7
Spacer
Nut
Rubber Vibration
Damper
Nut with
Locknut
Example 2
Rubber Vibration
Damper
Nut
Spacer
Nut
Spacer
Example 1
Fig. 3. Unit Installation
For best performance provide a straight section of air duct at least 1 m long on each side while
installing the unit.
The unit must be equipped with a grill or other device (maximum mesh size - 12.5 mm) to prevent
free access to the fans.
SAFETY REQUIREMENTS
The unit must be mounted on a rigid and stable substructure.
Suspend the unit with bolts. Make sure that the mating structure can withstand the weight of the
block.
If necessary, reinforce the installation area with beams etc., and then install the suspension bolts.
Insufficient strength of the structure used for the installation may resonate in response to the
block vibrations resulting in noise.
Always arrange for a maintenance zone and an access hole in the ceiling for inspection of the
filters, heat exchanger and fans.
Provide a separate access hole for each unit - see more details on the outline drawing (Fig. 1).
Prior to installation make sure that the ambient conditions are suitable for the unit operation.
Insufficient length of the mounting bolts to be used for attaching the unit to the ceiling may cause
abnormal noise due to resonance with the ceiling.
To prevent resonance use sufficiently long bolts.
If the abnormal noise is generated at the coiled duct mating replace the coiled duct with a flexible
line, or, alternatively, use flexible inserts to eliminate resonance.
