Airflow Duplexvent BV400 Operating instructions

MODEL: BV400
Mechanical Ventilation with Heat Recovery
User and Maintenance Manual
Part No: 90000660
PLEASE RETAIN THESE INSTRUCTIONS WITH THE PRODUCT
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1. Introduction................................................................................................................
2. Why Ventilate?...........................................................................................................
3. How Does A Ventilation System With Heat Recovery Work?................................
4. Components...............................................................................................................
5. Technical Data............................................................................................................
6. Performance Curve....................................................................................................
7. Sound Curve...............................................................................................................
8. Dimensions.................................................................................................................
9. Operating Instructions..............................................................................................
9.1 Pro Control Settings.....................................................................................
9.2 Pro Panel Screen.........................................................................................
9.3 Pro Panel Error Code List............................................................................
9.4 Modbus Connection.....................................................................................
9.5 Fan Speed Adjustment.................................................................................
9.6 Other Control Functions...............................................................................
9.7 Control Card Troubleshoot...........................................................................
10. Maintenance Instructions........................................................................................
10.1 Filter Maintenance......................................................................................
10.2 Heat Exchanger Maintenance....................................................................
10.3 Sensor Replacing Instruction.....................................................................
10.4 Other Maintenance Procedures.................................................................
11. Accessories..............................................................................................................
12. Troubleshooting.......................................................................................................
13. Declaration Of Conformity......................................................................................
14. Warranty....................................................................................................................
4
4
5
6
6
7
8
9
10
11
12
14
15
19
19
23
25
25
26
27
28
28
29
30
32
INDEX

1. Introduction
2. Why Ventilate?
Dear Customer,
Thank you for choosing a Duplexvent Mechanical Ventilation with Heat Recovery (MVHR) unit.
The balanced heat recovery ventilation unit Duplexvent BV400 has a state of the art design and
must be used according to the planning calculations and operating instructions.
Please read the information in the user manual carefully before you start using your equipment.
In this document you will find instructions for usage and maintenance which are necessary to
operate your unit properly and improve the longevity of your ventilation unit.
This manual is intended for qualified installers and users of this unit. 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: [email protected]
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 relevant 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.
Electrical Connection
Caution: Before opening the door of the unit for cleaning, filter replacement or
general maintenance always make sure that the equipment is
isolated or disconnected from the power supply.
With ever increasing energy costs the need to conserve heat and power is leading to higher
levels of insulation and air tightness in residential dwellings and commercial buildings which
inevitably leads to poor indoor air quality.
In a healthy home, thousands of litres of fresh air are needed every day to replace the moist air
generated by individuals and also through cooking, washing and bathing (please refer to UK
Building Regulations, Approved Document F for guidance).
Danger
Electric Shock
risk
Page 4 of 32

3. How Does A Ventilation System With Heat Recovery Work?
Heat Recovery is a process of continuously heating incoming fresh air, by using the heat energy
from outgoing stale, warm air and transferring a percentage of it to the incoming fresh air. This is
accomplished by passing the incoming and outgoing air through a highly efficient heat
exchanger. At no time do the airstreams mix as the heat radiates through plates of the heat
exchanger, so no odour issues are possible.
Extract Air
Stale air is contaminated with humidity and odours which are extracted from the kitchen,
bathroom, toilet, en-suite and utility rooms. Extraction vents in wet room areas allow a constant
air volume to be extracted.
This is backed up by a boost facility, removing stale air at a higher rate for a short period of time.
Supply Air
Fresh oxygenated air from outside passes through the filter and heat exchanger before being
supplied into bedrooms, living and dining rooms etc. This fresh air is drawn into the various wet-
rooms collecting pollutants on its way such as moisture, odours, allergens and volatile organic
components. The air is also heated as it passes from room to room using the statutory gap at the
bottom of internal doors when closed.
The now stale, polluted air is then drawn out of wet rooms through the heat recovery unit to
outside, completing the cycle.
Ventilation is necessary to provide a healthy and comfortable internal environment for a
building's occupants. The main task of ventilation is to remove polluted indoor air from a building
and replace it with fresh outdoor air.
Page 5 of 32
1
1
2
3
4
5
2
3
4
5
Extracted Air:
bathroom, en-suite, toilet,
utility and kitchen
Stale Air to Outside
Incoming Fresh Air
Heat Recovery Unit
Fresh Air from Outside:
bedroom, living-room and dining-room

EC Fan Speed settings selected on installation
(Low & High speed levels are 100% adjustable)
Typical Ventilation Settings at 100 Pa
Rated Voltage
Maximum Air Volume (at 0 Pa)
Air Volume (at 100 Pa)
Thermal Efficiency
Specific Power Input
Power Supply
Maximum Power Input
Maximum Current
Filter Class (conforming to EN779)
Duct Connection Ø
Condensate Discharge Ø
Protection Class
Operating Temperature
Operating Humidity
Dimensions (W x H x D)
Weight
*Low speed air flow is given for 50 Pa.
450 m³/h (125 l/s)
370 m³/h (103 l/s)
90.5%
0.259 W/m³/h
230V / 1PH / 50Hz
169 W
1.5 A
G4 (F7 optional)
160 mm
22 mm
IP44
-10°C to +40°C
0% to 80% RH
710 x 725 x 630 mm
41 kg
50 m³/h
3.0 V
Low
160 m³/h
5.5 V
Medium
310 m³/h
8.0 V
High
370 m³/h
10.0 V
Boost
4. Components
5. Technical Data
Page 6 of 32
1
2
2
3
4
5
6
Control Box
Extract & Supply Air Filters
By-pass Module
Heat Exchanger
Metal Casing
Extract & Supply Air Fans
* Humidity sensor is built-in as a standard.
5
6
6
1
4
3

Page 7 of 32
0
0
50
100
150
200
250
300
350
400
450
500
100 200 300 400 450 500
350
250
150
50
Air Volume (m³/h)
External Pressure (Pa)
Low Speed
Medium Speed
High Speed
Boost
6. Performance Curve

Low Speed
Medium Speed
High Speed
Boost
7. Sound Curve
Octave Sound Pressure Level (dB: Overall A Scale )
Central Frequency (Cycle per Second) Hz
dB(A)
63 125 250 500 1000 2000 4000 8000
NR0 NR10 NR20
NR40
NR50
NR60
NR30
60
50
40
30
20
10
The graph below shows Octave Sound Pressure Level for different fan speeds and Frequency
bands. It also shows the NR curves, which specify Maximum Noise Rating Level for various
applications according to the table below.
Noise Rating Curve
Maximum Noise
Rating Level
Application
NR 25
Concert halls, broadcasting and recording studios, churches
NR 30
Private dwellings, hospitals, theaters, cinemas, conference rooms
NR 35
Libraries, museums, court rooms, schools, hospitals operating theaters
and wards, flats, hotels, executive offices
NR 40
Halls, corridors, cloakrooms, restaurants, night clubs, offices, shops
NR 45
Department stores, supermarkets, canteens, general offices
NR 50
Typing pools, offices with business machines
NR 60
Light engineering works
NR 70
Foundries, heavy engineering works
Page 8 of 32

8. Dimensions
Front View
Front View
Service Space
Top View
Top View
710
725
731
10
160
287 116
23
130 103475
Rear
Rear
Front
Front
630
610
A clear space of 600mm
should be provided in
front of the unit to allow
for servicing.
Page 9 of 32
Clearance for condensate drain
Front View
Front View
Service Space
Top View
Top View
710
725
731
10
160
287 116
23
130 103475
Rear
Rear
Front
Front
630
610
*All dimensions are in mm.
min. 110 mm.

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 (i.e.
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.
Note: The low and high speed levels can be adjusted for commissioning purposes by changing
values in Registers 68-71 in Pro Panel (please see chapter 9.4.4).
This can be also done by using manual potentiometers, which are located at the control box
mounted on the Fan module inside 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.
Parameters Settings
Low Speed Supply/Extract 30% (3V)
55% (5.5V)
80% (8V)
100% (10V)
15 min
1 min
3000 hours
22°C
Extract Air Temperature
-3°C
15 min
0°C
Medium Speed Supply/Extract
High Speed Supply/Extract
Boost Speed Supply/Extract
Manual Boost Overrun
On-demand Boost Delay
Filter Timer
Requested Indoor Temperature
Indoor Temperature Selection
Defrost Temperature
Defrost Cycle
Pre-heater Temperature
Default Factory Settings
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Page 11 of 32
9.1 Pro Control Settings
1.ON / OFF: Press for 3 seconds.
2. Press or to switch to screens in between.
- Press to switch to next screen.
- Press to switch to previous screen.
3. Press to change any value on screen.
- Press to increase existing value +1
- Press to decrease existing value -1
4. Press to exit existing menu.
6. Child Lock: To activate this function, press and 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.
8. Press and simultaneously to adjust screen brightness and
contrast.
5. Press to activate “boost” function for 3 seconds.
Do not connect any accessorıes or ancillerias, such as the pro panel or any additional sensors,
unless the unit ıs down powered and isolated from the mains electricty supply.
!
7. To reset the filter timer, press and continue to hold
and . This will start countdown from 6. Once this countdown
is finished release and and then press .

In VOD mode fan speed is controlled proportionally according to the readings from the sensor 1
(humidity sensor).
Page 12 of 32
9.2.1 Screen Symbols (Main Screen)
1. Screen 2. Screen 3. Screen 4. Screen
Screen Brightness
and Contrast Setting
Company
Introduction
Timer
Main Screen
Standard mode
Single fan mode (only
exhaust fan is running.)
Single fan mode (only
supply fan is running.)
VOD (Auto) mode
Fan speed: High
Fan speed: Med
Fan speed: Low
Fan speed: Boost
Fan speed: Auto (If unit is on VOD mode.)
Fan is off
Supply fan
Fan is on
Exhaust fan
airflow.com
9.2 Pro Panel Screen

Page 13 of 32
Outdoor air temperature
Indoor air temperature
Set temperature
There is no
pre-heater.
Pre-heater is off.
Pre-heater is on.
There is no heater.
Heater is off.
Heater is on at first stage.
Heater is on at first and
second stage.
There is water coil. It is off.
Cooling coil is on.
Heating coil is on.
No failure, freezing scenario
is off.
During a failure situation, the
code “ERR” and its code will
be seen on screen.
Filter dirty
Freezing scenario is on.
There is no by-pass.
By-pass is off.
By-pass is on.
BMS and TIMER
is not adjusted.
BMS is on.
TIMER is on.
9.2 Pro Panel Screen
9.2.1 Screen Symbols (Main Screen)

Page 14 of 32
9.2.2 Screen Symbols (Timer)
9.2.3 Screen Symbols
(Company Introduction)
airflow.com
9.2.4 Screen Symbols
(Screen Brightness and Contrast Setting)
Start-up time of unit
Screen brightness value
Screen contrast value
Shut down time of unit
Time hh.mm.ss
Date yy.mm.dd
The unit will not automatically restart in the event of a power cut until the timer has been programmed.
TIMER is off
TIMER is on: 5 weekdays
TIMER is on: Weekdays+Saturdays TIMER
TIMER is on: All days
Company logo and
internet address
Pro panel software version
9.2 Pro Panel Screen
9.3 Pro Panel Error Code List
Register 25
Value
0----- Unit is working normally.
1 ERR 1 Fire alarm
2ERR 2 Heater alarm
3 ERR 3 Supply fan failure (OA)
4 ERR 4 Exhaust fan failure (RA)
5 ERR 5 Outdoor air temperature sensor failure (OA)
6 ERR 6 Return air temperature sensor failure (RA)
7 ERR 7 Pro Panel sensor failure (P)
8 ERR 8 Supply air temperature sensor failure (SA)
9 ERR 9 Sensor-1 failure
10 ERR 10 Sensor-2 failure
12 FILTER Dirty filter alarm.
Pro Panel
Screen Code Description
15 ERR 15 Pro Panel communication error

Fig. 2.1 RS485 Wiring Example
This document includes the protocol of Modbus communication that is used with ENECON
control boards.
Control board uses Modbus RTU protocol via RS485 connection. The unit works as Slave and
the information can be taken from an external Master module.
Connection information of the unit is listed as below:
Connection Type: Modbus RTU Slave
Standard Address: 1
Link speed: 9600
Party: None
Data Bits: 8
Stop Bit: 1
Communication network is showed below. Control board can be connected to RS485 on which is
connected more than one unit. Address conflicts on this line should be removed and necessary
software settings should be done for data communication.
If the line is too long or if any communication problem occurs, 120 Ohm resistance should be
added at the beginning and end of the line as shown on schema.
DI
D
D
DI DIDE DE
DE
DI
RO
RO RO
D
D
R
R
R R
A
B
120Ω 120Ω
B B
B
A
A A
DE
RO
RE
RE RE
RE
9.4 Modbus Connection
9.4.1 Introduction
9.4.2 Properties
9.4.3 Physical Connection
Page 15 of 32

9.4.4 Modbus Register List
9.4 Modbus Connection
0 1 r - -
Version of program Version of installed program [MMYY]
61rrpm -
Speed of supply fan - -
-
71rrpm -
Speed of exhaust fan -
-
11 0.1 rºC -
Outdoor air temperature TerOA
-
12 0.1 rºC -
Return air temperature TerRA
-
13 0.1 rºC -
Supply air temperature TerSA
-
14 0.1 rw ºC [-40,80]
Pro panel temperature TerP
-
15 0.01 r%-
Sensor-1 input VOC, humidity, CO2 sensors
Constant pressure sensor
-
16 0.01 r%-
Sensor-2 input -
Multiplier Access Unit Limit Valid Explanation
Name
ID
28
17
Supply fan high speed value
Filter Sensor
29 1r
Exhaust fan low speed value -
30
54 1rw -[0,2]
Supply fan fault method selection
55 1rw -[0,2]
Exhaust fan fault method selection
57 1rw ºC [1,10]
2nd stage temperature difference
0-Tachout, 1-NC, 2-NO
0-Standard, 1-Only exhaust fan, 2-Only supply
fan, 3- VOD
0-Tachout, 1-NC, 2-NO
1
1
r
r
%
-
%
-
-
-
-
Shows if the filter sensor is installed or not
-
-
-
1r
Exhaust fan medium speed value -
%- -
31
50
1
1
r
rw
Exhaust fan high speed value
Mode selection
-
-
-
%
-
-
[0,3]
-
0
0
0
51 1rw -[1,254]
Modbus address 1
3
27
Supply fan low speed value
Supply fan medium speed value
26 1r%--
-
1r%--
-
58 1rw -[0,1]
Frost protection algoritm 0-Passive 1-Active0
Page 16 of 32
r: read, rw: read and write

9.4.4 Modbus Register List
9.4 Modbus Connection
Multiplier Access Unit Limit Valid Explanation
Name
ID
Page 17 of 32
-
64 1rw %[50,100]
Boost panel speed 100
-
-
-
-
73 Electrical heater cooling time
65 1rw min [1,30]
Boost panel time 15
66 1rw %[50,100]
Boost PCB speed 80
67 1rw min [1,30]
Boost PCB time 0
68 1rw %[20,High]
Supply fan low speed reference
point If the speed pots are unadjusted, this register
becomes active.
If the speed pots are unadjusted, this register
becomes active.
If the speed pots are unadjusted, this register
becomes active.
If the speed pots are unadjusted, this register
becomes active.
30
69 1rw %[20,100]
[20,100]
Supply fan high speed reference
point 80
80
70 1rw %[20,High]
Exhaust fan low speed reference
point 30
71 1rw %
Exhaust fan high speed reference
point
1rw sn [20,600] 30
74
75
Thermostat option
Thermostat option for room 1rw
79 1rw %[5,50]
Run percentage of frost protection
senario in a period
80 1rw -[0,1]
Selection of frost protection
algoritm
81 1rw -[0,3]
Selection of fire senario
0-Troom, 1-TerSA
0-TerRA, 1-TerP
0-FanOA:Low FanRA:High 1-FanOA:Stop
FanRA:Run
0-FanOA, 1-FanRA, 2-FanOA and FanRA
82 1rw %[0,50]
[0,2]
[5,60]
Fan deceleration speed
(for By-pass)
0-Unit off 1-FanOA:High FanRA:High 2-FanOA:
HighFanRA:Stop 3-FanOA:Stop FanRA:High
83
84
1
1
rw
rw
-
min
Fan selection (for By-pass)
Run time for frost protection
scenario
1rw -
-
[0,1]
[0,1]
-
0
0
0
76 Run time for filter 1rw hr
[200,6000] 3000
77 Filter contamination time 1rw hr
50
0
78 1rw ºC [-10,0]
Frost protection temperature 0
0
10
0
10 -
-
-
-
-
[0,1]
[0,1]
0-Passive 1-Active
0-Manuel 1-Automatic
59
60
1
1
rw
rw
-
-
Cooling coil
Childproof safety lock
0
0
0-Passive 1-Active
[0,1]
61 1rw -
Boost panel 1
r: read, rw: read and write

9.4.4 Modbus Register List
9.4.5 Pro Panel Service Menu
9.4 Modbus Connection
Multiplier Access Unit Limit Valid Explanation
Name
ID
[5,60]
[0,1]
[0,100]
[0,100]
[0,1]
1
1
100
100
1
rw
rw
rw
rw
rw
min
-
%
%
-
Fan fault period
Sensor-1 status
Lower limit value of sensor
Upper limit value of sensor
Sensor-2 status
5
0
-
-
0
90
91
92
93
96
100
101
113
1
1
1
rw
rw
rw
-
-
-
[1,254]
[1,254]
[0-9999]
Control board connection address
Pro-Panel modbus address
Service menu password
1
1
1919 -
-
-
-
0-Passive, 1-Active
-
-
0-Passive, 1-Active
r: read, rw: read and write
Page 18 of 32
1. Press and simultaneously for 3 seconds to active “service”
menu.
2. Press for entering password.
4. Press for approval.
5. Press for return main menu screen.
3. Press and for changing values.

9.5 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 inside 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 19 of 32
Potentiometer
for Low Speed
Medium speed will be set automatically by
the controller's software taking the mid-point
of the High and Low fan speed settings.
Connection Socket for
Control Switch Cable
PCB
Diagram
Fan speed
potentiometers
Potentiometer
for High Speed
Note: The low and high speed levels can be adjusted for commissioning purposes by changing
values in Registers 68-71 in Pro Panel (please see chapter 9.4.4).
This can be also done by using manual potentiometers, which are located at the control box
mounted on the Fan module inside 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.
9.6 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) “Boost” function is activated by pressing on Pro Panel for 3 seconds. After unit
runs at boost speed (maximum speed) and during boost time (15 minutes) , it begins
to run at the speed value that is set before boost function is activated.
b) There is one dry contact relay input and one 230V input on control board. If one of
these inputs is activated, unit begins to run at “boost” speed. When activated input is
passive again, unit begins to run at the speed value that is set before boost function is
activated.
Note: Boost speed and boost time are changeable on Pro Panel.

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).
Volt-free
connection
for boost
Switched live
connection
for boost
2
1
UNIT-OK UNIT-FAULT UNIT-RUN
Page 20 of 32
The factory set can be changed on pro panel screen.
Outdoor air temperature
Indoor air temperature
Set temperature
1. Press for coming to marked area
the site.
3. Press for activate of changing the
set value.
2. Press and for selecting the “S”.
4. Press and for changing the set
temperature.