Owners Manual Ecos
aire
®
CM Series Precision Air Conditioner
Unit-Duct Connection Ductwork Installation
Ecos
aire
®
July 2007 19
Data subject to change without notice.
Poor return-duct design can prevent proper
dehumidification by causing uneven air dis-
tribution over the evaporator. Reduced
capacity and/or equipment damage may
result.
It is very important to allow straight length
in the return duct as shown. There should
be no elbows, transitions, offsets, or other
flow interruptions closer than 2.5 X WIDTH of
the return duct opening.
If turning vanes are not used in elbows,
allow a length of straight duct equal to at
least 5 X WIDTH.
The straight length is not required for units
with top or bottom return air connections.
Return Duct
Important!
Poor duct design can
reduce the amount of air
delivered.
Duct design must conform to the
ASHRAE low-pressure, low-velocity
duct standards. If there is a ques-
tion concerning duct design, sizing,
choice of materials, air velocities,
or static pressures contact
Ecosaire for assistance.
Air velocities should be kept low
to allow good air movement and
low noise. Higher static pressures
result in higher power requirements
and increased noise. The maxi-
mum external static pressure is
specified for each unit. Static
pressures higher than specified
may reduce air flow below the mini-
mum acceptable value.
Select grilles, registers, and dif-
fusers for low static pressure loss,
required throw, and specified air
flow. Choose hardware resistant to
deterioration due to chemicals in
the pool enclosure.
Δ
Duct material
The Ecosaire
®
unit is suitable for
use with any duct material, subject
to the requirements of this section
and standard practice. Standard
galvanized steel duct is recom-
mended.
All elbows must be equipped with
aerofoil turning vanes and acoustic
insulation.
Where located in areas below
room temperature, ductwork must
be insulated on the outside with 2
inch fiberglass wrap with FSK fac-
ing. All ducts must be designed to
be dry. All seams must be sealed.
Δ
Flexible duct connectors
Use flexible duct connectors to
attach the ducts to the Ecosaire
®
unit. Install the flexible duct in
such a way as to prevent mechani-
cal loads from being applied to the
unit, and to prevent unit vibration
from being transmitted to the duct-
work.
Turning Vanes
Duct Isolator
2.5 X Effective
Duct Diameter
INST
ALLA
TION
SAMPLE
Number
, location, and
appearnce of component
s
may vary
.
