58TN0B/58TN1B: 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.
15
Return Air Connections
A190346
Fig. 18 – Duct Flanges
Downflow Furnaces
The return-air duct must be connected to return-air opening bottom inlet,
see Fig. 19. DO NOT cut into casing sides (left or right). Side opening is
permitted for only upflow and certain horizontal furnaces. Bypass
humidifier connections should be made at ductwork or coil casing sides
exterior to furnace, see Fig. 19.
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 Fig. 20.
Bypass humidifier may be attached into unused return air side of the
furnace casing, see Fig. 20 and Fig. 21. Not all horizontal furnace
models are approved for side return air connections, see Fig. 21.
A02163
Fig. 19 – Downflow Return Air Configurations and Restrictions
A02075
Fig. 20 – Upflow Return Air Configurations and Restrictions
A02162
Fig. 21 – 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 in the U.S.
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 in. (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
A 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
DOWNFLOW RETURN AIR CONFIGURATIONS AND RESTRICTIONS
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Never purge a gas line into a combustion chamber. Never test for gas
leaks with an open flame. Use a commercially available soap solution
made specifically for the detection of leaks to check all connections. A
fire or explosion may result causing property damage, personal injury
or loss of life.
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