Only qualified service personnel shall perform installation and service.
4
B. Install the Upgrade Blower / Motor Assembly
! CAUTION: On horizontal / counterflow models, if the auxiliary high limit
thermostat was removed from the furnace (in Step A5, above), reuse the
original fasteners to reattach the thermostat to the blower support panel in
the original mounting position AFTER installing the upgrade blower.
1. Move the upgrade blower / motor assembly into position within the furnace
blower compartment. Orient the blower / motor assembly such that the
terminal blocks are positioned on the surface of the blower scroll toward the
installer.
•
On highboy models,
engage the blower support angles in the slots
formed by the blower rails on the underside of the blower support panel.
Slide the blower / motor assembly completely rearward into the furnace.
!
On lowboy models,
set the blower down in the furnace and push the
blower through the rear separator panel until about one (1) inch of the
snout of the scroll protrudes through the rear separator panel of the
furnace.
o
On horizontal / counterflow models,
set the blower down in the furnace
and center it over the blower support panel opening.
2. Reinstall the fasteners fixing the blower mounting angles or legs in place.
•
On highboy models,
align the holes in the support angles with the holes
in the blower support panel. Drive two (2) sheet metal screws downward
through the blower support panel holes and into the holes in the support
angles to secure the blower assembly. Reinstall the burner access panel.
!
On lowboy models,
center the blower from side to side within the
opening of the rear separator panel. To secure the blower / motor
assembly, capture a flat washer under the head of each screw. Trap the
ring terminal of the blower motor ground lead between the left-hand (LH)
side blower leg and the base panel. Drive a sheet metal screw downward
through the center of the rubber grommet in each leg (located about three
(3) inches back from the rear of the furnace) and into the base panel. The
LH side screw should pass through the ring terminal.
o
On horizontal / counterflow models,
using the holes in the blower
support angles as guides, drive four (4) sheet metal screws [two (2) on
either side of the bower scroll] downward through the support angles and
into the blower support panel to secure the blower assembly.
