Combustion-Air And Vent Piping - Bryant D Series Installation, Start-Up, And Operating Instructions Manual

7. If improper venting is observed during any of above tests,
the venting system must be corrected.
Vent system or vent connectors may need to be resized. For any
other appliances when resizing vent systems or vent connectors,
system or connector must be sized to approach minimum size as
determined using appropriate table found in the NFGC or NSC-
NGPIC.
II. COMBUSTION-AIR AND VENT PIPING
A. General
Combustion-air and vent pipe fittings must conform to American
National Standards Institute (ANSI) standards and American
Society for Testing and Materials (ASTM) standards D1785
(schedule-40 PVC), D2665 (PVC-DWV), D2241 (SDR-21 and
SDR-26 PVC), D2661 (ABS-DWV), F628 (schedule-40 ABS), or
F891 (PVC-DWV cellular core). Pipe cement and primer must
conform to ASTM standards D2564 or F493 (PVC or CPVC) or
D2235 (ABS). See Table 6 for maximum pipe lengths and Fig. 30,
31, 32, 33, and 34 for exterior piping arrangements.
In Canada construct all combustion-air and vent pipes for this unit
of CSA or ULC certified schedule-40 PVC, PVC-DWV or
ABS-DWV pipe and pipe cement. SDR pipe is NOT approved in
Canada.
NOTE: Furnace combustion-air and vent pipe connections are
sized for 2-in. pipe. Any pipe size change should be made outside
furnace casing in vertical pipe. (See Fig. 26.) This allows proper
drainage of vent condensate.
Combustion-air and vent pipes must terminate together in same
atmosphere pressure zone, either through roof or sidewall (roof
termination preferred), using accessory termination kit. See Table
5 for required clearances.
Furnace combustion-air and vent pipe connections must be at-
tached as shown in Fig. 27. Combustion-air intake plug fitting and
inducer housing alternate vent cap may need to be relocated in
some applications.
24-V THERMOSTAT
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX)
24-V TRANSFORMER SEC-2
LED OPERATION &
DIAGNOSTIC LIGHT
115-VAC (L2) NEUTRAL
BLOWER SPEED
SELECTION TERMINALS
TERMINALS
EAC-2
CONNECTION
COOL
HEAT
SPARE-1
SPARE-2
Fig. 25—Control Center
NOT IN
HORIZONTAL
SECTION
Fig. 26—Combustion-Air and Vent Pipe Diameter
Transition Location and Elbow Configuration
NOTE: Slope combustion-air and vent pipes a minimum of 1/4
in. per linear ft with no sags between hangers.
CAUTION: When combustion-air pipe is installed
above a suspended ceiling, pipe must be insulated with
3/8-in. thick Armaflex-type insulation. Combustion-air
pipe should also be insulated when it passes through
warm, humid space.
CAUTION: When vent pipe is exposed to temperatures
below freezing, such as when it passes through an
unheated space or when a chimney is used as a raceway,
pipe must be insulated as shown in Table 7 with
Armaflex-type insulation.
BLOWER OFF DELAY
JUMPER SELECT
J1
1
90
2
135
3
180
4
225
5
TEST/TWIN
HUM
3-AMP FUSE
SEC-1
PRI
115-VAC (L1)
FAN
POWER SUPPLY
EAC-1 ELECTRONIC AIR CLEANER
TERMINALS (115-VAC 1.0 AMP MAX)
—21—
FURNACE
PIPE DIAMETER
TRANSITION IN
VERTICAL SECTION
HARNESS CONNECTOR
HOT SURFACE
IGNITOR CONNECTOR
INDUCER MOTOR
CONNECTOR
A93034
A99417