19
3.
Disconnect the motor plug from the control
panel receptacle.
4.
Remove one screw from left side of blower
and three screws from right side of blower;
slide blower forward and remove.
5.
Install new blower ensuring the side flanges
engage under side mounting tabs (three on
one side, one on the other) and the long tab
in the rear.
6.
Replace screws previously removed from
blower.
7.
Connect the motor plug to the control panel
receptacle.
8.
Switch circuit breaker(s) to “ON”, reinstall
furnace front door, and turn on electrical
supply circuits to the furnace.
Selecting Blower Speed
See Table 5 for the lowest speed approved for
the heating output of the unit. Since the blower
leads connect to the control box, blower speed
selection is accomplished through use of the
proper color-coded blower lead located inside
the control box. The speed(s) set by the factory
may be different from that shown on the wiring
diagrams. See the unit control box for blower
speed(s) set at factory.
!
IMPORTANT:
If a relay box is installed, blower speeds
for heating and cooling are set inside
the relay box (see instructions
included with relay box). The blower
speed inside the furnace control box
must be set to low or medium-low.
Never change to a heating speed lower
than that shown in Table 5.
Table 5. Furnace Blower Speed Data
Changing Blower Speed
E2EH: The selected heating blower lead is
attached to the wire lead attached to terminal 2
of the blower selector switch.
a.
Remove blower lead from the wire lead off
of terminal 2.
b.
Choose desired speed.
c.
Attach new blower lead to wire lead off
terminal 2 of blower selector switch.
E2EB: The selected heating blower lead is
attached to the heating blower relay. The
selected cooling blower lead is attached to the
cooling blower relay.
a.
Remove heating blower lead from heating
blower relay.
b.
Choose desired speed and install new
blower lead onto blower relay for new
heating speed.
c.
Remove cooling blower lead from cooling
blower relay.
d.
Install new blower lead onto blower relay for
new cooling speed.
See Table 7 for blower performance data.
One Speed for both Heating and
Cooling
If you would like to have the same blower speed
for both heating and cooling do the following:
a.
Remove the cooling blower lead from the
cooling relay and remove the heating blower
lead from the amp terminal on the heating
relay.
b.
Attach the white jumper wire (found in the
wire tie) to the cooling relay and the amp
terminal on the heating relay.
c.
Choose desired speed and attach that
blower lead to the amp terminal on the
heating relay.
Plug/Receptacle Position
Pin1
Pin2
Pin3
Pin4
2 Speed Blower
Low
High
-
-
3 Speed Blower (Alternate)
-
Low
Med
High
4 Speed Blower
Low
Med-Lo
Med-Hi
High
Control Box Blower Lead
Red
Yellow
Blue
Black
Minimum approved
speed for all models.
