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MUB (Multibox) Series
Installation instructions
Systemair
General
MUB (multibox) units are specifically designed for inline applications. They
are driven by high efficiency, energy saving electronically commutated
external rotor motors. MUB fans are available in 3 models (16, 20 & 24)
capable of performances up to 6000 cfm (2830 L/s).
Safety Information
All fans are intended for transportation of air in air handling systems. They
are meant to be used after installing them into machines or duct systems
or after a contact protection grid has been installed. No moving parts shall
be accessible after installation. The fans are not to be used in hazardous
environments or connected to flue ducts. The fans must not be installed
outdoors. Safety accessories (i.e. motor protection, safety grille) may not
be dismounted, short cut or disconnected. CAUTION Before servicing or
maintenance, switch off power (all-pole circuit breaker) and make sure the
impeller has come to a standstill. CAUTION The fans can have sharp edges
and corners which may cause injuries.
Your ventilation system should be installed in conformance with the
appropriate provincial or state requirements or in the absence of such
requirements with the current edition of the National Building Code, and /
or ASHRAE’s “ Good Engineering Practices”.
Receiving & Inspection of Units
Upon receipt of the unit(s) on the job site, inspect the unit for shipping
damage. Open all access panels and inspect the interior and exterior.
If any damage exists, do not accept the shipment without written
acknowledgement of the damages by the shipper. Report damage to the
carrier and to your supplier immediately. Note type of damage on copy of
Bill of Lading.
Transportation and Storage
All fans are packaged at the factory to withstand normal transport handling.
When handling the goods, use suitable lifting equipment in order to avoid
damage to fans and personnel. Do not lift the fans by the connecting cable,
connection box, impeller or inlet cone. Store the fans in a dry place protected
from weather and dirt until final installation, as changes in temperature can
cause condensation in the unit.
Installation
Refer to Safety Information above. Installation, electrical connection and
commissioning are only to be carried out by authorised personnel and in
accordance with local requirements and laws. Electrical connections should
be wired according to the wiring diagram in the terminal box, markings
on terminal blocks or on cable. CAUTION Do not use metal compression
gland fittings with plastic terminal boxes. Use a dummy plug seal for the
compression gland fitting as well. Fans with thermal contacts with external
leads (TK) must always be connected to external motor protection. Assemble
the fan in the direction of airflow (see arrow on unit's nameplate). Ensure
that there is a distance of at least 2.5 times the wheel diameter between
the inlet/outlet and any elbows or transitions in the duct. The fan must be
installed so that vibrations are not transmitted to duct systems or frame of
building. Make sure the assembly of the fan is firmly fixed and stable. The
fan can be mounted in any direction unless stated otherwise (See Figure
2). The fans must be assembled so that service and maintenance can be
performed easily and safely. Disturbing noise can be avoided by installing
silencer (available accessory).
Mounting
Prepare the surface where the unit is to be mounted. Make sure that the
surface is flat, level, and that it supports the weight of the unit. Perform the
installation in accordance with local rules and regulations.
Suggested
mounting method
Operation
Before initial operation, check the following:
• Electrical wiring has been properly completed.
• Fan is connected to the proper voltage and amperage (as per nameplate).
• Electrical protection (fuses, breakers) have been properly sized and installed.
• Electrical box cover has been installed.
• Safety devices in place (protection grid)
• Packaging materials and foreign materials have been removed from
the casing.
• While the power is turned OFF, manually rotate the fan to verify that
there is no rubbing against the motor casing.
• For AC models, verify that fan rotation follows the arrow as shown on
the unit's nameplate. If the fan is rotating in the wrong direction, use
the following procedure:
- For single phase units, rewire the motor per the instructions on the
motor.
- For three phase units, interchanges any two power leads.
• Turn on the unit and adjust the unit to the desired speed using the
potentiometer on the side of the electrical box.
When putting into operation, check the following:
• That the motor protection is functional.
• Smoothness of motor operation (no abnormal noises).
Maintenance, Service and Repair
Before maintenance, service or repair make sure that:
• Power supply is disconnected and locked out (all-pole circuit breaker).
• Fan impeller has come to a complete standstill
• Observe personnel safety regulations!
The fan should be cleaned when necessary (at least once per year) to
avoid imbalance and unnecessary damage to the bearings. A filter will
prolong the time interval between each cleaning of the fan. (It is sometimes
recommended to install a filter guard). Do not use a high-pressure cleaner
(steam jet) when cleaning the fan. Make sure the fan impeller’s balance
weights are not moved or the fan impeller distorted. Listen for abnormal
operating noise.
Thermal Overload Protection
Automatic thermal trips reset themselves after the motor has cooled.
Make sure the fan has not been blocked or that the motor protection has
not tripped. Contact the supplier if the motor does not start after cooling.
