935CA: 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.
17
Representative drawing only, some models may vary.
A190216
Fig. 27 – Duct Flanges
Representative drawing only, some models may vary.
NOTE: Coil offset kits do not meet the 8-in. separation between the coil
pan and furnace if required, see
Table 6
. Additional metal shield or an
extension to achieve an 8-in. total separation is required.
Return Air Connections
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. Refer to
Table 11
footnotes for other return-air restrictions. Bypass humidifier
may be attached into unused return air side of the furnace casing, see
Fig. 28
and
Fig. 29
.
NOTE:
For Upflow Right Side Return, use upflow offset installation for
condensate trap. Refer to
Table 11
footnotes for other return-air
restrictions.
A200426
Fig. 28 – Upflow Return Air Configurations and Restrictions
A200425
Fig. 29 – Horizontal Return Air Configurations and Restrictions
NOTE:
Refer to
Table 11
footnotes for other return-air restrictions.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove and discard this panel when bottom return
air is used. To remove bottom closure panel, see
Fig. 34
.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. This panel MUST be in place when only side return
air is used. Where required by code, seal bottom closure to furnace with
tape, mastic or other durable sealing method.
NOTE:
For allowable side returns in horizontal configurations, see
Fig. 29
.
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
YES
NO
YES
NO
120
°
MIN
YES
120
°
MIN
YES
90
°
90
°
PERFORATED
DISCHARGE DUCT
FLANGE
NOT PERMITTED FOR
ANY MODEL