Daikin Destiny VFD Series Manual

Installation and Maintenance Manual IM 782-12
Group: Applied Air Systems
Part Number: IM 782
Date: August 2019
Destiny®Indoor Air Handler
Sizes 002 through 030
Vertical Model
Horizontal Model

IM 782-12 • DESTINY AIR HANDLERS 2 www.DaikinApplied.com


Introduction..................................3
Hazardous Information Messages ...............3
Smoke Control and Management Systems ........3
Installation...................................4
Receiving and Handling .......................4
Storing the Unit .............................4
Attaching the Mixing Box ......................5
Service Clearances ...........................6
Rigging ....................................7
Unit Leveling ................................7
Panels and Doors ............................8
Panel Removal.............................8
Actuators ...................................8
Installing Damper Actuator....................9
Reversing the Coil Handing ...................10
Reversing the Belt Drive Package ..............12
Hanging the Unit from a Ceiling ................12
Piping and Coils ............................13
Water Cooling Coils ........................13
Direct Expansion Coils......................13
Steam Coils................................14
Water Heating Coils .........................15
Drain Pan Traps ............................15
Internal Isolation Assembly Adjustment...........16
Spring Mount Adjustments—Twin Fan Units .....16
Electric Heat Section.........................17
Field Power Wiring ..........................21
Variable Frequency Drive (VFD) ................22
Starters and Disconnects .....................22
(Optional) ...............................22
Wiring Diagrams.............................23
Electric Heat Diagrams .......................23
Disconnect-Only Diagrams ....................24
VFD Diagrams .............................25
Physical Data ...............................27
Component and Section Weights ...............27
Fan Data .................................30
Filter Data .................................30
Coil Data .................................31
Drain Pan Data .............................32
Electric Heat Data ..........................32
Fan Curves ................................33
Dimensional Data ............................38
Cabinet Dimensions—Horizontal ...............38
Cabinet Dimensions—Vertical..................40
Mixing Box Dimensions.......................41
Electric Heat Dimensions—Left/Right Oriented ....42
Control Box Dimensions ......................43
Operation Guidelines .........................44
Startup Checks .............................44
Before Starting the Unit .....................44
Operating Limits ............................45
Fan Vibration Levels .........................45
Service and Maintenance......................46
Periodic Service and Maintenance ..............46
Ball Bearing Lubrication .....................46
Fan Drive Adjustments .......................47
VM and VP Variable Pitch Key Type Sheaves ....47
LVP Variable Speed Sheaves ................48
MVP Variable Speed Sheaves ...............49
Fan Drive Belt Adjustment ...................50
Coil Maintenance ...........................52
Component Removal and Replacement ........52
Warranty ...................................53
Warranty Details ..........................53
Warranty Return Material Procedure ..........53
Replacement Parts ........................53
Destiny Equipment Warranty Registration .......54
Quality Assurance Survey .....................59


www.DaikinApplied.com 3 IM 782-12 • DESTINY AIR HANDLERS

Hazardous Information Messages

Cautions indicate potentially hazardous situations, which can result in
personal injury or equipment damage if not avoided.

Warnings indicate potentially hazardous situations, which can result in
property damage, severe personal injury, or death if not avoided.

Dangers indicate a hazardous situation which will result in death or serious
injury if not avoided.

Notices give important information concerning a process, procedure,
special handling or equipment attributes.

Improper installation maintenance can cause equipment damage or
personal injury.
Installation and maintenance must be performed by qualied personnel
familiar with applicable codes and regulations, and experienced with this
type of equipment.

Destiny units are not designed to be weather resistant; DO NOT install
outdoors.

Improper ground may result in severe injury or death.
Check grounding nut tightness before connecting power to the external
junction box.

Fan motor require load protection.
Failure to provide overload protection can result in re, property damage,
electric shock, personal injury or death. Connect motor to an overload
protective device rated in compliance with local electric codes.

Systems

Improper smoke or fume air handling can result in severe personal
injury or death.
A registered professional engineer must design and approve the air
conditioner and air handler application to make sure smoke and fume
control meet local re codes and NFPA requirements for the specic
building application. Due to the wide variation in building design and
ambient operating conditions into which our products can be applied,
we do not represent or warrant that our products will be t and sufcient
for smoke and fume control and management purposes. The owner and
building designer must consult a registered professional engineer to satisfy
themselves in this regard.
The system design and installation must follow accepted
industry practice, such as described in the ASHRAE
Handbook, the National Electric Code, and other applicable
standards. The installation of this equipment must be in
accordance with regulations of authorities having jurisdiction
and all applicable codes. It is the responsibility of the installer
to determine and follow the applicable codes.

IM 782-12 • DESTINY AIR HANDLERS 4 www.DaikinApplied.com


Receiving and Handling
1. Carefully check items against the bills of lading to verify
all crates and cartons were received. Carefully inspect
all units for damage when received. Report visible and
concealed damage immediately to the carrier and a le a
claim for damage.
2. Destiny air handler units are thoroughly inspected before
leaving the factory. Install units carefully to prevent
damage.
3. Leave enough space around the unit for proper
maintenance, lter removal, lubrication, belt adjustment,
and removal of coils, if necessary (refer to Figure 2 on
page 6 for service clearances).
4. Use exible connections on the inlet and outlet duct
connections of the unit.
5. For 002–010 sized ceiling hung units, spring isolation of
the cabinet is recommended.
6. All fans are dynamically balanced before leaving the
factory. Carefully inspect fans for rough handling that can
cause misalignment or a damaged shaft.
7. Adequately pitch and trap drain line from drain pan
connection.

Store unit on a level surface. If air handling units are to be
stored for any period of time, it is important to rotate the
fan wheel (quarterly, as a minimum) to prevent permanent
distortion of drive components. Keep the fan bearings
lubricated. Grease may settle in the lower part of the bearing,
which may lead to oxidation on the upper portion of the bearing
surface.
Store units indoors in a clean, dry environment on a level
surface. Moisture, debris, and minerals can cause permanent
damage to the cabinet and components. Do not allow
coverings to trap moisture on the galvanized surface.


www.DaikinApplied.com 5 IM 782-12 • DESTINY AIR HANDLERS
Attaching the Mixing Box
Mixing boxes ship with Destiny units as a eld-installed option.
Attach the mixing box to the intake end of the air handler using
cleats included with the mixing box section. Install the cleats
into the interior mounting frames, with the hardware included
as shown in Figure 1.
Figure 1: Mixing Box Installation
Cleat locations
Cleat
installation
Cleat locations
(sizes 015 and above)

IM 782-12 • DESTINY AIR HANDLERS 6 www.DaikinApplied.com


Leave adequate space around the unit for piping, coils, and
drains. Always have access to at least one side of the unit for
regular service and maintenance. See Figure 2 for servicing
space requirements. Routine maintenance examples include
lter replacement, drain pan inspection and cleaning, fan
bearing lubrication, and belt adjustment. Provide su󰀩cient
space on the drive side of the fan and the connection side of
the coil for shaft and coil removal, if necessary (refer to the
“Coil Data” section in Catalog 580 for information about coil
sizes). Both the fan drive and coil can be eld modied to
right or left hand to accommodate clearance restrictions. See
Reversing the Coil Handing on page 10 and Reversing the
Belt Drive Package on page 12.
For routine maintenance, remove panels on either side of the
unit. See Panel Removal on page 8. Optional service doors
are available for the fan and lter sections. Allow su󰀩cient
space for service door(s) to swing completely open, or to
meet the clearance requirement of the section it accesses,
whichever is greater. Service doors are not interchangeable
with access panels on the opposite side of the unit. Determine
clearances before specifying doors.
Have at least 42" 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 6" deep, 12" maximum (see Figure 2).
Figure 2: Servicing Space Requirements
Width
Top view
Width of
fan section Width of
C oil section
30.00”
Width
Height
Vertical unit
Height
Horizontal unit
For Bottom Filter Access Only
Provide 30
Filter Removal
" Vertical Clearance for
Width
Vertical unit
Electric power clearance
42" 12"
(maximum)
Wall
Wall
Wall
42"
42"
Horizontal unit


www.DaikinApplied.com 7 IM 782-12 • DESTINY AIR HANDLERS
Rigging
Rig units using straps or a sling. Fasten strapping under the
skid that ships with the section. If a eld-installed mixing box is
attached, adjust to balance the unit properly.
To avoid damage to the unit cabinetry, use spreader bars.
Position spreader bars to keep cables from rubbing the frame,
connections, or panels. Before hoisting into position, test lift for
stability and balance. Avoid twisting or uneven lifting of the unit.
Figure 3: Rigged Unit on Skids

Place the equipment on a at and level surface (or verify
that unit is level when hanging from the ceiling). Where the
surface irregularities allow the equipment to distort, shim
the base of the unit to a straight line. Distorted units can
cause mist or binding of the doors and panels and improper
draining of drain pans.
Figure 4: Leveling the Unit
Vertical unit
Horizontal unit
Vertical unit
Shim
Horizontal unit
Shim

supported only at the unit’s


a level surface so that the unit


IM 782-12 • DESTINY AIR HANDLERS 8 www.DaikinApplied.com

Panels and Doors

Hazardous moving parts, high static pressure, and/or high voltage. Can
cause severe injury or death. Disconnect and lock ALL electric power OFF
before entering or servicing unit. Unit may employ multiple power supplies
and/or remote disconnects.
Secure drive sheaves to prevent motors and fan from free wheeling.
When leaving the unit, use screw or door handle locking mechanism
provided to secure access panel closed and prevent unintentional entry.
Panel Removal
Destiny air handlers have pocket pull handles in alternate
sections that allow side panels to be easily removed and
handled. To gain access through a side panel, remove the
fasteners along the sides of the panel and lift the panel o󰀨 using
the pocket pull handle. If the panel you are accessing does not
have a pocket pull handle, remove an adjoining panel with a
pocket pull handle and push the panel out from inside the unit.
Fan Section Doors
1. Use a at head screwdriver and rotate the screw 1/4 turn
as shown in Figure 6.
2. Rotate door handle 1/4 turn and open the door.
Figure 5: Panel Removal
Figure 6: Fan Section Doors
Actuators

Maximum damper rotation is 70°. Maximum shaft torque is 205 in.-lb.
Greater rotation or torque can cause equipment damage.
The factory-mounted actuator has been initially adjusted in
the factory. Power and control wiring, as well as ne-tuning
adjustment, is to be performed in the eld.
The installing contractor is responsible for the mounting of all
eld-installed actuators. An actuator mounting plate is provided
on the shaft side of the damper frame to accommodate
many actuators. However, due to the number of options, size
variations, and arrangements available, some actuators may
require alternate eld provided mounting hardware. 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 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.
A typical rotary electric actuator can handle up to 40 square
feet of damper. For pneumatic actuators, allow 5 in.-lb. per
square foot of damper area.
For good air ow control, adjust the linkage so that the damper
blades do not open beyond 70°. Opening a damper blade
beyond 70° will have little e󰀨ect on unit performance.
Do not “over-close” the low-leak damper blades as the blades
may lock up if the accompanying seal goes over the center of
the adjoining blade. Instead, close the damper blades until the
edge seal just lightly contacts the adjoining blade.
Figure 7: Factory Mounted Actuator


www.DaikinApplied.com 9 IM 782-12 • DESTINY AIR HANDLERS
Installing Damper Actuator
1. Turn the damper shaft until the blades are fully closed.
2. Place the actuator’s universal clamp over the damper
shaft (Figure 8). Make sure that the controls on the
actuator cover are accessible. Place the actuator in the
desired mounting position.
3. Disengage the actuator gear train by pressing the
manual override button (Figure 9) and rotate the clamp
until centered.
4. Slide the anti-rotation strap (Figure 9) under the actuator
so it engages the actuator at the center of the actuator
cut out (located on the back side). Bend the bracket as
needed to support the back side of the actuator. Secure
the strap/actuator to ductwork with self-tapping screws
(#8 recommended).
5. Loosen the nuts on the universal clamp. Press the
manual override button and rotate the clamp to about
5° (Figure 10) from the closed position (1/16" to 1/8"
between stop and clamp).
6. Tighten the two nuts on the universal clamp with a wrench.
Figure 8: Actuator on Damper Shaft
Figure 9: Actuator Manual Override Button and Strap
Figure 10: Actuator Universal Clamp Rotation

IM 782-12 • DESTINY AIR HANDLERS 10 www.DaikinApplied.com



Sharp edges and coil surfaces can cause personal injury. Avoid contact
with them.
Destiny coils universal-hand and coil connections can be
switched to the opposite side of the unit by rotating the coil(s)
180 degrees side to side and reworking the coil section panel
on the opposite side of the air handler.
 Direct expansion (DX) coils require 180 degree
rotation on the top to bottom to locate distributor
tubes at the leaving face of the coil.
To reverse the coil connections, follow the steps below, (also
refer to Figure 11).
1. Remove exterior panels from both sides of the coil
section. Remove screws that secure the top of the leaving
coil face to the upper track on the inside top of the unit.
2. Lift drain pan condensate connection above the unit frame
ange and slide drain pan, coil(s) and ba󰀪es out of unit.
3. Remove screws and remove coil blocko󰀨s.
4. Remove screws holding coil to drain pan and remove coil.
5. Rotate the coil 180° and reposition coil blocko󰀨s to the
entering air side of the coil.
6. Drill holes if required and fasten the blocko󰀨s to the
entering side of the coil.
7. If unit has both heating and cooling coils, position and
bolt heating coil and cooling coil casings together in same
arrangement in the direction of airow as unit was shipped
from factory. Reheat coils must remain in reheat position;
do not place in preheat position. Fasten the rst coil in the
air stream to the entering side of the drain pan using the
same holes provided for the coil before it was rotated.
8. Mark locations and drill holes to align with holes in
upper track.
9. Slide the coil, blocko󰀨s and drain pan assembly back into
unit the same way it was removed. Check the installation
for an airtight t. Re-install screws that secure the top of
the leaving coil face to the upper track on the inside top
of the unit.
Depending on whether the air handler was purchased from
stock or if it was manufactured for the specic job, the
panel on the opposite side may or may not have predrilled
connection holes.
1. If connection holes need to be drilled, determine the
proper diameter in order to use the existing grommets.
2. Mark connection locations on panel and drill new holes
to accommodate connections and grommets.
3. Plug and seal unused connection holes on opposite side
panel with new solid grommet or other suitable material.


www.DaikinApplied.com 11 IM 782-12 • DESTINY AIR HANDLERS
Figure 11: Reversing the Coil Handing
Remove screws
from the upper track
that hold coil/drain pan
in place
Position coil/drain pan
assembly in unit and install
screws in upper track.
Lift drain pan connection
up and slide coil/drain pan
assembly out.
Remove screws and
remove coil blockoffs.
Drill holes in coil header plate
flanges, position block offs
and install screws to secure to coil.
Drill holes in coil
bottom flange
and install screws
to secure to
drain pan.
Remove screws
holding coil to
drain pan and
remove coil.
Rotate coil 180°
and reposition in
drain pan.
Mark locations
and drill holes
to align with holes
in upper track.
4
56
7
8
3
2
1
9
NOTE:
Rotate a DX
(evaporator)
coil 180° TOP
to BOTTOM.
Distributors
must be on the
leaving air side
of the coil.
NOTE:
If a heating coil
is used, position
heating coil on
the leaving
side of the
cooling coil.
Airflow
Airflow Airflow
All coils
except DX

IM 782-12 • DESTINY AIR HANDLERS 12 www.DaikinApplied.com

Reversing the Belt Drive Package
A motor side or “hand” is determined by looking in the direction
of air ow with the air contacting the back of the head. The drive
package on the air handler can be changed to the other side of
the blower. The motor base and motor are attached to back of
the fan housing. They can be removed, rotated 180 degrees,
and reattached. The fan sheave can be removed and reinstalled
on the opposite end of the shaft (Figure 12). Review Fan Drive
Adjustments on page 47 when reinstalling the belts.
To reverse the drive package:
1. Loosen the belt adjustment screws to relieve the drive
belt tension.
2. Remove the drive belt and the blower pulley.
3. Loosen the two upper bolts on the motor mounting plate
and slide the motor out from the blower housing mount.
4. Move the top motor mounting bolts to the bottom motor
mounting plate location and vice versa. Fasten securely.
5. Turn the motor 180° and slide it back into the blower
housing mount and tighten bolts.
6. Install the blower pulley and the belt to the other side of
the blower housing.
7. Adjust belt tension.
 Change the motor wiring so the motor rotates in the
opposite direction.
Figure 12: Reversing the Drive Package


Do not suspend the unit from the top. The unit top will not support the weight
of the unit. Equipment damage and severe personal injury can result.
Before hanging, rig and completely assemble the unit. The
Destiny air handler has circular knockouts on the corner
connections. Remove the knockouts and suspend the unit
using threaded rods and hardware (by others) with required
C-channels (by others) on both sides as shown in Figure
13. On unit sizes 007 and larger, L-channels (by others) are
required on both ends in addition to C-channels. For 002 -
010 sized ceiling hung units, spring isolation of the cabinet is
recommended.
Figure 13: Ceiling Hung Installation, Horizontal Units Only
Figure 14: Hanger Bracket Mounting Location (Inches)
Belt
adjustment
bolts (2)
Upper motor
mounting
plate bolts (2)
Lower motor
mounting
plate bolts (2)
C-channels (by others) are required on all units.
On unit sizes 007 and above, L-channels (by others)
on both ends are also required.
Spring Isolators, threaded rods (by others)


www.DaikinApplied.com 13 IM 782-12 • DESTINY AIR HANDLERS

Follow applicable piping design, sizing, and installation
information presented in ASHRAE Handbooks in the design
and installation of piping. Observe all local codes and industry
standards. Do not apply undue stress at the connection to the
coil headers. Support pipe work independently of the coils.
 Destiny cooling coils are supplied as universal-
hand coils. The coils feature four water piping
connection stubs for hydronic coils and two suction
line connections for DX coils. The connections to
be used are clearly marked with labels. Keep other
(unmarked) connections capped. Refer to Figure 15
and Figure 16, detailing the correct stubs that are to
be connected to the system piping.

Water cooling coil guidelines are listed below. Also, refer to
Figure 15.
1. 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.
2. Water supply and water return connections are copper
sweat on units 002 through 010 and male NPT iron pipe
on units 015 through 030.
3. 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.
4. Follow recommendations of the control manufacturer
regarding types, sizing, and installation of controls.
Figure 15: Water Cooling Coil Connections

Direct expansion coil connection guidelines are listed below.
Also, refer to Figure 16.
1. The coil distributor and suction connection extend
through the end panel of the coil section.
2. Check nozzle in distributor for proper tonnage.
3. The thermostat expansion valve must be an external
equalizer tube type. Connect the equalizer tube provided
on the coil (3/16" for units 002 to 010, and 1/4" for units
015 to 030) to the connection on the expansion valve.
4. Use care when piping up the system, making sure
all joints are tight and all lines are dry and free of
foreign material. For typical refrigerant piping, see the
condensing unit product manual.
Figure 16: DX Coil Connections
LH
AIR
FLOW
AIR
FLOW
RH
SUPPLY
RETURN
Lef
t Hand AIr Flow Coil Right Hand AIr Flow
Coil
LH
AIR
FLOW
AIR
FLOW
RH
SUCTION
CONNECTION
SUCTION
CONNECTION
SUCTION
CONNECTION
LIQUID
CONNECTION
Left Hand
Air Flow Coil
Left Hand
Air Flow Coil
Right Hand
Air Flow Coil
Right Hand
Air Flow Coil
LH
AIR
FLOW
AIR
FLOW
RH
LIQUID
CONNECTION
LIQUID
CONNECTION

IM 782-12 • DESTINY AIR HANDLERS 14 www.DaikinApplied.com


(provided as Specials only)
Steam coil connection guidelines are listed below. Also, refer to
Figure 17.
1. All steam coils are non-distributing (freeae) type. They
are not designed to be used in 100% OA applications.
2. Steam supply and steam return connections are
typically male NPT iron pipe and are labeled on the end
panel of coil section. Connections extend through coil
section end panel.
3. 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.
4. Support piping independently of coils and provide
adequate piping exibility. Stresses resulting from
expansion of closely coupled piping can cause serious
damage.
5. 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.
6. Install vacuum breakers on all applications to prevent
retaining condensate in the coil. Connect the vacuum
breaker between the coil inlet and the return main.
7. Do not drip supply mains through the coil.
8. Do not attempt to lift condensate when using modulating
or ON/OFF control.
9. Size traps in accordance with manufacturers’
recommendations. Be certain the required pressure
di󰀨erential will always be available. Do not undersize.
10. Use oat and thermostatic or bucket traps with low
pressure steam. On high pressure steam, use bucket
traps. Use thermostatic traps only for air venting.
11. Use bucket traps only with ON/OFF control.
12. Locate traps at least 12 inches below the coil return
connection.
13. Do not use modulating steam valves on high pressure
systems.
14. Size modulating valves properly. Do not undersize.
15. Destiny steam coils are not recommended for freezing
conditions or entering temperatures below 35°F (1.6°C).
Figure 17: Steam Coil Connections (Type SS)


www.DaikinApplied.com 15 IM 782-12 • DESTINY AIR HANDLERS

Heating coil connection guidelines are listed below. Also, refer
to Figure 18 and Figure 19.
1. Water supply and water return connections extend
through the end panel of the coil section. All connections
are labeled on the end panel.
2. Water supply and water return connections are copper
sweat on units 002 through 010 and male NPT iron pipe
on units 015 through 030.
3. 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.
4. Follow recommendations of the control manufacturer
regarding types, sizes, and installation of controls.
5. Hot water coils are not recommended for use with
entering air below 40°F.
6. If fresh air and return air are to be heated by a hot water
coil, take care in the design of the system to provide
thorough mixing before air enters the coil.
Figure 18: Water Heating Coil Connections
Figure 19: Piping Arrangements
Drain Pan Traps
Destiny air handlers have a drain pan connection on both
sides of the unit. Drain connections can be made on either
side or both sides. Drain lines and traps should run full size
from the drain pan connection. Drain pans should have traps
to allow condensate from coils to drain freely. The trap depth
and distance between the trap outlet and the drain pan outlet
should be twice the static pressure in the drain pan section
under normal operation for the trap to remain sealed. Refer to
Figure 20.
A secondary drain connection on the drain pan is standard on
all Destiny units. Secondary drain connections are required
in some applications as a visual means of identifying clogged
primary drain lines.
Figure 20: Allow Adequate Distance Between Trap Outlet
and Drain Outlet
 The door panels on some applications have a close
clearance over the drain pipes. Extend the drain
tting with a coupling if necessary for door clearance.
One and TwoRow Coil
with Spayed Headers
Vacuum breaker
1/2" check valve
Steam main
Return main
12"min.
Pressure (P)
at the drain pan
2P
2P

IM 782-12 • DESTINY AIR HANDLERS 16 www.DaikinApplied.com


Adjustment
Units have internally isolated fan and motor assemblies that
are secured with brackets for shipment.
Before Operating the Unit
Remove the shipping bracket and bolts and discard. The
shipping brackets located on the opposite drive side of the unit
(Figure 21) are di󰀩cult to access from the drive side of the unit.
Either remove them before the unit is assembled, or remove
the panel on the opposite drive side to gain access.
Figure 21: Removing the Shipping Bracket, Sizes 002–010
Spring Mount Adjustments—Twin Fan

The spring isolators under the four corners of the fan and
motor assembly have been factory adjusted while the fan was
not running. Refer to Table 1. With the unit operating at normal
cfm and static pressure, the isolators should all be at the same
height opening. If adjustments are required, loosen the 5/16"
capscrew on top of the isolator and turn the adjusting bolt to
lower or raise the fan and motor base. Retighten the capscrew
when adjustments are completed. See Figure 22.
When seismic snubbers and/or thrust restraints are provided,
no additional adjustments are required.
Table 1: Spring Mount Adjustment—Twin Fan Units

Fan discharge
position
Top or Bottom
Horizontal “H”  
1 3.75 3.75 4.25
2 4.25 3.75 4.25
3 4.25 3.75 4.25
4 3.75 3.75 4.25
Figure 22: Spring Mount Adjustments—Twin Fan Units
Motor
Fan
POS 1
POS 2
POS
3
POS
4
Airflow
Fan isolator position numbers
Dim"H"
Spring height
adjustment
screw


www.DaikinApplied.com 17 IM 782-12 • DESTINY AIR HANDLERS
Electric Heat Section
(Optional)
Optional factory installed electric heat section consists of
open coil duct heater mounted to the unit at the supply fan
discharge. Heat section includes heating coils and an electrical
control box with single point eld power connection for heater
and supply air fan.
Factory provided eld knockouts are located on the side
of the electric heat control panel for eld power and
control wiring to pass through. A factory installed non-
fused disconnect is located in the electric heat control
panel to disconnect power to the supply air fan and heater
components. All wiring must be in conformance with the
national electric code and local restrictions.
Open Coil Duct Heater
• Complete with overload and thermal protection
• Includes fan interlock and air ow switch safety protection
• High quality, alloy nichrome wire [80%Ni / 20%Cr]
• High di-electric level ceramic insulators
• Screw terminals
Single Point Power
• Non-fused disconnect
• Electric heat is factory wired including contactors and
fuses per step and as required by UL. Refer to Electric
Heat Diagrams on page 23 for typical electric heat
wiring diagrams
• Fan motor is factory wired including contactor or starter
and fuses as applicable
• Fused control transformer allows the heater and fan to be
sequenced by standard 24 volt thermostat
• Indoor control panel with tool access hinged door houses
all components
Quality Control
• Heaters are di-electrically tested for 1000V plus twice the
rated volts, or 2000V whichever is greater. The resistance
of each heater is measured and recorded and must be
within 5% of the rated value
• Every heater is checked during the production process
and as a nal assembly
Figure 23: Heater Nomenclature
Figure 24: Destiny Unit with Left Hand Electric Heat
Electric Heat kW Options
Table 2: KW Options by Unit Size

002 003 004 005 007 010
KW
Range 1.5–10 2.5–20 2.5–20 4–26 6–38 6–55
C M XX - XX - X X
Heater
Modular
Voltage
Steps
Phases
Wattage
Airflow
Removable Pane
l
for Full Access
9.50
2.25
3.00
Knockouts: Four Diameters
2.38, 1.62, 1.88, 1.00
Front
Electric
Heat Matches
Destiny
Fan Discharge
and
Attaches Directly
to
Destiny Unit
3.00
Lef
tHand Electric
Heat
Shown
(Right
Hand Optional)

IM 782-12 • DESTINY AIR HANDLERS 18 www.DaikinApplied.com

Heater Amps
Table 3: Heater Amps
KW Heater Amps
120V / 1Ø 240V / 1Ø 240V / 3Ø 480V / 3Ø 600V / 3Ø
1 8.33 4.17 2.41 1.20 0.96
1.5 12.50 6.25 3.61 1.81 1.45
2 16.67 8.33 4.82 2.41 1.93
2.5 20.83 10.42 6.02 3.01 2.41
3 25.00 12.50 7.23 3.61 2.89
3.5 29.17 14.58 8.43 4.21 3.37
4 33.33 16.67 9.63 4.82 3.85
4.5 37.50 18.75 10.84 5.42 4.34
5 41.67 20.83 12.04 6.02 4.82
5.5 45.83 22.92 13.25 6.62 5.30
6 50.00 25.00 14.45 7.23 5.78
6.5 54.17 27.08 15.66 7.83 6.26
7 58.33 29.17 16.86 8.43 6.74
7.5 62.50 31.25 18.06 9.03 7.23
8 66.67 33.33 19.27 9.63 7.71
8.5 70.83 35.42 20.47 10.24 8.19
9 75.00 37.50 21.68 10.84 8.67
10 83.33 41.67 24.08 12.04 9.63
11 91.67 45.83 26.49 13.25 10.60
12 100.00 50.00 28.90 14.45 11.56
13 108.33 54.17 31.31 15.66 12.52
14 116.67 58.33 33.72 16.86 13.49
15 125.00 62.50 36.13 18.06 14.45
16 133.33 66.67 38.54 19.27 15.41
17 141.67 70.83 40.94 20.47 16.38
18 150.00 75.00 43.35 21.68 17.34
19 158.33 79.17 45.76 22.88 18.30
20 N/A 83.33 48.17 24.08 19.27
22 N/A 91.67 52.99 26.49 21.19
24 N/A 100.00 57.80 28.90 23.12
26 N/A 108.33 62.62 31.31 25.05
28 N/A 116.67 67.44 33.72 26.97
30 N/A 125.00 72.25 36.13 28.90
32 N/A 133.33 77.07 38.54 30.83
34 N/A 141.67 81.89 40.94 32.76
36 N/A 150.00 86.71 43.35 34.68
38 N/A 158.33 91.52 45.76 36.61
40 N/A N/A 96.34 48.17 38.54
45 N/A N/A 108.38 54.19 43.35
50 N/A N/A 120.42 60.21 48.17
55 N/A N/A 132.47 66.23 52.99
Electric Heat Safety
Overcurrent Protection
Overcurrent fuse protection is provided for each stage of
electric heat (in lieu of one per 48 amperes).

Primary - Automatic limit switches, one per step (120°F or
150°F as appropriate).
Backup - Manual reset thermal cutout (180°F).

To prevent the heater from being energized unless the fan
is on, the heater includes two interlock methods: an airow
switch, and the use of an auxiliary contact in the motor starter
contactor (3ph) or a fan relay (1ph).

The airow switch provides the best means of protection against
air failure caused by fan belt or other malfunction. Switches are
of the di󰀨erential pressure, diaphragm-operated type and require
a minimum total pressure di󰀨erential of .05" WC. The switch is
factory wired in series with the manual reset cutout.


www.DaikinApplied.com 19 IM 782-12 • DESTINY AIR HANDLERS
Minimum Air Velocity
Recommended minimum air ow through a specic heater is
shown in Table 4 through Table 10.
Table 4: LAH002 Minimum Air Flow
 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5
Minimum air ow, CFM 184 218 249 274 292 310 328 344 359 371 382 387 398 396 400
 9 10
Minimum air ow, CFM (cont.) 404 409
Table 5: LAH003 Minimum Air Flow
 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10
Minimum air ow, CFM 298 339 368 400 426 446 466 484 501 519 536 550 565 579 605
 11 12 13 14 15 16 17 18 19 20
Minimum air ow, CFM (cont.) 620 629 637 646 652 658 660 660 663 663
Table 6: LAH004 Minimum Air Flow
 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10
Minimum air ow, CFM 298 339 368 400 426 446 466 484 501 519 536 550 565 579 605
 11 12 13 14 15 16 17 18 19 20
Minimum air ow, CFM (cont.) 620 629 637 646 652 658 660 660 663 663
Table 7: LAH005 Minimum Air Flow
 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10 11 12 13
Minimum air ow, CFM 447 477 511 538 561 584 603 622 641 656 672 706 740 771 794
 14 15 16 17 18 19 20 22 24 26
Minimum air ow, CFM (cont.) 809 824 832 840 847 855 859 866 870 874
Table 8: LAH005 Minimum Air Flow
 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10 11 12 13
Minimum air ow, CFM 447 477 511 538 561 584 603 622 641 656 672 706 740 771 794
 14 15 16 17 18 19 20 22 24 26
Minimum air ow, CFM (cont.) 809 824 832 840 847 855 859 866 870 874
Table 9: LAH007 Minimum Air Flow
 6 6.5 7 7.5 8 8.5 9 10 11 12 13 14 15 16 17
Minimum air ow, CFM 637 673 704 729 750 765 790 831 867 903 938 969 1000 1030 1056
 18 19 20 22 24 26 28 30 32 34 36 38
Minimum air ow, CFM (cont.) 1076 1096 1102 1117 1132 1142 1153 1163 1168 1168 1173 1173
Table 10: LAH010 Minimum Air Flow
 6 6.5 7 7.5 8 8.5 9 10 11 12 13 14 15 16 17
Minimum air ow, CFM 637 673 704 729 750 765 790 831 867 903 938 969 1000 1030 1056
 18 19 20 22 24 26 28 30 32 34 36 38 40 45
Minimum air ow, CFM (cont.) 1076 1096 1102 1117 1132 1142 1153 1163 1168 1168 1173 1173 1173 1178

IM 782-12 • DESTINY AIR HANDLERS 20 www.DaikinApplied.com

Electric Heat Operation

Heaters are furnished for zero clearance between the duct and combustible
surfaces. However, it is not recommended that any combustible material be
allowed to touch any electric duct heater or immediate surrounding areas.

Heaters are not intended to be installed with less than 20" of straight duct
at the outlet of the heater.

Field wiring necessary temperatures are:
1) 194°F for dry weather.
2) 167°F for humid weather.
The sampling probe is suitable for left-hand or right-hand
airow and in positive pressure applications may require eld
adjustment so the probe faces upstream. This is normally done
during installation by removing two screws, rotating the probe
180° and replacing the screws. Removing the heater from the
duct is not necessary.
The electric heater is designed to operate while installed and
connected to the unit at the supply air fan discharge, to heat air
passing through the heating elements.
Temperature rise is very important and can be obtained using
the following calculation:
Temperature Rise = (KW) × (3159) / CFM
 Maximum leaving air temperature = 120°F