Loren Cook QMXD-HP, QMXS, QMX, QMXS-HP, QMXE-HP Installation, Operation And Maintenance Manual
...
OPERATION & MAINTENACE
MANUAL
FANS
Job Name: MICKEY LELAND CPAYM
Location: HOUSTON, TEXAS
Architect: HARRISON KORNBERG
Engineer: SHAH SMITH & ASSOCIATES
Contractor: ENVIROTECH MECHANICAL
Date: APRIL 20, 2016
Submitted By: RUSTY REED
A Certified Minority Owned Small Business Enterprise
P. O. Box 630409, Houston, TX 77263-0409
Phone: (713) 266-1761 Fax: (713) 781-6532
www.distribaire.com
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
Typical Wiring Path for Roof Mounted Units
For sizes 135-600, route conduit under motor cover
between the motor support rails and out to enclosure as
shown in Figure 1 below.
Figure 1
ble to interchange two leads at this location so that the
fan is operating in the correct direction.
QMX
QMX-HP
Size 135-600, Run
Liquidtite Between
Weather Cover and Unit
Liquidtite
For sizes 90-120, route conduit through holes in the
sides of the motor support saddle as shown in Figure 2
below.
Figure 2
90-120, Run
Liquidtite Through
Holes in Saddle
Enclosure May Be Located
in Either Corner
(Liquidtite Not Shown)
Wheel Rotation
Test the fan to ensure the rotation of the wheel is the
same as indicated by the arrow marked Rotation.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory. Changing the rotation of this type of motor should only be
attempted by a qualified electrician.
208, 230, and 460, 3 Phase Motors
These motors are electrically reversible by switching
two of the supply leads. For this reason, the rotation of the
fan cannot be restricted to one direction at the factory. See
Wiring Diagrams for specific information on reversing
wheel direction.
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 possi-
Weather Cover
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
Recommended Torque for Setscrews/Bolts.
b. Inspect for correct voltage with voltmeter.
c. Ensure all accessories are installed.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power
sources.
b. Ensure fasteners and setscrews, particularly those
used for mounting the fan, are tightened.
c. Inspect belt tension and pulley alignment.
d. Inspect motor wiring.
e. Ensure belt touches only the pulley.
f. Ensure fan and ductwork are clean and free of debris.
g. Inspect wheel-to-inlet clearance. The correct wheel-
to-inlet clearance is critical to proper fan performance.
h. Close and secure all access doors.
g. Restore power to the fan.
Start Up
Turn the fan on. In variable speed units, set the fan to its
lowest speed and inspect for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for squealing).
• Improper motor amperage or voltage.
If a problem is discovered, immediately shut the fan
off. Lock out all electrical power and check for the
cause of the trouble. See Troubleshooting.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as per
the Conditions Chart.
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.
5
Recommended Torque for Setscrews/Bolts
Setscrews
Size
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 29 348 7/8”-9 2400
1/2” 1/4” 42 504 1” -8 3000
5/8” 5/16” 92 1104
3/4” 3/8” 120 1440
Key Hex
Across
Flats
Recommended
Torque
Min. Max. Size
(IN/LB)
Hold Down Bolts
Wrench
Torque
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 first month of operation. Fans exhausting contaminated air (airborne abrasives) should be inspected
every three months.
Regular inspections are recommended for fans exhausting non-contaminated air.
It is recommended the following inspection be conducted
twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer
to Belt and Pulley Installation, page 3.
• Bearings should be inspected as recommended in the
Conditions Chart.
• Inspect variable inlet vanes (if supplied) for freedom of
operation and excessive wear. The vane position
should agree with the position of the control arm. As
the variable inlet vanes close, the entering air should
spin in the same direction as the wheel.
• Inspect springs and rubber isolators for deterioration
and replace as needed.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevents imbalance and damage.
Lubrication - Fan Bearings
QMX bearings are lubricated through a grease fitting on
the outer housing and should be lubricated by the schedule, Conditions Chart.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can burst
seals thus reducing bearing life.
Lubrication Conditions Chart
Fan Class Fan Status Shaft Size
Normal Conditions
(Clean, Dry & Smooth)
QMX
QMX-HP
Extreme Conditions
(Dirty/Wet/Rough)
Normal Conditions
(Clean, Dry & Smooth)
Extreme Conditions
(Dirty/Wet/Rough)
> 1-1/2” 7,500
< 1-1/2” 2,000
> 1-1/2” 1,500
< 1-1/2” 400
> 2” 5,000
< 2” 1,000
> 2” 1,000
< 2” 200
Maximum Interval (opera-
tional hrs)
In the event the bearing cannot be seen, use no more than
three injections with a hand-operated grease gun.
Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be performed
prior to each break in operation.
• Higher Temperature: it is recommended to halve the
intervals for every 30F increase in operating temperature
above 120F not to exceed 230F for standard bearings;
High Temperature bearings (optional) can operate up to
400F.
• Vertical Shaft: it is recommended that the intervals
should be halved.
Loren Cook Company uses petroleum lubricant in a lithium base. Other types of grease should not be used unless
the bearings and lines have been flushed clean. If another
type of grease is used, it should be a lithium-based grease
conforming to NLGI grade 2 consistency.
A NLGI grade 2 grease is a light viscosity, low-torque,
rust-inhibiting lubricant that is water resistant. Its temperature range is from -30F to +200F and capable of intermittent highs of +250F.
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Motor bearings without provisions for relubrication will
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures or
excessive contaminates, it is advisable to have the maintenance department disassemble and lubricate the bearings
after 3 years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow intervals of the table below.
Relubrication Intervals
NEMA Frame Size
Service
Conditions
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
Up to and
including 184T
1800 RPM
and less
Over 1800
RPM
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatible grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service representative.
6
Changing Shaft Speed
All belt driven fans with motors up to and including 5 HP
are equipped with variable pitch pulleys. To change the fan
speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
If the pulley has multiple grooves, all must be adjusted
to the same width.
c. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides deeper in
the groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that the belt rides higher in
the groove (larger pitch diameter). Ensure that the
speed limits of the fan and the horsepower limits of the
motor are maintained.
Max Catalog RPM
Pulley and Belt
Replacement
a. Loosen and remove belts
by adjusting motor
mounting plate.
b. Remove pulleys from
their respective shafts.
c. Clean the motor and fan
shafts.
d. Clean bores of pulleys
and coat the bores with
heavy oil.
e. Remove grease, rust, or
burrs from the pulleys
and shafts.
Fan
Size
120 3707 4490
135 3295 3991
150 2907 3510
165 2633 3191
180 2423 2925
202 2152 2600
225 1937 2340
245 1780 2149
270 1623 1866
300 1465 1679
330 1332 1527
365 1207 1381
402 1081 1252
445 988 1132
490 897 1028
540 813 933
600 732 -
QMX QMX-HP
90 4943 5987
f. Remove burrs from shaft by sanding.
g. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when excessive force is used in placing the pulleys on their
respective shafts.
h. Tighten in place.
i. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The fan bearings are pillow block ball bearings.
a. Loosen and remove belts by adjusting motor mounting
plate
b. Remove the bearing cover by removing the bolts
around the perimeter of the bearing cover. Do not
remove fan sheave yet.
c. Remove inlet cone by removing attaching bolts/nuts
around perimeter of the inlet plate.
d. Remove wheel by loosening setscrews and sliding off
shaft.
e. Record the location of the fan sheave from end of
shaft, and remove the sheave.
f. Record the distance from the bearing to the end of the
shaft.
g. Loosen setscrews on bearings and remove shaft.
j. Remove bearings from bearing base and replace with
new ones, noting the exact location of each; do not
fully tighten base bolts.
k. Slide shaft through bearings until shaft protrudes the
same amount as measured above. Tapping the inner
race of each bearing with a soft driver may be
required. Do not hammer the end of the shaft or the
bearing housing.
l. Return setscrews to same location as marked above
and tighten one setscrew on each bearing to half its
specified torque.
m. Rotate the shaft to allow the bearings to align them
selves.
n. Replace wheel but do not tighten yet.
o. Replace inlet cone. Wheel may need to be moved to
allow proper alignment. Care should be taken to
insure that inlet cone is centered inside wheel before
and after tightening attaching bolts.
p. Slide wheel on shaft to achieve proper wheel/inlet
overlap and tighten wheel set screws. Refer to
Wheel-to-Inlet Clearance on page 3.
q. Tighten hold-down bolts to proper torque.
r. Turn the shaft by hand. resistance should be the
same as it was before hold-down bolts were fully tight-
ened.
s. Tighten all bearing setscrews to full specified torque.
t. Replace the sheave, align with motor sheave, and
adjust the belt tension.
u. Test run fan and retighten all setscrews and bolts, and
trim balance as necessary (.0785 in/sec max).
v. Replace discharge cover.
Wheel Replacement
The wheel has a pre-machined shoulder in the hub for
the use of most 2 and 3 jaw mechanical puller.
a. Align center of the puller with the center of the shaft.
b. Ensure all setscrews in the hub, normally two, are
fully removed.
c. Slowly remove wheel from the shaft.
SEE DETAIL A
PRE-MACHINED SHOULDER
DETAIL A
7
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Poor fan inlet or outlet conditions. There should be a straight clear duct at the inlet or outlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged wheel.
•Belts misaligned.
•Belts too loose; worn or oily belts.
•Loose fasteners.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Bearing set screws loose.
•Bearings need lubrication or replacement.
•Debris in impeller.
•Fan surge.
•See page 4 for issues regarding use of VFD.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan speed.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
8
QMX/QMXD-HP/QMX-HP Parts List
8
7
6
5
4
3
2
1
Horizontal Mount
12
14
9
10
21
20
19
13
12
11
15
1
16
14
17
30
24
18
23
10
22
25
29
4
Direct Drive
ITEM
NUMBER
1 Companion Flange (Optional) 16 Bearing Cover
2 External Inlet Vane Damper (Optional) 17 Bearings (Two Required)
3 Inlet Spiral Guard or Safety Screen (Optional) 18 Isolator (Four Required Optional)
4 Inlet Cone 19 Isolation Rails - Horizontal Mount (Optional)
5 Mix-Flow Wheel 20 Base - Horizontal Mount (QMX)
6 Shaft 21 Thrust Restraint - Horizontal Mount (Optional)
7 Access Door (Optional) 22 Isolation Structure - Vertical Mount (Optional)
8 Motor Cover (Optional) 23 Housing - Vertical Mount (QMX)
9 Housing-Horizontal Mount (QMX) 24 Shaft Locking Collar - Vertical Mount
10 Motor 25 Housing - Direct Drive
11 Motor Plate (QMX) 26 Base - Direct Drive
12 Belt Guard 27 Motor Plate - Direct Drive
13 Belt Set 28 Motor Cover - Direct Drive
14 Drive Pulley 29 Mix-Flow Wheel - Direct Drive
15 Discharge Safety Screen (Optional) 30 Horizontal Split Housing (Optional)
26
DESCRIPTION
ITEM
ITEM
NUMBER
27
28
ITEM
DESCRIPTION
Vertical Mount
9
QMXE/QMXE-HP Parts List
3
2
5
QMXS/QMXS-HP Parts List
5
9
6
4
ITEM
NUMBER
1 QMX Curb Cap
2 QMXE Birdscreen
3 QMXE Top Cap Post
4 QMXE Baffle Brace
5 QMXE Top Cap Extension (for Size 90 only)
6 QMXE Top Cap
See common parts (not shown) listed on page 9.
ITEM
DESCRIPTION
1
ITEM
NUMBER
6
7
8
4
3
2
1 QMX Curb Cap
2 QMXS Top Cap-Open
3 QMXS Upper Baffle Brace
4 QMXS Top Cap Post
5 QMXS Birdscreen
6 QMXS Top Cap
7 QMXS Lower Top Cap Post
8 QMXS Lower Baffle Brace
9 QMXS Adapter Plate
See common parts (not shown) listed on page 9.
ITEM
DESCRIPTION
1
10
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