Vent-Axia HR25 Solo User manual

Models:-

HR25 Solo

HR25 Solo L

HR25 Solo H

HR25 Solo LH

Installation and User Instructions

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PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS. PLEASE SAVE THESE INSTRUCTION

HR25 Solo

“Through the Wall” Heat Recovery Ventilators

Contents

Section Page

1.0 Introduction 3

2.0 Site Requirements 4

3.0 Installation 5

4.0 Maintenance 11

5.0 Spares list 12

Fig.1

1.0 Introduction

1.1 Description

1. The Vent-Axia HR25 Solo 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 Solo

The HR25 Solo is fitted with a pull cord switch

which provides a twin speed control function.

HR25 Solo H

The HR25 Solo H is fitted with an adjustable

humidity sensor which automatically switches

between low and high speeds depending on the

relative humidity in the room of installation.

HR25 Solo L & HR25 Solo LH

These are extended versions of the above

models. They are designed for installations

where the wall thickness is between 311mm

and 425mm.

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 enclosure supplied,

which is intended for permanent connection to

the mains electrical supply. The unit and the

power supply enclosure are intended for fixed

wiring installation.

4. The power supply enclosure 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.

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

the switched fused spur supplied as part of the

power supply enclosure.

6. The spur supplied is designed with 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. Screwdriver access must be provided to the

left of the power supply enclosure for the

removal of the cover screw (Fig. 2).

10. Do not site the appliance in the vicinity of

excessive levels of airborne oil or grease. or

directly over a cooker.

11. 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.

12. The unit must not be installed at a level

below 500mm from the floor.

13. 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.

14. 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.

15. 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.

16. Ensure the mains electrical supply is

switched off before commencing installation or

maintenance.

2.0 Site Requirements

50mm minimum

125mm minimum

300mm minimum 300mm minimum

Ceiling

Fig.4

Fig.5

3.0 Installation

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. Mark the position of the mounting hole.

3. 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).

4. Remove the unit from the carton

5 Release cover using the two release clips

(Fig 5) Unplug the sensor cable from the PCB if

present

6 Using the mounting plate on the product.

Mark the position of the four mounting holes,

and then put product to one side. Drill and plug

the holes

7. 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.

8. Ensure the cable to the unit extends

sufficiently from the mounting hole to enable

the required connections within the control

enclosure.

Outside Inside

Fig.6

Isolator unit section

Fig.7

3.0 Installation

3.2 Installing the Power Supply Unit

1. Remove the power supply unit assembly

from the carton.

2. Remove the power supply unit packaging.

3. Remove isolator and power supply covers

(Fig. 6).

4. The mains input to the power supply unit

must be routed via the rear or side of the

enclosure behind the switched connection unit.

NOTE: Mains wiring must be kept separate

from the S.M.P.S. side of the enclosure.

The mains connection is to the input side of the

isolator unit.

5. Remove one of the cable knockouts and

feed the 3-core cable through the power supply

enclosure (Fig. 7).

6. Mark the fixing hole positions then Drill and

plug the wall to secure the power supply

enclosure using the fixing screws provided.

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

white and black low voltage supply via the

terminal block. Route it via one of the exit holes

(Fig. 7)

8. Ensure that the mains wires from the

S.M.P.S. run through the slot in the divider wall

(Fig. 6).

9. Fit the power supply cover using the small

self tapping screw through the side of the

power supply enclosure (Fig. 6).

10. Make the feed connections from the mains

supply to the rear of the isolator unit. Connect

live to L IN terminal, neutral to the N IN terminal

and earth to the brass earthing terminal.

11. Fit the isolator unit to the power supply

enclosure using the screws provided (Fig. 5).

Motor wires

Wiring label

Low voltage

terminal block

Pull switch

Black motor lead

termination

Red motor lead

termination

Fig.10

Fig.11

Fig.12

3.0 Installation

3.3 Installing the HR25 Solo

1. Remove the bezel and fixing pack from

the carton.

2. 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. 10).

4. Secure the rubber seal to the unit using the

adhesive provided.

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

not push it fully in.

6. Route the low voltage cable from the power

supply enclosure to the unit.

7. Pass the low voltage cable through the cable

entry grommet at the top of the unit

(Fig. 12).

8. Secure the unit to the wall using the four

fixing screws provided.

9. Strip the low voltage cable sheath back

40mm from the end and separate the three

individual wires stripped to 6mm.

10. Connect the wires to the terminal block.

Connect red to red, white to white and black to

black (Fig. 11 and 12).

11. Reassemble in reverse order

13. 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.

25mm

Outside wall

Rubber

seal

Release clips

Outer cover

Heat exchanger

External bezel

Cable entry

Fig.13

Fig.14

Fig.15

3.0 Installation

3.4 Installing the HR25H Solo

1. Remove the bezel and fixing pack from

the carton.

2. 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. 13).

4. Secure the rubber seal to the unit using the

adhesive provided.

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

not push it fully in.

6. Route the low voltage cable from the power

supply enclosure to the unit.

7. Pass the low voltage cable through the cable

entry grommet at the top of the unit (Fig. 15).

8. Secure the unit to the wall using the four

fixing screws provided.

9. Strip the low voltage cable sheath back

40mm from the end and separate the three

individual wires striped by 6mm.

10. Connect the wires to the terminal block.

Connect red to red, white to white and black to

black (Fig. 14).

11. The HR25H Solo unit is factory set to

switch between low and high speed.

Low / High speed (continuously running)

12. 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.

13. To adjust the humidity level, rotate switch

(A) as follows (Fig. 14) :-

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%).

14. Reassemble in reverse order ensuring the

humidity sensor cable is plugged into CON 4.

15. 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.

Release clips

Outer cover

Sensor

PCB

External bezel

Connection cable

Heat exchanger

25mm

Outside wall

Rubber

seal

Outer

cover Sensor Cable entry

grommet

BLK

RED

BLK

RED

O/L

O/H

L/H

CON 4

O/L

O/H

L/H

SPEEDS

Position jumpers

for low/high speed setting

Switch (A)

Terminal Block

Heat exchanger

Motor housing

Chassis

Inner tube

Outer tube

Rubber seal

Plastic ring

Motor wires

Wiring label

Low voltage

terminal block

Pull switch

Black motor lead

termination

Red motor lead

termination

Fig.21

Fig.22

Fig.23

Fig.24

3.0 Installation

3.6 Installing the HR25L Solo & LH

Solo

For wall thicknesses between

311mm & 425mm

1. Disconnect the red and black motor wires

(Fig. 21).

2. Carefully withdraw the heat exchanger from

the unit (Fig. 22).

3. Slide the inner tube out of the unit by

pushing the motor housing (Fig. 23).

4. Remove the plastic ring and rubber seal from

the outer tube (Fig. 24).

Heat exchanger

Recess

Divider slot

Wiring tunnel

Fig.25

Fig.26

Fig.27

Fig.28

Fig.29

3.0 Installation

3.6 Installing the HR25L Solo & LH

Solo (cont)

5. Measure the wall thickness and add 25mm.

This is dimension “X” (Fig. 25.

6. Mark off dimension “X” on the outer tube,

measuring from the rear of the chassis. Cut off

the excess material (Fig. 26).

7. Remove any burrs from the tube.

8. Measure the waste from the outer tube and

cut the same amount off the base of the divider

board (Fig. 26).

9. Replace the rubber seal 50mm in from the

end of the tube and secure using the adhesive

provided.

10. Refit the plastic ring using the adhesive

provided.

11. Subtract 1.5mm from dimension “X”. This

will be dimension “Y”.

12. Mark off dimension “Y” from the motor

housing end of the inner tube, and scribe a line

around the inner tube. Peel the two motor wires

away from the wiring tunnel beyond the scribed

line to prevent damage. Carefully cut the

excess off the tube (Fig. 27).

13. Remove any burrs from the tube.

14. Reassemble the tubes in reverse order

ensuring that the two motor wires are located

back in the wiring tunnel, and that the tunnel is

aligned with the wiring slot in the chassis

(Fig. 28).

15. Replace the heat exchanger according to

the ‘Inside/Outside’ labels. The recess in the

heat exchanger outer must be aligned with the

wiring tunnel on the inner tube to ensure the

divider slot is vertical (Fig. 28 and 29).

16. Cut the two motor wires to size and

reconnect to their respective terminals (Refer to

the relevant unit instructions - see pages 7-8).

Continue installing the unit from paragraph 7

onwards in the relevant unit instructions - see

pages 7-8.

(X)

Waste

Outer tube

Chassis

Divider

board

Joint clip

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