COMBUSTION-AIR AND VENT PIPING
General
Combustion-air and vent pipe, fittings, primers, and solvents must
conform to American National Standards Institute (ANSI) stan-
dards and American Society for Testing and Materials (ASTM)
standards. See Table 5 for approved materials for use in the U.S.A.
See Table 7 for maximum pipe lengths and Fig. 37, 38, 39, 40, and
41 for exterior piping arrangements.
In Canada, construct all combustion-air and vent pipes for this unit
of CSA or ULC listed 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. 33.) This allows proper
drainage of vent condensate.
Combustion-air and vent pipes must terminate together in same
atmospheric pressure zone, either through roof or sidewall (roof
termination preferred), using accessory termination kit.
See Table 6 for required clearances.
Furnace combustion-air and vent pipe connections must be at-
tached as shown in Fig. 34. Combustion-air intake plug fitting and
inducer housing alternate vent cap may need to be relocated in
some applications.
NOTE: Slope combustion-air and vent pipes a minimum of 1/4
in. per linear ft with no sags between hangers.
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 a warm, humid space.
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 8 with Armaflex-type insulation. Failure to
follow this caution will result in minor unit operation.
Fig. 32—Control Center
A02278
FLASH
UPGRADE
CONNECTOR
(FACTORY
ONLY)
ACRDJ – AIR
CONDITIONING
RELAY DISABLE
JUMPER
HUMIDIFIER
TERMINAL (24-VAC
0.5 AMP MAX.
CONTINUOUS FAN
(CF) AIRFLOW
SETUP SWITCHES
COMMUNICATION
CONNECTOR
AIR CONDITIONING
(A/C) AIRFLOW
SETUP SWITCHES
MODEL PLUG
CONNECTOR
SW1 SETUP
SWITCHES AND
BLOWER OFF-
DELAY
STATUS AND COMM
LED LIGHTS
3-AMP FUSE
TRANSFORMER 24-VAC
CONNECTIONS
PL3 – ECM BLOWER
HARNESS
CONNECTOR
PL1 – LOW VOLTAGE MAIN
HARNESS CONNECTOR
EAC-1 TERMINAL
115-VAC 1.0 AMP MAX.
115-VAC (L1) LINE
VOLTAGE CONNECTIONS
115-VAC (L2) NEUTRAL
CONNECTIONS
PL2 – HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
24-V THERMOSTAT
TERMINALS
FUTURE
APPLICATIONS
24
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