Vent-Axia HR25H Assembly instructions

Lo-Carbon

HR25

Single Room Heat Recovery Unit

Installation and Wiring Instructions

Stock Ref. N°

372261A HR25

372262A HR25H

372263A HR25P

372264A HR25L

372265A HR25LH

372266A HR25LP

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS.

PLEASE SAVE THESE INSTRUCTIONS

372268 -

1.0Introduction 3

2.0Site Requirements 4

3.0Installation 5

4.0Maintenance 13

5.0Short Parts List 14

Section Page

Contents

1.0 Introduction

372268 -

1.1 Description

1. The Vent-Axia HR25 range of products are

“through the wall”heat recovery ventilators for

use in areas such as bathrooms and WCs.

2. The units are fitted with a 24V DC motor and

are supplied with a Switch Mode Power Supply

(S.M.P.S.). On normal setting the power

consumption is 2 Watts.

A 5m cable is provided for fixed wiring of the

unit to the S.M.P.S.

3. The twin impeller and heat exchanger

arrangement simultaneously supplies and

extracts air while transferring heat from the

stale exhaust airflow to the fresh intake airflow.

This provides up to 84% heat recovery from the

stale extracted air.

4. The range of products is as follows:-

HR25

The HR25 is fitted with a pull cord switch which

provides a twin speed control function.

HR25H

The HR25H is fitted with an adjustable humidity

sensor which automatically switches between

its high and low settings depending on the

relative humidity in the room of installation.

HR25P

The HR25P has an Infra-Red sensor which

detects a person moving in the room, which

then activates the unit to switch to its higher

setting. This unit can operate under two different

modes, direct action and delayed action.

HR25L, HR25LH and HR25LP

These are extended versions of the above

models. They are designed for installations

where the wall thickness is between 311mm

and 425mm.

Fig. 1

Fig.2

Fig.3

2.0 Site Requirements

2.1 Information

1. The unit is designed for installation in

external walls with a thickness of up to 310mm.

For wall thicknesses above 310mm, the ‘L’

version of the appropriate model must be used

(see page 12 ). The ‘L’ models are suitable for wall

thicknesses up to 425mm.

2. The unit must be sited and connected by a

suitably competent person and be in

accordance with current U.K. Building

Regulations and I.E.E. Wiring Regulations (BS

7671).

3. The unit must be installed in conjunction with

the separate power supply supplied,

which is intended for permanent connection to

the mains electrical supply. The unit and the

power supply are intended for fixed

wiring installation.

4. The power supply requires free air

circulation for effective operation It must not be

recessed into the mounting surface or covered

with any form of insulation, which might be used in

a ceiling or roof void. The unit must be sited such

that the ambient temperature will not exceed 40°C.

please ensure that the air vents on the enclosure

are not blocked or covered up.

5. Wiring to the unit in the U.K. must be via

a switched fused spur.

6. The spur should have a minimum contact gap

of 3mm in all poles.

7. Ensure that the mains electrical supply is

compatible with the rating label attached to the

product.

8. The unit must be sited such that the ambient

temperature will not exceed 40°C.

9. Do not site the appliance in the vicinity of

excessive levels of airborne oil or grease. or

directly over a cooker.

10. If the unit is installed in a room containing a

fuel burning appliance, the installer must ensure

that air replacement is adequate for both

appliances.

11. The unit must not be installed at a level

below 500mm from the floor.

12. The internal grille surround must be sited at

least 125mm away from the room ceiling (Fig. 3).

and 300mm away from any adjacent vertical

surface.

13. The external cowl of the unit must be sited

at least 500mm away from any flue of gas or

solid fuel appliances. This is to avoid back flow

of gases entering the room.

14. 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.

15. Ensure the mains electrical supply is

switched off before commencing installation or

maintenance.

2.0 Site Requirements

50mm minimum

3.0 Installation

372268 -

3.1 Initial Preparation

The unit is designed for installation in a 152mm

(6”) core drilled hole.

All installation can be undertaken from inside

the building except for fixing of the external

bezel if required.

1. After considering the site requirements (see

previous section), select a suitable position for

the unit and power supply enclosure (5m

maximum between unit and power supply).

2. Remove the unit fixing template from the rear

of the instructions.

3. Mark the position of the four fixing holes and

the mounting hole.

4. Cut the mounting hole to a diameter of

152mm (6”) using a core drill. Ensure that there

is a slight fall on the hole, from inside to outside

(Fig. 4).

5. Drill and plug the four fixing holes.

Install the fixed cable runs using mini-trunking

or via concealed installation. A 3-core red, white

and black low voltage cable is supplied for

connections between the unit and the power

supply.

6. Using the template supplied mark the

position of the four fixing holes for the power

supply enclosure. Drill and plug the holes.

7. Ensure the cable to the unit extends

sufficiently from the mounting hole to enable

the required connections within the control

enclosure.

1°

Outside Inside

Fig. 4

Fig.6

Fig.7

HR25 / HR25L ONLY

Disconnect and make safe

White wire for High speed/Off

Fig.8

HR25 / HR25L ONLY

Disconnect and make safe

Red wire for Low speed/Off

Fig.9

3.0 Installation

3.2 Installing the Power Supply Unit

1. Remove the power supply unit assembly

from the carton. (Fig.6)

2. Remove the power supply unit packaging.

3. The mains input to the power supply unit

must be routed via the rear of a single gang

surface mounted back box (not supplied).

NOTE: Mains wiring must be kept separate

from the SELV wiring.

The mains connection is to the terminals

marked L & N (Fig.7)

4. Feed the 3-core cable through the rear of the

back box.

5. Mark the fixing hole positions in the back box

(not supplied) then Drill and plug the wall to

secure the power supply enclosure using the

fixing screws provided.

6. Connect the 5m cable supplied to the red,

white and black low voltage supply via the

terminal block. (Fig. 7)

NOTE: Red is positive high speed, white is

positive low speed and black is negative.

This polarity must be maintained at the unit

connections.

HR25/HR25L ONLY

The HR25/HR25L units are factory set to

opearate continuously at high or low speed

via a pull cord switch.

Two alternative settings can also be

achieved by disconnecting and making safe

the respective wires at the cable end of the

terminal block within the power supply

enclosure. The settings are as follows:-

High speed / Off – Disconnect White (Fig.8)

Low speed / Off – Disconnect Red (Fig.9)

N.B For all other models, refer to the

respective installation page.

SELV Supply

24V

0V8V

RED

WHITE

BLACK

220-240V~50Hz

REF: 447249

0-24V D.C

RED

BLACK

WHITE

SELV Supply

24V

0V8V

RED

WHITE

BLACK

220-240V~50Hz

REF: 447249

0-24V D.C

RED

BLACK

WHITE

SELV Supply

24V

0V8V

RED

WHITE

BLACK

220-240V~50Hz

REF: 447249

0-24V D.C

RED

BLACK

WHITE

Power supply unit

Located here

3.0 Installation

372268 -

3.3 Installing the HR25

1. Remove the unit, bezel and fixing pack from

the carton.

2. Unclip the removable grille from the unit and

remove filter (Fig. 10).

3. Loosen the two securing screws and remove

the grille surround (Fig. 11).

4. Remove the divider board (Fig. 11).

5. Measure the total wall thickness. The outer of

the two rubber seals is adjustable and should

be set in a position that is 25mm in from the

outer face of the external wall (Fig. 12).

6. Secure the rubber seal to the unit using the

adhesive provided.

7. Locate the unit in the mounting hole, but do

not push it fully in.

8. Route the low voltage cable from the power

supply enclosure to the unit.

9. Pass the low voltage cable through the cable

entry grommet at the top of the unit

(Fig. 14).

10. Secure the unit to the wall using the four

fixing screws provided.

11. Remove the control cover by undoing the

two retaining screws (Fig. 14).

12. Strip the low voltage cable sheath back

40mm from the end and separate the three

individual wires.

13. Connect the wires to the terminal block.

Connect red to red, white to white and black to

black (Fig. 13 & 14).

14. Ensure that the low voltage cable is routed

through the divider slot (Fig. 14).

15. Reassemble in reverse order ensuring the

divider board seals against the heat exchanger.

16. A bezel is provided to neaten the

appearance of the outside wall around the unit.

If required this should be fixed in place using a

suitable silicone/mastic sealant.

Fig. 10

Fig. 11

Fig. 14

Fig. 13

Filter

Removable Grille

Divider Board

Heat

Exchanger

Grille Surround

Securing Screws

Pull Switch

Motor Wires

Control Cover

External Bezel

Control Cover

Cable Entry Grommet

Divider Slot

Low Voltage

Terminal Block Wiring

Label

White

Red

Motor

Switch

From Power

Supply Enclosure

Black

White

Red

Black

Fig. 12

Outside

Wall

Rubber

Seal

25mm

3.0 Installation

372268 -

3.4 Installing the HR25H

1. Remove the unit, bezel and fixing pack from

the carton.

2. Unclip the removable grille from the unit and

remove filter (Fig. 20).

3. Loosen the two securing screws and remove

the grille surround (Fig. 21).

4. Remove the divider board (Fig. 21).

5. Measure the total wall thickness.

The outer of the two rubber seals is adjustable

and should be set in a position that is 25mm in

from the outer face of the external wall (Fig. 22).

6. Secure the rubber seal to the unit using the

adhesive provided.

7. Locate the unit in the mounting hole, but do

not push it fully in.

8. Route the low voltage cable from the power

supply enclosure to the unit.

9. Pass the low voltage cable through the cable

entry grommet at the top of the unit

(Fig. 24).

10. Secure the unit to the wall using the four

fixing screws provided.

11. Carefully remove the control cover by

undoing the two retaining screws. Take care not

to dislodge the sensor or strain the wires

(Fig. 24).

12. Strip the low voltage cable sheath back

40mm from the end and separate the three

individual wires.

13. Connect the wires to the terminal block.

Connect red to red, white to white and black to

black (Fig. 23).

14. Ensure that the low voltage cable is routed

through the divider slot (Fig. 24).

15. The HR25H unit is factory set to switch

between high or low speed. Two alternative

settings can also be achieved by changing the

position of the ‘jumpers’on the control board

(Fig. 23).

1 Off / Low speed

2 Off / High speed

3 Low / High speed (continuously running)

16. The switching point of the unit can be

adjusted between 60% - 90% humidity. It is

factory set to operate at 70% humidity at 25°C.

17. To adjust the humidity level, rotate switch (A)

as follows (Fig. 23):

a) For the unit to operate at a lower humidity

level, turn switch (A) anti-clockwise (Min. 60%).

b) For the unit to operate at a higher humidity

level, turn switch (A) clockwise (Max. 90%).

18. Reassemble in reverse order ensuring the

divider board seals against the heat exchanger.

19. A bezel is provided to neaten the appearance

of the outside wall around the unit. If required this

should be fixed in place using a suitable

silicone/mastic sealant.

Fig. 20

Fig. 21

Fig. 24

Filter

Removable Grille

Sensor

Divider Board

Grille Surround

Securing Screws

Control Cover

Sensor

External Bezel

Control Cover

Jumpers Fig. 22

Fig. 23

Outside

Wall

Rubber

Seal

25mm

SPEEDS

BLK

RED

L/H

O/H

O/L

SPEEDS

L/H

O/H

O/L

123

Switch (A)

Terminal Block

Divider Slot

Cable Entry

Grommet

3.0 Installation

372268 -

3.5 Installing the HR25P

1. Remove the unit, bezel and fixing pack from

the carton.

2. Unclip the removable grille from the unit and

remove filter (Fig. 25).

3. Loosen the two securing screws and remove

the grille surround (Fig. 26).

4. Remove the divider board (Fig. 26).

5. Measure the total wall thickness.

The outer of the two rubber seals is adjustable

and should be set in a position that is 25mm in

from the outer face of the external wall (Fig. 27).

6. Secure the rubber seal to the unit using the

adhesive provided.

7. Locate the unit in the mounting hole but do not

push it fully in.

8. Route the low voltage cable from the power

supply enclosure to the unit.

9. Pass the low voltage cable through the cable

entry grommet at the top of the unit

(Fig. 29).

10. Secure the unit to the wall using the four

fixing screws provided.

11. Carefully loosen the control cover by undoing

the two retaining screws. Slowly pull the cover

forwards. There are two sets of wires leading

from the PIR sensor in the control cover to the

control board. Note the position of these wires

and unplug them at the control board. Place the

control cover to one side (Fig. 29).

12. Strip the low voltage cable sheath back

40mm from the end and separate the three

individual wires.

13. Connect the wires to the terminal block.

Connect red to red, white to white and black to

black (Fig. 28).

14. Ensure that the low voltage cable is routed

through the divider slot (Fig. 29).

15. The HR25P unit is factory set to switch

between high or low speed. Two alternative

settings can also be achieved by changing the

position of the ‘jumpers’on the control board

(Fig. 28).

1 Off / Low speed

2 Off / High speed

3 Low / High speed (continuously running)

16. The unit is designed to operate under two

different conditions, these are as follows:

a) DIRECT ACTION:

This mode effectively means that the PIR sensor

will detect movement within the room and either

switch the unit on, or from the low to high speed

depending upon how it has been set (paragraph

15 above).

b) DELAYED ACTION:

This mode means that the PIR sensor will ignore

movement in the room for the first 2 minutes. This

mode has been designed for night time use of

toilets and bathrooms where brief visits will not

activate the unit.

Fig. 25

Fig. 26

Fig. 29

Filter

Removable Grille

Sensor

Divider Board

Grille Surround

Securing Screws

Control Cover

PIR Sensor

External Bezel

Control Cover

Jumpers Fig. 27

Fig. 28

Outside

Wall

Rubber

Seal

25mm

SPEEDS

BLK

RED

L/H

O/H

O/L

BLK

RED

CON 7

CON 5

Switch (A)

Terminal Block

Divider Slot

Cable Entry

Grommet

SPEEDS

L/H

O/H

O/L

123

3.0 Installation

372268 -

3.5 Installing the HR25P (cont)

If any movement is detected after the first 2

minutes, the unit will switch to its higher setting.

This mode has a reset which operates after 5

minutes.

17. Both modes have a timer setting which

determines the length of time the unit runs for

after the last movement detection. This time can

be adjusted using switch (A) between 2 - 27

minutes (Fig. 30).

To increase the time;

turn switch (A) clockwise.

To decrease the time;

turn switch (A) anti-clockwise.

18. Hold the control cover adjacent to the unit

(Fig. 31) and reconnect the plugs to the control

board as follows:

a) Push the red/black connector on to the pins

marked CON 7 (Fig. 34). Ensure that the wires

correspond with the colours marked on the

board. The unit will not operate if connected in

any other way.

b) The purple/white connector determines the unit

mode and should be placed on to CON 5 as

follows:

Delayed Action - Middle and Top pin (Fig. 32)

Direct Action - Bottom and middle pin (Fig. 33)

Note: In either mode the white wire should be on

the lower pin.

The unit will not operate if the connector is fitted

upside down.

19. Replace the control cover with the two

securing screws ensuring that no wires are

trapped.

20. Reassemble the remainder of the unit in

reverse order ensuring the divider board seals

against the heat exchanger.

21. A bezel is provided to neaten the appearance

of the outside wall around the unit. If required this

should be fixed in place using a suitable

silicone/mastic sealant.

SPEEDS

BLK

RED

L/H

O/H

O/L

BLK

RED

CON 7

CON 5

SPEED

O/H

O/L

BLK

RED

CON 7

CON 5

Switch (A)

Fig. 30

Fig. 31

Fig. 32

Delayed Action

Direct Action

Fig. 33

Fig. 34

Control Cover

Purple

White

PIR Sensor

CON 5

Purple

White

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