Vent-Axia HR25 Solo User manual

© Copyright abc 2006 1
Models:-
HR25 Solo
HR25 Solo L
HR25 Solo H
HR25 Solo LH
Installation and User Instructions
GB
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PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS. PLEASE SAVE THESE INSTRUCTION
HR25 Solo
“Through the Wall” Heat Recovery Ventilators

© Copyright abc 2006 2
Contents
Section Page
1.0 Introduction 3
2.0 Site Requirements 4
3.0 Installation 5
4.0 Maintenance 11
5.0 Spares list 12

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Fig.1
1.0 Introduction
1.1 Description
1. The Vent-Axia HR25 Solo range of products are
“through the wall” heat recovery ventilators for use
in areas such as bathrooms and WCs.
2. The units are fitted with a 24V DC motor and
are supplied with a Switch Mode Power Supply
(S.M.P.S.). On normal setting the power
consumption is 2 Watts.
A 5m cable is provided for fixed wiring of the
unit to the S.M.P.S.
3. The twin impeller and heat exchanger
arrangement simultaneously supplies and
extracts air while transferring heat from the
stale exhaust airflow to the fresh intake airflow.
This provides up to 84% heat recovery from the
stale extracted air.
4. The range of products is as follows:-
HR25 Solo
The HR25 Solo is fitted with a pull cord switch
which provides a twin speed control function.
HR25 Solo H
The HR25 Solo H is fitted with an adjustable
humidity sensor which automatically switches
between low and high speeds depending on the
relative humidity in the room of installation.
HR25 Solo L & HR25 Solo LH
These are extended versions of the above
models. They are designed for installations
where the wall thickness is between 311mm
and 425mm.

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Fig.2
Fig.3
2.0 Site Requirements
2.1 Information
1. The unit is designed for installation in
external walls with a thickness of up to 310mm.
For wall thicknesses above 310mm, the ‘L’
version of the appropriate model must be used
(see page 12 ). The ‘L’ models are suitable for wall
thicknesses up to 425mm.
2. The unit must be sited and connected by a
suitably competent person and be in
accordance with current U.K. Building
Regulations and I.E.E. Wiring Regulations (BS
7671).
3. The unit must be installed in conjunction with
the separate power supply enclosure supplied,
which is intended for permanent connection to
the mains electrical supply. The unit and the
power supply enclosure are intended for fixed
wiring installation.
4. The power supply enclosure requires free air
circulation for effective operation It must not be
recessed into the mounting surface or covered
with any form of insulation, which might be used in
a ceiling or roof void.
5. Wiring to the unit in the U.K. must be via
the switched fused spur supplied as part of the
power supply enclosure.
6. The spur supplied is designed with a
minimum contact gap of 3mm in all poles.
7. Ensure that the mains electrical supply is
compatible with the rating label attached to the
product.
8. The unit must be sited such that the ambient
temperature will not exceed 40°C.
9. Screwdriver access must be provided to the
left of the power supply enclosure for the
removal of the cover screw (Fig. 2).
10. Do not site the appliance in the vicinity of
excessive levels of airborne oil or grease. or
directly over a cooker.
11. If the unit is installed in a room containing a
fuel burning appliance, the installer must ensure
that air replacement is adequate for both
appliances.
12. The unit must not be installed at a level
below 500mm from the floor.
13. The internal grille surround must be sited at
least 125mm away from the room ceiling (Fig. 3).
and 300mm away from any adjacent vertical
surface.
14. The external cowl of the unit must be sited
at least 500mm away from any flue of gas or
solid fuel appliances. This is to avoid back flow
of gases entering the room.
15. All safety regulations and requirements
must be strictly followed to prevent hazards to
life and property both during and after
installation and during subsequent maintenance
or servicing.
16. Ensure the mains electrical supply is
switched off before commencing installation or
maintenance.
2.0 Site Requirements
50mm minimum
50mm minimum
125mm minimum
300mm minimum 300mm minimum
Ceiling

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Fig.4
Fig.5
3.0 Installation
3.1 Initial Preparation
The unit is designed for installation in a 152mm
(6”) core drilled hole.
All installation can be undertaken from inside
the building except for fixing of the external
bezel if required.
1. After considering the site requirements (see
previous section), select a suitable position for
the unit and power supply enclosure (5m
maximum between unit and power supply).
2. Mark the position of the mounting hole.
3. Cut the mounting hole to a diameter of
152mm (6”) using a core drill. Ensure that there
is a slight fall on the hole, from inside to outside
(Fig. 4).
4. Remove the unit from the carton
5 Release cover using the two release clips
(Fig 5) Unplug the sensor cable from the PCB if
present
6 Using the mounting plate on the product.
Mark the position of the four mounting holes,
and then put product to one side. Drill and plug
the holes
7. Install the fixed cable runs using mini
trunking or via concealed installation. A
3-core red, white and black low voltage cable is
supplied for connections between the unit and
the power supply.
8. Ensure the cable to the unit extends
sufficiently from the mounting hole to enable
the required connections within the control
enclosure.
1o
Outside Inside

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Fig.6
Isolator unit section
Fig.7
3.0 Installation
3.2 Installing the Power Supply Unit
1. Remove the power supply unit assembly
from the carton.
2. Remove the power supply unit packaging.
3. Remove isolator and power supply covers
(Fig. 6).
4. The mains input to the power supply unit
must be routed via the rear or side of the
enclosure behind the switched connection unit.
NOTE: Mains wiring must be kept separate
from the S.M.P.S. side of the enclosure.
The mains connection is to the input side of the
isolator unit.
5. Remove one of the cable knockouts and
feed the 3-core cable through the power supply
enclosure (Fig. 7).
6. Mark the fixing hole positions then Drill and
plug the wall to secure the power supply
enclosure using the fixing screws provided.
7. Connect the 5m cable supplied to the red,
white and black low voltage supply via the
terminal block. Route it via one of the exit holes
(Fig. 7)
8. Ensure that the mains wires from the
S.M.P.S. run through the slot in the divider wall
(Fig. 6).
9. Fit the power supply cover using the small
self tapping screw through the side of the
power supply enclosure (Fig. 6).
10. Make the feed connections from the mains
supply to the rear of the isolator unit. Connect
live to L IN terminal, neutral to the N IN terminal
and earth to the brass earthing terminal.
11. Fit the isolator unit to the power supply
enclosure using the screws provided (Fig. 5).

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Motor wires
Wiring label
Low voltage
terminal block
Pull switch
Black motor lead
termination
Red motor lead
termination
Fig.10
Fig.11
Fig.12
3.0 Installation
3.0 Installation
3.3 Installing the HR25 Solo
1. Remove the bezel and fixing pack from
the carton.
2. 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. 10).
4. Secure the rubber seal to the unit using the
adhesive provided.
5. Locate the unit in the mounting hole, but do
not push it fully in.
6. Route the low voltage cable from the power
supply enclosure to the unit.
7. Pass the low voltage cable through the cable
entry grommet at the top of the unit
(Fig. 12).
8. Secure the unit to the wall using the four
fixing screws provided.
9. Strip the low voltage cable sheath back
40mm from the end and separate the three
individual wires stripped to 6mm.
10. Connect the wires to the terminal block.
Connect red to red, white to white and black to
black (Fig. 11 and 12).
11. Reassemble in reverse order
13. 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.
25mm
Outside wall
Rubber
seal
Release clips
Outer cover
Heat exchanger
External bezel
Cable entry

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Fig.13
Fig.14
Fig.15
3.0 Installation
3.4 Installing the HR25H Solo
1. Remove the bezel and fixing pack from
the carton.
2. 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. 13).
4. Secure the rubber seal to the unit using the
adhesive provided.
5. Locate the unit in the mounting hole, but do
not push it fully in.
6. Route the low voltage cable from the power
supply enclosure to the unit.
7. Pass the low voltage cable through the cable
entry grommet at the top of the unit (Fig. 15).
8. Secure the unit to the wall using the four
fixing screws provided.
9. Strip the low voltage cable sheath back
40mm from the end and separate the three
individual wires striped by 6mm.
10. Connect the wires to the terminal block.
Connect red to red, white to white and black to
black (Fig. 14).
11. The HR25H Solo unit is factory set to
switch between low and high speed.
Low / High speed (continuously running)
12. 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.
13. To adjust the humidity level, rotate switch
(A) as follows (Fig. 14) :-
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%).
14. Reassemble in reverse order ensuring the
humidity sensor cable is plugged into CON 4.
15. 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.
Release clips
Outer cover
Sensor
PCB
External bezel
Connection cable
Heat exchanger
25mm
Outside wall
Rubber
seal
Outer
cover Sensor Cable entry
grommet
BLK
WT
RED
BLK
RED
O/L
O/H
L/H
CON 4
O/L
O/H
L/H
SPEEDS
Position jumpers
for low/high speed setting
Switch (A)
Terminal Block

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Heat exchanger
Motor housing
Chassis
Inner tube
Outer tube
Rubber seal
Plastic ring
Motor wires
Wiring label
Low voltage
terminal block
Pull switch
Black motor lead
termination
Red motor lead
termination
Fig.21
Fig.22
Fig.23
Fig.24
3.0 Installation
3.6 Installing the HR25L Solo & LH
Solo
For wall thicknesses between
311mm & 425mm
1. Disconnect the red and black motor wires
(Fig. 21).
2. Carefully withdraw the heat exchanger from
the unit (Fig. 22).
3. Slide the inner tube out of the unit by
pushing the motor housing (Fig. 23).
4. Remove the plastic ring and rubber seal from
the outer tube (Fig. 24).

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Heat exchanger
Recess
Divider slot
Wiring tunnel
Fig.25
Fig.26
Fig.27
Fig.28
Fig.29
3.0 Installation
3.6 Installing the HR25L Solo & LH
Solo (cont)
5. Measure the wall thickness and add 25mm.
This is dimension “X” (Fig. 25.
6. Mark off dimension “X” on the outer tube,
measuring from the rear of the chassis. Cut off
the excess material (Fig. 26).
7. Remove any burrs from the tube.
8. Measure the waste from the outer tube and
cut the same amount off the base of the divider
board (Fig. 26).
9. Replace the rubber seal 50mm in from the
end of the tube and secure using the adhesive
provided.
10. Refit the plastic ring using the adhesive
provided.
11. Subtract 1.5mm from dimension “X”. This
will be dimension “Y”.
12. Mark off dimension “Y” from the motor
housing end of the inner tube, and scribe a line
around the inner tube. Peel the two motor wires
away from the wiring tunnel beyond the scribed
line to prevent damage. Carefully cut the
excess off the tube (Fig. 27).
13. Remove any burrs from the tube.
14. Reassemble the tubes in reverse order
ensuring that the two motor wires are located
back in the wiring tunnel, and that the tunnel is
aligned with the wiring slot in the chassis
(Fig. 28).
15. Replace the heat exchanger according to
the ‘Inside/Outside’ labels. The recess in the
heat exchanger outer must be aligned with the
wiring tunnel on the inner tube to ensure the
divider slot is vertical (Fig. 28 and 29).
16. Cut the two motor wires to size and
reconnect to their respective terminals (Refer to
the relevant unit instructions - see pages 7-8).
Continue installing the unit from paragraph 7
onwards in the relevant unit instructions - see
pages 7-8.
(X)
Waste
Outer tube
Chassis
Divider
board
Joint clip

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Filter
Outer cover
Filter
Release clips
Heat exchanger
Recess
Divider slot
Wiring tunnel
Fig.30
Fig.31
4.0 Maintenance
4.1 Cleaning the Unit (all models)
Apart from removing odours, providing fresh air
and recovering heat, this unit extracts airborne
impurities such as dust, dirt and grease. These
gradually build up and diminish the efficiency
and detract from the appearance of
the unit.
To maintain efficiency the unit should be
cleaned at least every six months, or more
regularly if a high level of contamination is
experienced.
1. Isolate the mains power supply.
2. Unclip the removable front cover from the
unit and remove the 2 filters. (Fig. 30).
3. Slide out the heat exchanger (Fig. 31).
4. Wash the outer cover, filters and heat
exchanger in warm water using a mild
detergent and dry thoroughly.
NOTE: Keep water away from all electrical
components and wiring within the unit.
If it is not possible to fully clean the filter, it must
be replaced (see short parts list on page 12 for
part number).
6. Reassemble in reverse order .
NOTE:
Follow the top‘Inside/Outside’instruction
labels on the heat exchanger and ensure
that the divider slot is vertical as shown
(Fig 31)
7. Switch the power supply on and check the
operation of the unit.

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5 6
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5ort Parts List
5.0 Spares list
5.1 Spares List
Key No. Description Part No.
1 Cover/Filter Assy 435739
2 Filter (pack of 2) 435740
3 Heat Exchanger 452914
4 Transformer power pack 372208
5 Rubber seal 371297
6. Pullcord/switch 435741
7. Humidity PCB 436391
8. Humidity sensor 435812
9 Motor assembly 436393

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434731B
0507
1.0 Introduction
VENT-AXIA SALES CENTRES
ENGLAND & WALES NATIONAL CALL CENTRE
Newton Road, Crawley
West Sussex
RH10 9JA
Telephone: [phone] REPUBLIC OF IRELAND
Fax: [phone] Vent-Axia Ventilation Ltd.
921 Western Road Industrial estate
Naas Road, Dublin 12.
Telephone: [phone]
` Fax: [phone]
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The Vent-Axia Guarantee
Applicable only to products installed and used in the United Kingdom. For details of the Guarantee outside of the United
Kingdom contact your local supplier.
Vent-Axia guarantees this product for two years from the date of purchase against faulty material or workmanship. In the
event of any part being found to be defective, the product will be repaired, or at the Company’s discretion the product will be
replaced without charge, provided that the product:
1). Has been installed and used in accordance with the instruction given with each unit.
2). The electricity supply complies with the rating label.
3). Has not been misused, neglected or damaged.
4). Has not been modified or repaired by any person not authorised to do so by Vent-Axia.
IF CLAIMING UNDER THE TERMS OF THE GUARANTEE
Please return the complete product, carriage paid to your original supplier by post or in person. Please ensure that it is
adequately packed and accompanied by a letter clearly marked ‘Guarantee Claim’ stating the nature of the fault and
providing proof of the date and source of purchase.
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