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Installation and Maintenance
Installation cont.
Figure 2b. Mounting MRXBOX95B-LH1/LH2 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.
Two fixing brackets
should be attached
on the control end of
the unit via the two
upper hole positions.
(see figure 2c).
Figure 2d. Unit viewed from the front mounted at a slight angle.
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).
Figure 3a. MVHR-DRAIN correct installation.
RIGHT
Flow
When installed horizontally the ribs must be at the bottom to
ensure correct operation.
Fixing MVHR-DRAIN
Offer up the
inlet to the threaded tail of the
MVHR-DRAIN
appliance waste outlet or
MVHR-DRAIN
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.
MRXBOX95B-LH1/LH2 Mechanical Ventilation with Heat Recovery & Summer Bypass
Condensate drain,
insulated drain pipe with
0
10
fall running to SVP.
(Part no. MVHR-DRAIN).
WRONG
Side elevation
knuckle or running
2
Figure 2c. Side and front view example of
an 'L' shaped fixing bracket and AV mount
attached to ceiling joist.
mounting hole positions
Two fixing brackets
should be attached
Metal bracket
on the non-control
attached to unit
end of the unit via
Washer Woodscrew
the two lower hole
positions.
(see figure 2c).
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
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. (Right)
Plan view of unit showing
drip tray and condensate
drain.
Figure 3c. (Below)
Condensate pipe connection
to unit and a typical example
of a "U" trap drainpipe.
Side view of unit
21.5mm dia. condensate pipe.
Higher and lower
A. V. mount
Ceiling joist
outlet, and slide the
MVHR-DRAIN
21.5mm dia. condensate drain
alternative position
Drain Tray
21.5mm dia. condensate drain
Front view
24. 01. 17. Leaflet Number 671500
o
5
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