Flexit L12 X, Operating Instructions Manual

7

3  Installation

the unit is designed for indoor installation.

3.1  Inspection/Maintenance

The unit must be installed with space for service and 

maintenance such as filter replacement and cleaning 

the fans and exchanger. It is also important for the unit 

to be located so that the electrical cabinet is easily ac-

cessible for electrical connection, troubleshooting and 
future component replacement.

3.2   Space Required

Type

A

B

L12

550 mm

400 mm

L18

1000 mm

500 mm

L20

1000 mm

500 mm

L30

1000 mm

500 mm

L50

1400 mm

100 mm

See the separate dimensioned drawing for connection 

of the water battery (pipe location), Chap. 2.3.

These are minimum requirements that only take service 

needs into account. If other statutory requirements re-

quire a greater distance, they must be complied with, for 

example for electrical safety.

3.3   technical Room Requirements

The unit must be placed in a separate technical room 

with a gully. Ceiling/floor/walls/doors must be in the 
necessary fire class.

3.4   Recommended Sound Absorption and 

Sound transfer

The main silencers must be placed near the unit, prefer-

ably in the technical room.

The unit should be placed by a wall that has no room on 

the other side that is sensitive to noise. The unit should 

not be less than 400 mm from the wall. If the unit is 

placed against a wall, low-frequency sound may create 

vibrations in the wall.  

Sound may also be transferred through the floor if the 

mass and rigidity of the floor are not sufficient. 

Technical rooms should be fitted with floating concrete 
floors to prevent sound transfer on account of vibration.

When installing the unit, fabric bosses must be fitted be-

tween the unit and the duct system. It is also important 
for the unit not to bear the weight of the ducts.

Busbars or water pipes must not prevent the unit from 
moving freely on the vibration dampers.

3.5  Air Intake/exhaust

The distance between the air intake and air exhaust must 

be so great that air circulation is prevented.

The fresh air intake must be placed away from traf-

fic/smoke/dust/walls exposed to the sun. The air intake 

should be placed min. 1 m above ground level to reduce 

the risk of clogging with snow and leaves. When design-

ing the intake/exhaust chambers, it is necessary to take 

drainage into account. 

Follow the suppliers’ recommendations for max./min. air 
flow rates through the intake/exhaust gratings/roof hats.

3.6   Stop Damper in Air Intake/exhaust  

(Accessory)

Used to prevent self-ventilation when the unit is 

stopped.

Must always be used in systems with water batteries as 
protection against frost.

B

A

Fig. 8