20
SYSTEM OPERATION
Cooling Mode Sequence of Operation
Low Stage Cooling Mode Sequence:
On a call for low stage cooling, the Y/Y1 or Y/Y1 and G
thermostat contacts close signaling the furnace control
board with 24 VAC on Y/Y1 or Y/Y1 and G terminals.
•
The 7-Segment will display the cool mode:
1 A C
•
The compressor and condenser fan are energized.
•
The circulator fan is energized at low cool speed after
a cool on delay. The electronic air cleaner will also be
energized.
•
After the thermostat is satisfied, the compressor is
de-energized and the Cool Mode Fan Off Delay period
begins.
•
Following the Cool Mode Fan Off Delay period, the
cool circulator and air cleaner relay are de-energized.
2nd Stage Cooling Mode Sequence:
On a call for 2nd stage cooling, the Y2 or Y2 and G
thermostat 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:
2 A C
•
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 satisfied, the compressor is de-
energized and the Cool Mode Fan Off Delay period
begins.
•
Following the Cool Mode Fan Off Delay period, the
cool circulator and air cleaner relay are de-energized
Cooling Mode Speed Selection
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 display 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
displayed speed will be selected, and control will
apply the newly selected speed in next cooling call.
THERMOSTAT
CALL
AVAILABLE
SPEEDS
Y/Y1
F01
F02
F03
F04
(DEFAULT)
F05
F06
F07
F08
F09
Single-Stage Cooling Speed Table for 2 Stage IFC
THERMOSTAT
CALL
AVAILABLE
SPEEDS
Y2
F01
F02
F03
F04
F05
(DEFAULT)
F06
F07
F08
F09
Two-Stage Cooling Speed Table for 2 Stage IFC
Furnace Shutdown
1. Set the thermostat to the lowest setting. The
integrated control will close the gas valve and
extinguish flame. Following a 15 second delay, the
induced draft blower will be de-energized. After
the blower off 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 shutoff valve external to the
furnace.
4. Replace the burner compartment door.
