Filters; Typical Suspended Furnace / Crawl Space Installation; Side Return Cutout Markings; Filter Sizes - Unitary products group GY8S*UH Installation Manual

This appliance is design certified for line contact when the furnace is
installed in the horizontal left or right position. The line contact is only
permissible between lines that are formed by the intersection of the top
and two sides of the furnace and the building joists, studs or framing.
This line may be in contact with combustible material. Refer to Figure 3.
When a furnace is installed in an attic or other insulated space,
keep all insulating materials at least 12 inches (30.5 cm) away from
furnace and burner combustion air openings.
SUSPENDED FURNACE / CRAWL SPACE SUSPENDED FURNACE / CRAWL SPACE SUSPENDED FURNACE / CRAWL SPACE SUSPENDED FURNACE / CRAWL SPACE
INSTALLATION INSTALLATION INSTALLATION INSTALLATION
The furnace can be hung from floor joists or installed on suitable blocks
or pad. Blocks or pad installations shall provide adequate height to
ensure the unit will not be subject to water damage. Units may also be
suspended from rafters or floor joists using rods, pipe angle supports or
straps. Angle supports should be placed at the supply air end and near
the blower deck. Do not support at return air end of unit. All four sus-
pension points must be level to ensure quite furnace operation. When
suspending the furnace use a secure platform constructed of plywood
or other building material secured to the floor joists. Refer to Figure 4
for typical crawl space installation.
TABLE 5: Filter Sizes
CFM
(m³/min)
1200 (33.98)
1200 (33.98)
1600 (45.31)
1600 (45.31)
2000 (56.63)
2200 (62.30)
2000 (56.63)
NOTES:
1. Air velocity through throwaway type filters may not exceed 300 feet per minute (91.4 m/min). All velocities over this require the use of high velocity filters.
2. Air flows above 1800 CFM require either return from two sides or one side plus bottom.
SIDE RETURN - EXTERNAL INSTALLATION SIDE RETURN - EXTERNAL INSTALLATION SIDE RETURN - EXTERNAL INSTALLATION SIDE RETURN - EXTERNAL INSTALLATION
Locate and knock out the square corner locators. These indicate the
size of the cutout to be made in the furnace side panel. Refer to Figure 5.
FIGURE 4: Side Return Cutout Markings
Install the side filter rack following the instructions provided with that
accessory. If a filter(s) is provided at another location in the return air
system, the ductwork may be directly attached to the furnace side
panel. An accessory filter rack is available for mounting the filter exter-
nal to the cabinet.
IMPORTANT: Some accessories such as electronic air cleaners and
pleated media may require a larger side opening. Follow the instruc-
tions supplied with that accessory for side opening requirements. Do
not cut the opening larger than the dimensions shown in Figure 1.
Unitary Products Group
Cabinet Side
Size (in)
A 16 x 25
B 16 x 25
B 16 x 25
C 16 x 25
C (2) 16 x 25
C (2) 16 x 25
D (2) 16 x 25
FRONT OF
FURNACE
CORNER
MARKINGS
ANGLE IRON
BRACKET
1" MAX. BETWEEN
6" MIN BETWEEN
ROD & FURNACE
ROD & FURNACE
FIGURE 3: Typical Suspended Furnace / Crawl Space Installation
In any application where temperatures below freezing are possible,
see "BELOW FREEZING LOCATIONS".
SECTION III: FILTERS SECTION III: FILTERS SECTION III: FILTERS SECTION III: FILTERS
FILTER INSTALLATION FILTER INSTALLATION FILTER INSTALLATION FILTER INSTALLATION
All applications require the use of a field installed accessory filter. All fil-
ters and mounting provision must be field supplied. Refer to Tables 5 &
16 for accessory external filter kit options.
Side Bottom
(cm)
40.6 x 63.5 14 x 25
40.6 x 63.5 16 x 25
40.6 x 63.5 16 x 25
40.6 x 63.5 20 x 25
(2) 40.6 x 63.5 20 x 25
(2) 40.6 x 63.5 20 x 25
(2) 40.6 x 63.5 22 x 25
HORIZONTAL APPLICATION HORIZONTAL APPLICATION HORIZONTAL APPLICATION HORIZONTAL APPLICATION
Horizontal Filters
All filters and mounting provision must be field supplied. Filters(s) may
be located in the duct system external to the furnace or in a return filter
grille(s). Filters(s) may be located in the duct system using an external
duct filter box attached to the furnace plenum. Any branch duct (rectan-
gular or round duct) attached to the plenum must attach to the vertical
plenum above the filter height. The use of straps and / or supports is
required to support the weight of the external filter box.
IMPORTANT: Air velocity through throwaway type filters must not
exceed 300 feet per minute (1.52 m/m). All velocities over this require
the use of high velocity filters. Refer to Table 15.
All installations must have a filter installed.
166753-UIM-C-0706
SUPPORT
ROD
1" MAX. BETWEEN
ROD & FURNACE
Bottom
(in) (cm)
35.6 x 63.5
40.6 x 63.5
40.6 x 63.5
50.8 x 63.5
50.8 x 63.5
50.8 x 63.5
55.9 x 63.5
7