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

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

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.

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

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

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

HR205

Fig. 5

Fig. 3

Fig. 4

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

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

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

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.

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

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

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