Vent-Axia PoziDry Pro Assembly instructions

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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

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

(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.

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

. 8

)

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.

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.

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

ositions shown

Fig. 7.

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.

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

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.

This manual suits for next models

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