Greenheck LD/LDP/LB/LBP (453283) - Manual (Page 4)

Centrifugal Roof Exhaust Fans 4
®
Removing From Storage
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.
Pre-Startup Checks
1. Check all fasteners for tightness. The wheel should
rotate freely and be aligned as shown in Figure 1.
2. Wheel position is preset and the unit is test run at
the factory. Movement may occur during shipment,
and realignment may be necessary.
3. Centering can be accomplished by loosening the
bolts holding the drive frame to the shock mounts
and repositioning the drive frame.
4. Wheel and inlet cone overlap can be adjusted by
loosening the setscrews in the wheel and moving
the wheel to the desired position.
5. Check wheel rotation by momentarily energizing
the unit. Rotation should be clockwise as shown in
Figure 2 and correspond to the rotation decal on
the unit. Rotation is determined when the unit is
viewed from the motor or shaft pulley side.
Pre-Starting Belt Tension Checks
6. Always loosen tension enough to install belt without
stretching, see Figure 3.
7. 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 4.
8. Belt tension can be adjusted by loosening four
fasteners (marked “R” in Figure 5) on the drive
frame. This allows the motor plate to slide on the
drive frame angles for proper positioning.
9. Belt tension should be adjusted to allow 1⁄64 in.
(0.397 mm) of deflection per inch of belt span. For
example, a 15 in. (381 mm) belt span should have
15⁄64 in. (0.234 mm) (or about 1⁄4 in. (6 mm)) of
deflection with moderate thumb pressure at mid-
point between pulleys, see Figure 6.
Clockwise
WHEEL ROTATION
All Series L fans have
clockwise (CW) wheel
rotation when viewed
from top of fan.
Figure 2
WARNING
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible motor burnout.
AVERTISSEMENT
La turbine doit impérativement tourner dans le bon
sens. Une rotation en sens inverse entraînerait de
mauvaises performances de soufflage, une surcharge
du moteur voire un grillage du moteur.
Do not force belt(s). Forcing the
belt(s) will break the cords and
cause belt failure
BELTS
Figure 3
IMPORTANT
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.
IMPORTANT
Over tightening will cause excessive bearing wear and
noise. Too little tension will cause slippage at startup
and uneven wear.
Figure 4
FASTENERS
Identical fasteners
on opposing side
must also be
loosened.
Figure 5
G H
WHEEL OVERLAP AND GAP DIMENSIONS
Model G - Overlap in. (mm) H - Gap in. (mm)
LD/LDP 60-095 – 3/32 (2)
LD/LDP 100-120 – 1/4 (6)
LB/LBP 10-14 1/4 (6) –
LB/LBP 18-24 3/8 (10) –
LB/LBP 30-54 1/2 (13) –
Figure 1
R