Vent-Axia HR4 Guide rapide

HR4

Semi-Remote Wall Mounted Heat Recovery Unit

With Spigot Connections & Integral Fans

Installation and

Servicing Instructions

Please leave these instructions with the user

1.0Introduction 4

2.0Site Requirements 5

3.0Installation 6

4.0Electrical 8

5.0Maintenance & Accessories 9

6.0Notes 10

Section Page

Contents

1.0 Introduction

1.1 Description

1. The Vent-Axia HR4 unit is self contained, with

integral extract and supply fans to provide

balanced ventilation and heat recovery via

supply diffusers and extraction grilles.

The unit is designed for installation in external

walls and should be fitted to provide a 3° slope

to outside to provide condensate drainage.

2. Spigots are designed to take standard

300mm diameter flexible ducting. Foam collar

adaptors are available to convert these spigots

to 315mm diameter compatibility.

3. The unit is fully speed controllable with the

facility to reverse the supply air fan and provide

‘double extraction’ for periods when heat loss is

desirable.

4. ON/OFF speed selection and fan reversal

can be automatically controlled by simple

sensors - see controller data sheet VCON33.

5. At 40 pa external static pressure the HR4

unit will deliver approximately 500m3/hr supply

and extraction, or 750m3/hr extract only.

1.2 Technical Data

Electrical

Supply Fan - 60 Watts

Extract Fan - 150 Watts

Wiring - 0.75mm2, 4 core and earth

(N.B. Wiring must be approved to BASEC

or HAR)

Fixing

Hole Opening - 610mm x 380mm

Unit Weight - 17kg

150

100

0 200 400 600 800 1000

Volume m /hr

Static Pressure (Pa)

Performance Curve

A - Mean heat recovery performance

B - Double extract performance

C - Supply

D - Extract

300

200

100

2000 400

Volume m /hr

600 800 1000

Pressure Drop (Pa)

Pressure Drop

Fig. 1

Fig. 2

Fig. 3

2.1 Information

1. The unit must be sited and connected in

accordance with current I.E.E. Wiring

Regulations (UK), and local building regulations.

Outside the UK, the units must be installed in

accordance with the appropriate standards

applicable to your country.

2. The unit is suitable for use at a maximum

ambient temperature of 45°C.

3. The HR4 unit should be placed as high as

possible, in an exterior wall to a minimum

distance of 125mm (5”) from the ceiling.

4. The incoming air supply should not be

directed at a wall or solid surface and areas

adjacent to doors should be avoided if possible.

5. Care should be taken to avoid structural

elements such as joists or beams.

6. Site away from direct sources of heat in

excess of 40°C, and direct water spray.

7. Precautions must be taken to avoid the back

flow of gases into the room from the open flue

of Gas or other Open Flue appliances.

8. The installer must ensure that the air intake is

located at a minimum distance of 500mm away

from any flue outlet.

9. If the unit is installed within a room containing

a fuel burning appliance, the installer must

ensure that the air replacement is adequate for

both the unit and the fuel burning appliance.

10. Wiring must be via a fused switched spur

with a 3mm contact separation in each pole.

11. Before deciding on the final position of the

unit, check that there are no buried cables,

pipes or obstructions on the outside wall.

2.0 Site Requirements

3°

Fig. 4

Fig. 5

Fig. 7

Fig. 6

600mm

Supply

External Grille

Extract

SupplyExtract

Heat Exchanger

Cover Bolts

370mm

600mm

570mm

480mm

340mm

750mm

380mm

11”Cavity Wall

3°Angle for

condensate drainage

3.0 Installation

3.1 Initial Preparation

1. Working from the inside, mark out the

position of the hole to be cut. This should be

610mm (24”) x 380mm (15”) (Fig. 8).

2. Mark the centre of the cut-out by drawing

diagonal lines from the four corners.

3. Drill horizontally through the wall at the

marked centre point, using an appropriate long

reach drill.

4. Estimating the wall thickness, move to the

outside and mark the position of the hole to be

cut in the outer wall, using the centre hole as a

guide. Again, this should be 610mm (24”) x

380mm (15”) (Fig. 8). However, to allow for

condensate drainage, the hole must be marked

between 12mm-30mm (0.5”-1.25”) LOWER

than the inner hole (Fig. 9). This will produce a

nominal 3°slope towards the outside

(assumption of installation into wall thickness

dimension between 230mm - 610mm (9”-24”)).

5. Using the lines as a basis, carefully cut the

holes in the inner and outer walls to form a

suitable aperture to receive the unit.

NOTE: Bricks will cut more easily and

accurately if a series of holes are drilled

close together along the marked lines.

6. Choose a suitable site for the controller or

switch box, and run a suitable length of cable (5

core, 0.75mm2) to the unit for wiring through the

left hand side.

3°

Fig. 9

Fig. 8

12 to 30mm

Inside Outside

610mm (24”)

380mm

(15”)

3.0 Installation

3.2 Installing the Appliance

1. Carefully line up the unit into the wall

aperture, ensuring that the wire is fed into the

unit through the grommet as shown.

2. Position the unit in the wall aperture,

ensuring that there is a 3°slope to the outside.

CAUTION: Care should be taken not to

distort either inner or outer cases when

fixing and making good.

3. Secure into position using appropriate plugs

and screws, and make good around the casing.

4. Connect the wire into the controller box within

the unit, ensuring that the cable restraint

prevents the cable from becoming strained,

twisted or forced.

5. Ensure that the product is wired in

accordance with the details attached.

WARNING: Ensure that the unit is

properly earthed.

6. Connect up the opposite end of the wire into

respective controller, ensuring that the cable is

routed between the unit and the controller box

appropriately, and that the wire is not strained,

twisted or forced.

7. Make good the cable routing.

8. Connect up the mains supply via an

appropriate fused switched spur, ensuring that

a 5A fuse is correctly fitted.

3°

Fig. 10

Lay-in Eggrate

Grille

External

Wall

3°Slope

Suspended Ceiling

Typical Installation

Lay-in 4 Way

Diffuser

4.0 Electrical

Link

HR4 Terminal

Block

Direct to mains -

Full speed only -

Heat recovery mode

Fused Isolation

Switch

Neutral

Live

Earth

NOTE: The sensor arrangement

can be used with single

or dual unit control

Humidity Sensor HS6 Wiring Control of Boost Speed Switching

Link

VCON33

Terminals

HS6

Terminals

HR4 Terminal

Block

Direct to mains -

Full speed only -

Heat recovery mode and

switching to extract only

Fused Isolation

Switch

Live

Neutral

Earth

Switch for

Heat Recovery mode

or Extract Only

NOTE: Remove link between terminals 10 & 11

Automatic 'Boost Speed' Wiring

N/O

N/C

Link

Auto

Common

Switched

VCON33

Terminals

Changeover

Sensor

VCON 33S

Terminal Block

HR4 Unit

Terminal Block

Single HR4 unit wiring

VCON 33S speed controller

Capacitor 10uF

Capacitor 7uF

5A Fuse

Link

Mains

Supply

230V 50Hz

1.0-1.5mm Cable

HR4 Terminal

Block

Variable speed

controller VCON5 -

Heat Recovery mode and

switching to Extract Only L

Fused Isolation

Switch

VCON5

Terminal

Live

Neutral

Earth

Switch for

Heat Recovery mode

or Extract Only

NOTE: Remove link between terminals 13 & 14

Automatic 'Extract Only' Wiring

N/O

N/C

Link

Auto Boost

Common

Switched

VCON33

Terminals

Changeover

Sensor

Optional External Sensor Wiring

Sensors must be ‘make and break’(changeover) type,

mains voltage minimum 2.5A inductive load.

Automatic Extract Only Control

By removing the link between terminals 13 and 14, a

changeover sensor can be connected to terminals 12, 13

and 14 to provide automatic supply fan reversal for

extraction only mode of the HRV unit. Example; a

thermoswitch can be used to provide extract only and

therefore heat loss at a preset temperature level.

Automatic Boost Speed Switching

By removing the link between terminals 10 and 11, a

changeover sensor can be connected to terminals 9, 10

and 11 to provide automatic switching to boost speeds as

required.

Example; A humidistat can be used to switch the unit to

boost when high humidity levels are reached, as would be

experienced from activity in a swimming pool. The unit

would automatically return to normal speed 1 or 2 once the

humidity levels have been reduced.

For dual unit control using VCON 33S see Controller Data Sheet

4.1 Wiring Options

5.0 Maintenance & Accessories

5.1 Cleaning the Unit

1. The heat exchanger will require occasional

cleaning to remove build up of deposits.

2. The cassette is easily extracted by

unscrewing the 4 x M6 cover bolts (Fig. 11).

3. Debris can be removed and cleaned by using

a vacuum cleaner, or by washing in luke warm

soapy water.

4. In heavily polluted and smoky environments,

it is recommended that the heat exchanger unit

is examined for cleaning puposes every 3

months.

5. Spare cassettes are available to enable

immediate changeover of soiled units, which

can be cleaned for later use.

5.2 Accessories

1. Speed Controller VCON 33S

Speed controller for surface mounting, 3 speed

and fan reversal.

2. Speed Controller VCON 5

ON/OFF variable speed controller mounted on

a standard one gang switch plate and supplied

with a plastic surface mounting back box.

Fig. 11

Cover Bolts

Heat Exchanger

6.0 Notes

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