Vent-Axia Lo-Carbon PoziDry Pro 476310 Assembly instructions

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH THE ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS
Lo-Carbon
PoziDry Pro
Pos
itive 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

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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.
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.

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•The fan will run in ‘Energy recovery’ speed when the ambient loft temperature is between 18 and 27°C.
•If the ambient loft temperature exceeds 27°C, the fan will automatically switch to standby (no airflow).
•The heater (if applicable) will activate when the ambient loft temperature is below the set point (default is
5°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.
•Remote Purge/Boost is achievable by using the Boost Switch Link Connector (sold separately –411150).
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
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.1.

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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.
Fig. 3.
Fig.2.
Filters
(See pg. 8)
Fig. 4.

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400-600mm Joist Dimensions with Unit Clearance Heights
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.

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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. 7.
Fig. 8
: Apply worm drive clips provided
in positions shown

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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.

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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 ONLY

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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.

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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

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Speed Settings
The Lo-Carbon PoziDry Pro has three speed settings, ‘Trickle’, ‘Energy Recovery’ and ‘Purge’.
•‘Trickle’ speed is automatically selected when the ambient loft temperature is below 18°C.
•‘Energy Recovery’ is automatically selected when the ambient loft temperature is between 18°C and 27°C.
•If the ambient loft temperature exceeds 27°C, the Lo-Carbon PoziDry Pro automatically switches to standby
(no airflow) - except when Radon Mode is enabled. See Radon Mode below for more details.
•‘Purge’boosts the fan to max speed for the time the remote switch is active, plus the set overrun time (once
deactivated).
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.14for 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 PoziDry Pro must be set to provide adequate ventilation
according to Part F of the building regulations.
*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.
Lock feature
The menu lock feature will prevent the unit from being adjusted after commissioning as a pass code is required to
access the menu. 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.
Trickle Speed Threshold
By reducing the trickle speed threshold the fan will run at higher speed more often (in Energy Recovery Mode), this
would be helpful in a property with persistent damp problems. However will introduce the colder air at a higher rate.
Temperature Limit
Increasing the temperature limit will mean the fan will continue to run at higher temperatures, 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.
Fig.14Trickle*
Energy
Recovery*
No. Bedrooms
L/s
L/s
1
13
25
2
17
31
3
21
38
4
25
44
5
29
50
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
speed
Display: trI run – 0y – 00d
Description: Total time
spent at trickle speed
5 second press
of Mode

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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
REPLACEMENT DIFFUSER
477889
REPLACEMENT DIFFUSER FOR FD MODEL
475664
REPLACEMENT MOUNTING FOOT
478000
DIFFUSER ASSEMBY
478228
PURGE BOOST SWITCH LINK CONNECTOR
411150

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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 o
f 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, incl
uding text pointing out the importance of
regular filter changes for performance and energy efficie
ncy 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

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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 Bedrijvenweg 17 7442 CX Nijverdal 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 N 1022
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, (7 year warranty if purchased and installed by a recommended contractor)
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