Vent-Axia HR100R User guide

CE-1-11/00
HR100R
Mini Air Handling Unit -
For Ducted Ventilation With Heat Recovery
Installation and
Servicing Instructions
Please leave these instructions with the user

CE-1-11/00
2

CE-1-11/00
3
1.0Introduction 4
2.0Site Requirements 5
3.0Installation 6
4.0Electrical 10
5.0Commissioning 11
6.0Maintenance 12
7.0Optional Extras 13
8.0Notes 14
Section Page
Contents

1.0 Introduction
4
CE-1-11/00
1.1 Description
The Vent-Axia HR100R is a remote mounting unit to
provide balanced ventilation with up to 70%
heat recovery for applications where there is no
immediate access to an external wall. The
HR100R is ideal for installations involving internal
bathrooms and meets building regulation
requirements for this application.
A two speed motor provides for constant low
rate ventilation with a boost speed option. Fresh
pre-warmed air from outside is continually
provided to the room with simultaneous
extraction of stale air and smells. Heat is
transferred from outgoing air to the fresh air
supply with zero cross contamination,
maintaining internal temperatures and providing
a fresh environment.

2.1 Information
1. The unit must be sited and connected by a
suitably qualified person and be in accordance
with current U.K. Building Regulations and
I.E.E. Wiring Regulations (BS 7671).
2. The unit is intended for permanent
connection to the mains electrical supply.
3. The HR100R is intended for fixed wiring
installation.
4. Ensure that the mains electrical supply is
compatible with the product’s rating label.
5. The unit must be sited away from direct
sources of heat in excess of 40°C.
6. Do not site the ceiling diffusers in the vicinity
of excessive levels of airborne oil or grease.
7. If the ceiling diffusers are installed in a room
containing a fuel burning appliance, the installer
must ensure that air replacement is adequate
for both appliances.
8. The external grilles must be sited a minimum
of 500mm away from the flue of gas or open fire
appliances. This is to avoid back flow of gases
entering the room.
9. 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.
10. Ensure the mains electrical supply is
isolated before commencing installation, or
maintenance.
2.0 Site Requirements
5
CE-1-11/00

3.0 Installation
6
CE-1-11/00
3.1 Installing the Unit
1. Check that all components have been
delivered, as identified in the delivery note.
Notify the supplier of any errors or omissions
immediately.
2. Check the diagrammatic ducting layout
drawing to ensure that the proposed duct
routes, fan unit and air terminal locations can
be accommodated. If in doubt, refer to the
Technical Department.
3. The unit is designed to be mounted
horizontally. After noting the positions of the
electrical connector, duct spigots and drainage
connection for the unit, choose a suitable
installation site for the unit. The most desirable
location for the unit is normally within the roof
space.
4. Never locate the unit above a sleeping area.
The most suitable position is normally above
the landing or bathroom. The selected site must
allow adequate space around the unit for the
removal of the access panel and heat
exchanger for maintenance and servicing
puposes.
5. When installing the unit, a suitable platform
must be made. This should be built from
chipboard or blockboard (19mm preferred). This
board should be raised enough to facilitate the
mounting of the unit above joist level.
6. The unit must be positioned so that the
condensate outlet can be trapped and the
condensate conveyed properly with a
continuous gradient to discharge through the
gable or to the eaves gutter in the selected
location.
7. Connect the drainage system as appropriate
using PVC pipework, joined using PVC cement
to ensure of watertight joints.
N.B. The trap should be charged/filled before
operating the system, and should be checked
especially in summer. Also note that a blocked
condensate outlet pipe due to insufficient pipe
gradient will quickly lead to water damage.
8. A shell bit is recommended for drilling holes
in the ceiling to accomodate the housings for
supply and extract air terminals (SV100 and
EV100). Make sure that you are not drilling into
structural members, water or gas pipes or
electrical cables and that there is room behind
the plaster board for duct access and securing
ring. Ceiling terminals should preferably be
fitted equidistant from adjacent walls bearing in
mind that coving may already be fitted or may
be fitted at a later date.
E100R Unit
Joist Condensate Trap (50mm Min)
Mounting
Platform

3.0 Installation
7
CE-1-11/00
3.1 Installing the Unit
9. Place the terminal housing in the hole in the
ceiling and secure to the back ring with the four
screws provided.
10. For two storey new build properties it is
recommended that the ground floor terminal
housings are secured in position in advance of
the plasterboard panels being fixed, by
obtaining a sheet of plasterboard of the type
and thickness to be used. Cut a square of the
sheet to just span two joists in the corner where
the terminal is to be fitted. Remember that the
edge of the sheet on the inner joist should only
rest on half of the joist thickness. This allows a
fixing surface for the next sheet of plasterboard
to be secured to when it is fitted. Tack up the
plasterboard in position on the ceiling and
connect up and seal the duct and fittings.
11. For two storey existing properties it is
necessary to lift the floor coverings at first floor
level above the terminal positions to gain
access to the terminal housings to secure and
seal the duct and fittings.
12. Fix in position all vertical supply and extract
air ducting being conveyed between ground
floor ceiling level and the loft space.
13. The external grilles for intake and exhaust
air should be positioned so that the exhaust air
is not drawn in again.
14. If the grilles are fitted in the same gable at
the same height, a minimum of 1m between
grilles is recommended.
15. If the grilles are positioned above one
another the distance apart should be at least
1m with the exhaust grille at the top.
16. Roof ventilators placed on the same roof
surface should be positioned at the same
distances as the grilles.
17. Always ensure that all exhaust grilles/roof
ventilators are placed higher than the top edge
of the highest window and at a distance of at
least 1m from the nearest window.
Terminal Housing
Plaster Board
Securing Ring / Back Plate
(for fire valves)
Securing Screw
Terminal

3.0 Installation
8
CE-1-11/00
3.1 Installing the Unit
18. External grilles placed in the soffit should
be positioned at the same distances as
indicated for gables.
19. The Quicktube Rigid UPVC duct system
permits fast, easy assembly whilst ensuring
pressure-proof system sealing.
20. The ducts are delivered in lengths of 3m
and are easily shortened as required with a
duct saw or a similar fine toothed saw. We
recommend that you file the edges of the ducts
after shortening.
21. Assemble the duct and fittings, following as
closely as possible the diagrammatic ducting
layout. Ensure that the duct is raised above
joist level to allow for thermal insulation of the
ducting.
22. Each straight length of duct is assembled
using a flexible connector (QTC) to join the two
ends, whilst 90°and 45°diversions and
branches are accomplished with flexible fittings
(QTB90, QTB45 and QTET). The duct is a push
fit into the socket of the connector and fittings.
23. Once assembled the joints are secured with
duct tape (DT30) to provide an airtight seal.
Ensure that the tape is secured over the
complete joint area to provide an airtight seal.
24. If the loft space is unheated the unit and
ducting will require to be thermally insulated to
preclude condensation occuring and to
minimise heat loss. This requirement must be
observed in the planning and routing of the
duct system.
25. The insulation recommended is Alreflex 1L1
which comprises 3mm thick polyethylene
bubble sheet laminated on the external surface
with aluminium foil protected by a thin
polythene film. The product is CFC and HFC
free and has a surface spread of flame of Class
1 tested to BS476 Part 7/971. It should,
however, be protected from open flames or
sparks and stored apart from highly flammable
materials.

3.0 Installation
9
CE-1-11/00
3.1 Installing the Unit
26. The material provides resistance to heat
loss from the distribution ducting and a highly
effective vapour barrier when all joints are
sealed with metallised tape. It is light but robust,
not easily damaged in storage or during
construction and is rot proof, water and vapour
resistent, durable and can be expected to
remain an effective insulant for the normal life
span of a building.
27. The insulation is supplied in 1.5m long
preformed sections for application to the ducting
at the time of installation. All joints should be
secured using the metalised tape (DTA30)
provided to ensure that a continuous vapour
seal is maintained.
28. The use of flexible ducting should be limited
to an absolute minimum. If used it should be
fully stretched in order to minimse pressure
loss.
29. Offer the unit on to the mounting surface,
ensuring that it is not susceptible to movement
under operation. Use directional airflow
indicators on the top of the unit to ensure the
correct connection to external and internal
vents.
30. Mate up the ducting as appropriate,
ensuring that the airflow is in line with the
directional indicators.
31. Determine the most appropriate siting
position for the appropriate control. Normally,
this would either be a manual control switch
(NBSW), pull-cord switch (PCSW) humidity
switch (HS6) or speed control switch
(VCON100).
32. Determine the appropriate wiring
connections as outlined within section 4, and
wire in accordance with current IEE Wiring
Regulations, ensuring that the mains feed is
isolated before making any connections.

CE-1-11/00
4.0 Electrical
10
4.1 Electrical Connections
230V 50Hz 12W (normal) 31W (boost)
NOTE: Wiring must be via a 3A fused
switched spur with a 3mm contact separation
in each pole. The wiring should be suitably
(BASEC or HAR) approved cable of
appropriate current carrying capacity.
HR100R Terminals 3 amp fused supply
L
L
NNeutral
Live
Black
Brown
Blue
Green/Yellow Earth
1
2
HR100R Terminals 3 amp fused supply
L
L
NNeutral
Live
Black
Brown
Blue
Green/Yellow Earth
1
2
HR100R Terminals
3 amp fused supply
L
L
N
Neutral
Live
Black
Brown
Blue
Green/Yellow
Earth
1
2
L
N
HR100R Terminals
3 amp fused supply
L
L
NNeutral
Live
Earth
1
2
HR100R Terminals
3 amp fused supply
L
L
NNeutral
Live
Black
Brown
Blue
Green/Yellow Earth
1
2
1
0
2
Continuous Normal Speed
Continuous Boost Speed
VCON100: Manual Normal to Boost Speed
Switching and ON/OFF Control
NBSW and PCSW: Manual Normal to Boost
Speed Control
HS6: Automatic Normal to Boost Speed Control
1
0
2
L
SL
N
TIM2 Terminals
Neutral
Link Light fitting if
appropriate
Switched live
Mains via switched
fused spur
Live
Earth
HR100R
Terminals
L
L
N
HR100R
Terminals
3 amp fused
supply
Neutral
Live
Switched Live
Light
Earth
L
L
N
1
2
For units switching to boost on operation of a light switch, an
in-line timer (order code TIM2) should be wired into the circuit
as shown below.
Automatic Control
The HR100R unit operates on continuous trickle ventilation.
Operation of switch turns unit to boost ventilation. When switch
is turned off units continue to operate on boost for a preset
period - adjustable 2-30 minutes.
The HR100R MUST NOT be wired in conjunction with a light
switch, units will fail.

5.0 Commissioning
11
CE-1-11/00
5.1 Commissioning the System
Before starting to commission the system check
the following:
a) All ducting is in place and secured.
b) The wiring is secure and correctly connected.
c) The trap is in position, charged and will
enable efficient removal of condensate.
d) The unit is mounted appropriately in a
position not susceptible to movement or
damage.
The scope of the commissioning procedure
comprises:
1. Balancing the two airflows to achieve
maximum heat exchanger efficiency.
2. Adjusting the two airflows to obtain the overall
airflow rates and the individual terminal air flow
rates as specified on the air change schedule.
3. An airflow meter must be used to set the
correct airflows.
NOTE: The supply air terminal device is
directional and incorporates a deflector plate.
Ensure that the deflector plate is correctly
positioned so that the active part of the
terminal device is discharging to the room.
4. Set the control switch (NBSW or PCSW) to
normal speed or set the humidistat (HS6) at
maximum and check that air is flowing in the
correct direction at each terminal point.
5. Standard ceiling terminals type EV100 and
SV100 are adjusted by turning the central screw
and are locked in the “set”position by the
locknut.

6.0 Maintenance
12
CE-1-11/00
6.1 Cleaning the Unit
In addition to removing odours, providing fresh
air and recovering heat, this unit extracts
airborne impurities such as dust, dirt and
grease. These gradually build up and detract
from the efficiency and appearance of the unit.
To ensure optimum performance, the unit
should be cleaned every three to six months or
at periods determined by the level of
contamination experienced, and according to
the following procedure.
1. Isolate the mains power supply.
2. Remove the four securing screws from either
end of the cover.
3. Remove the cover.
4. Remove the heat exchanger from the unit.
5. Wash the heat exchanger in warm water
using a mild detergent and dry thoroughly.
Keep water away from all electrical components
and wiring within the unit.
If the filter cannot be cleaned, replacement is
recommended.
6. Reassemble in reverse order. The heat
exchanger should be repositioned with the ‘To p ’
label facing the front and pointing upwards.
Heat Exchanger
Securing
Screws
Securing Screws
Cover

7.0 Optional Extras
13
CE-1-11/00
7.1 Ancillary Equipment
Internal Supply Valve
Ref: SV100
Adjustable supply valve with 80mm long,
100mm diameter spigot connection. Valve
design ensures horizontal discharge of air for
optimum diffusion. Moulded in white plastic, the
EV100 valve is suitable for both ceiling and wall
mounting and is 150mm diameter overall.
Filter
Ref: F100
Coarse in-line filter complete with reticulated
foam element. Compatible with 100mm
diameter ducting.
External Push-Fit Wall Vent
Ref: WC1
400mm long brown plastic duct and external
grille with vaned rubber seal for push fit
installation in external walls. Fits into pre-drilled
hole of 115mm diameter.
External Dual Wall Vent
Ref: WC2
Combined supply and extract terminal with grey
plastic external cowl, with 100mm diameter
ducting. This vent is ideal for exposed
installations.
External Louvre Wall Box
Ref: WL100
Anodized aluminium external weather louvre
with metal wall box 130 x 130mm and 174 x
174mm grille. 100mm diameter spigot
connection.
Ventilating Roof Tiles
Ref: VT100
Moulded ventilation terminal tiles, available in a
range of sizes, profiles and colours. 100mm
diameter spigot connection.
In-Line Heater
Ref: ILH100
Compatible with 100mm ducting, the ILH100
provides a boost heat facility when required.
Flexible Ducting
Ref: AFD100
Aluminium ducting in 10m lengths.
Ref: ACD100
Acoustically insulated ducting in 6m lengths.
Ref: IFD100
Thermally insulated ducting in 6m lengths.
Ref: PFD100
PVC ducting in 6m lengths.
Quicktube 100mm rigid plastic ducting can also
be used in conjunction with the HR100R unit. For
details please see data sheet.
Speed Control Switch
Ref: VCON100
White plastic single gang switch for ON/OFF
control and NORMAL/BOOST speed control of
HR100R unit.
Speed Control Switch
Ref: NBSW
White plastic single gang switch for
NORMAL/BOOST speed control of HR100R unit.
A metal black box for flushing mounting
(Ref: MBB) and plastic back box for surface
mounting (Ref: PBB) are available for use with
the above controllers.
Pullcord Control Switch
Ref: PCSW
2 way ceiling mounted switch for
NORMAL/BOOST speed control of HR100R unit.
A second PCSW can also be used for ON/OFF
control.
Humidity Sensor
Ref: HS6
Electronic humidity sensor with changeover
relay output and adjustable switching point from
60% to 100% RH. In built temperature
compensation (night time setback).
Contamination protection sensor.
Timer
Ref: TIM2
Remote mounting timer box to provide ON/OFF
control or switching between the 2 speeds on
operation of switched live. Over-run period
adjustable 2-30 minutes.
Internal Extract/Supply Grille
Ref: ESG100
White plastic louvre grille designed to fit in the
wall or ceiling and serves both extract and
supply functions. 100mm diameter spigot
connection.
Internal Extract Valve
Ref: EV100
Adjustable extract valve with 80mm long,
100mm diameter spigot connection. Moulded in
white plastic, the EV100 valve is suitable for
both ceiling and wall mounting and is 150mm
diameter overall.

8.0 Notes
14
CE-1-11/00

CE-1-11/00
15

CE-1-11/00
Vent-Axia Ltd
Fleming Way
Crawley
West sussex
RH10 9YX
www.vent-axia.com
Comp No 370666 - Iss C- 0310