Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/14
20
3-90-08121i
B. Blower Assembly
Install the blower mounting brackets on the blower as shown
in Figure 5.8.
1. Install (4) Tek screws on each side where shown in Figure
5.8. Start with the two center screws.
NOTE:
There are two small holes in the discharge end of the
blower that match the two center holes on the small angle
of the blower bracket. The two (2) outer holes are drilled by
the Tek screws.
2. Mount blower with brackets installed on the furnace as
shown in Figure 5.9. Each side will require 6 Tek screws.
Mounting Screws
NOTE: These Blower Motors are not designed to be
operated without any positive static back pressure.
OPERATION wITHOUT SUPPLY DUCT wORK OR IN
FREE AIR wILL CAUSE MOTOR OVERLOAD AND
PREMATURE FAILURE.
3. Mount the filter box on the furnace with (6) #10 x 3/4 Tek
screws, 3 on each side Figure 5.10. Visually locate these
holes so you are familiar with their location on the filter
box and the furnace. Access to the mounting holes can
be gained through the blower access panel cover and the
filter opening. Figure 5.11.
Note:
Two pieces of 2x4 stacked laying flat on the floor 12
inches from the blower opening will support the filter box
during installation
Figure 5.8
Figure 5.9
Figure 5.10
Figure 5.11
Regardless of the supply air duct size installed, the
Distribution Blower Motor
MUST
be checked for running
Amperage. Check the motor name plate for the full
load AMPS. If the amperage is running higher than that
listed, a supply air restricting damper may be required
to increase the supply plenum positive static pressure.
CAUTION
!
