2
14. 02. 14. Leaflet Number 671438
Installation and Maintenance
MRXBOX95-LOFT Mechanical Ventilation with Heat Recovery
2.1 Condensate Drain installation
1.
Remove top cover and remove heat exchanger.
The condensate outlet can then be seen at the base of
the unit. Using a 90 Deg bend and suitable length of
¾” / 21.5mm diameter overflow pipe (not supplied) take
the condensate to the outside of the unit (can be taken
to either side of the unit as required).
Suitable adhesive should be used for all connections.
2. The drain should run through a secondary trap before
being discharged into the waste water system.
3. If using a U-trap please ensure the U-trap has been filled to
a suitable level of water to avoid any air locks.
4. If the condensation pipe is fitted in an unheated space the
pipe should be in insulated to prevent freezing.
Nuaire recommend MVHR-DRAIN be used as the primary
condensate take-off. (see figures 2c and 3a).
Fixing MVHR-DRAIN
Offer up the MVHR-DRAIN inlet to the threaded tail of the
appliance waste outlet or MVHR-DRAIN knuckle or running
adaptor, and tighten the threaded cap sufficiently hand-tight to
provide a water-tight seal (check that the cap screws on square
and does not ‘cross-thread’). When the screwed cap is tight, the
MVHR-DRAIN
body is secure.
1.
Cut the pipe to length, allowing for the full compression
socket depth (using an appropriate pipe cutter, such as a
Hepworth rachet pipe cutter).
2. Remove any ‘swarf’ from the end of the plastic pipe.
Ream the copper pipe end to remove any ‘burr’, and file if
necessary to remove any external sharp edges. Mark the
socket depth on the pipe, and check that the pipe section to
be jointed is free of any surface damage which may affect
the joint seal.
3. Unscrew the cap from the MVHR-DRAIN outlet, and slide the
cap and rubber seal onto the pipe.
4. Insert the pipe end fully into the socket.
5. Slide the rubber seal and screwed cap up against the face of
the socket, and tighten the cap sufficiently hand-tight (check
that the cap is square to the body and does not ‘cross-
thread’). Hand tight should be adequate to form a proper seal.
Figure 3b. Plan view of unit showing drip tray and condensate
drain position.
Figure 2c. Mounting MRXBOX95-LOFT onto roof joists using the ‘L’ shaped fixing
brackets and AV mounts with four suitable screws on the short side of the unit.
Unit shown with MVHR-DRAIN condensate drain, running to SVP.
Installation cont.
Figure 2d. Unit viewed from the front
mounted at a slight angle.
Figure 3c. Condensate pipe connection to unit and a typical example
of a “U” trap drainpipe.
21.5mm dia. condensate pipe.
5
o
Drop
Side view of unit
Front view
21.5mm dia. condensate drain
21.5mm dia. condensate drain
alternative position
Drain Tray
Two fixing brackets
should be attached
on the non-control
end of the unit via
the two lower hole
positions.
(see figure 2b).
Two fixing brackets
should be attached
on the control end of
the unit via the two
upper hole positions.
(see figure 2b).
Condensate drain,
insulated drain pipe with
10
0
fall running to SVP.
(Part no. MVHR-DRAIN).
Figure 3a. MVHR-DRAIN correct installation.
RIGHT
WRONG
Flow
Side elevation
When installed horizontally the ribs must be at the bottom to
ensure correct operation.
