COOK Propeller Upblast User Manual

Propeller Upblast

Upblast Propeller Roof Fans

INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

This publication contains the installation, operation

and maintenance procedures for standard units of the

Upblast - Upblast Propeller Roof Fans.

• EUD

• AUD • SUB

• EUB • SUBH

• AUB • TUD

• LXU • TUBSC

Carefully read this publication prior to any installa-

tion or maintenance procedure.

Loren Cook catalogs, Propeller Upblast and Propeller

Roof, provide additional information describing the equip-

ment, 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 [phone], exten­sion 166; by FAX at [phone]; or by e-mail at
[e-mail].

For information and instructions on special equipment,
contact Loren Cook Company at [phone].

• LEU

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.

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 damaged during han­dling, it will require rebalancing.

Personal Safety

Disconnect switches are recommended. Place
the disconnect switch 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.

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.

WARNING

This unit has rotating parts. Safety precautions
should be exercised at all times during installation,
operation, and maintenance.
ALWAYS disconnect power prior to working on fan.

Lifting Lugs

Handling

Lift propeller roof ventilators
by lifting lugs located inside the
windband. Never lift by the
shaft, motor, propeller, or cou­pling.

If your fan has a special pro­tective finish, handle with

TUB

Installation

1 foot

1/4 inch

Damper 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 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 flange on the damper. This will prevent the dampers
from lifting.

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.

Note

An inlet basket guard is recommended. A basket
guard prevents any large debris from being pulled
into the fan and damaging the propeller. The Loren
Cook basket guard is installed on top of the curb
before the fan is installed.

Motor 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.

The motor should be mounted so that the motor plate is
between the fan shaft and motor shaft.

a. Remove the motor plate mounting bolts and the motor

plate.
b. Remove the motor mounting bolts from the motor plate.
c. Mount the motor to the motor plate aligning to the

appropriate holes.
d. Place the motor plate on the power assembly and rein-

stall the mounting bolts.

Figure 1

Belt and Pulley Installation

If your fan is a direct drive (model AUD), proceed to Wir-

ing Installation.

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.

a. 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.

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.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.

Tolerance

Center Distance

Up thru 12” 1/16”
12” up through 48 1/8”

Over 48” 1/4”

Figure 2

Maximum

Gap

OFFSET ANGULAR OFFSET/ANGULAR

A

W

B

CENTER

DISTANCE

(CD)

GAP

X

Y

Z

GAP

Pulley Alignment

Pulley alignment is adjusted by loosening
the motor pulley setscrew 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 width, the allowable

Figure 3

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.

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, on page 3.

Lock off 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.

Personal Safety

Disconnect switches are recommended. Place the
disconnect switch 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.

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

Line

L

1

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

3

High Voltage

460 Volts

456

789

3

12

L2L

L

1

To reverse, interchange any 2 line leads.

3 Phase, 9 Lead Motor
Delta-Connection

Low Voltage

208/230 Volts

7
6

1

L

3

1

8
4
2

L

2

screw. To reverse, interchange T-1 and T-4.

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.

High Speed

1

Together

2

Motor

3

L

4

1

L

5

2

6

Line

L

3

To reverse, interchange any 2 line leads. Motors require magnetic control.

Low Speed

Motor

High Voltage

1
2
3

460 Volts

789

456

12

L1L

L

2

L

1

L

2

Line

L

3

3

3

9
5
3

L

3

4

Open

5
6

Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase

Ground A

L

T-5

J-10

Link A

Link B

Low Voltage

Ground B

Line

L

1

T-5

J-10

2

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

Fan

Motor

Transformer**

Damper

Motor*

Transformer**

Second
Damper

Motor

L3
L2
L1

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.

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. If the
unit is installed on a non-level surface, the damper door
pivot should be positioned perpendicular to the peak of the
roof. Consult factory for additional details.

a. Place fan over roof opening.
b. Secure the fan with lag scews, anchor bolts, or other

suitable fasteners.

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 voltage with voltmeter.
c. Ensure all accessories are installed.

d. Test the fan to be sure the rotation is the same as indi-

cated 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.

3