Venting - Bryant 312A Installation, Start-Up, Operating And Service And Maintenance Instructions

ACCESSORIES
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used)
using 1/4- -in female quick connect terminals to the two
male 1/4- -in quick- -connect terminals on the control board
marked EAC- -1 and EAC- -2. The terminals are rated for
115VAC, 1.0 amps maximum and are energized during
blower motor operation. (See Fig. 34.)
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp. maximum
humidifer (if used) to the 1/4- -in male quick- -connect
HUM terminal and COM- -24V screw terminal on the
control board thermostat strip. The HUM terminal is
energized when gas valve relay (GVR) is energized. (See
Fig. 34.)
NOTE: A field- -supplied, 115- -v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.
SETUP SWITCHES
LOW-HEAT ONLY AND
BLOWER OFF-DELAY
24-V-THERMOSTAT
TERMINALS
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX.)
3-AMP FUSE
LED OPERATION &
DIAGNOSTIC LIGHT
115-VAC (L2) NEUTRAL
CONNECTIONS
HI HEAT
LO HEAT
SPARE-1
BLOWER SPEED
SELECTION TERMINALS
TWINNING AND/OR
COMPONENT TEST
TERMINAL
LHT
OFF
DLY
TEST/TWIN
HUM
0.5-AMP024 VAC
FUSE 3-AMP
SEC-1 SEC-2
EAC-2 NEUTRAL-L2
BLW
BHI/LOR BHT/CLR
COOL 1-AMP@115 VAC
SPARE-1 SPARE-2 EAC-1
COOL
SPARE-2
VOLTAGE CONNECTION
EAC-1 TERMINAL
(115-VAC 1.0 AMP MAX.)
Fig. 34 - - Furnace Control- -PSC Blower Motor
NOTE: DO NOT connect furnace control HUM terminal to
HUM (humidifier) terminal on Thermidistat, Zone Controller or
similar device. See Thermidistatt, Zone Controller, thermostat,
or controller manufacturer's instructions for proper connection.

VENTING

The furnace shall be connected to a listed factory built chimney
or vent or a clay- -tile lined masonry or concrete chimney. Venting
into an unlined masonry chimney or concrete chimney is
prohibited. When an existing Category I furnace is removed or
replaced, the original venting system may no longer be sized to
properly vent the attached appliances. An improperly sized
Category I venting system could cause the formation of
condensate in the furnace and vent, leakage of condensate and
combustion products, and spillage of combustion products into
the living space.
ACRDJ - AIR CONDITIONING
RELAY DISABLE JUMPER
BLWR
PR-1
HSI HI LO
115-VAC (L1) LINE
26
TRANSFORMER 24-VAC
CONNECTIONS
PL1 - LOW VOLTAGE MAIN
HARNESS CONNECTOR
PL3
PL2 - HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
A02017