Continuous Blower Mode; Heat Pump Mode; Defrost; Start-Up Procedures - Bryant 330AAV Installation, Start-Up, And Operating Instructions Manual

(3.) When thermostat is satisfied, the R to G-and-Y1 or
R to G-and-Y1-and-Y/Y2 circuits open. The out-
door unit stops, and furnace blower continues op-
erating on cooling speed for an additional 90 sec.

4. Continuous Blower Mode

a. When R to G circuit is closed by thermostat, the blower
motor BLWM operates on low-gas heat speed (identical
to low-cool speed). Terminals EAC-1 and EAC-2 are
energized with 115v as long as blower motor BLWM is
energized.
b. During a "call for heat," the blower motor BLWM stops
during ignitor warm-up (17 sec), ignition (7 sec), and
blower on delay (45 sec), allowing furnace heat ex-
changers to heat up quickly.
c. The blower motor BLWM reverts to continuous blower
speed after the heating cycle is completed. In high-gas
heat, the furnace control CPU holds the blower motor
BLWM at high-gas-heat speed during the selected
blower off delay period before reverting to continuous
blower speed.
(1.) When thermostat "calls for low-cooling," the
blower motor BLWM continues to operate on
low-cool speed. When thermostat is satisfied, the
blower motor BLWM continues on continuous
blower speed.
(2.) When thermostat "calls for high-cooling," the
blower motor BLWM operates on high-cool speed.
When the thermostat is satisfied, the blower motor
BLWM operates an additional 2 sec on high-cool
speed before reverting back to continuous blower
speed.
(3.) When R-G circuit is opened, the blower motor
BLWM continues operating for an additional 90 sec
if no other function requires blower motor BLWM
operation.

5. Heat Pump Mode

NOTE: An accessory interface kit is required with single-speed
heat pumps. See interface kit Installation Instructions for single-
speed heat pump thermostat and interface connections. No inter-
face kit is needed for 2-speed heat pumps. See 2-speed heat pump
Installation Instructions for thermostat connections.
a. Single-Speed Heat Pump Cooling
(1.) The thermostat and interface kit close the R to
G-and-Y/Y2 circuit to start the furnace blower
motor BLWM on high-cooling speed. The Y/Y2
input to the furnace control is necessary to provide
adequate cooling airflow.
(2.) The EAC terminals EAC-1 and EAC-2 are ener-
gized with 115v when the blower motor BLWM is
operating.
(3.) When thermostat is satisfied, furnace blower motor
BLWM continues operating on high-cool speed for
an additional 90 sec.
b. Two-Speed Heat Pump Cooling
(1.) The thermostat R to G circuits start the furnace
blower motor BLWM on low-cool speed. The
thermostat R to G-and-Y/Y2 circuits start the fur-
nace blower motor BLWM on high-cool speed.
NOTE: The furnace control CPU controls blower motor BLWM
speed by sensing only G for low-cool speed and Y2 for high-cool
speed.
(2.) The EAC terminals EAC-1 and EAC-2 are ener-
gized with 115v when the blower motor BLWM is
operating on either cooling speed.
(3.) When thermostat is satisfied, the furnace blower
motor BLWM continues operating on cooling speed
for an additional 90 sec.
c. Single-Speed Heat Pump Heating
(1.) The thermostat and accessory interface kit R to G-
and-Y/Y2 circuits start the furnace blower motor
BLWM on heat pump high-heat speed (identical to
high-cool speed).
(2.) The EAC terminals EAC-1 and EAC-2 are ener-
gized with 115v when the blower motor BLWM is
operating.
(3.) When thermostat is satisfied, the furnace blower
motor BLWM continues operating on heat pump
high-heat speed for an additional 90 sec.
d. Two-Speed Heat Pump Heating
(1.) The thermostat closes R-G circuit for low heat and
starts furnace blower motor BLWM on heat pump
low-heat speed (identical to low-cooling speed).
Closing R-Y/Y2 circuit to furnace provides blower
motor BLWM heat pump high-heat speed.
NOTE: The furnace control CPU controls blower motor BLWM
speed by sensing only G (for heat pump low-heat speed) and Y2
(for heat pump high-heat speed).
(2.) The EAC terminals EAC-1 and EAC-2 are ener-
gized with 115v when the blower motor BLWM is
operating on either heating speed.
(3.) When thermostat is satisfied, the furnace blower
motor BLWM continues operating on heating speed
for an additional 90 sec.
(4.) Opening only R-Y/Y2 circuit reduces blower motor
BLWM speed to heat pump low-heat speed.

6. Defrost

a. When furnace control R to W/W1-and-Y/Y2 circuits are
closed, furnace control CPU continues blower motor
BLWM operation at heat pump heating speed until the
end of the prepurge period, then shuts off until the end of
the HSI ignitor-on period (22 sec).
b. When installed with a heat pump, the furnace control
CPU automatically holds blower off time to 22 sec
during HSI ignitor on period. After 17 sec of HSI
ignitor-on period, a trial for ignition sequence occurs as
described above for gas heating. After flame is proved
and without a blower on delay, the blower motor BLWM
will operate on high-gas-heat speed during defrost. For
both single-speed and 2-speed heat pumps, defrost mode
is in high-gas heat only.
c. When furnace control R-W/W1 circuit is opened, the
furnace control CPU begins the normal inducer post
purge period and the blower motor BLWM remains on
for the blower off delay period. If R-G circuit remains
closed, blower motor BLWM reverts to continuous
operation.
C. Start-up Procedures
1. Component test—The furnace features a component test
system to help diagnose a system problem in the case of a
component failure. To initiate the component test proce-
dure, ensure that there are no thermostat inputs to the
—14—