“MERCOR” SA
– The company reserves the right to modify and change the document
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7.2. Location and assembly_______________________________________________________
The mcr Bora fan is designed for horizontal installation. Prior to installation of the fan, verify the load
bearing capacity of the ceiling or other structural element where the equipment is to be suspended. Use
the mounting frame (part of the fan itself) or the fasteners supplied with the fan. Using the above
mentioned element, the device is fitted to the structural elements using bolts or using hangers (not
supplied).
Fan due to his construction, does not require vibration isolation between the structural elements and the
device. In case of demanded by bulining project assembly by means of vibration insolation, the
manufacturer recommend to instal the device according to drawing 2. Other assembly may be provided,
providing that the device is safe and undisturbed, in normal operation and fire condtions. Screws,
anchors, suspensions (diameter, length) and other assembly elements must be selected for the size of
the device and the required fire resistane.
Drawing 2 Example illustrating how to install the mcr Bora with
vibration isolation elements.
7.3. Electrical connections_____________________________________________________
Having properly located, placed and fastened the smoke exhaust fan, connect the equipment to the
relevant electrical system wiring. Lead the wiring through the gland and into the terminal box on the fan
casing; then connect the wiring to the terminals in accordance with the diagram shown in the box. The
electrical wire with the proper fire resistance rating is installed in standard by the manufacturer between
the fan motor and the terminal box. Each fan motor must be connected to the electrical power system
through an overcurrent switch. The safety level must be set in accordance with the nominal current draw
of the fan motor. The protective earth shall be made in accordance with relevant electrical engineering
standards.
Once the smoke exhaust fan has been commissioned as a part of the system, measure the current draw
and verify that it meets the motor rating plate data. The smoke exhaust fan current draw in steady
operation must not exceed 1.1 times the rated current.
The electrical power supply from the control cabinet to the fan power junction box must guarantee
uninterrupted operation in the case of a fire. This can be achieved with high temperature resistant wiring
or with protective tubing and proper safe routing of the electrical power system. No external
service/maintenance switches are to used, which is to prevent inadvertent shutdown of the smoke
exhaust fan (with the sole exception of the fan-dedicated service switch with remote indication of current
circuit switching). The smoke exhaust fan control cabinets must be powered directly from main
switchboards with guaranteed uninterrupted power supply, even if the entire building is cut off from the
power grid. If a main fireman's switch is installed to isolate power from the entire building, the smoke
