PN 463277
Model NYD & NYB
®
Tamper-Resistant Centrifugal Roof Exhaust
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting
to assemble, install, operate or maintain the product described. Protect yourself and others by
observing all safety information. Failure to comply with instructions could result in personal injury
and/or property damage!
Model NYD
Direct Drive
Model NYB
Belt Drive
Model NYB is a belt drive centrifugal
roof exhaust fan. These fans are
Model NYD is
a
direct drive
centrifugal roof exhaust fan. These
specificallydesignedforapplications
fans are specifically designed
wheretamperresistanceisnecessary.
for applications where tamper
Performance capabilities range up to
resitance is necessary. Performance
8,000 cfm (13,592 m3/hr) and up to
capabilities range up to 3,000 cfm
(5,097 m3/hr) and up to 1.0 in. wg
1.0 in. wg (249 Pa) of static pressure.
The maximum continuous operating temperature is
180°F (82°C). NYB fans are available in four sizes with
nominal wheel diameter ranging from 11 to 24 inches
(279 to 610 mm) (100 - 240 unit sizes). Each fan shall
bear a permanently affixed manufacturer’s engraved
metal nameplate containing the model number and
individual serial number.
(249 Pa) of static pressure. The maximum continuous
operating temperature for fan sizes 075-140 is 180°F
(82°C). NYD fans are available in six sizes with
nominal wheel diameter ranging from 8 to 14 inches
(203 to 356 mm) (075 - 140 unit sizes). Each fan shall
bear a permanently affixed manufacturer’s engraved
metal nameplate containing the model number and
individual serial number.
General Safety Information
Only qualified personnel should install this fan.
Personnel should have a clear understanding of
these instructions and should be aware of general
safety precautions. Improper installation can result
in electric shock, possible injury due to coming in
contact with moving parts, as well as other potential
hazards. Other considerations may be required
if high winds or seismic activity are present. If
more information is needed, contact a licensed
professional engineer before moving forward.
1. Follow all local electrical and safety codes, as
well as the National Electrical Code (NEC) and
the National Fire Protection Agency (NFPA),
where applicable. Follow the Canadian Electric
Code (CEC) in Canada.
2. The rotation of the wheel is critical. It must be
free to rotate without striking or rubbing any
stationary objects.
3. Motor must be securely and adequately
grounded.
4. Do not spin fan wheel faster than max cataloged
fan RPM. Adjustments to fan speed significantly
effects motor load. If the fan RPM is changed,
the motor current should be checked to make
sure it is not exceeding the motor nameplate
amps.
DANGER
Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power source
can result in fire, shock or serious injury.
CAUTION
5. Do not allow the power cable to kink or come
in contact with oil, grease, hot surfaces,
or chemicals. Replace cord immediately if
damaged.
6. Verify that the power source is compatible with
the equipment.
When servicing the fan, motor may be hot enough to
cause pain or injury. Allow motor to cool before servicing.
CAUTION
Precaution should be taken in explosive atmospheres.
7. Never open access doors to a duct while the fan
is running.
Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
1
The unit should be stored at least 3½ inches
(89 mm) off the floor on wooden blocks covered with
moisture proof paper or polyethylene sheathing.
Aisles between parts and along all walls should
be provided to permit air circulation and space for
inspection.
Pre-Starting Checks
1. Check all fasteners and setscrews for tightness.
The wheel should rotate freely and be aligned
as shown in figure 2.
Wheel Overlap Dimensions
Model
G - Overlap in. (mm)
H - Gap in. (mm)
Outdoor
NYD 075-090
NYD 075-140
NYB 100-140
NYB 180-240
-
3/32 (2)
Fans designed for outdoor applications may be
stored outdoors, if absolutely necessary. Roads or
aisles for portable cranes and hauling equipment are
needed.
-
1/4 (6)
1/4 (6)
3/8 (10)
-
-
The fan should be placed on a level surface to
prevent water from leaking into the fan. The fan
should be elevated on an adequate number of
wooden blocks so that it is above water and
snow levels and has enough blocking to prevent
it from settling into soft ground. Locate parts far
enough apart to permit air circulation, sunlight
and space for periodic inspection. To minimize
water accumulation, place all fan parts on blocking
supports so that rain water will run off.
G
H
Figure 2
2. Wheel position is preset and the unit is test
run at the factory. Movement may occur during
shipment and realignment may be necessary.
Do not cover parts with plastic film or tarps as these
cause condensation of moisture from the air passing
through heating and cooling cycles.
3. Centering can be accomplished by loosening
the bolts holding the drive frame to the shock
mounts and repositioning the drive frame.
Fan wheels should be blocked to prevent spinning
caused by strong winds.
4. Wheel and inlet cone overlap can be adjusted
by loosening the setscrews in the wheel and
moving the wheel to the desired position.
Inspection and Maintenance During
Storage
While in storage, inspect fans once per month. Keep
a record of inspection and maintenance performed.
5. Check wheel rotation by momentarily energizing
the unit. Rotation should be clockwise as shown
in figure 3 and correspond to the rotation decal
on the unit. Rotation is determined when the
unit is viewed from the motor or shaft pulley
side. If wheel rotation is incorrect reverse two
of the wiring leads or check motor wiring for
single-phase.
If moisture or dirt accumulations are found on parts,
the source should be located and eliminated. At
each inspection, rotate the wheel by hand ten to
fifteen revolutions to distribute lubricant on motor. If
paint deterioration begins, consideration should be
given to touch-up or repainting. Fans with special
coatings may require special techniques for touch-
up or repair.
Wheel Rotation (view from top of fan)
Machined parts coated with rust preventive should
be restored to good condition promptly if signs of
rust occur. Immediately remove the original rust
preventive coating with petroleum solvent and
clean with lint-free cloths. Polish any remaining
rust from surface with crocus cloth or fine emery
paper and oil. Do not destroy the continuity of the
®
surfaces. Thoroughly wipe clean with Tectyl 506
(Ashland Inc.) or the equivalent. For hard to reach
internal surfaces or for occasional use, consider
using Tectyl 511M Rust Preventive, WD-40® or the
Clockwise
Airflow
Counterclockwise
Airflow
®
equivalent.
NYD 60-130
All NYB Models
NYD 140
Removing From Storage
Figure 3
As fans are removed from storage to be installed
in their final location, they should be protected
and maintained in a similar fashion until the fan
equipment goes into operation.
WARNING
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible burnout.
Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
3
®
13. The adjustable motor pulley is factory set for
the RPM specified. Speed can be increased by
closing or decreased by opening the adjustable
motor pulley. Two groove variable pitch pulleys
must be adjusted an equal number of turns open
or closed.
Model NYB
Pre-Starting Belt Tension Checks
6. Always loosen tension enough to install belts
without stretching, see figure 4.
Belts
14. Any increase in speed represents a substantial
increase in the horsepower required by the unit.
15. Motor amperage should always be checked to
avoid serious damage to the motor when speed is
varied.
Do not force belt(s). Forcing the
belt(s) will break the cords and
cause belt failure
Figure 4
WARNING
7. For units with two groove pulleys, adjust so the
tension is equal in both belts.
The fan has been checked for mechanical noises at
the factory prior to shipment. If mechanical noise
should develop, suggested corrective actions are
offered in the Troubleshooting section.
8. If adjustments are made, it is very important
to check the pulleys for proper alignment.
Misaligned pulleys lead to excessive belt wear
vibration, noise and power loss, see figure 5.
IMPORTANT
Over tightening will cause excessive bearing wear
and noise. Too little tension will cause slippage at
start-up and uneven wear.
Operation: NYD/NYB
1. Before starting or operating fan, check all
fasteners for tightness. In particular, check
the setscrews in wheel hub (and pulleys, if
applicable).
Figure 5
9. Belt tension can be adjusted by loosening four
fasteners on the drive frame, see figure 6. This
allows the motor plate to slide on the drive
frame angles for proper positioning.
2. While in the OFF position or before connecting
the fan to power, turn the fan wheel by hand
to be sure it is not striking the venturi or any
obstacle.
3. Start the fan and shut it off immediately to check
rotation of the wheel with directional arrow in the
motor compartment, see figure 3 on page 3.
Fasteners
(4) *Fasteners
4. When the fan is started, observe the operation
and check for any unusual noises.
*Identical
fasteners on
opposing side
must also be
loosened.
5. With the system in full operation and all
ductwork attached, measure current input to the
motor and compare with the nameplate rating to
determine if the motor is operating under safe
load conditions.
Figure 6
6. Keep inlets and approaches to fan clean and
free from obstruction.
10. Belt tension should be adjusted to allow 1/64
inch (0.397 mm) of deflection per inch of belt
span. For example, a 15 inch (381 mm) belt span
should have 15/64 inch (0.234 mm) (or about
1/4 inch (6 mm)) of deflection with moderate
thumb pressure at mid-point between pulleys, see
figure 7.
Inspection: NYD/NYB
Inspection of the fan should be conducted at the
first 30 minute and 24 hour intervals of satisfactory
operation.
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts.
Adjust and tighten as necessary.
Deflection
24 Hour Interval
Check all internal components. On NYB unit only,
inspect belt alignment and tension. Adjust and
tighten as necessary.
Figure 7
4
Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
®
5. Shaft bearings can be classified in two groups:
relubricating and non-relubricating. All bearings
are factory lubricated and require no further
lubrication under normal use (between -20ºF and
180ºF in a relatively clean environment).
IMPORTANT
Adjust (tighten) belt tension after the first
24-48 hours of operation.
Maintenance: NYD/NYB
6. Units installed in hot, humid or dirty locations
should be equipped with special bearings.
These bearings will require frequent lubrication.
A proper maintenance program will help these units
deliver years of dependable service. Installation and
maintenance are to be performed only by qualified
personnel who are familiar with local codes and
regulations and who are experienced with this type
of equipment.
7. On NYB belt driven fans, the standard cast
pillow block bearings are factory lubricated
and are provided with external grease fittings.
Annual lubrication is recommended, or more
frequently if needed, see Table 2. Do not over-
grease. Use only one or two shots of lubricant
with a hand gun. Maximum hand gun rating
is 40 psi. Rotate bearings during lubrication
where good safety practice permits. Caution
should be employed to prevent over packing or
contamination.
Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Cleaning should
be limited to exterior surfaces only. Removing dust
buildup on motor housing ensures proper motor
cooling.
Greasing of motors is only intended when fittings
are provided. Many fractional horsepower motors
are permanently lubricated and should not be
lubricated after installation. Motors supplied with
grease fittings should be greased in accordance
with manufacturers’ recommendations. Where
motor temperatures do not exceed 104ºF (40ºC),
the grease should be replaced after 2,000 hours of
running time as a general rule.
7. Grease fittings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
8. Grease should be pumped in very slowly until a
slight bead forms around the seal. A high grade
lithium base grease should be used.
9. To ensure tightness, check pulley setscrews.
Proper keys must be in keyways.
Direct drive units require little maintenance except
for cleaning wheel, alignment and oiling according
to motor label instructions.
10. Fan RPM should not be readjusted. Only use
pulleys of identical size and type when replacing
pulleys.
The unit should be made non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off, etc.).
11. During the first few months of operation check
bearing setscrews periodically to ensure
tightness.
Wheels require very little attention when moving
clean air. Occasionally, oil and dust may accumulate
causing imbalance. When this occurs the wheel and
housing should be cleaned to ensure smooth and
safe operation.
12. If unit is to be left idle for an extended period,
remove belts and store in a cool, dry place to
avoid premature belt failure.
All fasteners should be checked for tightness each
time maintenance checks are performed prior to
restarting unit.
WARNING
Always disconnect, lock and tag power source
before servicing. Failure to disconnect power
source can result in fire, shock or serious injury.
A proper maintenance program will help these units
deliver years of dependable service.
CAUTION
Belt/Bearing Maintenance NYB Unit
Uneven cleaning of the wheel will produce an out
of balance condition that will cause vibration in the
fan.
1. Belts tend to stretch after a period of time. They
should be checked periodically for wear and
tightness. When replacing belts, use the same
type as supplied with the unit.
WARNING
This unit should be made non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off).
2. Matched belts should always be used on units
with multi-groove pulleys.
3. For belt replacement, loosen the tensioning
device enough to allow removal of the belt by
hand. Do not force the belts on or off. This may
cause cords to break, leading to premature
failure.
4. Once installed, adjust belts as shown in
“Pre-Starting Checks.”
Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
5
®
Recommended Relubrication
Frequency in Months
NOTE: If unusual environment conditions exist more
frequent lubrication is required (extreme
Table 3: Grease Manufacturers
Manufacturer
Grease (NLGI #2)
U.S. Electric Motors
Chevron U.S.A. Inc
Grease No. 83343
Chevron SRI Grease #2
Mobilith
temperature, moisture or contaminants).
Mobil Oil Corporation
Texaco, Inc.
Mobil 532
A good quality lithium base grease,
conforming to NLGI Grade 2 consistency,
such as those listed here may be used.
Premium BRB #2
Texaco Multifak #2
Rykon Premium #2
Unirex N2
Amoco Oil Co.
Exxon
Table 2: Suggested Fan Bearing Greasing Intervals
Shell
B Shell Alvania #2
Interval
Type of Service
(months)
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere;
vibration.
1 to 3
12 to 24 hours per day, heavy duty, or if moisture
is present
3 to 6
6 to 12
12 to 18
8 to 16 hours per day in clean, relatively dry
atmosphere
Infrequent operation or light duty in clean
atmosphere
Troubleshooting
WARNING: Before taking any corrective action, make certain unit is not capable of operation during
repairs.
PROBLEM
CAUSE
CORRECTIVE ACTION
Bad Bearings
Replace.
Clean and remove all dirt buildup off wheel. Check wheel
balance, rebalance in place if necessary.
Wheel unbalance
Belts too tight or too loose
Adjust tension, see figure 7.
Excessive Noise
or Vibration
Wheel improperly aligned and
rubbing
Center wheel on inlet, see figure 2.
Loose drive or motor pulleys
Align and tighten. See “Pre-Starting Checks”, see page 3-4.
Remove objects, check for damage or unbalance.
Foreign objects in wheel or
housing
Check system: Proper operation of backdraft or control
dampers, obstruction in ductwork, etc.
System resistance too high
Unit running backwards
Correct as shown in figure 3.
Reduced airflow
Excessive dirt buildup on wheels Clean wheel.
Improper wheel alignment Center wheel on inlets, see Pre-Starting checks and figure 2.
6
Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
®
Parts List
NOTE: Each fan bears a manufacturer’s nameplate with model number and serial number embossed. This information
will assist the local Greenheck representative and the factory in providing service and replacement parts.
Before taking any corrective action, make certain unit is not capable of operation during repairs.
CAUTION: A fan manufactured with an explosion resistant motor does not certify the entire unit to be explosion proof.
NYB Belt Drive Centrifugal Roof Exhaust Fan
HOOD
PULLEY
BEARING
DRIVE FRAME
BELT
FAN SHAFT
MOTOR
ISOLATORS
WHEEL
WIRING CONDUIT
HOUSING
BIRDSCREEN
SUPPORT FRAME
CURB CAP
Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
7
®
Parts List
NOTE: Each fan bears a manufacturer’s nameplate with model number and serial number embossed. This information
will assist the local Greenheck representative and the factory in providing service and replacement parts.
Before taking any corrective action, make certain unit is not capable of operation during repairs.
CAUTION: A fan manufactured with an explosion resistant motor does not certify the entire unit to be explosion proof.
NYD Direct Drive Centrifugal Roof Exhaust Fan
HOOD
MOTOR
DRIVE FRAME
ISOLATORS
WIRING CONDUIT
WHEEL
HOUSING
BIRDSCREEN
SUPPORT FRAME
CURB CAP
Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period
of one year from the purchase date. Any units or parts which prove defective during the warranty
period will be replaced at our option when returned to our factory, transportation prepaid. Motors are
warranted by the motor manufacturer for a period of one year. Should motors furnished by Greenheck
prove defective during this period, they should be returned to the nearest authorized motor service
station. Greenheck will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides additional
safety information. This publication can be obtained from AMCA
Greenheck Catalog NYD & NYB provides additional information
describing the equipment, fan performance, available accessories,
and specification data.
®
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: [email protected] • Website: www.greenheck.com
8
463277 • NYD & NYB, Rev. 2, December 2008
Copyright 2008 © Greenheck Fan Corp
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