Connecting The Return And Supply Flexible Duct; Plenum Application; Filters; Piping - Goodman GPC 13 SEER H Series Installation Instructions Manual

Ducting work should be fabricated by the installing contractor
in accordance with local codes. Industry manuals may be
used as a guide when sizing and designing the duct system-
such as NESCA (National Environmental Systems
Contractors Association, 1501 Wilson Blvd., Arlington,
Virginia 22209).
The unit should be placed as close as possible to the space
to be air-conditioned allowing clearance dimensions as
indicated. Ducts should run as directly as possible to supply
and return outlets. Use of non-flammable weatherproof flexible
connectors on both supply and return connections at the
unit to reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if
the registers or diffusers are located in the wall or ceiling. A
slab installation is recommended when the registers are low
on the wall or in the floor.
Connecting the Return and Supply Flexible Duct in
Manufactured or Modular Housing Application
The return and supply fittings are to be attached at the unit
to a suitable square to round duct converter. Your distributor
has a factory designed square to round converter transition.
The model #'s of these kits are as follows: Small Chassis
25" SQRPCH101, Medium Chassis 27.5" SQRPCH102, Large
and Extra Large Chassis 32.5:" and 36" SQRPCH103 (See
Specification Sheets for Dimension details).
SQRPCH101 has 14" duct collar on supply and 16" duct
collar (equivalent diameter, opening is oval) on the return.
The SQRPCH102 and SQRPCH103 have 14" duct collar on
supply and 18" duct collar (equivalent diameter, opening is
oval) on the return. The collars are to be slipped into the
openings, and the flanges bent around the converter. The
square to round converter is attached to the flanges of the
square duct openings. The flexible duct is then clamped on
to the collars. Once the duct is affixed to the unit, seal the
collars and flanges with a proper waterproof sealant
(See Figure 3).
It is strongly encouraged to use appropriately sized ducts
based upon the CFM for your application (unit's CFM). If
duct sizing through industry manuals or air duct calculators
require larger ducts than converter openings, run larger duct
size up to unit converter openings and reduce with a reducer
duct fitting or transition right at the unit.
MINIMUM FILTER SIZE
NOMINAL SIZE (INCHES)
10x20
14x20
14x25
15x20
16x20
16x25
20x20
20x25
25x25
NOMINAL AREA (SQ. FT.)
1.4
1.9
2.4
2.1
2.2
2.8
2.8
3.5
4.3
TABLE 1
OUTER FLANGE
STARTER FLANGE
7
6
5
4
3
2
500 1000
The

Plenum Application

A suitable plenum or square duct must be constructed. The
duct cross-sectional area should be determined by industry
duct sizing manuals or air duct calculators.
On ductwork exposed to outside air conditions of
temperature and humidity, use an insulation with a good K
factor, and a vapor barrier. Industry practices should be
followed. Balancing dampers are recommended for each
branch duct in the supply system. Ductwork should be
properly supported from the unit.
NOTE: Proper sealing of all duct work and air handling
compartments is extremely important to overall unit
efficiency.

Filters

Filters are not provided with unit, and must be supplied and
installed in the return duct system by the installer. A field
installed filter grille is recommended for easy and convenient
access to the filters for periodic inspection and cleaning.
Filters must have adequate face area for the rated quantity
of the unit. See air delivery tables (Figure 4) for
recommended filter size.

Condensate Drain

The condensate drain connection of the evaporator is a half
coupling of ¾" N.P.T. A trap must be provided to have
proper condensate drainage.
Unit
Drain
Connection
Flexible
Tubing-Hose
Or Pipe
5
SQUARE TO ROUND
DUCT CONVERTER PANEL
BEAD
FIGURE 3
1500 2000 2500 3000
Airflow - SCFM
FIGURE 4

PIPING

2" Minimum
A Positive Liquid Seal
Is Required
FIGURE 5
3500
3" Minimum