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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. 
 
 
 
 
 
 

 

Summary of Contents for Duplexvent DV72

Page 1: ...r 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 adj...

Page 2: ...ts 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 exch...

Page 3: ...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 site...

Page 4: ...e 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 wa...

Page 5: ...allation 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 th...

Page 6: ...l 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 dr...

Page 7: ...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...

Page 8: ...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 wat...

Page 9: ...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...

Page 10: ...pon 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 m...

Page 11: ...Figure 4 Electrical Diagram 11...

Page 12: ...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 Pu...

Page 13: ...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 cleanin...

Page 14: ...at 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 c...

Page 15: ...issible duct system resistance Pa 100 Pa at 200 m3 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 D...

Page 16: ...ction 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...

Page 17: ...h Wycombe HP12 3QP Telephone 01494 525252 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...

Page 18: ...hen 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 versi...

Page 19: ...005 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 20...

Page 20: ...sex Business Park High Wycombe Buckinghamshire HP12 3QP T 44 0 1494 525252 Visit airflow com Description of equipment Mechanical Heat Recovery Ventilation Unit Relative EC Council Directives 2004 108...

Page 21: ...calendar month and if it was not collected it would be subsequently delivered by Airflow and a delivery charge will be made 5 Has been installed in accordance with the latest Building Regulations and...

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