3
5.3.1 Access to terminal box
• Unscrew the four screws of the plate
cover (1).
• Remove, turn, and fixate the cover (2).
Keep the terminal box attached to the
plate cover.
6. Start-up
6.1 Approval (before start)
When the jet fans have been mounted
and are serviceable their function,
correct installation, and interaction must
be established through an approval test.
The person responsible for the operation
of the system must take initiative for this
test
The approval test must be documented
and kept by the person responsible for
the operation of the system and must be
presented on demand if it concerns jet
fans approved for smoke control.
Before startup, check that the fans are
clean and free from tools and foreign
substances and that the impellers rotate
freely.
Check also that the electrical connection
complies with current regulations and
that the wire guard of the inlet nozzles
and the deflector in the outlet are
installed properly.
The fan rotation direction is checked
after a brief start. Refer to the arrow signs
on the side of the fan.
Note, that during the first 30 minutes of
operation the motor may consume more
power than stated on the motor plate.
Also, the amp consumption depends on
the temperature.
6.2 Start procedure
Start procedure
1 Start the fan
2 Check for irregular sounds
3 Check after 30 minutes that the fan
functions correctly.
7. Maintenance
The user must always keep the jet fans in
good working order.
To ensure functionality and life of the
fans the following must be observed.
7.1 Safety measures
Ensure that unintentional activation is
impossible. Cut, for instance, the power
in the fuse box or use another centrally
placed power switch. Fans with
automatic control may suddenly start
unless the power supply is disconnected.
7.2 Maintenance of fans
7.2.1 CO fans
For fans used for CO ventilation yearly
inspection and check of functionality is
recommended.
7.2.2 Smoke control fans
Fans approved for smoke control and
used for ventilation on a daily basis,
must be inspected every six months.
Fans that are only used in case of fire
must be inspected 4 times per year.
It is important to comply with the motor
supplier's guidelines for maintenance.
7.3 Cleaning
Clean the cabinet, outlet, motor, inlet and
wire guard with a wet cloth. A vacuum
cleaner fitted with a brush or pressurised
air may also be useful, depending on the
kind of filth that have settled on the fan
unit.
The motor and inlet areas require the
motor and fan wheel arrangement to be
taken down and disassembled. Remove
the motor to clean the inlet nozzle. It is
recommended to leave the wire guard on
the inlet nozzle, as it is riveted to the
nozzle. See section “7.6 Disassembly of
motor”.
See section “7.7 Assembly of motor” for
reassembly instructions.
7.4 Vibrations
The fan is factory-balanced to minimise
vibrations during operation. If
vibrations occur it normally indicates
accumulation of dust and dirt on the
rotor system. If the problem remains
after ordinary cleaning, please contact
professional assistance. Continuous
operation with vibrations may damage
both motor bearings and impeller.
Check the vibration dampers in the
suspension brackets for ruptures and
replace the dampers at signs of ruptures.
7.5 Motor
The motor has closed bearings that
should be changed in accordance with
the motor supplier's recommendations.
7.6 Disassembly of motor
Before start, follow the procedure in
section “7.1 Safety measures”.
Novenco recommends the use of a lift
and that only the motor arrangement is
taken down and instead of the entire fan
unit.
Procedure for dismounting
1 Loosen the external motor cable
connector.
2 Remove the terminal box cover plate
and take out the terminal box. Turn
and affix the cover with a single screw
Figure 6.
Access to terminal box
Important:
The fan is designed for
continuous operation.
The following kinds of
operation may cause
fatigue break in the
impeller and endanger
people.
•
Operation in stall area -
Operation with
pulsating counter
pressure - called pump
mode
•
Operation with
repeated starting and
stopping
•
Uneven flow velocity
through fan
If in doubt Novenco
should be contacted to
assess fan suitability.
1
2
Important:
Shut off and disconnect
the fan power supply
before beginning any
work or cleaning on the
fans.
Important:
Do not use high-pressure
water cleaning.
