Daikin Vision Manual

Installation and Maintenance Manual IM 915-13
Group: Applied Air Systems
Part Number: IM 915-13
Date: June 2023
Vision®Air Handler – Extended Sizes
Sizes 107—169

IM 915-13 • VISION - EXTENDED SIZES 2 www.DaikinApplied.com
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
General Information ..........................3
Receiving and Handling .......................3
Unit Storage ................................4
Gas Furnace ................................4
Installation Guidelines ........................5
Service Clearances ..........................5
Rigging ....................................6
Unit Leveling ...............................7
Assembling Sections .........................7
HEPA Holding Frame, Filter, and Prelter Installation12
Piping and Coils ............................16
Internal Fan Isolation Assembly Adjustment ......21
Electrical Installation .........................23
Wiring ....................................23
Operation Guidelines ........................24
Startup Checks .............................24
Daikin Applied Fan Array ......................28
 ...................32
Fan Operating Limits ........................38
Fan Vibration Levels .........................39
Sorbent Ventilation Technology ................40
Service and Maintenance . . . . . . . . . . . . . . . . . . . . . 41
Periodic Service and Maintenance ..............41
Front Load Filter Option ......................43
Warranty ...................................48
Equipment Warranty Registration Form .........49
Quality Assurance Survey Report ..............54
©2023 Daikin Applied, Minneapolis, MN. All rights reserved throughout the world.This document contains the most current product information as
of this printing. Daikin Applied Americas Inc. has the right to change the information, design, and construction of the product represented within the
document without prior notice. For the most up-to-date product information, please go to www.DaikinApplied.com.
™® Vision, MicroTech, SiteLine, and Daikin Applied are trademarks or registered trademarks of Daikin Applied Americas Inc. The following are
trademarks or registered trademarks of their respective companies: BACnet from American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc.; Echelon, LonWorks, LonMark, and LonTalk from Echelon Corporation; Modbus from Schneider Electric; and Windows from
Microsoft Corporation.


www.DaikinApplied.com 3 IM 915-13 • VISION - EXTENDED SIZES
General Information
Vision air handlers are not designed to be weather resistant.
Do not install them outdoors.
The system design and installation must follow accepted
industry practice as described in the ASHRAE Handbook, the
National Electric Code, and other applicable standards. This
equipment must be installed 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, clips, and other comparable items
inherently have sharp edges. The installer and maintenance
personnel should exercise caution.

Sharp edges and coil surfaces are a potential injury hazard.
Avoid contact.
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 will ship on separate skid(s).
• Hardware (screws, bolts, etc.) for assembling sections
are supplied in a bag attached to each section. All
necessary gasketing is applied in the factory for section-
to-section mounting. NOTE: A special #30 Torx bit is
required for assembly.

• 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
• Vision 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.
• Handle the zone damper of the multi-zone units with
special care. Zone dampers are set and inspected before
leaving the factory but should be checked on arrival to the
job to verify the bell arm and connecting rod set screws
did not become loose in shipment.

CAH 169 G D A C
Model
CAH = Custom modular air handler
CAC = Custom modular component

(cataloged size—nominal square foot of coil)
107, 124, 141, 160, 169
Vintage of Daikin Applied air handling unit
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B = Blow-through cooling coil location
D = Draw-through cooling coil location
H = Heating only
V = Vent only
M = Multizone

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
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 915-13 • VISION - EXTENDED SIZES 4 www.DaikinApplied.com
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
• 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 o󰀨 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
di󰀨erent 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 di󰀨erent 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 43.
Gas Furnace
For installation and maintenence information related to gas
heat, refer to IM 1300.

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www.DaikinApplied.com 5 IM 915-13 • VISION - EXTENDED SIZES
Installation Guidelines

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 su󰀩cient space—at least equal to the
length of the coil—on the side of the unit for shaft removal and
coil removal. Space, at least equal to the length of the side
coil, is required for coil removal. Space, at least equal to the
n height, is required for top coil removal. See Figure 1 for
servicing space requirements.
For routine maintenance purposes, access is normally
obtained through the access doors or by removing panels.
Fan and lter sections are always provided with a service door
on one side of the unit. If requested, 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.
If component replacement is required, the top panel also
can be removed. If necessary, the unit can be disassembled.
Maintain at least 54” of clearance in front of electrical power
devices (starters, VFDs, disconnect switches and combination
devices). Electrical power devices that are mounted on the
side of the unit typically are up to 12” deep. See 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
 

 
  

  
     





IM 915-13 • VISION - EXTENDED SIZES 6 www.DaikinApplied.com
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Rigging

A licensed and/or professional rigger is responsible for
developing a safe lift plan to meet local/national/international
codes.

Use all lifting points. Improper lifting can cause severe
personal injury, death or property damage.

ACCIDENT HAZARD. Do not forklift. Rig the unit only from
lifting points. Verify unit is secure before lift. Failure to comply
could result in personal injury or death.
Extended size Vision 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. Each section ships with a
factory installed base rail and must be lifted via the retractable
(or removable for ship sections less than 49”) lifting brackets
provided on each section (see Figure 3).
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 the unit.
A fan array or coil section might have a tall, thin aspect ratio.
The center of balance on these sections can be high and make
the section prone to tipping during the lift. Care should be
taken when lifting units with a tall, thin aspect ratio.
Rigging Instructions

DO NOT LIFT FROM 2” HOLES AT ENDS OF UNIT. Failure to
comply may result in personal injury or death.
Use proper sized shackles and hooks for rigging the unit. Rig
the unit according to the instructions listed below and connect
to lifting points as shown in Figure 3.
1. The unit must be rigged as it ships from the factory. Do
not rig units after assembly. The 2” holes at the end of
the unit are for tie down purposes only. Do not lift from
these points. See lifting points in “Figure A” and “Figure
B” (Figure 3).
2. The spreader bar length must be equal to (or no greater
than a foot longer than) the shortest dimension (width or
length) of the unit. Install the spreader bar parallel to the
shortest dimension.
3. On narrow sections, the lifting brackets will already be
exposed. For wide sections, the lifting brackets need to
be extended. To do this, cut the wire-tie which is holding
the bracket and retaining pin. Pull the bracket until the
retaining pin hole is exposed. Slide the retaining pin into
the hole and secure it with the provided spring clip and
washers. See details in “Figure B” (Figure 3).
4. Fasten four separate cables to each of the four lifting
brackets extending from the middle of the section. Use
long enough cables so that the angle between the cables
and the ground is a minimum of 60º.
5. To attach rigging equipment, the large lifting bracket
bolt may need to be removed. Clevises or rigging hooks
can be used by attaching them around the provided bolt.
Examples of proper connections are shown in “Figure C”
(Figure 3).
6. Before hoisting into position, test lift for stability and
balance. Adjust cable lengths to avoid uneven lifting of
unit.
Figure 3: Units on Base Rails

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www.DaikinApplied.com 7 IM 915-13 • VISION - EXTENDED SIZES

Place the equipment on a at and level surface. Where the
surface irregularities could cause the equipment to distort, use
a shim so the base of the unit follows a straight line. Uneven or
distorted sections cause mist or binding of the doors, panels,
and improper draining of drain pans.
Units over 108” wide must rest on a at surface for the entire
width of the base rails, or must be shimmed at one or more
points along the length of the rails to prevent distortion or
sagging of the support rails (Figure 4).
Figure 4: Leveling the Unit
Assembling Sections
Extended size units ship as separate shipping sections for eld
assembly. 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. Note: Some sections are shipped with shipping
braces.These need to be removed before connecting the
shipping sections. (Figure 5)
Figure 5: Shipping Braces

1. Rig the section into position and line shipping sections up
in the direction of airow. Each section is clearly marked
as to the order of assembly.
2. As the sections are set in place, the holding pins must be
removed from the retractable/removable lifting brackets.
Once the pins are removed, the retractable lifting
brackets can be easily tucked into the base rail and/or
the removable lifting brackets can be removed, allowing
the mating section to seat rmly against the adjoining
section.
3. Pull sections together to fasten. Use a furniture clamp (or
straps) and a ratchet to help pull the sections together
securely at the top and bottom.
4. The unit has a factory-installed base rail. Fasten the
base rails together using the 3/8”-16 × 5” bolts located in
the splice kit provided with the unit.
a. To fasten two shipping sections together, four bolts
are needed (two on each side of the unit). The
bolts run from one base rail into the other and are
fastened with a nut. Complete each bottom/top
section before attaching additional sections.
5. Once the sections are positioned together, additional
section-to-section straps must be secured.
a. Remove the at head Torx 30 fastener located in
each of the top channel corners (on the mating
edges in the channel piece).
b. Mount the joining strap (shorter strap found in the
splice kit, see Figure 66), over the two coned holes
in the channels and refasten the at head Torx 30
fasteners through the joining plate.
6. Locate and remove the panel screws on each side of
the air handler top panel, as close to the center of each
panel (of each half) as possible. Secure the mounting
straps (longer strap found in the splice kit) as shown in
Figure 8.
 
   
  
  
    
 

IM 915-13 • VISION - EXTENDED SIZES 8 www.DaikinApplied.com
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6. For certain high pressure, low leakage units, use
the provided section joining plates to fasten sections
together. Space them as shown in Figure 6. 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.
Figure 6: Horizontal Joining Sections
Figure 7: Frame Channel Stiener Plates (High Pressure,
Low Leakage Units Only)
Figure 8: Horizontal Joining Sections (Base Rail)
For positive pressure sections (sections located after the
supply fan), a base rail join piece needs to be installed to
provide a good seal in the bottom of the air handler.
1. Adjust the base rail clip bolts to t over the adjoining
base rail anges (loose enough for the piece to slide and
yet tight enough to provide a good seal). See Figure 8.
2. Push the clip with a long narrow board or broom handle
(something half the width of the unit) to the center of
the air handler top panel, as close to the center of each
panel (of each half) as possible. Secure the mounting
straps (longer strap found in the splice kit) as shown in
Figure 8.
For high pressure, low leakage units, ensure that the D-gasket
is attached to the entering air side frame channel (Figure 9). If
it has dislodged during shipping, restore to original location.
Figure 9: D-Gasket Placement Detail (High Pressure, Low
Leakage Units only)
Top
Bottom with Base Rail
Top
Bottom with base rail
.22
Base rail clip
Mounting strap

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www.DaikinApplied.com 9 IM 915-13 • VISION - EXTENDED SIZES
Internal Section-to-Section Mounting
If desired, shipping sections can be fastened together
internally. To fasten internally, run eld-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.
A section-to-section splice joint provided seals against the
frame channel on the entering-air side of the adjoining section.
Align the splice joint to seat into the mating gasket to provide
an air seal. If the splice joint was bent during shipping or
Figure 10: Internal Fastening

Panel Removal
To remove a side or top panel, remove the at head Torx 30
fasteners along the sides of the panel. Lift o󰀨 the panel after
removing all fasteners.
Figure 11: Removing Panel Screws
Frame Channel Removal
Top frame channels that run the length of the unit 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 o󰀨, remove the at head Torx 30 fasteners in
the corner of the frame channels and pull the frame channel
out the side. Remove any panel screws that are within 1” of the
of the frame, since they are engaged into the gasketed ange
of the frame. See Figure 11.
Fan Section Doors

Sharp edges and coil surfaces are a potential injury hazard.
Avoid contact with them.
 Opening fan section doors requires using a 17 mm
socket wrench (Figure 12), which satises ANSI
standards and other codes that require the “use of
tools” to access compartments containing moving
parts or electrical wiring.
 

  

  
Remove panel
to remove frame
Remove any
panel screws that
engage frame

IM 915-13 • VISION - EXTENDED SIZES 10 www.DaikinApplied.com
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1. Insert 17 mm socket and rotate 1/4 turn clockwise as
shown in Figure 12. If the handle is on the left side of the
door, rotate 1/4 turn counterclockwise.
2. Rotate the door handle 1/4 turn clockwise and then 1/4
turn counterclockwise to release any internal pressure
or vacuum and open the door. If the handle is on the
left side of the door, rotate the door handle 1/4 turn
counterclockwise and then 1/4 turn clockwise.
3. To prevent air leakage, tighten the door panels by
adjusting the jam nuts.
Figure 12: Opening Fan Section Door
Injected-Foam Insulated Panels

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.
 Panel
damage can occur.
Vision air handlers 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. Use caution when cutting and sealing all eld-cut
openings in these panels.
Panel Cutting Procedure
1. Determine the number and location of holes required for
electrical conduit, piping, and control wiring as follows:
—Check that adequate space is available inside the unit
for conduit or pipe routing.
—Do not locate holes in a panel that provides access to
key maintenance components such as lters and fan
assemblies.
—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. 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 that it is airtight,
watertight, and so that there is NO EXPOSED FOAM
INSULATION. .
Figure 13: Cutting/Sealing Injected-Foam Insulated panels
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.


www.DaikinApplied.com 11 IM 915-13 • VISION - EXTENDED SIZES
Field Mounting Junction Boxes and


Do not use self-tapping drill screws. They will not tighten nor
secure properly and panel damage can occur.
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.
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.
For eld mounting junction boxes with conduit, always seal
conduit with electrical conduit sealant.
The unit frame channel is another excellent location for
securing heavier components. Self-tapping screws are not
acceptable; use through-bolts with at washers and seal.
Check that the location permits the full operation of all access
doors and panels and does not interfere with other vital
components.
External Face and Bypass Duct
Assembly
When extended size units are ordered with external face
and bypass, the bypass duct ships separately and must be
attached to the unit in the eld. The joining of the bypass duct
assembly to the unit must be done after the unit is assembled.
The eld assembly of the bypass duct to the unit requires the
following steps (also refer to Figure 14):
1. Position the unit shipping sections together and
assemble in the equipment room.
2. After the unit is assembled, lift the duct into position over
the unit. Joining collars are shipped factory assembled
to the unit and duct. There is a joining collar located in
the top of the bypass opening and in the leaving air side
of the bypass duct. These joining collars are used to
provide air seals. Line up the duct with the top openings
in the unit.
3. Place the duct assembly that has the joining collar on
the bottom, onto the top of the unit. Once it is in place,
position the other duct assembly. Use caution and t the
splice collar into the rst duct assembly, and then lower
the other end into the bypass opening.
4. Once the duct is positioned correctly, fasten the duct
pieces together with the joining collar provided. To do
this, remove the fasteners located in the corners of the
duct assemblies, place the collar over the holes in the
corners, and then replace the fasteners. See Figure 6 on
page 8.
Figure 14: Assembly of Bypass Duct to Unit

  
  
  

IM 915-13 • VISION - EXTENDED SIZES 12 www.DaikinApplied.com
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HEPA Holding Frame, Filter, and

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 su󰀩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
Figure 15: Leg Extensions and Latches without Prelters
Figure 16: Leg Extensions and Latches with 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
17, then pull back on the leg extension locking it into place
(Figure 18).
Repeat Step 1 with each of the 4 corners. The frame with leg
extensions should look like Figure 19.
Figure 17: Place Leg Extension over the Frame Tabs
Figure 18: 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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www.DaikinApplied.com 13 IM 915-13 • VISION - EXTENDED SIZES
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 20.
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 21).
Figure 19: Frame with Leg Extensions Installed
Figure 20: 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 22. 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 23. Repeat this step
with all 4 corners.
Figure 21: Filter Placed Inside of Frame
Figure 22: Latch Overlapping Leg Extension
Figure 23: Tighten Cap Screw to 1/4”of the Coupling

IM 915-13 • VISION - EXTENDED SIZES 14 www.DaikinApplied.com

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 24.
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 24: Tighten until Latch and Coupling Meet
Figure 25: Properly Installed Filter Inside of the Frame

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 26.
Figure 26: 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 27.
Tighten the cap screw until there is an approximately 1/4” gap
between the latch and the leg extension coupling as shown in
Figure 28. 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 29.
Figure 27: Latch Positioning for Prelter Frame


www.DaikinApplied.com 15 IM 915-13 • VISION - EXTENDED SIZES
Figure 28: Tighten Cap Screw to 1/4”of the Coupling
Figure 29: 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 30: Properly Installed HEPA Filter
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 31: Installation of Prelter into Frame
Figure 32: Completed Assembly

IM 915-13 • VISION - EXTENDED SIZES 16 www.DaikinApplied.com

Mounting Actuators

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.
Fresh air and return air dampers can be linked together for
each half and driven from the same actuator if the dampers
are the same size. If the dampers are di󰀨erent sizes, they must
be driven by separate actuators and controlled appropriately.
Exhaust dampers are always driven by a separate actuators.
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.

Requirements
The dampers are not linked and require multiple actuators -
four for the face dampers and two for the bypass dampers.
A damper shaft extension is provided. Normally, the shaft
extension is located on the drive side of the unit, but it can be
moved to the other side.
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 o󰀨 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.

When designing and installing piping:
• Follow applicable piping design, sizing, and installation
information in ASHRAE handbooks.
• Observe all local codes and industry standards.
• Do not apply undue stress at the connection to coil
headers; always use a backup pipe wrench.
• Support pipework independently of the coils.

• Water supply, water return, drain, and vent connections
extend through the end panel of the coil section. All
connections are labeled on the end panel.
• Water supply and water return connections are typically
male NPT iron pipe.
• When installing couplings, do not apply undue stress
to the connection extending through unit panel. Use a
backup pipe wrench to avoid breaking the weld between
coil connection and header.
• Follow recommendations of the control manufacturer
regarding types, sizing, and installation of controls.

• The coil distributor and suction connection extend through
the end panel of the coil section.
• Check nozzle in distributor for proper tonnage.
• When a eld supplied thermostatic expansion valve is
used, it is located outside the unit and connected directly
to the distributor. Do not apply heat to the body of the
expansion valve.
• The thermostatic expansion valve must be of the external
equalizer tube type. Connect the 1/4-inch diameter
external equalizer tube provided on the coil to connection
on expansion valve.
• Use care when piping the system to see that all joints
are tight and all lines are dry and free of foreign
material. For typical refrigerant piping, see condensing
unit product manual.


www.DaikinApplied.com 17 IM 915-13 • VISION - EXTENDED SIZES

Piping
(see Figure 33 on page 19)
• All steam coils in units are pitched toward return
connection.
• Steam supply and steam return connections typically are
male NPT iron pipe and are labeled on the end panel of
coil section. Connections extend through the coil section
end panel.
• When installing couplings, do not apply undue stress
to the connection extending through unit panel. Use a
backup pipe wrench to avoid breaking the weld between
coil connection and header.
• Support piping independently of coils and provide
adequate piping exibility. Stresses resulting from
expansion of closely coupled piping can cause serious
damage.
• Do not reduce pipe size at the coil return connection.
Carry return connection size through the dirt pocket,
making the reduction at the branch leading to the trap.
Coils
• Install vacuum breakers on all application to prevent
retaining condensate in the coil. Generally, the vacuum
breaker is connected between the coil inlet and the
return main. The vacuum breaker should be open to the
atmosphere, and the trap design should allow venting of
large quantities of air.
• Do not drip supply mains through the coil.
• Do not attempt to lift condensate when using modulating
or ON/OFF control.
Traps
• Size traps in accordance with the manufacturers’
recommendations. Make sure that the required pressure
di󰀨erential is always available. Do not undersize.
• Use oat and thermostatic or bucket traps for low
pressure steam. On high pressure steam, use bucket
traps. Use thermostatic traps only for air venting.
• Use bucket traps for ON/OFF control only.
• Locate traps at least 12 inches below the coil return
connection.
• Multiple coil installation:
• Individually trap each coil or group of coils that is
controlled individually trapped.
• Coils in series—use separate traps for each coil, or bank
of coils.
• Coils in parallel—a single trap can be used, but an
individual trap for each coil is preferred.
• Do not attempt to lift condensate when using modulating
or ON/OFF control.
• With coils arranged for series airow, use a separate
control on each bank or coil in the direction of airow.
Valves
• Do not use modulating steam valves on high pressure
systems.
• Properly size modulating valves. Do not undersize.
• Freezing conditions (entering air temperatures below
35°F).
—Daikin Applied strongly recommends 5JA, 8JA, 5RA
and 8RA coils.
—Supply 5 psi steam to coils at all times.
• Do not use modulating valves. Provide control by face
and bypass dampers:
—Consider using two or three coils in series with two
position steam control valves on the coil or coils that
handle 35°F or colder air. Use a modulating valve on
the downstream coil to provide the desired degree of
control.
—Thoroughly mix fresh air and return air before it enters
the coil. Also, to obtain true air mixture temperatures,
properly locate temperature control elements.
—For additional protection against freeze-up, install the
trap su󰀩ciently below the coil to provide an adequate
hydrostatic head to remove condensate during an
interruption in the steam pressure. Estimate three feet
for each 1 psi of trap di󰀨erential required.
—On startup, admit steam to coil ten minutes before
admitting outdoor air.
—Close fresh air dampers if steam supply pressure falls
below the minimum specied.

IM 915-13 • VISION - EXTENDED SIZES 18 www.DaikinApplied.com


Follow these guidelines when routing eld supplied internal
piping through the bottom of a unit.
• Determine what style base and options were selected:
—Was an uninsulated sheet metal pipe chase cover
selected?
• Determine the number and location of holes required for
piping as follows:
—Check that adequate space is available inside the unit
for pipe routing.
—Hole(s) must be located fully within panels or sheet
metal opening covers. Do not run pipes through 4”
wide intermediate panels or on the very edge of the
panel.
—Do not place holes in a location that impedes access
to key maintenance components such as lters and
fan assemblies.
—Do not place holes in a location where the pipe will
block airow or obstruct hinged access doors.
• Once a proper location is determined:
—If no pipe chase cover is present:
a. Drill a small pilot hole completely through the
bottom cabinet panel, then using a sharp hole saw
or saber saw, cut the desired nal hole size and
smooth the edges of the cut. or saber saw, cut the
desired nal hole size and smooth the edges of the
cut.
—If a pipe chase cover is present:
a. Remove the pipe chase cover.
b. Drill a small pilot hole completely through the pipe
chase cover, then using a sharp hole saw or saber
saw, cut the desired nal hole size and smooth the
edges of the cut.
—After installation of the piping, seal the hole(s) in the
bottom cabinet panel or pipe chase cover.
a. Seal the holes to divert any moisture away from
the opening and prevent moisture leakage through
the holes.
b. Recommended sealing options include: ashing
material, caulk, spray foam, cork tape, industrial
or commercial grade silicone sealant, duct seal
compound, or other similar sealing material.
c. Pipe chase covers are not guaranteed to be
airtight or watertight, but the pipe chase cover
may be sealed in a similar manner to the other
penetrations of the pipe chase cover if desired.
 The installer is responsible for ensuring the
penetrations are fully sealed.
 Do not support piping o󰀨 of the unit, or coil
connections.
 It is extremely important to seal each hole or
penetration securely so that they are airtight and
watertight.


www.DaikinApplied.com 19 IM 915-13 • VISION - EXTENDED SIZES
Figure 33: Piping Arrangements
Check Valve Strainer Gate Valve
Control valve
modulating
two position
Float and
thermostatic trap
High Pressure (over 25 psi)
Low Pressure (to 25 psi)
5GA or 8GA coils. Note that the
addition of a vacuum breaker to
permit the coil to drain during
shutdown.
5TA, 8TA, or 5HA coils. Conden-
sate is lifted to overhead return
main
5JA or 8JA coil.Installed in series.
Note that each coil must have a
separate control valve and trap.
5RA, 8RA, or 5SA coils. Banked two
high, individual trapping of each coil as
shown is preferred.
5RA, 8RA, or 5SA coils. Installed
5J, 5G, 8J or 8G coils.

IM 915-13 • VISION - EXTENDED SIZES 20 www.DaikinApplied.com



Improper installation, use, or maintenance of water heating
coils can cause equipment damage. Read and follow
instructions carefully.
• Water supply and water return connections extend
through the end panel of the coil section. All connections
are labeled on the end panel.
• Water supply and water return connections are male NPT
iron pipe.
• When installing couplings, do not apply undue stress
to the connection extending through unit panel. Use a
backup pipe wrench to avoid breaking the weld between
the coil connection and header.
• Follow recommendations of the control manufacturer
regarding types, sizes, and installation of controls.
• Do not use hot water coils with entering air below 40°F.
• If fresh air and return air are to be heated by a hot water
coil, carefully design the system to provide thorough
mixing before air enters the coil.
• To prepare coils for winter operation, see See Removing
and Replacing Components on page 45.
Drain Pan Traps
Run drain lines and traps full size from the drain pan
connection. Install drain pan trap to allow condensate to drain
freely. On both blow-through and draw-through units, the trap
depth and the distance between the trap outlet and the drain
pan outlet must be twice the static pressure in the drain pan
section under normal operation so the trap remains sealed.
See Figure 34.
Figure 34: Allow Adequate Distance Between Trap Outlet
and Drain Pan Outlet
Pressure (P)
at the drain pan
2P
2P