Loren Cook LXUL, LTU, LEU, LXULMO, LTUMO Installation, Operation And Maintenance Manual
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®
PROPELLER UPBLAST
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance instructions for standard units of the Upblast:
Upblast Propeller Roof Fans.
• LXUL & LXUM
• LTU
• LEU
• LXULMO &
LXUMMO
• LTU M O
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook catalogs, Propeller Upblast and Propeller Roof,
provide additional information describing the equipment, fan
performance, available accessories and specication data.
For additional safety information, refer to AMCA Publication
410 -9 6 , Safety Practices for Users and Installers of Industrial
and Commercial Fans.
All of the publications listed above can be obtained from:
• lorencook.com
• info@lorencook.com
• 417-869-6474 ext. 166
For information and instructions on special equipment, con-
tact Loren Cook Company at 417-869-6474.
• LEUMO
• TUB
• EUB
• AUB
• TUD
• EUD
• AUD
• SUB
• SUBH
• AI Upblast
Upblast Propeller Roof Fans
Rotating Parts & Electrical Shock Hazard:
Fans should be installed and serviced by qualied personnel
only.
Disconnect electric power before working on unit (prior to removal of guards or entry into access doors).
Follow proper lockout/tagout procedures to ensure the unit
cannot be energized while being installed or serviced.
A disconnect switch should be placed near the fan in order that
the power can be swiftly cut o, in case of an emergency and
in order that maintenance personnel are provided complete
control of the power source.
Grounding is required. All eld-installed wiring must be completed by qualied personnel. All eld installed wiring must
comply with National Electric Code (NFPA 70) and all applicable local codes.
Fans and blowers create pressure at the discharge and vacuum at the inlet. This may cause objects to get pulled into the
unit and objects to be propelled rapidly from the discharge.
The discharge should always be directed in a safe direction
and inlets should not be left unguarded. Any object pulled into
the inlet will become a projectile capable of causing serious injury or death.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage
and shortage immediately upon receipt of the fan.
• Turn the propeller by hand to ensure it turns freely and does
not bind
• Check dampers (if included) for free operation of all moving
parts
• Record on the Delivery Receipt any visible sign of damage
TUB
When air is allowed to move through a non-powered fan,
the impeller can rotate, which is referred to as windmilling.
Windmilling will cause hazardous conditions due to unexpected rotation of components. Impellers should be blocked in position or air passages blocked to prevent draft when working
on fans.
Friction and power loss inside rotating components will cause
them to be a potential burn hazard. All components should be
approached with caution and/or allowed to cool before contacting them for maintenance.
Under certain lighting conditions, rotating components may
appear stationary. Components should be veried to be stationary in a safe manner, before they come into contact with
personnel, tools or clothing.
Failure to follow these instructions could result in death or serious injury.
The attachment of roof mounted fans to the roof curb as well
as the attachment of roof curbs to the building structure must
exceed the structural requirements based on the environmental loading derived from the applicable building code for the
site. The local code ocial may require variations from the recognized code based on local data. The licensed engineer of
record will be responsible for prescribing the correct attach-
ment based on construction materials, code requirements and
environmental eects specic to the installation.
1PROPELLER UPBLAST IO&M B51071-005
Handling
OFFSET ANGULAR OFFSET/ANGULAR
W
GAP
GAP
Lifting Lugs
Lift propeller roof ventila-
tors by lifting lugs located inside the wind band. Never lift
by the shaft, motor, propeller,
or coupling. If your fan has a
special protective nish, handle with extreme care. Even
a small chip will break the
coating’s continuity and destroy its ability to protect the
metal. Propellers are carefully
balanced to give smooth, vibration
free operation. If the propeller is dam-
aged during handling, it will require re-balancing.
Storage
If the fan is stored for any length of time prior to installation,
store it in its original shipping crate and protect it from dust,
debris and the weather.
Outdoor Storage
To maintain good working condition of the fan when it is
stored outdoors or at a construction site, follow the additional
instructions below.
• Coat the shaft and bearings with grease or rust preventative
compound to help seal out moisture
• Periodically rotate the propeller and operate the dampers (if
supplied) to keep a coating of grease on all internal bearing
parts
• Periodically inspect the fan to prevent damaging conditions
• Block propeller to prevent natural rotation
• Cover the unit with some type of weather cover to prevent
moisture, corrosion, dirt or dust accumulation
Installation
Damper Installation
1. Place the damper inside the curb. Ensure the damper will
open freely for the correct direction of the airow.
2. Secure to curb at the damper shelf by installing at least
two sheet metal screws (#10 x 1/2”) on each side of the
damper, through the tray, with the screw head catching
the ange on the damper. This will prevent the dampers
from lifting.
3. Drill a hole in the curb shelf for conduit needed for motor
wiring.
4. Operate the dampers manually to ensure the blades move
freely. Dampers should be released from full open position to check for proper closing.
An inlet guard is recommended. An inlet guard prevents
any large debris from being pulled into the fan and damaging the propeller. The inlet guard is installed on top of the
curb prior to the installation of the fan.
PROPELLER UPBLAST IO&M B51071-0052
Safety Recommendation
Motor Installation
To prevent damage to the fan during shipping, motors 5HP
and larger and extremely heavy motors (cast iron or severe
duty) are shipped loose and must be eld mounted.
The motor should be mounted so that the motor plate is
between the fan shaft and motor shaft.
• Remove the motor plate mounting bolts and the motor plate
• Remove the motor mounting bolts from the motor plate
• Mount the motor to the motor plate aligning to the appropriate holes
• Place the motor plate on the power assembly and rein-stall
the mounting bolts
1
/4
in
c
h
t
o
fo
1
Figure 1
Belt and Pulley Installation
If your fan is a direct drive (models AI, AUD, EUD and TUD),
proceed to Wiring Installation.
Belt tension is determined by the sound of the belts when
the fan is rst started. The belts will produce a loud squeal,
which dissipates after the fan is operating at full capacity. If
belt tension is too tight or too loose, lost eciency and damage can occur.
Do not change the pulley pitch diameter to change tension.
The change will result in a dierent fan speed.
• Loosen the motor plate adjustment nuts on motor base and
move motor plate in order that the belts can easily slip into
the grooves on the pulleys. Never pry, roll or force the belts
over the rim of the pulley
• Adjust the motor plate until proper tension is reached. For
proper tension, a deection of approximately 1/4” per foot of
center distance should be obtained by rmly pressing the
belt. Refer to Figure 1
• Lock the motor plate adjustment nuts in place
• Ensure pulleys are properly aligned. Refer to Figure 2
Tolerance
Center
Distance
Up through 12” 1/16”
12” through 48 1/8”
Over 48 1/4”
Max.
Gap
A
X
Y
CENTER
DISTANCE
(CD)
Figure 2
Z
B
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley set-
screw and by moving the motor pulley on the motor shaft.
Figure 2 indicates where to measure the allowable gap for
the drive alignment tolerance. All contact points (indicated by
WXYZ) are to have a gap less than the tolerance shown in the
table. When the pulleys are not the same
T-
T-
Ground B
Line
Ground A
Ground B
T-
Line
Ground B
J-10
Ground A
Ground A
Line
Ground B
4
5
6
1
728
3
9
L
1
L2L
3
456
789
12
3
L
1
L2L
3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
208/230 V
oltage
1
3
2
3 Phase, 9 Lead Motor
Delta-Connection
High Speed
3
Low Speed
Line
L
1
T
1
T
2
T
3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
Motor
T
13
T
12
T
11
L
2
Line
L
3
Motor
Tr
*
width, the allowable gap must be adjusted
by half of the dierence in width. Figure
3 illustrates using a carpenter’s square to
adjust the position of the motor pulley until
the belt is parallel to the longer leg of the
square.
Wiring Installation
All wiring should be in accordance with
local ordinances and the National Elec-
trical Code, NFPA 70. Ensure the power supply (voltage,
frequency, and current carrying capacity of wires) is in ac-
cordance with the motor nameplate. Refer to the Wiring Diagrams, on page 3.
Lock o all power sources before unit is wired to power
source.
Leave enough slack in the wiring to allow for motor movement when adjusting belt tension. Some fractional motors
have to be removed in order to make the connection with the
terminal box at the end of the motor.
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
3-Phase, 9 Lead Motor
Low Voltage
7
6
1
L
1
To reverse, interchange any two line leads.
olts
9
8
5
4
3
2
L
L
3
2
High V
460 Volts
789
456
12
L
L
3
L
2 Speed, 1 Winding, 3-Phase Motor
L
1
L
2
L
3
Open
Motor
1
Together
2
3
L
4
5
6
1
L
2
Line
L
Motor
1
2
3
4
5
6
To reverse, interchange any two line leads. Motors require magnetic
control.
2 Speed, 2 Winding, 3-Phase
L
1
1
4
L
2
When ground is required, attach to ground A or B with No. 6 thread
forming screw. To reverse, interchange T-1 and T-4.
2 Speed, 2 Winding, Single Phase Motor
High Speed
T-1
4
L
1
L
2
Low Speed
When ground is required, attach to ground A or B with No. 6 thread
forming screw. To reverse, interchange T-1 and T-4 leads.
Single Speed, Single Phase, Dual Voltage
L
1
T-5
When ground is required, attach to ground A or B with No. 6 thread
forming screw. To reverse, interchange T-5 and J-10 leads.
Link A
Link B
Low Voltage
L
2
Line
T-5
J-10
L
1
Link A
and B
L
2
To reverse, High Speed: interchange leads T11 and T12; Low
Speed: interchange leads T1 and T2; Both Speeds: interchange any
two line leads.
Typical Damper Motor Schematic
Fan
Motor
ansformer**
Damper
Motor*
Second
Damper
Transformer*
For 3-Phase, damper motor voltage should be the same between L1
and L2. For single phase application, disregard L3.
*Damper motors may be available in 115, 230 and 460 volt models. The damper motor nameplate voltage should be veried prior to
connection.
**A transformer may be provided in some installations to correct the
damper motor voltage to the specied voltage.
L3
L2
L1
Follow the wiring diagram in the disconnect switch and
the wiring diagram provided with the motor. Correctly la-
bel the circuit on the main power box and always identify a
closed switch to promote safety (i.e., red tape over a closed
switch).
3PROPELLER UPBLAST IO&M B51071-005
Fan Installation
Figure 4 - Safety Bolt Removal
The fan support (roof curb) should provide a level surface
for installation. If the roof is pitched more than 1/2:12, a sloped
curb must be used to correct for the incline. If the unit is in-
stalled on a non-level surface, the damper door pivot should
be positioned perpendicular to the peak of the roof. Consult
factory for additional details.
• Place fan over roof opening
• Secure the fan with lag screws, anchor bolts, or other suit-
able fasteners
Final Installation Steps
1. Inspect fasteners and setscrews, particularly fan mount-
ing and bearing fasteners, and tighten according to the
recommended torque shown in the table, Recommended
Torque for Setscrews/Bolts.
2. Inspect for correct voltage with voltmeter.
3. Ensure all accessories are installed.
4. Test the fan to be sure the rotation is the same as indicat-
ed by the arrow marked Rotation.
Do not allow the fan to run in the wrong direction. This
will overheat the motor and cause serious damage.
For 3-phase motors, if the fan is running in the wrong
direction, check the control switch. It is possible to
interchange two leads at this location so that the fan is
operating in the correct direction.
Smoke Control Units Additional Installation Steps
The damper actuator arms are safety bolted at the factory
to prevent damage or personnel injury during handling and installation. The bolt must be removed for the damper actuator
to operate correctly. Refer to Figure 4.
• Remove Bolt “A” from each of the damper arms
• Be sure that linkage hook “B” is in contact with bolt “C” to
prevent excessive load on the fusible link
The damper arms will not operate unless this bolt is removed. This bolt should be replaced before any maintenance
or repair work is started.
Bolt C
Linkage
Hook B
Bolt A
3. Inspect motor wiring.
4. Ensure the belt touches only the pulleys.
5. Rotate the propeller to ensure it does not rub against the
base.
6. Ensure fan and ductwork are clean and free of debris.
7. Test the fan to ensure the rotation of the propeller is the
same as indicated by the rotation label.
8. Close and secure all access doors.
9. Restore power to unit.
Recommended Torque for Setscrews/Bolts (IN-LB)
Setscrews Hold Down Bolts
Key Hex
Size
Across
Flats
#8 5/64” 15 21 3/8”-16 324
#10 3/32” 27 33 1/2”-13 780
1/4 1/8” 70 80 5/8”-11 1440
5/16 5/32” 140 160 3/4”-10 2400
3/8 3/16” 250 290 7/8”-9 1920
7/16 7/32” 355 405 1”-8 2700
1/2 1/4” 560 640 1-1/8”-7 4200
5/8 5/16” 1120 1280 1-1/4”-7 6000
3/4 3/8” 1680 1920 - 7/8 1/2” 4200 4800 - -
1 9/16” 5600 6400 - -
Recommended
Tor q u e
Min. Max.
Size
Recommended
Tor q u e
Start Up
Turn the fan on. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation
• Excessive vibration
• Unusual noise
• Bearing noise
• Improper belt alignment or tension (listen for a continuous
squealing noise)
• Improper motor amperage or voltage
If a problem is discovered, immediately shut o the
fan. Lock out all electrical power and check for the
cause of the trouble. Refer to Troubleshooting.
Inspection
Inspection of the fan should be conducted at the rst
30-minute, 8-hour and 24-hour intervals of satisfactory op-
eration. During the inspections, stop the fan and inspect as
per the information below.
30-Minute Interval:
Inspect bolts, setscrews, and motor mounting bolts. Adjust
and tighten as necessary.
8-Hour Interval
Inspect belt alignment and tension. Adjust and tighten as
necessary.
24-Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
Inspect fasteners and setscrews, particularly those used
for mounting the unit, and tighten if necessary.
2. Inspect belt tension and pulley alignment. (Remember, if belt
tension is correct, a loud squeal occurs as the fan increases
to full power.)
PROPELLER UPBLAST IO&M B51071-0054
Maintenance
Establish a schedule for inspecting all parts of the fan. The
frequency of inspection depends on the operating conditions
and location of the fan.
Inspect fans exhausting corrosive or contaminated air within
the rst month of operation. Fans exhausting contaminated air
(airborne abrasives) should be inspected every three months.
Clean the propeller and air inlets if material build-up is excessive. Excessive build-up can cause imbalance and failure of
the propeller.
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