COOK QMX User Manual
QMX
®
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation
and maintenance instructions for standard units of the
QMX-Mixed Flow Inline.
• QMX • QMXD-HP • QMX-HP • QMXE
• QMXS • QMXE-HP • QMXS-HP • QMXU
• QMXU-HP • QMXLE • QMXLE-HP
Carefully read this publication prior to any installation or maintenance procedure.
Loren Cook catalog, QMX, 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 on special equipment, contact Loren
Cook Company Customer Service Department at (417)
869-6474.
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.
• Inspect inlet vane dampers (if supplied) for free operation of all moving parts.
• Record on the Delivery Receipt any visible sign of
damage.
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.
Handling
Lift the fan by lifting lugs. Never lift by the shaft, motor, or
housing.
Mixed Flow Inline
• Periodically inspect the unit to prevent damaging conditions.
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.
Installation
QMX and QMX-HP can be mounted horizontally or vertically to a floor or a ceiling in various motor positions and
discharges. QMXU, QMXU-HP, QMXE, QMXE-HP, QMXS
and QMXS-HP are all designed to be roof mounted on typical roof curbs. The QMXLE or QMXLE-HP units, however,
should not be mounted on sheet metal roof curbs, but supported by integral members of the roof structure, designed
and constructed by others per local requirements and environments.
Most motors are shipped mounted on the fans with belts
and drives installed. However, extremely heavy motors are
shipped separately, and some motors are shipped separately due to height limitations. These motors and drives
will require field installation.
NOTE
Although a certain amount of vibration is inherent
in operating fans, extreme vibration is a serious
problem that may cause structural and mechanical
failure.
Isolation Installation
To help prevent vibration and noise from being transferred
to the building, isolators are recommended.
Floor Mounted Spring Isolators
a. Mount fan on isolation base or rails (if supplied).
b. Elevate fan (or isolation base) to operating height and
insert blocks to hold in position.
c. Position isolators under the fan and vertically align by
inserting leveling bolt through mounting holes in the
fan or the base. The isolator must be installed on a
level surface.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moistureinhibiting oil. Refer to Lubricants on page 6. Also, store the
fan in its original crate and protect it from dust, debris and
the weather.
• Cover the inlet and outlet, and belt tunnel opening to
prevent the accumulation of dirt and moisture in the
housing.
• Periodically rotate the wheel and operate inlet vane
dampers (if supplied) to keep a coating of grease on all
internal bearing parts.
QMX
d. Adjust the isolators by turning the leveling nut counter
clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the isolators and the fan raises uniformly off the blocks. Then
remove the blocks.
e. Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
f. Secure isolators to mounting surface.
Spring Isolator
Figure 1 -Floor Mount Isolators
Rubber-In-Shear Isolator
Floor Mounted Rubber-In-Shear (RIS) Isolators
a. Mount fan on isolation base or rails (if supplied).
b. Elevate fan to provide room to insert isolators
between the fan and foundation and block in position.
c. Position isolators under fan and secure bolts.
d. Remove blocks and allow fan to rest on floor. Isolators
must be installed on a level surface (leveling should
not be required).
e. Secure isolators to mounting surface.
Ceiling Mounted Spring and Rubber-in-Shear (RIS) Isolators
a. Elevate fan to operating height and brace.
b. Attach threaded rod to overhead support structure
directly above each mounting hole. Rod should extend
to within a few feet of fan.
c. Attach isolator to end of threaded rod using a nut on
each side of isolator bracket.
d. Insert another section of threaded rod through the fan
mounting hole and isolator.
e. Attach two nuts to threaded rod in isolator.
f. Place adjusting nut and locking nut on threaded rod
near fan mounting bracket.
g. Alternately rotate adjusting nut at each mounting loca-
tion until the fan weight is uniformly transferred to the
isolators. Remove bracing.
duct diameter of straight duct before placing an elbow or
damper. Clearance is also required on the inlet and outlet
for maintenance such as pulley or bearing replacement.
Non-Ducted Inlet Clearance
If your fan has an open inlet (no duct work), the fan must
be placed 1 effective wheel diameter away from walls and
bulkheads.
MIN
1 DIA
Non-ducted Inlet Clearance
Free Discharge
Avoid a free discharge into the plenum. This will result in
lost efficiency because it doesn’t allow for a static regain.
Correct
Free Discharge
Incorrect
Inlet Duct Turns
For ducted inlets, allow at least 3 effective wheel diameters between duct turns or elbows and the fan inlet.
MIN
Correct
Incorrect
Inlet Duct Turns
3 DIA
Discharge Duct Turns
Where possible, allow 3 duct diameters between duct
turns or elbows and the fan outlet. Refer to the drawing
below.
Ceiling Mounted Spring Isolator
Figure 2 - Ceiling Mount Isolators
Rubber-In-Shear Ceiling Isolators
Duct and Damper Installation
Efficient fan performance relies on the proper installation
of inlet and discharge ducts, as well as dampers. Be sure
your fan conforms to the guidelines below and allows 3
Correct
MIN
3 DIA
Incorrect
Discharge Duct Turns
2
Wheel-to-Inlet Clearance
1 foot
1/4 inch
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet drawing below for correct overlap.
Adjust the overlap by loosening the wheel hub and moving the wheel along the shaft to obtain the
correct value. Trim balance as necessary
following procedure (.0785 in/sec max).
A uniform radial gap (space between the
edge of the cone and the edge of the inlet) is
obtained by loosening the inlet cone bolts
and repositioning the inlet cone.
SEE DETAIL A
OVERLAP
RADIAL GAP
DETAIL A
Wheel/Inlet Overlap
Unit
Overlap
Size
(Inches)
90 0.16
120 0.19
135 0.20
150 0.22
165 0.23
180 0.24
202 0.27
225 0.29
245 0.31
270 0.33
300 0.37
330 0.41
365 0.45
402 0.50
445 0.55
490 0.61
540 0.67
600 0.76
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud squeal
which dissipates after the fan is operating at full capacity. If
the belt tension is too tight or too loose, lost efficiency and
possible damage can occur.
Do not change the pulley pitch diameter to change
tension. This will result in a different fan speed.
a. Loosen motor plate adjustment bolts 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 3.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4.
Tolerance
Center Distance
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Figure 4
Maximum
Gap
OFFSET ANGULAR OFFSET/ANGULAR
A
W
B
CENTER
DISTANCE
(CD)
GAP
X
Y
Z
GAP
Figure 4 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 5 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.
Figure 5
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.
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. To
remove motor, remove bolts securing motor base to power
assembly. Do not remove motor mounting bolts.
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.
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).
Figure 3
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
3
Use of Variable Frequency Drives
Motors -
Motors that are to be operated using a Variable Frequency Drive (VFD) must be VFD compatible. At a minimum, this must be a Premium Efficiency motor with Class F
insulation. Motors that are not supplied by Loren Cook
Company should have the recommendation of the motor
manufacturer for use with a VFD.
Grounding -
The fan frame, motor and VFD must be connected to a
common earth ground to prevent transient voltages from
damaging rotating elements.
Wiring -
Line reactors may be required to reduce over-voltage
spikes in the motors. The motor manufacturer should be
Wiring Diagrams
consulted for recommended line impedance and usage of
line reactors or filters, if the lead length between the VFD
and the motor exceeds 10 feet (3m).
Fan -
It is the responsibility of the installing body to perform
coast-down tests and identify any resonant frequencies
after the equipment is fully installed. These resonant frequencies are to be removed from the operating range of
the fan by using the “skip frequency” function in the VFD
programming. Failure to remove resonant frequencies
from the operating range will decrease the operating life of
the fan and void the warranty.
Single Speed, Single Phase Motor
Ground A
L
1
T-1
T-4
Line
L
2
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.
2 Speed, 2 Winding, Single Phase Motor
Ground A
High Speed
T-1
T-4
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.
Low Speed
L
1
Line
L
2
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
1
728
To reverse, interchange any 2 line leads.
3
9
L2L
L
3
1
High Voltage
460 Volts
456
789
12
L2L
L
1
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
3
L
1
3
L
L
2
High Voltage
9
5
3
3
460 Volts
789
456
12
L
L
1
2
3
L
3
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
Together
2
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
3
L
4
1
L
5
2
6
Line
L
3
Low Speed
Motor
L
1
1
L
2
2
L
3
Open
Line
3
4
5
6
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
T-5
J-10
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.
Link A
Link B
Low Voltage
Ground A
Link A & B
L
1
Line
L
2
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.
4
Loading...