F97CMN and G97CMN: 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
A10493
Fig. 19 – Duct Flanges
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. Bypass
humidifier may be attached into unused return air side of the furnace
casing, see Fig. 20, Fig. 21, Fig. 22.
A11036
Fig. 20 – Upflow Return Air Configurations and Restrictions
A11037
Fig. 21 – Downflow Return Air Configurations
and Restrictions
A11038
Fig. 22 – Horizontal Return Air Configurations
and Restrictions
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove this panel when bottom return air is used.
This panel may be used as the bottom closure of an accessory bottom
return air box, or discarded. To remove bottom closure panel, see
Fig. 23.
A170123
Fig. 23 – Removing Bottom Closure Panel (2 Screws)
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: Side return-air openings can be used in UPFLOW and some
HORIZONTAL configurations. Do not use side return-air openings in
DOWNFLOW configuration, see Fig. 20, Fig. 21, Fig. 22.
Downflow Installation
NOTE: The furnace must be pitched as shown in Fig. 18 for proper
condensate drainage.
Supply Air Connections
NOTE: For downflow applications, this furnace is approved for use on
combustible flooring when any one of the following 3 accessories are
used:
1. Determine application being installed from Table 4.
2. Construct hole in floor per Table 4 and Fig. 24.
3. Construct plenum to dimensions specified in Table 4 and Fig. 24.
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 DOWNFLOW HORIZONTAL
YES
NO
NO
YES
YES
YES
NO
120°
MIN
YES
120°
MIN
YES
120°
MIN
90°
90°
PERFORATED
DISCHARGE DUCT
FLANGE
ANY COMBINATION OF 1, 2, OR 3 PERMITTED.
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
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