Power Roof Ventilator
Installation, Operation, and Maintenance Manual
Up-blast Centrifugal Fan
Down
-
blast Centrifugal Fan
Save these
instructions
RECEIVING AND INSPECTION
WARNING!!
Axial Fan
Upon receiving unit, check for any interior and exterior damage, and if found, report it
immediately to the carrier. Also check that all accessory items are accounted for and are
damage free. Turn the blower wheel by hand to verify free rotation and check the damper (if
supplied) for free operation.
Installation of this ventilator should only be performed by a qualified professional who has
read and understands these instructions and is familiar with proper safety precautions.
Improper installation poses serious risk of injury due to electric shock, contact with rotating
equipment, and other potential hazards. Read this manual thoroughly before installing or
servicing this equipment. ALWAYS disconnect power prior to working on fan.
. This document is the property of the owner of this equipment and is
required for future maintenance. Leave this document with the owner when installation or
service is complete.
A0011032
July 2010 Rev. 4
2
3
TABLE OF CONTENTS
WARRANTY ............................................................................................................................................ 4
INSTALLATION ....................................................................................................................................... 5
Mechanical .......................................................................................................................................... 5
Site Preparation .............................................................................................................................. 5
Roof Mounting ................................................................................................................................. 5
Wall Mounting ................................................................................................................................. 6
Curb and Ductwork ......................................................................................................................... 6
Up-Blast Roof Mount Installation ..................................................................................................... 7
Up-Blast Wall Mount Installation ...................................................................................................... 7
Up-Blast Through Wall Installation ................................................................................................... 8
Down-Blast Installation .................................................................................................................... 8
Typical Hinge Kit ............................................................................................................................. 9
Typical Grease Box Installation ....................................................................................................... 9
Electrical ........................................................................................................................................... 10
Copper Wire Ampacity .................................................................................................................. 10
Speed Control ............................................................................................................................... 11
Motorized Damper ......................................................................................................................... 11
Fan to Building Wiring Connection ................................................................................................. 12
OPERATION ......................................................................................................................................... 13
Start Up ............................................................................................................................................. 13
Special Tools Required ................................................................................................................. 13
Start Up Procedure ....................................................................................................................... 13
Pulley Adjustment (Belt Drive Fans) .............................................................................................. 14
Pulley Alignment ........................................................................................................................... 14
Proper Belt Tension ...................................................................................................................... 14
Pulley Setscrew Torque................................................................................................................. 14
Pulley Combination Chart .............................................................................................................. 15
Troubleshooting ................................................................................................................................ 16
Troubleshooting Chart ................................................................................................................... 16
MAINTENANCE .................................................................................................................................... 17
General Maintenance ........................................................................................................................ 17
Bearing Grease Charge................................................................................................................. 17
Bearing Grease Type .................................................................................................................... 17
2 weeks after startup ......................................................................................................................... 17
Every 3 months ................................................................................................................................. 18
Yearly................................................................................................................................................ 18
Start-Up and Maintenance Documentation ........................................................................................ 20
Job Information ............................................................................................................................. 20
Fan Unit Information ...................................................................................................................... 20
Maintenance Record ..................................................................................................................... 20
Factory Service Department .......................................................................................................... 20
4
WARRANTY
This equipment is warranted to be free from defects in materials and workmanship, under normal use and
service, for a period of 12 months from date of shipment. This warranty shall not apply if:
1. The equipment is not installed by a qualified installer per the MANUFACTURER’S installation
instructions shipped with the product,
2. The equipment is not installed in accordance with federal, state and local codes and regulations,
3. The equipment is misused or neglected,
4. The equipment is not operated within its published capacity,
5. The invoice is not paid within the terms of the sales agreement.
The MANUFACTURER shall not be liable for incidental and consequential losses and damages
potentially attributable to malfunctioning equipment. Should any part of the equipment prove to be
defective in material or workmanship within the 12-month warranty period, upon examination by the
MANUFACTURER, such part will be repaired or replaced by MANUFACTURER at no charge. The
BUYER shall pay all labor costs incurred in connection with such repair or replacement. Equipment shall
not be returned without MANUFACTURER’S prior authorization and all returned equipment shall be
shipped by the BUYER, freight prepaid to a destination determined by the MANUFACTURER.
5
INSTALLATION
It is imperative that this unit is installed and operated with the designed airflow and electrical supply in
accordance with this manual. If there are any questions about any items, please call the service
department at 1-866-784-6900 for warranty and technical support issues.
Mechanical
WARNING: DO NOT RAISE VENTILATOR BY THE HOOD, BLOWER OR MOTOR
SHAFT, OR BEARINGS – USE LIFTING LUGS PROVIDED OR A SLING
Site Preparation
1. Provide clearance around installation site to safely rig and lift equipment into its final position.
Supports must adequately support equipment. Refer to manufacturer’s estimated weights.
2. Consider general service and installation space when locating unit.
3. Locate unit close to the space it will serve to reduce long, twisted duct runs.
4. The fan discharge must be located at least 10 feet away from any supply intakes. The fan
discharge shall be located in accordance with the applicable building code provisions.
Roof Mounting
1. Ventilators are designed for installation atop a prefabricated or factory built roof curb. Follow
manufacturer’s instructions for proper curb installation.
2. If a backdraft damper is required, it should be secured within the curb using sheet metal screws,
to the bottom of a damper box or damper support flanges located below the roof deck.
CAUTION: NFPA-96 RECOMMENDS THAT DAMPERS SHOULD NOT BE INSTALLED
WHEN EXHAUSTER IS USED FOR REMOVAL OF SMOKE AND GREASE LADEN VAPORS
FROM COMMERCIAL KITCHEN EQUIPMENT. CONSULT STATE AND LOCAL CODES
FOR DETAILED REQUIREMENTS.
3. If an up-blast fan is used for kitchen hood exhaust, ensure discharge is at least 40 inches above
the roof surface in accordance with NFPA96.
4. On an up-blast fan, normally the power cord is brought through the conduit tube located on the
top skirt on the outside of the unit.
5. Secure ventilator curb through vertical portion of the ventilator base assembly flange using a
minimum of eight (8) lug screws, anchor bolts, or other suitable fasteners (not furnished).
6. Before connecting fan motor to power source verify power line wiring is de-energized.
7. Connect power supply wiring to the motor as indicated on the motor nameplate or terminal box
cover. Make certain that the power source is compatible with the requirements of your
equipment.
8. Before powering up fan check ventilator wheel for free rotation.
9. Check all fasteners for tightness.
10. Re-install motor dome.
11. A drain pipe is provided for single-point drainage of water and residue on up-blast fans. The
drain pipe should be positioned towards the roof slope. Some means for collection of this
residue must be provided, either a container directly under the trough or use of an adapter and
pipe to carry the residue to a remote collection point. An optional down spout and grease
collection box is available as an accessory item for up-blast fans.
6
Wall Mounting
1. The same instructions, warnings and notes found under Roof Mounting section will apply. Refer
to steps 2 and 3, and steps 5 through 8.
2. Masonry Wall: Around the wall opening install an angle iron frame at least 2” x2” x ¼”. Frame
should be approximately 1/2” smaller than the inside base dimension of the ventilator. Secure the
lead cinch type anchors with non-ferrous bolts (3 per side). The ventilator should be mounted to
the mounting angle with self-taping sheet metal screws (3 per side).
3. Wood Sidings: Around the wall opening install a wooden frame 2” high x 2” wide. Frame should
be approximately 1/2” smaller than the inside base dimension of the ventilator. Secure with
counter-sunk expansion type lag bolts (3 per side). The ventilator should then be mounted to the
mounting frame with the square head wood screws (3 per side) 3/8” minimum.
4. Steel wall mount brackets are also available as a factory option for the fan.
5. The mounting flange connections should be coated with a suitable caulking compound or an
approved waterproof mastic sealer.
6. Wall mount application is not recommended from fans with wheels 30” or larger.
IMPORTANT: OSHA REGULATIONS REQUIRE THE VENTILATOR TO BE MOUNTED AT LEAST
EIGHT (8) FEET ABOVE GROUND OR FLOOR LEVEL.
Curb and Ductwork
This fan was specified for a specific CFM and static pressure. The ductwork attached to this unit will
significantly affect the airflow performance. Flexible ductwork and square elbows should not be used.
Also, transitions and turns in ductwork near
the fan inlet will cause system effect and
will drastically increase the static pressure
and reduce airflow. Follow SMACNA
guides and recommendations for the
remaining duct run. Fans designed for
rooftop installation should be installed on a
prefabricated or factory built roof curb.
Follow curb manufacturer’s instructions for
proper curb installation. Curbs should be
connected to structural roof members with
at least four (3) lug screws, anchor bolts, or
other suitable fasteners (not furnished) per
curb flange. Curb flanges should be
caulked to roof.
The fan should be installed on a curb and/or
rail elevated not less than 14” above any surface. Be sure duct connection and fan outlet are properly
aligned and sealed. Secure fan to curb through vertical portion of the ventilator base assembly flange
using a minimum of eight (8) lug screws, anchor bolts, or other suitable fasteners (not furnished). Shims
may be required depending upon curb installation and roofing material. Check all fasteners for tightness.
The diagrams below show different mechanical installation configurations.
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Up-Blast Roof Mount Installation
Up-Blast Wall Mount Installation
8
Up-Blast Through Wall Installation
Down-Blast Installation
9
Typical Hinge Kit
Typical Grease Box Installation
10
Electrical
WARNING!!
Before connecting power to the fan, read and understand this
entire section of this document. As-built wiring diagrams are
available with each fan by the factory.
Electrical wiring and connections should be done in
accordance with local ordnances and the National Electric
Code, ANSI/NFPA70. Be sure the voltage and phase of the
power supply and the wire amperage capacity is in accordance
with the motor nameplate. For additional safety information
refer to AMCA publication 410-96, Recommended Safety
Practices for Users and Installers of Industrial and Commercial
Fans.
1. Always disconnect power before working on or near a
fan. Lock and tag the disconnect switch or breaker to
prevent accidental power up.
2. A disconnect switch is shipped with every fan. The
switch is located on the exterior of up-blast fans and in
the interior of down-blast fans. On down-blast direct
drive fans, the disconnect function is built into the
speed controller.
3. A dedicated branch circuit should supply the motor circuit with short circuit protection according to
the National Electric Code. This dedicated branch should be run to the junction box mentioned
above and connected as shown in a following illustration labeled “Fan to Building Wiring
Connection”.
4. Make certain that the power source is compatible with the requirements of your equipment. The
fan nameplate identifies the proper phase and voltage of the motor.
5. Before connecting fan to building power source, verify power line wiring is de-energized.
6. Secure the power cable to prevent contact with sharp objects.
7. Do not kink power cable and never allow the cable to come in contact with oil, grease, hot
surfaces or chemicals.
8. Before powering up fan check fan wheel for free rotation and make sure that the interior of the fan
is free of loose debris or shipping materials.
9. If any of the original wire supplied with the fan must be replaced, it must be replaced with type
TW wire or equivalent.
Disconnect power before
installing or servicing fan. High
voltage electrical input is
needed for this equipment. This
work should be performed by a
qualified electrician.
Copper Wire Ampacity
Wire Size AWG Maximum Amps
14 20
12 25
10 30
8 40
6 55
4 70
IMPORTANT: FANS WITH HINGE KITS REQUIRE ENOUGH SLACK IN THE
WIRING TO THE FAN TO ALLOW FAN TO TILT BACK TO THE OPEN POSITION.
ELECTRICIAN MUST CHECK THIS AND ACCOUNT FOR THE RANGE OF MOTION
OF THE FAN.
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Speed Control
Some single phase direct drive fans contain speed controls that regulate the amount of voltage going to
the motor. Specific motors must be used in conjunction with speed controls. The speed control has a
knob with an off position, and high to low range. At high speed, the speed control allows all of the line
voltage to pass right to the motor.
A minimum speed adjustment is provided to allow independent control of the minimum speed setting.
Minimum speed adjustment ensures motor runs with sufficient torque to prevent stalling. To adjust this:
1) Motor must be in actual operating conditions to achieve proper speed adjustment. Motor will not
slow down unless proper load is applied.
2) Turn main control knob to lowest speed position.
3) Locate and adjust minimum speed setting and adjust with small screw driver. This can be found
under the speed control faceplate. (rotate clockwise to decrease minimum speed; counterclockwise to increase minimum speed).
4) Motor will now operate from this preset minimum speed to full speed.
The lowest minimum voltage that may be applied to these motors is 65VAC. Running lower
voltages to the motor can cause premature failure and overheating problems.
To adjust the speed of 3 phase direct drive motors, a variable frequency drive is required.
Motorized Damper
On units shipped with the optional motorized damper, power must be supplied to the damper according to
the damper nameplate. The damper motor is controlled external to the fan. External wiring to the
damper motor is required.
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Fan to Building Wiring Connection
13
Pulley Adjustment Illustration
OPERATION
Prior to starting up or operating the ventilator, check all fasteners for tightness. In particular, check the set
screw in the wheel hub, bearings and the fan sheaves (pulleys). With power to the fan OFF or prior to
connecting ventilator to power, turn the fan wheel by hand to be sure it is not striking the inlet or any
obstacles. Re-center if necessary.
Start Up
Special Tools Required
• AC Voltage Meter
• Tachometer
• Amperage Meter
• Standard Hand Tools
Start Up Procedure
1. Check all electrical connections for tightness and continuity.
2. Check pulley alignment and belt tension as described below for belt drive fans.
3. Inspect the condition of the damper and damper linkage, if provided.
4. Inspect the air-stream for obstructions or debris in wheel.
5. Compare the supplied voltage with the fan’s nameplate voltage. If this does not match, correct
the problem.
6. Start the fan up, by turning the external disconnect to the ON position, and shut it OFF
immediately to check rotation of the wheel with the directional arrow on the blower scroll.
Reversed rotation will result in poor air performance, motor overloading and possible burnout.
For units equipped with a single-phase motor check the motor wiring diagram to change rotation.
For 3-phase motors, any two power leads can be interchanged to reverse motor direction.
7. When the fan is started up, observe the operation and check for any unusual noises.
8. Switch the external disconnect back to the ON position and with the air system in full operation
and all ducts attached, measure the system airflow. Motor sheave (pulley) is variable pitch, and
allows for an increase or decrease of the fan RPM to adjust the airflow, as shown in the
illustration below. For your convenience, a RPM chart is included in the following pages. If the
fan is a direct drive version, it may have a speed control to adjust speed.
9. Once the proper airflow is achieved, measure and record the fan speed with a reliable
tachometer. Caution - Excessive speed will result in motor overloading or bearing failure.
Do not set fan RPMs higher than specified in the maximum RPM chart. See the
troubleshooting guide for more information.
10. Measure and record the voltage and amperage to the motor and compare with the motor
nameplate to determine if the motor is operating under safe load condition.
11. Once the rpm of the ventilator has been properly set, disconnect power and recheck belt tension
and pulley alignment as described below.
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Pulley Adjustment (Belt Drive Fans)
The adjustable motor pulley is factory set for the RPM specified.
Speed can be increased by closing or decreased by opening the
adjustable motor sheave. Two groove variable pitch pulleys must
be adjusted an equal number of turns open or closed. Any
increase in speed represents a substantial increase in
horsepower required by the unit. Motor amperage should always
be checked to avoid serious damage to the motor when the
speed is varied. Always torque setscrews according to the
setscrew torque chart.
Pulley Alignment
Pulley Setscrew Torque
Thread Size Torque (IN/Lb)
No. 10 (bushing) 32
1/4” (bushing) 72
5/16” 130
Proper Belt Tension
15
Pulley Combination Chart
Motor RPM 1725
1/3 to 1-1/2 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
AX BELTS 1VL34 1.9 2.9 2 3
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
AK114 11 11.2 308 323 339 354 370 385 400 416 431 447 462
1/3 to 1-1/2 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
AX BELTS 1VL40 2.4 3.4 2.6 3.6
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
AK114 11 11.2 400 416 431 447 462 477 493 508 524 539 554
AK94 9 9.2 488 506 525 544 563 581 600 619 638 656 675
AK79 7.5 7.7 582 605 62 7 650 672 694 717 739 762 784 806
AK66 6.2 6.4 701 728 75 5 782 809 836 863 889 916 943 970
AK54 5 5.2 863 896 929 962 995 1028 1062 1095 1128 1161 1194
AK46 4.2 4.4 1019 1059 1098 1137 1176 1215 1255 1294 1333 1372 1411
AK39 3.5 3.7 1212 1259 1305 1352 1399 1445 1492 1539 1585 1632 1678
AK32 3 3.2 1402 1455 1509 156 3 1617 1671 1725 1779 1833 1887 1941
2 to 5 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
BX BELTS 2VP42 2.9 3.9 3 4
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 6 5 1/2 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
2BK160H 15.4 15.7 330 339 348 357 366 3 75 385 394 403 412 42 1 430 439
2BK140H 13.4 13.7 378 388 399 409 420 4 30 441 451 462 472 48 3 493 504
2BK120H 11.4 11.7 442 455 467 479 491 5 04 516 528 541 553 56 5 577 590
2BK110H 10.4 10.7 484 497 511 524 537 5 51 564 578 591 605 61 8 631 645
2BK100H 9.4 9.7 534 548 56 3 578 593 608 622 637 652 667 682 697 711
2BK90H 8.4 8.7 595 611 62 8 644 661 677 694 710 727 744 760 777 793
2BK80H 7.4 7.7 672 691 70 9 728 747 765 784 803 821 840 859 877 896
2BK70H 6.4 6.7 772 794 81 5 837 858 880 901 923 944 965 987 1008 1030
2BK60H 5.4 5.7 908 933 95 8 984 1009 1034 1059 1084 1110 1135 1160 1185 1211
2BK55H 4.9 5.2 995 1023 1050 1078 1106 1133 1161 1189 1216 1244 1272 1299 1327
2BK50H 4.4 4.7 1101 1132 1162 1193 1223 1254 1285 1315 1346 1376 1407 1438 1468
7-1/2 to 10 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
BX BELTS 2VP60 4.3 5.5 4.7 5.9
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 6 5 1/2 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
2BK160H 15.4 15.7 516 527 538 549 560 5 71 582 593 604 615 62 6 637 648
2BK140H 13.4 13.7 592 604 617 630 642 6 55 667 680 693 705 71 8 730 743
2BK120H 11.4 11.7 693 708 722 737 752 7 67 781 796 811 826 84 0 855 870
2BK110H 10.4 10.7 758 774 790 806 822 8 38 854 871 887 903 91 9 935 951
2BK100H 9.4 9.7 836 854 87 1 889 907 925 943 960 978 996 1014 1031 1049
2BK90H 8.4 8.7 932 952 97 2 991 1011 103 1 1051 1071 1091 1110 1130 1150 1170
2BK80H 7.4 7.7 1053 1075 1098 1120 1143 1165 1187 1210 1232 1255 1277 1299 1322
3 to 5 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
BX BELTS 2VP42 2.9 3.9 3 4
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 6 5 1/2 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
2B5V278 27.8 28.1 184 189 194 200 205 210 215 220 225 230 235 240 24 6
2B5V250 25 25.3 205 210 216 222 227 233 239 244 250 256 261 267 273
2B5V234 23.4 23.7 218 224 230 237 243 249 255 261 267 273 279 285 29 1
2B5V200 20 20.3 255 262 269 276 283 290 297 304 312 319 326 333 340
2B5V184 18.4 18.7 277 284 292 300 307 315 323 331 338 346 354 361 36 9
2B5V160 16 16.3 317 326 335 344 353 362 370 379 388 397 406 414 423
2B5V154 15.4 15.7 330 339 348 357 366 375 385 394 403 412 421 430 43 9
2B5V136 12.6 12.9 401 412 423 435 446 457 468 479 490 501 513 524 53 5
2B5V124 12.4 12.7 407 419 430 441 453 464 475 487 498 509 521 532 54 3
2B5V110 11 11.3 458 471 483 496 509 522 534 547 560 572 585 598 611
7-1/2 to 10 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
BX BELTS 2VP60 4.3 5.5 4.7 5.9
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 6 5 1/2 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
2B5V278 27.8 28.1 289 295 301 307 313 319 325 331 338 344 350 356 36 2
2B5V250 25 25.3 320 327 334 341 348 355 361 368 375 382 389 395 402
2B5V234 23.4 23.7 342 349 357 364 371 378 386 393 400 408 415 422 42 9
2B5V200 20 20.3 399 408 416 425 433 442 450 459 467 476 484 493 501
2B5V184 18.4 18.7 434 443 452 461 470 480 489 498 507 517 526 535 54 4
2B5V160 16 16.3 497 508 519 529 540 550 561 571 582 593 603 614 624
2B5V154 15.4 15.7 516 527 538 549 560 571 582 593 604 615 626 637 64 8
2B5V136 12.6 12.9 628 642 655 669 682 695 709 722 735 749 762 776 78 9
2B5V124 12.4 12.7 638 652 666 679 693 706 720 733 747 761 774 788 80 1
2B5V110 11 11.3 717 733 748 763 779 794 809 824 840 855 870 885 901
15 to 20 HP MOTOR PULLEY Dd1 Dd2 Pd1 Pd2
BX BELTS 2VP75 5.8 7 6.2 7.4
BLOWER PULLEY DATUM DIAMETER PITCH DIAMETER 6 5 1/2 5 4 1/2 4 3 1/2 3 2 1/2 2 1 1/2 1 1/2 0
2B5V278 27.8 28.1 381 387 393 399 405 411 417 424 430 436 442 448 45 4
2B5V250 25 25.3 423 430 436 443 450 457 464 470 477 484 491 498 505
2B5V234 23.4 23.7 451 459 466 473 480 488 495 502 509 517 524 531 53 9
2B5V200 20 20.3 527 535 544 552 561 569 578 586 595 603 612 620 629
2B5V184 18.4 18.7 572 581 590 600 609 618 627 636 646 655 664 673 68 3
2B5V160 16 16.3 656 667 677 688 698 709 720 730 741 751 762 773 783
2B5V154 15.4 15.7 681 692 703 714 725 736 747 758 769 780 791 802 81 3
2B5V136 12.6 12.9 829 842 856 869 883 896 909 923 936 949 963 976 99 0
Open Closed
Open Closed
Open Closed
Open Closed
Open Closed
Open Closed
Open Closed
TURNS ON MOTOR PULLEY
TURNS ON MOTOR PULLEY
TURNS ON MOTOR PULLEY
TURNS ON MOTOR PULLEY
TURNS ON MOTOR PULLEY
TURNS ON MOTOR PULLEY
TURNS ON MOTOR PULLEY
16
Troubleshooting
d
iagram located on fan motor
design
reduce duct losses
The following table lists causes and corrective actions for possible problems with the fan units. Review
this list prior to consulting manufacturer.
Troubleshooting Chart
Problem
Fan Inoperative Blown fuse or open circuit breaker Replace fuse or reset circuit
Motor Overload Fan rotating in the wrong direction Be sure fan is rotating in the
Insufficient Airflow Fan rotating in the wrong direction Be sure fan is rotating in the
Potential Cause
Disconnect switch in “Off” position Turn to “On” position
Motor wired incorrectly Check motor wiring to wiring
Broken fan belt Replace belt
Motor starter overloaded Reset starter and check amps
Fan speed is too high Reduce fan RPM
Motor wired incorrectly Check motor wiring to wiring
Overload in starter set too low Set overload to motor FLA value
Motor HP too low Determine if HP is sufficient for
Duct static pressure lower than
design
Poor inlet/outlet conditions There should be a straight clear
Damper not fully open Inspect damper linkage and
Duct static pressure higher than
Corrective Action
breaker and check amps
diagram located on fan motor
direction shown on rotation label
job
Reduce fan RPM
direction shown on rotation label
duct at the inlet/outlet
replace damper motor if needed
Improve ductwork to eliminate or
Blower speed too low Increase fan RPM. Do not
overload motor
Belt slippage Adjust belt tension
Excessive Airflow Blower speed to high Reduce fan RPM
Duct static pressure lower than
design
Excessive Vibration and Noise Misaligned pulleys Align pulleys
Damaged or unbalanced wheel Replace wheel
Fan is operating in the unstable
region of the fan curve
Bearings need lubrication or
replacement
Fan speed is too high Reduce fan RPM
Belts too loose, worn or oily Inspect and replace if needed
Reduce fan RPM
Refer to performance curve for
fan
Lubricate or replace
17
MAINTENANCE
To guarantee trouble free operation of this fan, the manufacturer suggests following these guidelines. Most problems
associated with fan failures are directly related to poor service and maintenance.
Please record any maintenance or service performed on this fan in the documentation section located at the end of
this manual.
WARNING: DO NOT ATTEMPT MAINTENANCE ON THE FAN UNTIL THE
ELECTRICAL SUPPLY HAS BEEN COMPLETELY DISCONNECTED
General Maintenance
1. Fan discharge and approaches to ventilator should be kept clean and free from any obstruction.
2. Motors are normally permanently lubricated. Check bearings periodically. If they have grease fittings
lubricate each season. Use caution when lubricating bearings, wipe the fittings clean, the unit should be
rotated by hand while lubricating. Bearings should be lubricated every 2 months. The type of grease and the
amount of grease can is shown below. Caution: Bearings are sealed and over-greasing bearings can
cause damage to the bearings. Do not grease until grease comes out of seals. Only add the
appropriate amount of grease.
3. All fasteners should be checked for tightness each time maintenance checks are preformed prior to
restarting unit.
4. Fans require very little attention when moving clean air. Occasionally oil and dust may accumulate causing
imbalance. If the fan is installed in a corrosive or dirty atmosphere, periodically inspect and clean the wheel,
inlet and other moving parts to ensure smooth and safe operation.
Bearing Grease Charge
Bearing Grease Type
2 weeks after startup
1. Belt tension should be checked after the first 2 weeks of fan operation on belt drive fans. Belts tend to
stretch and settle into pulleys after an initial start-up sequence. Do not tension belts by changing the
setting of the motor pulley, this will change the fan speed and may damage the motor. To re-tension
belts, turn the power to the fan motor OFF. Loosen the fasteners that hold the motor to the fan. Move the
motor to the left or right to adjust the belt tension. Belt tension should be adjusted to allow 1/64” of
deflection per inch of belt span. Exercise extreme care when adjusting V-belts as not to misalign pulleys.
Any misalignment will cause a sharp reduction in belt life and produce squeaky noises. Over-tightening will
cause excessive belt and bearing wear as well as noise. Too little tension will cause slippage at startup and
uneven wear. Whenever belts are removed or installed, never force belts over pulleys without
18
loosening motor first to relieve belt tension. When replacing belts, use the same type as supplied by the
manufacturer. On units shipped with double groove pulleys, matched belts should always be used.
2. All fasteners should be checked for tightness each time maintenance checks are preformed prior to
restarting unit.
Every 3 months
1. Belt tension should be checked quarterly for belt drive fans. See instructions in the previous maintenance
section. Over-tightening will cause excessive bearing wear and noise. Too little tension will cause slippage
at startup and uneven wear.
2. Fans need to be cleaned quarterly, and more often in severe conditions.
Yearly
1. Inspect bearings for wear and deterioration. Replace/grease if necessary.
2. Inspect belt wear and replace torn or worn belts on belt drive fans.
3. Inspect bolts and set screws for tightness. Tighten as necessary.
4. Inspect motor for cleanliness. Clean exterior surfaces only. Remove dust and grease from the motor
housing to ensure proper motor cooling. Remove dirt and grease from the wheel and housing to prevent
imbalance and damage.
19
20
Start-Up and Maintenance Documentation
START-UP AND MEASUREMENTS SHOULD BE PERFORMED AFTER THE SYSTEM HAS BEEN
AIR BALANCED (Warranty will be void without completion of this form)
Job Information
Job Name Service Company
Address Address
City City
State State
Zip Zip
Phone Number Phone Number
Fax Number Fax Number
Contact Contact
Purchase Date Start-Up Date
Fan Unit Information
Refer to the start-up procedure in this manual to complete this section.
Name Plate and Unit Information
Model Number
Serial Number
Volts
Hertz
Phase
FLA
HP
Blower Pulley
Motor Pulley
Belt Number
**
If measured amps exceed the FLA rating on the nameplate, fan RPM must be reduced to decrease the
measured amps below the nameplate FLA rating.
Field Measured Information
Voltage
Amperage**
RPM
Blower Rotation Correct
Incorrect
Maintenance Record
Date Service Performed
Factory Service Department
Phone: 1-866-784-6900
Fax: 1-919-554-9374
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