Vent-Axia HR25H Installation And Wiring Instructions page 8

Filter
Removable Grille
Sensor
Grille Surround
Securing Screws
1 2 3
SPEEDS
SPEEDS
Switch (A)
Sensor
Control Cover
8
Control Cover
Divider Board
Outside
Wall
Jumpers
Fig. 23
Terminal Block
BLK
WT
RED
BLK
RED
External Bezel
Fig. 20
Fig. 21
25mm
Rubber
Seal
Fig. 22
Divider Slot
Cable Entry
Grommet
Fig. 24
3.0 Installation
Installing the HR25H
3.4
1. Remove the unit, bezel and fixing pack from
the carton.
2. Unclip the removable grille from the unit and
remove filter (Fig. 20).
3. Loosen the two securing screws and remove
the grille surround (Fig. 21).
4. Remove the divider board (Fig. 21).
5. Measure the total wall thickness.
The outer of the two rubber seals is adjustable
and should be set in a position that is 25mm in
from the outer face of the external wall (Fig. 22).
6. Secure the rubber seal to the unit using the
adhesive provided.
7. Locate the unit in the mounting hole, but do
not push it fully in.
8. Route the low voltage cable from the power
supply enclosure to the unit.
9. Pass the low voltage cable through the cable
entry grommet at the top of the unit
(Fig. 24).
10. Secure the unit to the wall using the four
fixing screws provided.
11. Carefully remove the control cover by
undoing the two retaining screws. Take care not
to dislodge the sensor or strain the wires
(Fig. 24).
12. Strip the low voltage cable sheath back
40mm from the end and separate the three
individual wires.
13. Connect the wires to the terminal block.
Connect red to red, white to white and black to
black (Fig. 23).
14. Ensure that the low voltage cable is routed
through the divider slot (Fig. 24).
15. The HR25H unit is factory set to switch
between high or low speed. Two alternative
settings can also be achieved by changing the
position of the 'jumpers' on the control board
(Fig. 23).
1 Off / Low speed
2 Off / High speed
3 Low / High speed (continuously running)
16. The switching point of the unit can be
adjusted between 60% - 90% humidity. It is
factory set to operate at 70% humidity at 25°C.
17. To adjust the humidity level, rotate switch (A)
as follows (Fig. 23):
a) For the unit to operate at a lower humidity
level, turn switch (A) anti-clockwise (Min. 60%).
b) For the unit to operate at a higher humidity
level, turn switch (A) clockwise (Max. 90%).
18. Reassemble in reverse order ensuring the
divider board seals against the heat exchanger.
19. A bezel is provided to neaten the appearance
of the outside wall around the unit. If required this
should be fixed in place using a suitable
silicone/mastic sealant.