Vent-Axia MVDC-MS Assembly instructions

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH THE ILLUSTRATIONS.

PLEASE SAVE THESE INSTRUCTIONS

ORIGINAL ENGLISH INSTRUCTIONS

Stock Ref. N°

MVDC-MS 437634C

MVDC-MSH 443298B

SMV-H 445655B

SMV-HX 495360

SMV-HX CO² 495361

SMV PLUS-H 407849A

SMV PLUS-HX 495362

SMV PLUS-HX CO² 495363

IPX2

220-240V~50Hz

Lo-Carbon

MVDC & SENTINEL

MULTIVENT

RANGE

VENTILATION SYSTEMS

Installation and Wiring Instructions

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.



Subject to direct water spray from hoses.



Ambient temperatures higher than 40°C

and lower than -20°C.



Possible obstructions that may hinder

access to or removal of the unit.



All wiring must be in accordance with the current IEE wiring regulations BS7671, or appropriate standards

of your country. Installation should be inspected and tested by a suitably qualified person after completion.



Ensure the mains supply (voltage, frequency and phase) complies with the rating label.



The unit should be provided with a local double pole fused spur fitted with a 3A fuse having a contact

separation of at least 3mm.



This appliance incorporates an earth connection for functional purposes only



Precautions must be taken to avoid the back-flow of gases into the building from the open flue of gas or

other fuel-burning appliances.



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.



Young children should be supervised to ensure that they do not play with the appliance.



Cleaning and user maintenance shall not be made by children



The installer is responsible for the installation and electrical connection of the unit on site. It is the

responsibility of the installer to ensure that the equipment is safely and securely installed and left only

when mechanically and electrically safe.



All regulations and requirements must be strictly followed to prevent hazards to life and property, both

during and after installation, and during any subsequent servicing and maintenance.



Certain applications may require the installation of sound attenuation to achieve the sound levels required.



The unit must not be connected directly to a tumble drier.



The exhaust grille should be located at least 600mm away from any flue outlet.



This product and associated duct installation should be carried out in accordance with the Domestic

Ventilation Compliance Guide.



This product contains FCC ID: S9NSPBTLERF



Bluetooth LE: -12dBm EIRP (63μW), nominal 2450MHz.



Bluetooth v4.1 compliant



The module has obtained the RED certificate: No. 0051-RED-0011 REV. 0



Zirconia Wireless: -14dBm EIRP nominal 868MHz.



Vent-Axia hereby assure that this type of Bluetooth radio and 868MHz radio

equipment complies with RED Directive 2014/53 / EU

The full text of the EU Declaration of Conformity can be found at the following URL:

https://www.vent-axia.com/range/centralised-mechanical-extract-ventilation-mev

INTRODUCTORY NOTES

The MVDC & Sentinel Multivent units are designed for simultaneous extract ventilation of multiple areas

such as bathrooms, kitchens and toilets. The units use a highly efficient backward curved centrifugal motor

impeller set and are designed for continuous 24-hour use.

Depending on the model, they feature either 3 or4 settable speeds and can be configured to change speed

based on a wide range of sensor or control inputs as depicted below

Model

Speed

Max airflow

(m3/hr @0 Pa)

Switched Live

Input (LS)

Analogue

Input 0-10V

Digital

Input

Humidity

Sensor

CO2

Sensor

Wireless

Receiver

MVDC-MS

430

Yes

MVDC-MS H

430

Yes

SMV H

463

Yes

SMV HX

463

Yes

SMV HX Co2

463

Yes

SMV Plus H

573

Yes

SMV Plus HX

573

Yes

SMV Plus HX Co2

573

Yes

The units can be precisely programmed to determine how they respond to changes in sensor values or the

status of the various signal inputs. The units will run at a Normal flowrate until a sensor or input change

causes it to change speed. In the case of the Switched Live and Digital inputs the units will perform a step

change in speed to the appropriate new level. In the case of the Analogue inputs, Humidity Sensor and

CO2 sensor the unit can be programmed to give a proportional response to the change in conditions.

INSTALLATION

Position the unit, taking into consideration the position of the rooms to be ventilated, the exhaust position

and the electrical services. Ensure there is adequate access for installation and maintenance.

If the unit is sited in the heated void of the dwelling a condensate drain should not be necessary.

When sited in a cold loft, consideration should be given to fitment of a condensate drain. Alternatively the

unit and ducting can be externally insulated to minimize condensation within the units housing.

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

and noise of the fan, follow these guidelines:

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

1.2. If you need to use flexible ducting, make sure that it is fully extended and not crushed,

sagging or torn.

1.3. Try to minimize the use of diffusers/valves by having similar length duct runs to the inlets.

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

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

Securely mount the unit through the mounting holes on the casing using appropriate fixings for the

mounting substrate. Anti-vibration mounts; acoustic mat or rubber bushes can also be used.

Fixings (not supplied) to be capable of securing 4 x the weight of the unit. Unit weight: 4.1kg

To maintain the IPx2 rating of the unit, the unit must not be mounted with the cover removal slots

facing upwards, or at an angle where they are visible from above.

All other orientations are acceptable.

See the dimensional details below for the mounting hole positions.

-Spigot diameters are 125mm

Cover removal slots.

i. Base mounted Installation with ducting radiating out horizontally.

ii. 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.

iii. Ceiling mounted Installation with ducting radiating out horizontally.

WIRING

WARNING:

THE UNIT AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED

FROM THE POWER SUPPLY DURING THE INSTALLATION / OR

MAINTENANCE. THIS UNIT MUST BE EARTHED.

1. To remove the cover, use a coin or similar; depress the retaining tabs via the slots in the side of

the unit. There is some kind of weird off-set on this bullet point?

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

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

3. Two mains voltage Live Switched (LS1 and LS2) connections are provided, and can be used to

trigger a change in speed. Common inputs would be from a bathroom lighting circuit. When

commissioning the unit, a delay on timer and an overrun timer can be selected and adjusted in the

software using the buttons and screen. See Commissioning section on page 7 of this document for

details.

4. The switched live output (230Vac) from any other switch or controller, (such as a simple latching pull

cord or push button switch, humidistat or PIR detector) can be connected to the LS terminal instead

of connecting to a lighting circuit.

5. Important: Use 4-core, low voltage, twisted pair, telecoms type cable for accessories (Vent-Axia part

number 459931). Accessories are connected via the IO (Input Output) PCB; see the Low Voltage

Connections diagram. Use the cable clamp and grommet provided.

6. There are no delay on or overrun timers with the volt-free connection as the controller should

determine when the fan is running at Boost or Normal speeds. Use the LS connection described

above if you want a timer.

7. If a humidity sensor is fitted, the unit uses Ambient Response technology to adjust the fan speed

proportionally depending on the temperature and relative humidity levels in the extracted air. The

unit does not just look for relative humidity levels above a set point, which can be unreliable in

products that extract from multiple rooms, but it also looks for rapid increase in relative humidity

typically generated by such activities as showering or cooking. The sensor control also avoids

nuisance tripping at night time when temperatures drop and relative humidity naturally rises.

CONNECTION DIAGRAM

Main power

connections

Main power

connections

MVDC-MS & MVDC-MSH:

SMV & SMV PLUS:

Low voltage

connections

Low voltage

connections

A: Main power connections

The LS1, LS2 and NS terminals are

electrically isolated. If the LS connections

are used, a connection must be made

with the NS terminal. This can be via a

jumper or dedicated neutral connection.

This appliance incorporates an earth connection for functional purposes only.

B: Low voltage connections

For best performance use 4-core,

low voltage, twisted pair, telecoms type

cable for accessories

(available from Vent-Axia part number 459931).

Position

Label

Description

Action

RS485

5V Output, Max 250mA

RS485 communication to wired

accessories.

Data connection is only available for SMV/SMV Plus units.

The 5V and Ground connections are available on all units.

A+

Data

B-

Data

GND

Ground

D IN 2

COM

Digital input common

Go to Boost speed (Min.1V, max. 6V).

The 5V output from the RS485 connection can be used as

a power supply

Digital input 2

D IN 1

COM

Digital input common

Go to Low speed (Min.1V, max. 6V).

The 5V output from the RS485 connection can be used as

a power supply

Digital input 1

D OUT

COM

Digital output common

Unpowered Boost indicator Switch

(switching 6V 50mA max)

Digital output 2

D OUT

COM

Digital output common

Unpowered LED fault indicator switch

(switching 6V 50mA max)

Digital output 1

AN 2

Analog input 2

0-10V analogue input.

Two user settable voltage thresholds with two user settable

actions. The unit will run at Normal when supplied voltage is

between the two thresholds.

GND

Ground

AN 1

Analog input 1

GND

Ground

Connection

Description

Live (220-240Vac)

Neutral

Functional Earth

LS1

Live Switched 1, (220-240Vac), isolated

LS2

Live Switched 2 (220-240Vac), isolated

Neutral Switched, isolated

COMMISSIONING

Advanced feature descriptions

If compatible, the unit can be controlled via the Bluetooth linked App. This is only available on Xunits.

Comfort mode

If Comfort mode is enabled the unit will behave as follows to all LS inputs:

Trigger

Action

LS input active less than 5 minutes

No action

LS input active more than 5 minutes but less

than 20 minutes

Once LS input is removed, fan will run at user

selected speed for the length of time LS was

present plus the set over-run time (if over run is

enabled).

LS input active more the 20 minutes

Unit will Boost after 20mins.

Once LS input is removed, fan will run at user

selected speed for 20 minutes plus the set over-

run time (if over run is enabled).

The above applies to all LS inputs. The times are not adjustable by the user.

Humidity –Rapid rise

Rapid Rise humidity response functions to detect rapid rises in humidity when the ambient %RH is under the threshold

setting. If a rapid rise is detected the fan will boost until the humidity lowers again.

Humidity –Ambient response

When ambient response is enabled the threshold set point is modified based on the ambient temperature. This helps

to prevent nuisance boosting of the unit as temperatures changes during the day.

Analogue inputs

Both analogue inputs have adjustable low and high trigger voltages within the 0-10V range.

The response to being above or below either of the threshold voltages is user settable.

The display doesn’t show a decimal point, for example at threshold voltage of 5.2V, is displayed as “52” on

the unit.

Unit adjustment

1. Commissioning and configuration on all products is supported by the 3 digit user interface and

associated push buttons.

2. When powered on, the unit will display the firmware revision number, after a few seconds the unit

will display the first option in the menu structure (see below).

3. Changes to the settings can be made

via the +and –buttons, the Menu button will

accept changes and move onto the next menu option.

4. When setting the speeds, there is an internal logic: low<Normal<Boost<Purge.

I.e., Boost is always higher than Normal.

5. The actions for each of the Live Switched (LS), inputs are selectable. The setting for delays and

over run timers are applicable to all inputs.

User Configurable Parameters

Display

text

Function

Selections

Default

Lxx

Low speed

1 to 97% motor speed

10%

nxx

Normal speed

2 to 98% motor speed

35%

bxx

Boost speed

3 to 99% motor speed

70%

Pxx

Purge Speed

4 to 100% motor speed

100%

LS1

Live switch 1

Low, Boost or Purge speed

Low

LS2

Live switch 2

Low, Boost or Purge speed

Boost

LS3

Live switch 1&2

Low, Boost or Purge speed

Purge

c-n

Comfort mode

Comfort mode - yes or no

d-n

Delay On

Delay on - yes or no

dxx

Delay On time

Delay to boost duration 1 to 60 minutes

10m

o-n

Overrun

Overrun - yes or no

oxx

Overrun time

Overrun duration 1 to 60 minutes

10m

r-n

Humidity –Rapid Rise

Rapid rise - yes or no

Yes

A-n

Humidity –Ambient Response

Ambient response - yes or no

hxx

Humidity threshold

Ambient response threshold 40 to 80% RH

70%

C2b

CO2 threshold boost

Boost threshold 1000 –1500 PPM

in increments of 100

1000

C2P

CO2 threshold purge

Purge threshold 1400 –1800 PPM

in increments of 100

1500

A1LA

Analogue 1 - low action

Low, Normal, Boost or Purge speed

Low

A1HA

Analogue 1 - high action

Low, Normal, Boost or Purge speed

Purge

A1tL

Analogue 1 - low threshold

Analogue Input Threshold Low 1 - 99

A1tH

Analogue 1 - high threshold

Analogue Input Threshold High 1 - 99

A2LA

Analogue 2 - low action

Low, Normal, Boost or Purge speeds

Low

A2HA

Analogue 2 - high action

Low, Normal, Boost or Purge speeds

Purge

A2tL

Analogue 2 - low threshold

Analogue Input Threshold Low 1 - 99

A2tH

Analogue 2 - high threshold

Analogue Input Threshold High 1 - 99

Digital input 1 Action

Low, Boost or Purge speeds

Low

Digital input 2 Action

Low, Boost or Purge speeds

Purge

unl

Unlock code

Turn on/off the menu lock

- - -

Display Pin

3 characters A to 9

LoC

dtxx

Display time

Adjust how long the display is illuminated

30 s

rot

Rotate display

Invert the display

rot

Humidity

Show the current internal humidity

temperature

Show the current internal temperature

°C

CO2

Show the current CO2 level

PPM

end

End of menu (loop to start)

If the unit being commissioned is not fitted with the relevant hardware, the associated menu options will not

be available.

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