Vent-Axia Centra Lo-Carbon SELV

Product Overview

The Centra Lo-Carbon SELV 100mm fan is a continuously running extract fan designed for kitchens, utility rooms, bathrooms, and toilets. It features a long-life ball bearing DC motor with anti-vibration mounts for low noise transmission. The fan can be wall, window, or panel/ceiling mounted.

Stock References:

• 443175A - Timer (T)
• 443176A - Humidistat-Timer (HT)
• 443177A - Humidistat - Timer - Pullcord (HTP)
• 447128A - Timer-Pullcord (TP)

Electrical Supply:

• Fan Units: 12V DC SELV (Class III)
• Controllers: 220-240V 50Hz Mains Supply (Class II) with 12V DC SELV Output

Important Safety and Guidance Notes

WARNING: READ THESE INSTRUCTIONS BEFORE COMMENCING THE INSTALLATION.

DO NOT install this product in areas where:

• Excessive oil or a grease laden atmosphere is present.
• Corrosive or flammable gases, liquids or vapours are present.
• Ambient temperatures are higher than 40°C or less than –5°C.
• Possible obstructions hinder the access or removal of the Fan.

Safety and Guidance:

• All wiring must comply with current I.E.E. Regulations or appropriate national standards and be installed by a qualified person.
• The Fan must be provided with a local isolator switch with at least 3mm contact separation for all poles.
• Ensure the mains supply (Voltage, Frequency, and Phase) complies with the rating label.
• The Fan must only be used with appropriate Vent-Axia products and fixed wiring.
• If the fan is used to extract air from a room with a fuel-burning appliance, ensure adequate air replacement for both the fan and the appliance.
• The Fan should not be used where it is liable to be subject to direct water spray for prolonged periods.
• For ducted fans handling moisture-laden air, a condensation trap should be fitted. Horizontal ducts should slope slightly downwards away from the Fan.
• 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 supervised or instructed by a person responsible for their safety.
• Young children should be supervised to ensure they do not play with the appliance.
• The exterior grille should be at least 2.3m above the ground to prevent access to moving parts. If positioned between 0-2.3m, use the Vent-Axia wall kit for protection.

IMPORTANT: ONLY CONNECT PRODUCTS FROM THE CENTRA LO-CARBON SELV RANGE. THESE FANS ARE DESIGNED FOR 12V DC AND ARE NOT COMPATIBLE WITH OTHER VENT-AXIA CONTROLLERS. DO NOT CONNECT MORE THAN ONE FAN TO THE CONTROLLER.

Accessories (Not Supplied)

• Wall Fitting Kit: Available in white (stock ref. 254102) or brown (stock ref. 254100) 100mm kits for most walls using telescopic liners.
• Window Fitting Kit: Available (stock ref. 442947).
• 6" TO 4" ADAPTER PLATE: To cover existing 150mm (6") installations (stock ref. 443334).

A. Installation

IMPORTANT: The fan should only be used in conjunction with fixed wiring.

Siting the Controller

1. The controller must not be installed in a shower cubicle or enclosure. It must be sited away from direct sources of water spray and out of reach (1.5m) of a person using a fixed bath or shower.
2. Site away from direct sources of heat. Ambient temperature range 0 to 40°C. Do not site in an area containing excessive levels of grease.
3. Decide where to site the controller and fan, and work out the required cable runs.

Siting the Fan

1. The electrical supply to this fan is 12V DC SELV from the mains controller. This means the fan may be installed within reach of a person using a fixed bath or shower. However, the fan must not be placed where it could be submerged in water or regularly exposed to direct water spray.
2. Site away from direct sources of heat. Ambient temperature range 0 to 40°C. Do not site in an area containing excessive levels of grease.
3. If the fan is installed in a room with a fuel-burning appliance, ensure adequate air replacement. If the fan is used to supply air into the room, the intake must be located at least 600mm away from any flue outlet.
4. Ducted Applications: For short lengths of ducting, consult Vent-Axia sales. Where excessive moisture is present, install a condensation trap in the exhaust duct. Horizontal ducts should slope away from the fan unit. Ducts passing through an unheated roof void should be insulated.
5. Avoid short-circuiting the airflow by siting the fan as far away as possible from and opposite to the main source of air replacement. (See Fig. 1)

Panel/Ceiling Mounting

1. For panel/ceiling mounting, install the fan into a closed duct system of at least 1.2m long or protected by an exterior air grille complying with national standards to prevent access to the fan's impeller.
2. Cut a 105mm diameter hole.
3. Loosen the screw at the bottom of the grille and remove the front grille. Mark screw centres through the fan back plate holes. Drill, plug, and screw into position.
4. Attach ducting as required.
5. Wire the fan as described in Section B-Wiring. Adjust settings as required (see Section C-Setup).
6. Replace the grille and tighten the retaining screw.
7. After installation, ensure the impeller rotates freely.

Wall Mounting

1. For wall mounting, cut a 117mm diameter hole and insert the wall sleeve. Slope the sleeve slightly downwards away from the fan. Cut to length and cement both ends flush with the wall faces.
2. Loosen the screw in the bottom of the grille and remove the front grille. Mark screw centres through the fan back plate holes. Drill, plug, and screw into position.
3. Fix the exterior grille with louvres facing downwards. Ensure the grille complies with national standards to prevent access to the fan's impeller.
4. Wire the fan as described in Section B-Wiring. Adjust settings as required (see Section C-Setup).
5. Replace the grille and tighten the retaining screw.
6. After installation, ensure the impeller rotates freely.

Window Mounting

1. Refer to window kit instructions supplied with the kit.

B. Wiring

WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED FROM THE POWER SUPPLY DURING INSTALLATION / OR MAINTENANCE.

IMPORTANT:

• The Controller MUST be surface mounted to allow air to circulate freely around the unit. If installed in a loft void, it MUST NOT be enclosed or covered with insulation.
• The fan should only be used in conjunction with fixed wiring.
• The cross-sectional area of supply cord used should be between 1 - 1.5mm².
• Cable entry can only be made from the rear of the fan.

1. Select and follow the appropriate wiring diagram (Fig. 2, 3, or 4).
2. Check all connections are correct and ensure all terminal connections are securely fastened.
3. Ensure the impeller rotates and is free from obstructions.

C. Setup

WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED FROM THE POWER SUPPLY DURING INSTALLATION / OR MAINTENANCE.

Accessing the Control Settings (Fig. 5 and 6)

1. Loosen the screw in the bottom of the grille and remove the front grille.
2. Carefully pull the inner cap from the centre of the fan away from the chassis.
3. Adjust the settings as outlined below.

Trickle Speed Selection (6l/s or 9l/s) (Fig. 8)

In normal running mode, the fan can extract at either 6l/s (22m³/h) or 9l/s (32m³/h) flow rate. The fan will boost to 15l/s (54m³/h) when the LS connection is switched.

• Factory set at 6l/s (22m³/h).
• Remove jumper connector (JP1) if 9l/s (32m³/h) extract flow rate is required.

Boost Speed Selection (Fig. 9)

(443175A - Timer, 443176A - Humidistat-Timer and 443177A - Humidistat-Pullcord models only)

The fan has two boost speed settings:

• Max speed: Dip switch 2 in the 'OFF' position.
• 15l/s speed: Dip switch 2 should be in the 'ON' position (Factory set).

Dip switch 1 should be in the 'ON' position for constant trickle mode.

Timer Adjustment (T, TP, HT & HTP Models) (FIG. 8)

BEFORE ADJUSTING THE TIMER, SWITCH OFF THE MAINS SUPPLY. TIMER SHOULD ONLY BE ADJUSTED BEFORE OR DURING INSTALLATION.

IMPORTANT NOTE: ON TP & HTP MODELS, THIS ADJUSTS THE OVERRUN TIME FOR PULLCORD OPERATION. ON T & HT MODELS, THE TIMER IS ACTIVATED VIA THE LS CONNECTION.

1. Remove the fan grille. The overrun timer is factory set to approximately 15 minutes. This period can be adjusted between approximately 3-30 minutes by altering the adjuster on the control PCB.
2. To REDUCE the operating time, turn the adjuster clockwise.
3. To INCREASE the operating time, turn the adjuster anti-clockwise.
4. Replace the fan grille.

Humidity Set-Point Adjustment (HT/HTP Models) (FIG. 8)

BEFORE ADJUSTING THE CONTROLLER, SWITCH OFF THE MAINS SUPPLY. HUMIDISTAT SHOULD ONLY BE ADJUSTED BEFORE OR DURING INSTALLATION.

1. Remove the fan grille. The controller is factory set to switch on at about 70% RH. The humidity set point can be adjusted from 65-95%RH by altering the adjuster on the control PCB.
2. To LOWER the set-point (make controller MORE sensitive), turn the adjuster anti-clockwise.
3. To RAISE the set-point (make controller LESS sensitive), turn the adjuster clockwise.
4. Replace the fan grille.

Pullcord (TP & HTP Models Only)

The pullcord activates the inbuilt timer overrun. Once activated, the fan remains on boost for the preset overrun time. Pulling the pullcord again during the overrun time resets the countdown timer. There is no manual way to switch the fan back to trickle.

D. Servicing and Maintenance

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

1. At appropriate intervals, inspect and clean the fan to ensure no build-up of dirt or deposits.
2. Ensure the fan is switched off from the mains supply before removing the grille.
3. Carefully push the front panel of the grille upwards away from the base part of the grille (fig. 7).
4. Wipe the inlets and front face with a damp cloth until clean.

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

Diagrams

Fig. 1: Siting the fan - Illustrates correct and incorrect fan placement relative to air sources.

Fig. 2: Continuous trickle (6l/s or 9l/s) - Wiring diagram for continuous trickle operation without remote boost facility. (Models T, TP, HT & HTP supported; TP & HTP can be boosted via pullcord).

Fig. 3: Continuous boost (15l/s or Max) - Wiring diagram for continuous boost operation without trickle facility (NOT AVAILABLE ON TP & HTP MODELS).

Fig. 4: Continuous trickle with boost facility - Wiring diagram for continuous trickle with boost facility (NOT AVAILABLE ON TP & HTP MODELS).

Fig. 5: Removing the grille for wiring and setting the controls - Step-by-step visual guide showing how to loosen the screw, pull the grille away, and push it upwards to remove.

Fig. 6: Accessing the control settings - Illustration showing how to access the internal controls.

Fig. 7: Removing the front grille panel for cleaning - Visual guide for grille removal.

Fig. 8: Trickle speed selection and T/HT/HP adjuster pots - Diagram of the control PCB showing timer and humidistat adjustment points, and jumper settings for speed selection.

Fig. 9: Boost speed selection - Diagram of the control PCB showing dip switch settings for boost speed selection on Timer, Humidistat-Timer, and Humidistat-Pullcord models.

Product Fiche

This section provides a comparison of Vent-Axia Lo-Carbon Centra SELV models based on the EU Regulation No 1254/2014.

Vent-Axia Guarantee

Vent-Axia guarantees its products for two years from the date of purchase against faulty material or workmanship, provided the product has been installed and used in accordance with the instructions, has not been misused, neglected, damaged, modified, or repaired by unauthorized personnel, and is connected to a suitable electricity supply as indicated on the product rating label.

To claim under the guarantee, return the complete product, carriage paid, to your original supplier or nearest Vent-Axia Centre, accompanied by a letter detailing the fault and proof of purchase date and source.

This guarantee is offered as an additional benefit and does not affect your legal rights.

Contact Information

Vent-Axia

Head Office: Fleming Way, Crawley, West Sussex, RH10 9ΥΧ.

UK NATIONAL CALL CENTRE

Newton Road, Crawley, West Sussex, RH10 9JA

SALES ENQUIRIES: Tel: 0844 8560590 Fax: 01293565169

TECHNICAL SUPPORT: Tel: 0844 8560594 Fax: 01293 539209

Web: www.vent-axia.com

Email: info@vent-axia.com

Vent-Axia reserves the right to alter specifications without notice as part of its policy of continuous product improvement.