Vent-Axia MVDC-MS Assembly instructions

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH THE ILLUSTRATIONS.

PLEASE SAVE THESE INSTRUCTIONS

Lo-Carbon

MULTIVENT

MVDC-MS & MVDC-MS H

VENTILATION SYSTEMS

Stock Ref. N°

MVDC-MS 437634A

MVDC-MS H 443298

Installation and Wiring Instructions

IP22

220-240V~50Hz

Installation and Wiring Instructions for the Multivent Multi-Speed Extract Fans.

IMPORTANT:

READ THESE INSTRUCTIONS BEFORE COMMENCING THE INSTALLATION

DO NOT install this product in areas where the following may be present or occur:

•Excessive oil or a grease laden atmosphere.

•Corrosive or flammable gases, liquids or vapours.

•Ambient exhaust air temperatures higher than 40°C or less than –5°C.

•Relative humidity above 90%

•Possible obstructions which would hinder the access or removal of the Unit.

•Sudden ductwork bends or transformations close to the Unit.

SAFETY AND GUIDANCE NOTES

1. DO NOT install this product in areas where the following may be present or occur:

1.1. Excessive oil or a grease laden atmosphere.

1.2. Corrosive or flammable gases, liquids or vapours.

1.3. Ambient temperatures higher than 40°C or less than -5°C.

1.4. Possible obstructions which would hinder access or removal of the Fan.

2. All wiring to be in accordance with the current I.E.E. Regulations, or the appropriate standards of your country and

MUST be installed by a suitably qualified person.

3. The fan should be provided with a 3A fused, isolator switch capable of disconnecting all poles, having a contact

separation of at least 3mm.

4. Ensure that the mains supply (voltage, frequency, and phase) complies with the fan’s rating label.

6. When the fan extracts air from a room containing an open flue of a gas or fuel burning appliance, precautions

must be taken to avoid the back-flow of gases into the room.

7. The fan should not be used where it is liable to be subjected to direct water spray.

8. The fan should be mounted at the highest point in the system to protect it from condensation build up.

9. This fan should be vented to the outdoors.

10. This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental

capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning

use of the appliance by a person responsible for their safety.

11. Children should be supervised to ensure that they do not play with the appliance.

12. PLEASE NOTE: Some older fluorescent and low energy lighting products can interfere with other

electronic/timing circuits. For reliable operation of timers use post 2000 low energy bulbs or tungsten filament bulbs

in the room lighting circuit.

TYPICAL INSTALLATION

A. INTRODUCTORY NOTES

The MVDC-MS is an M.E.V (Mechanical Extract Ventilation) unit designed for simultaneous extract ventilation of

multiple areas such as bathrooms, kitchens and toilets. The MVDC-MS employs a highly efficient backward curved

centrifugal motor impeller set and is designed for continuous 24-hour use.

The MVDC-MS has 3 speed settings (Normal, Boost and Purge). Normal and Boost speeds are adjustable, whilst

Purge is maximum speed. To achieve these 3 speed selections there are 2 LS inputs.

The product will run at Normal speed unless the input from an accessory calls for a change to Boost or Purge speed.

For the MVDC-MS (437634A) the Boost setting is activated using a switched live supply (LS input). The other

remaining LS input can be used to switch the unit to Purge speed.

For the MVDC-MS H (443298) the Boost setting is activated by the internal humidity sensor.

The internal humidity sensor uses one of the two available LS inputs, the other remaining LS input can be used to

switch the unit to Purge speed.

The MVDC-MS H has the option to switch from Normal to Boost speed (in effect over-riding the internal humidity

sensor), this can be achieved by connecting an isolated switched live connection to the LS connection on the power

supply terminal block. This must be isolated by using, for example an Isolator Relay Control, Vent-Axia part number

442030, or similar.

B. SITING

The MVDC-MS can be mounted in 3 orientations for convenient installation in roof voids with a height ≥250mm.

a). Base mounted Installation with ducting radiating out horizontally.

b). Vertically mounted Installation with the exhaust spigot at top. The electrical connections must come out of the

bottom of the unit in order to maintain the water ingress protection.

c). Ceiling mounted Installation.

See the dimensional details below for the mounting hole positions.

-Spigot diameters are 125mm

C. INSTALLATION

To reduce the system resistance in your duct system, and therefore lower the speed, power consumption and noise

of the fan, please follow these instructions:

•Keep the length of duct runs to a minimum, particularly the exhaust duct run.

•Use larger diameter ducting rather than smaller.

•If you need to use flexible ducting, make sure that it is fully extended and not crushed, sagging or torn.

•Try to minimise the use of dampers by having similar length duct runs to the inlets.

•The bend radius, (measured to the inside of the bend), should be at least 1x the duct diameter. The larger,

the better.

•Avoid having any bends, filters or other obstructions within 250mm of the fan inlets and outlet.

1. Position the MULTIVENT, taking into consideration the position of the rooms to be ventilated, the exhaust

position, the drainage position and the electrical services. Ensure there is adequate access for installation

and maintenance. Securely mount the MULTIVENT through the mounting brackets on the casing using the

appropriate anti-vibration mounts, screws, washers, rubber bushes etc.

2. Ducting passing through an unheated space should be insulated.

The MVDC-MS can be connected to either Ø125mm or Ø100mm ducting. Remove the blanking caps to

connect Ø125mm ducting. To connect Ø100mm ducting, peel out the centre of the cap with a screwdriver as

indicated on the cap and leave the cap surround in position.

Please note that the exhaust duct must always be Ø125mm ducting.

D. WIRING

WARNING: THE MULTIVENT AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED

FROM THE POWER SUPPLY DURING THE INSTALLATION / OR MAINTENANCE.

THE MULTIVENT UNIT MUST BE EARTHED.

IMPORTANT:- Please ensure that the supply cable passes through the ferrite

Bead supplied, Use the cable tie supplied to retain ferrite in position.

A. MVDC-MS (437634A):

1. Remove the cover by undoing the four screws and lifting it away.

2. With the power off, connect a suitable mains power cable from a switched, fused spur to the power supply PCB.

Use the cable clamps and clip provided to secure the lead.

3. Ensure all connections are correct and that all terminal screws and cable clamps are securely fastened.

4. To enable the fan to switch to boost or purge speed when a light is turned on, connect the switched live

connection from the lighting circuit to one of the LS connections on the mother board.

5. The switched live output (230V) from any other switch or controller (such as a pullcord or push button switch,

humidistat or PIR detector) can be connected to the LS terminal instead of connecting to a lighting circuit.

6. Following these set-up instructions, switch the mains supply on and check the system is operating correctly.

MVDC-MS (437634A) CONNECTION DIAGRAM

MVDC-MS (437634A) WIRING DIAGRAM

Fuse

LNE

1 Phase supply

(220-240V 50 Hz)

Switched

fused spur

MVDC-MS

MOTOR DRIVE PCB

TERMINAL BLOCK

E N L

L1 L2

Switch

(45 52 13)

(Not supplied)

LS NLS N

MVDC-MS

MOTHERBOARD

TERMINAL BLOCK

PURGE BOOST

SELECT

BOOST OR PURGE

MVDC-MS UNIT

B. MVDC-MS H (443298):

1. Remove the cover by undoing the four screws and lifting it away.

2. With the power off and using a suitable mains power cable from a switched, fused spur connect the Live and

Neutral to the power supply Terminal block and connect the Earth to the power supply PCB.

Use the cable clamps provided to secure the lead.

3. Ensure all connections have are correct and that all terminal screws and cable clamps are securely fastened.

4. To enable the fan to switch to purge speed (maximum speed) connect the switched live connection to the

‘Purge’ LS connection on the mother board.

5. The output (230V) from the internal humidistat PCB is connected to the ‘Boost’ LS terminal.

6. Upon installation it is possible that the humidity controller will make the fan run continuously until it has

acclimatised to the environment. As part of the installation process it is important to set/adjust the humidity

sensitivity to the desired position. The controller is already factory set to switch on at about 70% R.H.

7. To Lower the set-point use the enclosed adjuster to turn the adjuster ANTICLOCKWISE. This makes the

controller More sensitive.

To Raise the set-point use the enclosed adjuster to turn the adjuster CLOCKWISE. This makes the controller

Less sensitive.

8. Following these set-up instructions, switch the mains supply on and check the system is operating correctly.

To allow the MVDC-MS H to switch from Normal to Boost speed using the LS Input:

1. Connect an isolated switched live connection to the LS connection on the power supply terminal block.

WARNING: THE SWITCHED LIVE CONNECTION TO THE LS CONNECTION MUST BE

ISOLATED, FOR EXAMPLE USING AN ISOLATOR RELAY CONTROLLER, VENT-AXIA PART

NUMBER 442030 OR SIMILAR.

MVDC-MS H (443298) CONNECTION DIAGRAM

MVDC-MS H (443298) WIRING DIAGRAM

Using an LS Input to switch the MVDC-MS H from Normal to Boost

Fuse

LNE

1 Phase supply

(220-240V 50 Hz)

Switched

fused spur

MVDC-MS H

MOTOR DRIVE PCB

TERMINAL BLOCK

E N L LS NLS N

MVDC-MS H

MOTHERBOARD

TERMINAL BLOCK

PURGE BOOST

SELECT

BOOST OR PURGE

N L LS

MVDC-MS H

HUMIDISTAT

BOARD

MVDC-MS H

UNIT

Fuse

LNE

1 Phase supply

(220-240V 50 Hz)

Switched

fused spur

MVDC-MS H

MOTOR DRIVE PCB

TERMINAL BLOCK

E N L LS NLS N

MVDC-MS H

MOTHERBOARD

TERMINAL BLOCK

PURGE BOOST

SELECT

BOOST OR PURGE

N L LS

MVDC-MS H

HUMIDISTAT

BOARD

MVDC-MS H

UNIT

Supply 220-240V 50Hz

Lighting circuit 1

Light

switch

Speed Selection –

E. Commissioning

The speed and boost settings are fully adjustable via the potentiometers located on the front of the unit.

However, for ease of adjustment during commissioning there are 4 pre-marked settings to assist in speed selection.

As marked on the unit, the left hand potentiometer controls the ‘Normal’ speed, the right hand potentiometer

controls the ‘Boost’ speed.

USE THE BLUE POTENTIOMETER DRIVER SUPPLIED WITH THE UNIT. Turning the potentiometer clockwise

will increase the speed.

If a purge switch is installed this activates the unit at maximum speed.

Once the MVDC-MS is commissioned, apply white label over marked area containing ‘Boost’ and ‘Normal’ holes to

ensure the potentiometers are inaccessible and that the unit returns to an IP22 rated status.

F. SERVICING AND MAINTENANCE.

This product contains a self-cleaning backward curved impeller that requires no servicing.

The fan has sealed for life bearings, which do not require lubrication.

Setting

15%

30%

45%

100%

100

150

200

250

300

350

400

050 100 150 200 250 300 350 400 450 500

Volume (m3/h)

Pressure (Pa)

eed

The Guarantee

Applicable only to products installed and used in the United Kingdom. For details of guarantee outside the United Kingdom contact your local

supplier.

Vent-Axia guarantees its products for two years from date of purchase against faulty material or workmanship. In the event of any part being found

to be defective, the product will be repaired, or at the Company’s option replaced, without charge, provided that the product:-

•Has been installed and used in accordance with the instructions given with each unit.

•Has not been connected to an unsuitable electricity supply. (The correct electricity supply voltage is shown on the product rating label

attached to the unit).

•Has not been subjected to misuse, neglect or damage.

•Has not been modified or repaired by any person not authorised by the company.

IF CLAIMING UNDER TERMS OF GUARANTEE

Please return the complete product, carriage paid to your original supplier or nearest Vent-Axia Centre, by post or personal visit. Please ensure

that it is adequately packed and accompanied by a letter clearly marked “Guarantee Claim” stating the nature of the fault and providing evidence of

date and source of purchase.

The guarantee is offered to you as an extra benefit, and does not effect your legal rights

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