Bryant 311AAV Series 100 Installation, Start-Up, And Operating Instructions Manual page 16

FIVE WIRE
THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK BLK
WHT WHT
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
furnace blower motor BLWM will continue operating on
the COOL speed for an additional 90 seconds. Jumper
Y/Y2 to DHUM to reduce the cooling off-delay to 5
seconds. (See Fig. 17.)
b. Two-Speed Cooling- (See Fig. 30 for thermostat con-
nections)
The thermostat closes the R-to-G-and-Y1 circuits for
low-cooling or closes the R-to-G-and-Y1-and-Y2 cir-
cuits for high-cooling. The R-to-Y1 circuit starts the
outdoor unit on low-cooling speed, and the R-to-G-
and-Y1 circuit starts the furnace blower motor BLWM
on low-cool speed (same speed as FAN). The R-to-Y1-
and-Y2 circuits start the outdoor unit on high-cooling
speed, and the R-to-G-and-Y/Y2 circuits start the fur-
nace blower motor BLWM on COOL speed.
The electronic air cleaner terminal EAC-1 is energized
with 115 vac whenever the blower motor BLWM is
operating.
When the thermostat is satisfied, the R-to-G-and-Y1 or
R-to-G-and-Y1-and-Y2 circuits are opened. The outdoor
unit stops, and the furnace blower BLWM and electronic
air cleaner terminal EAC-1 will remain energized for an
additional 90 seconds. Jumper Y1 to DHUM to reduce
the cooling off-delay to 5 seconds. (See Fig. 22.)
3. Thermidistat Mode
(See Fig. 24, 25, 26, and 27 for Thermidistat connections)
The dehumidification output, DHUM on the Thermidistat
should be connected to the furnace control thermostat
terminal DHUM. When there is a dehumidify demand, the
DHUM input is activated, which means 24 vac signal is
removed from the DHUM input terminal. In other words,
the DHUM input logic is reversed. The DHUM input is
turned ON when no dehumidify demand exists. Once 24
vac is detected by the furnace control on the DHUM input,
the furnace control operates in Thermidistat mode. If the
DHUM input is off for more than 48 hours, the furnace
control reverts back to non-Thermidistat mode.
The cooling operation described in item 2. above also
applies to operation with a Thermidistat. The exceptions are
listed below:
NOTE 2
W C R
W
C
R
O
N
T
GND
R
G
O
L
COM
NOTE 1
Y/Y2
24-V
TERMINAL
BLOCK
NOTES:
FURNACE
Fig. 21–Heating and Cooling Application Wiring Diagram
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
THERMOSTAT
G Y
TERMINALS
CONDENSING
UNIT
TWO
WIRE
1. Connect Y-terminal in furnace as shown for proper blower operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
a. When the R-to-G-and-Y1 circuit is closed and there is a
demand for dehumidification, the furnace blower motor
BLWM will continue running at low-cool speed (same
speed as FAN).
b. When the R-to-G-and Y/Y2 circuit is closed and there is
a demand for dehumidification, the furnace blower
motor BLWM will drop the blower speed from COOL to
HEAT for a maximum of 10 minutes before reverting
back to COOL speed. If there is still a demand for
dehumidification after 20 minutes, the furnace control
CPU will drop the blower speed back to HEAT speed.
This alternating 10-minute cycle will continue as long as
there is a call for cooling.
c. When the "call for cooling" is satisfied and there is a
demand for dehumidification, the cooling blower-off
delay is decreased from 90 seconds to 5 seconds.
4. Continuous Blower Mode
When the R-to-G circuit is closed by the thermostat, the
blower motor BLWM will operate on continuous-blower
speed (can be set to FAN, HEAT, or COOL speed). Factory
default is FAN speed. Terminal EAC-1 is energized as long
as the blower motor BLWM is energized.
During a call for heat, the blower BLWM will stop during
igniter warm-up (17 seconds), ignition, and blower-ON
delay (25 seconds), allowing the furnace heat exchangers to
heat up more quickly, then restarts at the end of the
blower-ON delay period at HEAT speed. In heating, the
furnace control CPU will hold the blower motor BLWM at
HEAT speed during the selected blower-OFF delay period
before reverting to continuous-blower speed.
When the thermostat "calls for low-cooling", the blower
motor BLWM will switch to operate at low-cool speed
(same speed as FAN). When the thermostat is satisfied, the
blower motor BLWM will operate an additional 90 seconds
on low-cool speed (same speed as FAN) before reverting
back to continuous-blower speed.
When the thermostat "calls for high-cooling", the blower
motor BLWM will operate at COOL speed. When the
thermostat is satisfied, the blower motor BLWM will
—16—
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
A99440