Centrifugal, Industrial and Filtered Supply
6
CAUTION
When installing a fan, ensure the proper protective
devices are used to protect personnel from moving
parts and other hazards. A complete line of protective
accessories are available from the manufacturer
including: inlet guards, outlet guards, belt guards,
shaft guards, protective cages and electrical
disconnects.
Electrical Disconnects
All fan motors should have disconnects located in
close visual proximity to turn off electrical service.
Service disconnects shall be locked out when
maintenance is being performed.
Moving Parts
All moving parts must have guards to protect
personnel. Refer to local codes for requirements as to
the number, type and design. Fully secure fan wheel
before performing any maintenance. The fan wheel
may start “free wheeling” even if all electrical power
has been disconnected. Before the initial start-up or
any restart, check the guards (belt, shaft, inlet and
outlet) and check the access doors to ensure that
they are installed and secure.
Bases (Foundation and Isolation)
Critical to every fan installation is a strong, level
foundation. A reinforced poured concrete pad with
a structural steel base or inertia base provides an
excellent foundation. Structural bases must be sturdy
enough, with welded construction, to prevent flexing
and vibration.
To eliminate vibration and noise from being transferred
to the building, vibration isolators should be used. The
fan is mounted directly on the isolation base and must
be supported for the entire length of the fan base angle
(Refer to the Centrifugal Fan Isolation Base Assembly
Instructions if the base was supplied by manufacturer).
Isolators are installed between the isolation base and
the foundation.
After the fan, isolation base, and isolators are installed,
the entire assembly
must be leveled.
Position the level on
the isolation base,
not the fan shaft,
for proper leveling.
Additionally, the
motor and fan
shafts must be
level and parallel
relative to each
other for proper
alignment.
Typical Fan on Isolation Base
Fan Drainage Piping and Trap Detail
(by others)
Fans may have been supplied with an optional drain.
Drains are located at the underside of the scroll housing.
The drain may need to be connected to a drainage
system to ensure proper disposal of any water or
condensate that may occur.
•
Drain connections with and without a plug are
1 inch (
25.4 mm
)
•
Installed piping to have a downward angle to allow
for drainage.
•
Fill traps to recommended level before start-up.
Note: A conservative method of trap design is to set
N = total static pressure.
Positive Pressure Trap
N = Negative fan pressure (inches W.C.)
H = N - 0.5 inches minimum
Check local codes for proper disposal of drain water
which has been in contact with the exhaust air.
Fans used for grease exhaust need to be equipped with
a separate grease collector.
Drain Options
IP
None
Without plug
AFDW / BIDW
None
With plug
LSF
None
H/2
H/2
H
1.25 inch
minimum
N
FAN ON
FAN OFF
Connect
this end
to fan drain.
