6021585-FTG-A-0421
Johnson Controls Ducted Systems
3
FILTER PERFORMANCE
The airflow capacity data published in the
Blower Performance
table shown represents blower performance WITHOUT filters.
All applications of these furnaces require the use of field
installed air filters. All filter media and mounting hardware or
provisions must be field installed external to the furnace cabi-
net. DO NOT attempt to install any filters inside the furnace.
1. Air velocity through throwaway type filters may not exceed 300 ft/min
(91.4 m/min). All velocities over this require the use of high velocity filters.
2. Do not exceed 1800 CFM using a single side return and a 16x25 filter. For
CFM greater than 1800, you may use two side returns or one side and the
bottom or one return with a transition to allow use of a 20x25 filter.
ACCESSORIES
Side Return Filter Racks
-
The S1-1SR0402 Kit accommo-
dates a 1-in. filter only.
S1-1SR0402 - All Models
Bottom Return Filter Racks
-
The S1-1BR05* series are gal-
vanized steel filter racks. The S1-1BR06* series are pre-painted
steel filter racks to match the appearance of the furnace cabi-
net. The S1-1BR05* and S1-1BR06* series filter racks accom-
modate a 1-in., 2-in., or 4-in. filter.
S1-1BR0514 or S1-1BR0614 - For 14 1/2-in. cabinets
S1-1BR0521 or S1-1BR0621 - For 21-in. cabinets
Masonry Chimney Kit
- This accessory kit allows upflow 80%
models to be vented into a tile-lined masonry chimney.
S1-1CK0604 - All 80% Non-modulating Models
Thermostats -
Compatible thermostat controls are available
through accessory sourcing. For optimum performance, these
outdoor units are fully compatible with our residential Hx™
Touch Screen Thermostats available through Source1. For
more information, refer to the
Thermostats & Controllers
section
of the
Offering Catalog
.
NOTICE
Single side return above 1800 CFM is approved as long as
the filter velocity does not exceed filter manufacturer’s rec-
ommendation and a transition is used to allow use on a
20x25 filter.
Recommended Filter Sizes
CFM
Cabinet
Size
Side
(in.)
Bottom
(in.)
1200 (34.0)
A
16 x 25
14 x 25
1600 (45.3)
C
16 x 25
20 x 25
2000 (56.6)
C
(2) 16 x 25
20 x 25
Unit Clearances to Combustibles (All dimensions in in. (cm), and all surfaces identified with the unit in an upflow
configuration)
Application
Top
Front
Rear
Left
Side
Right
Side
Flue
Floor/
Bottom
Closet
Alcove
Attic
Line
Contact
Upflow
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
6 (15.2)
Combustible
Yes
Yes
Yes
No
Upflow B-Vent
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
1 (2.5)
Combustible
Yes
Yes
Yes
No
Horizontal
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
6 (15.2)
Combustible
No
Yes
Yes
Yes
1
1. Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the furnace jacket and building
joists, studs, or framing.
Horizontal B-Vent
1 (2.5)
1 (2.5)
0 (0.0)
0 (0.0)
0 (0.0)
1 (2.5)
Combustible
No
Yes
Yes
Yes
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