Airflow AIROVENT MEV WH4H CENTRAL EXTRACT User manual

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AIROVENT RF MEV WH4H CENTRAL
MECHANICAL EXTRACT
VENTILATION UNIT WITH BUILT-IN
HUMIDITY SENSOR
Installation / Operation and Service Guide
For unit versatility it is supplied without a controller. A
choice of controllers is available at www.airflow.com
80001183 Issue 04 –06/23

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Contents
Introduction..............................................................................3
Unit Dimensions (mm).............................................................4
Unit Specifications...................................................................5
Safety Information and Guidance ............................................6
Transport and Storage.............................................................7
Electrical Installation................................................................8
................................................................................................8
PCB Main Features .................................................................9
Mechanical Installation ..........................................................10
Duct Connections ..................................................................13
Pairing RF Controllers to Unit................................................14
Fan Performance Settings.....................................................16
Dip Switch Settings - Table A................................................17
Dip Switch Settings –Table B ...............................................18
Flow / Pressure Graph A .......................................................19
Flow / Pressure Graph B .......................................................20
Service and Maintenance......................................................21
Unit & Packaging Disposal ....................................................21
Assorted Accessories............................................................24
Warranty................................................................................25

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Introduction
The AIROVENT MEV WH4H CENTRAL EXTRACT is
operated using a Radio Frequency (RF) control, which
means that the central extract unit can be switched
remotely and wirelessly by one or several remote
controls, up to a maximum of 20. The RF control signal
is received by a receiver on the printed circuit board
(PCB) inside the central extract unit. A choice of two
controls is available to be purchased separately:
•RF Controller –Basic (90001489)
•RF Controller with CO2 Sensor (90001490)
Each remote control is intended for exclusive use with
Airflow AIROVENT RF MEV WH4H Central Extract
Units. If bought separately, the remote control must be
connected for the first time to the Airflow ventilation unit
by the installer.

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Unit Dimensions (mm)
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Air to outside
Air from wet rooms

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Unit Specifications
.

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Safety Information and Guidance
IMPORTANT!
Read these instructions carefully before installing
this Mechanical Central Extract Unit.
This manual covers the operation of the AIROVENT RF
MEV WH4H MECHANICAL EXTRACT UNIT WITH
BUILT-IN HUMIDITY SENSOR only. It must therefore
be read in conjunction with the relevant AIROVENT RF
MEV WH4H CONTROLLER User Manual. (Product and
part numbers referenced on page 3.)
Installation of this unit must be carried out by a qualified
and competent person and carried out in clean, dry
conditions where dust and humidity levels are at
minimum.
All wiring must conform to current I.E.E Wiring
regulations –see Electrical Installation on page 8 for
more information. Do not install this unit in areas where
the following may be present or occur; Excessive oil or a
grease laden atmosphere, corrosive or flammable
gases, liquids or vapours, ambient temperatures above
40°C or below 0°C, humidity levels over 90% or a wet
environment.

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Transport and Storage
Units should be stored in their original packaging in a dry
environment protected from the weather. If palletised
quantities are stored or transported, it is recommended
they are covered to protect against particulate damage
and contamination.
Suitable storage temperatures are between –10ºC and
+40ºC.
Care should be taken when re-packing any unit to ensure
the packaging is suitable for the required form of
transport. Damage due to improper transportation,
storage or installation is not covered under warranty. Care
should be taken when lifting. Correct lifting techniques /
apparatus should be used when necessary. Dropping or
sharp blows to the fan can cause damage. Any damage
to the fan or packaging should be inspected by a suitably
qualified person or returned to Airflow Developments Ltd
for inspection before use.
Fans should not be lifted or carried by an electrical lead,
if fitted.

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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 Hz single phase
supply. Electric circuit to be used should be isolated
before any work is carried out.
All electrical connections and controls can be found under
the units white, top protective cover held on by locking
tabs. See Fig. 1 - page 12. The units electrical supply
cable must be fitted through the two cable retaining paths
moulded into the unit’s electrical connection tray. See
below:

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All cables should be suitably retained and enclosed where
necessary to prevent damage taking place. A three-pole
lockable isolation switch with a 3mm contact gap should
be used on the mains supply to the unit.
The unit is supplied already fitted with a 1 metre long,
three core cable as standard. Brown = Live. Blue =
Neutral. Green/ Yellow = Earth. This unit should be
protected by using a 3amp inline fuse.
Before function testing the fan, ensure the impeller runs
freely. Also refer to page 12, Pairing Remote Controls.
Function testing should be carried out by switching the fan
on for a short time. When the fan is running, checks
should be carried out for: impeller rotation direction,
undue noise or vibration and power consumption.
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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PCB Main Features
Push button
Red/ Green
LED
Mains Power
in (230V –50
–1Ph)
Dip switches
Cable to RF
Receiver