Vent-Axia PoziDry Pro Assembly instructions

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH THE ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS
Lo-Carbon
PoziDry Pro
Positive Input Ventilation
Unit
Stock Ref. N°
476310 – PoziDry Pro
476311 – PoziDry Pro with Heater
476312 – PoziDry Pro FD
Installation and Wiring Instructions
220-240V~50Hz

2
Installation and Wiring Instructions for the
Lo-Carbon PoziDry Pro Positive Ventilation Unit.
SAFETY AND GUIDANCE NOTES
IMPORTANT:
READ THESE INSTRUCTIONS BEFORE COMMENCING THE
INSTALLATION
1. DO NOT install this product in areas where the following may be present or
occur:
1.1. Excessive oil or a grease laden atmosphere.
1.2. Corrosive or flammable gases, liquids or vapours.
1.3. Ambient temperatures higher than 40°C or less than -5°C.
1.4. Possible obstructions which would hinder access or removal of the Fan.
1.5. Relative humidity above 90%
1.6. Sudden ductwork bends or transformations close to the Unit.
2. All wiring to be in accordance with the current I.E.E. Regulations, or the
appropriate standards of your country and MUST be installed by a suitably
qualified person.
3. The fan must be provided with an isolator switch capable of disconnecting all
poles, having a contact separation of at least 3mm.
4. Ensure that the mains supply (voltage, frequency, and phase) complies with
the fan’s rating label.
5. The fan should not be used where it is liable to be subjected to direct water
spray.
6. This appliance can be used by children aged from 8 years and above and
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given supervision or instruction
concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user
maintenance shall not be made by children without supervision.
7. Precautions must be taken to avoid the back-flow of gases into the room from
the open flue of gas or other fuel-burning appliances.
8. Children of less than 3 years should be kept away unless continuously
supervised.
9. Children aged from 3 to 8 years shall only switch on/off the appliance provided
the unit is installed as intended for normal operation and they have been given
supervision or instruction concerning safe use of the appliance and understand
the hazards involved.
10. Children aged 3 to 8 shall not plug in, regulate and clean the appliance or
perform user maintenance
Caution - some parts of this product can become very hot and cause burns.
Particular attention has to be given where children and vulnerable people are
present.

3
A. INTRODUCTORY NOTES
The Vent Axia Lo-Carbon PoziDry Pro is a positive input ventilation unit, designed to be installed
in the loft of a dwelling to continually supply filtered fresh air into the building. The system
consists of a fan unit, a heater unit (for heater models) and a diffuser (for diffuser models) with a
short length of flexible ducting.
The Lo-Carbon PoziDry Pro has two fully adjustable speed settings; ‘Trickle’ and Energy
recovery’. These speeds are set during installation; there are 5 pre-set speeds or an option
allowing the speeds to be chosen manually from 10L/s to 60L/s. The Lo-Carbon PoziDry Pro
uses a sensor to monitor the temperature in the loft, automatically adjusting the air volume when
necessary.
 The fan will run in ‘Trickle’ speed when the ambient loft temperature is less than 18°C
(adjustable via the Trickle Speed Temperature Threshold setting).
 The fan will run in ‘Energy recovery’ speed when the ambient loft temperature is between
the Trickle Speed Temperature setting (default 18°C) and Temperature Limit setting
(default 27°C).
 If the ambient loft temperature exceeds the Temperature Limit setting (default 27°C), the
fan will automatically switch to standby (no airflow).
 If the ambient loft temperature is below -5°C, the fan will automatically switch to standby
(no airflow).
 Remote Purge/Boost is achievable by using the Boost Switch Link Connector (sold
separately –411150).
The heater (if applicable) will activate when the ambient loft temperature is below the
Heater Threshold Temperature set point (default is 10°C). The set point can be adjusted
between 5°C and 20°C. The heater is designed to try and maintain the heater set point
temperature, however will depend on the chosen flow rates and temperature of the incoming air.
The unit also incorporates a data logging function. This function will display total runtime of
system, time spent in trickle speed, time spent in energy recovery speed, approximate energy
consumption of the fan and approximate energy consumption of the heater unit. This data is non-
resettable.
B. INSTALLATION
TYPICAL INSTALLATION
Fig.1.

4
Lo-Carbon PoziDry Pro UNIT:
Prior to installation ensure that the loft is adequately ventilated.
Ensure that all water tanks are covered and sealed.
Check that all water pipes are lagged.
Ensure that any extract fans are discharging to the outside and not into the loft.
Check that the loft hatch is tightly sealed.
Ensure that all holes in the ceilings are sealed, i.e. ceiling light fittings etc.
A visual inspection of any flues or chimneys for leakage in the loft should be carried out by the
installer.
Flexible ducting is supplied as standard. Ensure that this is pulled out into a smooth single curve
to the grille – with no additional bends or excess ducting. If the application requires a fixed 90
degree bend, straight ducting may be used. See Spares and Accessories section.
The fan unit can be floor mounted or hung from a roof beam.
Hanging method:
The Lo-Carbon PoziDry Pro can be hung from a roof beam (Fig. 2). Fix the screw eye to a
convenient roof beam. Use the cord provided to loop through the eye and around the handle on
the unit, there are various notches for the cord to run through, tie the two ends together using a
suitable knot such as an over hand or fisherman’s knot.
Ensure that the route for the flexible ducting has gentle bends and that the duct cannot be
crushed. See Diffuser Grille Fitment section below for more information.
Fit the filters to the unit. Please make sure that the filters are fitted correctly. This will
ensure that all the fresh air entering the dwelling has passed through the filter first.
Ensure that the screw eye is attached to the beam strongly enough and that the beam is in
sufficient condition to withstand the load. The unit weight is approximately 4 kg.
Fig.2.
Filters
(
See p
g
. 8
)

5
Floor mounting:
Attach the mounting legs to the unit, two per side.
Find a suitable location to fix the unit near to where the diffuser is to be located. Ensure that the
route for the flexible ducting has gentle bends and that the duct cannot be crushed Fig.3. See
Diffuser Grille Fitment section below for more information.
The legs and feet can be adjusted to suit ceiling joists of varying spans. Adjust the legs and feet
so that the unit spans over two joists. Secure the feet to the joists with screws, Fig.4. In the
unlikely event that the legs cannot span the ceiling joists affix the unit to a wooden board or two
lengths of timber which can then be screwed to the joists.
Fit the filters to the unit. Please make sure that the filters are fitted correctly. This will
ensure that all the fresh air entering the dwelling has passed through the filter first.
400-600mm Joist Dimensions with Unit Clearance Heights
Fig. 3. Fig. 4.

6
Diffuser Grille Fitment:
The diffuser must be carefully sited to ensure the maximum effectiveness of the system. It should
be fitted in the ceiling of a common area, ideally above the landing so that the incoming air can
reach all the rooms.
Cut the flexible ducting to a suitable length, where possible stretch the ducting to its maximum
extent and ensure that there is one continuous smooth bend to the diffuser. The ducting must
remain a minimum of 1m in length.
Remove the loft insulation from the location of the diffuser and cut a 240-260mm diameter hole in
the ceiling.
Remove the domed cover panel using a small flat blade screw driver to prise it from the
assembly.
Ensure the four locking tabs are folded in and then push the spigot in to the hole. Holding the
diffuser in place; screw the four screws until the locking tabs are holding the diffuser tight against
the ceiling (Fig.5). It is important not to over tighten these screws as this may warp the
diffuser. Refit the domed cover panel.
Fit the free end of the flexible ducting to the diffuser spigot using the worm drive clip supplied.
IMPORTANT – SMOKE DETECTORS: The diffuser should not be situated within 1m of a smoke
detector, however if this is not possible the Lo-Carbon PoziDry Pro has provisions to blank off the
airflow for up to two quadrants of the diffuser. Two blanking plates are provided; these should be
pushed on to the support struts inside the diffuser as required. This should be done before the
diffuser is installed in the ceiling as when the screws are tightened down the plates can no longer
be removed. See Fig.6, showing blocking off opposing quadrants, note any 1 or pair of quadrants
can be blocked off as necessary for the install. These block off plates can also be used to ensure
the supply air is spread across a room rather than directed at close by walls.
Blanking off one side reduces the flow by about 6%, but blanking off two sides reduces the flow
by about 20% and so if two sides are blanked off then you should consider increasing the fan
speed to maintain the appropriate airflow.
Fig. 5. Fig. 6.

7
TWIN SPIGOT OPTION
(PIV twin spigot kit Ref:- 449071)
Ensure that the adjustable diffuser supplied with the kit is installed nearer to the PoziDry Pro unit
than the diffuser supplied with the unit (Fig.7). This allows both flows to be balanced.
Not to be used with FD models unless the diffuser supplied with the kit is replaced with
diffuser part 475664.
`
Ducting fitment
Ensure the ducting is securely fixed to the diffuser
and fan (or heater if applicable) via the provided
worm drive clips. (Fig 8)
Heater Unit:
The fan/heater unit must not be located
directly below a socket.
AIR FILTER FOAM SEALS
 Please ensure the filter foam seals (x6) are
fitted to the spigot ends before fixing the
filters. (Fig.10/11)
 Line up the foam seals with the edge of the
spigots, making sure not to cover spigot
clips as shown. (Fig.11)
 Then fit filters over foam, on to the spigot
ends. (Fig.11)
Fig. 10.
Fig. 8: Apply worm drive clips provided
in
p
ositions shown
Fig. 7.

8
The Lo-Carbon PoziDry Pro is provided with G4 filters which are suitable for removing airborne
contaminants such as pollen and dust.
Where higher grade filtration is required, optional F7 filters can be used. These filters are
effective at removing finer particles such as particulate emissions from diesel engines. In urban
areas close to main roads F7 filters are advisable in order to ensure the supply air is clear of
these particles which are potentially harmful to health.
Where F7 filters are fitted, please ensure the flow rate of the fan is as expected. F7 filters
cause extra system resistance so it may be necessary to increase the fan speed to
compensate.
Fig. 11.

9
C. WIRING
A means for disconnection must be incorporated into the fixed wiring in accordance with
the wiring regulations.
WARNING: THE POSITIVE VENTILATION UNIT AND ANCILLARY
CONTROL EQUIPMENT MUST BE ISOLATED FROM THE POWER
SUPPLY DURING THE INSTALLATION / OR MAINTENANCE.
The Lo-Carbon PoziDry Pro is designed for operation from a single-phase alternating current
source (220-240V AC).
A 2m integral mains flying lead is connected to the unit for connection to a spur. It should be
capable of disconnecting all poles, having a contact separation of at least 3mm.
WARNING: If the supply cord is damaged, it must be replaced by the manufacturer, its
service agent or a similarly qualified person in order to avoid a hazard.
PoziDry Pro & PoziDry Pro with Heater unit:
 Ensure the local AC power supply is isolated.
 The product has a pre-wired flying lead. Connect the brown core to Live and the blue core to
Neutral.
 Use cable clamps and clips to secure the cable, as appropriate.
Fig. 13.
Fig. 12.
IMPORTANT:
PoziDry Pro Fire Damper (FD) models (e.g.
476312) must be fitted with a smoke alarm
with a relay to ensure compliance with
building regulations.
In order to have the product switch off in the
event of a fire it must be wired using a smoke
alarm with a relay system.
Use Fig.13 as a reference and refer to the
instructions provided by the manufacturer
of the smoke alarm and relay in order to
wire the unit correctly. Ensure the relay
works correctly by testing the fire alarm;
the unit should switch off when the alarm
is sounding.
FOR REFERENCE

10
Boost Switch Link Connector option (Ref:- 411150)
IMPORTANT:
Do not connect mains or any other device to the remote boost cable. It is only intended to
be linked via a remote volt free switch to activate the boost function.
1) Connect the boost cable (supplied with 411150) to the connector under the display (on the
fan).
2) Wire the boost switch to the two terminals within the junction box. Ensure the cable is
secured properly. The switch links the two wires together to activated boost remotely.
Once deactivated the fan overruns for the set timeout period (*see bst timer within the fan
menu).
a. Normally open – normal mode/trickle
b. Closed link – boost is activated.
*Within the fan menu “bst” can be set to have an overrun timer of either 0, 1hr, 2hr, 4hr, 8hr.

11
D. SETUP
START UP SEQUENCE
When the unit is switched on it will first run through a period of system checks. During this time
the display will show various system parameters before the fan motor starts. After 10 seconds the
product will be ready for commissioning.
COMMISSIONING
Accessing the Commissioning Menu
If the fan is powered and the display is not lit then press any button to access the menu. After 30
seconds without menu activity the display will switch off, any changes to the settings will then be
applied.
There are three buttons on the front of the unit:
Menu Structure
+
-
MODE
The + button is used to
increase the value of a setting,
the – button is used to reduce
the value of a setting and the
Mode button moves to the next
menu item

12
Speed Settings
The Lo-Carbon PoziDry Pro has two speed settings, ‘Trickle’ and ‘Energy Recovery’.
 ‘Trickle’ speed is automatically selected when the ambient loft temperature is below the
Trickle Speed Temperature Threshold setting. Default setting is 18°C.
 ‘Energy Recovery’ is automatically selected when the ambient loft temperature is
between the Trickle Speed Temperature (default is 18°C) and Temperature Limit setting
(default is 27°C).
 If the ambient loft temperature exceeds the Temperature Limit setting, the fan
automatically switches to standby (no airflow) - except when Radon Mode is enabled. See
Radon Mode below for more details.
 If the input air is below -5°C the fan will switch to standby.
There are 5 pre-set speeds that can be selected based on number of bedrooms in the property.
For example, setting b03 being for a three bedroom dwelling. Please see Fig.14 for the
approximate flow rates at each setting. Alternatively, the speed settings are also fully adjustable
between 10L/s and 60L/s via the manual speed setting option.
*The table shows a set up representative of a good low resistance installation using the supplied
filters. When F7 filters and/or a long duct run are used it may be necessary to use the manual
speed selection to meet the required flow rate.
Heater Threshold Temperature
This is the temperature at which the heater will switch on. Default is 5°C. The higher the
temperature setting/threshold, the more energy the heater will use. However the lower the
setting, the colder the air will be supplied into the house. The heater modulates (switches on/off)
to maintain the set heater threshold temperature.
Lock feature
The menu lock feature will prevent the unit from being adjusted after commissioning without a
pass code. This can be set in the menu to any 3 digit hexadecimal combination.
If the lock feature is enabled; when a button is pressed the display will show, – – –. At this point
enter the three digit code by first pressing + or – until the first digit is correct then press MODE to
move to the next digit. Repeat until the code is entered and press MODE to enter the
commissioning menu. If the code is entered incorrectly, wait until the screen switches off then
press any button to begin again.
Radon Mode
Radon mode keeps the fan running even at high temperatures to prevent the build-up of
dangerous radon gas in the property. If this is not required, it is recommended not to use this
setting.
Fig.14  Trickle* EnergyRecovery*
No.Bedrooms Setting L/s L/s
1 b01 13 25
2 b02 17 31
3 b03 21 38
4 b04 25 44
5 b05 29 50

13
Trickle Speed Temperature Threshold
The temperature the fan will switch from Energy Recovery Mode to Trickle mode. Usually this
would be set to around 18-20°C to be slightly cooler than the normal heating thermostat
temperature. Default is 18°C.
Temperature Limit
This is the maximum temperature the fan will run until going into standby. The higher the
temperature the more heat will be extracted from the loft. Default is 27°C. Note that this limit is
ignored in radon mode.
Accessing Data Logger Menu
To access the menu of data that the unit stores press and hold the mode button for 5 seconds.
The menu structure is shown below, press mode to move to the next item:
To exit the menu press MODE for 5 seconds or wait for the screen to switch off.
Display: tot run – 0y – 00d
Description: total unit run
time in years and days
Display: hEAt EnErGy - 00
Description: Total energy
consumption of the heater in
kWh
Display: Fan EnErGy - 00
Description: Total energy
consumption of the fan in
Wh
Display: nor run – 0y – 00d
Description: Total time
spent at Energy Recovery
s
p
eed
Display: trI run – 0y – 00d
Description: Total time
spent at trickle speed
5 second press
of Mode

14
E. SERVICING AND MAINTENANCE.
WARNING: THE POSITIVE VENTILATIION UNIT AND ANCILLARY CONTROL
EQUIPMENT MUST BE ISOLATED FROM THE POWER SUPPLY DURING THE
INSTALLATION / OR MAINTENANCE.
The fan motor uses sealed ball bearings, and does not require further lubrication.
Apart from filter change the Lo-Carbon PoziDry Pro contains no user serviceable parts.
Filter: Under normal conditions; i.e. away from main roads and industrial areas, it is
recommended that the filter is checked annually and cleaned or replaced as necessary.
Otherwise change as required. (See Spares part list below)
The filter may be gently cleaned with a vacuum cleaner or washed in a soapy water solution and
allowed to air dry before re-fitting. Do not dry the filter in a tumble dryer.
When re-fitting make sure that the filter is fitted correctly. This will ensure that all the fresh
air entering the dwelling has passed through the filter first.
Below is a list of spares and accessories available for the Pozidry Pro:
Spares and Accessories Part Number
F7 FILTER PACK 477957
1X REPLACEMENT MOUTNING LEG & FOOT 477627
HANGING KIT 477628
REPLACEMENT G4 FILTER PACK 477629
PIV TWIN SPIGOT KIT 449071
200mm DIAMETER 2m FLEXIBLE DUCTING 477748
REPL
A
CEMENT DIFFUSER 477889
REPLACEMENT DIFFUSER FOR FD MODEL 475664
REPLACEMENT MOUNTING FOOT 478000
DIFFUSER ASSEMBY 478228
PURGE BOOST SWITCH LINK CONNECTOR 411150

15
PRODUCT FICHE
For Residential Ventilation Units (Complying Commission Delegated Regulation (EU) No 1254/2014)
Name: Vent‐Axia Vent‐Axia Vent‐Axia
ModelID(StockRef.): Lo‐CarbonPoziDryPro‐
476310
Lo‐CarbonPoziDryPro‐
476311
Lo‐CarbonPoziDryPro‐
476312
SECClass B B B
SECValue('Average') 28.30 28.30 28.30
SECValue('Warm') 12.80 12.80 12.80
SECValue('Cold') 55.36 55.36 55.36
LabelRequired?(Yes/No=Outofscope) No No No
Declaredas:RVUorNRVU/UVUorBVU RVU‐UVU RVU‐UVU RVU‐UVU
SpeedDrive VariableSpeed VariableSpeed VariableSpeed
TypeHRS(Recuperative,Regenerative,None) None None None
ThermalEff:[(%),NA(ifnone)] N/A N/A N/A
Max.FlowRate(m3/h) 198.00 198.00 198.00
Max.PowerInput(W):(@Max.FlowRate) 14.00 14.00 (fan only)
464(fanwithheater)
14.00(fanonly)
464(fanwithheater)
LWA:SoundPowerLevel(dB) 35.53 35.53 35.53
Ref.FlowRate(m3/s) 0.04 0.04 0.04
Ref.PressureDiff.(Pa) N/A N/A N/A
SPI[W/(m3/h)] 0.09 0.09 0.09
ControlFactor&ControlTypology:(CTRL/Typology)   
ControlFactor;CTRL 0.65 0.65 0.65
ControlTypology LocalDemandControl LocalDemandControl LocalDemandControl
Declared:‐MaxInternal&ExternalLeakageRates(%)forBVUsor
carryover(forregenerativeheatexchangersonly),
‐&Ext.LeakageRates(%)forDuctedUVUs;
N/A N/A N/A
MixingRateofNon‐DuctedBVUsnotintendedtobeequippedwith
oneductconnectiononeithersupplyorextractairside; N/A N/A N/A
PositionanddescriptionofvisualfilterwarningforRVUsintended
forusewithfilters,includingtextpointingouttheimportanceof
regularfilterchangesforperformanceandenergyefficiencyofthe
unit
N/A N/A N/A
ForUVUs(InstructionsInstallRegulatedSupply/ExtractGrilles
Façade) InF&W InF&W InF&W
InternetAddress(forDisassemblyInstructions) www.vent‐axia.com www.vent‐axia.com www.vent‐axia.com
Sensitivityp.Variation@+20/‐20Pa:(forNon‐DuctedVus) N/A N/A N/A
AirTightness‐ID/OD‐(m3/h)(forNon‐DuctedVus) N/A N/A N/A
AnnualElectricityConsumption:AEC(kWh/a) 0.46 0.46 0.46
AnnualHeatingSaved:AHS(kWh/a)   
AHS:Average 28.30 28.30 28.30
AHS:Warm 12.80 12.80 12.80
AHS:Cold 55.36 55.36 55.36

16
Disposal
This product should not be disposed of with household waste. Please recycle where facilities exist. Check
with your local authority for recycling advice.
Head Office: Fleming Way, Crawley, West Sussex, RH10 9YX.
EU Authorised Representative: Vent-Axia Sigarenmaker 5 - 5521DJ Eersel Nederland. [e-mail]
UK NATIONAL CALL CENTRE, Newton Road, Crawley, West Sussex, RH10 9JA
SALES ENQUIRIES: Tel: [phone] Fax: [phone]
TECHNICAL SUPPORT: Tel: [phone] Fax: [phone]
For details of the warranty and returns procedure please refer to www.vent-axia.com or write to Vent-Axia
Fleming Way, Crawley, RH10 9YX
476705 P 0223
The Guarantee
Applicable only to products installed and used in the United Kingdom. For details of guarantee outside the United Kingdom contact your local
supplier.
Vent-Axia Guarantees this product for 5 years from date of purchase against faulty material or workmanship. In the event of any part being
found to be defective, the product will be repaired, or at the Company’s option replaced, without charge, provided that the product:-
 Has been installed and used in accordance with the instructions given with each unit.
 Has not been connected to an unsuitable electricity supply. (The correct electricity supply voltage is shown on the product rating
label attached to the unit).
 Has not been subjected to misuse, neglect or damage.
 Has not been modified or repaired by any person not authorised by the company.
IF CLAIMING UNDER TERMS OF GUARANTEE
Please return the complete product, carriage paid to your original supplier or nearest Vent-Axia Centre, by post or personal visit. Please ensure
that it is adequately packed and accompanied by a letter clearly marked “Guarantee Claim” stating the nature of the fault and providing
evidence of date and source of purchase.
The guarantee is offered to you as an extra benefit, and does not affect your legal rights