Pre-Starting Checks - Greenheck DFD Series Installation, Operation And Maintenance Manual

Curb to Deck Mounting: Fasteners need to be located
on all four sides of the curb, Figures 12a and 12b.
Figure 12a
Roof Curb
3/8 in. (10 mm) S.S. Hilti Kwik Bolt 3
Expansion Anchors
Min. 2-1/2 in. (64mm) Engagement
3000 Min. PSI
Concrete
Concrete Anchoring
Figure 12b
Roof Curb
Wood Timber
Min. 4 in. (102 mm)
Nominal Thickness
Min. G=0.42
G = specific gravity
of lumber
Timber Anchoring
High Wind Ratings
Fan Curb Cap Size
inches (millimeters)
Size
≤ 17x17 to 22x22
(432x432 to 559x559 mm)
161
> 26x26 to 40x40
(660x660 to 1016x1016 mm)
161
≤ 17x17 to 22x22
(432x432 to 559x559 mm)
161
> 26x26 to 40x40
(660x660 to 1016x1016 mm)
161
≤
17x17 to 22x22
(432x432 to 559x559 mm)
161
> 26x26 to 40x40
(660x660 to 1016x1016 mm)
161
All dimensions are in inches (millimeters) .

Pre-Starting Checks

1. Check all fasteners and setscrews for tightness.
The wheel should rotate freely and be aligned as
shown in Figure 13.
Model Type
Model G - Overlap
inch (mm)
Size
Direct Belt
X – 060-095
X X 099-161 1/4 (6)
X X 180-300 1/2 (13)
– X 360-480 3/4 (19)
Figure 13
Wheel Overlap and Gap Dimension
®
Roof Curb
1/4 in. - 14 Self-Drilling Screw Min.
1/2 in. (13 mm) of Threads Through
Roof Truss
1/8 in. (3 mm)
Thick or 12 ga. Min.
Steel Anchoring
3/8 in. (10 mm) Lag Bolt (Zinc Plated)
Min. 3 in. (76 mm) Thread Engagement
Seismic Ratings
Fasteners Fasteners
Per Per
Total Fan Size
Side Side
3 12 060-240 2
4 16 300-360 3
420-480 5
3 12 060-240 2
3 12 300-360 3
420-480 5
3 12 060-240 2
4 16 300-360 3
420-480 5
H - Gap
inch (mm)
– 3/32 (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.
Centering the wheel can be accomplished by
loosening the bolts on the support pan and moving
support pan until wheel is properly aligned. For
units with drive frame mounting, loosen the bolts
holding the drive frame to the vibration isolators
and reposition the drive frame if additional
movement is needed for wheel alignment.
Wheel and inlet cone overlap can be adjusted
by loosening the setscrews in the wheel hub and
moving the wheel to the desired position. For
direct and belt drive models with wheel hubs and
shaft pulleys utilizing tapered bushing interface,
reference page 9 for tapered bushing removal and
move the wheel to the desired position.
3. Check wheel rotation (viewing from the shaft side)
by momentarily energizing the unit. Rotation should
be clockwise as shown in
Figure 14 and correspond to
the rotation decal on the unit.
If wheel rotation is incorrect,
Total
reverse two of the wiring leads
or check motor wiring for
8
single phase. Fan RPM should
12
be checked and verified with a
tachometer.
20
8
Correct direction of wheel rotation is critical. Reversed
12
rotation will result in poor air performance, motor
20
overloading and possible motor burnout.
8
12
La turbine doit impérativement tourner dans le bon
20
sens. Une rotation en sens inverse entraînerait de
mauvaises performances de soufflage, une surcharge
du moteur voire un grillage du moteur.
Belt Drive Pre-Starting Belt Tension Checks
4. Always loosen tension
enough to install belts
without stretching.
Do not force belt(s) see
Figure 15. Forcing belts
will break the cords and cause belt failure.
5. For units with two groove pulleys, adjust so the
tension is equal in both belts.
6. 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 16.
CORRECT
Figure 16
Figure 14
WARNING
AVERTISSEMENT
Figure 15
WRONG WRONG
Upblast Centrifugal Roof Exhaust
WRONG
7