Greenheck SQ Installation, Operation And Maintenance Manual page 4

Pre Start-Up Checks
Before Fan Installation
1. Check all fasteners for tightness: The wheel
should rotate freely and be aligned as shown in
Figure 3. Wheel position is preset and the unit is
tested at the factory. Movement may occur during
shipment, and realignment may be necessary.
Centering can be accomplished by loosening
the bolts holding the inlet cone (venturi) and
repositioning.
2. Wheel and inlet cone overlap: Rotate the fan
wheel by hand and assure no parts are rubbing. The
wheel should rotate freely and be aligned as shown
in Figure 3. Wheel position is preset and the unit is
tested at the factory.
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 3.
Wheel Cone
Gap
Inlet Cone
Figure 3
4 Square Mixed Flow Inline Fans
Straight Edge
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 5).
1. After the fan is installed, disconnect and lock-out all
power switches to fan.
2. Before starting up or operating fan, check all
fasteners for tightness. In particular, check the cap
screws in wheel bushing.
3. 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.
4. Start the fan and shut it off immediately to check
rotation of the wheel, see Figure 4.
Wheel Rotation: Direction of wheel rotation is
critical. Reversed rotation will result in poor air
performance, motor overloading and possible
burnout. Check wheel rotation by momentarily
energizing the unit. Rotation should be
counterclockwise when viewed from the fan inlet
as shown in Figure 4. 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 4
5. When the fan is started, observe the operation and
check for any unusual noises.
6. 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.
7. 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.
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