IM 777-8 • Skyline Air Handler 6 www.DaikinApplied.com
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Curb Mounting and Unit Leveling
Do not place a Skyline unit over an open curb unless it is
equipped with a curb-ready base. Installation instructions for
mounting units on a roof curb are provided in
IM 770
. For a
copy, contact your local Daikin representative or visit
www.
DaikinApplied.com
. Make provisions under the unit to divert
any moisture from entering the building below.
For units without roof curb mounting, place the equipment on a
flat and level surface. Where surface irregularities exist, shim
the base of the unit at one or more points along the length of the
rails to prevent distortion or sagging of the support rails. Uneven
or distorted sections cause misfit or binding of the doors and
panels and improper draining of drain pans (
Figure 5
).
If the unit is supported on rails they must be placed around
the entire perimeter. Additional Supports must be placed
perpendicular to airflow spanning the full width of the unit at
all shipping splits. If the unit is over 107" wide these supports
must also be placed at the entering and leaving edges of fan
and cooling coil sections. The perimeter rails must be at least 2"
wide at the top and capable of carrying the entire weight of the
unit. The cross supports must be 4" wide at the top and capable
of carrying the weight of the two sections it spans. The cross
supports shall be placed such that 2" of the top is supporting
each section. The perimeter rails shall be placed so that they are
fully supporting the outer 2" of the unit. If shims are required they
must be placed such that the unit is fully supported.
Figure 5: Leveling the Unit
Assembling Sections
If the unit is shipped in more than one shipping section, rig each
section into position separately. Shipping sections are provided
with a connection splice joint attached on the leaving air side of
the shipping section that seals against the frame channel on the
entering-air side of the adjoining. The splice joint is insulated and
provides an air-tight seal between two sections once they are
assembled together. Align the splice joint to seat into the mating
gasket to provide an air seal. If the splice joint was bent during
shipping or rigging, restore it to its original position (
Figure 10
).
For Custom Air Handling units, ensure that the D-gasket is
attached to the entering air side frame channel (
Figure 8
and
Figure 11 on page 8
).If it dislodged during shipping, restore it
to its designed position.
Shipping Sections
1. Caulk all assembly joints of the unit—Before joining the
sections, apply at least 1/4-inch diameter bead of sealant
to the mating faces of the cabinet. Use the splice joint as a
guide for applying the sealant (
Figure 6
).
2. Pull sections together to fasten. Use straps and a ratchet
to help pull the sections together securely. Apply sealant to
any gaps that may admit moisture.
3.
Fasten base rails together first using the 3/8"-16 × 5" bolts
located in the splice kit provided with the unit (
Figure 8
).
a. To fasten two shipping sections together, four bolts
are needed (two on each side of the unit). The
bolts are run from one base rail into the other and
fastened with a nut. Complete each section bottom
and top before attaching additional sections.
b. If desired, shipping sections for non curb-ready
units can be fastened together internally. To fasten
internally, run field-provided #10 sheet metal screws
or drill screws (4" long, maximum) through the
interior frame channel of one unit into the splice joint
of the neighboring section.
c. Handle units with curb-ready bases and vestibules
so the lifting bracket can be removed after the unit is
placed on the curbing.
NOTE:
Remove the lifting bracket that projects inward over
the curbing. Save the self tapping screws. When the
adjacent section is placed in position, use self tapping
screw to secure the bases together.
Figure 6: Apply Sealant to Mating Faces
