Download iMEV Installation Guide - Passivent

iMEV
TM
INSTALLATION GUIDANCE
March 2011
Issue 1

Installation
Design Considerations
Passivent iMEV intelligent mechanical extract
ventilation uses a centrally located fan to
extract air from wet rooms within the dwelling to
the outside atmosphere. Passivent iMEV uses
a humidity sensitive switch located on the fan
unit to recognise the presence of humidity. The
fan unit is constant running providing ventilation
at all times.
To ensure proper and efficient operation the
following points should be adhered to:
• Ducting, when passing through unheated
space, should be insulated
• Fan should be placed to allow access for
maintenance if required
• Any electrical work should be conducted by a
competent person qualified to do so.
• Mechanical systems should be
commissioned when installed whereby flow
rates are measured and recorded.
• Where ducts pass through fire barriers, they
must be appropriately fire stopped in
accordance with the requirements of Part B
of the Building Regulations (Fire Safety).
• It is suggested that flexible ducts are
supported at intervals not exceeding 600mm.
• Where ducting is to be installed within areas
which will make access difficult once
installed, consideration should be given to
using a permanent fixing method. Use of a
non-setting sealant could provide permanent
fixing. Duct tape may not give a reliable joint
over the lifetime of the building.
Warranty
Passivent provide a 2 year warranty for the
performance of the system, provided that it is
installed, commissioned and maintained in
accordance with the instructions contained
within this guide.
The warranty does not cover:
• Disassembly and assembly costs
• Faults which are, in the opinion of
Passivent, caused by incorrect treatment,
negligence or an accident.
• Faults that have been caused by repairs or
intended repairs by third parties without
authorisation from Passivent.
Liability
Passivent is not liable for any damages caused
by:
• Improper use
• Normal wear and tear
• Not following the instructions in this manual
concerning safety, operation and/or
maintenance
• The use of parts which have not been
supplied by Passivent
General
This document describes in full the installation
procedures and good practice which should be
adhered to when installing Passivent iMEV
systems
The installation guide should be read in
conjunction with project specific design
drawings and method statements.
Care should be taken to ensure that the user
fully understands the instruction and
recommendations given within prior to
commencement. Should any instruction not be
clear, contact Passivent Technical Office on
0161 905 5700.
Although this installation guide is deemed
correct at the time of print, Passivent Ltd
reserve the right to amend the information at
any point, and will accept no responsibility for
errors, omissions or misinterpretation of the
information contained within.
Compliance with Building Regulations
It is the responsibility of the systems designer to
ensure that the design of the system complies
to Building Regulation requirements. This
installation guide does not imply that Building
Regulations have been met. It is the
responsibility of a Building Inspector or Building
Control to confirm that the work complies with
Building Regulation requirements.
In order to comply with regulations, mechanical
extract ventilation systems require a level of
background ventilation to ensure flow of fresh
air in to the building. Refer to the necessary
Building Regulations for guidance.

Installation
Safety Considerations
DO NOT install this product in areas where the
following may be present or occur:
• Excessive oil or a grease laden
atmosphere.
• Corrosive or flammable gases, liquids
or vapours.
• Exposure to the weather (rain, sun etc)
• Sudden ductwork bends or
transformations close to the Unit.
Warning
• Do not use this appliance for functions
other than those described in this
manual
• After removing the appliance from its
packaging, ensure that it is complete
and undamaged. If in doubt contact
Passivent Ltd.
• Do not leave the packaging within reach
of children.
• When using any electrical appliance
certain rules should be observed
a) Never handle appliance with wet or
damp hands
b) Never handle appliances while
barefoot.
Caution
• Ensure that the mains supply (voltage,
frequency, and phase) complies with
the fan’s rating label.
• Ensure that the fan exhaust discharges
into an exhaust duct that is dedicated to
this product and is routed to the outside.
via an appropriate terminal
• Do Not discharge, the fan exhaust into
the flue of a; room heater, water heater,
open fire, household boiler, soil vent
pipe (SVP) etc.
• When the fan extracts air from a room
containing an open flue of a gas or fuel
burning appliance, precautions must be
taken to avoid the back-flow of gases
into the room.
• The fan should not be used where it is
liable to be subjected to direct water
spray.
Safety Instructions
All electrical connections should be undertaken
by a qualified electrician and conform to current
IEE regulations.
Ensure that the mains supply (voltage,
frequency, and phase) complies with the fan’s
rating label.
The fan unit (A151DC) must be connected to a
230V AC electrical supply. Note: The fan unit is
double insulated and does not require an earth
connection.
The fan has moving parts, when handling the
unit it should be isolated from the power supply.
It should be left for 30 seconds before opening
the unit to allow the fan to stop rotating.

Installation
Locating the Fan
The fan can be installed in many configurations,
it can be fixed either on the wall, in a cupboard,
under the ceiling or in attic. This will be
determined at the design stage.
Fan location
• The location of the fan unit should
minimise overall duct run length, both
from the internal extract terminals/grilles
to the fan unit and from the fan unit to
the external discharge terminal
• If at all possible avoid placing a fan
adjacent to or over a bedroom
• Do not install where obstructions would
prevent or hinder the access or removal
of the unit.
• The fan unit should be installed to allow
sufficient space for replacement at the
end of its operational life and this should
be achievable without the need to
remove fixed structures or remove
significant lengths of connected duct
work.
Fixing Options
• Suspended mount
This option can be used when fan is installed
within the loft space. The suspended fixing
reduces potential noise due to vibrations.
Suspend fan on nylon suspension cord supplied
(45kg breaking strain) to minimise the transfer
of vibration to the building fabric.
Suspend the fan from suitable anchor points,
that are capable of supporting the weight of the
fan and associated ductwork. To be determined
by installer.
Tie a sturdy knot in the nylon cord around each
lug on the fan unit (denoted on drawing).
Connect the loose end of each nylon cord to the
pre-determined anchorage point by again tying
a suitable knot. Once installed the fan should
sit level.
• Base mounted
This option can be used where there is no loft
space available or user would like to have easy
access. Often fitted in to storage cupboards.
The fan unit should be installed on a suitable
sound structure, which is stable and level. It is
not required to permanently fix the fan unit, but
ample space should be allowed for correct
running of ductwork.
• Wall or Ceiling Mounted
This option can be used when fitting in to
closets or utility areas, where loft space is not
available or practical.
Separate the fan
compartment from the
plenum chamber by
removing the 4 clips (as
shown) holding the 2 parts
together.
Moulded in to the
plenum chamber are
3 denoted fixing
points. Punch or drill
out these pieces
using a suitable drill
bit to accept the
desired fixing used to secure against the wall or
ceiling. To prevent noise due to vibration it is
recommended that between the back of the
plenum chamber and the fixing surface, an antivibration
mat is used. Secure to the structure
by using a suitable fixing. It is the responsibility
of the installer to ensure that the fixing surface
is of sufficient strength to support the weight of
the unit and assembled components.

Installation
Wiring the fan
The A151DC comes complete with a humidistat
controller. This is required to be connected and
installed on to the fan.
Locate the control box which comes mounted
on to the fan unit. Remove the top cover plate,
held in place by 4 1/4 turn screws.
Inside there is a PCB (Printed Circuit Board)
with 2 potentiometers to allow control of air flow
rates of the fan. The PCB board is wired, and
connected to the junction box, located on the
top of the fan. See image.
Control box
Should for some reason the wiring for the
junction box come loose, below is the wiring
layout, denoting the correct connection between
the PCB and the junction box.
The fan unit is double insulated so does not
require earthing. The electrical supply is
connected via a double pole isolating switch
having a contact separation gap of at least 3mm
protected with a 3amp fuse.
Orange
Yellow
SC ST
Brown
Black
0v
DC
Yellow
Grey
10v
DC
Green
Green
24v
DC
Black
Red
48v
DC
Red
Humidity Controller
Brown
Blue
L N
L N
Fan unit
Terminal
block
Double Pole
Isolator
230V 50Hz
Junction box
Duct connections to fan
The fan has 4 no. 125mm diameter spigot
connectors (a) on the plenum box, sealed with
removable blanking plugs (b). Remove the
blanking plugs from the spigots that are to be
used, before connecting the ductwork.
b
To remove simply pull
the blanking plug (b)
from the duct
connector (a). To reinstall
the blanking
plug, simply push fit in
place. The blanking
plugs should remain in
unused spigots .
The fan is supplied with a 125mm to 150mm
diameter adaptor connector. This should be
fitted onto the exhaust spigot of the fan to allow
the connection of a 150mm diameter exhaust
duct for Passivent roof terminals and certain
wall terminals.
Configure the duct connections so that the fan
can be easily removed for maintenance or
replacement at the end of its serviceable life.
Installing the Extract
a
The A121 extract is
supplied assembled. To
install, release the three
clips around the outside
of the facia, connecting it
to the back plate. Then
simply pull the facia and
back plate apart.
To install, fix the back
plate against the ceiling,
using suitable screws.
They should be installed
through the denoted
fixing holes incorporated
in to the plate.
Once the back plate is
installed, simply push fit
the facia on, aligning
the locating void on the
facia and the locating
tab on the back plate.

Installation
Installing the Extract to flexible ducting
Run the ducting down so
it meets the spigot on the
backside of the preinstalled
extract. Ensure
the ducting fully covers
the spigot. The ducting
should be fully extended
so that it does not sag or
wrinkle. Tape the ducting
in place and secure with a
speed clamp fixing.
Hold the ducting securely in place by using the
speed clamp provided. Tighten the clamp by
turning the locking screw.
When using flexible duct, it should be pulled
taught to ensure full diameter is achieved. This
considered to have been achieved when the
duct is extended to 90% of its maximum length.
Installing the Extract to Rigid Ducting
Place the section of ductwork
on to the spigot on
the backside of the preinstalled
extract. Push
firmly together to ensure
the rubber seal attached
to the spigot creates a
seal between the spigot
and the ducting. Tape the
joint.
Installing a Wall Mounted Extract
When installing an iMEV system which uses a
wall mounted extract, it is required to use a
Round Pipe (FCA 11) in conjunction with a Flat
Channel Elbow Connector (FCA 10).
Connect the Round Pipe to the spigot on the
rear of the extract.
Push fit together to ensure the rubber seal
attached to the spigot creates a seal between
the two connecting parts. Next, push fit the
Round Pipe over the spigot on the Flat Channel
Elbow Connector. Tape the joint between the
Round Pipe and the Flat Channel Elbow
Connector ensuring that the joint sits centrally
across the width of the tape.
Connecting Flexible Ducting
Fully extend the ducting
and in to the connecting
end, insert one end of the
sleeve coupling piece.
Place over this overlap, a
speed clamp and tighten.
Connect the other piece of
ducting to the free end of
the sleeve coupling piece
and repeat the process of
locating and securing a
speed clamp in to position.
Connecting Flat Channel Ducting
Push fit the flat channel
ducting (FCD1) in to the
Flat channel circular adaptor
(FCA6) ensuring they
are pushed firmly together.
Tape the joint ensuring it is
central across the tape
width.
Connecting Flat Channel to Insulated Duct
Connect the Flat Channel
Circular Adaptor to the
Insulated Ducting by using
a Flat Channel Circular
Adaptor. Use the adaptor
to join the 2 circular
opening. Push the
Connector in to the Adaptor
end until the ridge around
the connector meets the
edge of the adaptor. Tape
the joint ensuring that it sits
centrally across the width of the tape.
Extend the insulated duct and slide over the
open end of the connector piece. Secure in
place by using a speed clamp ensuring that the
ducting is compressed against the connector
piece.

Installation
Connecting Rigid Ducting
In order to connect 2
pieces of rigid ducting, a
flat channel connector
piece is used. Slide the
connector sleeve over the
end of one of the ducting.
Push fit the 2 joining
pieces together, and slide
the sleeve connector over
the joint. The connector
should be located so that
the meeting pieces of the
flat channel is central inside the sleeve.
Tape both ends of the connector sleeve where it
meets either piece of the joining ducting.
Installing the Tile Terminal
Where penetrating the fabric of the building,
care should be taken to maintain the air
tightness performance of the building fabric.
This could require sealing any air tightness layer
against the terminal ensuring continuity.
Follow specific installation details provided with
slate or tile vent (as desired) on how to correctly
install terminals. Only Passivent supplied
terminals validate the BBA approval on the
system, showing conformity to Building
Regulation requirements.

Commissioning
Setting the Ventilation Rates
Before commissioning the valves on system the
fan speed should be set to achieve the desired
continuous flow speed.
Locate the humidity control box, which is
mounted on the side of the fan housing, and
remove the top cover. This is held in place by
4no. 1/4 turn screws.
Inside the control box is a PCB which incorporates
2no, potentiometers for setting fan speed
and humidity sensitivity.
Gently turn the adjuster on the right hand pot
labelled ‘SET’ fully clockwise.
The fan speed can now be adjusted to suit the
required background airflow by
gently turning the adjuster on the LH pot labelled
‘MIN’.
The fan speed should be adjusted until each
extract is drawing 1.75 times the actual required
flow rate. i.e. If actual flow required is 30m3/
hour at each room extract – set fan speed to
deliver 52.5m3/ hour at each extract. Extract
rate is measured through the use of air flow
equipment such as a vane anemometer .
Once the fan speed has been finally adjusted,
turn the adjuster on the ‘SET’ pot anti-clockwise
back to the central position. (This controls humidity
set point for the automatic boost and can
be re-adjusted later if necessary).
Replace the cover on the box and re-tighten the
1/4 turn screws. Refit the damper flaps
previously removed from the room extracts. To
do this, insert the flap into the opening and line
up the pivot arms on the mounting points. Make
sure the pivot arm enters the mouth of the control
carriage for the sensor strip and gently
push until it clicks into place. Finally, refit the
cover and grille assembly to the extracts.
Commissioning
A supplementary commissioning sheet is
available from Passivent for the recording of
each installation.
The procedures involved within the commissioning
of systems are:
• Visual Inspection
- Inspect all visible duct work to ensure is
not damaged and is properly installed
• Start up of Fan Unit
- Ensure that air flow direction is correct
(i.e. Drawn out of room)
- Listen out for abnormal noises
• Measurement
- Check that correct amount of background
ventilation is present (as required by
Building regulations AD F1:2010).
- Ensure that back ground ventilators are
open
- Ensure all doors and windows are closed
including in rooms in which measurements
are being taken
- Measurement of air flow rates (in l/s) per
room using calibrated air flow device.
- Record measured air flow rate and
designed air flow rate on commissioning
sheet.
• Controls
- Ensure humidity controlled extracts are
installed
- Check humidity controller on fan unit is
wired correctly as per wiring diagram
• Test
- If practical to do so, test the system to
ensure operation