Greenheck SQ Installation, Operation And Maintenance Manual page 5

Pre Start-Up Checks
Before Fan Installation
Before starting up or operating fan, check all fasteners
for tightness. In particular, check the cap screws in
wheel bushing.
Check all fasteners for tightness
1. The wheel should rotate freely and be aligned as
shown in Figure 1. Wheel position is preset and the
unit is tested at the factory. Movement may occur
during shipment, and realignment may be necessary.
2. Centering can be accomplished by loosening
the bolts holding the inlet cone (venturi) and
repositioning.
Wheel and inlet cone alignment overlap
1. Rotate the fan wheel by hand and assure no parts
are rubbing. The wheel should rotate freely and
be aligned as shown in Figure 1. Wheel position is
preset and the unit is tested at the factory.
2. Movement may occur during shipment, and
realignment may be necessary.
Radial Gap - If necessary, adjust inlet cone position
such that the radial gap between the wheel cone and
inlet cone is evenly distributed around the wheel.
Alignment - If necessary, adjust wheel position by
loosening the wheel hub from the fan shaft so that
a straight edge held tight to the wheel cone just
touches the inlet cone. Refer to Figure 1.
Wheel Cone
Gap
Inlet Cone
Figure 1
Recommended Fastener Torque
Torque in∙lb (ft∙lb)
Size Type
Self-Drilling Sheet
#12
Metal Screw
1/4 Hex Bolt
1/4 Cap Screw
1/4 Cap Screw
5/16 Semi-Gimlet Bolt
Serrated Flange
3/8
Bolt/Nut
Serrated Flange
1/2
Bolt/Nut
®
Straight Edge
Recommended
Application
Min. Max.
25 30
Outdoor Panels
(2) (2.5)
Ductwork and
96 108
Accessory
(8) (9)
Mounting
120 120 QT Bushing (Size
(10) (10) 7-24)
108 108 SD Bushing (Size
(9) (9) 27-33)
132 144
Fan Construction
(11) (12)
252 288
Motor Mount
(21) (24)
564 636
Motor Mount
(47) (53)
Operation
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 (page 8).
1. After the fan is installed, disconnect and lock-out all
power switches to fan.
2. Before connecting the fan to power, turn the fan
wheel by hand to be sure it is not striking the inlet
cone (venturi) or any obstacle.
3. Start the fan and shut it off immediately to check
rotation of the wheel, see Figure 2.
Wheel Rotation - Direction of wheel rotation is
critical. Reversed rotation will result in poor air
performance, motor overloading and possible
burnout. Rotation should be counterclockwise when
viewed from the fan inlet as shown in Figure 2. If
wheel rotation is incorrect, switch two of the wiring
leads for 3 phase power supply or check motor
wiring for single phase power supply. Fan rpm
should be checked and verified with a tachometer.
Figure 2
4. When the fan is started, observe the operation and
check for any unusual noises.
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.
6. Keep inlets and approaches to fan clean and free
from obstruction.
Inspection
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.
24 Hour Interval - Check all internal components.
Square Mixed Flow Inline Fans 5