15
Selecting Blower Speed
See
for blower speed as set by
blower leads. Since the blower leads connect to the control
box, blower speed selection is 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 factory set blower speed(s).
Changing Blower Speed
NOTE TO INSTALLER
When the unit is installed, the heating and cooling
speeds must be set for that particular installation.
The installer is responsible for setting these speeds.
The selected heating blower lead is attached to HEAT
on the control board. The selected cooling blower lead
is attached to COOL on the control board.
• For New Heating Speed: Remove heating blower
lead from HEAT on the control board. Choose desired
speed and install new blower lead on that terminal.
• For New Cooling Speed: Remove cooling blower lead
from COOL on the control board. Install new blower
lead on that terminal.
• Same Speed, Heating & A/C: Install white jumper
wire (supplied with unit) between HEAT & COOL of
the control board.
for blower performance
data.
4-TON BLOWEr WiTh COiL AND
COIL AND FILTERS, @ 0.3" ESP
PIN NO.
SPEED
CFM
#1
Low
880
#2
Med.-Low
1,170
#3
Med.-High
1,310
#4
High
1,460
5-TON BLOWEr, WiTh COiL AND
COIL FILTERS, @ 0.3" ESP
PIN NO.
SPEED
CFM
#1
Low
990
#2
Med.-Low
1,320
#3
Med.-High
1,620
#4
High
1,790
Table 4. Blower performance
Table 3. Furnace Blower Speed Data
PLUG / RECEPTACLE
POSITION
PIN
1
PIN
2
PIN
3
PIN
4
PIN
5
4 S
peed
B
lower
Low Med-LO Med-Hi
High
-
c
ontrol
B
ox
B
lower
l
ead
Red
Yellow
Blue
Black
-
Blower installation
1. Turn off all electrical supply circuits to the furnace at
the main service panel.
2. Remove furnace front door and switch furnace circuit
breaker(s) to OFF.
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
to remove.
5. Install new blower.
NOTE: Make sure the side flanges
engage under side mounting tabs. Three tabs on one
side and one on the other. The long tab is in the rear.
6. Replace screws removed from blower in step 4.
7. Connect the motor plug to the control panel receptacle.
8. Switch circuit breaker(s) to ON.
9. Reinstall furnace front door and turn on electrical supply
circuits to the furnace.
Installing Control Circuit Wiring
NOTE: Installation of a five-wire thermostat circuit
is recommended to for future addition of a heat/cool
thermostat. See
for various RE9X
thermostat connections.
1. Install the 24V control-circuit cable through plastic
bushing at either side of furnace.
2. Route control circuit wiring to wall thermostat and
outdoor section, if installed.
3. Set anticipator to the setting listed in the thermostat’s
installation instructions.
START-UP & ADJUSTMENTS
Pre-Start Check List
√
Verify the polarity of the connections are correct,
the line voltage power leads are securely connected
and the furnace is properly grounded. Refer to the
appropriate wiring diagram.
√
Verify the thermostat wires are securely connected
to the correct leads on the terminal strip of the circuit
board.
√
Check blower motor connectors for proper connection.
Start-up Procedures
1. Reinstall control box cover(s).
2. Switch circuit breaker(s) to the ON position.
3. Replace outer furnace door.
4. Check all duct connections and tape for air leakage.
