Part # 455305
READ AND SAVE THESE INSTRUCTIONS
Hooded Propeller Roof Fans
Belt Drive and Direct Drive
GREENHECK
P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410
PH. 715-359-6171
®
Installation, Operating and Maintenance Manual
Upon receiving the unit, check for any damage and report it immediately to the shipper. Also assure all accessory
items are accounted for.
To minimize installation time, most fans are shipped completely assembled. Due to shipping size limitations, hoods for larger
fans will be shipped in sections. For these fans the hood and fan components can be transported to the roof location
separately. Hood assembly should begin after the fan is attached to the roof curb. Hood assembly instructions are included
with the hood components.
Care must be taken not to bend or distort the fan panel or drive components during installation.
All dimensions given in inches
Exhaust /Supply (Direct Drive Sizes 18-54 - Belt Drive Sizes 20-72)
Standard
Base
Tall
A
Damper Roof
Fan
Base
Base
Sq.
C
W x L
Size
Sq.
Opg.
Sq.
Size
W
B
D
10
11
11
14
TB
TD
18
20
24
30
36
42
48
54
60
72
281/4
301/4
341/4
401/4
461/4
521/4
581/4
641/4
701/4
821/2
13
16
18
20
22
24
24
261/2
261/2
29
23
27
29
34
401/4
441/4
461/4
511/4
563/4
593/4
603/4
661/4
671/4
701/4
271/4
281/4
281/4
311/4
343/4
353/4
363/4 93 x 111
393/4 112 x 111
403/4 124 x 123
411/4 136 x 135
48 x 51
54 x 51
66 x 63
75 x 75
88 x 87
86 x 99
18
20
24
30
36
42
48
54
60
72
201/2
221/2
261/2
321/2
381/2
441/2
501/2
561/2
621/2
741/2
C
D
B
TB
391/2 171/2
421/2 181/2
431/2 191/2
TD
Tall Base Option
A sq.
49
50
53
221/2
231/2
24
21/2"
Filtered Supply (Belt Drive Sizes Only 20 - 72)
L
Standard
Base
Tall
A
Damper Roof
Fan
Base
Base
Sq.
C
W x L
Size
Sq.
Opg.
Sq.
Size
B
D
11
11
14
TB
TD
20
24
30
36
42
48
54
60
72
301/4
341/4
401/4
461/4
521/4
581/4
641/4
701/4
821/2
16
18
20
22
24
27
29
34
441/4
461/4
511/4
563/4
593/4
603/4
661/4
671/4
701/4
281/4
281/4
311/4
343/4
353/4
363/4 112 x 111
393/4 124 x 123
403/4 136 x 135
411/4 136 x 147
54x 51
66 x 63
78 x 87
94 x 87
93 x 99
20
24
30
36
42
48
54
60
72
221/2
261/2
321/2
381/2
441/2
501/2
561/2
621/2
741/2
391/2 171/2
421/2 181/2
431/2 191/2
Tall Base Option
A sq.
24
261/2
261/2
29
49
50
53
221/2
231/2
24
Access to the motor compartment
On fan sizes 18 to 48:
- Remove two fasteners shown in fig. 1.
Carefully swing the hood 180 degrees and let it rest on
the roof. If desired, the entire hood may be removed
by removing the two additional fasteners on the
opposite side of the fan.
Use caution when handling the hood in strong winds.
On fan sizes 36 to 60 access to the motor compartment can
also be made by either:
- Removing birdscreen or filters and standing
under the hood of large fans.
Fig. 1
- Removing one interlocking hood end section of
smaller units
Fasteners
BEARINGS (For belt drive fans only)
Bearings are the most critical moving part of the fan and should be inspected at periodic intervals. Locking collars
and set screws, in addition to fasteners attaching the bearings to the bearing plate, must be checked for tightness. In a
clean environment and temperatures above 32°F./below 200° F., fan shaft bearings with grease fittings
should be lubricated semi-annually using a high quality lithium based grease. If unusual environmental conditions exist
temperatures below 32°F./above 200°F., moisture or contaminants, more frequent lubrication is required.
With the unit running, add grease very slowly with a manual grease gun until a slight bead of grease forms at
the seal. Be careful not to unseat the seal by over lubricating or using excessive pressure. Bearings without grease fittings are
lubricated for life.
FASTENERS AND SET SCREWS
Any fan vibration has a tendency to loosen mechanical fasteners. A periodic inspection should include checking all
fasteners and set screws for tightness. Particular attention should be paid to set screws attaching the propeller to the
shaft and the shaft to the bearings. Loose bearing set screws will lead to premature failure of the fan shaft.
LUBRICATION
Refer to the paragraph on bearings for bearing lubrication. Many fractional horsepower motors installed on the smaller fans are
lubricated for life and require no further attention. Motors equipped with oil holes should be oiled in accordance with the
manufacturer's instructions printed on the motor. Use a high grade SAE 20 machine oil and use caution not to over lubricate.
Motors supplied with grease fittings should be greased according to directions printed on the motor.
REMOVAL OF DUST AND DIRT
Dirt clogs cooling openings on the motor housing, contaminates bearing lubricant and collects on propeller blades
causing severe imbalance if left unchecked. The exterior surface of the motor, fan panel and entire propeller should be
thoroughly cleaned periodically. Use caution and do not allow water or solvents to enter the motor or bearings. Under no
circumstances should motors or bearings be sprayed with steam or water.
DAMPER INSPECTION AND SERVICE
If an optional tall base with damper is supplied, access to the optional dampers and actuators is provided by a removable door.
Simply release the two cam latches and slide the damper out for inspection, cleaning or service.
For fan sizes 24 through 36 supplied without a tall base, the entire unit must be lifted off the roof curb for access to the damper.
For fan sizes 42 through 72 suppled without a tall base, access to the damper is made by removing one end birdscreen or filter
FILTER MAINTENANCE (FILTERED SUPPLY FANS)
Aluminum mesh filters should be cleaned on a regular basis
for optimum fan efficiency. The frequency of cleaning
depends upon the cleanliness of the incoming air.
To remove filters on fan sizes 24 to 30, first remove the hood
as shown in fig.1. The filters can then be pulled from the
slide-out racks (shown in photo). On fan sizes 36 to 60,
access panels on the end panels are provided which allow
the filters to be removed without removing the hood.
Filters should be washed with a mild detergent in warm
water. After the filters are dry, an adhesive spray available at
most filter distributors may be applied to increase filter
efficiency.
Sliding filter out of filter rack.
TROUBLESHOOTING
PROBLEM
CAUSE
CORRECTIVE ACTION
System resistance is too high.
Check backdraft dampers for proper operation.
Remove obstructions in ductwork. Clean dirty
filters. Check for adequate supply air for
exhaust fans or exhaust air for supply fans.
Reduced airflow
Fan too close to damper.
Unit running backwards.
Fan speed too low.
Excessive dirt on propeller.
Bearings
Increase distance between fan and damper.
See pre-starting checks.
Increase fan speed.
Clean propeller.
Tighten bearing collars and set screws
Lubricate bearings. Replace defective bearings.
V-Belt drive
Tighten pulleys on motor and fan shaft. Adjust
belt tension. Align pulleys. Replace worn belts
or pulleys. See "Routine Maintenance".
Excessive Noise
Excessive vibration
Remove dirt build-up from propeller. Check all set
screws and fasteners for tightness. Check for
worn bearing. Correct propeller imbalance.
Check for loose dampers, guards or ductwork.
Defective Motor
Replace motor.
Motor load amperage must be checked and compared to nameplate rating to avoid serious damage to motor when speed is increased.
Belt Drive Fans Parts List
Direct Drive Fans Parts List
10
6
4
7
5
9
4
3
8
3
5
2
2
1
1
1. Fan Panel
2. Propeller
1. Fan Panel
2. Propeller
3. Drive Frame Channel (2)
4. Motor Plate
5. Motor
3. Drive Frame Channel (2)
4. Motor Plate
5. Motor
6. Motor Pulley
7. Shaft Pulley
8. Fan Shaft
9. Bearings (2)
10. Belt
11. Bearing Plate (Level 3 fans only - not shown)
IOM RB 10-95
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