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830CA: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
12
A190346
Fig. 17 – Duct Flanges
RETURN AIR CONNECTIONS
Downflow Furnaces
The return-air duct must be connected to return-air opening (bottom inlet
as shown in
). DO NOT cut into casing sides (left or right). Side
opening is permitted for only upflow and most horizontal furnaces, see
. Bypass humidifier connections should be made at ductwork or
coil casing sides exterior to furnace.
Upflow and Horizontal Furnaces
The return-air duct must be connected to bottom, sides (left or right), or a
combination of bottom and side(s) of main furnace casing, see
and
. Bypass humidifier may be attached into unused return air
side of the furnace casing, see
A190365
Fig. 18 – Downflow Return Air Configurations and Restrictions
A190364
Fig. 19 – Upflow Return Air Configurations and Restrictions
A190366
Fig. 20 – Horizontal Return Air Configurations and Restrictions
GAS PIPING
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC.
Installations must be made in accordance with all authorities having
jurisdiction. If possible, the gas supply line should be a separate line
running directly from meter to furnace.
NOTE:
In the state of Massachusetts:
1. Gas supply connections
MUST
be performed by a licensed
plumber or gas fitter.
2. When flexible connectors are used, the maximum length shall not
exceed 36 inches (915 mm).
3. When lever handle type manual equipment shutoff valves are used,
they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT approved by the
state of Massachusetts.
WARNING
!
FIRE HAZARD
Failure to follow this warning could cause personal injury, death and/or
property damage.
Never connect return-air ducts to the back of the furnace. Follow
instructions below
UPFLOW/
HORIZONTAL
DOWNFLOW
SUPPLY
AIR
RETURN
AIR
RETURN
AIR
RETURN
AIR
NOTE: RESTRICTION SAME FOR
HORIZONTAL-LEFT
HORIZONTAL
RETURN AIR
RESTRICTIONS