Daikin Skyline OAH003GDAC Manual

Installation and Maintenance Manual IM 777-17
Group: Applied Air Systems
Part Number: IM 777
Date: December 2019
Skyline®Outdoor Air Handler

IM 777-18 • SKYLINE OUTDOOR AIR HANDLER 2 www.DaikinApplied.com
Table of ConTenTs
Table of ConTenTs
Introduction..................................3
General Information ........................3
Receiving and Handling .....................3
Unit Storage ..............................4
Mechanical Installation ........................5
Service Clearances .........................5
Rigging ..................................5
Curb Mounting and Unit Leveling ..............6
Assembling Sections ........................6
Shipping Sections ..........................6
Panels, Frame Channels, and Doors ...........8
Field Mounting Junction Boxes and
Other Components ........................10
HEPA Holding Frame, Filter, and
Prelter Installation ........................10
Duct Connections .........................15
Dampers and Hoods .......................16
Mounting Actuators ........................16
Angled Economizer Actuator Access ...........16
Isolation Dampers for Multiple Fans ............17
Piping Vestibules ..........................17
Piping and Coils ..........................20
Internal Isolation Assembly Adjustment ........24
OSHPD Seismic Anchoring/Mounting ..........26
Electrical Installation .........................27
Wiring ..................................27
Operation Guidelines ........................29
Startup Checks ...........................29
Before Starting the Unit .....................29
VFD Setup ..............................30
Fan Startup ..............................30
Fan Wheel Alignment ......................30
Setscrews ...............................33
Daikin Fan Array ..........................34
Daikin EC Fan Array .......................38
Operating Limits ..........................42
Fan Vibration Levels .......................43
Gas Furnace ................................44
Indirect Fired Tube Heater ...................44
Wiring/Controls ...........................46
Rack Furnace.............................53
Direct Fired Heater.........................56
Operation of the Basic pCO5+ Carel Controller ...58
BACnet Points ............................60
Service and Maintenance . . . . . . . . . . . . . . . . . . . . . 61
Periodic Maintenance ......................61
Fan Drive ...............................62
Fan Drive Belt Adjustment ..................66
Front Load Filter Option ....................67
Filter Gauges ............................67
Coils ...................................68
Winterizing Water Coils .....................68
Removing and Replacing Components ........68
Parts, Service and Warranty Procedure .........71
Replacement Parts ........................71
Warranty ................................71
Warranty Return Material Procedure ...........71
Check, Test and Warranty Registration Form .....72
Quality Assurance Survey .....................78

InTroduCTIon
www.DaikinApplied.com 3 IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
InTroduCTIon
General Information
WARNING
Sharp edges and coil surfaces are a potential injury hazard.
Avoid contact.
The system design and installation must follow accepted
industry practice as described in the ASHRAE Handbook, the
National Electric Code, and other applicable standards. Install
this equipment in accordance with regulations of authorities
having jurisdiction and all applicable codes.
Installation and maintenance must be performed by qualied
personnel familiar with applicable codes and regulations and
experienced with this type of equipment. Sheet metal parts,
self-tapping screws, ns, clips, and such items inherently have
sharp edges; the installer should exercise caution.
Receiving and Handling
Inspection
• Carefully check items against the bills of lading to verify
all crates and cartons have been received. Carefully
inspect all units for shipping damage. Report damage
immediately to the carrier and le a claim.
Packaging
• All shipping wrap material, including stretch and shrink
wrap, must be removed upon unit arrival. This wrapping is
for transit protection only. Units are not to be stored with
wrapping material left on, as white rust will develop if any
moisture is present.
• Field-installed components, such as vestibules or shipped
loose controls, will ship on separate skid(s).
• Hardware (screws, bolts, etc.) for assembling sections
are supplied in a bag attached to each section. NOTE: A
special #30 Torx bit is required for assembly.
Identication
• Every shipping section includes a nameplate identifying
the customer tagging information, unit serial number,
unit order number, and the shipping section position for
installation.
Handling
• Skyline air handler units are constructed of painted or
galvanized steel and are inspected thoroughly before
leaving the factory. Take care during installation to
prevent damage to units. Do not stand or walk on top of
units.
• Air handler bases are designed with the necessary
number of lifting points for safe installation. All lifting
locations must be used. See Rigging.
• Take special care when handling blower sections. All
fans are dynamically balanced before leaving the factory.
Rough handling can cause misalignment or a damaged
bearings or shaft. Carefully inspect fans and shaft before
unit installation to verify this has not happened.
Nomenclature
OAH 003 G D A C
Model
OAH = Custom modular air handler
OAC = Custom modular component
Nominal unit size
(cataloged size—nominal square foot of coil)
003, 004, 006, 008, 010, 012, 014, 017,
021, 025, 030, 035, 040, 050, 065, 080, 085, 090
Vintage of Daikin air handling unit
Unit type/coil position
B = Blow-through cooling coil location
D = Draw-through cooling coil location
H = Heating only
V = Vent only
M = Multizone
Unit cross section
C = Standard unit cross section
M = Custom size cross section
Motor location
A = Motor along side of fan housing
C = Motor downstream of ECM fan
D = Motor downstream of belt-drive plenum fan
F = Motor on inline fan
G = Motor downstream of direct-drive plenum fan
H = Motor downstream of direct-drive plenum
fan in fan array
T = Motor behind twin fan housing

IM 777-18 • SKYLINE OUTDOOR AIR HANDLER 4 www.DaikinApplied.com
InTroduCTIon
Unit Storage
• Skyline units may be stored outdoors. Follow the below
instructions to ensure proper storage. Any damage to the
unit resulting from improper storage will not be covered
by Daikin Applied.
• Ensure no moisture, debris, or minerals are on the unit
prior to storage, as these can cause cause permanent
damage to the cabinet and components.
• Store units in a clean, dry environment on a level surface.
Ensure units are on a dry surface or raised off the ground
to protect components from any standing water; ensure
adequate support is used to prevent the unit or section
base from sagging, if raised.
• All openings, including dampers and bottom openings,
must be covered to protect from rain, snow, dust, and
animals. Do not use plastic tarps to cover the unit, as
condensation can form on the air handler resulting in
corrosion or stains. Use only canvas tarps to ensure the
inside of the unit remains clean, dry, and ventilated. Do
not allow coverings to trap moisture on surfaces.
• All tarps should be inspected frequently to ensure the
integrity of the tarp is maintained and to prevent damage
to the unit by the elements. Any damage to the tarp
should be repaired immediately.
• It is recommended that the unit interior be inspected
daily to observe whether condensation is occurring and if
temporary or routine ventilation of the interior is needed
to control condensation. Units should be inspected at
different times of the day to ensure varying weather
conditions are not causing condensate to occur.
• All shipping wrap material, including stretch and shrink
wrap, must be removed upon unit arrival. Units are not to
be stored with wrapping material left on, as white rust will
develop if any moisture is present.
• A eld-supplied desiccant bag may be hung in the
interior of the unit to minimize corrosion in humid storage
environments.
• Do not stack sections or store anything on top of units.
• Isolate unit from shock and vibration.
• Do not clean galvanized steel surfaces with oil dissolving
chemicals. This may remove the protective coating and
accelerate corrosion.
• Pack fan and motor bearings (unless motor bearings
are sealed) with compatible grease while the fan shaft is
stationary. After grease has been installed, rotate shaft a
minimum of 10 rotations.
• Once a month, rotate shaft a minimum of 10 revolutions.
Ensure the stopped position is different than the original
position.
• Coat shafts with lubricant as needed to prevent corrosion.
• Inspect all doors and openings once a month to ensure
they are closed and properly sealed.
• Loosen belt tension on belt-driven fans, if storing for more
than two (2) months.
Belt driven fans:
• Reduce belt tension by at least 50% or remove the belts.
Remove belts if they will be subjected to temperatures
exceeding 85°F to avoid deterioration.
• Remove belt guard when adjusting belts
• Reduce belt tension prior to removing or installing belts.
Removing or installing tensioned belts may cause
personal injury and damage to the sheaves, belts,
bearings or shafts.
• Adjustable sheaves should be opened as wide as
possible and the adjustment threads lubricated so they
do not corrode. Be careful not to put lubricant on the belt
running surface
Prior to start up:
• Set screws on bearings, fan wheels, and sheaves need to
be checked for proper torque. Also check bolt torque for
any taper lock hubs either on the wheel or sheaves.
• Check sheaves for corrosion. Signicant corrosion can
cause belt or sheave failure.
• Purge old grease from fan bearings while rotating the
shaft to distribute the new grease evenly and prevent
bearing seal failure.
• Correctly align and tension belts. See General Rules of
Tensioning on page 67

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MeChanICal InsTallaTIon
Service Clearances
In addition to providing adequate space around the unit for
piping coils and drains, access to at least one side of the unit
is always required to allow for regular service and routine
maintenance, which includes lter replacement, drain pan
inspection and cleaning, fan bearing lubrication, and belt
adjustment. Provide sufcient space—at least equal to the
length of the coil—on the side of the unit for coil removal. See
Figure 1 for servicing space requirements.
Maintain at least 54" of clearance in front of electrical power
devices. Electrical power devices that are mounted on the side
of the unit typically are up to 12" deep (Figure 2). Fan sections
with multiple fans have motor control boxes up to 16" deep
when supplied with VFDs.
Figure 1: Servicing Space Requirements
Figure 2: Service Clearance for Electrical Power Devices
Rigging
WARNING
Use all lifting points. Improper lifting can cause severe
personal injury and property damage.
CAUTION
Lifting points may not be symmetrical to the center of gravity
of the unit. Ballast or unequal cable lengths maybe required.
Skyline air handlers ship as separate sections, completely
assembled, or in modules of assembled sections. The unit
must be rigged as it ships from the factory. Do not rig units
after assembly. Units are provided with a factory-installed base
rail and can be lifted using the 2" diameter lifting holes located
in the corners of each shipping section. To prevent damage to
the unit cabinetry, use spreader bars. Position spreader bars
to prevent cables from rubbing the frame or panels. Before
hoisting into position, test lift for stability and balance. Avoid
twisting or uneven lifting of unit.
Figure 3: Six Point Rigging (Unitized Base Only)
Figure 4: Eight Point Rigging (Unitized Base Only)
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


IM 777-18 • SKYLINE OUTDOOR AIR HANDLER 6 www.DaikinApplied.com
MeChanICal InsTallaTIon
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
at 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 mist 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 airow 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 to the cabinet
which seals against the gasket of the frame channel on the
adjoining shipping section. The splice joint provides an air
seal between two sections once they are assembled together.
Some unit congurations require multiple splice joints on the
same face or on opposing faces of a single section. Conrm
correct placement and orientation of unit sections and splice
joints based on included unit drawings. Align all splice joints 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 high pressure low leakage units,
ensure that the D-gasket is attached to the entering air side
frame channel (Figure 8 and Figure 11).If it dislodged during
shipping, restore it to its designed position. Note: Some sections
are shipped with shipping braces.These need to be removed
before connecting the shipping sections. (Figure 6)
Figure 6: Shipping Braces
Shipping Sections
IMPORTANT
The factory supplied D gasket must be eld installed prior to
pulling ship sections together. Install D gasket at all section
splits on the mating face of the base rail 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.
(Figure 8).
1. Add a lubricant to top of curb gasket to allow sections to
slide together easier.
2. Apply a minimum 1/4" bead of caulk to the mating faces
of frame channels and roof panels at all section splits
of the unit before joining the sections together. Also
adhere the factory supplied, eld installed “D” Gasket to
the mating face of the base rail at all section splits in the
shape of an arc to divert any moisture to the outside of
the unit. (Figure 6).
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 

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3. Ensure the splice collar lines up with the opening in the
mating section. Use clamps or threaded rod at the base
lifting lugs to pull the sections closer. Be careful to not
damage them. Use the 3/8"-16 × 1" bolts located in the
splice kit provided with the unit to pull the bases together
via the holes in the lifting lugs. (Figure 8). Use ratchet
straps to pull the top of sections together.
a. To fasten two shipping sections together, eight nuts
and bolts are required (two on the top, two on the
bottom on each side of the unit) which are factory
supplied in the splice kits with each unit. Complete
each section top and bottom before attaching
additional sections. (Figure 8).
b. If the bottom internal splice collar gap is larger than
1/4", add sealant to that gap.
c. For sections with vestibules, after the vestibule
section is on the curb, remove the vestibule lifting
brackets and slide sections together. (Figure 7).
Figure 7: Apply Sealant to Mating Faces
Figure 8: Sections with Vestibules
Figure 9: Fasten Sections Together
Add minimum ¼"bead of caulk on
mating faces of frame channels
and roof panels at all section splits
Factory supplied “D” gasket,
eld-installed in the shape of
an arc to divert moisture to the
outside of the unit

IM 777-18 • SKYLINE OUTDOOR AIR HANDLER 8 www.DaikinApplied.com
MeChanICal InsTallaTIon
d. For certain high pressure low leakage units,
use the provided section joining plates to fasten
sections together. Space them as shown in Figure
9. Using the provided ¼"-14 × 1" self tapping
screws, drill screw the joining plates into the frame
channel on each section, keeping unit sections
tight together. Follow instruction drawing included
in the assembly kit.
4. After sections are seated tightly together, add caulk
to the external section split joint from top to bottom.
DO NOT caulk the bottom of the base rail at the section
split. This seam acts as a weep hole.
5. After sections are seated tightly together, add caulk to ll
the seam between the roof panels at each end. Slide the
splice cap over the top panel anges. Bend the ends of
the splice cap down to secure in place (Figure 12)
6. Assemble the small splice plate at the top rail to secure
the sections together at the top. Use 5/16" bolts (Figure
12).
Figure 10: Frame Channel Stiffener Plates (High Pressure
Low Leakage Units Only)
Figure 11: Splice Collar Alignment
Figure 12: D-Gasket Placement Detail (High Pressure Low
Leakage Units Only)
Figure 13: Splice Cap and Splice Plate
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  
Slide splice cap over
roof panel anges and
bend down end anges Add sealant to
end seams of
mating roof panels

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www.DaikinApplied.com 9 IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
Panels, Frame Channels, and
Doors
Panel Removal
To remove a side or top panel, remove the at head Torx 30
fasteners along the sides of the panel. Lift off the panel after
removing all fasteners.
Frame Channel Removal
Frame channels that run the length of the unit along the top
can be removed to allow access to both the side and top of
the unit. To remove the frame channel, rst remove the side
panel(s). Once the side panel is off, remove the at head Torx
30 fasteners in the corner of the frame channels. Then pull the
frame channel out the side. Remove any panel screws that are
within one inch of the of the frame since they are engaged into
the gasketed ange of the frame (Figure 13).
Figure 14: Removing Panel Screws
Access Doors and Panels
For routine maintenance, access normally is obtained through
access doors or by removing side panels. Removing all at head
fasteners along the sides of a panel allow it to be removed.
Fan and lter sections are always provided with a service door
on one side of the unit. If requested on order, doors can be
provided on both sides of the unit. Optional service doors are
available for most section types and are provided based on
customer request.
Fan Section Doors
WARNING
Sharp edges and coil surfaces are a potential injury hazard.
Avoid contact.
NOTE: Opening fan section doors requires using a 17 mm
socket wrench (Figure 14), which satises ANSI
standards and other codes that require the “use of
tools” to access compartments containing moving
parts or electrical wiring.
Figure 15: Opening Fan Section Door
Figure 16: Cutting/Sealing Injected-Foam Insulated Panels
Remove panel
to remove frame
Remove any
panel screws that
engage frame
Cut hole from both sides of panel
Seal completely with silicone
sealant or duct seal compound
Prop 65—Substances in fuel or from fuel combustion can cause personal injury or death,
and are known to the State of California to cause cancer, birth defects or other reproductive harm.

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Injected-Foam Insulated Panels
Skyline air handlers now are furnished with double-wall,
injected-foam insulated panels. Foam panels are stronger,
more rigid, and lighter than panels with berglass insulation.
The insulation R-value is improved to 13. However, foam
insulation can burn when exposed to ame or other ignition
sources and release toxic fumes. Take care in cutting and
sealing all eld-cut openings in these panels.
Panel Cutting Procedure
WARNING
Flame and smoke can
cause equipment damage,
severe personal injury, or
death. Before operating unit,
seal all piping and wiring
holes on both inner and outer
panels with an industrial
grade silicone sealant or duct
seal compound. Do not use
a cutting torch or expose
panel to re. Panel damage
can occur.
1. Determine the number and location of holes required for
electrical conduit, piping, and control wiring as follows:
a. Check that adequate space is available inside the
unit for conduit or pipe routing.
b. Do not locate holes in a panel that provides access
to key maintenance components such as lters
and fan assemblies.
c. Do not locate where the conduit or piping blocks
airow or obstructs hinged access doors.
2. Once a proper location is determined, drill a small pilot
hole completely through the panel. Then use a sharp
hole saw or a saber saw and cut from each side of the
panel.
3. Seal the double-wall panel on each side with an
industrial/commercial grade silicone sealant or duct seal
compound. It is extremely important to seal each panel
hole or penetration securely so it is airtight, watertight,
and so that there is no exposed insulation.
Field Mounting Junction Boxes and
Other Components
For eld mounting 4" × 4" or smaller junction boxes to the
standard panel exterior, use a minimum quantity of four, 3/16"
diameter pop rivets. Do not use self-tapping drill screws.
They will not tighten nor secure properly and panel
damage can occur.
If larger, heavier components require mounting on unit panels,
use through-bolts with at washers through both outer and
inner panels. To maintain panel integrity, seal both ends with
an industrial/commercial grade silicone sealant or duct seal
compound.
The unit frame channel is another excellent location for
securing heavier components; self-tapping screws are not
acceptable. Ensure that the location permits the full operation
of all access doors and panels and does not interfere with
other vital components.
HEPA Holding Frame, Filter, and
Prelter Installation
These instructions are for installing AAF HEPA lters (11-1/2"
depth) into AAF HEPA Holding Frames.
Please read the entire installation instructions before beginning
the installation process.
Install lters into the HEPA Holding Frames only after the
frames have been securely installed into existing ductwork or
housing. Frames should be bolted or pop riveted together into
the permanent structure through the pre-drilled holes around the
outside perimeter of the frames. Frames should be sufciently
caulked and sealed to prevent any air bypass or leakage.
Required tools for lter installation:
• T-handle Hexkey, size 5/32"
Framing Components Required:
• AAF HEPA Holding Frames
—P/N 910111491 & 910111674
• Leg Extensions, 4 per frame (A)
—P/N 910111494
• Latches, 4 per frame
—P/N 910111493 (B) (without prelters)
—P/N 910123164 (C) (with prelters)
• Prelter Holding Frames (when prelters are ordered)
—P/N 910123166 & 910123168
• Prelter Latches (when prelters are ordered)
—P/N 111048304 & 111048305

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Figure 17: Leg Extensions and Latches without Prelters
Figure 18: Leg Extensions and Latches with Prelters
AAF HEPA Filters without Prelters
STEP 1: At the inside corner of each frame are 4 tabs, 2 per
side. Place a leg extension over the 4 tabs as shown in Figure
18, then pull back on the leg extension locking it into place
(Figure 19).
Repeat Step 1 with each of the 4 corners. The frame with leg
extensions should look like Figure 20.
Figure 19: Place Leg Extension over the Frame Tabs
Figure 20: Pull Back to Lock the Leg Extension into Place
A
A
A
A
B
B
B
B
A
A
A
A
C
C
C
C

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STEP 2: Insert the HEPA lter into the HEPA Holding Frame.
The HEPA should be installed with the gasket side of the
lter facing the frame. Insert the lter as far into the frame as
possible, so that the gasket material is contacting the frame.
See Figure 21.
The lter should now be resting inside of the holding frame.
When installing the lters into a frame bank of multiple frames,
install the lower lters rst so that the upper lters can rest on
the lower lters (Figure 22).
Figure 21: Frame with Leg Extensions Installed
Figure 22: Insert HEPA Filter into Frame, until the Gasket
Comes in Contact with the Holding Frame
STEP 3: Place a latch so that it overlaps the leg extension,
as shown in Figure 23. Align the latches’ cap screw with
the threaded coupling on the end of the leg extension and
tighten using the hexkey. Tighten the cap screw until there
is an approximately 1/4" gap between the latch and the leg
extension coupling as shown in Figure 24. Repeat this step
with all 4 corners.
Figure 23: Filter Placed Inside of Frame
Figure 24: Latch Overlapping Leg Extension
Figure 25: Tighten Cap Screw to 1/4”of the Coupling

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STEP 4: Once all four corner latches have been tightened
within 1/4" of the leg extension coupling, complete the
installation by tightening each corner until the latch and leg
extension coupling meet. This is illustrated in Figure 25.
Once all four corners have been tightened the lter should now
be properly seated and sealed.
Repeat the process with all remaining lters working from the
bottom to the top.
Figure 26: Tighten until Latch and Coupling Meet
Figure 27: Properly Installed Filter Inside of the Frame
AAF HEPA Filters with Prelters
Follow previous steps 1-2, then continue straight to step 5.
STEP 5: The prelter holding frame should be placed directly
in front of the HEPA lter as shown in Figure 27.
Figure 28: Positioning of the prelter frame
STEP 6: Place a latch so that the 2 tabs of the latch overlap
the prelter frame on each side of the corner. Slide the latch
inside of the leg extension and align the latches’ cap screw
with the threaded coupling on the end of the leg extension and
tighten using the hexkey. See Figure 28.
Tighten the cap screw until there is an approximately 1/4" gap
between the latch and the leg extension coupling as shown in
Figure 29. Repeat this step with all 4 corners.
STEP 7: Once all four corner latches have been tightened
within 1/4” of the leg extension coupling, tighten each corner
until the latch and leg extension coupling meet. This is shown
in Figure 30.
Figure 29: Latch Positioning for Prelter Frame

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MeChanICal InsTallaTIon
Figure 30: Tighten Cap Screw to 1/4"of the Coupling
Figure 31: Tighten until Latch and Coupling Meet
Once all four corners have been tightened the HEPA lter
should now be properly seated and sealed.
Repeat the process with all remaining lters working from the
bottom to the top.
Figure 32: Properly Installed HEPA Filter

MeChanICal InsTallaTIon
www.DaikinApplied.com 15 IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
STEP 8: To complete the installation, add the appropriate
prelter latches to the prelter holding frame. Once latches
are installed, place the prelter in the frame, secure with the
latches and the installation is complete.
Repeat with all remaining prelters and frames.
Figure 33: Installation of Prelter into Frame
Figure 34: Completed Assembly

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MeChanICal InsTallaTIon
Duct Connections
Use exible connectors on the outlet and inlet duct connections
of all units. Do not position down ow fans over air ducts that
are routed down into the building. Use a discharge plenum
when bottom connections are necessary (Figure 34).
Support all ductwork independently of the unit or unit casing.
Figure 35: Discharge Plenum
If the unit has a section with a top opening, eld fabricate and
install ashing to seal out and divert any moisture away from
the opening, ductwork, or duct components attaching to the
opening. Install ashing so that it laps over the standing seams
of the unit roof panels and over the side edges of the unit
(Figure 34). Connect ductwork to the unit itself - do not connect
ductwork directly to the unit roof panel only. Seal the ductwork
to the opening, the unit itself, and to the unit roof panel to
prevent moisture intrusion into the unit or building.
NOTE: In certain cases, a full roof panel will be included
above top openings or top dampers. Field cut an
opening of the desired size taking care to avoid
damaging unit panels, anges, dampers, or any other
internal components while cutting. Roof panel(s) may
be removed to facilitate cutting, sealing, and ashing
connections but must be replaced and resealed in a
way that diverts moisture away from the opening and
connected ductwork. Ductwork must be sealed and
ashed to the opening, the unit itself, and to the unit
roof panel to prevent moisture intrusion into the unit
or building.
Figure 36: Suggested Flashing over Top Panels and Sides
of Units


Duct
Unit
Unit
Unit
Duct
Duct
Flashing
Flashing
Flashing
Standing Seam
Standing Seam
Unit Roof Panel
Unit Roof Panel
Field-Cut Opening

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www.DaikinApplied.com 17 IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
Dampers and Hoods
Side dampers may be provided in the mixing box and
economizer sections of units. When dampers are provided,
access to the damper drive shaft is recommended internally
through the upstream or downstream sections of the unit. If no
internal access is available, a removable panel is located above
the weather hood to provide access to the damper drive shaft.
NOTE: The hood and damper must be removed to remove
the panel. Other access may be available depending
on the specic construction of the unit (Figure 36).
Figure 37: Filler Panel Over the Weather Hood
When units are ordered with exhaust hoods and intake hoods
adjacent to each other, install a eld-supplied barrier to prevent
recirculation of exhaust air into the intake openings. (Figure
37).
Figure 38: Field-Installed Barrier Between Hoods
Mounting Actuators
CAUTION
Maximum damper rotation is 70°. Maximum shaft torque is
205 inches/pound. Greater rotation or torque can cause
equipment damage.
The installing contractor is responsible for the mounting of
all eld-installed actuators. No provisions are made for the
location of these actuators due to the number of options and
arrangements available and the variety of specic applications.
Typically, actuators are mounted inside the cabinet. Provide
proper support for the actuator to avoid excessive stress in the
cabinet, linkage, or damper shafts.
EXCEPTION: For the angled economizer, the fresh air
and return air dampers must always be driven by separate
actuators.
NOTE: Damper blades are at full ow when open to 70
degrees. Do not open blades further than 70 degrees.
Fresh air and return air dampers can be linked together and
driven from the same actuator if the dampers are the same
size. If the dampers are different sizes, they must be driven
by separate actuators and controlled appropriately. Exhaust
dampers are always driven by a separate actuator.
A typical rotary electric actuator can handle up to 40 sq. ft. of
damper. For pneumatic actuators, allow 5 in-lb per square foot
of damper area.
Angled Economizer Actuator
Access
Access to the fresh air and exhaust air damper drive shafts
of the angled economizer is recommended internally through
the upstream or downstream sections of the unit. If no internal
access is available, a removable ller panel is located above
the weather hood to provide access to the damper drive shaft.
NOTE: The hood and damper must be removed to remove
the panel. (Figure 36) There are two options for
gaining access to the return air damper drive shaft:
1. If the unit has a housed return fan or plenum exhaust
fan, an access section should be located immediately
downstream of the economizer section for access to the
return air damper drive shaft.
2. If the unit has a plenum return fan or housed exhaust
fan, access to the return air damper drive shaft can
be obtained via the fan section’s access door and the
removable ller panel located above the return air damper.
Roof Cap
Drip Edge
Filler Panel
Damper Hood
Remove Screws and
Filler Panel to Access
Damper Control Shaft

  
 

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MeChanICal InsTallaTIon
Face and Bypass Section Mounting
Internal and external face and bypass sections are mounted
together using the instructions for horizontal components
and do not require additional instruction. Skyline air handlers
are provided with a bypass duct that is integral to the unit
construction and requires no eld assembly.
Face and bypass dampers may or may not be linked together.
When dampers are placed before a single bank of coils, they
always are linked together and require a single actuator. When
dampers bypass a stacked or staggered coil, the dampers are
not linked and require multiple actuators.
Face and bypass dampers have a torque requirement of 10
in-lbs per square foot of damper face area.
Isolation Dampers for Multiple Fans
Optional isolation dampers can be provided on multiple fans
to prevent backow through a fan that is turned off for service.
These isolation dampers are not intended to be used to control
ow through the fan. The isolation damper for a fan that is
going to be started must be positioned in the full open position
before the fan is started. Do not start a fan with the damper
located at the inlet with the damper fully or partially closed.
This can cause airow, vibration, and sound problems that can
lead to failure.
Isolation dampers can be provided with actuators that are
mounted in the airstream. Actuator sizing for the isolation
dampers should be based on 9 in-lb per square foot of damper.
Piping Vestibules
The Skyline air handler has 2 options for piping vestibules. The
curb ready base unit has a factory installed vestibule and the
unitized base option has a eld installed vestibule. See order
for details.
For units that include a piping vestibule, cut the openings for
routing the eld piping as required in the eld. Carefully seal
passages cut through the panels to prevent air leakage. A
single metal thickness pan is provided in the bottom of the
curb-mounted vestibule. The pan can be removed if necessary.
If holes are cut into the pan for a piping passage, seal the
holes to prevent moisture leakage (Figure 38).
Figure 39: Seal Holes for Piping—Curb Mounted Units
For units with standard base rails, the vestibule is open to the
coil section; therefore, seal all holes to prevent air leakage.
Figure 40: Seal Holes for Piping—Standard Base Rail Units
Seal holes
cut for piping
Seal holes
cut for piping

MeChanICal InsTallaTIon
www.DaikinApplied.com 19 IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
Field-Installed Vestibule
WARNING
Use all lifting points. Improper lifting can cause severe
personal injury and property damage.
CAUTION
Lifting points may not be symmetrical to the center of gravity
of the unit. Ballast or unequal cable lengths maybe required.
The unit can be shipped with an optional eld installed
vestibule. Vestibule will ship fully assembled on a separate
shipping pallet. Lifting lugs are located at the top of the
vestibule. Field installed vestibule is designed to mounted on a
Skyline roof curb. See IM 770 for curb installation details.
Field-Installed Vestibule Installation
The vestibule comes completely assembled from the factory.
1. Inspect the gasket and splice collar to ensure they are
secure and not damaged. Refer to Figure 40, Detail A.
2. Follow the instructions to attach rigging and lift the
vestibule vertically. Remove the shipping pallet.
3. Apply a continuous bead of caulking to the vertical ange
of the vestibule roof cap on the side that faces the unit
(Figure 41).
4. With the unit in position, lift the vestibule onto the
vestibule curb and align it as close as possible to its nal
position. Make sure not to damage the gasket on the
side of the unit. Refer to Figure 40, Detail A.
5. Use the crane and rigging to relieve the weight of the
vestibule, manually push and slide the vestibule next to
the unit.
6. Access the inside of the vestibule by opening the door or
removing the outer panel.
7. Use the supplied mounting screws to connect the
vestibule to the unit, screwing through the ange of the
vestibule and into the small binding holes of the splice
collar. See Figure 42.
8. Once the vestibule is secured to the unit, remove the
rigging and apply additional caulking to both corner
seams. See Figure 43.
Figure 41: Typical Vestibule
SHOWN
SPLICE COLLAR
DETAIL A

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MeChanICal InsTallaTIon
Figure 42: Caulking the Vestibule Roof Cap Figure 43: Detail of Mounting Screws
Figure 44: Additional Caulking
UNIT TO VESTIBULE SPLICE DETAIL
SCREW
SPLICE
COLLAR
UNIT