OCEANAIRE 2OACH Series Engineering, Installation And Service Manual page 16

ACCESSORIES
EVAPORATOR RETURN AIR PLENUM
Evaporator return air plenums are available for installations where it is required to
duct air to the inlet of the evaporator. The evaporator return air plenum allows the
user to connect round duct (flexible or rigid) to the return air intake to reduce air noise
and increase the number of options for solving difficult application problems. The
plenum attaches to the front of the unit, replacing the return air grille. Refer to the
table below for configuration and application information.
DEP-10
for 2OACH12 transitions the return air opening to a 10-inch round duct.
2DEP-12
for 2OACH18 & 2OACH24 transitions the return opening to a 12-inch round
duct.
DEP-16
for 2OACH36, 60 transitions the return opening to a 16-inch round duct.
NOTE—When an evaporator return air plenum is installed, it is recommended to set
the evaporator blower speed to high, to avoid coil freeze-up
Plenum Kit
2OACH12 2OACH18 2OACH24 2OACH36 2OACH60
Duct/Flange
DEP-10
10 inch
2DEP-12
12 inch
DEP-16
16 inch
Maximum
Equivalent
Feet
Est. External
Static
Pressure
EVAPORATOR
RETURN AIR PLENUM
✓
✓
25 50
(.20) (.25)
FILTER(S)
✓
✓
60 70
(.25) (.25)
14
.
FILTERS
(1) 10"X20"X1"
(1) 16"X24"X1"
(1) 10"X30"X1"
✓
(1) 12"X30"X1"
80
(.50)