SYSTEM OPERATION
10
The control will rotate available speed number every time
left/right switches are pressed. All 9 speeds are available
for circulation.
When the center switch is pressed, the current displayed
speed will be selected, and control will immediately apply
that speed setting.
THERMOSTAT
CALL
AVAILABLE
SPEEDS
G
F01
F02
F03
(DEFAULT)
F04
F05
F06
F07
F08
F09
Circulation Speed Table for 2 Stage IFC
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 ther-
mostat 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 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:
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:
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).
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.
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
CIRCULATING AIR AND FILTERS
DUCTWORK - AIR FLOW
Duct systems and register sizes must be properly designed
for the C.F.M. and external static pressure rating of the
furnace. Ductwork should be designed in accordance with
the recommended methods of “Air Conditioning Contractors
of America” manual D.
A duct system should be installed in accordance with
Standards of the National Board of Fire Underwriters for
the Installation of Air Conditioning, Warm Air Heating and
Ventilating Systems, Pamphlets No. 90A and 90B.
A return air filter is not supplied with the furnace. The installer
