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Exhaust Fans (Forward Curved Type)
The APEX-200 contains two forward curved exhaust fans located on
either side of the unit (see Basic Unit Operation). These forward curved
fans should be checked for free rotation. If any binding occurs, check
for concealed damage and foreign objects in the fan housing. Be sure
to check the belt drives per the start-up recommendations in the
following section.
Fan Performance Modifications
Due to job specification revisions, it may be necessary to
adjust or change the sheave or pulley to obtain the desired
airflow at the time of installation. Start-up technician must
check blower amperage to ensure that the amperage listed
on the motor nameplate is not exceeded. Amperage to be
tested with access doors closed and ductwork installed.
Supply Fan (Plenum Type)
The APEX-200 contains one plenum supply fan located on the end of the
unit opposite the outdoor air intake (see beginning of Unit Start-Up section
for diagram of unit layout). Efficient fan performance can be maintained by
having the correct radial gap and overlap. These items should be checked
before start-up and after the fan has been in operation for 24 hours.
Radial Gap: Radial gap is
adjusted by loosening the inlet
cone/ring on the wheel. If
additional adjustment is required
to maintain a constant radial gap,
loosening the bearing bolts and
centering the wheel is acceptable
as a secondary option.
Overlap: Proper overlap is
obtained by loosening the wheel
hub from the shaft and adjusting
the wheel to maintain an ‘A’
dimension of 11
7
⁄16 ±
3
⁄8 inches
(see FIGURE 16).
Spring Vibration Isolators on Supply Fan
Three to four Z-brackets prevent unwanted fan and isolator movement
during shipping. Proper unit operation requires the removal of these
brackets.
1. Remove the 5/16 in. hex head bolts from each Z-bracket and fan base.
2. Pull Z-bracket out from the fan base.
3. Replace the bolts to their original position in the fan base.
Radial
Gap
Overlap
A
SAFETY CAUTION!
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.),
consult Greenheck to determine if the unit can
operate safely at the new conditions.
Unit Start-Up
FIGURE 16: Radial gap
and overlap