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Return Air Connections
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
Downflow Furnaces
The return- -air duct must be connected to return- -air opening
(bottom inlet) as shown in Fig. 20. DO NOT cut into casing sides
(left or right). Side opening is permitted for only upflow and most
horizontal furnaces. (See Fig. 20) 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 as shown in Fig. 19 and 21. Bypass humidifier may be
attached into unused return air side of the furnace casing. (See
Fig. 19 and 21)
GAS PIPING
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.
441 01 1501 04
Fig. 17 - - Typical Attic Installation
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury,death, and/or property damage.
Use proper length of pipe to avoid stress on gas control
assembly and a gas leak.
FURNACE OVERHEAT HAZARD
Failure to follow this caution may result in property
damage.
Connect gas pipe to gas valve using a backup wrench to
avoid damaging gas controls and burner misalignment.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use a
connector which has previously served another gas
appliance. Black iron pipe shall be installed at the furnace
gas control valve and extend a minimum of 2 in.(51 mm)
outside the furnace.
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).
Specifications are subject to change without notice.
WARNING
!
CAUTION
!
WARNING
!
A180240
13
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