Airflow Duplexvent DV72 Manual

MODEL: DV72
Mechanical Ventilation with Heat Recovery
Installation Instructions and User Manual
Commissioning Data: to be completed by the installer
Date of installation:
Configuration Left Hand Right Hand
Product Serial No:
Important: This multi speed unit requires Air Flow Rates to be adjusted on installation.
This manual must be kept by the householder.
9041381- Issue 8 9/11

Index
1. General 3
2. Introduction 4
2.1. General 4
2.2. Overview of fitting the HR unit 4
3. Installation 5
3.1 Fitting the HR unit 5
3.2 Important instruction 5
3.3 Connecting ducts 6
3.4 Connecting condensation drain 6
3.5 Electrical connections 10
3.6 Installation diagram / Fitting the unit 12
4. User Maintenance 13
4.1 Cleaning the filters by user 13
4.2 Cleaning the heat exchanger by user 14
5. Technical specifications 15
5.1 Appliance data 15
5.2 Expanded view of the HR unit 16
SAP Appendix Q test results 17
Declaration of conformity 20
Warranty 21

1. General
To maintain a healthy indoor environment, closely controlled ventilation is essential. There are
many pollutants that will affect the indoor air quality: human body waste products in the shape of
CO
2
, dead skin, perspiration and moisture. Add to this the waste products of cooking (cooking
smells), showering (moisture), gases from building materials and the waste products of pets.
Without proper ventilation this would be the perfect environment for the growth of mould,
subsequent damage to the decoration and fabric of a home and to the health of its occupants.
The HR unit is fitted with two, low energy EC fans with a constant (100% adjustable) air volume.
The exhaust fan ensures that warm, damp and polluted air as near as possible to the source is
extracted. The exhausted air has to be replaced with fresh air, so the heat recovery unit not only
has an exhaust fan, but is also fitted with a supply fan and air filters.
The supply air, which in winter is colder than the inside air, is heated in the heat recovery unit
using the heat of the exhaust air by means of the heat exchanger. This heat exchanger has an
efficiency of 91%, so a minimum loss of heat takes place and the supply air temperature enters
the home at a comfortable level.
In exceptionally cold weather or winter conditions it is possible that the exchanger may freeze
due to sub-zero, cold incoming air. Therefore the unit must be sited in a frost-free location.
Alternatively, an in-duct heater may be used to protect the heat exchanger from freezing.
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 have to be cleaned every month, depending on the pollution. The
filters should be replaced annually or after a maximum of two cleaning cycles.
The unit’s condensate drain must be connected to the household drainage system and must be
insulated.
If the ductwork passes through an unheated area (loft or similar location), it must be insulated
with an insulation material that complies with the latest Building Regulations.
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.
In the event of a power failure or the unit being turned off, restart the unit at High Speed.
This MVHR unit has a soft start.
It is important to follow the advice in this user manual and correctly maintain the system
to ensure a healthy indoor environment.
3

2. Introduction
2.1 General
Duplexvent DV72 is a complete heat recovery unit to ensure optimum efficiency for your home.
The unit can easily be set up for left or right hand operation. This can be done by changing the
position of the condensation drain at the bottom of the unit. See figure 3 on page 4.
Using the stand-off feet, screws and plugs supplied, fit the unit vertically either in a kitchen
cupboard or on a wall.
The unit is delivered complete with a mounting plate, fitting instructions, fixing kit, condensation
discharge fitting and a five speed switch (3 x manual, 2 x external sensors).
2.2 Overview of fitting the HR unit
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1. Dismantle the HR unit in accordance with Section 3 of this manual
2. Mounting plate: Mounted by means of stand-off feet, screws and plugs supplied (for vertical
installation). Locate the hole positions, ensuring that there is enough space around the unit
so that the duct work and the condensation drain can be fitted
3. Reassemble the HR unit in accordance with Section 3 of this manual.
4. When the HR unit has been mounted, the ducting runs can be completed. Remember that
both ducts to and from the outside should be fitted to one side of the unit and the ducts to
and from the home are attached to the other side of the unit. Also the condensation
discharge under the unit can be fitted at this stage, please see figure 3 for reference on
which side it should be fitted.
5. If an appropriate electrical supply is present, the installation can be completed when the
duct runs are completed.
For further information about the operation, adjustment and maintenance of the unit, read the
following pages carefully.
3. Installation
3. Fitting the HR unit
The mounting plate of the HR unit can be fitted directly to the wall or joists with the screws, plugs
and stand-off feet provided. Ensure that there is enough space for the condensation fitting and
ducts to be connected. The position of the electrical power supply (an earthed wall socket or
fused switched spur) must not be mounted above or closer than 1m to a cooker where it could
be affected by excessive heat or moisture.
The unit is designed to be mounted in a 600mm wide cupboard or on a wall.
Make sure there is a free space at the front of the appliance for cleaning the filter and carrying
out maintenance on the appliance.
For horizontal installation please contact one of our technical sales representatives.
3.2 Important instruction
Installation of the appliance must be carried out by a qualified and suitably competent person in
accordance with all relevant Building Regulations, Health & Safety requirements and the fitting
instructions of the heat recovery unit. Installation should be carried out in clean, dry conditions
where dust and humidity are at minimum levels. This appliance is not suitable for outdoor
installation. IEE wiring regulations must be adhered to.
5

3.3 Connecting ducts
When the heat recovery unit has been installed the ducts can be fitted. The ducts to and from the
home are on one side of the unit. The ducts to and from outside are on the opposite side.
In order to prevent condensation on the outside of the exterior air inlet duct and the air outlet
duct, both ducts must be insulated.
It is recommended that insulated ducting to be used for the ducts to and from the appliance,
without placing any strain on the terminal or fixings.
Remember: When sizing the ducts try to ensure that the total resistance of the inlet as well as
the exhaust system does not exceed 100 Pascal.
A = No exhaust duct too close to
the air inlet
B = Inlet duct from roof
C = Outlet duct from roof
D = HR unit
E = Ducts from and to the house
F = Condensation drain with
U-bend (not supplied)
Fig 2: Connection example of Heat Recovery Unit
3.4 Connecting condensation drain
The condensation drain must be mounted at the bottom of the heat recovery unit with the fitting
supplied. Use a 20mm core drill bit to drill a clean hole which removes the debris, taking care to
drill on the correct side of the unit according to left or right handed configuration. Only drill the
hole from the inside out so as to avoid any damage to the heat exchanger or the mains cable.
Use silicon to seal the condensation fitting to the back half of the HR unit.
6

Please follow the steps below:
1) Lay the unit on a flat level surface and remove the front half to the unit and put aside.
2) Carefully slide the heat exchanger out from the housing
3) Determine what side you want the condensate drain to be (see figure 3 for left and right hand positioning). If
mounting the unit vertically the condensate hole needs to be in position shown at its lowest point to allow the
condensate to run out (image shown for right hand installation).
7

4) Mark off with a pencil 173,5mm from the side of the unit (see figure 3) taking into account left or right hand
configuration. From this point measure 52,5mm towards the rear of the unit – this is the point deemed to be
the most effective location for the condensation drain. Now use a 20mm core drill bit to drill a clean hole at
this point ensuring all the debris is removed.
5) Screw the condensation fitting as shown and silicone seal to create a water tight seal.
6) Connect up to the household drainage system.
7) Ensure that the drain incorporates a U-bend to prevent air penetration.
8) Ensure that the distance between the unit and the U-bend is adequate for de-mounting and cleaning if
required.
8

Vertical Position
Left Right
Figure 3: Connection of HR unit to drain pipe
Condensation drain: 22mm standard PVC
Important Note: The unit can only be mounted horizontally with an additional condensation kit.
This unit is not suitable for ceiling suspended installation.
For more information please contact one of our sales representatives.
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3.5 Electrical connections
The appliance must be earthed. All wiring must confirm to BS 7671: Latest edition IEE wiring
regulations.
This appliance is suitable for 230v ~ 50Hz single phase supply fused at 3 amps.
This appliance is supplied with a mains flexible cable (PVC sheathed, 6-core 0.75mm
2
).
A double pole switch having a minimum contact separation of 3.0mm must be used to provide
isolation for the unit.
Switch Positions Function
Low (R1 / Low) 100% adjustable
Medium (R2 / Med) 100% adjustable
High (R3 / High) 100% adjustable
Remote Switch Positions
(R4) 100% adjustable
(R5) 100% adjustable
Upon installation the fans should be started in High Speed mode to ensure optimum performance
of the fans and switched to the required continuous ventilation setting.
The fan speed control must not be mounted above or within1m of the cooker where it could be
affected by excessive heat or moisture.
Wiring diagram
A five speed control switch (3 x manual, 2 x external sensors) is supplied. Each fan speed must
be adjusted to suit dwelling on installation (R1-Low/R2-Med/R3-High).
Any optional external sensors, i.e.: CO
2
, Humidity, Timer/Clock, Motion/PIR must also be
adjusted when connected (R4, R5).
Suggested set points are shown for general purpose ventilation (trickle, medium, purge) which
enable manual boost for purge (maximum) ventilation and/or override of external sensors when
fitted.
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Figure 4: Electrical Diagram
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3.6 Installation diagram / Fitting the unit
6
1. Pull the green front cover off the six Velcro fixings.
2. Place the unit flat on the floor and unscrew the four stud retaining screws - keep screws safe.
3. Without damaging the rubber seal, separate the moulded top half of the unit from the bottom
half by pulling the casing straight forward.
4. Unscrew the four forward protruding studs and keep safely.
5. Stand unit upright to separate the metal wall mounting plate from the bottom half of the casing.
Pull the casing forward leaving the rear protruding studs attached to the metal back plate.
6. Secure the metal base plate with the rear studs still attached to the wall.
7. Re-assembly of the unit to the wall mounted back plate with the protruding studs is the reverse
of the removal procedure.
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4. User Maintenance
User maintenance is limited to periodically cleaning the filters and the heat recovery cube. The
unit should not be used without filters.
4.1 Cleaning the filters by user
1 2
Switch off the power supply Remove the filters
Remove front panel
Remove filter covers
3 4
Vacuum the outside of the filters After cleaning replace filters
Replace filter covers and front panel
Always ensure that the date is recorded
on the back of the front panel
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4 .2 Cleaning the heat exchanger by user
1 2
Important: Switch off the power supply Unscrew the 4 screws on the front
Remove front panel of the unit.
Remove the front half of the unit
3 4
Remove the heat exchanger Reassemble the unit taking care
Clean the heat exchanger with not to damage the rubber seals
warm, soapy water
Use a sterilizing agent to sterilize
The fans must be cleaned if they are dirty. Be sure not to bend the blades of the fan since this
could cause a motor imbalance, unnecessary noise and will shorten the life of the motor
bearings. To expose motors, follow the above instructions and vacuum out where necessary.
We recommend that this is done at the same time as cleaning the heat exchanger.
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5. Technical specifications
5.1 Appliance data
Fan air performance graph
15
EC Fan Speed settings selected on installation
(100% adjustable) Low / R1 Middle / R2 High / R3 R4 R5 Max
Typical Ventilation Settings [m
3
/h] 54 140 280 97 75 280
Rated power [W] 10 42 150 20 14 150
Permissible duct/system resistance [Pa] 100 Pa at 200 m
3
/h
Maximum flow (Free Discharge) 280 m
3
/hr (78 l/sec)
Low and Medium flow and optional sensor inputs
0-100% adjustable on each speed.
Set on installation
Dimensions (w x h x d) [mm] 560 x 635 x 260
Duct diameter [m] Ø125
External diameter condensate discharge [mm] 22
Filter class EU3
Weight [kg] 14 kg
Supply voltage [V~/Hz] 230v / IPh / 50Hz
Power (watts) Maximum 150W
Protection degree IPX2
Thermal efficiency 91%
Switched External sensor

5.2 Expanded view of the HR unit
Please refer to guarantee terms for repair/replacement within the guarantee period. After expiry
of the guarantee when ordering parts, be sure to mention the article number (see exploded view),
the type of heat recovery appliance, serial number, production year and the name of the part:
Example Appliance type : DV72
Serial number :
Year of production : 2010
Part No : 9041322
Part required
Replacement Filters (2) : 9041511
Type and serial number are printed on the identification plate on the top of the inner assembly.
Parts List
Nr Article description
1
2
3
4
5
6
7
8
9
10
Front cover
Filter covers
Filters (9041511 pack of two)
EPP mouldings
Heat exchanger
EC fans
Fan assembly plates
Outlet/inlet spigots
Condensation drain
Back plate
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SAP Appendix Q Testing Results
Central mechanical supply and exhaust ventilation system packages with
heat recovery used in a single dwelling
Brand Name Airflow
Model Duplexvent DV72
Model Qualifier (if applicable)
Current Manufacturer
and Contact Details
Name Airflow Developments Ltd
Address
Lancaster Road
Cressex Business Park
High Wycombe
HP12 3QP
Telephone [phone]
Website www.airflow.co.uk
Original Manufacturer (if different)
First Year of Manufacture 2010
Last Year of Manufacture
Testing Body BRE
Date of test 22/03/2010
Serial Number of Product Tested 5780 EC
MVHR to outside grille duct types and
size
150 & 125 mm diameter rigid
plastic and 200 mm diameter
rigid plastic
Duct types and sizes used for supply
and exhaust
150 & 125 mm diameter rigid
plastic and 200 mm diameter
rigid plastic
Results of leakage tests
Table Q1
Internal Pass
External Pass
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Results for SAP calculations (at minimum flow rate condition)
This product has only been tested with rigid ductwork and the data are not applicable for SAP
calculations if installed with flexible ductwork.
Table Q2 – Systems with rigid ductwork only
Exhaust
terminal
configuration
Fan
speed
setting
Specific
fan
power
(W/l/s)
Heat
exchange
efficiency
(%)
Energy Saving
Trust Best
Practice
Performance
Compliant
Kitchen +
1 additional wet
room
100%
Variable
0.73 91
Yes
Kitchen +
2 additional wet
rooms
100%
Variable
0.72 90
Yes
Kitchen +
3 additional wet
rooms
100%
Variable
0.79 89
Yes
Kitchen +
4 additional wet
rooms
100%
Variable
0.93 88
Yes
Kitchen +
5 additional wet
rooms
100%
Variable
1.06 87
No
These figures are entered into either:
(a) In the case of SAP software amended to SAP 2005 version 9.81 allowing direct entry of
MVHR data, the SAP software, or
(b) In the case of SAP software amended to SAP 2005 version 9.81 not allowing direct entry of
MVHR data, the SAP Q MVHR Calculation Spreadsheet v9.81 and the results from the
spreadsheet into the Special Features part of the SAP 9.81 software, or
(c) In the case of SAP software to SAP 2005 version 9.80, the SAP Q MVHR Calculation
Spreadsheet v9.80 and the results from the spreadsheet into the Special Features part of the
SAP 9.80 software. They must NOT be entered directly into SAP 2005 version 9.80 software
18

Table Q3 – Systems with flexible ductwork only
Exhaust terminal
configuration
Fan
speed
setting
Specific
fan
power
(W/l/s)
Heat
exchange
efficiency
(%)
Energy Saving
Trust Best
Practice
Performance
Compliant
Kitchen +
1 additional wet
room N/A
N/A N/A
N/A
These figures are entered into either:
(a) In the case of SAP software amended to SAP 2005 version 9.81 allowing direct entry of
MVHR data, the SAP software, or
(b) In the case of SAP software amended to SAP 2005 version 9.81 not allowing direct entry of
MVHR data, the SAP Q MVHR Calculation Spreadsheet v9.81 and the results from the
spreadsheet into the Special Features part of the SAP 9.81 software, or
(c) In the case of SAP software to SAP 2005 version 9.80, the SAP Q MVHR Calculation
Spreadsheet v9.80 and the results from the spreadsheet into the Special Features part of the
SAP 9.80 software. They must NOT be entered directly into SAP 2005 version 9.80 software
Results for Approved Document F (at maximum flow rate condition)
Table Q4
Exhaust terminal
configuration Fan speed setting
Total
exhaust flow
rate
(l/s)
Total supply
flow rate
(l/s)
Kitchen +
1 additional wet room 100% Variable 15.0 15.0
Kitchen +
2 additional wet rooms
100%
Variable 21.0 21.0
Kitchen +
3 additional wet rooms
100%
Variable 27.0 27.0
Kitchen +
4 additional wet rooms
100%
Variable 33.0 33.0
Kitchen +
5 additional wet rooms
100%
Variable 39.0 39.0
Comments
Only figures from Table Q2 or Table Q3, not both, should be used with the SAP Q Calculation
Spreadsheet for this technology type.
Table Q4 results are only applicable for Approved Document F requirements.
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Declaration of Conformity
We declare that the equipment detailed below conforms to the requirements of the EC council
directives relating to electromagnetic compatibility and safety of electrical equipment.
Equipment type: The Heat Recovery Appliance Model: DV72
Supplied by Airflow Developments Limited
Aidelle House, Lancaster Road
Cressex Business Park
High Wycombe
Buckinghamshire
HP12 3QP
T: [phone]
Visit: airflow.com
Description of equipment: Mechanical Heat Recovery Ventilation Unit
Relative EC Council Directives: 2004/108/EC (EMC)
2006/95/EC (LVD)
Applied Harmonised Standards: EN 60335-1:2002/A2:2006
EN 60335-2-80:2003/A1:2004
BS EN 308:1997
EN13141-7:2004
Airflow Developments Limited warrants that heat recovery appliances are manufactured from
high quality materials and that continuous quality control ensures that they comply with the above
directive.
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