Safety precautions:
In a oor-mounted conguration the unit must be provided with a rigid and stable base structure (the technical characteristics
and unit weight specications are given in the technical parameters table).
To x the unit to the oor use anchor bolts. Make sure that the base structure is capable of sustaining the unit weight. Other-
wise reinforce the mounting location with beams or similar elements.
To x the unit to the ceiling use anchor bolts. The insucient strength of fastening system causes resonance with the vibra-
tions generated by the unit which, in turn, results in unwanted noise.
Therefore, arrange a maintenance area and an inspection hole for air lter, heat exchanger and fan service in consideration of
the unit overall dimensions (see page 6). Provide an inspection hole for each unit.
Install M8 anchor bolts before proceeding with the installation. Insert the anchor bolt into the ceiling mounting opening and
secure it with nuts and washers.
Prior to commencing the installation check the unit casing for any left-over foreign objects such as plastic lm or paper.
The lack of length in the anchor bolts used for the unit installation may cause abnormal noise resulting from resonance with
the natural vibrations of the ceiling.
If the abnormal noise is generated at the spiral air duct joint replace the spiral air duct with a exible one to prevent resonance.
Flexible anti-vibration connectors are another alternative for dealing with resonance. To ensure the best performance of the
unit provide a straight duct section on both sides of the unit at least 1 m in length.
The unit must be equipped with a grille with the minimum cell diameter of 12.5 mm or a similar protective device preventing
free access to the fans.
P31300 MECHANICAL SPEED SWITCH INSTALLATION:
MAKES SURE THAT THE SWITCH IS INTACT. DO NOT USE DAMAGED SWITCHES.
DO NOT MOUNT THE SWITCH ONTO AN UNEVEN SURFACE. WHILE TIGHTEN
ING THE SELFTAPPING SCREWS DO NOT APPLY EXCESSIVE FORCE TO PREVENT
SWITCH CASING DEFORMATION.
The speed switch is part of the unit delivery set and is factory-connected to the terminal block located inside the unit control box according
the wiring diagram (see Fig.“Wiring diagram”).
Route all the necessary cables and wires to the switch tting location.
Install the mounting box (not included in the delivery set) into the wall.
Disassemble the switch and disconnect the connected wires.
