40
-When the thermostat is satisfied;
•
The gas valve is de-energized.
•
The inducer remains energized for the post purge period
(15 seconds).
•
The indoor blower runs for the selected off delay period
(90 seconds by default, adjustable from 30 – 180 sec
-
onds).
Call for 2nd Stage Heat During 1st Stage Heat Operation
•
The control board receives a 24 vac signal on the W2
terminal.
•
The inducer motor is enabled at high speed.
•
Closure of the second stage pressure switch will energize
the high fire stage of the gas valve.
•
The 2nd stage gas heat speed of the indoor blower is
energized.
Note: A call for second stage without a call for first stage will
be ignored.
CoolinG mode SPeed SeleCtion
To change the main blower speed in COOLING mode, follow
the following steps:
1. Press left or right button till LED displays “AC1 “(for single
stage COOLING) or “AC2 “(for Two stage COOLING).
Press center button and LED will display the selected
speed number as Fxx (xx: Blower speed number from
1 to 9).
2. The control shall 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 shall be selected, and control shall 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
Cooling Mode
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 compres
-
sor 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-en
-
ergized 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.
Operational Checks
The burner flames should be inspected with the burner
compartment door installed. Flames should be stable, quiet,
soft, and blue (dust may cause orange tips but they must not
be yellow). Flames should extend directly outward from the
burners without curling, floating, or lifting off. Flames must
not impinge on the sides of the heat exchanger firing tubes.
