Daikin Skyline Manual

Installation and Maintenance Manual IM 770-1
Group: Applied Air Systems
Part Number: IM 770
Date: March 2014
Skyline®Outdoor Air Handler
Roof Curb

IM 770-1 • SKYLINE ROOF CURB 2 www.DaikinApplied.com
Table of ConTenTs
Table of ConTenTs
General Description ..........................3
Curb-Ready Air Handler .......................3
Unit location .................................3
Curbing Kit ..................................3
Installation...................................6
Curbing Kit Assembly .........................6
Roof curbs with a Vestibule Assembly............6
Prepare Unit for Installation on Curb-ready Base ..7
Install Unit On Roof Curb ......................8

General DesCripTion
www.DaikinApplied.com 3 IM 770-1 • SKYLINE ROOF CURB
General DesCripTion
Curb-Ready Air Handler
The Skyline outdoor air handler unit can be equipped with a
base assembly that provides a mechanical t and seal to the
building’s Island Roof Curbing. Skyline outdoor air handlers
must be ordered from the factory with one of two possible
options in order to mount the unit on a roof curb. The rst
options are the curb ready base option where the unit will be
delivered in multiple pieces and will have to be assembled on
the roof curb. The second option is the unitized base option
where the unit will be delivered, lifted, and installed on the
roof curb as a single piece. Neither base is availabe for eld
application to the air handler.
Figure 1 shows various base rail options for Skyline outdoor air
handlers. Units that do not have base rails and units with standard
base rails must NOT be used with open curbs of any type.
Figure 1: Base Rail Options
The information provided in these instructions describes
the curb kits that are ordered and provided with the Skyline
outdoor air handler. The curb kits are intended to be installed
as described and are not intended to be modied or used in
conjunction with other curb mounting features or apparatus.
The dimensional and support requirements are outlined to
provide a basis for eld designed and applied roof curbs. It
is important that the weight and strength factors be carefully
followed when applying this roof curb and any curbs that may
be eld designed.
The curbing must support the air handler uniformly to keep the
cabinet square and true. Uneven curbing support can cause
distortion of the cabinet and the door openings.
Unit location
The structural engineer should be involved to verify that the
roof has adequate strength and ability to minimize deection.
Extreme caution should be taken when using a wooden roof
structure. Units should also be located away from building
ue stacks or exhaust ventilators to prevent possible entry
of contaminated air through the outside air intake. Sufcient
space should also be allowed around the unit for service
clearance.
Locating the unit away from occupied spaces and over utility
areas, corridors, and auxiliary spaces will help reduce the
transmission of sound and vibration to occupied spaces. A
concrete deck or pad is recommended when the unit is located
over an occupied space where good acoustics are essential.
See the installation instructions (IM 777) for more details on
locating units.
Curbing Kit
The Skyline air handler roof curb kit is shipped unassembled
and requires eld assembly and attachment to the eld
designed building structural support. The building structural
supports for curb mounted units must be approved by qualied
individuals. It is important to follow all building codes and
roong standards.
The unit dimensions, weights and component details are
provided within the submittal documents and are unique for
each unit. The submittal documents also indicate the functional
components within the air handler. While the total weight of
each unit section is shown in the submittal documents, the
locations of coils, motors and fans can cause part of the load
to be concentrated in one area of an air handler section.
Appropriate safety factors should be used to account for the
weight distribution in determining structural load.
Allowance must be made for routing the air ducts through
the roof curb. Refer to the submittal data for each unit for the
proper dimensions of duct openings prior to installing ductwork.
Figure 2 shows a typical submittal drawing for a curb-ready
Skyline air handler. The unit submittal drawing illustrates the
roof curb layout of the unit. The drawing shows the outline of
the air handler unit, the outside dimension of the curbing top
ange and the inside dimension of the curbing. The Skyline
units may have piping vestibule sections included as part of
the unit selection and the roof curb will also have a vestibule
curbing section attached to it. The submittal drawing shows the
location and dimensions for the piping vestibule.
The submittal drawings also show the locations and
dimensions of the air duct passages in the roof curb. The roof
curb may be ordered as a unit option or it can be eld supplied.
View A shows a side view of the cabinet and View B shows an
end view. If the unit is ducted in the middle (not adjacent to the
curb), no allowances are required (View C).

IM 770-1 • SKYLINE ROOF CURB 4 www.DaikinApplied.com
General DesCripTion
Figure 2: Typical Submittal Drawing and Air Duct Allowances through the Roof Curb

General DesCripTion
www.DaikinApplied.com 5 IM 770-1 • SKYLINE ROOF CURB
Figure 3: Roof Curb Features
Figure 3 illustrates the features of the roof curb. Intermediate
support channels are provided for support of the supply
and return air ducts. If the curbing is eld supplied, the duct
supports can be provided in accordance with the installation
requirements.
Intermediate supports are provided in the curb assembly
at all points where the curb rails require two sections to be
joined. For eld provided roof curbs, it is recommended that
intermediate supports be incorporated as appropriate for lateral
rigidity of the roof curbs.
Intermediate supports are also provided on roof curbs that are
over 107 inches wide. These supports are required at all points
where the roof curb sides are joined. Support is also required
at the entering and leaving edges of cooling coil sections and
fan sections. These intermediate supports are required on all
wide unit curbs to provide support to the unit across the open
span of the curb.
5.1ʺ
1.66ʺ
3.1ʺ
1.66ʺ
Unitized Base Vestibule Assembly
Curb-ready Base
Vestibule Assembly

IM 770-1 • SKYLINE ROOF CURB 6 www.DaikinApplied.com
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Curbing Kit Assembly
The weight of the unit is concentrated and supported at the
inside wall of the roof curb. The structural system of the
building and the interface with the curb must provide support at
the points of concentrated loads. See Figure 4.
Figure 4: Weight of unit on roof curb
Each curb kit contains a hardware package. The package
contains 3/8–16 × 1ʺ bolts and nuts for assembly of the curb.
Two 1/4–20 × 1/2ʺ screws are included when the unit has a
vestibule. Rolls of gasket are included to cover the top surfaces
of the curb and supports.
The hardware kit includes a layout and assembly drawing of
the curbing with a sketch of the assembly.
Compare the curb layout drawing to the submittal documents
for the air handler to conrm that the details match.
Figure 3 illustrates a typical layout drawing of the roof curb.
Note that each air handler will have a dedicated drawing that
corresponds with the features that are included in the unit.
The curbing parts should be laid out according to the assembly
drawing. The drawing shows dimensions of the parts and
locations of intermediate cross members. The curb parts have
labels attached that correspond with the locations of the parts.
Parts that are identical have the same part numbers. End parts
have number CU122 and center supports have number CU140.
The side supports are shown with sequential numbers CU137,
CU 237 and so on for parts on one side of the drawing.
Likewise, parts on the other side have sequential numbers CU
132, CU 232 in progression. The curb parts for the vestibule
are marked with labels CU 152, CU 156 and CU162.
The dimensions for the locations of all parts are shown and
should be checked carefully for proper assembly order.
Assemble the curb with the 3/8 inch diameter bolts and nuts
that are provided. Always check the dimensions of the curb
before nal installation to the roof and building structure. Also
check to be sure the curb is square and level.
Roof curbs with a Vestibule
Assembly
NOTE: The vestibule assembly channel, part number CU146
must be attached to the vestibule curb assembly
before the vestibule assembly is attached to the main
roof curb. Use two 1/4 ×1/2 screws to attach the
channel.
The vestibule assembly is then attached to the main roof curb
by sliding the rear vertical ange of the vestibule curb under
the lip of the main roof curb. Apply sealant and gasket material
after the vestibule curb is in place. See Figure 5.
Figure 5: Install Vestibule Assembly on Main Roof Curb

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www.DaikinApplied.com 7 IM 770-1 • SKYLINE ROOF CURB
Prepare Unit for Installation on Curb-ready Base
THE UNIT MUST BE LIFTED AS INDIVIDUAL SECTIONS
ONLY. Some sections require removal of the lifting bracket to
allow mating of the adjacent section(s). See Figure 10.
A length of “D” gasket is attached to each section. This gasket
MUST be installed to the unit base section as shown in Figure 6.
Figure 6: Attaching “D” Gasket
CAUTION
The gasket is to be installed in an arc shape with the ends
lower than the center so that any moisture that may reach the
gasket will be drained to the outside of the unit.
Apply a bead of sealant to the complete perimeter of the
mating surface that has the splice collar projecting from the
frame. Use the frame as a guide as illustrated in Figure 7
Figure 7: Applying Sealant
A hardware package is included in each unit section that
contains the bolts and nuts for fastening the unit sections
together. Be sure to locate the hardware before the unit is
placed over the open roof curb.
Fasten each section at both the bottom and the top using the
bolts and hardware before setting the next section in position.
Refer to Figure 8 and Figure 9.
Figure 8: Fasten Bottom of Section
Figure 9: Fasten top of unit
“D” Gasket
5/16" diameter bead
centered in the face
of the clearance Use
splice joint
as a guide
3/8 – 16 × 1" Bolt and Nut
Splice
Plate
Slide Splice Cap on
and bend ends down
5/16 × 3/8" Bolt
5/16 × 3/8" Nut

IM 770-1 • SKYLINE ROOF CURB 8 www.DaikinApplied.com
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Install Unit On Roof Curb
Check to see that all lifting brackets are secure and that the
rigging cables and straps are clear of door handles or any
other appendages of the unit.
The units have two inch interlocking splice collars at each
mating face. Care must be used so that the anges engage as
the unit sections are mounted together. The units must be set
tightly together during lifting as the curb gasket will grip the unit
base and make moving the unit difcult.
Units with vestibules must be handled so that the lifting
bracket can be removed after the unit is placed on the curbing.
Remove the lifting bracket that projects inward over the
curbing. Save the self tapping bolts. When the adjacent section
is placed in position, use self tapping bolts to secure the bases
together as illustrated in Figure 10.
Complete cabinet by placing sealant over any areas that
appear to have remaining gaps. Install the cabinet top strips as
indicated in IM 672 that is included with the air handler.
Assemble and install all air hoods in accordance with the
instructions that are provided with hood.
Figure 10: Remove Vestibule Lifting Bracket
Installation of Piping and Wiring
CAUTION
The base section of each cabinet has a drip pan installed
below every panel that drains to the outside frame trough. Any
holes cut through the bottom of the unit must also penetrate
the drip pan. If holes are cut in the drip pan, they must be
sealed to prevent moisture leakage.
Be sure that all piping, wiring and control penetrations that are
made through the unit panels and oors are thoroughly sealed
on both the inside and outside of the cabinet.
A single metal thickness pan is provided in the bottom of the
vestibule. The pan can be removed if necessary. If holes are
cut into the pan for piping passage, the holes must be sealed
to prevent moisture leakage.
Removable Lifting Bracket

IM 770-1 (03/14) ©2014 Daikin Applied | (800) 432–1342 | www.DaikinApplied.com
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