McQuay LAH002 Installation Manual
Installation and Maintenance Manual IM 782-7
Destiny™ Indoor Air Handler
Sizes 002 through 030
Group: Applied Air
Part Number: IM 782
Date: March 2012
© 2012 McQuay International
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General Information . . . . . . . . . . . . . . . . . . . . . . . 3
Smoke Control and Management Systems. . . 3
Receiving and Handling . . . . . . . . . . . . . . . . . 4
Storing the Unit . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . 5
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 (provided as Specials only). . . . 13
Water Heating Coils . . . . . . . . . . . . . . . . . . . 14
Drain Pan Traps. . . . . . . . . . . . . . . . . . . . . . . . . 15
Internal Isolation Assembly Adjustment . . . . . . . 15
Before Operating the Unit . . . . . . . . . . . . . . . 15
Spring Mount Adjustments—Twin Fan Units 15
Electric Heat Section (Optional). . . . . . . . . . . . . 16
Open Coil Duct Heater . . . . . . . . . . . . . . . . . 16
Single Point Power . . . . . . . . . . . . . . . . . . . . 16
Quality Control . . . . . . . . . . . . . . . . . . . . . . . 16
Electric Heat kW Options . . . . . . . . . . . . . . . 17
Heater Amps. . . . . . . . . . . . . . . . . . . . . . . . . 17
Electric Heat Safety. . . . . . . . . . . . . . . . . . . . 18
Minimum Air Velocity. . . . . . . . . . . . . . . . . . . 19
Electric Heat Operation. . . . . . . . . . . . . . . . . 20
Field Power Wiring . . . . . . . . . . . . . . . . . . . . 20
Supply Power Wiring. . . . . . . . . . . . . . . . . . . 20
Electrical Installation . . . . . . . . . . . . . . . . . . . 20
Variable Frequency Drive (VFD) - Optional . 21
Starters and Disconnect - Optional. . . . . . . . 21
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Electric Heat Diagrams . . . . . . . . . . . . . . . . . . . 22
Disconnect-Only Diagrams . . . . . . . . . . . . . . . . 24
VFD Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . 25
Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Component and Section Weights . . . . . . . . . . . 29
Fan Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Filter Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Coil Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Drain Pan Data . . . . . . . . . . . . . . . . . . . . . . . . . 34
Electric Heat Data . . . . . . . . . . . . . . . . . . . . . . . 34
Fan Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . 40
Cabinet Dimensions—Horizontal. . . . . . . . . . . . 40
Cabinet Dimensions—Vertical. . . . . . . . . . . . . . 42
Mixing Box Dimensions . . . . . . . . . . . . . . . . . . . 43
Electric Heat Dimensions—Left/Right Oriented. 44
Control Box Dimensions . . . . . . . . . . . . . . . . . . 45
Operation Guidelines . . . . . . . . . . . . . . . . . . . . . . 46
Startup Checks . . . . . . . . . . . . . . . . . . . . . . . . . 46
Before Starting the Unit . . . . . . . . . . . . . . . . 46
Operating Limits . . . . . . . . . . . . . . . . . . . . . . 47
Fan Vibration Levels. . . . . . . . . . . . . . . . . . . 47
Service and Maintenance. . . . . . . . . . . . . . . . . . . 48
Periodic Service and Maintenance . . . . . . . . . . 48
Ball Bearing Lubrication . . . . . . . . . . . . . . . . 48
Fan Drive Adjustments. . . . . . . . . . . . . . . . . 48
Fan Drive Belt Adjustment . . . . . . . . . . . . . . 52
Coil Maintenance . . . . . . . . . . . . . . . . . . . . . 53
Component Removal and Replacement. . . . 53
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Warranty Details . . . . . . . . . . . . . . . . . . . . . . . . 54
Warranty Return Material Procedure . . . . . . 54
Replacement Parts. . . . . . . . . . . . . . . . . . . . 54
Destiny Equipment Warranty Registration Form 55
Quality Assurance Survey Report . . . . . . . . . . . 57
Introduction
General Information
WARNING
Improper installation or maintenance can cause equipment
damage or personal injury.
Installation and maintenance must be performed by qualified
personnel familiar with applicable codes and regulations, and
experienced with this type of equipment.
AVERTISSEMENT
Une installation ou un entretien inadéquats peut
endommager l’équipement ou entraîner des blessures
personnelles. L’installation et l’entretien doivent être
exécutés par un personnel qualifié, familier avec les codes et
règlements applicables et possédant de l’expérience avec ce
type d’équipement.
Introduction
WARNING
Fan motor requires overload protection.
Failure to provide motor overload protection can result in fire,
property damage, electric shock, personal injury or death.
Connect motor to an overload protective device rated in
compliance with local electric codes.
AVERTISSEMENT
Risques d’incendie. À défaut d’installer un sectionneur à
fusible à action rapide de type J, cela peut entraîner des
dommages à la propriété, des blessures ou la mort.
Un sectionneur à fusible à action rapide de type J doit être
installé avant le variateur de fréquence
Smoke Control and Management Systems
CAUTION
Sharp edges and coil surfaces can cause personal injury.
Avoid contact with them.
ATTENTION
Les bords tranchants et les surfaces des bobines sont un
risque de blessure. Ne les touchez pas.
CAUTION
Destiny units are not designed to be weather resistant; DO
NOT install outdoors.
ATTENTION
Les Unités Destiny ne sont pas à l’épreuve des intempéries;
NE PAS les installer à l’extérieur.
WARNING
Improper grounding may result in severe injury or death.
Check grounding nut tightness before connecting power to the
external junction box.
AVERTISSEMENT
Une mise à la terre défaillante peut causer des blessures
graves ou la mort. Vérifiez l’étanchéité des vis de mise à terre
avant d’alimenter la boite de jonction externe.
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
.
WARNING
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 fire codes and NFPA
requirements for the specific 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 fit and
sufficient 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.
AVERTISSEMENT
Un traitement inadéquat de l’air contenant de la fumée peut
entraîner des blessures personnelles ou même la mort.
Un ingénieur professionnel doit faire la conception et
approuver l’unité de traitement d’air et son application pour
s’assurer que le contrôle de la fumée rencontre les codes
d’incendies locaux et les normes NFPA pour l’application
spécifique du bâtiment.
Dû à la grande diversité de conceptions des édifices ainsi que
des conditions d’opération ambiantes dans lesquelles nos
produits peuvent être appliqués, nous n’avançons ni ne garantissons que nos produits seront adéquats et efficaces quant au
contrôle de la fumée. Le propriétaire et le concepteur du
bâtiment doivent consulter un ingénieur professionnel à cet
égard
McQuay IM 782-7 3
Introduction
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 file 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, filter removal, lubricat ion, belt adjust ment,
and removal of coils, if necessary (refer to Figure 2 for
service clearances).
4 Use flexible 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.
Storing the Unit
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.
4 McQuay IM 782-7
Installation Guidelines
Cleat locations
Cleat
installation
Cleat locations
(sizes 015 and above)
Attaching the Mixing Box
Mixing boxes ship with Destiny units as a field-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
Installation Guidelines
McQuay IM 782-7 5
Installation Guidelines
Width
To p v i e w
Width of
fan section
Width of
C
oil section
30.00”
Width
Height
Vertical uni t
Electric power clearance
54"
12"
Height
Horizontal unit
For Bottom Filter Access Only
Provide 30 Clearance for
Filter Removal
" Vertical
Width
(maximum)
Service Clearances
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
filter replacement, drain pan inspection and cleaning, fan
bearing lubrication, and belt adjustment. Provide sufficient
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 field modified to
right or left hand to accommodate clearance restrictions. See
Reversing the Coil Handing‚ page 10 and Reversing the Belt
Drive Package‚ page 12.
Figure 2: Servicing Space Requirements
For routine maintenance, remove panels on either side of the
unit. See Panel Removal‚ page 8. Optional service doors are
available for the fan and filter sections. Allow sufficient 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 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 6" deep (12" maximum (see Figure 2,
page 6).
6 McQuay IM 782-7
Installation Guidelines
Vertical unit
Horizontal unit
Rigging
Rig units using straps or a sling. Fasten strapping under the
skid that ships with the section. If a field-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
Horizontal unit
Unit Leveling
Place the equipment on a flat 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 misfit or
binding of the doors and panels and improper draining of drain
pans.
Figure 4: Leveling the Unit
Vertical unit
McQuay IM 782-7 7
Installation Guidelines
Panels and Doors
DANGER
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.
DANGER
Pieces mobiles dangereuses, haute pression statique et/ou
de hautes tensions. Risques de blessures graves, voire
mortelles.
Débranchez et verrouillez toutes les alimentation électriques
avant de pénétrer ou d’intervenir sur cet appareil. Cet appareil
peut étre alimenté par plusieurs sources etlou par
l’intermédiaire de plusieurs disjoncteurs éloignés.
Attachez les disques d’entrainement afin d’éviter que les
moteurs et le ventilateur ne tournent librement.
A Ia sortie de l’appareil, fermer le panneau d’accès avec Ia vis
ou avec le mécanisme de verrouillage de Ia poignée de porte
qui sont founis pour éviter toute entrée inopinée.
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 off
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.
Figure 5: Panel Removal
Figure 6: Fan Section Doors
Actuators
The factory-mounted actuator has been initially adjusted in the
factory. Power and control wiring, as well as fine-tuning
adjustment, is to be performed in the field.
The installing contractor is responsible for the mounting of all
field-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 field 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 different 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.
CAUTION
Maximum damper rotation is 70°. Maximum shaft torque is 205
in.-lb. Greater rotation or torque can cause equipment damage.
ATTENTION
La rotation maimale des volets est de 70°. Le couple (torque)
maximum de l’arbre est de 205 in./lb. Une plus grande rotation
Fan Section Doors
1 Use a flat head screwdriver and rotate the screw 1/4 turn
(ou torque) peut endommager l’équipement.
as shown in Figure 6.
2 Rotate door handle 1/4 turn and open the door.
8 McQuay IM 782-7
Installation Guidelines
Figure 7: Factory Mounted Actuator
For good air flow control, adjust the linkage so that the damper
blades do not open beyond 70°. Opening a damper blade
beyond 70° will have little effect 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.
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.
Figure 9: Actuator Manual Override Button and Strap
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).
Figure 10: Actuator Universal Clamp Rotation
Figure 8: Actuator on Damper Shaft
Disengage the actuator gear train by pressing the manual
3
override button (Figure 9) and ro tate the clamp until
centered.
Tighten the two nuts on the universal clamp with a
6
wrench.
McQuay IM 782-7 9
Installation Guidelines
Reversing the Coil Handing
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.
Note: Direct expansion (DX) coils require 180 degree rotation
on the top to bottom to locate distributor tubes at the
leaving face of the coil.
CAUTION
Sharp edges and coil surfaces can cause personal injury.
Avoid contact with them.
ATTENTION
Les bords tranchants et les surfaces des bobines sont un
risque de blessure. Ne les touchez pas.
To reverse the coil connections, follow the steps below, (also
refer to Figure 11, page 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 flange and slide drain pan, coil(s) and baffles out
of unit.
3 Remove screws and remove coil blockoffs.
4 Remove screws holding coil to drain pan and remove
coil.
5 Rotate the coil 180° and reposition coil blockoffs to the
entering air side of the coil.
6 Drill holes if required and fasten the blockoffs 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 airflow as unit was
shipped from factory. Reheat coils must remain in reheat
position; do not place in preheat position. Fasten the first
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, blockoffs and drain pan assembly back
into unit the same way it was removed. Check the
installation for an airtight fit. 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 specific 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.
10 McQuay IM 782-7
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
5
6
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 in
the same location
as unit was shipped
from factory. Reheat
coils must remain in
reheat positon; do not
place in preheat postiion.
Airflow
Airflow
Airflow
All coils
except DX
Installation Guidelines
McQuay IM 782-7 11
Installation Guidelines
Belt
adjustment
bolts (2)
Upper motor
mounting
plate bolts (2)
Lower motor
mounting
plate bolts (2)
C-channels are required on all units.
On unit sizes 007 and above, L-channels
on both ends are also required.
Spring Isolators
Reversing the Belt Drive Package
A motor side or “hand” is determined by looking in the
direction of air flow 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‚ page 48 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.
Note: Change the motor wiring so the motor rotates in the
opposite direction.
1 Install the blower pulley and the belt to the other side of
the blower housing.
2 Adjust belt tension.
Hanging the Unit from a Ceiling
Before hanging, rig and completely assemble the unit.
WARNING
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.
AVERTISSEMENT
Ne pas suspendre l’unité par le toit. Le dessus de l’unité ne
supportera pas le poids de l’unité. Ceci pourrait entraîner des
dommages à l’unité ou des blessures personnelles graves.
The Destiny air handler has circular knockouts on the corner
connections. Remove the knockouts and suspend the unit using
threaded rods and hardware with required C-channels on both
sides as shown in Figure 13. On unit sizes 007 and larger,
L-channels are required on both ends in addition to
C-channels. For 002 - 010 sized ceiling hung units, spring
isolation of the cabinet is recommended. See Figure 13.
Figure 13: Ceiling Hung Installation, Horizontal Units Only
Figure 12: Reversing the Drive Package
12 McQuay IM 782-7
Installation Guidelines
LH
AIR
FLOW
AIR
FLOW
RH
SUPPLY
RETURN
Left 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
Piping and Coils
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.
Note: 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 14 and Figure 15, detailing the
correct stubs that are to be connected to the system
piping.
Water Cooling Coils
Water cooling coil guidelines are listed below. Also, refer to
Figure 14.
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 14: Water Cooling Coil Connections
Direct Expansion Coils
Direct expansion coil connection guidelines are listed below.
Also, refer to Figure 15.
1 The coil distributor and suction connection extend
2 Check nozzle in distributor for proper tonnage.
3 The thermostat expansion valve must be an external
through the end panel of the coil section.
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 15: DX Coil Connections
Steam Coils (provided as Specials only)
Steam coil connection guidelines are listed below. Also, refer
to Figure 16, page 14.
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 flexibility. 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.
McQuay IM 782-7 13
Installation Guidelines
One and Two Row Coil
with Spayed Headers
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
differential will always be available. Do not undersize.
10 Use float 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 16: Steam Coil Connections (Type SS)
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 17: Water Heating Coil Connections
Figure 18: Piping Arrangements
Steam main
Vacuum breaker
1/2" check valve
Water Heating Coils
Heating coil connection guidelines are listed below. Also, refer
to Figure 17 and Figure 18.
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.
12" min.
Return main
14 McQuay IM 782-7
Installation Guidelines
Pressure (P)
at the drain pan
2P
2P
Motor
Fan
POS 1
POS 2
POS 3
POS 4
Airflow
Fan isolator position numbers
Dim "H"
Spring height
adjustment screw
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 19.
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 19: Allow Adequate Distance Between Trap Outlet
and Drain Outlet
Spring Mount Adjustments—Twin Fan Units
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 21
below.
When seismic snubbers and/or thrust restraints are provided,
no additional adjustments are required.
Table 1: Spring Mount Adjustment—Twin Fan Units
Spring mount adjustment at rest, unit sizes 015 to 030
ONLY
Fan
discharge
position
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
Top or bottom
horizontal H
DownblastHUpblast
H
Figure 21: Spring Mount Adjustments—Twin Fan Units
Note: The door panels on some applications have a close
clearance over the drain pipes. Extend the drain fitting
with a coupling if necessary for door clearance.
Internal Isolation Assembly 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 20) are difficult to access from the drive side of the
unit. Either remove them before the unit is assemb led , or
remove the panel on the opposite drive side to gain access.
Figure 20: Removing the Shipping Bracket, Sizes 002–010
McQuay IM 782-7 15
Installation Guidelines
C M XX - XX - XX
Heater
Phases
Wattage
Voltage
Modular
Steps
Airflow
Removable Panel
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
Left Hand Electric
Heat Shown
(Right Hand Optional)
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 field power connection for heater
and supply air fan.
Factory provided field knockouts are located on the side of the
electric heat control panel for field 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 flow switch safety protection
• High quality, alloy nichrome wire [80%Ni / 20%Cr]
• High di-electric level ceramic insulators
• Screw terminals
Figure 22: Heater Nomenclature
Single Point Power
• Non-fused disconnect
• Electric heat is factory wired including contactors and fu ses
per step and as required by UL. Refer to Electric Heat
Diagrams‚ page 22 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 final assembly
Figure 23: Destiny Unit with Left Hand Electric Heat
16 McQuay IM 782-7
Electric Heat kW Options
Table 2: KW Options by Unit Size
Unit Size
002 003 004 005 007 010
KW Range
1.5 - 102.5 - 202.5 20
Heater Amps
Table 3: Heater Amps
Installation Guidelines
4 - 26 6 - 38 6 - 55
KW
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
120 V / 1Ø 240 V / 1Ø 240 V / 3Ø 480 V / 3Ø 600 V / 3Ø
Heater Amps
McQuay IM 782-7 17
Installation Guidelines
Electric Heat Safety
Overcurrent Protection
Overcurrent fuse protection is provided for each stage of
electric heat (in lieu of one per 48 amperes).
Thermal (Over Te mperature) Pro tectio n
Primary - Automatic limit switches, one per step (120°F or
150°F as appropriate).
Backup - Manual reset thermal cutout (180°F).
Fan Interlock Method:
To prevent the heater from being energized unless the fan is
on, the heater includes two interlock methods: an airflow
switch, and the use of an auxiliary contact in the motor starter
contactor (3ph) or a fan relay (1ph).
Airflow Switch:
The airflow switch provides the best means of protection
against air failure caused by fan belt or other malfunction.
Switches are of the differential pressure, diaphragm-operated
type and require a minimum total pressure differential of .05"
WC. The switch is factory wired in series with the manual
reset cutout.
18 McQuay IM 782-7
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