MODEL: BV400 Mechanical Ventilation with Heat Recovery Installation and Commissioning Manual

MODEL: BV400
Part No: 90000312
Mechanical Ventilation with Heat Recovery
Installation and Commissioning Manual
PLEASE RETAIN THESE INSTRUCTIONS WITH THE PRODUCT
INDEX
1. Introduction................................................................................................................ 3
2. General Instructions.................................................................................................. 3
3. Product Description................................................................................................... 5
4. Technical Data............................................................................................................ 6
5. Performance Curve.................................................................................................... 7
6. Sound Curve............................................................................................................... 7
7. Dimensions................................................................................................................. 8
8. Installation.................................................................................................................. 9
9. Operating Connections............................................................................................. 19
10. Maintenance Instructions........................................................................................ 24
11. Accessories.............................................................................................................. 26
12. Troubleshooting....................................................................................................... 27
13. Warranty.................................................................................................................... 28
Page 2 of 28
1. Introduction
Dear Customer,
Thank you for choosing a Duplexvent Basic Line ventilation system.
Please read and follow the instructions in this manual carefully before you start installing your
equipment. In this document you will find instructions for mounting, commissioning and
maintenance which are necessary to operate your unit properly and improve the longevity of
your ventilation system.
This technical guide is intended for professional installers.
If you have any further questions, please contact:
Airflow Developments Limited
Aidelle House, Lancaster Road, Cressex Business Park
High Wycombe, Buckinghamshire, HP12 3QP
United Kingdom
Tel: (Int +44) (UK 0) 1494 560800
Fax: (Int +44) (UK 0) 1494 461073
E-mail: info@airflow.com
Visit: www.airflow.com
Please keep this manual in a place where it is accessible at all times. In case of loss of this
document please refer to the product page on our website.
The manufacturer is not liable for damage caused by unprofessional installation and operation
that is not in compliance with this manual. Failure to follow these instructions may cause the loss
of product warranty.
2. General Instructions
To maintain a healthy indoor environment, closely controlled ventilation is essential. There are
many pollutants that will affect the indoor air quality: biological, dead skin, perspiration and
moisture. Add to this the waste products of cooking (cooking smells), showering (moisture),
gases from building materials and the bi products of pets. Without proper ventilation this would
be the perfect environment for the growth of mould, subsequent damage to the fabric of a home
and to the health of its occupants.
This heat recovery unit is fitted with two, low energy EC fans with balanced (100% adjustable) air
volume. The system operates on the principle of air exchange complying with the energy
utilization regulations according to DIN 1946, which ensures hygienic and sanitary conditions in
the house at the nominal fan speed.
The filters in the unit ensure that the fresh supply air is clean as it enters the home. Also, the
extract air from the property is filtered to protect the heat exchanger from unwanted
contamination. These filters should be maintained depending on the level of pollution and
replaced after a maximum of two cleaning cycles (6 months).
Page 3 of 28
It is important to follow the advice in this manual and correctly maintain the system to
ensure a healthy indoor environment.
2.1 Safety Instructions
Do not install this product in areas where the following may be present or occur:
* Corrosive or flammable gases, liquids, vapours or excessive grease laden
atmosphere.
* Ambient temperatures higher than 40°C and lower than 5°C.
* Possible obstructions that may hinder access to the unit for servicing purposes.
All wiring must be in accordance with the current IEEE wiring regulations. Installations should be
inspected and tested by a suitably qualified person after completion.
All regulations and requirements must be strictly followed to prevent hazards to life and property,
both during and after installation.
Before opening the door of the unit for cleaning, filter replacement or general maintenance
always make sure that the equipment is disconnected from the power supply and prevent its
reconnection by another person.
This appliance should only be used after the user and maintenance manual has been read.
2.2 Installation Instructions
The installer is responsible for the installation and electrical connection of the Duplexvent unit on
site. It is the responsibility of the installer to ensure that the equipment is safely and securely
installed and left in a mechanically and electrically safe condition.
Intended use includes compliance with the user and maintenance instructions provided by
Airflow Developments Ltd. Only qualified persons are permitted to carry out the installation and
commissioning of the unit. In addition, the end user should be handed a copy of these
instructions and shown all the main elements of the complete system on hand over.
When installing the unit, please make sure that the mains supply (voltage, frequency and phase)
complies with the rating label. This unit must be earthed.
This appliance is not suitable for outdoor installation and should not be used for dehumidification purposes. It may only be installed in suitable and temperate indoor conditions.
The condensate drain for the unit should be sited in a frost-free area. If this is not possible the
drain pipe should be insulated to protect against freezing.
If ductwork passes through an unheated area such as loft void or similar location it should be
insulated. The supply and exhaust air must only be vented to the exterior of the property.
If an extract grille associated with the unit is sited in a room containing a fuel burning appliance,
the installer must ensure that air replacement is adequate for both appliances. If there is any
doubt the manufacturer of the fuel burning appliance should be consulted.
Page 4 of 28
2.3 Commissioning and Operating Instructions
This equipment may only be put into operation after the control switch has been properly
installed and connected to the unit.
The supply and exhaust valves must be fully opened prior to commissioning. They should be
positioned a minimum of 300mm from obstacles to enable air flow measuring equipment to fit
correctly over the valve.
The condensate drain and associated pipe work must be clear of any debris prior to
commissioning.
It is recommended that open ended ducts are sealed off and air valves are closed until any
building work is completed in order to stop any ingress of contaminants.
When fitted to a new build property or one that has had recent building work of any kind, the
supply and exhaust filters should be checked at one month intervals for the first six months for
excessive dust build-up.
Certain applications may require the installation of sound attenuation devices to achieve the
sound levels required.
DO NOT switch off the unit – it is designed to run continuously. If the unit is switched off,
indoor pollutants and moisture levels may increase which could endanger your health or
damage your home.
3. Product Description
Duplexvent BV400
Duplexvent BV400 is a ventilation unit with state-of-the-art technology suitable for medium and
large size houses. The unit is designed for continuous 24 hours exhaust ventilation of stale moist
air from bathrooms, toilets and kitchens. As the stale air is extracted, a heat exchanger within the
unit transfers more than 90% of the heat into the supply air entering the bedrooms and lounge
etc.
1
2
5
1
Control Box
2
Extract & Supply Air Filters
3
By-pass Module
4
Heat Exchanger
5
Metal Casing
6
Extract & Supply Air Fans
3
6
4
6
Page 5 of 28
5. Technical Data
Performance
EC Fan Speed settings selected on installation
(Low & High speed levels are 100% adjustable)
Typical Ventilation Settings at 100 Pa
Rated Voltage
Low
Middle
High
Boost
75 m³/hr
200 m³/hr
350 m³/hr
425 m³/hr
3.0 V
5.5 V
8.0 V
10.0 V
Maximum Air Volume (at 0 Pa)
475 m³/hr (132 l/s)
Air Volume (at 100 Pa)
425 m³/hr (118 l/s)
Thermal Efficiency (ref. SAP Appendix Q)
93%
Specific Fan Power (ref. SAP Appendix Q)
0.45 W/l/s
Power
Power Supply
230V / 1PH / 50Hz
Maximum Power Input
180 W
1.54 Amp
Maximum Current
Supply Fuse
3 Amp (for standard unit)
13 Amp (for additional accessories such as heaters)
Physical
Dimensions (W x H x D)
710 x 725 x 630 mm
Weight
41 kg
Filter Class (conforming to EN779)
G4 (F7 optional)
Duct Connection Ø
160 mm
Condensate Discharge Ø
22 mm
Protection Class
IP44
Operation
Operating Temperature
-10°C to +40°C
Operating Humidity
0% to 80% rH
Page 6 of 28
6. Performance Curve
500
450
External Pressure (Pa)
400
350
Low Speed
Medium Speed
High Speed
Boost
300
250
200
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500 550
Air Volume (m³/h)
7. Sound Curve
Octave Sound Pressure Level (dB: Overall A Scale )
dB(A)
60
50
NR50
Low Speed
Medium Speed
High Speed
Boost
40
NR40
30
NR30
NR20
20
NR0
10
63
125
250
NR10
500
1000
2000
4000
8000
Central Frequency (Cycle per Second)
Page 7 of 28
Hz
7. Dimensions
Top View
Front View
160
Rear
475
103
287
630
610
10
725
733
731
116
23
130
710
Front
Service Space
Top View
Front View
Rear
Front
min. 110 mm.
A clear space of 600mm
should be provided in
front of the unit to allow
for servicing.
Clearance for condensate drain
*All dimensions are in mm.
Page 8 of 28
8. Installation
The Duplexvent BV400 is suitable for floor or wall mounting. Units are typically installed in utility
rooms, storage cupboards or similar areas.
When wall mounting, consideration should be made regarding the wall's strength and its
suitability.
When floor mounting, please ensure that there is enough space below the unit to accommodate
the condensate drain.
Take into consideration the position of the electrical equipment and ensure there is adequate
access for installation, operation and maintenance.
The unit should always be mounted vertically with ducting exiting the unit vertically.
Care should be taken when choosing the location of the unit. Although care has been taken in the
design of the unit, some mechanical noise may be transmitted through the unit.
8.1 Selecting The Unit Configuration
The unit is supplied from the factory as a right handed version (see Figure 1). If needed, the unit
can be changed to the left handed version in which the outdoor air enters the unit from the left
hand side when viewed from the front of the unit (see Figure 3).
Installing the unit in the opposite handing involves removing the front door cover and rear cover,
rotating them 180 degrees, and re-attaching them on the opposite sides of the unit ie: The front
cover to the back and the back cover to the front .
Remove the front cover (4 screws) and rear (6 screws) cover by unscrewing the fixing screws.
OA
RA
EA
SA
Fig. 1 Duplexvent BV400
(right handed – standard delivery)
EA
SA
OA
RA
Fig. 2 Removing the front and rear covers
Exhaust air to atmosphere
Supply air to dwelling
Outdoor air from atmosphere
Return air from dwelling
Page 9 of 28
SA
EA
RA
OA
EA
SA
OA
RA
Exhaust air to atmosphere
Supply air to dwelling
Outdoor air from atmosphere
Return air from dwelling
Fig. 3 Duplexvent BV400 (left handed)
8.2 Optional Spigot Installation
The Duplexvent BV400 has a number of options regards positioning of the four entry/exit
spigots. This enables more flexibility when positioning the heat recovery unit and system
ducting. For example connection to the unit from the bottom. The standard unit supplied is
configured for top entry connection.
It is possible to configure the unit for bottom entry connection should space consideration for
connecting duct runs necessitate it.
Spigots OA and RA may be separately (ie: one or both of them) re-located to the bottom of the
unit if required. However, if spigots SA and EA are needed to be moved they must be BOTH
moved and relocated together. If the unit has been modified into a left hand unit (as section 8.1)
then the opposite procedure to the above is necessary.
Relocating spigots RA and OA (if required)
Remove the relevant spigot/s by unscrewing the 4 screws on the top of the unit.
Remove the corresponding blanking cap at the bottom of the unit by unscrewing the 4 screws.
After removing this blanking cap also remove the sealing cap.
Spigot
Sealing Cap
Blanking Cap
Fig. 4 Duplexvent BV400 spigot relocation
Page 10 of 28
Swap the spigot with the relevant removed blanking and sealing caps. Insert the spigot into the
entry/exit hole and secure with the retaining screws. Insert the blanking and sealing cap into the
entry/exit hole and secure with the retaining screws.
OA
EA
EA
SA
RA
EA
SA
SA
EA
SA
OA
RA
OA RA
RA
Exhaust air to atmosphere
Supply air to dwelling
Outdoor air from atmosphere
Return air from dwelling
OA
Fig. 5 Optional OA and RA spigot variations
Note: Always fit the sealing and blanking caps to the entry or exit hole not in use to ensure the
correct air flow into and out of the unit.
Relocating spigots SA and EA (if required)
Remove the relevant spigot/s by unscrewing the 4 screws on the top of the unit.
Remove the corresponding blanking cap at the bottom of the unit by unscrewing the 4 screws.
After removing this blanking cap also remove the sealing cap.
Remove the front cover, bypass module and heat exchanger respectively.
Fig. 6 Remove the front cover, bypass module and heat exchanger
Page 11 of 28
Remove the fan module, rotate it 180° vertically. Re-install the fan module, heat exchanger,
bypass module and front cover respectively.
Control Box
Fan Module
EA
Heat Exchanger
SA
SA
Bypass Module
EA
Front Cover
Fig. 7 Rotate the fan module and re-install it matching air paths EA-SA as shown
Fan Module
Note: Remove the electrical connections of the fans
from the back of fan module (see figure 8).
Re-connect the electrical connections of the fans in
the opposite direction (EA as SA, SA as EA).
Fig. 8 Changing the fan connections
Page 12 of 28
Swap the spigots with the relevant removed blanking and sealing caps. Insert the spigots into
the entry/exit holes and secure with the retaining screws. Insert the blanking and sealing caps
into the entry/exit holes and secure with the retaining screws.
OA
RA
EA
SA
OA
RA
EA
EA
SA
Exhaust air to atmosphere
Supply air to dwelling
Outdoor air from atmosphere
Return air from dwelling
OA
SA
RA
OA
RA
Important Note: You cannot change the
SA and EA spigots separately. Both
spigots must be installed next to each
other, either on the top or at the bottom of
the unit (see Figure 9).
EA
SA
RA
EA
SA OA
Fig. 9 Optional EA and SA spigot variations
Note: Duplexvent BV400 units have spigots suitable for 160mm ducting and have a rubber seal
incorporated to enable leakage-free connection. For the best performance we recommend our
Airflex ISO insulated rigid ducting be used in conjunction with the Airflex PRO semi-rigid ducting
system (details can be found on www.airflow.com).
8.3 Installation
The Duplexvent BV400 should be installed vertically. The unit is suitable for wall or floor
mounting in a position where the temperature does not fall below 5°C.
Please check that the unit is configured correctly and ensure that there is enough space for the
condensation fitting, duct connections and future servicing.
The contents include:
1 x BV400 Ventilation Unit
1 x BV400 Control Switch
1 x User and Maintenance Manual
1 x Installation and Commissioning Manual
2 x Mounting Brackets (for wall or floor installation)
4 x Wall Screws (Ø5 x 40) and 4 x Plugs (Ø7)
8 x Small Screws (M5 x 10-8,8) (for wall installation)
4 x Small Screws (4.8 x 15-8,8) (for floor installation)
2 x Screws (Ø4 x 30) and 2 x Plugs (Ø6) (for control panel)
Page 13 of 28
8.3.1 Wall Mounting
Important Note: Before starting the installation, please ensure that the wall selected is suitable
to withstand the weight of the unit (41 kg).
Note: Incorrect installation may cause excessive noise levels. The unit should ideally be
installed onto a medium density block wall. If the unit is to be mounted onto a stud wall, then it
should be screwed directly onto the studs, using the mounting brackets provided. If space is
limited and it is not possible to screw directly onto the studs, then additional battens should be
fitted to the studs and the unit secured to these battens.
Unit Installation:
Screw the two mounting brackets (supplied) to the rear cover, using the eight small screws
provided (4 along the top bracket and 4 along the bottom bracket) (see Figure 10). Position the
four screws and wall plugs (2 x top, 2 x bottom) in the wall based on the distance between the
holes on the mounting brackets (see Figure 11). If the four screws and wall plugs supplied do not
suit the fabric of the wall, suitable fixings should be provided by the installer.
Fig. 10 Installing mounting brackets
600
Mount the unit on the wall by attaching the unit complete with brackets to the screws on the wall.
Brackets should fit over the screws giving a secure fit between the screw head and the wall.
500
Fig. 11 Wall Installation
Page 14 of 28
8.3.2 Floor Mounting
Note: Before installation please ensure that there is enough space under the unit for the
condensate drain.
Unit Installation:
Remove the base feet (four pieces) from the bottom of the unit.
Install both mounting brackets to the bottom of the unit, using the four small screws (2 along the
right bracket and 2 along the left bracket) before attaching the base feet to the brackets.
The same mounting brackets
are used for installation on the
wall or on the floor
23.08
Fig. 12 Installing mounting brackets
8.4 Condensate Discharge
During the heating season, humidity from extract air condenses in the unit. This should be
drained out of the unit in order to prevent damage to the unit and duct system.
The unit comes complete with a condensate drain fitting on the under side.
min. 110 mm.
Fig. 13 Condensate discharge for wall and floor mounting
Clearance for
condensate drain
Page 15 of 28
A standard 22 mm condensate pipe is suitable for connection to an appropriate drain location.
Please ensure that the drain incorporates a U-bend to prevent air penetration back to the unit.
Care should be taken to ensure that there is enough space to clean the condensate U-bend at a
later date.
The condensate pipe should be installed to have a minimum of 5° fall from the unit.
Fig. 14 Condensate pipe connection
Note: The condensate U-bend should be checked at regular intervals for any blockages and that
there is sufficient water in it. Any condensate pipe installed outside the insulated envelope of the
building should be insulated to protect against freezing.
8.5 Electrical Connections
WARNINGS
Mains supply voltages (230V AC) are present in this
equipment which may cause death or serious injury by
electric shock.
Only a qualified electrician or installer should connect the
power supply to this unit.
Danger
Electric Shock
risk
This unit must be correctly earthed.
To connect the power supply:
Ensure the electric circuit allocated to the unit is securely isolated.
The unit is supplied with a 3 metre long fly lead (3-core x 1.5 mm²) for connection to the power
supply. A switched fused spur should be provided for electrical connection (Fuse Rating: 3 Amp
for standard unit, 13 Amp for unit with heater). This enables the unit to be isolated for service and
maintenance purposes.
Page 16 of 28
8.5.1 Control Switch Mounting
The unit is supplied with a three speed control switch as standard.
The control switch is suitable for surface mounting with the
connecting low voltage cable recessed into the wall
(recommended).
* Channel out the wall to run the cable to the required
location (see Figure 15)
Cable connected
to the MVHR unit
* Drill a hole (15mm diameter x 15mm deep) to recess
the connecting plug in the surface.
* Alternatively, if surface mounting of the connecting
cable (within conduit) is required, there is an optional
cut-out in the top of the controller which allows
surface cable entry.
Control
Switch
* Remove the metal plate from the switch and mount it
on the wall using two screws (supplied).
* Connect the cable to the control panel.
* Fix the control panel to the metal plate using the
screw at the bottom of the switch.
Wall
* The unit is supplied with a 5 metre long cable with
plugs to connect the control switch to unit. (see
wiring diagram).
Fig. 15 Control switch mounting
8.6 Fan Speed Adjustment
Persons commissioning the finished ventilation system are responsible for setting the required
air volume rates which should be set according to the relevant guidelines and approved
documentation by a competent person. This is to ensure correct ventilation rates at the most
economic unit settings.
The low and high speed levels can be adjusted using two potentiometers found on the PCB in
the control box. To increase fan speed turn the potentiometers clockwise.
PCB
Diagram
Potentiometer
for Low Speed
Connection Socket for
Control Switch Cable
Fan speed
potentiometers
Potentiometer
for High Speed
Medium speed will be set automatically
by the controller's software taking the
mid-point of the High and Low fan speed
settings.
Page 17 of 28
A1
A2
L1 L2 L3
R S T
KONT-1
ROTOR
1
0
L
L
N
R
KONT-1
S
T
GND
L1 L2 L3
KONT-2
L1 L2 L3
1
0
400V
3 PHASE
L
L
N
R
KONT-1
S
T
GND
L1 L2 L3
STEP
1
KONT-2
L1 L2 L3
STEP
2
FAN-OA
FAULT
Page 18 of 28
HT
FAULT
RL_2
SENS_2
PANEL
FAN_LOW
N
PE
GRID
CONNECTION
L
1
0
L
N
HT
HT_F
ROTOR
OK
HT/HT_P/BY_P/BMS
RL_1
STD_IN
RL_3
HT_P_FAULT
HT_FAULT
MODBUS
FAN_HIGH
FILTER
MODBUS
N
N
N
L
L1 L2 L3
GND
TACH
0-10V
GND
KONT-2
0-10V
PE
PE
GND
L1 L2 L3
STEP
2
TCH
SUPPLY FAN
L
L
L
KONT-1
GRID
CONNECTION
BASIC CONTROL PANEL
BOOST-AC
BOOST
FIRE
STEP
1
PRE-HEATER ( 2 STEP ) (HT-P)
230V
1 PHASE
1
0
L
N
N
N
N
GND
TACH
L1 L2 L3
TCH
KONT-2
GND
0-10V
0-10V
GND
PE
PE
L
L1 L2 L3
STEP
2
EXHAUST FAN
L
L
L
KONT-1
STEP
1
HEATER ( 2 STEP ) (HT)
230V
1 PHASE
HT_P
PRO CONTROL PANEL
B (GREEN)
HEATER ( 2 STEP ) (HT)
P_HT_F
Outdoor Temperature Extract Temperature
Sensor
Sensor
JST-ELR-02V
JST-SLM-41T-P1.3E
DAMPER MOTOR
TER_OA
TER_RA
B
A
TER_SA
HT_P
GND
12V
DC
SENS_1
MODBUS-USER
FAN_RA
MODBUS
FAN_OA
BY_P
OK
POWER
BMS-FAULT BMS-RUN
STD-IN
NOTE: THE CONNECTIONS SHOWN IN THE BOX OPTIONAL FEATURES.
NC
P_HT_F
POWER
SENSOR-2
NO
HT_P
BMS-OK
COM
FILTER
GRID
CONNECTION
FAN-RA
SENSOR-1
STEP
2
HT_F
L-N-GND
SA
TERMISTOR
STEP
1
HT
A (YELLOW)
400V
3 PHASE
GRID
CONNECTION
GND (WHITE)
GRID
CONNECTION
12V DC (BROWN)
PRE-HEATER ( 2 STEP ) (HT-P)
JST-ELR-06V
JST-SLM-41T-P1.3E
8.7 Wiring Diagram
9. Operating Instructions
Continuous ventilation is necessary to ensure a healthy indoor air quality and to maintain the
building fabric in good condition at all times. Even with prolonged absence of residents (ie.
holiday) it is not recommended to switch off the ventilation unit since indoor contaminants are
still being produced and entering the air, causing the air to get stuffy and a high possibility of
moisture damage due to excess humidity during the heating season.
Do not turn off the device! This is required for protection against moisture in accordance
with DIN 1946 Part 6 and Building Regulations 2010 Approved Document Part F.
The ventilation unit works properly when the flow rates are adjusted in accordance with the
above regulations to ensure optimum ventilation of the house.
Default Factory Settings
Parameters
Settings
Low Speed Supply/Extract
30% (3V)
Medium Speed Supply/Extract
55% (5.5V)
High Speed Supply/Extract
80% (8V)
Boost Speed Supply/Extract*
100% (10V)
Manual Boost Overrun*
15 min
On-demand Boost Delay*
1 min
Filter Timer*
3000 hours
Requested Indoor Temperature*
22°C
Indoor Temperature Selection*
Extract Air Temperature
-3°C
Defrost Temperature*
Defrost Cycle*
15 min
Pre-heater Temperature*
0°C
Note: The low and high speed levels can be adjusted by manual potentiometers. The medium
speed has been set in the controller's software by the manufacturer and is set as the average
value of the manually adjusted low and high speed levels.
* These values are factory set and can only be adjusted via the digital controller (BV400 SE).
Page 19 of 28
9.1 Basic Control Settings
ON/OFF: Press
for 3 seconds.
Press
to increase fan speed.
Press
to decrease fan speed.
Press
to activate the manual
“boost” function.
Child Proof Protection: To activate this function, press
and
simultaneously for 3 seconds.
When child proof protection is active, keypad is locked and buttons do
not work.
To deactivate this function press
and
for 3 seconds.
9.2 Fan Speed Adjustment
The installer is responsible for setting the required air volume rates for every room in compliance
with the Domestic Ventilation Compliance Guide 2010.
The Duplexvent BV400 unit has a 3-speed control switch which is supplied as standard. The low
and high speed levels can be adjusted by manual potentiometers for commissioning purposes.
This can be done through the control box which is located on top of the unit. The medium speed
has been set in the controller's software by the manufacturer and is set as the average value of
the manually adjusted low and high speed levels.
Page 20 of 28
9.3 Other Control Functions
Boost Function
This function is used when large amounts of exhaust and fresh air are required.
There are 2 different boost functions (Manual and On-demand):
a) The Manual Boost function is activated after pressing the “Boost” button on the
control panel
Once activated, the unit runs at the boost speed for 15 minutes.
Note: During the manual boost operation the Low, Medium and High speed LED lights
flash at the same time.
b)The On-demand Boost function is activated via volt-free or switched live contact
(see section 11) on the control board. When activated, the unit starts running at the
“High” speed until it is deactivated and goes back to the speed level that was set
before the boost operation.
2
1
UNIT-OK
UNIT-FAULT UNIT-RUN
Volt-free
connection
for boost
Switched live
connection
for boost
Summer Bypass
The Duplexvent BV400 unit is fitted with a bypass facility as standard. This can be used for
keeping indoor air temperature at a comfortable level.
If the house indoor air temperature is hotter than the unit temperature sensor setting (factory set
at 22°C), with the incoming air temperature lower than the indoor air temperature, the bypass
damper will open. This will tend to lower the indoor air temperature until it reaches the set
temperature level (22°C).
Page 21 of 28
At other times the unit will recover heat as long as the related dip switch in the control box is
activated.
The bypass function is activated from “dip
switch 3” in the control box on top of the
unit.
This can be switched off in the heating
season to have heat recovery at all times.
Frost Protection
In case of very low outside temperatures, the supply fan will reduce its speed automatically for a
short period to protect the heat exchanger from freezing. This function is active when the outdoor
air temperature falls below -3°C.
For uninterrupted air supply and extract volumes in regions with low outside temperatures
(< -5°C for more than 24 hours), an in-line electric pre-heater (see section 11) can be used in the
supply air stream from the outside to the dwelling to avoid the heat exchanger freezing. The
heater automatically switches on when the outdoor air temperature falls below 0°C.
Once installed, the pre-heater control must be activated from “dip switch 2” in the
control box on top of the unit.
Filter Maintenance Indicator
The unit is fitted with a maintenance reminder facility which has been pre-set to 4 months. When
this time interval is reached the red warning light on the control panel flashes for filter
maintenance indication. After cleaning/replacing the filters press the
and
buttons
simultaneously for 3 seconds to reset the timer.
Alternatively, optional pressure sensors (see section 11) can be used to measure the actual
pressure difference between supply and exhaust air hence monitor the filter status. The red
warning light on the control panel flashes as soon as the filters need to be maintained.
After cleaning/replacing the filters, the red warning light goes off automatically.
Electric Post-heater
For most of the year, heat recovered from the extracted air is sufficient to warm the fresh
incoming air to the required temperature. If the heat gain from the extract air is not sufficient an
optional post-heater (see section 11) can be used to increase the indoor air temperature.
The heater is switched on/off automatically based on the extract air temperature in order to
maintain the requested indoor air temperature (factory set at 22°C).
Once installed, the post-heater control must be activated from the “dip switch 1” in
the control box on top of the unit.
Page 22 of 28
Heating Coil Function (Optional)
This function is used in units which have duct type hot water coils. It controls the hot water coil
which helps to increase supply air temperature and works due to set and return air temperature.
It can control 230V on/off valve connected to water coil.
Note: To activate this function, following must be applied:
-Turn electrical heater function on. (Turn dip switch 1 on)
-Make short cut in between HT_Fault and HT_P_Fault inputs.
-Connect 230V on/off valve to 1.step electrical heater control cable ends.
Cooling Coil Function (Optional)
This function is used in units which have duct type cold water coils. It controls the cold water coil
which helps to decrease supply air temperature and works due to set and return air temperature.
It can control 230V on/off valve connected to water coil.
Note: To activate this function, following must be applied:
-Turn electrical heater function on. (Turn dip switch 1 on)
-Activate “Cooling Coil” on unit settings. (This can be done by authorized technical service
or default in factory)
-Make short cut in between HT_Fault and HT_P_Fault inputs.
-Connect 230V on/off valve to 2.step electrical heater control cable ends.
Fire Switch
This volt-free contact can be used to shut down the unit in case of a fire or any other emergency.
2
1
UNIT-OK
UNIT-FAULT UNIT-RUN
A volt-free switch should be connected to
the corresponding socket to activate this function.
MODBUS Control / MODBUS Monitor
The MODBUS (via RS485) BMS control function helps to control the functions from a central
automation system. For more information, please contact our technical support team.
The MODBUS BMS monitoring enables the user to display the operating status of the unit and
receive fault signals (as different voltage outputs) in an unexpected failure of the unit.
This function is activated from “dip switch 4” in the control box on top of the unit.
Page 23 of 28
10. Maintenance Instructions
Heat recovery units, by their very nature, require regular maintenance. The Duplexvent BV400
has been designed to facilitate easy access to enable maintenance to be carried out.
Note: The heat exchanger will be damaged if the unit runs without the filters.
WARNING
THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED
FROM THE POWER SUPPLY DURING MAINTENANCE.
Danger
Electric Shock
risk
10.1 Filter Maintenance
In the Duplexvent BV400, both supply and exhaust air streams are filtered through G4 class
course filters. The filters should always be kept in place when the ventilation unit is in operation.
To prevent the contamination of this ventilation system, to guarantee years of trouble-free
operation and ensure that clean air is supplied into your home the filters must be periodically
cleaned or replaced (depending on contamination of the outdoor air).
Step 1: Slide the service cover to the left, open it and remove the filters.
Slide the
Service Cover Left
Open the
Service Cover
Remove the Filters
Step 2: Use a vacuum cleaner to clean the dust from the air filter. If necessary, use warm water
with detergent to remove the persistent dirt. Leave the filters to dry before placing them
back in the unit.
Vacuum Cleaner
Page 24 of 28
Filter
Note: The G4 filters should be replaced once every six months or after a maximum of two
cleaning cycles. If an optional F7 filter is used please replace these filters after every
maintenance cycle (replacement filters are available on www.airflow.com, see page 15 for part
numbers).
Step 3: Place the filters in the filter slots, close the service cover and slide it to the right to secure.
10.2 Heat Exchanger Maintenance
Approximately every two years it is recommended that the heat exchanger is checked for
contamination. This time scale may vary depending on the surroundings of the property.
Inspection should be carried out when checking the filters.
WARNING
THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED
FROM THE POWER SUPPLY DURING MAINTENANCE.
Danger
Electric Shock
risk
Step 1: Remove the front cover plate and the bypass module by unscrewing the screws.
Step 2: Remove the filters and pull the heat exchanger out gently using the green strap.
Caution: The fins of the heat exchanger are very thin and can easily be damaged.
Page 25 of 28
Step 3: Remove the dirt from the outside walls of the heat exchanger with a vacuum cleaner.
Vacuum Cleaner
Caution: Never use water or any other cleaning materials.
10.3 Other Maintenance Procedures
During maintenance work in autumn please check the condensate drain is secure and not
clogged. This can be tested by pouring some water into the drain pan and checking the water
coming out of the unit through the condensate drain. Clean the drain, if necessary. Also ensure
that the insulation of the condensate pipe is adequate.
Check that the unit and all wall-mount fastenings are sufficiently tight and have not become
loose. Re-tighten if necessary.
11. Accessories
The following accessories for this unit can be ordered from Airflow Developments Ltd:
Part Number
Product Description
90000336
Digital control display
90000322
G4 filter pack (2 filters)
90000323
F7 filter pack (2 filters)
90000228
Boost switch (1-way)
90000324
Electric duct heater (1 kW)
(can be used as pre-heater or post-heater)
9041570
Room humidistat
51969702
PIR Motion sensor
90000325
Built-in humidity sensor
90000326
Pressure sensors for filter monitoring
Mechanical ventilation units require good quality ducting and a high standard of installation.
To ensure the best results, we recommend the innovative AIRFLEX PRO semi-rigid ducting
system.
Page 26 of 28
12. Troubleshooting
Diagnosing a Problem
In the event of a problem, always troubleshoot the unit according to LED fault.
There are two types of warnings displayed on the control switch:
a) Red LED flashes on/off: Filter Maintenance Alert
b) Red LED flashes continuously: Failure of Components (Fans,
Sensors, Heaters)
If no indications are displayed, then troubleshoot the problem according to
the fault symptom as described in the table below:
Failure
Reason
Outdoor air coming into * Air cools down in the attic ducts
the dwelling is cold
* The heat exchanger is frozen which is why
extract air cannot heat the incoming air
* The extract fan is not running
* The extract air filter or the heat exchanger
is clogged
The unit has been
switched off
unexpectedly
* Mains voltage failure
The unit makes a lot of
noise
Gurgling noise
* Condensate trap water level is too low
* Condensate pipe is not completely in the
trap
* Condensate pipe or condensate trap is
blocked or frozen
Rumbling/Rattling noise
* Fan motor fault
Solution
Check the duct insulation
If the heat exchanger is frozen
contact your supplier/installer to
reduce the set point of the frost
protection facility
Contact your supplier/installer
Check that the filters and the heat
exchanger are clean
Consult a qualified electrician to
check mains power supply to
units.
Fill the condensate trap with water
Push the pipe deeper into the trap
Check the condensate drain and
clean it, if necessary
Contact your supplier/installer
Water leakage near the * Condensate trap is clogged or frozen
* Condensate pipe has come loose
unit
Check the condensate drain and
clean it, if necessary
Unpleasant smell near
the unit
* Condensate trap (U-bend) below the unit
is empty
* The condensate pipe is not completely in
the trap
* The condensate pipe or condensate trap
is blocked or frozen
Fill the condensate trap with water
* Air extract rates are too low
Activate the boost speed when
cooking
Replace the filters
Clean all grilles
Unpleasant cooking
smell in the house
* The filters are polluted/blocked
* The grilles are dirty
Too much
condensation in the
bathroom
* Air extract rates are too low
Page 27 of 28
Push the pipe deeper into the trap
Check the condensate drain and
clean it, if necessary
Activate the boost speed while
showering or bathing
13. Warranty
Applicable to units installed and used in the United Kingdom. Airflow guarantees the Duplexvent
BV400 units for 3 YEARS from date of purchase against faulty material or workmanship. To be
aware of the latest updates of Duplexvent BV400, please register your product at
www.airflow.com.
The warranty only covers the unit, not the re-installation of it if required.
In the event of any defective parts being found, Airflow Developments Ltd reserve the right to
repair or at our discretion replace without charge provided that the unit:
1. Has been installed and used in accordance with the fitting and wiring instructions supplied
with each unit.
2. Has not been connected to an unsuitable electrical supply.
3. Has not been subjected to misuse, neglect or damage.
4. Has not been modified or repaired by any person not authorised by Airflow Developments Ltd
5. Has been installed in accordance with latest Building Regulations and IEEE wiring
regulations.
6. Has been installed by a competent person who is qualified to do so.
Airflow Developments shall not be liable for any loss, injury or other consequential damage, in
the event of a failure of the equipment or arising from, or in connection with, the equipment
excepting only that nothing in this condition shall be construed as to exclude or restrict liability for
negligence.
All goods are sold according to Airflow Developments Limited's Standard Condition of Sale
which is available on request.
In the interest of continuous development Airflow Developments Limited continuously strive to
improve their products and reserve the right to change specifications and prices without prior
notice.
This warranty does not in any way affect any statutory or other consumer rights.
All information believed correct at time of going to press.
80000137 - Issue 1 5/13
REV04 11.08.2015
Page 28 of 28
95201082