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
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24
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30
35

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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

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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

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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

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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

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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