Installation and Maintenance
DUCTMASTER BIFURCATED
4
Accessory Installation
Flexible Connections - Care must be taken when
installing flexible connections to ensure that duct mis-
alignment is not corrected by the flexible connection.
Both duct misalignment and slack connections cause
unnecessary pressure losses in the system.
Anti-Vibration Mountings - Anti-vibration mounts
cannot be fitted to a fan unless there are flexible
connectors between the fan or fan silencer combination
casing and the ducting. On combination fan/silencer
installations only four foot mountings are used, see
fixing details on page 9.
Suspension mounts in particular should be adjusted on
the drop rods to carry an equal proportion of the total
fan weight when installed, as unevenly adjusted
mountings could carry a load greater than the design
condition.
Anti-Backdraught Dampers - Anti-Backdraught
Damper should be checked for transit damage prior to
installation. Damper blades should be open and closed
to ensure smooth operation.
Maintenance
Maintenance
NuAire recommends all products maintained in accor-
dance with the HVCA “Standard Maintenance
Specification for Mechanical Services in Buildings” -
Volume II Ventilating and Air Conditioning.
For guidance only
Due to the different periods of operation from the time
of installation and conditions of use, no rigid inspec-
tion and maintenance periods can be recommended.
We suggest,
therefore that the inspection and if necessary cleaning /
bearing check should be carried out at regular intervals
of a maximum of six months.
For a routine inspection, check the tightness of all nuts,
keys, grubscrews and endbolts etc. Remove any build
up of dirt or dust with a brush.
Connection details
Check that the voltage on the fan rating label is suitable
for your supply. Full load / starting currents are also
indicated.
The fan unit incorporates a terminal box on the motor
exterior. Units for external use require weatherproof
conduit and glands.
Motors up to and including 3kW are designed for Direct
On Line starting. Motors with outputs of 4kW and above
are suitable for Direct On Line or Star/Delta starting.
Flameproof motors are generally supplied for wiring
and connection, direct to the motor terminals, on site
by the installer (special wiring instructions must be
provided by NuAire). Connections and fittings used
must be in accordance with current BASEEFA approved
standards and requirements.
Motor overload protection should be set to the full load
current on the fan rating label. Supply fuses should be
H.R.C. type.
Start up procedure
When starting ensure that the impeller rotation follows
the label arrow indicator on the casing. Should the
direction be incorrect on three phase units, reverse any
two of the supply leads. See wiring diagrams pages 10.
(Do not reverse the impeller direction permanently).
Equipment should be run for approximately 30 minutes
to ensure correct operation. If any fault occurs, the
equipment should be switched off. Do not re-start until
the fault has been rectified.
Summary of Contents for DuctMaster DCB 315
Page 16: ...16...
