged through a
drainpipe. The drain must discharge under the water level in the
U-trap. The condensate discharge comes separately with the unit
and the installer must screw it into the underside of the unit.
This condensate discharge connection has an external connecting
diameter of 20mm. The condensate discharge line can be glued to
it, if necessary using a square bend. The installer can glue the
condensate discharge in the desired position in the lower part of the
unit.
See Figure 8 below for an example of a connection to a drainpipe.
Pour water into the drip tray to create an air trap.
4
2
1
1
3
3
1
Figure 7. Typical installation with unit mounted on wall
Figure 8.
