Vent-Axia HR400 User guide

HR320 & HR400
Whole House Ventilation System
With Heat Recovery
Installation and
Servicing Instructions
Please leave these instructions with the user
HR400
HR320

2

3
1.0Introduction 4
2.0Site Requirements 5
3.0Installation 7
4.0Electrical 17
5.0Commissioning 18
6.0Servicing 20
7.0Fault Finding 21
8.0Guarantee 22
Section Page
Contents

1.0 Introduction
4
1.1 Description
1. The HR320 and HR400 are a
range of whole house ventilation units
(Figs. 1 & 2).
The ventilation unit works in conjunction with a
duct system enabling air to be transferred
throughout the house.
The whole house system works by replacing
the warm stale moist air from the house, with
fresh air from outside. The fresh air passes
through a highly efficient heat exchanger and is
prewarmed by the heat which is recovered from
the extracted air. The heat exchanger recovers
up to 70% heat from the outgoing stale air.
1.2 Operation
1. The unit is designed to switch between trickle
and boost settings to give optimum
performance. This can be achieved manually
through a switch or pull cord, or automatically
using a remote humidity sensor.
Trickle is continuous low speed at which the air
in the property is changed approximately once
every two hours.
Boost increases the ventilation rate throughout
the property for manual control. Under
automatic control the unit changes to boost on
increase in relative humidity above a set point.
It reverts to trickle when the relative humidity
drops below the set point.
NOTE: The system is audible when
operating at boost speed.
2. Speed control of the unit is via a separate
transformer (VCON77) which is capable of
giving a range of six speeds (Fig. 3). Any two
speeds can be selected on installation to give
trickle and boost settings most appropriate to
the system.
With the units operating on boost setting the
electrical power consumption is;
HR320 - 200W
HR400 - 305W
NOTE: Refer to the VCON77 instructions for
information on installation and speed
selection.
Fig. 1
Fig. 2
Fig. 3
HR400
HR320
VCON77

2.1 Information
1. The fan unit is to be permanently connected
to the mains electrical supply and must be
installed by a suitably qualified person.
2. The fan unit must be sited and connected in
accordance with UK Building and IEE Wiring
Regulations (BS 7671) or regulations and /or
standards appropriate to the country of use.
3. Wiring to the fan unit in the UK must be via
a 3 Amp fused and switched connection unit
incorporating a double pole switch having a
contact separation not less than 3mm and
conforming to BS 5733 or BS 1363 Part 4. The
connection must be located outside of a fixed
bath, shower or wash hand basin. The wiring
should be suitably (BASEC or HAR) approved
cable of appropriate current carrying capacity.
4. The fan unit is Class 1 and must therefore be
earthed.
5. The fan unit must be connected to a trapped
drainage system to allow condensate to be
freely drained from the unit to the chosen
discharge point.
6. If the fan is installed in an unheated roof
void, or similar location, it should be insulated
together with any associated ducting within this
space.
7. The fan unit must be sited away from direct
sources of heat in excess of 40°C.
8. Do not position an internal extract valve/grille
in the vicinity of excessive levels of airborne oil
or grease i.e. above or close to a cooker.
9. If it is intended to fit an extract terminal/grille
in a room containing a fuel burning appliance,
the installer must ensure that provision for air
replacement is adequate for both appliances
and is in compliance with the requirements of
Part F of the current edition of the Building
Regulations.
2.0 Site Requirements
5

2.0 Site Requirements
6
2.1 Information (cont)
10. The external grilles/terminals for the system
must be sited at least 1m away from the flue of
a fuel burning appliance, in compliance with the
requirements of Local Authority, Building
Regulations and any other relevant Codes of
Practice.
11. All safety regulations and requirements must
be strictly followed to prevent hazards to life
and property both during and after installation
or servicing.
12. Ensure that the mains electrical supply is
switched off before commencing installation,
maintenance or servicing.
13. Fire compartmentation must be maintained
to comply with the requirements of the current
edition of the Building Regulations. Where
applicable fire dampers complying with the
recommendations of BS CP 5588: Part 9 will
require to be installed in the ducting installation.
14. Do not locate fittings (QTET, QTB90,
QTB45) closer than 2.5 diameters to each other
or to supply/extract terminal (SV100/EV100).
15. Never locate tees (QTET) directly over or
adjacent to a terminal housing otherwise noise
will be generated.

3.0 Installation
7
3.1 Installing the Fan Unit
1. Check the diagrammatic ducting layout
drawing to ensure that the proposed duct
routes, fan unit and air terminal locations can
be accomodated. If in doubt refer to the
Technical Department.
2. The units are suitable for either vertical or
horizontal mounting. After noting the positions
of the electrical connector, duct spigots and
drainage connection on the unit, choose a
suitable installation site for the unit. The most
desirable location for the unit, in single and two
storey properties with a roof space, is in the
roof space.
3. Never locate the unit over a sleeping area -
above the landing or bathroom is always
preferred. 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.
Condensate Drainage
HR400
4. The condensate drain is supplied fitted to the
unit as shown (Fig. 4).
HR320
5. The unit is supplied with a 22mm diameter
condensate drain fitting, packed loose in the
box. The WH unit casing is moulded with two
22mm diameter drainage spigots in the bottom
corners. The casing of the unit can be set up for
right hand or left hand drainage by cropping the
domed end off either one of these spigots and
pushing on the condensate drain fitting (Fig. 5).
6. The units 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. Parts ref. CP, CPC and CPE are
included with the kit. Connect the drainage
system using the parts provided, jointing the
PVC pipework and fittings using PVC cement to
form watertight joints.
NOTE: Trap should be charged/filled before
operating the system and should be
checked, especially in summer.
BEWARE: A blocked condensate outlet pipe
due to insufficient pipe run (gradient) will
quickly lead to water damage.
Condensate Drain
HR400
HR320
Condensate Drain
Fig. 4
Fig. 5

3.0 Installation
8
Top Cover
Fig. 7
Fig. 6
Heat Exchanger
Filter
Drain
Outlet
Condensate
Trap
Joists
Inclined
Platform
Acoustic Mat
Condensate
Drain
Mounting Pad
3.1 Installing the Fan Unit (cont)
Horizontal Mounting (Fig. 7)
7. Before installation of the fan unit, a wooden
platform must be provided to mount the unit on.
8. The platform should be constructed from
50mm x 100mm timber bearers with a 19mm
block board deck.
9. The platform should incline the unit to ensure
a fall to the drain outlet. An acoustic mat
(ACMW/HOUSE) can be fitted on top of the
board to minimise vibration.
10. Remove the top cover and withdraw the
heat exchanger from the casing. Carefully drill
four holes through the mounting pads.
11. Secure the casing to the platform deck
using four No.8 round head screws and large
pattern washers to dissipate the load (Fig. 6).

3.0 Installation
9
3.1 Installing the Fan Unit (cont)
Vertical Mounting HR400 (Fig. 8)
12. The HR400 can be mounted
vertically by securing with plugs and screws
through the casing (see horizontal mounting).
Vertical Mounting HR320
The HR320 is supplied with a wall mounting kit.
13. Hold the unit against the wall and mark the
horizontal base line.
14. Remove the unit and position the mounting
channel on the line.
15. Mark through the three holes and drill and
plug them (Fig. 11).
16. Secure the mounting channel to the wall
using the screws provided (Fig. 11).
17. Locate the unit’s lower mounting rib in the
channel and mark the position of the upper
slotted mounting lug. Drill and plug the wall
(Fig. 9).
18. Secure the unit to the wall ensuring a large
pattern washer is used on the fixing lug (Fig. 9).
HR400
HR320
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Mounting Channel
Securing Screw
and Washer
Upper slotted
Mounting Lug

3.0 Installation
10
3.2 Installing the Ducting System
1. Cut off the closed ends of the duct spigots
that are to be connected to the duct system.
Ensure that no cutting debris falls into, or
remains in the unit as this could damage the
balanced impellers and cause excessive noise
and vibration.
2. 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.
3. Place the terminal housing in the hole in the
ceiling and secure to the back ring with the four
screws provided.
4. 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
(Fig 12).
5. 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.
6. Fix in position all vertical supply and extract
air ducting being conveyed between ground
floor ceiling level and the loft space (Fig 13).
Terminal Housing
Plaster Board
Securing Ring / Back Plate
(for fire valves)
Securing Screw
Terminal
Supply and Extract Air Terminals SV100 / EV100
Typical Installation
QT3
Joist
RD040
Floor Boards
Joist Direction
Terminal Housing
Plaster Board
EV100/SV100
RD015
Fig. 12
Fig. 13