Fan Drainage Piping And Trap Detail; Bases (Foundation And Isolation) - Greenheck USF-200 Installation, Operation & Maintenance Manual

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 are 1.0 inch MNPT
• 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 on Centrifugal Fan Housing
Connect
this end
to fan drain.
H
H/2
FAN OFF
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.
®
1.25 inch
minimum
N
H/2
FAN ON

Bases (Foundation and Isolation)

Critical to every fan installation is a strong, level
foundation. A reinforced poured concrete pad with
a steel base or inertia base provides an excellent
foundation. 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 Greenheck). 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
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
Greenheck 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.
Utility and Centrifugal Fans 7