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Summary of Contents for Airflow AIROVENT MEV WH4B
- Page 1 80001184 – Issue 1 02/22 Installation / Operation and Service Guide MEV WH4B & MEV WH6B Part No`s: 90001495 & 90001496 Central Mechanical Extract Ventilation Units 90001496 90001495 Page 1 of 23...
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Page 2: Table Of Contents
Contents Page Nº Heading Unit Dimensions Unit Specifications Transport and Storage 6 – 7 Electrical Installation Wiring Diagram 9 – 10 Mechanical Installation 11 – 14 Duct Connection 15 – 16 Fan Performance Settings Flow / Pressure Graph 18 – 19 Service and Maintenance Fan and Packaging Disposal Assorted Accessories... - Page 3 Overall Unit Dimensions Page 3 of 23...
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Page 4: Unit Specifications
Unit Specifications Voltage Required: 230V – 50 / 60Hz – 1Ph Three Fan Speed Bands Available: Band 1(Low) = Two speeds – 87 and 123m³/h Watts= 5 & 8 Band 2 (Medium) = Eight speeds – 97 to 234 m³/h Watts = 6 To 27 Band 3 (High) = Eight speeds –... -
Page 5: Transport And Storage
Any damage to the fan or packaging should be inspected by a suitably qualified person returned Airflow Developments Ltd for inspection before use. Fans should not be lifted or carried by an electrical lead, if fitted. Page 5 of 23... -
Page 6: Electrical Installation
Electrical Installation All electrical installations must be carried out by an approved electrician in accordance with the latest IET BS7671 Requirements for Electrical Installation, Low Voltage Directive 2014/35/EU, Machinery Directive 89/392/CE or the appropriate regulations in the country of installation. All fans require a 240V 50/60 Hz single phase supply. - Page 7 Immediately switch off the fan should any problems be found, and contact Airflow Developments Ltd. Fan motors used are suitable for continuous running and have a rated duty type S1 (motor is suitable to this duty type and rating at which the fan may be operated for an unlimited period).
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Page 8: Wiring Diagram
Wiring Diagram Page 8 of 23 230V – 50 / 60Hz – 1Ph L1 = High Speed L2 = Medium Speed L3 = Permanent Live Airflow Developments fan speed switch, Part number 90000541 should be used. Page 8 of 23... -
Page 9: Mechanical Installation
Fans should be installed to a sufficiently solid structure giving adequate support. Fixings supplied with the unit should used. Alternatively, Airflow Developments Rubber mount part number 90001294 (set of four) can be used to help protect against mechanical noise transmission into the mounting surface. - Page 10 Mechanical Installation contd. Air out Page 10 of 23...
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Page 11: Duct Connection
See fig.D page 10. If the ducting from this port is installed vertically a condensation trap should be fitted (Airflow part number: 90001242). 125mm diameter ridged ducting, or a ridged duct with at least 90% free surface area of 125mm diameter duct should be used. - Page 12 Final connections can be made with a short length of flexible ducting (Airflow part number: 52641009) and the correct sealing clamps (Airflow part number: 51849403). The use of excessive amounts of flexible ducting will result in high system pressures and a noisy system.
- Page 13 20 to 30mm. AirflexPro round ducting should be held in place using the correct clips (Airflow part number: 90000352). A soft “O” Ring should then be positioned in the first full groove of the duct. See fig G page 14.
- Page 14 Duct Connection contd. (Number: 90001242). Ridged duct should be used wherever possible, as previously stated for the MEV WH4 unit. Fig.F Fig.E Fig. H Fig. G Fig. I Page 14 of 23...
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Page 15: Fan Performance Settings
Fan Performance Settings The airflow requirements of a dwelling should be calculated and conform to Building Regulations Part F, Volume 1. The performance of the unit is broken down into three bands, low, medium, and high. Each band has a number of fan speeds, which can be set by adjusting the dip-switch settings. - Page 16 Fan Performance Settings contd. Page 16 of 23...
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Page 17: Flow / Pressure Graph
Flow / Pressure Graph Service and Maintenance Page 17 of 23... - Page 18 Failure to do so causes excess system pressure which will reduce the systems airflow, make the system noisier and ultimately lead to fan unit failure. Cleaning the fan unit can be achieved by firstly disconnecting the duct from the fan mounting case.
- Page 19 After re-connecting the electrical supply, the unit should be switched on. If there is any undue noise switch the unit off immediately and rectify the fault. If the fault cannot be found contact Airflow Developments advice info@airflow.com. Tele:+44(0)1494525252. Page 19 of 23...
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Page 20: Fan And Packaging Disposal
Fan and Packaging Disposal These fan units consist mainly of steel, iron, aluminium, copper, electrical insulation materials, cables, wires, and plastic. Complete fans and parts that are at end of life due to wear and tear, corrosion, fatigue and or other effects that can not be discerned must be disposed of in the correct manner conforming to local and / or international guidelines and regulations. -
Page 21: Assorted Accessories
Assorted Accessories Page 21 of 23... -
Page 22: Warranty
Warranty Airflow guarantees the Central Extract Fan Units: MEV WH4 and MEV WH4B designated in these instructions for 2 years from date of purchase against faulty material or workmanship. Applicable to units installed and used in the UNITED KINGDOM. Warranty covers the fan and not the reinstallation if required. - Page 23 Airflow Developments Ltd shall not be liable for any loss, injury or other consequential damage, in the event of a failure of the equipment, arising from, or in connection with, the equipment excepting only that nothing in this condition shall be construed as to exclude or restrict liability for negligence.
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