EnviroVent LoftVent Mk2 PIV Installation Guide

Safety

Read and understand these instructions before beginning installation. The unit should be installed by a competent person.

Location

Check there is space for the unit in your chosen location. The unit must not affect the operation of open-flue appliances. Consult local regulations or a qualified gas engineer.

The open sides of the diffuser must face a minimum 1m unobstructed path away from any smoke detectors. If the diffuser cannot be repositioned, up to two sides can be closed using the plastic blanking plates. In this configuration, the open sides must face a minimum 1.5m unobstructed path away from any smoke detectors.

In properties with a floor above 4.5m, steel diffusers must be fitted a minimum of 1m away from the smoke detectors instead of the included plastic diffusers.

Partition walls between buildings must be complete with any breaks filled.

In properties with a floor more than 4.5m above ground level, the unit must be wired into a smoke alarm; the unit will switch off on detection of smoke (see page 14 for wiring information).

The appliance is considered suitable for use in countries with a warm, damp, equable climate, but may also be used in other countries.

For installation assistance, call: 01423 810 810

Wiring Regulations

All wiring must comply with Building Regulations and the current IET Wiring Regulations (BS7671 in the UK) or equivalent standards for other countries. The final installation should be examined and tested by a qualified electrician.

This product is not suitable for use with a Type AC RCD ⚠️.

Electrical Connection

The unit must be earthed and a suitable isolator with a minimum contact separation of 3.0mm must be used to provide insulation for the unit. The unit must be able to be disconnected from the mains supply after installation. When wiring the unit, the included unswitched fuse spur should be incorporated in the fixed wiring.

The power supply cable running into the unit must remain the supplied flexible cable (not a solid core lighting cable). If the power supply cable becomes damaged, it must be replaced by EnviroVent, an authorised service agent for your region/country, or a similarly qualified person in order to avoid a hazard. Do not remove or tamper with any electronic components inside the product.

Users

The unit is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities or lack of experience and knowledge, unless they have been given supervision and usage instruction by a person responsible for their safety. Children should be supervised to ensure they do not play with the unit. Cleaning and user maintenance must not be performed by children.

Diagrams

PIV Unit Dimensions

Diagrams of the PIV unit. Top view shows a square unit with a circular diffuser outlet (Ø200 mm) on top. Side view shows the unit's dimensions: 406 mm width and 373 mm height.

Filter and Keypad

Filter Access

Diagram showing the filter access panel on the side of the unit, with an arrow indicating it can be opened.

Keypad Functions

Diagram of the keypad with numbered buttons (1-10) corresponding to:

• 1 - Airflow 1
• 2 - Airflow 2
• 3 - Airflow 3
• 4 - Airflow 4
• 5 - Temperature <19°C
• 6 - Temperature >19°C
• 7 - Temperature >25°C
• 8 - Top button
• 9 - Numeric Display
• 10 - Bottom button

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Wiring

Main Wiring Diagram

Wiring diagram illustrating the connection between the Ventilation Unit, a Local Isolator, and the Mains Supply (230V 50/60Hz). It shows the N, L, and E connections.

Wiring Steps

1. Step 1: Remove base cap (two screws).
2. Step 2: Make small hole in grommet and thread 2-core cable through.
3. Step 3: Wire in 2-core cable. Shows blue wires and red wires, with a label for 'Heater enable Volt free connection'.
4. Step 4: Replace base cap (two screws).

The local isolator must be connected to the mains as part of the fixed wiring. Connect the N, L and E cores of the power cable to the matching terminals on the local isolator.

For installation assistance, call: 01423 810 810

PIV Box Contents

• 1x PIV unit
• 1x 200mm diffuser (+ 2x blanking plates)
• 1x Instruction guide
• 1x Diffuser mounting template
• 1x Flexible duct (1m x 200mm dia.)
• 1x Unswitched fuse spur
• 8x Foam pads
• 4x Washers
• 4x Screws 10g x 3"
• 4x Screws 10g x 1.5"
• 4x Screws 8g x 1.5"
• 4x Screws 8g x 1"
• 4x Plasterboard plugs
• 1x Roll of fixing tape

Pre-Installation Checklist

• Does the unit fit through the loft hatch?
• Check there are no obstructions in the hallway or landing where the diffuser is to be fitted and in the loft space above.
• Ensure the loft has adequate cross-flow ventilation to provide a supply of fresh air to the unit.
• Check that all partition walls are intact. Seek building advice if any are missing or broken.
• Check for flued appliances drawing air from the loft; the user should be made aware of any of these.
• Check that any flue passing through the loft is undamaged. Seek building advice if any are damaged or broken.
• Repair any ceiling gaps which allow air leakage into the loft.
• Ensure any loft water storage tanks are covered and sealed.

About PIV

Positive Input Ventilation (PIV) units create fresh and healthy living environments by supplying filtered air into a property at a continuous rate through ceiling-mounted diffusers. The diffusers are normally installed in a hallway or landing area.

The units have been developed to improve indoor air quality and resolve condensation and mould problems and are designed to operate for 3 years with no requirement for maintenance other than replacement of the filter. It is recommended that the filters are checked regularly and replaced when required. If there are very high amounts of particulate matter in the air and loft space, the filter will need to be replaced more frequently.

PIV Unit Operation

In conditions between 19°C - 25°C, the units will increase air flow rate by 10%. In hot conditions above 25°C, the units will temporarily switch off to avoid bringing hot air into the property from the loft space.

The PIV Unit uses a single 200mm diffuser to provide air into a hallway or landing area.

Installation Procedure

Step 1-3: Preparing the Ceiling

1. Place a dust sheet below the required ceiling diffuser position and check the ceiling below and loft space above are unobstructed.
2. For PIV, mark a 222mm diffuser hole using the template.
3. Wearing a dust mask and eye protection, cut out the hole/s.

Step 4: Mounting the Unit

1. 4a. Screw the feet of the unit onto two 25mm x 50mm wood battens using the four 10g x 1.5" screws. (Battens not supplied).
2. 4b. Position the unit with anti-vibration pads and washers onto the loft ceiling joists as shown in the diagram.
3. 4c. Screw the battens to the ceiling joists using the four 10g x 3" screws.
4. 4d. If the loft insulation sits above the joists and impedes the unit, create a raised wooden platform to mount onto.

Step 5-8: Connecting the Diffuser and Ducting

1. Insert the diffuser spigot into the ceiling hole so that the diffuser outlets face towards the walls, then mark the four fixing holes.
2. Attach the duct to the spigot of the diffuser and seal the connection using the fixings supplied.
3. Insert the diffuser spigot into the hole then fix it in place. Use the four plasterboard plugs and four 8g x 1.5" screws. Then clip the diffuser cover into the diffuser spigot.
4. Attach the flexible duct to the spigot on the unit and ensure it is pulled taut. Seal the connection tightly using the fixings supplied. Cut the duct to length if required.

Step 9-12: Electrical Connections and Testing

1. With the mains supply isolated, wire the power cable into the unswitched fuse spur, then wire the unswitched fuse spur into the mains supply (refer to wiring diagram on page 5). Use two of the 8g x 1" screws to attach the spur to a loft joist.
2. The unit can be wired to a heater enable switch (not included). Wire into the connection located under the unit (see Page 5, cable not included) and fit it in an accessible area. Do NOT wire into mains or any other power source. Use two of the 8g x 1" screws to attach the switch to the wall.
3. Reconnect the electrical supply to the unit. Air should begin to flow from the diffuser. Press button 1 to show the current air flow rate.
4. Further presses will cycle through the air flow rate settings.

For installation assistance, call: 01423 810 810

Fire Safety

Fire Kits

For installations with a floor more than 4.5m above ground, a compatible fire kit must be fitted. The kits listed below contain all the extra parts and instructions required:

Smoke Alarms

For installations with a floor more than 4.5m above ground, the unit should be wired into a smoke alarm to switch the unit off upon detection of smoke. A smoke alarm kit is available using order code 1ACSMOKEALARM-KIT. The unit can also be wired into an existing smoke alarm (check compatibility with the smoke alarm manufacturer). All wiring should be completed by a competent person.

To test the installation, press the TEST button on top of the smoke alarm and keep it pressed until the PIV unit switches off (LEDs on the board go out).

Smoke Alarm Wiring Diagram

Diagram illustrating the complete smoke alarm wiring setup, connecting the Ventilation Unit, Local Isolator, and a Linked Smoke Alarm to the Mains Supply.

Energy Usage and Airflow Performance

^a Diffuser installed without blanking plates fitted.

^b Power usage shown with comfort heater function disabled.

Running Costs

Scan our QR code or visit envirovent.com/annual-running-costs to see the annual running costs of this product.

For installation assistance, call: 01423 810 810

Spares/Accessories

*Additional two core cable required. **Additional four core cable required.

Maintenance

The LV2-EVL and LV2-EVL-H units are designed to operate for 3 years before requiring a full service. Filters should be checked regularly and replaced when required.

If there are very high amounts of particulate matter in the air and loft space, the filter will need to be replaced more frequently.

Warranty

EnviroVent appreciates your choice of this quality product, designed and manufactured to the highest specification in Harrogate, North Yorkshire. The performance of the system and the resulting improvement in air quality are expected to delight users.

This unit is covered by a full 3-year warranty. Maintenance is limited to filter replacement after 3 years and general cleaning.

The warranty covers defects or breakdowns arising from faulty materials or construction. A receipt is required as proof of purchase. Units or parts (including filters) bought from unapproved sources, including auction websites, are not covered by this warranty.

The warranty does not cover labour costs.

Your unit serial number: _________________________

For warranty conditions and exclusions, visit www.envirovent.com/warranty.

What should I do if I have a problem?

Do not dismantle or remove any parts of the unit other than those instructed in this guide. Tampering with the unit will void the warranty. For further assistance, please call 01423 810 810.