Reznor R6GN Option - Installation - High Static Blower Drive - Light Commercial - Manual (Page 8)

8
Grounding
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not use
gas piping as an electrical ground!
This unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical
Code.
V-Belt Alignment & Tensioning
IMPORTANT NOTE: Belt alignment is extremely critical for
proper operation and life expectancy of belts and motor
bearings. If not equipped with proper alignment tools,
prior to removal of blower and motor pulley, measure
center of each pulley to a reference point for replacement
of new pulleys.
After installing the blower pulley onto the blower shaft, use
an in-groove belt alignment tool to verify the parallel offset of
the sheave and pulley. If a laser alignment tool is unavailable,
place a straight edge, piano wire, or string in the center of
the adjustable sheave and pulley V-notch to adjust parallel
offset alignments.
NOTE: The straight edge, piano wire or string should be close
to the center of the groove and contact each sheave in two
places. The objective is to have the center lines of the two
sheaves in line. Belt drives should be aligned as perfect as
possible to maximize drive life. See Figure 6.
Calculate or measure the belt span length as shown in Figures
7 & 8. Calculate the required defl ection by multiplying this
number by 1/64. For example, if the belt span is 32 inches,
32 x 1/64 = 1/2 inch defl ection. NOTE: Excessively high or
low tensions will affect belt life. Check belt tensions again
after 24 hours of operation. Keep extra belts stored in a cool,
dark, dry place.
Center Distance
Figure 7. Pulley Alignment
Span Length, t
Deflection (def)
Force
Figure 8. Tensioning V-Belts
Figure 6. V-Belt Alignment
On 12.5-15T Models: The belt tension is controlled utilizing the
adjustable motor mounting plate. To release the belt tension,
fi rst loosen the 4 motor mounting nuts that attach the motor to
the mounting plate approximately ½-1 turn and then use the
adjusting bolt to release the belt tension. To tighten, complete
the steps in the reverse order.
On 6-10T Packaged Models: The belt tension is controlled
utilizing the belt-tensioning bars on the top and bottom of the
motor mounting plate. To release the belts tension, fi rst loosen
the bolts in the adjustable slot of each tensioning bar fi rst,
followed by the second bolt in each tensioning bar. Swing the
motor & motor plate assembly towards the blower. To tighten,
use a pry-bar to apply pressure to the top of the motor plate
and tighten the top belt tensioning bar. Verify the motor is
plumb and that the shaft is vertically aligned by adjusting the
bottom of the motor plate, then tighten the bottom tensioning
bar bolts. When complete, always verify the belt tension and
alignment, do not over-tighten.
VERIFYING THE INSTALLATION
Line Voltage
Maximum circuit ampacity and maximum overcurrent protection
ratings may vary. See the unit rating plate for proper electrical
ratings. NOTE: Older equipment may not include a rating plate
that shows the HSDK maximum overcurrent protection and
other electrical data for the kit. Always verify this information
with the installation instructions included with the unit. If these
are not available then refer to Table 3 (page 4).
• Verify that the power supply for the unit is in accordance with
the units wiring diagram and rating plate. Use only copper
wire for the line voltage supply to this unit. Use proper code
agency listed conduit and connector for connecting the
supply wires.
• Verify all electrical connections are in accordance with all
applicable codes and ordinances. Any other wiring methods
must be acceptable to authority having jurisdiction. See
Figure 9 (page 10) for recommended wire size.
• Verify overcurrent protection is provided at the branch circuit
distribution panel and sized as shown on the unit rating label
and according to the National Electric Code and applicable
local codes.