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Installation of UL/cUL 762 Listed
Fans for Restaurant Exhaust
The UL/cUL 762 listing for restaurant exhaust is
available on the USF-300 and 400 and CSW.
UL/cUL 762 fans are listed for a maximum operating
temperature of 375°F (191°C) and includes an access
door and 1 inch (25.4 mm) drain connection. An
outlet guard is strongly recommended when the fan
discharge is accessible. An upblast discharge is
recommended. The fan discharge must be a minimum
of 40 inches (1016 mm) above the roof line and the
exhaust duct must be fully welded to a distance of
18 inches (457 mm) above the roof surface.
Upblast Discharge
Optional Companion
Flange
40 in.**
Weatherhood
(1016 mm)
**Per NFPA 96 the fan discharge must
be a minimum of 40 in. (1016 mm)
above the roof surface.
This drawing is for dimensional information only. See the latest edition
of NFPA 96 Standard for Ventilation Control and Fire Protection of
Commercial Cooking Operations for detailed installation instructions,
materials, duct connections and clearances.
8
Utility and Centrifugal Fans
USF 300 and 400 models are listed
for grease removal (UL/cUL 762)
File no. MH11745
3 Wheel
Diameters
18 in.*
(457 mm)
Duct
from
*Per NFPA 96 the duct
kitchen
must be of all-welded
hood
construction to a
minimum distance of
18 inches (457 mm)
above the roof surface.
V-Belt Drives
V-Belt Drive Installation
1. Remove the protective coating from the end of the
fan shaft using mineral spirits or another similar
solvent. Check to ensure that the shaft is free of
nicks and burrs.
2. Slide sheaves on shafts. Do not drive
sheaves on as this may result in
bearing damage.
3. Align fan and motor sheaves
with a straight edge or
string and tighten.
4. Place belts over sheaves.
Do not pry or force belts,
as this could result in
damage to the cords in
the belts.
5. Adjust the tension until the belts appear snug. Run
the unit for a few minutes and allow the belts to
"Set" properly.
6. With the fan off and disconnect locked out, adjust
the belt tension by moving the motor pivot plate.
When in operation, the tight side of the belts
should be in a straight line from sheave to sheave
with a slight bow on the slack side.
Alignment of Pulleys and Belts
Check pulleys and belts for proper alignment to avoid
unnecessary belt wear, noise, vibration and power
loss. Motor and drive shafts must be parallel and
pulleys in line as shown in Figure 1.
CORRECT
WRONG
Figure 1
The adjustable motor pulley is set at the factory for
the fan RPM specified by the customer. Fan RPM can
be increased by closing or decreased by opening the
adjustable motor pulley. Multi groove variable pitch
pulleys must be adjusted an equal number of turns
open or closed. Any increase in fan speed represents
a substantial increase in load on the motor.
To avoid motor overheating and possible burnout,
motor load amperes should always be checked and
compared to nameplate rating when fan speed is
increased.
Aligning Sheaves with
a Straight Edge
WRONG
WRONG
®
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