Vent-Axia MULTIVENT MV250

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Summary

Important Installation Warnings

Read Instructions Before Installation

Crucial safety advice before commencing the installation process.

Prohibited Installation Areas

Lists environments where the product must not be installed due to hazards.

Safety and Guidance Notes

Wiring Compliance and Isolation

Ensure wiring meets regulations and use a double-pole isolator switch.

Installation Location Requirements

Spacing rules from bath/shower trays and flue outlets for safety.

Appliance Usage and Airflow

Proper use with fuel-burning appliances and condensation drain needs.

Environmental and Usage Precautions

Avoid water spray, ensure outdoor venting, and child safety guidelines.

Product Introduction and Siting

Multivent Overview

Explains the product's purpose, capacity, and mounting flexibility.

Siting Responsibility

Installer's duty to consider all system design aspects for placement.

Mounting Orientations

Details base, vertical, and ceiling mounting options with condensate drain placement.

Installation Procedures

Unit Positioning and Securing

Position the unit considering ventilation, services, and access for installation.

Duct Connection Guide

Instructions for removing spigot caps and connecting ducts of different sizes.

Ducting and Drainage Setup

Guidelines for duct insulation, sloping, and connecting the drainage system.

Electrical Wiring and Safety

Power Isolation and Earthing

Critical warnings on isolating power and earthing the unit.

Terminal Connection and Supply Check

Accessing terminals, verifying supply voltage, frequency, and phase.

Wiring for Speed Control

Connection arrangement for achieving three speeds and energy efficiency.

Product Fiche and Specifications

Disposal and Guarantee Information

Product Disposal Guidelines

Instructions for environmentally responsible disposal and recycling.

Vent-Axia Product Guarantee

Details of the two-year warranty and claim procedures.

The Multivent MV250 MEV Unit is a sophisticated mechanical extract ventilation (MEV) system designed for simultaneous ventilation of up to four separate areas within residential buildings, such as bathrooms, kitchens, and toilets. This inline ducted unit is engineered for continuous 24-hour operation and is not intended for use with a delay timer. It employs a highly efficient backward curved centrifugal motor impeller set, ensuring effective air extraction.

Function Description:

The primary function of the Multivent MV250 is to provide continuous mechanical extract ventilation, removing stale and moisture-laden air from multiple rooms. It is designed to maintain good indoor air quality and prevent condensation build-up. The unit can be connected to between two and four intake ducts, with three possible intake points on the case sides and one in the base, allowing for flexible installation configurations. The MV250 operates at three selectable speeds—low, medium, and high—which can be controlled by external sensors, enabling demand-controlled ventilation to optimize energy efficiency. When used to extract air from rooms containing fuel-burning appliances, it is crucial to ensure adequate air replacement for both the fan and the appliance. The unit is fitted with a condensate drain to manage moisture extracted from the air, which is essential when handling moisture-laden air.

Important Technical Specifications:

Model ID (Stock Ref.): MV250 - 181510 - LDC
Power Supply: 220-240V~50Hz, 1 Phase supply.
Fuse Rating: 3A.
SEC Class: C.
SEC Value ('Average'): -25.71.
Max. Flow Rate: 489.6 m³/h.
Max. Power Input: 63.3 W (@Max.Flow Rate).
LWA (Sound Power Level): 51.53 dB.
SPI (Specific Power Input): 0.16 W/(m³/h).
Control Factor: 0.65.
Control Typology: Local Demand Control.
Declared Leakage Rates: <5% Internal, <5% External (for Ducted UVUs).
Annual Electricity Consumption (AEC): 1.03 kWh/a.
Annual Heating Saved (AHS): Average: 28.30 kWh/a, Warm: 12.80 kWh/a, Cold: 55.36 kWh/a.
Ducting Compatibility: Designed for 125mm ducting, with provisions for 100mm ducting using a cap surround.
Ingress Protection (IP) Rating: IP22.
Operating Temperature Range: Ambient exhaust air temperatures should be between -5°C and 40°C.
Relative Humidity: Should not exceed 90%.
Motor: Backward curved centrifugal motor impeller set.
Over-heating Protection: Standard Thermal Overload Protection.

Usage Features:

Multi-Room Ventilation: Capable of ventilating up to four separate areas simultaneously, making it ideal for residential applications with multiple wet rooms.
Flexible Mounting Orientations: The unit can be mounted in three different orientations (base-mounted, vertically mounted, and ceiling-mounted) to accommodate various installation requirements in roof voids with a minimum height of 250mm.
Demand-Controlled Ventilation: Wiring arrangements allow for connection to external sensors (e.g., humidity, occupancy) to automatically adjust fan speed between low, medium, and high settings, optimizing ventilation based on actual demand and enhancing energy efficiency.
Continuous Operation: Designed for 24-hour continuous use, ensuring constant air quality management.
Ducting Adaptability: Supports both 125mm and 100mm ducting, with specific instructions for adapting the spigots.
Condensate Management: Features a condensate drain on the unit housing, with different drain positions depending on the mounting orientation, to effectively manage moisture extracted from the air. Additional drainage from connected ducts may be required in certain vertical installations.
Compliance: Designed to comply with the Domestic Ventilation Compliance Guide (England and Wales) and Commission Delegated Regulation (EU) No 1254/2014.

Maintenance Features:

Accessible Terminals: Access to the connection terminals is located under the top cover, secured by four screws, facilitating wiring and maintenance.
Thermal Overload Protection: The motor is equipped with Standard Thermal Overload Protection, which automatically switches the fan off in case of a fault or obstruction. This feature protects the motor from damage and indicates a need for inspection.
Troubleshooting Guide: In case of thermal overload, users are instructed to isolate the unit, check for and remove any obstructions, allow the motor to cool, and then reconnect. If the issue recurs, a service engineer should be contacted.
Filter Warning (Implicit): While not explicitly detailing filter replacement, the product fiche mentions "Position and description of visual filter warning for RVUs intended for use with filters, including text pointing out the importance of regular filter changes for performance and energy efficiency of the unit," suggesting that regular filter maintenance is crucial for optimal performance and energy efficiency.
Disassembly Instructions: The product fiche indicates that disassembly instructions are available via the provided internet address (www.vent-axia.com), which is useful for end-of-life recycling or repair.
Warranty: Vent-Axia offers a two-year guarantee against faulty material or workmanship, provided the unit is installed and used according to instructions, connected to a suitable electricity supply, and not subjected to misuse, neglect, damage, or unauthorized repairs.