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t
DETAIL A
MINIMUM HEIGHT: 36
SEE DETAIL
UNIT HEIGHT
n
RIGGING
CABINET
MODEL
WEIGHT
A
B
C
D
50DU-024
382
75
57
91
158
Small
50DU-030
387
76
58
93
160
50DU-036
469
93
71
113
192
50DU-042
491
97
74
118
201
Large
50DU-048
497
104
63
136
193
50DU-060
548
117
75
149
207
A
A06298
B
D
ACCESS
PANEL
A06296
Fig. 7 - Suggested
Rigging
Step 5--Select
and Install Ductwork
The design and installation
of the duct system must be in accordance
with the standards
of the NFPA
for installation
of non-residence
type
air conditioning
and
ventilating
systems,
NFPA
90A
or
residence
type. NFPA 90B and/or local codes and ordinances.
Select and size ductwork,
supply-air
registers,
and return air grilles
according
to
ASHRAE
(American
Society
of
Heating,
Refrigeration,
and Air Conditioning
Engineers)
recommendations.
The unit has duct flanges on the supply-
and return - air openings
on
the side of the unit.
ELECTRICAL
OPERATION
HAZARD
Failure to follow this warning
could result in personal
injury
or death.
For vertical supply and return units, tools or parts could drop
into ductwork,
therefore,
install a 90 degree turn in the return
ductwork
between
the unit and the conditioned
space. If a 90
degree elbow
cannot be installed,
then a grille of sufficient
strength
and density
should
be installed
to prevent
objects
from
falling
into the conditioned
space.
Units with electric
heaters require 90 degree elbow in supply duct.
When designing
and installing
ductwork,
consider
the following:
1. All units should have field- supplied filters or accessory
filter
rack
installed
in
the
return-air
side
of
the
unit.
Recommended
sizes for filters are shown
in Table 1.
2. Avoid
abrupt
duct size increases
and reductions.
Abrupt
change in duct size adversely
affects air performance.
IMPORTANT:
Use flexible
connectors
between
ductwork
and
unit to prevent
transmission
of vibration.
Use suitable
gaskets
to
ensure weather
tight and airtight seal. When electric heat is installed.
use fireproof
canvas
(or similar
heat resistant
material)
connector
between
ductwork
and unit discharge
connection.
If flexible
duct is
used,
insert a sheet metal
sleeve
inside duct. Heat resistant
duct
connector
(or sheet metal sleeve) must extend 24-in.
from electric
heater element.
3.
4.
Size ductwork
for max possible
air flow (See Table 1).
Seal, insulate,
and weatherproof
all external
ductwork.
Seal.
insulate and cover with a vapor barrier all duc_vork
passing
through
conditioned
spaces. Follow
latest Sheet Metal and
Air
Conditioning
Contractors
National
Association
(SMACNA)
and Air Conditioning
Contractors
Association
(ACCA)
minimum
installation
standards
for residential
heating
and air conditioning
systems.
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