Mounting the ventilation unit to the ceiling

Vallox 125 MV units (excluding model B) can be equipped with an optional ceiling mounting plate.

NOTE:
The ventilation unit is very heavy. Do not perform this procedure alone. Use appropriate lifting equipment, where necessary.


  1. Fasten the M8 thread bars on the rafter frames or other frame structure and fasten the nuts onto the bars.
  2. Lift the ceiling mounting plate in place.
  3. Push a rubber damper and a washer to each thread bar.
  4. Adjust the nuts so that the ceiling mounting plate is level.
    NOTE:
    The end of the thread bar must be 5 mm or less below the fastening nut. Do not fasten the ceiling mounting plate too tight to the ceiling. There must be nuts above the ceiling mounting plate to prevent the plate from lifting up when the unit is being mounted. Check that the sliding bars move and return to their original position by turning the operating levers (A) to the open position and then back to the closed position.

    The upper edge of the ceiling mounting plate can be installed against the ceiling. Alternatively, a concealed mounting method can be used, in which case the ceiling can be 30 mm below the upper edge.

  5. Check that the condensate insulation rings (at least exhaust air and outdoor air duct) are in place in the outlet collars below the ceiling mounting plate.
  6. Pull out the operating levers (A) (figure 1) and turn them towards the outer sides of the plate so that they are secured in the open position (figure 2).
  7. Remove the ventilation unit's door before installing the ventilation unit to the ceiling mounting plate.
  8. Lift the ventilation unit close to the ceiling mounting plate and feed the cables and the connection box through the hole in the ceiling mounting plate on top of the ceiling.
    NOTE:
    Remember to make a maintenance hatch in the ceiling so that the cables and the connection box can be accessed. The distance between the maintenance hatch and the ceiling mounting plate should be around 500 mm.

    Alternatively, the cables can be fed between the ceiling mounting plate and the ventilation unit to the rear wall.

  9. Lift the ventilation unit up against the ceiling mounting plate (figure 3). Where needed, guide the mounting hooks on the ceiling mounting plate (3B) to the grooves on the side panels of the ventilation unit. Turn the operating levers back to the closed position (figure 4). The levers will lock the unit to the ceiling mounting plate (figure 5). When the operating levers are in the closed position and the unit has been secured to the ceiling mounting plate, the levers should be level with the front edge of the ceiling mounting plate.
  10. Where required, the unit can be detached from the ceiling mounting plate. Remove the door of the unit, lift the unit slightly upwards, pull out both operating levers (A) (figure 1) and and turn them towards the outer sides of the plate so that they are secured in the open position (figure 2).
    NOTE:
    Tighten the upper nut of the thread bars adequately so that the ceiling mounting plate cannot rise upwards.

Attic floor feedthrough plate

The top panel feedthrough plate is an optional accessory. When an attic floor penetration plate is used the tightness of the vapour barrier has to be ensured.

The attic floor penetration plate is installed at the same level as the rear wall of the ventilation unit. The minimum distance of the attic floor penetration plate from the rear wall is 10 mm, and the width varies depending on the model. Follow the model-specific instructions on the penetration plate.