N
L
1
2
1
2
3
4
5
6
7
8
Normal
Boost
1
2
3
4
5
4
5
6
ON
FRONT
UP
14
7.0 Installation
7.5
Making the duct connections
1. The unit has four duct connections suitable for
100mm round ducting.
1. Exhaust outlet to outside
2. Air inlet from outside
3. Stale air inlet from dwelling
4. Fresh air outlet to dwelling
Notes: It is essential that the duct system
is connected as indicated.
It is important that the duct system does
not interfere with the correct fitting of the
front cover and does not prevent the
correct operation of the unit.
7.6
Controls
1. The LoWatt HR204 requires external controls
to enable normal/boost switching. Otherwise it
will only run at its normal speed.
7.7
Making the electrical connection
Warning: This appliance must be earthed
Refit electrical cover plate.
Front cover
Fig. 12
1
2
3
4
5
6
7
8
N
L
1
2
Normal
Boost
1
2
3
4
5
4
5
6
ON
1. The unit must be set to the appropriate speed
as determined by air flow required and duct
system pressure (see page 7).
2. To change the speed settings of the fans,
change the position of the dip switches on the
PCB. The 5 switches on the left let you select
the normal speed from speeds 1 to 5. The
remaining 3 switches let you select the boost
speed from speeds 4 to 6.
3. Refit the electrical cover plate and its earth
lead.
4. Connect the flying lead to the mains supply -
see section 6.5.
5. Check the electrical installation for earth
continuity, short circuits, resistance to earth and
correct polarity.
Example shown
Normal speed = speed 2
Boost speed = speed 5
2. Drill a hole in the top grommet, (do not
slice), equal to half the diameter of the two
core cable to go through it.
3. Feed the lead into the unit through the top
grommet, down the side, through the lower
grommet and into the PCB area. Secure the
lead with the cable clips and clamps.
5. Wire to terminals 1 and 2. See wiring
diagrams in section 8.0.
Mains
lead
Optional
controls cable
Cable clips
on inside
1
2
3
4
Upper grommet
Lower grommet