Acme Engineering QBMX Installation Manual

Form 613153
Read and Save These Instructions
INSTALLATION & MAINTENANCE INSTRUCTIONS
QBMX SERIES
The Inline Mixed Flow Fan
INSTALLATION l OPERATION l MAINTENANCE
I. INTRODUCTION
Your Series QBMX Mixed Flow Fan is a carefully engineered and constructed piece of machinery which will give long satisfactory service provided correct installation and proper maintenance practices are observed. These instructions, along with others for motors, parts or accessories which may be furnished as part of your fan, are supplied for your information and guidance. DO NOT DESTROY AFTER INSTALLATION ­RETAIN WITH THE UNIT FOR MAINTENANCE. Preventative maintenance including periodic inspection, testing, cleaning, lubrication and replacement of worn parts will forestall equipment breakdowns and minimize equipment shut-downs.
WARNING! The inner cylinder is not air tight and therefore, the fan should not be used where the escape of contaminated air would cause problems. The user must accept ultimate responsibility for the acceptability of the fan in his system.
II. RECEIVING AND HANDLING
Fans are prepared for shipment according to the Uniform Freight Classification Rules of the carriers. The equipment is carefully inspected before shipment and it is the responsibility of the carrier that it be in perfect condition upon arrival.
When the carrier accepts a shipment and signs our Bill of Lading, the carrier is responsible for any subsequent shortages or damage, evident or concealed, and claim must be against the carrier.
each end of the unit for handling purposes. In addition, rope slings may be used around the casing, or eye bolts can be set in the flange bolt holes. Some vertical units have mounting brackets which can be used. Do not lift by the fan wheel, drive shaft, motor or motor base as this could cause damage or misalignment.
Fan wheels and casings which are furnished with special coverings, such as rubber, phenolic enamels, or other protective coatings, should be handled with extreme care as many of these coatings are easily damaged and even a small chipped spot will break the continuity of the coating and destroy its value as a protective covering for the metal.
Fan wheels are carefully balanced to provide smooth operation. If the fan wheel is damaged during handling, it may result in an out-of-balance condition and require re-balancing. If a shaft is dropped or unduly strained, it may be bent which will also result in out-of-balance operation of the fan.
A fan wheel should never be lifted by or allowed to rest its entire weight on the side plates or blades. The fan wheel and shaft assembly can be lifted by slings around the shaft on each side of the wheel so the wheel is supported by its hub. If a chain is used there must be sufficient padding on the shaft and wheel to prevent the scoring of the shaft or injury to the wheel. The chain or cable should be spread with timbers, or braced by some other method to prevent damage to the wheel side plates. If the fan wheel is received separate from the shaft, a support should be placed through the hub for lifting, making sure not to injure the finished bore of the wheel.
Immediately upon receipt of a shipment, carefully inspect for damage and shortage. If any damage and/or shortage is detected or suspected, the carrier must be asked to conduct an inspection. The consignee’s representative should not accept shipment without a notation on the delivery receipt indicating items not delivered or apparent extent of damage.
When a shipment is opened and damage is found which was not evident externally (concealed damage), it is mandatory that the consignee request an immediate inspection by the carrier. Report damage to the carrier within 15 days. Failure to report damage within the above time limit will cause rejection of a claim.
Promptly file a claim against the final carrier. A claim will not be considered by a transportation company unless presented within nine (9) months from date of receipt of equipment.
WARNING! Fans should never be lifted by the shaft, motor or accessories. These are not designed to support total fan weight and may break causing personal injury or unit damage.
Even though Mixed Flow Fans are rugged in construction, some care must be taken in handling. Lifting lugs are built on to
III. STORING OR LONG TERM SHUTDOWN
Depending upon size, fan equipment may be shipped from the factory either assembled as a unit or as sub-assemblies. The fan manufacturer provides sufficient protection for shipping the equipment to the jobsite. However, if the equipment is not installed and operated within several days, additional precautions are necessary.
Specifications should identify any conditions associated with non-use or storage of the equipment. Precautions may include specifying added protection by the fan manufacturer such as special crating, rust preventative on bare metal parts, special wrapping using tarps, silica gel bags to limit moisture and special covers over the inlets/outlets.
Once the equipment has arrived at the jobsite, but is not installed and placed in operation, the rotor (impeller and shaft) should be rotated by hand periodically to re-coat all lubricated parts with grease and to minimize brinnelling in anti-friction bearings. For assembled fans located in a dirty/moist/cold location, the equipment should be covered and bearings filled with grease to minimize contamination from outside elements. Before start-up, make sure all excess grease is purged out.
Stored motors should follow the specific instructions of the motor manufacturer.
The factory does not recommend use of any plastic to cover equipment. This type covering can cause excessive moisture, condensation, rusting and equipment damage.
In addition the factory recommends that wheels must be blocked to prevent their being rotated by the wind.
Arr. 9 units can be side wall mounted, ceiling suspended by rods, supported upside down from the ceiling or by brackets for a ceiling hung mounting. Warning: For duct support, the fan should be supported by the fan’s integral casing flange, not by a companion flange (for slip duct connection) supplied as an accessory. The duct must be sufficiently braced to support the fan and the motor and to prevent vibration.
IV. INSTALLATION
WARNING! If gases, other than clean air, are to be exhausted using the fan, then the user bears the responsibility of determining that the fan is appropriate and safe for the application.
WARNING! Open all disconnect switches, secure in that position and allow all rotating or revolving equipment to stop before removing belt guard, installing or servicing unit. Failure to do so may result in personal injury or death from electrical shock or rotating parts.
WARNING! The drive motor and V-belt drive components, when supplied with the centrifugal fan, have been carefully selected for this unit’s operating conditions as specified. Changing the drive motor or V-belt drive components could result in unsafe operating conditions which could cause personal injury and/or any of the following:
1. Shaft failure
2. Fan failure
3. Bearing failure
4. Excessive belt wear
5. Motor overload
A. Variable Frequency Drives and Motors
Arr. 9 fans furnished with a mounting base should be firmly bolted to the foundation or vibration mountings.
Warning: For all mountings options, the ducts must be braced sufficiently to support the weight of the fan and motor and to prevent vibration during operation.
C. Elevated Temperatures
Standard steel and aluminum fan construction is good for
-20ºF (-29ºC) to 150ºF (66ºC). Steel fans for handling air up to 300ºF (149ºC) draw outside air through the belt tube and inner cylinder. Therefore, care should be taken so as to not restrict entry to the belt tube. Ambient air should not exceed 100ºF (38ºC).
D. Access
Belts are readily accessible and can be inspected or replaced without disturbing the installation other than to remove belt guards or weatherproof hoods, if they are part of the unit. Access to bearings requires removable door or duct sections at the discharge end of the fan or removal of the unit from the duct system.
E. Fan Wheels
All fan wheels are balanced before shipment. They should fit the shaft snugly. The key should fit both the fan hub and shaft snugly, and the set screws should be tightened to the appropriate torque.
There are occasions when a Variable Frequency Drive (VFD) will cause poor motor performance and possible damage. To avoid these problems, the Company recommends the following:
1. Select compatible motor and VFD inverter; if possible, the motor and the inverter should be from the same manufacturer or at least the inverter selected should be recommended by the motor manufacturer.
2. A motor shaft grounding system should be used to prevent motor bearing damage from eddy currents.
NOTE: The Company will not honor motor warranty claims if the customer fails to follow these recommendations.
B. Types of Mounting Supports
Series QBMX Mixed Flow Fans are designed for horizontal or vertical operation and are so designated by the suffix letter H or V following the size number; i.e. Size QBMX27V. Horizontal (H) units must be installed with the shaft horizontal only. Vertical (V) units can be installed with the shaft vertical to discharge air either up or down, or they can be used with the shaft horizontal. QBMX fans can be furnished with optional vibration isolation, either rubber or spring type. Flexible duct connections should be used when flexible mountings are used.
Rotation of the fan equipment and its corresponding fan wheel is always designated as clockwise viewing it from the drive side in accordance with AMCA Standards.
F. Bearings
Depending upon bearing speed required, anti-friction bearings are grease lubricated at the factory.
If the bearings are received separate from the fan or if they are removed from the fan for any reason, be sure to keep them clean and free from dirt and other contaminants.
G. Alignment
Bearing alignment is critical even on many ball and roller bearings designated as “self-aligning”. On all bearings, if the dust and dirt seals are built into the bearing housing and not part of the race or journal assembly, alignment should center the shaft within one-half the normal radial clearance at the edge of the casing, to prevent excessive dust seal wear and possible shaft scoring.
H. Wheel/Inlet Installation
The wheel/inlet relationship on industrial fans is important if optimum performance is to be obtained. The correct factory placement of these parts can be disturbed by shipment and handling. The inlet should be centered within the wheel radially. Enlarged holes in the inlet bell allow for adjustment of radial clearance when necessary. It is unlikely that the
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wheel should require movement on the shaft to correct the overlap.
I. Drives
Sheaves should be firmly locked in position and the key should fit tightly. Alignment is correct when the fan and motor shafts are parallel and belts are perpendicular to the shaft. A straight edge or taut cord may be used to line up the sheaves. Belts should be under light tension and should feel “live” when thumped. Belts should deflect slightly under light pressure. Excessive tension should never be applied since it will damage the cords and shorten the life of the belts. Never pry the belts over the rim of the sheave, but slack off on the take-up bolts until the belts can be slipped over the rim of the sheaves. Prying the belts over the rim of the sheave may break the cords and shorten the life of the belts and may possibly damage the fan.
For QBMX Mixed Flow Fans with belt tubes, make sure belts are not rubbing against the internal belt guard. On these fans, belt stretch may be taken care of by re-positioning the motor base using the next higher base holes.
J. Fan Pre-Operating Checklist
Without exception, it is recommended that all fans include applicable guards and safety devices. Equipment ordered without the applicable safety devices is clearly the responsibility of the purchaser. Further, the purchaser warrants that he has determined and acquired any and all safety devices required for equipment purchased.
Before putting the fan into operation, remove any shipping wire or blocking holding the wheel and turn it by hand to be sure it is free and not rubbing against the casing or inlet. Check for tightness of the wheel on the shaft. Be sure bearings are lubricated and in alignment. Check tightness of bearing collars as they may loosen during shipment. Check coupling, belts or applicable drive for alignment.
It is advisable to check fan rotation before final duct connections are made. This is readily done by a momentary application of electrical current to the driving motor. The wheel should rotate clockwise when looking in the discharge in accordance with AMCA nomenclature.
Factory mounted motors on fans may shift during shipment requiring a check of the V-belt alignment and tension. Re-position the motor for proper alignment and belt tension if necessary. Re-position the motor on its base to take care of belt tension.
Check wheel rotation when starting the unit to be sure it conforms to the direction of the rotation arrow on the casing.
Check bearing hold-down bolts and the locking collars or other devices for tightness. Be sure to check the bearing for lubrication. See the included bearing instruction book for details.
The operation of the vane control should be checked before the fan is started to make sure that all links are free, that the operation is smooth, and that there is no distortion of the casing to cause any binding. See the vane control installation manual for details.
K. Set Screw Tightening Schedule
2. After 500 operating hours or three months, whichever comes first, tighten set screws to the full recommended torque.
3. At least once a year, tighten set screws to the full recommended torque.
Procedure for Tightening Set Screws in Bearings and Hubs
One Set Screw Application
Using a torque wrench, tighten the set screw to the torque recommended in Table 1.
Two Set Screw Application
1. Using a torque wrench, tighten one set screw to half of the torque recommended in Table 1.
2. Tighten the second set screw to the full recommended torque.
3. Tighten the first set screw to the full recommended torque.
Table 1. Recommended Tightening Torque for
Set Screws
Set Screw Diameter Torque (in-lbs)
#10 35
1/4 80
5/16 126
3/8 240
7/16 384
1/2 744
9/16 1080
5/8 1500
3/4 2580
7/8 3600
1 5400
V. START-UP OPERATION CHECKLIST
Before putting any fan into initial operation the above instructions must be followed. In addition, the following check list must be completed.
A. Lock out the primary and all secondary power sources.
B. A complete inspection shall be made of all of the ductwork
and the interior of the fan. Make certain there is no foreign material which can be drawn into or blown through the fan or ductwork. Eyes should be protected against undetected foreign material with safety goggles or other appropriate means.
C. Make sure the mounting arrangement and the duct
connections are adequately designed in accordance with the recognized acceptable engineering practices and with the Company’s recommendations.
D. Check and tighten all hold-down/securing bolts.
E. Check the fan assembly and bearings for proper grounding
to prevent static electricity discharge.
F. Spin the impeller to determine whether it rotates freely and
is not grossly out of balance.
1. Before initial operation of the fan, tighten set screws according to the procedure outlined below.
G. Inspect the impeller for proper rotation. Wheel rotates
CCW as viewed from the inlet or wheel.
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