Ducting; Connecting The Return And Supply Flexible Duct In Manufactured Or Modular Housing Application - Daikin DP5HH2441 Series Installation Instructions Manual

36"
Do not, under circumstances, connect return ductwork to
any other heat producing devices such as a fireplace insert,
stove, etc. Unauthorized use of such devices may result in
property damage, fire, carbon monoxide poisoning, explo-
sion, personal injury or death.

Ducting

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
Figure 2
WARNING
32.5:" and 36" SQRPCH103 (See Specification Sheets for
Dimension details). The 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
24"
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
36"
reducer duct fitting or transition right at the unit.
NOMINAL SIZE (INCHES)
OUTER FLANGE
STARTER FLANGE
7
6
5
4
3
2
500
5
MINIMUM FILTER SIZE
NOMINAL AREA
10x20
14x20
14x25
15x20
16x20
16x25
20x20
20x25
25x25
Table 1
SQUARE TO ROUND
DUCT CONVERTER PANEL
Figure 3
1000 1500 2000 2500
Airflow - SCFM
Figure 4
(SQ. FT.)
1.4
1.9
2.4
2.1
2.2
2.8
2.8
3.5
4.3
3000 3500