Vent-Axia HR25H Installation And Wiring Instructions page 9

Filter
Removable Grille
Control Cover
Sensor
Grille Surround
Divider Board
Securing Screws
1 2 3
SPEEDS
BLK
CON 7
SPEEDS
RED
Switch (A)
CON 5
PIR Sensor
WT
Control Cover
25mm
Outside
Wall
Jumpers
Fig. 28
Terminal Block
Divider Slot
BLK
WT
RED
BLK
RED
3.0 Installation
3.5
1. Remove the unit, bezel and fixing pack from
the carton.
2. Unclip the removable grille from the unit and
remove filter (Fig. 25).
External Bezel
3. Loosen the two securing screws and remove
the grille surround (Fig. 26).
4. Remove the divider board (Fig. 26).
Fig. 25
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. 27).
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.
Fig. 26
9. Pass the low voltage cable through the cable
entry grommet at the top of the unit
(Fig. 29).
10. Secure the unit to the wall using the four
fixing screws provided.
11. Carefully loosen the control cover by undoing
the two retaining screws. Slowly pull the cover
forwards. There are two sets of wires leading
Rubber
from the PIR sensor in the control cover to the
Seal
control board. Note the position of these wires
and unplug them at the control board. Place the
control cover to one side (Fig. 29).
12. Strip the low voltage cable sheath back
40mm from the end and separate the three
individual wires.
Fig. 27
13. Connect the wires to the terminal block.
Connect red to red, white to white and black to
black (Fig. 28).
14. Ensure that the low voltage cable is routed
through the divider slot (Fig. 29).
15. The HR25P 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. 28).
1 Off / Low speed
2 Off / High speed
Cable Entry 3 Low / High speed (continuously running)
Grommet
16. The unit is designed to operate under two
different conditions, these are as follows:
a) DIRECT ACTION:
This mode effectively means that the PIR sensor
will detect movement within the room and either
switch the unit on, or from the low to high speed
depending upon how it has been set (paragraph
15 above).
b) DELAYED ACTION:
This mode means that the PIR sensor will ignore
movement in the room for the first 2 minutes. This
mode has been designed for night time use of
toilets and bathrooms where brief visits will not
Fig. 29
activate the unit.
Installing the HR25P
9