COOK LC User Manual
LC
Low Profile Roof Exhausters
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance procedures for standard units of the “LC”
(HLC-D, HLC-B, TLC-D & TLC-B) Low Profile Roof
Exhausters.
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook catalog LC provides additional information
describing the equipment, fan performance, available
accessories and specification data.
For additional safety information, refer to AMCA
publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans.
All of the publications listed above can be obtained from
Loren Cook Company by phoning (417)869-6474, extension 166; by FAX at (417)832-9431; or by e-mail at
info@lorencook.com.
For information and instructions on special equipment,
contact Loren Cook Company at (417)869-6474.
Rotating Parts & Electrical Shock Hazard:
Disconnect electric power before working on unit.
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 off, in case of
an emergency and in order that maintenance
personnel are provided complete control of the power
source.
Grounding is required. All field-installed wiring must
be completed by qualified personnel. All fieldinstalled wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.
Failure to follow these instructions could result in
death or serious injury.
Receiving and Inspection
Carefully inspect the fan and accessories for any
damage and shortage immediately upon receipt of the fan.
• Turn the wheel 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.
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.
Installation
To prevent damage to the fan during shipping, motors 5
HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be field mounted
by bolting the motor on the motor mounting plate in the
existing mounting slots.
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
official may require variations from the recognized
code based on local data. The licensed engineer of
record will be responsible for prescribing the correct
attachment based on construction materials, code
requirements and environmental effects specific to
the installation.
Failure to follow these instructions could result in
death or serious injury.
Dampers
If your fan is supplied with dampers, follow the directions
below. If your fan does not include dampers, proceed to
Belt and Pulley Installation.
a. Place the damper inside the curb. Ensure the damper
will open freely for the correct direction of the airflow.
b. Secure to curb at the damper shelf.
c. Drill a hole in the curb shelf for conduit needed for
motor wiring.
d. Operate the dampers manually to ensure the blades
move freely. Dampers should be released from full
open position to check for proper closing.
e. Install fan over curb with the conduit location in line
with the conduit hole in the curb.
Handling
Lift the fan by the base or by the shipping carton.
NOTICE! Never lift by the shaft, motor or housing.
HLC
Belt and Pulley Installation
1 foot
1/4 inch
Belt tension is determined by the sound of the belts when
the fan is first 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 efficiency and
damage can occur.
Do not change the pulley pitch diameter to change
tension. The change will result in a different fan speed.
Belt and Pulley
a. Loosen the motor plate adjustment bolts 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.
b. Adjust the motor plate until proper tension is reached.
For proper tension, a deflection of approximately 1/4”
per foot of center distance should be obtained by firmly
pressing the belt. Refer to Figure 1.
Figure 1
c. Lock the motor plate adjustment bolts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.
Pulley Alignment
Pulley alignment is adjusted by
loosening the motor pulley setscrew
and by moving the motor pulley on
the motor shaft.
OFFSET ANGULAR OFFSET/ANGULAR
A
W
B
CENTER
DISTANCE
(CD)
GAP
X
Y
Z
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 width, the allowable
gap must be adjusted by half of the
difference 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.
Tolerance
Center Distance Maximum Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Figure 2
GAP
Figure 3
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the
power supply (voltage, frequency, and current carrying
capacity of wires) is in accordance with the motor
nameplate.
Refer to the Wiring Diagrams, next page.
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.
Follow the wiring diagram in the disconnect
switch and the wiring diagram provided with the
motor. Correctly label the circuit on the main
power box and always identify a closed switch
to promote safety (i.e., red tape over a closed
switch).
Fan Installation
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. Place
fan over roof opening. Secure the fan with lag screws,
anchor bolts, or other suitable fasteners.
For easier installation larger size fans may be
disassembled on the ground and transported to the roof in
sections. However, if the sections are not assembled
properly the wheel may rub against the fan inlet causing
noise.
This can be prevented by:
• Ensuring the wheel is tightly fastened on the shaft.
• Ensuring the wheel is not dropped on the shaft before
the setscrews are tightened.
Should interference occur, disconnect the power source.
Refer to Bearing Replacement on page 5.
Final Installation Steps
a. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten according
to the recommended torque shown in the table on
page 4, Recommended Torque for Setscrews/Bolts.
b. Inspect for correct amperage and voltage with an
ammeter and voltmeter.
c. Ensure all accessories are installed.
d. Inspect wheel-to-inlet clearance on power roof fans.
e. Test the fan to be sure the rotation is the same as
indicated by the arrow marked Rotation.
NOTICE! 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. If is possible to interchange two leads at this
location so that the fan is operating in the correct
direction.
2
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
L
T-1
T-4
Ground B
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
1
Line
L
2
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
1
To reverse, interchange any 2 line leads.
3
High Voltage
460 Volts
456
789
3
12
L2L
L
3
1
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
L
L
1
2
2 Speed, 2 Winding, Single Phase Motor 2 Speed, 1 Winding, 3 Phase Motor
Ground A
High Speed
T-1
T-4
L
1
Line
L
2
Low Speed
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
High Speed
1
Together
2
3
L
4
1
L
5
6
L
Motor
2
Line
3
Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase
Ground A
L
Line
L
1
T-5
J-10
2
Ground B
J-10
T-5
Link A
Link B
Low Voltage
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Ground A
Link A & B
L
Line
L
1
2
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.
Typical Damper Motor Schematic
9
5
3
L
3
Low Speed
1
2
3
4
5
6
High Voltage
460 Volts
789
456
3
12
L1L
L
3
2
L
1
L
2
Line
L
3
Open
Fan
Motor
Transformer**
Damper
Motor*
Second
Damper
Motor
L3
L2
L1
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 verified prior to connection. **A transformer may be
provided in some installations to correct the damper motor voltage to the
specified voltage.
3
Loading...