Envirovent MEV 160 User manual

MEV 160 & MEV 300
INSTALLATION GUIDE
AFTER INSTALLATION THE END USER SHOULD
KEEP THIS GUIDE FOR FUTURE REFERENCE
DO NOT THROW AWAY

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SAFETY
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. The unit should
not be installed in wet rooms.
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.
ELECTRICAL CONNECTION
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 requires a continuous electrical power
supply. Connection to the fixed wiring must be made outside the unit in a suitable location.
The unit must be able to be disconnected from the mains supply after installation. The unit
must be earthed and a double pole switch with minimum contact separation of 3.0mm must
be used to provide isolation for the unit (see the wiring diagram on page 2). The power supply
cable running into the unit must remain the supplied flexible cable (not a solid core twin and
earth cable). If the power supply 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 product.

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WIRING DIAGRAM
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 a room
light switch, when the switch is turned on, the boost function is engaged. When the switch
is turned off, the unit will turn to normal running mode. In this configuration a suitable triple
pole isolator must be used in line with the local wiring.
Standard units can be connected to the supplied hard wired boost switch via the black two
core cable labelled “volt free input”. See installation step 12.
Wireless units can be connected to a 0-10V input device via the terminal block at the end
of the black cable inside the unit. See installation step 11.
Do not connect the black boost switch cable or the black 0-10V input cables to the
mains power supply.
DIAGRAMS
VOLT FREE INPUT
(STANDARD UNITS ONLY)
HARDWIRED
BOOST SWITCH
(STANDARD UNITS ONLY)
0-10V CONTROL
INPUT DEVICE
(OPTIONAL)
BOOST
(RED) (BLACK)
(RED) (BLACK)
Cable block location
for 0-10V input.

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ø125
Spigot packs for
ø125mm rigid duct
or ø90/75mm Fast Track
FRONT COVER
ACCESS AREA
CONTROLS
ACCESS AREA
COVER SCREWS
ACCESS AREA
150
COVER SCREWS
ACCESS AREA
150
150
INTERNAL ACCESS (for cleaning or maintenance)
DIMENSIONS
1. Isolate the unit from the mains power supply.
2. Undo all four screws around the front cover and then use a flat head screwdriver to lift the three
clips along the edge of the unit.
3. Now gently pull the cover away from the unit.
DIAGRAMS

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CONTROL PANEL
To access the control panel,
unclip the cap using a small
flat head screwdriver.
DIAGRAMS

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ABOUT THE MEV 160 AND MEV 300
The EnviroVent MEV 160 and MEV 300 are continuous mechanical extract ventilation systems
designed to help create a fresh and healthy living environment by drawing humid, stale air out of
wet rooms, while minimising the movement of humidity to other rooms.
The units are normally fitted in a central location, with ductwork running from the unit to the kitchen,
bathroom, en-suite, utility and other wet zones. The unit provides six possible spigot positions in
order to extract air from multiple locations.
The MEV 160 unit is capable of delivering a maximum airflow of 75 l/s (270 m3/hr) and a maximum
system pressure of 573Pa.
The MEV 300 unit is capable of delivering a maximum airflow of 103 l/s (370 m3/hr) and a maximum
system pressure of 650Pa.
The Intellitrac®humidity tracking function monitors the humidity levels in the extracted air and will
automatically increase the air flow rate when humidity levels rise. Once the humidity levels are
lower, the air flow rate will return to the programmed trickle setting.
The MEV 160 and MEV 300 include a switch live function and if used, will enter boost mode whenever
a switch live input is engaged.
The MEV 160 and MEV 300 come with either a wired boost switch or wireless remote control.
All MEV 160 and MEV 300 units are covered by a two year warranty.

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BOX CONTENTS
Item Description Quantity
MEV 160 or 300 unit 1
Instruction Guide 1
Wireless Remote Control
(Remote Control units only) 1
Wired Boost Switch
(standard units only)1
Spigot packs
(125mm duct or 75/90mm fast track) 3
Screws
(8g x 2.0”) 4
Wall plugs 4
Foam pads 4
Rubber bushings 4
M5 Washers 4
PRE-INSTALLATION CHECKLIST
• Does the unit and ductwork fit in the space where it will be installed?
• Is there room to connect ducts to the spigots without tight duct bends?
• Are all obstructions cleared in the locations where the extract valves will be fitted?
• Is the mounting surface strong enough to support the unit?
• Is the mounting surface level?

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1. Hold the unit up to the chosen location (wall, floor or ceiling) and ensure there is space for
ducts and maintenance access.
2. Undo all four screws around the front cover and then use a flat head screwdriver to lift the
three clips along the edge of the unit. Now gently pull the cover away from the unit.
3. Select up to 3 of the extract spigot locations to be used. If more than three are required (6 max)
you will need to order extra spigot packs (see spares on page 15).
4. Remove the blanking caps from the chosen positions by twisting them anticlockwise from
inside the unit.
INSTALLATION
1.
3. 4.
2.

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Screw
Washer
Rubber bush
Rear cover
Foam pad
Wall plug
5. Insert spigots into each of the required holes and twist them clockwise until they snap into
position. Then attach the appropriate connector using the centre screw provided. There are two
types of spigot pack available for either 125mm duct or the 90mm Fast Track duct system.
6. Use the unit as a guide to mark the four main corner fixing holes. Four alternative fixing
points are shown in the diagram. These can be used if any of the main corner fixing points are
inaccessible.
At each fixing points - assemble an 8g x 2.0” screw, washer, grommet and foam pad as shown
in the image below. Then tighten the screw.
After all the screws are tightened check the unit is securely fastened to the mounting surface.
Connector pack - Standard (125mm duct)
Connector pack - Fast track (75/90mm)
5.
6.

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7. Fit a suitable low resistance external extract termination e.g. a roof vent or fixed louvre grille.
8. Fit adjustable extract valves in the chosen room locations.
9. Fit duct between the external termination and the MEV unit. Fit your chosen size of duct
between the extract valves and the MEV unit. 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 through unheated spaces needs to be insulated. For
efficiency, all ductwork should be as large a diameter as possible. Envirovent also recommend
fitting cone filters to the extract valves.
INSTALLATION
Extract
termination
Extract 1
Extract 2 Extract 3
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 to the extract valves.
7.
8.

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BOOST
10. With the mains supply isolated, wire the unit to the local isolator following the wiring diagram
on page 2 and in accordance with the local wiring regulations. When the mains supply is
turned on, air will begin flowing through the system after a few seconds.
11. Wireless units can be connected to an AirSens intelligent IAQ sensor (optional extra) or other
0-10V control device to provide control over the fan speed. Connect it to the terminal block at
the end of the black cable labelled “0-10V control input” inside the unit. The cable should enter
the unit through the notch in the power cable entry slot. (See your chosen device instruction
guide for further wiring information).
12. Standard units can be connected to the included hardwired boost switch. Connect the switch
accessory to the black two core cable labelled “volt free input”
13. To commission the unit or change settings, unclip the control panel cap using a flat head
screwdriver. The keypad is located underneath the cap.
Extract 1
Extract 2 Extract 3
10.
12.
11.
13.
LOCAL
ISOLATOR

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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.
• Press the SET button for 4 seconds to enter commissioning mode. (Humidity sensor input is
disabled temporarily while the unit is in commissioning mode).
• LEDs B, C and 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.
• 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. LEDs A, C and 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. The unit will automatically return to normal
running mode after 60 minutes of inactivity.

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HUMIDITY FUNCTION
The MEV 160 and MEV 300 both operate at a continuous trickle air flow rate setting. The fan speed
will increase if a rise in humidity level is detected.
HARDWIRED BOOST SWITCH - (STANDARD UNITS)
Standard units are supplied with a black 2-core cable labelled “volt free input” and hard wired
boost switch accessory. The boost switch can be mounted in your chosen location then
connected to this black cable (see page 2 wiring diagram). This will allow the boost airflow rate to
be enabled manually.
To activate the boost function:
• Move the switch to the on position.
• The unit will enter boost mode until the
switch is returned to the off position.
To deactivate the boost function:
• Move the switch to the off position.
• The unit will return to its normal
running mode.
WIRELESS REMOTE CONTROL - (WIRELESS UNITS)
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.
• If the switch live connection is turned on then boost cannot be cancelled until the switch
live connection is turned off.
• To manually deactivate the boost mode, repeat the above steps.
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.

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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 1x 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.
Red LED
Green LED
Remote control button

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0.00
100.00
200.00
300.00
400.00
500.00
600.00
700.00
0.00 20.00 40.00 60.00 80.00 100.00 120.00
TECHNICAL SPECIFICATION
Extract spigot diameter 125mm
or 75/90mm Fast Track
Exhaust spigot diameter 125mm
MEV160
Maximum air flow rate 75l/s
MEV300
Maximum air flow rate 103l/s
MEV160
Maximum power consumption 43.5W
MEV300
Maximum power consumption 69.5W
Electrical supply 230V Single Phase 50Hz
Ingress protection rating IPX2
Boxed weight 6kg
Unboxed weight 5kg
AIR FLOW PERFORMANCE

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POST-INSTALLATION CHECKLIST
• Installation instructions have been understood.
• Ductwork travelling through unheated areas has been insulated.
• 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.
• 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 familiar with the operation and maintenance requirements
of the system.
SPARES AND ACCESSORIES
Item Description Order Code
125mm white extract valve 1DIFEXTRACT125WH
150mm white extract valve 1DIFEXTRACT150WH
Spare wireless
remote control SWH-W
125mm rigid duct
connector (single) PACKRIGID125
Fast Track 75mm/90mm
semi-rigid duct connector (single) PACKFASTTRACK

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MAINTENANCE
There is no requirement for maintenance other than cleaning during the two year warranty period.
Before cleaning, Isolate the unit from the mains power supply. Undo all four screws around the
front cover and then use a flat head screwdriver to lift the three clips along the edge of the unit.
Now gently pull the cover away from the unit.
Remove any dust and debris from the inside of the unit.
Dust and debris should also be removed periodically from any extract valve filters that are fitted to
ensure they do not become blocked.
ISOLATE MAINS SUPPLY

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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 it has been installed.
This unit is covered by a 2-year warranty. You should not dismantle or remove any parts of the
product other than those instructed in this guide. Tampering with the unit will void the warranty. The
valves should be checked periodically to ensure there is air flowing through the system.
ENVIROVENT SUPPLY & INSTALLATION
If your product has been supplied and installed by EnviroVent Ltd it is covered with a two-year parts
and labour warranty. If you detect a fault, please contact us on 0345 27 27 810. 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).
SUPPLY ONLY
If your product has been supplied by EnviroVent and installed by a third party it is covered by a two-
year 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. Products 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, which in any way contradicts this
installation guide
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 ENV409 - V1 - 25.03.21
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and improvement EnviroVent reserves the
right to alter products specification and
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AFTER COMPLETING INSTALLATION, PASS THIS GUIDE
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Boxed unit weight:
6kg
Unboxed unit weight:
5kg
INSTGUIDE-MEV-160/300