Cooling Mode; Continuous Blower Mode - Bryant 393AAV Installation, Start-Up, And Operating Instructions Manual

115-VAC (L1)
Fig. 11—EAC Terminals on Furnace Control
NOTE: Ignition sequence will repeat 3 additional times before a
lockout occurs. Lockout automatically resets after 3 hr, or can be
manually reset by turning 115v off (not at thermostat) for 3 sec
minimum, then on again.
→
f. Blower on delay—Forty-five sec after burner flame is
proven, the blower motor is energized on heating speed.
Simultaneously, the electronic air cleaner terminals
(EAC-1 and EAC-2) are energized. If jumper is on pins
6 and 9 blower-on delay is 66-sec.
g. Blower off delay—When the thermostat is satisfied, the
circuit between R-W is broken, de-energizing the gas
valve stopping gas flow to the burners. The blower
motor and EAC remain energized 90, 135, 180, or 225
sec (depending on the blower off delay selection). The
furnace is factory set for a 135-sec blower off delay.
TEST/TWIN
SEC-1
3-AMP FUSE
COOL
HEAT
POWER
SUPPLY
HOT SURFACE
IGNITER
CONNECTOR
→Fig. 10—Furnace Control
EAC1
EAC2
BLOWER OFF DELAY
ADJUSTMENT SWITCH
24V THERMOSTAT
G
TERMINALS
R
Y
W
HUMIDIFIER TERMINAL
C
OM
(24-VAC 0.5 AMP MAX)
24V
HUM
LED OPERATION &
STATUS LIGHT
HARNESS CONNECTOR
24V TRANSFORMER SEC-2
SPARE 1
BLOWER SPEED
SELECTION TERMINALS
SPARE 2
EAC 1 (BLACK)
EAC-ELECTRONIC AIR CLEANER
TERMINALS (115-VAC 1.0 AMP MAX)
EAC 2 (WHITE)
115-VAC (L2) NEUTRAL
CONNECTION
INDUCER MOTOR
CONNECTOR
→
h. Post-purge—The inducer motor remains energized 5 sec
after the burners are extinguished. If jumper is on pins 6
and 9, post-purge period is 15-sec.

2. Cooling mode

When the thermostat "calls for cooling," R-G and R-Y
circuits close. The R-Y circuit starts the outdoor condensing
unit and the combined R-Y and R-G circuits start the
furnace blower motor on cooling speed. The EAC-1 termi-
nal is energized with 115v when the blower is operating on
cooling speed.
When the thermostat is satisfied, R-G and R-Y circuits are
broken. The furnace blower and EAC continue operating on
cooling speed for an additional 90 sec.

3. Continuous blower mode

A93053
NOTE: EAC-1 terminal is energized with 115v whenever blower
operates.
→
When the R-G circuit is made, the blower motor operates on
heating speed. During a call for heat, the blower stops,
allowing the furnace heat exchangers to heat up more
quickly, then restarts at the end of the 45-sec blower on
delay period. If jumper is on pins 6 and 9, the blower-on
delay is 66-sec.
The blower reverts to continuous operation after the heating
cycle is completed.
When the thermostat "calls for cooling," the blower oper-
ates on cooling speed. When the thermostat is satisfied, the
blower operates on cooling speed an additional 90 sec
before reverting back to continuous operation on heating
speed.
—10—
A99258