Vent-Axia HR205 User guide

Please leave these instructions with the user
Whole House Ventilation System
with Heat Recovery and Cooker Hood (HR205)
User, Installation & Servicing
Instructions

2
Contents
Section
1.0 User Information
2.0 General Layout
3.0 Technical Data
4.0 Appliance Operation
5.0 Installation Requirements
6.0 Installation
7.0 Wiring Diagrams
8.0 Commissioning
9.0 Maintenance
10.0 Changing Components
11.0 Fault Finding
12.0 Short Parts List
Page
3
6
8
10
11
14
18
22
24
26
30
35

3
1.0 User Information
The HR204 (Fig. 1) and HR205 (Fig. 2) are
whole house ventilation units.
This appliance must be installed in accordance
with the manufacturers’ instructions and the
regulations in force.
Duct systems must be installed in accordance
with CIBSE guides and BRE Digest 398.
Read the instructions fully before installing or
using the appliance.
Warning :The ventilation for any open
flued appliance must always be
considered before siting the extract and
inlet vents, the vents must also be sited
away from other flue terminals, ventilators
etc. on the outside of the dwelling. In
addition there shall be adequate
ventilation of the room when the cooker
hood is used at the same time as
appliances burning gas or other fuel.The
exhaust air duct must not be discharged
into a flue which is used for exhausting
fumes from appliances burning gas or
other fuels. Refer to the relevant current
British Standard Codes of Practice, Part J
of the Building Regulations England and
Wales and Part F of the Building
Standards (Scotland) Regulations.

4
1.0 User Information
• HR204
Important:The HR204 is not suitable for
installation above any cooking
appliance.
The HR204 is a mechanical ventilation
with heat recovery (MVHR) unit.The unit
provides continuous extraction of stale air
from the dwelling typically from the
bathroom and from the kitchen.The stale
air passes through the heat exchanger
before being ducted to outside.
Fresh air from the outside is continuously
drawn into the unit and passed through a
filter and then into the heat exchanger. In
the heat exchanger the fresh air is pre-
warmed and ducted into the dwelling
typically to living rooms/ bedrooms.
• HR205
The HR205 is a mechanical ventilation
with heat recovery (MVHR) unit, designed
solely to operate with the Vent-Axia telescopic
cooker hood.The unit provides continuous
extraction of stale air from the dwelling
typically from the bathroom and the
kitchen.The stale air passes through the
heat exchanger before being ducted to
outside.
Fresh air from the outside is continuously
drawn into the unit, passed through a filter
and then into the heat exchanger. In the
heat exchanger the fresh air is pre-
warmed and ducted into the dwelling
typically to living rooms/ bedrooms.
When the telescopic hood is extended the
MVHR unit switches automatically to
boost.The hood draws steam and fumes
from cooking through metal filters and
direct to outside.
Important:The cooker hood must
always be fully opened when the cooker
/hob is in use.
Warning: Do not flambé under the
cooker hood

5
1.0 User Information
Cleaning the Unit
Warning: Disconnect from mains electrical
supply before cleaning any components.
Note: It is important that any door or
cupboard front covering the MVHR unit is
easily removable by the user as access for
regular cleaning of the air filters and heat
exchanger is required.
Warning: Failure to clean the cooker hood
and its filters as described below will lead
to a fire risk.
The cooker hood and filters should be
checked and cleaned every 3 months.
1.1 Heat Exchanger -HR204 & HR205
1. Lift off the front door panel by releasing the
two hand screws and lifting upwards.
2. Note how the heat exchanger is fitted and by
using the plastic strap pull forwards to remove.
3. If necessary the heat exchanger can be
washed in warm water using a mild detergent.
Take care not to damage the fins.Re-assemble
in reverse order after thoroughly drying.
1.2 Air Inlet Filter - HR204 & HR205
Fig. 4
1. Lift off the front door panel by releasing the
two hand screws and lifting upwards.
2. Remove the air inlet filter by pulling forwards.
3. Carefully brush and vacuum the filter in a well
ventilated area.
4. Re-assemble in reverse order.
1.3 Cooker Hood Filters - HR205
Fig. 5
1. Rear Filter - To remove the rear filter grip and
pull inwards the grey handles at either side and
slide the filter forwards and downwards.
2. Front Filter - To remove the front filter grip and
pull inwards the grey handles at either side and
drop the filter downwards.
3.The filters can be washed in a dishwasher or
in warm soapy water.Thoroughly dry the filters
and re-assemble in reverse order.
Note: For spare parts see Section 12.
Warning
WiringService
FRONT
UP
Pull forward & remove
the outer case
Release hand
fastners
Use strap to pull
out heat
exchanger.
Remove the cooker hood filters for cleaning
View from below the unit
Air inlet
filter pull
out, brush
& vacuum
clean
WHC0006A
FRONT
UP
HR205
Fig. 5
Fig. 3
Fig. 4

6
2.0 General Layout
Cover Panels removed for clarity.
1. Heat Exchanger (Lexan)
2. Fan (Fresh Air In)
3. Fan Capacitor (RH)
4. Electrical Control/Transformer
5. Fuse (3.15amp fast blow)
6. Terminal Block
7. Overheat Sensor
8. Lower Fixing Hole
9. Fire Damper
10. Condensate Drain (15mm)
11. Condensate Tray
12. Alternative outlet for condensate
13. Fan (Extraction)
14. Fan Capacitor (LH)
15. Inlet Air Filter
16. Air Connections (4 off)
Fig. 6
HR205

7
2.0 General Layout
HR204
Cover Panels removed for clarity
1. Heat Exchanger (PVC)
2. Fan (Fresh Air In)
3. Fan Capacitor (RH)
4. Electrical Control/Transformer
5. Fuse (3.15amp fast blow)
6. Terminal Block
7. Lower Fixing Hole
8. Alternative outlet for
condensate (bottom)
9. Condensate Drain (15mm)
10. Condensate Tray
11. Alternative outlet for
condensate (side)
12. Fan (Extraction)
13. Fan Capacitor (LH)
14. Inlet Air Filter
15. Air Connections (4 off)
Fig. 7

8
3.0 Technical Data
HR205 HR204
Including cooker hood
Dimensions (mm)
Height 458 412
Width 598 552
Depth 285 285
Min.Clearances (mm)
Both sides 1 5
Above casing 200 200
Below casing 700 100
Front for servicing 250 250
Front in operation None None
Lift weight (kg) 20.6 16.7
Voltage tappings Power consumption (watts) Power consumption (watts)
Lights off Lights on
80 16 96 16
100 27 107 27
120 40 120 40
140 52 132 52
160 65 145 65
230 111 191 111
Duct connections All suitable for 100mm circular ducts
Condensate connection Suitable for 15mm pipe
Electrical supply 230v –50Hz appliance must be connected to an earthed supply
External fuse rating 3 amps
Internal fuse rating Transformer - 3.15 F
Filtration EU2

9
3.0 Technical Data
WHC0022A
The MVHR unit
has five normal
fan speed
settings and
one boost
setting. The
performance
curve chart
gives the
ventilation rates
at each fan
speed setting
compared to the
pressure drop
of the system.
0
50
100
150
300
350
250
200
0 2010 30 50 7040 60 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230
100Pa @
100m³/Hr
240
Pressure / Pa
Flow rate / m³ / hr
Flow Rate Vs Pressure Chart
80v
100v
120v
140v
160v
230v
Fig. 8
Fig. 9

10
4.0 Appliance Operation
•HR204
When the electricity is switched on the external
controls (humidstat or normal/boost switch)
supply electricity to the fans.
On normal running the fans run at the voltage
set during commissioning (80,100,120,140 or
160 volts).
Air is then moved through the unit (see Fig 8) If
the fans become jammed then a thermal trip in
the fan senses temperature rise and breaks the
electrical supply to the motor. This can only be
reset by disconnecting from the mains
supply.
If the external controls call for boost operation
the fans automatically run at 230 volts and
increase the air movement of both exhaust and
inlet air.
•HR205
When the electricity is switched on the unit
checks for continuity across the overheat
thermostat.
The fans then run at the voltage set during
commissioning (80,100,120,140 or 160 volts).
Air is then moved through the unit (see Fig 8) If
the fans become jammed then a thermal trip in
the fan senses temperature rise and breaks the
electrical supply to the motor. This can only be
reset by disconnecting from the mains
supply.
If the overheat thermostat senses an elevated
rise in temperature from the cooker/hob it breaks
the electrical supply to the fans.The overheat
thermostat can only be reset by
disconnecting the mains supply to the unit.
In the event of a serious fire at the hob (e.g. chip
pan fire) the in built fire damper will operate
sealing the clean air side of the unit from the fire.
Continuous extract
typically from
bathroom/kitchen.
Continuous supplying
of fresh filtered
air typically to
living room/ bedroom.
Lights on the Cooker
Hood can be used.
Optional Extras
External Controls
Normal/boost
Switch
NBSW
Normal/boost
Pull Switch
PCSW
Humidity Sensor
HS6
Cooker
Hood
Open
Cooker
Hood
Closed Increased extract rates,
also extract from
Cooker Hood.
Increased supply to
living room/bedroom.
Lights on the Cooker
Hood can be used.
Power ON
Normal Operation
Fans run in whole
house mode at 80, 100,
120, 140, or 160 Volts.
Boost Operation
Fans run at 230 Volts.
WHC0021A
Normal
Boost
Fig. 10

11
5.0 Installation Requirements
5.1 Location
1. The cooker hood MVHR unit is only suitable
for installation above a domestic cooker or
domestic hob. The HR205 must be sited a
minimum of 700 mm above the cooker/hob.
2. The exhaust duct must pass through an
outside wall or roof and discharge to atmosphere
in a suitable position .The clean air inlet duct
must pass through an outside wall or roof and be
suitably positioned to provide an adequate fresh
air supply from atmosphere.
5.2 Site requirements
1. For the HR205 a flat vertical area 1332mm
high x 600mm wide is required for installation.
For the HR204 a flat vertical area 692mm high x
562mm wide is required for installation.
Important: The HR204 is not suitable for
installation above any cooking appliance
or with any extraction system servicing
a cooking appliance.
2. Before installation consideration must be
given to the position of the ductwork
connections, the electrical connection and the
condensate pipe connection.
Warning: Please check the information on
the data plate is compatible with local
supply conditions.
3. The installation must be carried out by a
competent person and be in accordance with the
relevant Building regulations (Scotland)
(consolidation), the Local building regulations,
the current I.E.E. Wiring regulations.
Reference should also be made to the BRE
digest 398 and CIBSE guidelines.
Warning: The addition of anything that
may interfere with the normal operation of
the appliance without the express written
permission of Vent-Axia Ltd could
invalidate the appliance warranty and
infringe regulations.
Warning: If the unit is fitted in a room
containing a bath or shower then
reference should be made to the current
I.E.E. Wiring Regulations and Building
Regulations.

12
5.0 Installation Requirements
5.3 General
1.The MVHR unit has five normal fan speed
settings and one boost setting.The
performance curve chart (Section 3, Fig. 8)
gives the ventilation rates at each fan speed
setting compared to the pressure drop of the
system.
2.The transmission of noise along ducts should
be reduced by fitting noise attenuation ducts
Part No. FS100.
5. 4 Ducting
1.The outside exhaust duct and outside air
intake duct should be sited a minimum of 1
metre apart to minimise the risk of contaminated
air being drawn into the house.
2.The duct work system should be sized and
installed to minimise the pressure loss along it.
3. Using larger diameter pipes and keeping the
number of bends and fittings used to a minimum
will reduce the pressure drop and allow the unit
to be set at a lower fan speed.
4. Ducting should be insulated in cold areas to
minimise heat losses.All duct joints should be
suitably taped to ensure an air tight seal.
WHC0010A
Exhaust out
Fresh air in
Hot stale air in
Warm air out
Examples of different ducting & fittings
NQT100
NQT100
IQTB45
IQTB90
RD104WHRD104WH
IQTB45 IFD100
NQT40
1m
NQT100
1m
0.25m
or
NQT100
NQT40
OR
RD060
RD060
RD015
RD015
EV100
SV100
RD015
RD070
Bathroom
Living
Room
1.5m
Terminals
minimum
1m apart
Outside
Wall
HR205
Fig. 13

13
5.0 Installation Requirements
Warning : The ventilation for any open
flued appliance must always be
considered before siting the extract and
inlet vents, the vents must also be sited
away from other flue terminals, ventilators
etc. on the outside of the dwelling. In
addition there shall be adequate
ventilation of the room when the cooker
hood is used at the same time as
appliances burning gas or other fuel. The
exhaust air duct must not be discharged
into a flue which is used for exhausting
fumes from appliances burning gas or
other fuels. Refer to the relevant current
British Standard Codes of Practice, Part J
of the Building Regulations England and
Wales and Part F of the Building
Standards (Scotland) Regulations.
5.5 System controls
1. An optional Humidistat (HS6) Part No. 370254
is available for automatic boost control.
2. An optional boost switch (NBSW) Part No.
370495 is available for manual/boost control
remote from the unit. An optional pull cord boost
switch (PCSW) Part No. 370278 is available for
manual/boost control remote from the unit.
5.6 Electrical supply
1. External wiring must be correctly earthed ,
polarised and in accordance with the current
I.E.E. Regulations.
2. The mains supply must be 230v ~ 50Hz fused
at 3amps
Note: The method of connection to the
mains supply must facilitate complete
electrical isolation of the appliance.
Connection may be via a fused double
pole isolator with a contact separation of
at least 3mm in all poles and supplying the
MVHR unit and its system controls only.
5.7 Condensate drain
1. The condensate pipe should have a
continuous fall of 10° (1 in 6) with as much of the
condensate pipe as possible run inside the
property to avoid freezing. The pipe should also
incorporate a trap with a minimum height of
75mm. See Fig. 17.
2. The HR205 has two alternative condensate
outlet positions: - rear and left hand side
.
The
HR204 has three condensate outlet positions: -
rear, bottom and left hand side.
Fig. 14

14
Exhaust
Out
FreshAir
In
Hot Stale
Air In
Warm Air
Out
Measure 700mm
from hob
HR205
HR204
Top of hob
Example of a possible
understairs installation
Mark out the
position of the
unit of the
Wall Template
Ground Floor
Stair Case
Make sure the Wall
Template is level
Mark position
of the
condensate
pipe 15 mm
(drill where
required)
Mark position
of the
fixing holes
2 top (minimum)
& 1 lower
then drill & plug
WHC0013A
Wall Template HR204 &
HR205 (with cooker hood)
Whole House Ventilation System
Exhaust
Out
Fresh Air
In
Hot Stale
Air In
Warm Air
Out
Minimum
Top
Clearance
200mm
Part No. 372706
98mm
Cooker Hood
Bottom of
MVHR Unit
Bottom of
Cooker Hood
Top of
MVHR
Unit
Bottom of
Mounting
Brackets
4 Fixing Holes
(Key Holes)
Use one
hole each side
Bottom
Fixing Hole
Back Case
Condensate Hole
Side Case Knock
Out Condensate Hole
Minimum Side
Clearance 1mm
Minimum Side
Clearance 1mm
Bottom Condensate
Pipe Exit (HR204 Only)
Minimum Bottom Clearance
100mm
(HR204 Model)
Minimum Side
Clearance
24mm
(HR205c)
Minimum Side
Clearance
5mm
(HR204)
MVHR
Side
Minimum Side
Clearance
24mm
(HR205c)
Minimum Side
Clearance
5mm
(HR204)
MVHR
Side
All dimensions
in mm
MinimumTop
Clearance
forser vicing
200
Minimum
Side
Clearance
5
Minimum
Side
Clearance
5
Clearances
HR204
MinimumBottom
Clearance
100
Minimum
Front
Clearance
for
servicing
250
280
Clearances
HR205c
Minimum
Side
Clearance
(MVHR)
24
Minimum
Side
Clearance
(MVHR)
24 Minimum
TopClearance
forser vicing
200
300
Minimum
Front
Clearance
forser vicing
250
MinimumBottom
Clearance fromHob
700
Minimum
Side
Clearance
(C.Hood)
1
Measure Minimum
Bottom Clearance
700mm
From Hob
(HR205c Model)
Mains
Cable
Outlet
6.0 Installation
6.1 Preparation
1. Check site requirements (Section 5) before
commencing.
2. Remove the fixing template from the MVHR
carton.
After considering the site requirements position
the template on the wall ensuring it is level.
3. Mark the positions of at least two top fixing
holes, the lower fixing hole and the condensate
outlet.
If required mark off the positions of the four duct
connections.
4. Drill and plug the wall at the fixing points
and drill the condensate hole.
5. The top two screws should now be fitted
leaving enough space for the keyhole fixing slots
to engage.
6. Place the MVHR unit on its back (Fig. 15). Lift
off the front door panel by releasing the two
hand screws and lifting upwards.
7. Remove the bottom electrical cover by
releasing the 3 screws, pulling the panel
forwards and disconnecting the earth lead to the
panel.
Fig. 15

15
6.0 Installation
6.2 Assembly of the MVHR unit and the
cooker hood - HR205 only.
1.Unpack the cooker hood, locate the four
screws and washers and the protective box for
the cooker hood plug and socket.
2. Open out the telescopic hood and remove the
two metal filters by releasing the grey plastic
springs and sliding out.
3.Offer up the hood to the MVHR unit and
carefully feed the cable and four pin cooker hood
socket through the hole in the back right hand
side of the MVHR unit.
4.Align the cooker hood and attach it to the
MVHR unit using the four screws provided.
Note: it will be necessary to support the
telescopic hood when attaching it to the
MVHR unit.
5.Carefully route the cooker hood cable and
socket into the MVHR unit and engage it with the
plug ensuring the locating lugs align.
It is important that the cables are routed away
from the cooker hood outlet and fire damper.
6.Locate the assembled plug and socket in the
protective box taking care to route the cables as
shown (Fig. 16). Clip the box together and
secure using the screws provided. Locate the
large cable grommet in the hole and ensure it is
seated correctly.
6.3 Condensate outlet
1.If the condensate pipe is to exit the unit at the
left hand side, stand the unit up on its base
taking care not to damage the telescopic hood
and filters.
2. Locate the semi-pierced hole and carefully
remove the metal disc.
3.Swap over the grommet used on the rear exit
hole and seal the rear hole with duct tape or
similar.
Note:TheHR204 has an extra condensate
outlet on the bottom panel.
Fig. 16
Secure Cooker Hood to MVHR
Unit with 4 screws supplied
Top View (MVHR Unit
placed on it's back)
Warning
MVHR
Unit
Connect
Cooker
Hood
WHC0032A
Grommet
Correct route for cooker hood cable
connection (HR205)
Cable
Clips
Remove
the
Cooker
Hood
filters
before
fitting
Cooker
Hood to
MVHR
Unit
View from below the unit
Use a
packing
piece to
hold
open
the
cooker
hood
FRONT
UP
HR205
The cable
must be
routed clear
of the fire
damper
Connector
Clamp the
Protective Box
around the
Connector
Grommet

16
6.0 Installation
6.4 Fitting the MVHR unit
1. Offer the combined unit to the wall and
engage the keyhole slots over the screws
previously fitted.
2. Make sure the unit is level and tighten the top
screws before engaging the final screw.
6.5 Making the condensate connection
1. The condensate connector is suitable for 15
mm pipe.
2. The condensate pipe should incorporate a
water trap to prevent foul air being drawn into the
unit. The minimum height of the trap should be
75 mm.
Note: To ensure the condensate pipe is
primed, slowly pour water into the
condensate tray until it discharges into
the drain.
Fig. 17

17
6.0 Installation
6.6 Making the duct connections
1. The unit has four duct connections suitable for
100mm plastic pipe.
1. Exhaust outlet to outside
2. Air inlet from outside
3. Stale air inlet from dwelling
4. Fresh air outlet to dwelling
Notes: It is essential that the duct system
is connected as indicated.
It is important that the duct system does
not interfere with the correct fitting of the
outer door and does not prevent the
correct operation of the unit.
6.7 Controls
1. The HR204 requires external controls to
enable normal/boost switching, see Page 20 -
Wiring Diagrams.
2. The HR205 can have optional external
controls fitted, see Pages 18 and 19 - Wiring
Diagrams.
6.8 Making the electrical connection
Warning: This appliance must be earthed
1. The normal running speed of the fans is set at
120v.
2. The unit must be set to the appropriate
voltage as determined by air flow required and
duct system pressure loss (see Section 5.3).
To change the voltage setting for the fans,
unscrew and remove the white wire from the
120v connection on the controller.
3. Carefully insert the wire into the desired
connection (80, 100, 120, 140 or 160) and
secure the wire.
4. Fit the bottom cover panel.
5. Connect the flying lead to the mains supply -
see Section 5.6.
6. Check the electrical installation for; Earth
continuity, short circuits, resistance to earth and
correct polarity.
WHC0009A
Fit bottom cover panel.
Position the white lead
for the required fan speed
setting, (160v fast to 80v slow
available) 120v shown.
L
N
160
140
120
100
80
Warning
WiringService
HR205
FRONT
UP
Fig. 18

18
7.0 Wiring Diagrams
1
2
3
4
Overheat Thermostat
To Cooker Hood Earth for
Inspection
Panel
To MVHR
For
External
Controls
Fan
(air out)
Controller
L
N
160
140
120
100
80
O
B
C
b
bk
bk
b
grgr
gr
gr
w
w
br
br
w
br
br - Brown
g/y - Green/Yellow
p - Purple
bk - Black
Key Colors
b - Blue
gr - Grey
r - Red
w - White
L
N
L
L
N
NFuse (3.15AT)
Fan
(air in)
r
r
r
r
b
b
g/y
g/y
g/y
b
gr
gr
br
br
c
boost
speed
230v bulb
40 watts
bulb
40 watts
p
p
WHC0031A
br
br
b
Light Switch
Micro Switch
Mains
In
230v g/y
br
b
g/y
br
b
b
b
b
br
br
b
b
b
Fig. 19
HR205 MVHR Unit Wiring
HR205 Cooker Hood Wiring

19
7.0 Wiring Diagrams
HS6 Humidistat
0
2
1
Common
Boost
Ordinary
N
L
N
L
Manual Normal /Boost
Switch NBSW or
Pull Switch PCSW
Common
Boost
Normal
c
1
2
3
4
Remove Link
Overheat
Thermostat
Overheat
Thermostat
To Cooker Hood Earth for
Inspection
Panel
Fan
(air out)
Controller
L
N
160
140
120
100
80
O
B
C
b
bk
bk
b
gr
gr
gr
gr
w
w
br
br
w
br
br - Brown
g/y - Green/Yellow
p - Purple
bk - Black
Key Colors
b - Blue
gr - Grey
r - Red
w - White
L
N
L
N
Fuse (3.15AT)
Fan
(air in)
r
r
r
r
b
b
g/y
g/y
g/y
Mains
In
230v
g/y
br
b
g/y
br
b
b
b
b
br
br
b
b
b
1
2
3
4
Remove Link
To Cooker Hood Earth for
Inspection
Panel
Fan
(air out)
Controller
L
N
160
140
120
100
80
O
B
C
b
bk
bk
b
gr
gr
gr
gr
w
w
br
br
w
br
br - Brown
g/y - Green/Yellow
p - Purple
bk - Black
Key Colors
b - Blue
gr - Grey
r - Red
w - White
L
N
L
N
Fuse (3.15AT)
Fan
(air in)
r
r
r
r
b
b
g/y
g/y
g/y
WHC0011A
Mains
In
230v
g/y
br
b
g/y
br
b
b
b
b
br
br
b
b
b
Fig. 20
HR205 MVHR Unit Wiring with optional
Humidstat HS6
HR205 MVHR Unit Wiring with optional
Normal/Boost Switch

20
7.0 Wiring Diagrams
Fig. 21
1
2
3
4
Earth for
Inspection
Panel
For
External
Controls
For
External
Controls
Fan
(air out)
Controller
L
N
160
140
120
100
80
O
B
C
br
br
br - Brown
g/y - Green/Yellow
p - Purple
bk - Black
Key Colors
b - Blue
gr - Grey
r - Red
w - White
L
N
L
L
N
N
Fuse (3.15AT)
Fan
(air in)
r
r
r
r
b
b
g/y
g/y
g/y
WHC0033A
Mains
In
230v g/y
br
b
g/y
br
b
b
b
b
br
br
b
b
b
HR204 MVHR Unit Wiring