Envirovent MEV SPIDER User manual

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01 Introduction
You are about to install a product that is designed to outlast
the life-cycle of the building. Once installed the unit will operate
continuously for 5 years and beyond without a major service.
Please therefore ensure that this product is treated with care
and installed properly i.e. for the life of the building. If the unit
is mishandled you might break it! This invalidates the warranty.
And remember, if you have any problems please call our
dedicated Technical Team. We are always pleased to help and
in an emergency will come out to site quickly, completely free
of charge.
Thank you for choosing EnviroVent
The fastest growing ventilation company in the UK
HOTLINE: [phone]
Due to our policy of continuous innovation and improvement EnviroVent
reserves the right to alter products specication and appearance without
notice.

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02
02 About The Unit
EXPLODED VIEW
Lid
Electronics assembly
Black box
Ø100 input
Ø125 spigot
extract to atmosphere
The EnviroVent MEV Spider is a low-energy,
continuous mechanical extract ventilation
system designed with multiple extract
points to simultaneously draw moisture-
laden air out of the wet rooms, whilst
minimising the migration of humidity to other
rooms. The extract unit is centrally located
in, for example, a hallway cupboard, with
ducts running from the unit to the kitchen,
bathroom, en-suite and other wet zones.
The unit is suitable for houses, apartments
and communal residences with kitchen plus
up to 6 additional wet rooms, providing high
centrifugal performance with low running
noise. Highly cost eective and value for
money, the MEV Spider comes with a full
ve year guarantee.
Commissioning panel
Fan scroll and fan

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03 Wiring Diagram
03
Electrical Connections
The appliance must be earthed and a double pole switch having a minimum contact separation
of 3.0mm must be used to provide isolation for the unit. All wiring must be completed by a
qualied electrician. This appliance is suitable for 230V ~ 50Hz single phase supply fused at 3
amps. The appliance is supplied with a 3 core mains exible cable.
If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualied persons in order to avoid a hazard.
Emergency shutdown details - Unit to be isolated from the mains by turning it o at
the isolating switch.
After Sales Service - We recommend you do not dismantle or remove any other parts
than those mentioned, as any tampering would automatically cancel the guarantee. If
you detect any fault please contact EnviroVent.
Remote control version (MEVS-W) Humidity and standard versions
(MEVS-H, MEVS)

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04
Supply Voltage 230V / 50-60Hz / 70W Max / 0.5 A Max
Dimensions H 387mm x W 440mm x D 198mm
Ventilation Capacity 135 l/s @ 100pa. Max 151 l/s (545m3/h)
Weight Boxed 5.8kg | Unit 4.3kg
04 Technical Specications
Performance Curve
Dimensions (mm)
198
300
Ø125
30
380
440
357

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05 Installation Instructions
IMPORTANT
Be sure to have read and understood these
instructions before beginning the installation
process.
PRE-INSTALLATION CHECK LIST
Make sure that the unit can physically t in to
the desired location.
The MEV Spider unit should be situated so
that access for maintenance or replacement
of parts is possible. Make the ductwork runs
as short as possible. Having the most direct
route and using as few bends as possible
will reduce air resistance and improve the
eciency of the unit.
SAFETY AND RECOMMENDATIONS
• All wiring must comply with Building
Regulations and the current I.E.E. Wiring
Regulations (BS7671) or the equivalent
standards for your country. The nal
installation should be examined and tested
by a qualied electrician.
• Precautions must be taken to avoid the
back-ow of gases into the dwelling from
the open ue of gas or other fuel-burning
appliances.
• Make sure the mains supply complies with
the rating label for voltage, frequency and
phase.
• This appliance can be used by children
aged from 8 years and above and
persons with reduced physical, sensory or
mental capabilities or lack of experience
and knowledge if they have been given
supervision or instruction concerning
use of the appliance in a safe way and
understand the hazards involved. Children
shall not play with the appliance. Cleaning
and user maintenance shall not be made
by children without supervision.
05

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06
05 Installation Instructions
Description Quantity Item
MEV Spider Unit 1x
Spigots 3x
Spigot Blank 1x
Fixing Kit 1x
Screws 8G X 2.0” 4x
Washers 4x
Plasterboard Plugs 4x
Adhesive Foam Pads 4x
Controls
Intelligent Humidity Tracking (Automatic)
MEVS-H and MEVS-W versions only
When the MEV unit senses a rise in humidity,
caused by increased moisture generation such
as through cooking or showering, the extract
and supply airows will slowly begin to increase
in direct proportion to the increase in humidity.
It will then automatically track back down again
when humidity falls. This controls condensation
quietly and eciently.
Boost - Wall Switch
The MEVS and MEVS-H comes with a boost
switch as standard to activate boost when
required. The unit will remain at boost for as
long as the switch is on.
Boost - Remote Control
MEVS-W units come with a remote control
switch to activate boost. The unit remains
at boost for 20 mins. See page 9 for further
information.

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Mounting the unit
1. The unit maybe installed in any vertical or
horizontal orientation
2. Use the unit to mark xing holes, ensuring
clearance around the MEV unit. Drill 4 x
Ø8mm holes, position plasterboard plugs
in the mounting surface and foam pads
on the back of the unit’s mounting tabs.
3.
4. Secure the MEV unit on all four corners.
5. Electrical connections (see page 3).
07
05 Installation Instructions
Adhesive
foam pad
Washer
Screw
Plasterboard
plugs

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Connecting the ductwork
1. Scribe around the outer edge of the
required spigot blank MAX x 3 (a). Knock
out the blank with a light tap (b).
2. Remove blanks from inside the unit.
3. It may be necessary to remove excess
material with a knife.
4. Push in spigot and x with self tapping
screws provided.
5. Ductwork, ridged and exi must be
securely xed.
6. If a blank is removed in error, the spigot
hole must be lled with the spare blank
provided. Firmly glue in place.
08
05 Installation Instructions
(a)
(b)

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09
06 Commissioning
Boost controls
The MEV Spider operates continuously
on ‘Normal’ setting to ensure the home is
ventilated at the appropriate level although
you can boost the system via the wired or
remote control switch, if tted.
For remote control switches, press the
button once, the green LED will light up and
the unit will go to boost. The boost time is
set to 20 minutes as standard. When the
battery requires changing, unscrew the
switch front cover. The battery is located
on the back of the cover. Battery type - 3V
Lithium, CR2032.
To pair additional remote control units
(RC units only)
1. Insert insulated point into hole A to contact
push button
2. Press for 5 seconds until unit LED ashes,
then release
3. Press remote control button and the
green LED will light up
4. RC is now paired
Remote control
Remote control button
Flashing red
LED = not paired
Constant green
LED = paired
LED
Hole A

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10
Setup guide for the MEV Spider
The control switch is found behind the front
cover.
Commissioning mode is chosen by pressing
the SET button for 4 seconds, all sensor
inputs will be disabled in this mode so that
they do not interfere with ow rates. LEDs will
light with the Trickle ashing, this indicates
that the ow rate may now be increased/
decreased as required.
The next press of the SET button will move
commissioning to the next setting, Boost.
When the unit has been fully commissioned,
press the SET button for 4 seconds and this
will put the unit back into status mode. If the
unit is not put back into status mode after
commissioning, it will automatically revert
back to status mode after an hour or if the
power is turned o.
Note: Settings will be retained if the power
supply is interrupted.
06 Commissioning
LED Indications
Constant LED Flashing LED
B - Humidity
C - Boost State B - Service required
Boost and trickle LED indications
Commissioning mode only

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06 Commissioning
Commissioning of a continuous running Multiple Extract Ventilation system- MEV
* Applicable in England and Wales. For other countries please refer to your local building regulations.
Commissioning of the system is
necessary to provide adequate ventilation
to the dwelling, as stipulated in Approved
Document F (ADF) of the Building
Regulations*
Conditions - all maintenance and
development works should be completed
prior to the commissioning of the unit, this
is to avoid high levels of dust being drawn
into the system and general disturbance
to the setup. The unit should only be
commissioned when fully installed, with
power, ductwork, valves and vents in place.
See Domestic Ventilation Compliance
Guide.
Equipment required - Anemometer which
is capable of measuring l/s or m³/hr.
Commissioning method - Once the
previous conditions are met, boost and
trickle rates need to be set. These should
be set as outlined in the commissioning
guide (pages 9-10).
Commissioning guide
Boost rate (minimum high rate)
• Determine the whole building ventilation rate.
See ADF of the Building Regulations.
• Open ceiling/wall valves.
• Measure all extract points summing the
individual room rates. Measurements
to be carried out with an appropriate
anemometer.
• Adjust using and buttons, press up
or down until the total extract rate is met.
See the individual product’s instruction
guide for method (pages 9-10).
• When the desired overall extract rate
is achieved, the individual valves
should then be adjusted to draw the
appropriate volume of air from each room,
typically starting with the largest extract
requirement rst: kitchen, bathroom,
utility room, en-suite and WC.
• It may be necessary to adjust the fan unit
slightly to account for increased pressure.
• When adjustments are completed the
valves should be locked into position to
maintain settings.
Trickle rate
• This should be set around about 75% of
the Boost rate.
See ADF of the Building Regulations.
• As the valves have been commissioned
at boost they will not need to be altered
further, the trickle buttons should be
adjusted up or down, until the lower
extract rate is met. See the individual
product’s instruction guide for method on
pages 9-10.
For guidance on good installation
practice for MEV systems see the
latest edition of the latest edition of the
Domestic Ventilation Compliance Guide*.
This guide provides in depth information on
all aspects installation, inspection, testing
and commissioning.
11

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12
07 Checklist
MEV Spider installation instructions have been understood
Ductwork is Ø100mm or larger with no more than 10% flexi used (90% rigid)
All ducts, vents and diffusers are securely connected & sealed
The unit is securely fixed into position with enough space left for servicing
All major building works have been completed prior commissioning
Unit has been commissioned to meet Part F of the Building Regulations with a
calibrated anemometer
Commissioning data has been recorded
Inform building owner/user on how to operate and maintain the system
These checks are required to ensure the proper function of this unit.
For EnviroVent Technical help call 01423 810 810
Checklist to ensure
Guaranteed Installed
Performance

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13
08 Maintenance
There are no special requirements for any
maintenance within a ve year period. The
unit is easy to clean by simply removing the
lid and motor plate. After carrying out work,
make sure all the screws are in place.
Cleaning
Isolate the unit from electrical mains
supply before removing any cover, or
servicing the unit.
1. Remove 4 screws on top of the lid.
2. Remove 4 screws on top of motor plate.
Pull backwards from the spigot and then
lift up. Motor mounting remains attached
to the main case via cabling.
3. After maintenance replace all components
and xing screws.

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14
10 Warranty
09 Guarantee
The EnviroVent MEV Spider is covered by a full 5 year warranty which will benet the occupier
over many years. The unit will be set according to the size of the property and will operate
continuously. There is no requirement for any maintenance within the 5 year period.
What should I do if I have a problem?
If, after thoroughly reading this booklet, you feel that your MEV Spider is not working correctly, you
can telephone [phone] (operational from 8:00am to 5:00pm Monday to Friday), and ask
for technical assistance. You will either be given guidance over the telephone, or an arrangement
will be made for an engineer to visit. In any event, please have the following information ready.
This will enable your call to be dealt with quickly and eciently.
Please note that proof of purchase by the way of a receipt is required and that any fans bought
from an unapproved source, including but not limited to Ebay, will render the guarantee invalid.
Serial number of the unit:
We appreciate you choosing this quality EnviroVent product, which is designed and
manufactured to the highest specication in Harrogate, North Yorkshire. We are condent
that you will be delighted with the performance of the system and the resulting improvement
in air quality in your home after the installation of the unit.
Your warranty covers any defect or break down that arises due to faulty materials or
construction.
WARRANTY CONDITIONS AND EXCLUSIONS
• The system must be correctly installed and operated according to the instructions contained
in the user guide supplied.
• The warranty will be rendered invalid if the system has been serviced, maintained, repaired,
taken apart or tampered with by any person not authorised by EnviroVent Ltd.
• The warranty will be rendered invalid if the unit is turned o. Turning the unit o can damage it.
• The warranty does not cover accidental damage, misuse or abuse.
• The warranty is in addition to your statutory or legal rights.
• The guarantee will only be honoured from approved suppliers.

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EnviroVent Ltd
EnviroVent House
Hornbeam Business Park
Harrogate
HG2 8PA
01423 810 810
[email protected]
www.envirovent.com
Due to our policy of continuous innovation and
improvement EnviroVent reserves the right to
alter products specication and appearance
without notice.
E&OE MKT ENV230-V6-06.01.15