12
On a call for 2nd stage cooling, the Y2 or Y2 and G thermo-
stat contacts close signaling the furnace control board with
24 VAC on Y2 or Y2 and G terminals.
• The 7-Segment will display the cool mode:
• The compressor and condenser fan are energized.
• The circulator fan is energized at cool speed after a
cool on delay. The electronic air cleaner will also be
energized.
• After the thermostat is satised, the compressor
is de-energized and the Cool Mode Fan O Delay
period begins.
• Following the Cool Mode Fan O Delay period, the
cool circulator and air cleaner relay are de-energized
To change the main blower speed in COOLING mode, follow
the following steps:
1. Press the left or right switch until LED displays “AC1
“(for single stage COOLING) or “AC2 “(for two-stage
COOLING). Press the center switch and LED will dis-
play the selected speed number as Fxx (xx: Blower
speed number from 1 to 9).
2. The control will rotate available speed number every
time left/right switches are pressed. All 9 speeds are
available for both Single and Two Stage cooling.
3. When the center switch is pressed, the current dis-
played speed will be selected, and control will apply
the newly selected speed in next cooling call.
THERMOSTATCALL AVAILABLESPEEDS
Y/Y1
F01
F02
F03
F04(DEFAULT)
F05
F06
F07
F08
F09
THERMOSTATCALL AVAILABLESPEEDS
Y2
F01
F02
F03
F04
F05(DEFAULT)
F06
F07
F08
1. Set the thermostat to the lowest setting. The inte-
grated control will close the gas valve and extinguish
ame. Following a 15 second delay, the induced draft
blower will be de-energized. After the blower o delay
time expires, the blower de-energizes.
2. Remove the burner compartment door and move the
furnace gas valve manual control to the OFF position.
3. Close the manual gas shuto valve external to the
furnace.
4. Replace the burner compartment door.
Filters must be used and well maintained. There are no pro-
visions to install lters inside the furnace cabinet. Refer to
the chart below for minimum lter sizes. A deep pleated lter
or electronic air lter may also be used.
DM80SN furnaces require installer provision of a return air
lter located on the side or bottom of the furnace or a cen-
trally located lter.
DC80SN furnaces require installer provision of a lter rack
located in the return air plenum or a centrally located lter
Upflow / Horizontal
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 1 - 14 X 24 Bottom Return
*0604B* 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
*0805C*
1 - 16 X 25 Side or Bottom Return¹
*0805D* 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
*1405D* 2 - 16 X 25 Side or 1 - 24 X 24 Bottom Return
Downflow Models Minimum Recommended Filter Size^
*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
¹ = us e 2 - 16 X 25 fi l ters 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
^ Filters may also be centrally located
The external lter rack kit is intended to provide a location
external to the furnace casing, for installation of a perma-
nent lter on upow model furnaces. The rack is designed
to mount over the indoor blower compartment area of either
side panel, and provide lter retention as well as a location
for attaching return air ductwork.
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