Vent-Axia MultiVent Continuous Extract Ventilation

Specifications

E6337 Compliance: AS/NZS60335-2.80:2016

Typical Extraction Locations - Bathrooms, Toilets, Laundries, Kitchens

The unit uses a highly efficient backward curved centrifugal motor impeller set and is designed for continuous 24-hour use. Four settable speeds can be configured to change these speeds based on an integrated sensor or separate switch inputs (not supplied). The unit will run at a normal flow rate until the humidity sensor or external switch input triggers a speed change. In the case of switched live and digital inputs, the units will perform a step change in speed to the appropriate level. In the case of analog inputs and humidity sensor, the unit can be programmed to give a proportional response to the change in conditions.

The extracted air is replaced through natural airflow through the gaps around doors and windows, trickle inlet slots, or best of all, the Manrose Puro Filtered Passive Vent Kit (DCT4565) with typhoon cowl that has an effective aerodynamic area of 3000mm² without the filter and 1400mm² with the filter fitted.

Puro Filtered Passive Vent Kit DCT4565

Important Safety Information

MULTIVENT CONTINUOUS EXTRACT VENTILATION SYSTEM INSTALLATION AND ELECTRICAL CONNECTION MUST BE CARRIED OUT BY A REGISTERED ELECTRICIAN

CAUTION

• Do not install this product where excessive oil or a grease laden atmosphere is or may be, present.
• Do not install this product where corrosive or flammable gases, liquids or vapours are, or may be, present.
• Do not install this product where it may be subject to direct water spray from hoses.
• Do not install this product where access to, or removal, of the unit may be obstructed.
• Before use, please check that the supply voltage and that of the appliance are the same (see product rating label).
• All wiring and wiring connections must comply with all current national wiring rules and regulations including AS/NZS3000:2017, or latest edition thereof.
• Any changes or modifications made or attempted to this product, without the prior written approval of the manufacturer, will void any and all stated warranties.
• This MultiVent continuous extract ventilation system is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they are capable of, and have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
• Children should be supervised to ensure that they do not play with the MultiVent continuous extract ventilation system.
• In case of damage to the supply cord, switch off the device and do not tamper with it. Damaged supply cords must only be repaired or replaced exclusively by the manufacturer or by an appointed representative. Failure to comply with the above may endanger the safety of people and cause possible damage to the whole system.
• The unit must not be connected directly to a tumble drier.
• Exhaust fans may adversely affect the safe operation of appliances burning gas or other fuels (including those in other rooms) due to back flow of combustion gases. These gases can potentially result in carbon monoxide poisoning. After installation of an exhaust fan such as a partition fan or a duct fan, the operation of open flued gas appliances should be tested by a competent person to ensure that back flow of combustion gases does not occur.
• The exhaust grille should be located at least 600mm away from any flue outlet.

⚠️ BEFORE INSTALLING THE MULTIVENT CONTINUOUS EXTRACT VENTILATION SYSTEM, MAKE SURE YOU HAVE TURNED OFF THE MAIN ELECTRICITY SUPPLY. DO NOT TURN IT BACK ON UNTIL THE MULTIVENT CONTINUOUS EXTRACT VENTILATION SYSTEM IS FULLY INSTALLED AND READY TO USE.

IMPORTANT: ALL ELECTRICAL WORK MUST BE CARRIED OUT BY A REGISTERED ELECTRICIAN IN ACCORDANCE WITH THE LATEST WIRING RULES AS/NZS3000.

• This MultiVent continuous extract ventilation system is hot when in use. To avoid burns, do not let bare skin touch hot surfaces. Keep combustible materials away from the unit and keep them away from the sides and rear.
• Do not use near or in the immediate vicinity of a bath or swimming pool or any wet areas.
• When installing fan through an external wall, an external wall grille must be fitted at all times.
• This appliance incorporates an earth connection for functional purposes only.
• To protect against electric shock, do not immerse cord or plug in water or any other liquids.
• Do not insert or allow foreign objects to enter any ventilation openings, as this may cause an electric shock, fire or damage to the fan.
• Do not put fingers or foreign objects into the grille while in operation.
• Any changes or modifications made or attempted to this product, without the prior written approval of the manufacturer, will void any and all stated warranties.
• To prevent overheating of this fan, keep the air inlets and outlets clean and free of anything that may cause blockage. Check all inlets and outlets from time to time to ensure it is clear of any dirt or dust accumulation. DO NOT COVER.
• Do not use it in areas where gasoline, paint, or flammable liquids are used or stored.
• This product contains recyclable materials. Do not dispose of this product as unsorted council waste. Please contact your local council for the nearest collection point.

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 roof cavity, consideration should be given to fitment of a condensate drain. Alternatively, the unit and ducting can be externally insulated to minimize condensation within the unit's 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:

• Keep the length of duct runs to a minimum, particularly the exhaust duct run.
• When using the flexible ducting in the kit, make sure that it is fully extended and not crushed, sagging, or torn.
• Try to minimize the use of diffusers/valves 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.
• Avoid having any bends, filters, or other obstructions within 250mm of the fan inlets and outlet.

Diagram illustrating ducting principles: shows a preferred flexible ducting route with minimum radius of 1x duct diameter, avoiding bends and restrictions near fan inlets/outlets. Includes notes on duct supports, sleeve, sealant, interior/exterior grilles, and airflow.

Securely mount the unit through the mounting holes on the casing using appropriate fixings (not supplied) for the mounting substrate. Fixings must be capable of securing 4x the weight of the unit. Unit weight: 4.1kg. Anti-vibration mounts, acoustic mats, or rubber bushes can also be used.

Diagram showing mounting example with main power and low voltage connections indicated.

To maintain the IPX2 rating of the unit, the unit must not be mounted with the cover removal slots facing upwards (as indicated by the red arrows), or at an angle where they are visible from above. All other orientations are acceptable.

As per the picture above, try to position the MultiVent fan housing in a location central to all of the rooms that you are planning to extract from. Also, remember that the unit could create noise and should be mounted away from bedrooms. Mount the MultiVent using the 4 mounting points. Bear in mind that the exhaust (main extraction) is using 150mm aluminium foil ducting and a 150mm weatherproof cowl. Each kit contains 3 x 6m lengths of 125mm aluminium foil ducting for the extraction points.

• Cut a 126mm (minimum) hole in the required locations in the kitchen (minimum 2m away from the stove top), bathroom, and toilet.
• Disassemble the 125mm diffusers (DCT0186) and mount the 125mm spigots to the ceiling in each location using the four screws supplied.
• Fit the diffuser escutcheon by pushing it into the spigot.
• Extend the 125mm aluminium foil ducting and slide the spigot collar over the ducting by approximately 150mm.
• Slide the 125mm aluminium foil ducting over the spigot.
• Slide the spigot collar over the ducting, pressing it firmly all the way down the spigot, clamping the aluminium foil ducting in place on the spigot. To prevent the spigot being pushed out, have another person pushing up from below. Complete the other two rooms following the same instructions.

Mount the 125mm duct joiner (DCT0037) to the exhaust port of the MultiVent.

Fit the 150mm to 125mm reducer (DCT3239) to the 125mm duct joiner and tape both joints using the supplied duct tape.

Fit the 150mm aluminium foil ducting (DCT0214) to the 150mm waterproof cowl with mesh (DCT3619) and tape it to the spigot.

From outside of the building, cut a 150mm (minimum) hole in the outside cladding of the home and push the 150mm ducting through the hole.

Fit the waterproof cowl to the building exterior and then, from the roof space, pull the ducting taut and tape it off at the 150mm to 125mm reducer.

Extend each length of the 125mm aluminium foil ducting, pulling it taut, and tape off the three extraction points to the MultiVent unit.

Install electrical wiring as per page 3 of the instruction manual.

Electrical Connections

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

With the power off, connect a suitable mains power cable (preferably to an existing lighting circuit) to the screw terminal block ([L], [N], [Earth]) connections. Use the cable clamps and clip provided to secure the lead.

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 10 of this document for details.

The switched live output (230V AC) from any other switch or controller (such as a simple latching pullcord or push button switch, humidistat, or PIR detector) can be connected to the [LS] terminal instead of connecting to a lighting circuit.

NOTE: [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.

Manual Switching to Extract Surplus Hot Internal Air - Summer Overheating

MultiVent can be switched on manually to extract surplus hot air from the house. This hot internal air may, for example, be created due to solar heating in well-sealed and insulated new homes, especially during hot summer conditions.

MultiVent can be manually controlled from wall switches that are wired to [LS1] and/or [LS2] above.

This will extract air from all grilles in the house without Delay On or Overrun timing, as per the system's default settings. However, if Delay On or Overrun time settings are required, these can be set via the Configurable parameters - see page 9 of this manual.

Low Voltage Connections

Important: Use 4-core, low voltage, twisted pair, telecoms type cable for accessories. Accessories are connected via the IO (Input Output) PCB; see the Low Voltage Connections diagram in the Main fitting and wiring guide.

The RS485 terminals are used to connect compatible sensors and switches. The connection allows sensors to be daisy-chained to simplify wiring. The maximum length of cable run from the unit is limited to 250m. Once accessories are wired to the unit, they must be paired to the unit to function correctly.

Diagram showing low voltage switch connections for Boost & Low Speed, illustrating connections to RS485, 5V, GND, and digital input/output terminals.

Feature Descriptions

Comfort Mode

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

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

Delay On

A delay can be set so that the unit will not respond to an input until after the set delay has elapsed; applies to LS inputs only.

Overrun Timer

The unit can be set to run for a defined period after the input is removed; applies to LS inputs only.

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 change during the day.

Humidity – Threshold

The unit will boost when the RH is above the threshold set point.

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. Note: The display doesn't show a decimal point; for example, at a threshold voltage of 5.2V, it is displayed as “52” on the unit.

Digital Inputs

The unit can be set to change speed (selectable), based on whether the digital inputs are above or below the threshold voltage. See the table of Low Voltage Connections for details.

Display Lock

To protect the settings on the MultiVent unit, a pin code can be enabled via the main menu. Once the lock function has been enabled, the Pin code can be set. The 3-digit pin is A to F, 0 to 9, and the default is LoC.

Unit Adjustment & Configuration

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. The display will enter standby mode after 30 seconds; press the Mode button to turn the display back on.
4. Changes to the settings can be made via the [+] and [–] buttons; the Mode button will accept changes and move onto the next menu option.
5. When setting the speeds, there is an internal logic: Low < Normal < Boost < Purge. I.e., Boost is always higher than Normal.
6. 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.
7. To restore factory settings, press and hold the “Mode” button for 10 seconds.

User Configurable Parameters

Commissioning – Typical 3 Room System

In the following step, we will provide an example of how to wire and control an MultiVent system hardwired to a Bathroom, Kitchen, and Toilet. The MultiVent will utilize Humidity – Rapid Rise in its response, and the 2 larger rooms (Bathroom and Kitchen) will also provide a PURGE speed function if these 2 rooms are switched on together.

Before commencing, please ensure that all power is OFF and ensure that it is electrically safe before starting.

Wire the 230VAC connections as per the diagram below. Wire mains connections from a suitable source (lighting circuit) or add a new dedicated circuit from an RCD protected 10A MCB with the cable to [L] (live - BROWN), [N] (neutral - BLUE), and [E] (protective earth – GREEN/YELLOW).

Wire a 230V connection from a switch located in the Bathroom that could be either a dedicated FAN switch (or a connection from a LIGHT switch) and connect the [L] (BROWN) wire back to [LS1]. Do the same from a switch located in the Kitchen and connect the [L] (BROWN) wire back to [LS2]. Hardwire a NEUTRAL LINK (BLUE or BLACK) from the [N] (neutral - BLUE) mains connection to the connection labelled [NS] (neutral switched).

Diagram for a typical 3-room system showing mains connections ([L], [N], [E]) and switched live connections ([LS1] for Bathroom, [LS2] for Kitchen) to the unit, with a neutral link to [NS].

For the toilet, the MultiVent will use its Extra Low Voltage connections for control. Using a short piece of wire, connect a 0.5mm (or similar sized wire) from the GND terminal at the RS485 connection to the COM terminal adjacent to DIN 2 (digital input 2) + connector. Using a twin red TPS cable, connect one RED core to the + connector at DIN 2 and connect the other RED core to the 5V terminal at the RS485 connection. Run the other end of the cable to the toilet FAN switch and connect the 2 red cores to the C (common) and the normally open (usually labelled 1) connections at this switch. See diagram below.

Diagram illustrating the low voltage wiring for toilet control, connecting GND to COM for DIN2, and RED wires to DIN2+ and 5V terminals, leading to a toilet switch's common (C) and normally open (1) terminals.

Using instructions from the section “UNIT ADJUSTMENT”, make the following changes:

• LS1 change from Low to BOOST
• D2 change from Purge to BOOST

With this completed, the MultiVent, once switched ON, will operate in NORMAL speed (35%) when the bathroom FAN switch is turned on. The MultiVent will operate at BOOST (70%) speed clearing away steam and humidity. If the kitchen FAN switch is turned on, the MultiVent will operate at BOOST (70%). If both bathroom and kitchen FAN switches are turned on together, the MultiVent will operate at PURGE (100%) speed, helping to clear away steam and cooking odours. The toilet FAN switch will also turn the MultiVent on to BOOST (70%). Please note that only having the 2 larger rooms (bathroom and kitchen) switched on will activate PURGE (100%) speed.

FOR COMPLIANCE WITH G4/AS1 CLAUSE 1.5

These applications are to be installed and maintained to the requirements of AS/NZS 3666.1 and AS/NZS 3666.2.

Fault Codes

If the MultiVent unit detects a fault, it will display an error message on the HMI display.

Spare Parts

WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED FROM THE POWER SUPPLY DURING PART REPLACEMENT.

• Individual faulty parts should not be replaced due to complexity of assembly. Only the full scroll assembly is replaceable.
• To remove the scroll assembly, isolate the power, then use a coin or similar to depress the cover retention clips and remove the cover.
• Disconnect and remove the power supply and signal leads.
• Remove the scroll assembly by unscrewing the two screws and unclipping the clips in the opposite two corners and lift the scroll assembly out of the housing.
• The fan has sealed-for-life bearings, which do not require lubrication. Expected service life is at least 45,000 hours continuous running.
• Upon reassembly, check all fixings are tight and secure.