18-CE12D1-1D-EN
111
7. The gas valve relay will open, closing the gas valve.
The inducer will continue to run for approximately 5
seconds to remove any combustion byproducts
from inside the furnace.
8. The indoor blower continues to run to remove heat
from the heat exchangers. This blower off time is
field adjustable through the IFC menu setup option.
The seven-segment LED will read
I
ID
DL
L
= Idle, no
thermostat demand.
S
Siin
ng
glle
e S
Stta
ag
ge
e C
Co
oo
olliin
ng
g
1. R-Y1-G contacts on the thermostat close sending
24VAC to the Y1 and G low voltage terminals on the
IFC. Technician should read 24VAC between Y1-B/C
and between G-B/C.
N
No
otte
e:: For S9X2 units, the factory supplied Y1-O jumper
must remain in place for proper seven-segment
LED readout. If removed, the seven-segment LED
will read
H
HP
P1
1
2. 24VAC is sent to the OD unit via thermostat wiring.
3. The indoor blower ramps to the cooling airflow.
The seven-segment LED, for example, will
alternately read:
CL1
= Cooling, Stage 1 (S9X2)
CP1
= Cooling, Stage 1 (S9X1 / S9B1)
tp7
= Speed Tap 7
4. When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y1-G will open.
5. The OD unit shuts off and the indoor blower shuts
off, unless a blower “Cool Off Delay” has been
enabled in the IFC setup menu options. The seven-
segment LED will read
IDL
= Idle, no thermostat
demand.
T
Tw
wo
o S
Stta
ag
ge
e C
Co
oo
olliin
ng
g
1. See sequence of operation for Single Stage Cooling
above (Steps 1–3).
2. R-Y2 contact on the thermostat closes sending
24VAC to the Y2 low voltage terminal on the IFC.
Technician should read 24VAC between Y2-B/C.
3. 24VAC is sent to the OD unit via thermostat wiring.
4. The indoor blower ramps to 2
nd
stage airflow. The
seven-segment LED for example will alternately
read:
CL2
= Cooling, Stage 2 (S9X2)
CP2
= Cooling, Stage 2 (S9X1)
tp7
= Speed Tap 7
5. When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y1–Y2–G will
open.
6. The OD unit shuts off and the indoor blower shuts
off, unless a blower“Cool Off Delay”has been
enabled in the IFC setup menu options. The seven
segment LED will read
IDL
= Idle, no thermostat
demand.
S
Siin
ng
glle
e S
Stta
ag
ge
e H
He
ea
att P
Pu
um
mp
p
1. R-Y1-G contacts on the thermostat close sending
24VAC to the Y1 and G low voltage terminals on the
IFC. Technician should read 24VAC between Y1-B/C
and between G-B/C.
N
No
otte
e:: For S9X2 units, the factory supplied Y1-O jumper
must be removed for proper seven-segment LED
readout. If left in place, the seven-segment LED
will read
C
CL
L1
1
2. 24VAC is sent to the OD unit via thermostat wiring.
3. The indoor blower ramps to the cooling airflow.
The seven-segment LED, for example, will
alternately read:
HP1
= Cooling, Stage 1 (S9X2)
CP1
= Cooling, Stage 1 (S9X1 / S9B1)
tp7
= Speed Tap 7
4. When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y1-G will open.
5. The OD unit shuts off and the indoor blower shuts
off, unless a blower “Cool Off Delay” has been
enabled in the IFC setup menu options. The seven-
segment LED will read
IDL
= Idle, no thermostat
demand.
T
Tw
wo
o S
Stta
ag
ge
e H
He
ea
att P
Pu
um
mp
p
1. See sequence of operation for Single Stage heat
pump above (Steps 1–3).
2. R-Y2 contact on the thermostat closes sending
24VAC to the Y2 low voltage terminal on the IFC.
Technician should read 24VAC between Y2-B/C.
3. 24VAC is sent to the OD unit via thermostat wiring.
4. The indoor blower ramps to 2
nd
stage airflow. The
seven-segment LED for example will alternately
read:
HP2
= Cooling, Stage 2 (S9X2)
CP2
= Cooling, Stage 2 (S9X1)
tp7
= Speed Tap 7
5. When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y1–Y2–G will
open.
6. The OD unit shuts off and the indoor blower shuts
off, unless a blower“Cool Off Delay”has been
enabled in the IFC setup menu options. The seven
segment LED will read
IDL
= Idle, no thermostat
demand.
