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1. Remove main furnace door and blower access panel.
2. Locate CF setup switches on control center. (See Fig. 25.)
3. Determine desired continuous fan airflow.
4. Use Table 9 or wiring schematic to determine proper setup
position of CF switches. (See Fig. 24 and 45.)
NOTE: The CF switches are factory set to provide continuous fan
airflow equal to low-heat mode.
5. Replace main furnace door and blower access panel.
C. Setup Switches (SW)
The control center has 8 setup switches that may be set to meet the
application requirements. Position these setup switches for the
appropriate requirement.
1. Remove main furnace door and blower access panel.
2. Locate setup switches on control center. (See Fig. 25.)
3. See Table 10 for setup switch description. (See Fig. 24 and
45.)
4. Replace main furnace door and blower access panel.
NOTE: If a bypass humidifier is used, setup switch SW-3 (BPH)
should be in ON position. This prevents nuisance limit trips caused
by the increased temperature in return air resulting from bypass.
NOTE: If modulating dampers are used, setup switch SW-5 (MZ)
should be in ON position. This allows furnace control center to
compensate for modulating dampers. The control re-calibrates for
new system static conditions once every minute while operating in
low-heat or continuous fan modes.
III. PRIME CONDENSATE TRAP WITH WATER
CAUTION: Condensate trap must be PRIMED or
proper draining may not occur. The condensate trap has 2
internal chambers which can ONLY be primed by pour-
ing water into the inducer drain side of condensate trap.
1. Remove upper inducer housing drain connection cap. (See
Fig. 46.)
2. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.
3. Insert field-supplied funnel into tube.
4. Pour 1 quart of water into funnel/tube. Water should run
through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 47.)
5. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.
TABLE 8—AIR CONDITIONING (A/C) AIRFLOW SETUP SWITCH POSITION
AIR
CONDITIONER
(TONS)
CFM AIRFLOW
A/C SETUP
SWITCH POSITION
ALLOWABLE FURNACE MODEL SETUP
A/C-1 A/C-2 A/C-3 042040 042060 042080 060080 060100 060120
Default
1200 or
2000
OFF OFF OFF
3 Tons
1200 CFM
3 Tons
1200 CFM
3 Tons
1200 CFM
5 Tons
2000 CFM
5 Tons
2000 CFM
5 Tons
2000 CFM
1-1/2 600 ON OFF OFF X X X — — —
2 800OFFONOFFXXXXXX
2-1/2 1000 ON ON OFF XXXXXX
3 1200 OFF OFF ON XXXXXX
3-1/2 1400 ON OFF ON XXXXXX
4 1600 OFF ON ON — — — X X X
5 2000 ON ON ON — — — X X X
X—Indicates allowable selection.
TABLE 9—CONTINUOUS FAN (CF) AIRFLOW SETUP SWITCH POSITION
CONTINUOUS
FAN (CFM)
CF SETUP
SWITCH POSITION
ALLOWABLE FURNACE MODEL SETUP
CF-1 CF-2 CF-3 042040 042060 042080 060080 060100 060120
Default OFF OFF OFF 565* 515* 690* 690* 860* 1035*
600 ON OFF OFF X X X — — —
800 OFFONOFFXXXXXX
1000 ONONOFFXXXXXX
1200 OFFOFFONXXXXXX
1400 ONOFFONXXXXXX
1600 OFF ON ON — — — X X X
2000 ON ON ON — — — X X X
* Add 15% additional CFM when Bypass Humidifier switch SW-3 on control board is used.
X—Indicates allowable selection.
Fig. 45—Example of Setup Switch in OFF Position
A95198
1
OFF
—35—