Tempstar F97CMN Installation, Start-Up, Operating And Service And Maintenance Instructions page 15

F97CMN and G97CMN: Installation, Start-up, Operating and Service and Maintenance Instructions
UPFLOW
PERFORATED
DISCHARGE DUCT
90°
FLANGE
120°
MIN
Fig. 19 – Duct Flanges
Return Air Connections
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.
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.
Fig. 20 – Upflow Return Air Configurations and Restrictions
Fig. 21 – Downflow Return Air Configurations
and Restrictions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
DOWNFLOW HORIZONTAL
90°
YES
YES
YES
YES
120° 120°
MIN MIN
NO NO
22.
ANY COMBINATION OF 1, 2, OR 3 PERMITTED.
YES
YES
NO
A10493
Fig. 22 – Horizontal Return Air Configurations
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.
Fig. 23 – Removing Bottom Closure Panel (2 Screws)
Side Return Air Inlet
A11036
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
Downflow Installation
NOTE: The furnace must be pitched as shown in
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
2. Construct hole in floor per
A11037
3. Construct plenum to dimensions specified in
15
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
and Restrictions
Fig. 20, Fig. 21, Fig. 22.
Fig. 18
Table 4.
Table 4 and Fig. 24.
Table 4
A11038
A170123
for proper
and Fig. 24.