GC9C80 Installation Manual
16
A new home may require more frequent replacement until all
construction dust and dirt is removed.
Upflow Models Minimum Recommended Filter Size
*0403A* 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return
*0603A* 1 - 16 X 25 Side or 14 X 24 Bottom Return
*0603B* 1 - 16 X 25 Side or Bottom Return
*0803B* 1 - 16 X 25 Side or Bottom Return
*0804B* 1 - 16 X 25 Side or Bottom Return
*0804C* 1 - 16 X 25 Side or Bottom Return
*0805C* 1 - 16 X 25 Side or Bottom Return¹
*0805D* 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return¹
*1004C* 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
*1005C* 2 - 16 X 25 Side or 1 - 20 X 25 Bottom Return
*1205D* 2 - 16 X 25 Side or 1 - 24 X 24 Bottom Return
Downflow Models
*0403A* 2 - 10 X 20 or 1 - 14 X 25 Top Return
*0603A* 2 - 10 X 20 or 1 - 14 X 25 Top Return
*0804B* 2 - 14 X 20 or 1 - 16 X 25 Top Return
*1005C* 2 - 14 X 20 or 1 - 20 X 25 Top Return
Larger filters may be used, filters may also be centrally located
¹ = Use 2 - 16 X 25 filters and two side returns or 20 X 25 filter on bottom
return if furnace is connected to a cooling unit over 4 tons nominal capacity
A combination of one side & bottom may be used instead of both sides
Wiring routing must not interfere with circu-
Low voltage connections can be made through either the
right or left side panel. Thermostat wiring entrance holes
shows connections for a “heat/cool system”.
-
-
agram, located on the blower compartment door, for further
Y
C
Y
C
G
R
W
Y2
Y/Y1
C
G
R
W/W1
W2
ROOM THERMOSTAT
INTEGRATED FURNACE
CONTROL MODULE
REMOTE COOLING UNIT
(SINGLE STAGE)
Thermostat - Single -Stage Heating with Single-Stage Cooling
Thermostat - Single -Stage Heating with Single-Stage Cooling
To apply a single-stage Heating Thermostat, the staging option
must be set on single-stage.
Y
C
Y
C
G
R
W/W1
Y2
Y/Y1
C
G
R
W/W1
W2
ROOM THERMOSTAT
INTEGRATED FURNACE
CONTROL MODULE
REMOTE COOLING UNIT
(SINGLE STAGE)
W2
Thermostat - Two-Stage Heating with Single-Stage Cooling
Y1
C
Y1
C
G
R
W1
Y2
Y/Y1
C
G
R
W/W1
W2
ROOM THERMOSTAT
INTEGRATED FURNACE
CONTROL MODULE
REMOTE COOLING UNIT
(TWO STAGE)
W2
Y2
Y2
Thermostat - Two-Stage Heating with Two-Stage Cooling
A single-stage heating thermostat may be used to control
this furnace; however, the furnace is setup by default to use
a two-stage heating thermostat. To use a single stage heat-
ing thermostat the installer must make the desired selec-
tions in the user menus using the push button switches on
the control board. When a single stage heating thermostat is
used there are two options for controlling the timed transition
• Press the Left or Right menu switches to get to the
•AHS menu.
• The menu will display these options: no10203060AUt
•
display as: 10203060
• If AUt (Automatic) is selected, the actual timing for the
transition to 2nd stage heat will be calculated by the
control board based on length of run time of previous
heating cycles (duty cycle).
• Press the center switch to save the selection.
In Auto mode, the transition to 2nd stage heat will vary be-
tween 1 to 12 minutes.
Duty Cycle %
Heating Stage Timing
Demand
0-38
1
st
Stage, 12 minute 2
nd
Stage
Light
39-50
1
st
Stage, 10 minute 2
nd
Stage
Light to Average
51-62
1
st
Stage, 7 minute 2
nd
Stage
Average
63-75
1
st
Stage, 5 minute 2
nd
Stage
Average to Heavy
76-88
1
st
Stage, 3 minute 2
nd
Stage
Heavy
89-100
1
st
Stage, 1 minute 2
nd
Stage
Heavy