Envirovent MEV SPIDER User manual

MEV SPIDER
VENTILATION UNIT INSTALLATION GUIDE
AFTER INSTALLATION THE END USER SHOULD
KEEP THIS GUIDE FOR FUTURE REFERENCE
DO NOT THROW AWAY

MEV Spider
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1
Safety
Please read and understand these instructions before beginning
installation. The unit should be installed by a competent person.
Location
Check there is space for the unit in your chosen location including
room for access and future servicing of the unit. The unit must not
affect the operation of open-flue appliances. Consider the external
vent locations in relation to open-flues from appliances e.g. boilers.
You must ensure the external supply grilles are positioned away from
open flues to avoid drawing harmful gases into the property. Consult
your local regulations or a qualified gas engineer.
Users
This unit is not intended for use by persons [including children] with
reduced physical, sensory or mental capabilities or lack of experience
and knowledge, unless they have been given supervision and usage
instruction by a person responsible for their safety. Children should
be supervised to ensure they do not play with the unit. Cleaning and
user maintenance must not be performed by children.

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Electrical Connection
The unit requires a continuous electrical power supply. Connection to
the fixed wiring must be made outside the unit in a suitable location.
It must be possible for the unit to be disconnected from the mains
supply after installation. The unit must be earthed and a double pole
isolator having a minimum contact separation of 3.0mm must be
used to provide isolation for the unit, see wiring diagram on page 4.
The power cable running into the unit must remain the supplied
flexible cable [not a solid core lighting cable]. If the power cable
becomes damaged, it must be replaced by EnviroVent, an authorised
service agent for your region/country, or a similarly qualified person in
order to avoid a hazard. Do not remove or tamper with any electronic
components inside the unit.
All wiring must comply with Building Regulations and the current
IET Wiring Regulations (BS7671 in the UK) or equivalent standards for
other countries. The final installation should be examined and tested
by a qualified electrician.
The unit is considered to be suitable for use in countries having a
warm, damp equable climate. It may also be used in other countries.
Electrical power is to be supplied to the unit through a residual
current device (RCD) with a rated residual operating current not
exceeding 30mA.
This ventilation unit is for indoor installation only.

MEV Spider
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Diagrams
Overall unit
dimensions
and minimum
area required
for access/
maintenance.
646400
440440
357357
557557
698698
191988
The extract spigots are compatible with ø100mm duct.
The spigot to atmosphere is compatible with ø125mm duct.
ø125mm (x1)
ø100mm (x9)

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Wiring
The local isolator must be connected to the mains as
part of the fixed wiring. Connect the cores of the power
cable to the matching terminals on the local isolator
(3A fuse spur or similar).
The black switch live core of the mains cable can be
wired to a switch input such as the supplied boost
switch or a light switch. When the switch is turned
on, the boost function is engaged. When the switch is
turned off, the unit will return to normal running mode.
In this configuration a triple pole isolator must be used.
MEV UNIT LOCAL ISOLATOR
LN
L
N
MAINS SUPPLY
(230V 50/60Hz)
POWER CABLE
SWITCH LIVE
(OPTIONAL)
Ls
Ls
BLUE
GREEN & YELLOW
BROWN
BLACK
BLUE
GREEN & YELLOW
BROWN

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About the MEV Spider
The EnviroVent MEV Spider is a continuous mechanical extract
ventilation system designed to help create a fresh and healthy living
environment by drawing moist, stale air out of wet rooms, while
minimising the migration of humidity to other rooms.
The unit is normally fitted in a central location such as a hallway
cupboard, with ductwork running from the unit to the kitchen,
bathroom, en-suite, utility and other wet zones. The unit includes up
to nine possible extract spigot positions in order to extract air from
multiple locations.
The unit is suitable for houses, apartments, and communal properties
with a kitchen and up to 6 additional wet rooms. The unit is capable
of delivering a maximum airflow of 129l/s (465m3/h) and a maximum
system pressure of 450Pa. The unit is also covered by a five year
warranty.
The unit will help create a fresh, healthy living environment by
extracting moist stale air from the wet rooms, prevent condensation
and mould within the property.
The Intellitrac® humidity tracking function monitors the humidity
levels in the extracted air and will automatically increase the air flow
rate when the humidity levels rise. Once the humidity levels are lower
the air flow rates will return to the normal rate.
The MEV Spider includes a switch live function. The unit will enter
boost mode whenever the switch live input is engaged.

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Box Contents
• 1 x MEV Spider unit
• 3 x ø100mm Spigots
• 1 x Spigot blank cap
• 1 x User guide
• 4 x Screws 8g x 2.0”
• 4 x Steel washers
• 4 x Plasterboard plugs
• 8 x Adhesive foam pads
• 4 x Rubber sleeves
• 1 x Wireless remote control (MEVS-W units only)
• 1 x Wired boost switch (MEVS-H units only)
Pre-installation checklist
• Does the unit fit in the space where it will be installed?
• Is there room to connect ducts to the spigots without tight duct bends?
• Are there any obstructions above or below the locations where the
extract valves are to be fitted?
• Is the mounting surface strong enough to support the unit?
• Is the mounting surface level?

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Installation
1. Hold the unit up to the chosen location (wall, floor or ceiling) and
ensure there is space for ducts and maintenance access.
2. Use the unit as a guide to mark the 4 fixing holes. Then remove
the unit and drill the fixings holes and insert a plasterboard plug into
each hole.
3. Insert a rubber sleeve into each of the four fixing points at the
corners of the unit. Then stick an adhesive foam pad above and
below each hole.
4. Use an 8g x 2.0” screw and a steel washer to attach each of the
four fixing points to the mounting surface. Do not over tighten the
fixing assembly.
1 2
3 4
CEILING
FLOOR
WALL

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5
67
5. Select up to three 100mm extract spigot locations. If more than
three are required you will need to order extra spigots (see spares on
page 16). Slice around the edge of the chosen positions with a sharp
knife then knock out the blanks with a light tap and discard them. It
may be necessary to remove excess material with the knife.
6. If a spigot hole is removed in error use the spare blank provided to
cover the hole and glue it in place.
7. Push then twist a spigot into each of the cut holes and secure it to the
unit through the two screw holes with the self-tapping screws provided.
8. Ducts must be attached securely to the unit. For maximum
performance use rigid duct and a short length of flexible duct
(300mm) for final connections to the unit and the extract valves.

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9. Fit a suitable low resistance external extract termination (e.g. a
roof vent or fixed louvre grille).
10. Fit adjustable extract valves in the chosen room locations.
11. Fit Ø125mm duct between the external termination and the MEV
unit. Fit Ø100mm duct between the extract valves and the MEV unit.
910
11
Extract
termination
Extract 1
Extract 2 Extract 3
Ductwork should be fitted in
accordance with the Domestic
Ventilation Compliance Guide and
follow any system designs that have
been produced for the property.
Ductwork to atmosphere or through
unheated spaces needs to be
insulated.
For efficiency, all ductwork should
be as large a diameter as possible
(internal spigots 100mm minimum,
external spigot 125mm minimum)
EnviroVent recommend fitting inline
filters to the extract valves.

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12. With the mains supply isolated, wire the unit to the local isolator
as per the wiring diagram on page 4 and in accordance with the local
wiring regulations. When the power is turned on, air will begin flowing
through the system after a few seconds.
13. To commission the unit and change settings, remove the four
lid screws. A keypad is located underneath the lid on top of the
motor plate.
13

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Commissioning
All maintenance and building works should be complete before
commissioning this MEV unit. This will avoid any major disturbance
to the installation or high volumes of dust or debris being drawn into
the system. Do not commission the MEV unit until it is fully installed
including power, ductwork, internal valves and external vents.
MEV systems must be commissioned in accordance with Approved
Document F of the Building Regulations for England and Wales. Further
good practice and advice for the installation of MEV systems can be
found in the latest edition of the Domestic Ventilation Compliance
Guide for England and Wales. For MEV commissioning guidance in
other countries, please refer to the relevant local Building Regulations
for that country.
• Determine the required ventilation rates. For guidance see Approved
Document F of the building regulations for England and Wales.
• During normal running mode, press the SET button for 4 seconds
to enter commissioning mode. (Humidity sensor input is disabled
temporarily while the unit is in commissioning mode).
• LED’s B C D will light and LED A will flash, indicating that the extract
boost flow rate is being modified.
• Fully open all extract valves then measure the air flow rate at all
system extract points using a calibrated air flow meter capable of
measuring in l/s or m3/hr.
• Add the extract rates from all rooms together then compare this
value to the calculated whole building (boost) extract ventilation rate.

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• Use the + and - buttons to increase or decrease the flow rate in
order to meet the calculated whole building extract ventilation
rate. (See Approved Document F). When maximum speed setting is
reached, the LED will flash fast. When the minimum speed setting is
reached, the LED will flash slowly.
• Now adjust the individual valves to extract at the appropriate rate
for each wet room. (Once this step has been completed it may be
necessary to adjust the unit boost rate again to account for any
increase in pressure). Then lock the valves in position.
• Press the SET button once to move on to the extract trickle flow
rate. LED’s A C D will light and LED B will flash indicating that the
extract trickle flow rate is being modified.
• Again use the + and - buttons to increase or decrease the flow rate
in order to meet the calculated whole building (trickle) ventilation
rate. (See approved document F).
• When commissioning is complete for the boost and trickle flow
rates, press SET for 4 seconds to return to normal running mode. If
this is not done, the unit will automatically return to normal running
mode after 60 minutes of inactivity.
Humidity Function
The MEV Spider operates at a continuous normal air flow rate setting.
The unit fan speed will increase if the unit detects a rise in humidity
levels in the property.

MEV Spider
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Wired Boost Switch (MEVS-H only)
The wired boost switch can be pressed to manually activate boost
mode. Turn the switch off to deactivate the boost mode.
Wired Switch Live Boost (MEVS-H and MEVS-W)
The Switch Live Boost switch (this might be a bathroom light switch)
can be pressed to manually activate boost mode. Turn the switch off
to deactivate the boost mode.
Wireless Remote Control (MEVS-W only)
• To manually activate the boost function:
• Press the button once.
• The green LED will light up and the unit will enter boost mode for 20
minutes then automatically return to normal mode.
• To manually deactivate the boost mode, repeat the above steps.
• If the switch live connection is turned on then boost cannot be
cancelled until the switch live connection is turned off.
Red LED
Green LED
Remote control button

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• Pairing an extra remote-control:
• Turn the unit off at the isolation point.
• Restore the power to the unit. For 20 seconds from restarting, the
unit will be in pairing mode.
• Press the button on the new remote control once within the 20
seconds and the remote control will pair to the unit.
• If the pairing has succeeded the green LED will light up.
• Replacing the remote-control battery:
• Undo the two screws and remove the rear casing.
• The battery is located behind the front cover. The remote control
requires 1 x CR2032 battery.
• Replace the battery ensuring the correct polarity then replace the
rear cover and screws. The switch will remain paired with the unit
after battery replacement.
• Dispose of the old battery in a safe manner.

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Technical specification
Extract spigot diameter 100mm
External spigot diameter 125mm
Maximum air flow rate 129l/s (465m3/h)
Maximum power consumption 70W
Electrical Supply 230V Single Phase 50Hz
Ingress protection rating IPX2
Boxed weight 5.8kg
Unboxed weight 4.3kg
Airflow performance

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Post-installation checklist
• Installation instructions have been understood. Contact EnviroVent on
01423 859 395 if you require further technical help.
• Ductwork travelling through unheated areas has been insulated.
• Ductwork diameter from extract points to the unit is 100mm or larger
throughout the installation.
• Ductwork diameter from the unit to the atmosphere is 125mm or larger
throughout the installation.
• Minimal amounts of flexible duct have been used in the installation.
• All ducts, valves and vents are connected, mechanically fixed and sealed.
• The unit is securely fixed with adequate space left for maintenance.
• All major building works have been completed prior to commissioning.
• Air flow rates have been commissioned with a calibrated anemometer or
other suitable piece of equipment to meet Approved Document F of the
Building Regulations for England & Wales.
• Commissioning air flow rate data has been recorded.
• The occupants of the property are familiarised with the operation and
maintenance requirements of the system.
Spares/Accessories
Item Description Order Code
100mm white extract valve 1DIFEXTRACT100WH
100mm extract valve filter 1AC FILTERCONE 100
Spare Remote Control SWH-W
Spare 100mm spigot SPIGOT
Connector for 90mm & 75mm semi-rigid duct CONNECTOR100MM-W&M

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Maintenance
• There is no requirement for maintenance other than cleaning during the
five-year warranty period.
• Before cleaning, isolate the unit from the mains supply then undo the
four screws and remove the lid (as in installation step 13).
• Now undo the motor plate screws and lift the motor plate assembly
backwards then out of the unit. The power cable will remain attached
between the two sections.
• Remove any dust and debris from the inside of the unit then replace the
motor plate and four screws and the lid and four screws.
• Dust and debris should also be removed periodically from any extract
valve filters that are fitted to ensure they do not become blocked.

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Warranty
We appreciate you choosing this quality EnviroVent product, which is designed
and manufactured in Harrogate, North Yorkshire. We are confident 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.
The MEVS unit is covered by a five year warranty, subject to the specified
maintenance stated within this instruction guide.
If your fan has been supplied and installed by EnviroVent it is covered with a
full parts and labour warranty. If you detect a fault, please contact us on
01423 859 395. You will be given guidance over the phone, or an
arrangement may be made for a member of our team to visit (call-out
charges may apply if a fault cannot be identified).
If your fan has been supplied by EnviroVent and installed by a third party,
it is covered by a parts only warranty. If you detect a fault and the product
has been installed in accordance to the fitting/wiring instructions, relevant
guidance documents and by a competent and qualified person (proof
may be required), please return the product to the place of purchase for a
replacement.
Warranty Conditions & Exclusions
Please note that a receipt will be required as proof of purchase. Fans bought
from an unapproved source, including but not limited to auction websites,
are not covered by the warranty. 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
authorized by EnviroVent, or if it has operated in a way which contradicts this
instruction guide. The warranty does not cover accidental damage, misuse or
abuse. The warranty is in addition to your statutory or legal rights.
Your unit serial number
For warranty conditions and exclusions, visit www.envirovent.com/warranty

EnviroVent Limited
EnviroVent House
Hornbeam Business Park
Harrogate
HG2 8PA
T / 01423 810 810
E / [e-mail]
W / envirovent.com
E&OE | MKT ENV230-10.06.20-V4
Due to our policy of continuous innovation
and improvement EnviroVent reserves the
right to alter products specification and
appearance without notice.
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products, services, and overall customer experience. Please email
us to help us serve you better: [e-mail]
Leading Manufacturer & Supplier of
Innovative & Sustainable Ventilation Systems
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Boxed unit weight:
5.8kg
Unboxed unit weight:
4.3 kg
INSTGUIDE-MEVS