McQuay IM 782-2 Installation Manual
Installation and Maintenance IM 782-2
Group: Destiny Air Handler
Destiny™ Air Handler
Sizes 002 to 030
Part Number: IM 782
Date: March 2007
© 2007 McQuay International
Contents
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
Fan Section Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mounting Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reversing the Coil Handing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reversing the Drive Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Hanging the Unit from a Ceiling . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Piping and Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Water Cooling Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Direct Expansion Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Steam Coils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Water Heating Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Drain Pan Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Internal Isolation Assembly Adjustment . . . . . . . . . . . . . . . . . . . . 14
Before Operating the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Spring Mount Adjustments—Twin Fan Units . . . . . . . . . . . . 14
Electric Heat Section (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Open Coil Duct Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Single Point Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Electric Heat KW Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Heater Amps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electric Heat Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal (Over temperature) Protection. . . . . . . . . . . . . . . . . 18
Fan Interlock Method: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Airflow Switch: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electric Heat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Field Power Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Supply Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Operation Guidelines . . . . . . . . . . . . . . . . . . . . . . 20
Startup Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Before starting the unit: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
After first 48 hours of operation: . . . . . . . . . . . . . . . . . . . . . . 21
Operating Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Fan Vibration Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Vibration Causes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Service and Maintenance . . . . . . . . . . . . . . . . . . . 22
Periodic Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 22
Ball Bearing Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fan Drive Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
VM and VP Variable Pitch Key Type Sheaves . . . . . . . . . . . 23
LVP Variable Speed Sheaves . . . . . . . . . . . . . . . . . . . . . . . . 23
MVP Variable Speed Sheaves . . . . . . . . . . . . . . . . . . . . . . . 25
Fan Drive Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
General Rules of Tensioning . . . . . . . . . . . . . . . . . . . . . . . . . 26
Tension Measurement Procedure . . . . . . . . . . . . . . . . . . . . . 26
Coil Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Component Removal and Replacement . . . . . . . . . . . . . . . . . . . . 28
Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fan Section Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Coil Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . 28
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Warranty Return Material Procedure . . . . . . . . . . . . . . . . . . . 29
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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.
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.
Smoke Control and Management Systems
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
garan-tissons 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 782-2 3
General Information
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, lubrication, belt adjustment,
and removal of coils, if necessary.
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 782-2
Installation Guidelines
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.
Figure 1: Mixing Box Installation
Cleat locations
Install the cleats into the interior mounting frames, with the
hardware included as shown in Figure 1.
Cleat
installation
Cleat locations
(sizes 015 and above)
McQuay IM 782-2 5
Installation Guidelines
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” on page 9 and “Reversing the
Drive Package” on page 11.
Figure 2: Servicing Space Requirements
Vertical unit
Width
Height
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 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 12" deep (see Figure 3).
Figure 3: Service Clearance for Electrical Power Devices
54"
Horizontal unit
Width of
fan section
Top view
coil section
Width of
12"
Width
30.00”
Height
Width
6 McQuay IM 782-2
Installation Guidelines
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 4: 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 5: Leveling the Unit
Horizontal unit
Vertical unit
Vertical unit
McQuay IM 782-2 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.
Fan Section Doors
1 Use a flat head screwdriver and rotate the screw 1/4 turn as
shown in Figure 7.
2 Rotate door handle 1/4 turn and open the door.
Figure 7: Fan Section Doors
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 6: Panel Removal
Mounting Actuators
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.
8 McQuay IM 782-2
Installation Guidelines
Reversing the Coil Handing
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,
referring to Figure 8 on page 10.
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.
10 If connection holes need to be drilled, determine the proper
diameter in order to use the existing grommets.
11 Mark connection locations on panel and drill new holes to
accommodate connections and grommets.
12 Plug and seal unused connection holes on opposite side
panel with new solid grommet or other suitable material.
McQuay IM 782-2 9
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