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912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
Fig. 21 – Upflow Return Air Configurations and Restrictions
Fig. 22 – Downflow Return Air Configurations
and Restrictions
HORIZONTAL
RETURN NOT
PERMITTED FOR
ANY MODEL
Fig. 23 – Horizontal Return Air Configurations
and Restrictions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
ANY COMBINATION OF 1, 2, OR 3 PERMITTED.
A11036
A11037
APPLIES TO ALL MODEL SIZES
A13109
SCREWS (2)
Representative drawing. Models may vary.
1.
Lay furnace on the back or side
2.
Remove the two (2) screws that secure the bottom
closure panel to the furnace casing and remove the
panel
Fig. 24 – 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.
Side return-air openings can only be used in UPFLOW
configurations. Do not use side return-air openings in
DOWNFLOW or HORIZONTAL configurations. See
and
Fig.
24.
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:
• Special Base, KGASB
• Cased Coil Assembly Part No. CNPV, CNRV, CAP, or CAR
• Coil Box Part No. KCAKC
1. Determine application being installed from
2. Construct hole in floor per
3. Construct plenum to dimensions specified in
4. Install special base coil assembly or coil box as shown in
NOTE: It is recommended that the perforated supply-air duct flanges be
completely removed from furnace when installing the furnace on a
factory-supplied cased coil or coil box. To remove the supply-air duct
flange, use wide duct pliers or hand seamers to bend flange back and
forth until it breaks off. Be careful of sharp edges. See
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts, and servicing furnaces.
Connect supply-air duct to supply-air outlet on furnace. Bend flange
inward past 90° with wide duct pliers See
must be connected to ONLY the furnace supply outlet or air conditioning
coil casing (when used). When installed on combustible material,
supply-air duct must be connected to ONLY the factory-approved
accessory subbase, or a factory-approved air conditioning coil casing.
DO NOT cut main furnace casing to attach supply side air duct,
16
BOTTOM
CLOSURE
Fig.
22,
Fig. 19
Table
5.
Table 5
and
Fig.
25.
Table 5
and
Fig.
20.
CAUTION
Fig.
20. The supply-air duct
A170123
Fig.
23,
for proper
Fig.
25.
Fig.
25.
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