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

Installation Guidelines

Minimum Air Velocity

Recommended minimum air flow through a specific heater is
shown in the following tables.

Table 4: LAH002 Minimum Air Flow

Heater Capacity, kW 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 flow, CFM 184 218 249 274 292 310 328 344 359 371 382 387 398 396 400

Heater Capacity, kW 9 10

Minimum air flow, CFM 404 409

Table 5: LAH003 Minimum Air Flow

Heater Capacity, kW 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10

Minimum air flow, CFM 298 339 368 400 426 446 466 484 501 519 536 550 565 579 605

Heater Capacity, kW 11 12 13 14 15 16 17 18 19 20

Minimum air flow, CFM 620 629 637 646 652 658 660 660 663 663

Table 6: LAH004 Minimum Air Flow

Heater Capacity, kW 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10

Minimum air flow, 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 flow, CFM 620 629 637 646 652 658 660 660 663 663

Table 7: LAH005 Minimum Air Flow

Heater Capacity, kW 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10 11 12 13

Minimum air flow, CFM 447 477 511 538 561 584 603 622 641 656 672 706 740 771 794

Heater Capacity, kW 14 15 16 17 18 19 20 22 24 26

Minimum air flow, CFM 809 824 832 840 847 855 859 866 870 874

Table 8: LAH005 Minimum Air Flow

Heater Capacity, kW 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 10 11 12 13

Minimum air flow, CFM 447 477 511 538 561 584 603 622 641 656 672 706 740 771 794

Heater Capacity, kW 14 15 16 17 18 19 20 22 24 26

Minimum air flow, CFM 809 824 832 840 847 855 859 866 870 874

Table 9: LAH007 Minimum Air Flow

Heater Capacity, kW 6 6.5 7 7.5 8 8.5 9 10 11 12 13 14 15 16 17

Minimum air flow, CFM 637 673 704 729 750 765 790 831 867 903 938 969 1000 1030 1056

Heater Capacity, kW 18 19 20 22 24 26 28 30 32 34 36 38

Minimum air flow, CFM 1076 1096 1102 1117 1132 1142 1153 1163 1168 1168 1173 1173

Table 10: LAH010 Minimum Air Flow

Heater Capacity, kW 6 6.5 7 7.5 8 8.5 9 10 11 12 13 14 15 16 17

Minimum air flow, CFM 637 673 704 729 750 765 790 831 867 903 938 969 1000 1030 1056

Heater Capacity, kW 18 19 20 22 24 26 28 30 32 34 36 38 40 45

Minimum air flow, CFM 1076 1096 1102 1117 1132 1142 1153 1163 1168 1168 1173 1173 1173 1178

McQuay IM 782-7 19

Installation Guidelines

Electric Heat Operation

The sampling probe is suitable for left-hand or right-hand
airflow and in positive pressure applications may require field
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

Note: Maximum leaving air temperature = 120°F

NOTICE

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.

NOTICE

Heaters are not intended to be installed with less than 20” of
straight duct at the outlet of the heater.

NOTICE

Field wiring necessary temperatures are:

1) 194°F for dry weather.

2) 167°F for humid weather.

Field Power Wiring

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.

Wiring must comply with all applicable codes and ordinances.
The warranty is voided if wiring is not in accordance with
these specifications. An open fuse or starter indicates a short,
ground, or overload. Before replacing a fuse or resetting a
starter, identify the trouble and correct.

According to the National Electrical Code, a disconnecting
means shall be located within sight of and readily accessible
from the air conditioning equipment. Power leads must be
over-current protected at the point of distribution. The
maximum allowable overcurrent protection (MROPD) appears
on the unit nameplate.

WARNING

Hazardous voltage. Can cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.

AVERTISSEMENT

Haut voltage. Peut causer des blessures sévères ou la mort.
Déconnectez la puissance électrique avant tous travaux de
maintenance. Plus d’une déconnection peut être requis pour
éteindre complètement l’unité.

Supply Power Wiring

1 Allowable voltage tolerances:

a 60 Hertz

– Nameplat e 208V: Min. 187V, Max. 229V
– Nameplat e 230V: Min. 207V, Max. 253V
– Nameplat e 460V: Min. 414V, Max. 506V
– Nameplat e 575V: Min. 518V, Max. 633V

b 50 Hertz

– Nameplat e 380V: Min. 360V, Max. 418V

2 Minimum Circuit Ampacity (MCA) Calculation is based

on the following formulas:

– Electric heat less than or equal to 50 kW

MCA = 1.25 (heater FLA + largest motor loads) +
(the rest of the loads)

– Electric heat greater than or equal to 50 kW

MCA = 1.25 (largest motor load) + (the rest of the
loads) + heater FLA

3 Size wires in accordance with Table 310-16 or 310-19 of

the National Electrical Code.

4 Wires should be sized for a maximum of 3% voltage

drop.

Electrical Installation

1 Electrical service to the fan must correspond to the rated

voltage on the motor nameplate and be in conformance
with the National Electric Code and local restrictions.

2 The fan section metal frame must be connected to the

building electrical ground.

3 A door electrical interlock is not provided as standard.
4 Thermal motor protection is external to the unit. Unless

the unit is provided with a unit mounted starter, thermal
protection and a disconnect switch provision per electric
codes are provided by others.

5 When the unit is factory provided with a junction box,

disconnect switch, starter, or a variable frequency drive
(VFD), the components are mounted on the outside of
the unit cabinet. Factory wiring is provided from the
device to the unit internal motor.

20 McQuay IM 782-7

Variable Frequency Drive (VFD) - Optional

1 When the unit is provided with a VFD only, refer to the

VFD manual for wire size and torque requirements. A fast­blow fused disconnect is recommended for VFD
applications. Motor operation below 20 Hz or over 90 Hz is
not recommended. For typical wiring diagrams, see

Figure 28 and Figure 29.

2 Refer to OM 844-1 (MD2 drives) or OM 895 (MD3 drives)

for VFD set-up details. The drives are installed with only
default programming and are to be field configured to meet
application requirements. Information on ATV11 drives

may be found in VFD manufacturer’s manuals.

WARNING

Fire hazard. Failure to use fast-blow J-type fuses could
result in property damage, injury, or death. Fast-blow fuses

must be installed upstream of a VFD.

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

3 Units with Direct-Drive Plenum fans need to be

reprogrammed in the field according to design point
parameters. Refer to project documentation and/or fan
curves (Figure 32 through Figure 40) for appropriate fan
speeds associated with the job. Use the formula below to
calculate the maximum frequency associated with the
maximum allowable fan speed.

F

= 60 Hz * (W

max

max

/ W

motor

)

Installation Guidelines

CAUTION

Never operate a fan over the maximum speed indicated on
the fan curve, as this may cause fan damage and severe
unit vibration.

ATTENTION

Ne jamais faire tourner le ventilateur plus rapidement que la
vitesse maximum indiquée sur la courbe de performances.
Cela pourrait causer des dommages au ventilateur et
provoquer de sévères vibrations de l’unité.

Starters and Disconnect - Optional

1 The fan motor is factory wired to an externally mounted

control box. Control box options include: disconnect­only (fused and non-fused) and starter-fused disconnect
transformer.

2 A fast-blow fused disconnect (J-type fuses) is used in

VFD applications.

3 A fused control transformer allows the fan to be

sequenced by standard 24-volt thermostat or controller.

4 An indoor panel with tool access hinged door houses all

the components and is generally mounted on the unit’s
bulkhead panel. The panel enclosure has several
knockouts located on the side, top, and bottom.

5 All field wiring must be in conformance with the

National Electric Code and local restrictions.

6 Refer to Figure 26 and Figure 27 for typical disconnect-

only wiring diagrams. Refer to Figure 41 and Figure 43
for typical full control box diagrams.

- maximum frequency allowable for particular

F

max

application (Hz)

- maximum fan speed (rpm); refer to fan curves

W

max

W

- nominal motor speed (1800/3600 rpm); refer to

motor

motor nameplate

Refer to Table 34 for operating li mit information for
Backward-Inclined Direct-Drive Plenum fans.

McQuay IM 782-7 21

Wiring Diagrams

Wiring Diagrams

Electric Heat Diagrams

Figure 24: Typical 1-Phase, 240 Volt Electric Heat Wiring Diagram

1 step, 1 phase, 240 VAC, 60 Hz

22 McQuay IM 782-7

Figure 25: Typical 3-Phase, 575 Volt Electric Heat Wiring Diagram

Wiring Diagrams

4 steps, 3 phase, 575 VAC, 60 Hz

McQuay IM 782-7 23

Wiring Diagrams

Disconnect-Only Diagrams

Figure 26: Typical Single-Phase, Disconnect-Only Wiring Diagram

Figure 27: Typical 3-Phase, Disconnect-Only Wiring Diagram

24 McQuay IM 782-7

VFD Diagrams

Figure 28: Typical MD2 VFD Wiring Diagram

Wiring Diagrams

McQuay IM 782-7 25

Wiring Diagrams

Figure 29: Typical MD3 VFD Wiring Diagram

26 McQuay IM 782-7

Figure 30: Typical Single-Phase Starter/Disconnect Wiring Diagram

Wiring Diagrams

McQuay IM 782-7 27

Wiring Diagrams

Figure 31: Typical 3-Phase Starter/Disconnect Wiring Diagram

28 McQuay IM 782-7

Physical Data

Component and Section Weights

Table 11: Unit Coil Weights

Coil type

4-row chilled water

6-row chilled water

1-row hot water

2-row hot water

4-row DX

6-row DX

002 003 004 005 007 010 015 020 025 030

31.64

(14.35)

39.94

(18.12)

16.11

(7.31)

24.36

(11.05)

32.73

(14.85)

43.37

(19.67)

40.56

(18.40)

54.81

(24.86)

19.95
(9.05)

29.96

(13.59)

42.91

(19.46)

57.01

(25.86)

54.30

(24.64)

69.01

(31.30)

28.36

(12.86)

38.07

(17.27)

50.11

(22.73)

71.53

(32.45)

59.19

(26.85)

86.91

(39.42)

33.60

(15.24)

46.13

(20.92)

64.80

(29.39)

91.69

(41.59)

Table 12: Base Unit Cabinet Weights—Horizontal Unit with Forward Curved Fan

Weight—lbs (kg)

Configuration Configuration Configuration Configuration Configuration

Unit
size

No heat

Flat

filters

Cooling

coil

Reheat

coil
Flat

filters

Cooling

coil

No heat
Angular

filters

Cooling

coil

Reheat

coil

Angular

filters

Cooling

coil

No heat*

filters

Fan Fan Fan Fan Fan Fan Fan Fan Fan Fan

002 142.34 (64.56) 187.56 (85.08) 122.36 (55.50) 149.39 (67.76)

003 170.89 (77.51) 213.02 (96.62) 148.04 (67.150 169.18 (76.74)

004 207.68 (94.20) 257.99 (117.02) 182.04 (82.47) 205.76 (93.33)

005 245.41 (111.32) 317.41 (143.98) 213.25 (96.73) 253.09 (114.80)

007 262.71 (119.16) 340.86 (154.61) 224.74 (101.94) 271.81 (123.29)

010 302.58 (137.25) 392.63 (178.09) 260.15 (118.00) 312.73 (141.85)

015 359.18 (162.92) 463.09 (210.05) 352.58 (159.93) 411.89 (186.83)

020 445.55 (202.10) 596.73 (270.67) 440.70 (199.90) 533.01 (241.77)

025 559.02 (253.57) 736.09 (333.89) 554.95 (251.72) 658.10 (298.51)

030 603.25 (273.63) 817.52 (370.82) 599.00 (271.70) 730.10 (331.17)

Note: *Ventilation only

Weight—lbs (kg)

84.80

(38.46)

112.30
(50.94)

45.86

(20.80)

64.28

(29.16)

88.18

(40.00)

105.18
(47.71)

Reheat

Flat

coil
Flat

filters

111.99

(50.80)

154.05
(69.88)

66.07

(29.97)

83.91

(38.06)

115.42

(52.35)

158.52
(71.90)

No heat*

Angular

185.93
(84.34)

261.55

(118.64)

91.35

(41.44)

121.10
(54.93)

195.54
(88.70)

268.37

(121.73)

filters

N/A N/A N/A N/A

255.08

(115.70)

353.14

(160.18)

116.29
(52.75)

171.48
(77.78)

248.63

(112.78)

365.31

(165.71)

Reheat

coil

Angular

filters

Physical Data

298.34

(135.32)

416.35

(188.85)

132.03
(59.89)

197.12
(89.41)

300.8

136.44)

(

429.85

(194.98)

Preheat coil

Flat

filters

Cooling

coil

157.12
(71.27)

186.67
(84.67)

233.73

(106.02)

267.13

(121.17)

298.53

(135.41)

341.67

(154.98)

419.72

(190.38)

511.86

(232.18)

616.52

(279.65)

633.19

(287.21)

341.54

(154.92)

477.93

(216.79)

168.86
(76.59)

223.03

(101.16)

344.86

(156.43)

493.24

(223.73)

Angular

filters

Cooling

coil

184.19

(83.55)

208.34
(94.50)

257.55

(116.82)

307.89

(139.66)

346.93

(157.36)

395.58

(179.43)

480.74

(218.06)

606.56

(275.13)

773.96

(351.06)

830.10

(376.53)

McQuay IM 782-7 29

Physical Data

Table 13: Base Unit Cabinet Weights—Horizontal Unit with Plenum Fan

Weight—lbs (kg)

Configuration Configuration Configuration Configuration Configuration

Reheat

coil
Flat

filters

Cooling

coil

No heat
Angular

filters

Cooling

coil

Unit
size

No heat

Flat

filters

Cooling

coil
Fan Fan Fan Fan Fan Fan Fan Fan Fan Fan

002 126 (57) 125 (57) 102 (46) 105 (47) 129 (59) 128 (58)
003 140 (63) 161 (73) 131 (59) 151 (69) 168 (76) 173 (78)
004 220 (100) 214 (97) 193 (88) 193 (88) 225 (102) 252 (114)
005 186 (84) 231 (105) 175 (79) 202 (92) 216 (98) 237 (107)
007 285 (129) 315 (143) 224 (102) 267 (121) 304 (138) 349 (158)
010 309 (140) 395 (179) 270 (122) 316 (143) 392 (178) 454 (206)
015 561 (254) 600 (272) 545 (247) 583 (264) 626 (284) 674 (306)
020 663 (301) 708 (321) 679 (308) 692 (314) 729 (331) 774 (351)
025 743 (337) 740 (335) 698 (317) 845 (383) 767 (348) 788 (357)
030 770 (349) 947 (430) 749 (340) 894 (406) 929 (421) 941 (427)

Note: *Ventilation only

Table 14: Base Unit Cabinet Weights—Vertical Unit

Configuration Configuration

Unit size

No heat Reheat coil No heat* Reheat coil

Flat filters Flat filters Flat filters Flat filters

Cooling coil Cooling coil N/A N/A

Fan Fan Fan Fan

002 134.70 (61.10) 134.70 (61.10)
003 183.20 (83.10) 183.20 (83.10)
004 209.79 (95.16) 209.79 (95.16)
005 239.00 (108.40) 239.00 (108.40)
007 349.08 (158.30) 349.08 (158.30)
010 399.23 (181.09) 399.23 (181.09)
015 484.20 (219.63) 484.20 (219.63)
020 566.96 (257.17) 566.96 (257.17)
025 725.28 (328.98) 725.28 (328.98)
030 750.14 (340.26) 750.14 (340.26)

Note: *Ventilation only

Reheat

coil

No heat*

Angular

filters

Cooling

coil

Weight—lbs (kg)

Flat

filters

Reheat

coil
Flat

filters

No heat*

Angular

filters

Reheat

Angular

filters

N/A N/A N/A N/A

coil

Preheat coil

Flat

filters

Cooling

coil

Angular

filters

Cooling

coil

Table 15: Electric Heat Weights

Unit size

002 31 (14.00) 35 (16.00) - ­003 32 (14.50) 36 (16.50) 41 (18.50) 45 (20.50)
004 32 (14.50) 36 (16.50) 41 (18.50) 45 (20.50)
005 34 (15.50) 39 (17.50) 43 (19.50) 47 (21.50)
007 36 (16.50) 41 (18.50) 45 (20.50) 50 (22.50)
010 36 (16.50) 41 (18.50) 45 (20.50) 50 (22.50)

1 Step 2 Steps 3 Steps 4 Steps

Weight—lbs (kg)

30 McQuay IM 782-7

Table 16: Motor Weights***

Unit
size

002

003

004

005

007

010

015

020

025

030

Note: * 56/ 56H fr ame an d 5/8" shaft dia meter for 1 -ph mo tors

Motor

Max. weight, lb

(kg)

Frame size 56 56 56 * ** 145T ------

Shaft dia. in5/85/85/8***7/8------

Max. weight, lb

(kg)

Frame size 56 56 56 * ** 145T 182T 184T - - - -

Shaft dia. in 5/8 5/8 5/8 * ** 7/8 1-1/8 1-1/8 - - - -

Max. weight, lb

(kg)

Frame size 56 56 56 * ** 145T 182T 184T - - - -

Shaft dia. in 5/8 5/8 5/8 * ** 7/8 1-1/8 1-1/8 - - - -

Max. weight, lb

(kg)

Frame size - - 56 * ** 145T 182T 184T - - - -

Shaft dia. in - - 5/8 * ** 7/8 1-1/8 1-1/8 - - - -

Max. weight, lb

(kg)

Frame size - - - * ** 145T 182T 184T 213T - - -

Shaft dia. in - - - * ** 7/8 1-1/8 1-1/8 1-3/8 - - -

Max. weight, lb

g)

(k

Frame size - - - * ** 145T 182T 184T 213T - - -

Shaft dia. in - - - * ** 7/8 1-1/8 1-1/8 1-3/8 - - -

Max. weight, lb

(kg)

Frame size----143T 145T 182T 184T 213T 215T 254T -

Shaft dia. in----7/87/81-1/81-1/81-3/81-3/81-5/8-

Max. weight, lb

(kg)

Frame size---- 145T 182T 184T 213T 215T 254T -

Shaft dia. in---- 7/81-1/81-1/81-3/81-3/81-5/8-

Max. weight, lb

(kg)

Frame size-------184T 213T 215T 254T 256T

Shaft dia. in-------1-1/81-3/81-3/81-5/81-5/8

Max. weight, lb

(kg)

Frame size-------184T 213T 215T 254T 256T

Shaft dia. in-------1-1/81-3/81-3/81-5/81-5/8

143T frame and 7/8" shaft diameter for 3-ph motors
** 56/56H frame and 5/8" shaft diameter for 1-ph motors

143T frame and 7/ 8" sh aft diamet er for 3-ph m otor s
*** Refer to “HP range” in Table 18, page 32 for applicable motors per unit size

0.33 0.5 0.75 1 1.5 2 3 5 7.5 10 15 20

25

(11.33)

25

(11.33)

25

(11.33)

--

---

---

----

----

-------

-------

27

(12.25)

27

(12.25)

27

(12.25)

27

(12.25)

27

(12.25)

27

(12.25)

27

(12.25)

40

(18.41)

40

(18.41)

40

(18.41)

40

(18.41)

40

(18.41)

40

(18.41)

Fan motor size – horsepower (hp)

44

(19.96)

44

(19.96)

44

(19.96)

44

(19.96)

44

(19.96)

44

(19.96)

44

(19.96)

46

(20.87)

46

(20.87)

46

(20.87)

46

(20.87)

46

(20.87)

46

(20.87)

46

(20.87)

46

(20.87)

------

69

(31.30)

69

(31.30)

69

(31.30)

69

(31.30)

69

(31.30)

69

(31.30)

69

(31.30)

85

(38.55)

85

(38.55)

85

(38.55)

85

(38.55)

85

(38.55)

85

(38.55)

85

(38.55)

85

(38.55)

85

(38.55)

Physical Data

----

----

----

129

(58.51)

129

(58.51)

129

(58.51)

129

(58.51)

129

(58.51)

129

(58.51)

---

---

129

(58.51)

129

(58.51)

129

(58.51)

129

(58.51)

217

(98.43)

217

(98.43)

217

(98.43)

217

(98.43)

-

-

259

(117.48)

259

(117.48)

McQuay IM 782-7 31

Physical Data

Fan Data

Table 17: Forward Curved Fan Data

Fan data

Fan type
Diameter 7/7 9/9 9/9 10/10 12/12 12/12 10/10 12/12 15/15 15/15

HP range .50–2 .50–3 .5–5 .75–5 1–5 1–7.5 2–15 3–15 5–20 5–20

cfm minimum—fan

limit

cfm maximum—fan

limit

Maximum rpm 2,680 2,650 2,650 2,100 1,700 1,700 2,100 1,700 1,500 1,500

Class 1111111111

Motor sheave

Fan sheave AK, BK AK, BK AK, BK AK, BK AK, BK AK, BK AK, BK AK, BK AK, BK AK, BK

Belt

Fan shaft diameter 3/4" 3/4" 3/4" 3/4" 1.0" 1 .0" 3/4" 1.0" 1.0" 1.0"

Weight—lbs (kg)

002 003 004 005 007 010 015 020 025 030

DWDI

FC

206 206 529 529 765 765 1059 1529 2118 2118

2,088 2,088 5,765 6,176 8,529 8,529 12,353 17,059 26,706 26,706

VP, VL, VMVP, VL, VMVP, VL, VMVP, VL, VMVP, VL, VMVP, VL, VMVP, VL, VMVP, VL, VMVP, VL, VMVP, VL,

A, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B, BXA, AX, B,

19.03
(8.63)

DWDI FCDWDI FCDWDI FCDWDI

33.95

(15.40)

33.95

(15.40)

41.45

(18.80)

Table 18: Plenum Fan Data

Fan data

Fan type

Diameter (in) 9 10 11 12.5 14 16 20 22 25 25

HP range 1.5–2 1.5–5 1–5 1–5 1–7.5 1–7.5 1.5–15 2–15 5–20 5–20

cfm minimum—fan

limit

cfm maximum—fan

limit

Maximum rpm 5175 5175 4245 4245 3600 2625 2265 2310 2060 2060

Weight with smallest

motor—lbs (kg)

Weight with largest

motor—lbs (kg)

002 003 004 005 007 010 015 020 025 030

SWSI DD

Plenum

100 150 200 200 250 325 525 650 800 800

1800 2650 4100 4100 5000 5200 9200 12,900 16,150 16,150

50 (22.7) 57 (25.9) 59 (26.8) 62 (28.1) 71 (32.2) 86 (39)

56 (25.4) 84 (38.1) 86 (39) 89 (40.4)

SWSI DD

Plenum

SWSI DD

Plenum

SWSI DD

Plenum

Unit size

FC

60.85

(27.60)

Unit size

SWSI DD

Plenum

114

(51.7)

DWDI

FC

60.85

(27.60)

SWSI DD

Plenum

154

(69.9)

Twin

DWDI FC

79.37

(36.00)

SWSI DD

Plenum

147

(66.7)

281

(127.4)

Twin

DWDI FC

126.77

(57.50)

SWSI DD

Plenum

176

(79.8)

312

(141.5)

Twin

DWDI FC

154.87
(70.25)

SWSI DD

Plenum

263

(119.3)

363

(164.7)

Twin

DWDI FC

VM

BX

154.87

(70.25)

SWSI DD

Plenum

263

(119.3)

363

(164.7)

Filter Data

Table 19: Filter Data

Filter data

Flat filter bank

number

Flat filter (qty)

size

Flat filter

depth options

002 003 004 005 007 010 015 020 025 030

1111112222

(1) 16 × 25 (1) 18 × 24 (2) 16 × 20 (2) 20 × 24 (2) 24 × 24 (3) 20 × 25

2", 4" 2", 4" 2", 4" 2", 4" 2", 4" 2", 4" 2", 4" 2", 4" 2", 4" 2", 4"

Angular filters

Angular filter

bank number

Angular filter

(qty) size

Angular filter

depth options

1112222333

(1) 20 × 24 (2) 16 × 20 (2) 20 × 20 (4) 16 × 20 (4) 16 × 25 (6) 16 × 20 (6) 20 × 24 (9) 20 × 24

2" 2" 2" 2" 2" 2" 2" 2" 2" 2"

32 McQuay IM 782-7

Unit size

Flat filters

(3) 12 × 24
(3) 24 × 24

(6) 24 × 24

(4) 20 × 24
(4) 24 × 24

(6) 20 × 24
(6) 24 × 24

(6) 16 × 25
(4) 20 × 25

(6) 20 × 24
(6) 24 × 24

Physical Data

Coil Data

Table 20: Coil Data—Chilled Water

Chilled

water coil

data

Fin height 14 16 16 22 22 26 32.5 45 45 52.5

Fin length 21 27 34 34 48 54 65 65 80 80

Rows 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6

FPI12121212121212121212

Connection

material

Connection

size 4-row

Connection

size 6-row

Casing Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS

002 003 004 005 007 010 015 020 025 030

Copper

sweat

0.875 OD 1.125 OD 1.625 OD 1.625 OD 1.625 OD 1.625 OD 1.5 NPT 2.5 NPT 2.5 NPT 2.5 NPT

0.875 OD 1.125 OD 1.625 OD 1.625 OD 1.625 OD 2.125 OD 2.0 NPT 2.5 NPT 2.5 NPT 2.5 NPT

Copper

sweat

Copper

sweat

Copper

sweat

Table 21: Coil Data—DX Coils

DX coils

data

Fin height 14 16 16 22 22 26 32.5 45 45 52.5
Fin length21273434485465658080

Rows 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6 4, 6

FPI12121212121212121212

Connection

material

Suction

Connection

size
4-row
Liquid

Connection

size 4-row

Suction

Connection

size
6-row
Liquid

Connection

size 6-row

Casing Galv./SS. Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS

Number of

circuits

Circuit type Normal Normal Normal Normal Normal Normal Face split Face split Face split Face split

002 003 004 005 007 010 015 020 025 030

Copper

sweat

0.875 OD 1.125 OD 1.125 OD 1.125 OD 1.625 OD 1.625 OD 1.625 OD 1.625 OD 1.625 OD 1.625 OD

0.625 OD 0.625 OD 0.625 OD 0.875 OD 0.875 OD 1.125 OD 0.625 OD 0.875 OD 1.125 OD 1.125 OD

0.875 OD 1.125 OD 1.625 OD 1.625 OD 1.625 OD 2.125 OD 1.625 OD 1.625 OD 2.125 OD 2.625 OD

0.625 OD 0.625 OD 0.625 OD 1.125 OD 1.125 OD 1.125 OD 0.875 OD 0.875 OD 1.125 OD 1.375 OD

1111112222

Copper

sweat

Copper

sweat

Copper

sweat

Copper

sweat

Unit size

Copper

sweat

Unit size

Copper

Copper

sweat

sweat

Steel

NPT

Copper

sweat

Steel

NPT

Copper

sweat

Steel
NPT

Copper

sweat

Steel

NPT

Copper

sweat

Table 22: Coil Data—Hot Water Coils

Hot water

coil data

Fin height 14 16 16 22 22 26 32.5 45 45 52.5
Fin length 21 27 34 34 48 54 65 65 80 80

Rows 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2

FPI12121212121212121212

Connection

material

Connection

size 1-row

Connection

size 2-row

Casing Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS Galv./SS

002 003 004 005 007 010 015 020 025 030

Copper

sweat

.625 OD .625 OD .875 OD .875 OD 1.125 OD 1.375 OD 1.0 NPT 1.5 NPT 1.5 NPT 2.0 NPT

.875 OD .875 OD 1.125 OD 1.125 OD 1.625 OD 1.625 OD 1.5 NPT 2.0 NPT 2.0 NPT 2.0 NPT

Copper

sweat

Copper

sweat

Copper

sweat

Unit size

Copper

sweat

Copper

sweat

Steel

NPT

Steel

NPT

Steel

NPT

Steel

NPT

McQuay IM 782-7 33

Physical Data

Drain Pan Data

Table 23: Drain Pan Connections

Standard

and optional

stainless

002 003 004 005 007 010 015 020 025 030

steel

Arrangement Sloped Sloped Sloped Sloped Sloped Sloped Sloped Sloped Sloped Sloped

Connection size

- Main

Connection size

- Secondary

1" ID MPT 1" ID MPT 1" ID MPT 1" ID MPT 1" ID MPT 1" ID MPT

1/2" ID

MPT

1/2" ID

MPT

1/2" ID

MPT

1/2" ID

MPT

Electric Heat Data

Table 24: Electric Heat Data for Unit Sizes

Unit size # Stages

002

003

004

005

007

010

1 1.5 - 4.5 1.5 - 8 1.5 - 9 1.5 - 10 1.5 - 10 1.5 - 10 1.5 - 10
2 4 - 9 4 - 9 4 - 10 4 - 10 4 - 10 4 - 10 4 - 10
1 2.5 - 4.5 2.5 - 8 2.5 - 9 2.5 - 13 2.5 - 15 2.5 - 20 2.5 - 20
2 4 - 9 4 - 16 4 - 20 4 - 20 4 - 20 4 - 20 4 - 20
3 10 - 13 15 - 20 15 - 20 15 - 20 15 - 20 15 - 20 15 - 20
4 14 - 18 20 20 20 20 20 20
1 2.5 - 4.5 2.5 - 8 2.6 - 9 2.5 - 13 2.5 - 15 2.5 - 20 2.5 - 20
2 4 - 9 4 - 16 4 - 18 4 - 20 4 - 20 4 - 20 4 - 20
3 9.5 - 13 15 - 20 15 - 20 15 - 20 15 - 20 15 - 20 15 - 20
4 14 - 18 20 20 20 20 20 20
1 4 - 4.5 4 - 8 4 - 9 4 - 13 4 - 15 4 - 24 4 - 26
2 4 - 9 4 - 16 4 - 18 4 - 26 4 - 26 4 - 26 4 - 26
3 10 - 13 15 - 24 15 - 26 15 - 26 15 - 26 15 - 26 15 - 26
4 14 - 18 20 - 26 20 - 26 20 - 26 20 - 26 20 - 26 20 - 26
1 NA 6 - 8 6 - 9 6 - 13 6 - 15 6 - 20 6 - 20
2 6 - 9 6 - 16 6 - 18 6 - 26 6 - 30 6 - 36 6 - 36
3 10 - 13 15 - 24 15 - 26 15 - 38 15 - 38 15 - 38 15 - 38
4 14 - 18 20 - 32 20 - 36 20 - 38 20 - 38 20 - 38 20 - 38
1 NA 6 - 8 6 - 9 6 - 13 6 - 13 6 - 19 6 - 19
2 6 - 9 6 - 16 6 - 18 6 - 26 6 - 30 6 - 36 6 - 36
3 10 - 13 15 - 24 15 - 26 15 - 40 15 - 45 15 - 55 15 - 55
4 14 - 18 20 - 32 20 - 36 20 - 55 20 - 55 20 - 55 20 - 55

120/1/60 208/1/60 240/1/60 208/3/60 240/3/60 480/3/60 600/3/60

Voltage/kW Range

Unit size

1/2" ID

MPT

1/2" ID

MPT

1-1/4" ID

MPT

1/2" ID

MPT

1-1/4" ID

MPT

1/2" ID

MPT

1-1/4" ID

MPT

1/2" ID

MPT

1-1/4" ID

MPT

1/2" ID

MPT

34 McQuay IM 782-7

Fan Curves

Figure 32: 9.0" SWSI - Backward Inclined Pl enum Supply Fan at Standard Conditions

Fan Curves

Figure 33: 10.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

McQuay IM 782-7 35

Fan Curves

Figure 34: 11.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

Figure 35: 12.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

36 McQuay IM 782-7

Figure 36: 14.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

Fan Curves

Figure 37: 16.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

McQuay IM 782-7 37

Fan Curves

Figure 38: 20.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

Figure 39: 22.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

38 McQuay IM 782-7

Figure 40: 25.0" SWSI - Backward Inclined Plenum Supply Fan at Standard Conditions

Fan Curves

McQuay IM 782-7 39

Dimensional Data

Length

Height

Width

Width

Front View

Side View

Top View

Dimensional Data

Cabinet Dimensions—Horizontal

Table 25: Cabinet Dimensions—Horizo nt al Unit

28.35
(720)

56.50

(1435)

58.86

(1495)

70.08

(1780)

65.55

(1665)

76.77

(1950)

49.80

(1265)

61.02

(1550)

49.80

(1265)

61.02

(1550)

15.51
(394)

13.46
(342)

Unit size

32.48
(825)

63.00

(1600)

58.86

(1495)

70.08

(1780)

65.55

(1665)

76.77

(1950)

49.80

(1265)

61.02

(1550)

49.80

(1265)

61.02

(1550)

15.51
(394)

13.46
(342)

39.37

(1000)

74.41

(1890)

53.74

(1365)

64.37

(1635)

62.80

(15.95)

73.42

(18.65)

52.56

(1335)

63.19

(1605)

52.56

(1335)

63.19

(1605)

2 x 13.07*

(332)

2 x 11.34*

(288)

Dimension/

Configuration

002 003 004 005 007 010 015 020 025 030

Cabinet Dimension Unit height and width dimensions in. (mm)

Height

Width

20.47
(520)

28.54
(725)

22.44
(570)

34.84
(885)

22.44
(570)

42.52

(1080)

28.35
(720)

42.52

(1080)

Configuration Unit length dimensions in. (mm)

Cooling only or

cooling with
reheat coils

Cooling with

preheat coils

Heating only

Ventilation only

Discharge Opening

Dimension

Height

Width

Note: * Twin openings

Flat

filter

Angular

filter

Flat

filter

Angular

filter

Flat

filter

Angular

filter

Flat

filter

Angular

filter

47.84

(1215)

58.27

(1480)

51.97

(1320)

62.40

(15.85)

39.96

(1015)

50.39

(1280)

39.96

(1015)

50.39

(1280)

9.17

(233)

8.74

(222)

47.84

(1215)

55.12

(1400)

51.97

(1320)

59.25

(1505)

39.96

(1015)

47.24

(1200)

39.96

(1015)

47.24

(1200)

11.77
(299)

10.20
(259)

53.35

(1355)

60.63

(1540)

59.25

(15.05)

66.53

(1690)

45.47

(1155)

52.76

(1340)

45.47

(1155)

52.76

(1340)

11.77
(299)

10.20
(259)

54.72

(1390)

65.95

(1675)

59.45

(15.10)

70.67

(17.95)

45.67

(1160)

56.89

(1445)

45.67

(1160)

56.89

(1445)

Unit height and width dimensions in. (mm)

13.07
(332)

11.34
(288)

Figure 41: Horizontal Unit Dimensions

51.57

(1310)

75.00

(1905)

56.30

(1430)

71.26

(1810)

65.35

(1660)

80.32

(2040)

55.51

(1410)

70.47

(1790)

55.51

(1410)

70.47

(1790)

2 x 15.51*

(394)

2 x 13.46*

(342)

51.57

(1310)

89.96

(2285)

62.00

(1575)

76.97

(1955)

69.09

(17.55)

84.06

(2135)

61.42

(1560)

76.38

(1940)

61.42

(1560)

76.38

(1940)

2 x 18.54*

(471)

2 x 15.83*

(402)

59.06

(1500)

89.96

(2285)

62.00

(1575)

80.12

(2035)

69.09

(17.55)

87.20

(2215)

61.42

(1560)

79.53

(2020)

61.42

(1560)

79.53

(2020)

2 x 18.54*

(471)

2 x 15.83*

(402)

40 McQuay IM 782-7

Table 26: Cabinet Dimensions—Horizontal Unit with Plenum Fan

Dimension/

Configuration

002 003 004 005 007 010 015 020 025 030

Unit size

Cabinet Dimension Unit height and width dimensions in. (mm)

Height

Width

20.47
(520)

28.54
(725)

22.44
(570)

34.84
(885)

22.44
(570)

42.52

(1080)

28.35
(720)

42.52

(1080)

28.35
(720)

56.50

(1435)

32.48
(825)

63.00

(1600)

39.37

(1000)

74.41

(1890)

Configuration Unit length dimensions in. (mm)

Cooling only or

cooling with

reheat coils

Cooling with

preheat coils

Heating only

Ventilation only

Angular

Angular

Angular

Angular

Discharge Opening

Dimension

Height

Width

Flat

filter

filter

Flat

filter

filter

Flat

filter

filter

Flat

filter

filter

47.83

(1215)

58.27

(1480)

51.97

(1320)

62.40

(15.85)

39.96

(1015)

50.79

(1290)

39.96

(1015)

50.79

(1290)

18.11
(460)

26.18
(665)

53.94

(1370)

61.42

(1560)

58.27

(1480)

65.55

(1665)

46.06

(1170)

53.54

(1360)

46.06

(1170)

53.54

(1360)

20.08
(510)

32.48
(825)

59.45

(1510)

66.54

(1690)

62.99

(1600)

70.08

(1780)

51.57

(1310)

58.66

(1490)

51.57

(1310)

58.66

(1490)

62.01

(1575)

73.03

(1855)

66.73

(1695)

77.76

(1975)

52.95

(1345

63.98

(1625)

52.95

(1345)

63.98

(1625)

70.08

(1780)

81.50

(2070)

76.77

(1950)

88.19

(2240)

61.02

)

(1550)

72.44

(1840)

61.02

(1550)

72.44

(1840)

70.08

(1780)

81.50

(2070)

76.77

(1950)

88.19

(2240)

61.02

(1550)

72.44

(1840)

61.02

(1550)

72.44

(1840)

Unit height and width dimensions in. (mm)

20.08
(510)

40.16

(1020)

25.98
(660)

40.16

(1020)

25.98
(660)

54.13

(1375)

30.11
(765)

60.63

(1540)

70.87

(1800)

81.50

(2070)

79.92

(2030)

90.55

(2300)

69.69

(1770)

80.31

(2040)

69.69

(1770)

80.31

(2040)

37.00
(940)

72.05

(1830)

Dimensional Data

51.57

(1310)

75.00

(1905)

78.35

(1990)

93.31

(2370)

87.40

(2220)

102.36
(2600)

77.56

(1970)

92.52

(2320)

77.56

(1970)

92.52

(2320)

49.21

(1250)

72.64

(1845)

51.57

(1310)

89.96

(2285)

88.54

(2250)

103.54
(2630)

95.67

(2430)

110.63
(2810)

88.19

(2240)

103.15
(2620)

88.19

(2240)

103.15
(2620)

49.21

(1250)

87.60

(2225)

59.06

(1500)

89.96

(2285)

88.54

(2250)

106.69
(2710)

95.67

(2430)

95.67

(2430)

88.19

(2240)

105.91
(2690)

88.19

(2240)

105.91
(2690)

56.69

(2225)

87.60

(2225)

Figure 42: Horizontal Unit Dimensions

McQuay IM 782-7 41

Dimensional Data

Front View Side View

Top View

Width

Length

Height

Height

Height

Width

Cabinet Dimensions—Vertical

Table 27: Cabinet Dimensions —Vertical Unit

Dimensions

Cabinet

Dimension

Width—in (mm)

Length—in (mm)

Upper section

height—in (mm)

Lower section

height—in (mm)

Discharge

Opening

Dimensions

Height—in (mm)

Width—in (mm)

Note: * Twin openings

Figure 43: Vertical Unit Dimensions

002 003 004 005 007 010 015 020 025 030

Unit height, length, and width dimensions in. (mm)

28.54
(725)

29.92
(760)

17.13
(435)

20.47
(520)

9.17

(233)

8.74

(222)

34.84
(885)

33.07
(840)

19.88
(505)

22.44
(570)

11.77

(299)

10.20

(259)

42.52

(1080)

33.07
(840)

19.88
(505)

22.44
(570)

11.77
(299)

10.20
(259)

Unit size

42.52

(1080)

36.42
(925)

22.05
(560)

28.35
(720)

56.50

(1435)

39.96

(1015)

24.61
(625)

28.35
(720)

62.99

(1600)

39.96

(1015)

24.61
(625)

32.48
(825)

74.41

(1890)

42.72

(1085)

23.82
(605)

39.37

(1000)

Unit height and width dimensions in. (mm)

13.07
(332)

11.34
(288)

15.51
(394)

13.46
(342)

15.51
(394)

13.46
(342)

13.07*
(332)

11.34
(288)

75.00

(1905)

47.83

(1215)

26.97
(685)

51.57

(1310)

15.51*
(394)

13.46
(342)

89.96

(2285)

51.18

(1300)

31.30
(795)

51.57

(1310)

18.54*
(471)

15.83
(402)

89.96

(2285)

51.18

(1300)

31.30
(795)

59.06

(1500)

18.54*
(471)

15.83
(402)

42 McQuay IM 782-7

Mixing Box Dimensions

Table 28: Mixing Box Dimensions—Horizontal and Vertical Units

Unit size

002

003

004

005

007

010

015

020

025

030

W H L W1 L1 Area (ft2)

28.54
(725)

34.84
(885)

42.52

(1080)

42.52

(1080)

56.50

(1435)

62.99

(1600)

74.41

(1890)

75.00

(1905)

89.96

(2285)

89.96

(2285)

Cabinet in. (mm) Damper in. (mm)

20.47
(520)

22.44
(570)

22.44
(570)

28.35
(720)

28.35
(720)

32.48
(825)

39.37

(1000)

51.57

(1310)

51.57

(1310)

59.06

(1500)

10.24
(260)

10.24
(260)

10.24
(260)

14.17
(360)

14.17
(360)

14.17
(360)

18.11
(460)

25.98
(660)

25.98

660)

(

29.92

(760)

26.18
(665)

32.48
(825)

40.16

(1020)

40.16

(1020)

54.13

(1375)

60.63

(1540)

72.05

(1830)

72.64

(1845)

87.60

(2225)

87.60

(2225)

Dimensional Data

7.87

(200)

7.87

(200)

7.87

(200)

11.81
(300)

11.81
(300)

11.81
(300)

15.75
(400)

23.62
(600)

23.62
(600)

27.56
(700)

1.43

1.78

2.20

3.29

4.44

4.97

7.88

11.92

14.37

16.76

Figure 44: Mixing Box DImensions

McQuay IM 782-7 43

Dimensional Data

H

Left Hand

Right Hand

NOTE: Heaters are not intended to be installed with less than 20" of straight duct at the outlet of the heater.

Electric Heat Dimensions—Left/Right Oriented

Table 29: Electric Heat Dimensions - in. (mm), Sizes 002 through 004

Dimension

-in. (mm)

002 003 004

1 Step 2 Steps 1Step 2 Steps 3 Steps 4 Steps 1Step 2 Steps 3 Steps 4 Steps

A 9-1/2 (241) 9-1/2 (241) 9-1/2 (241) 9-1/2 (241) 9-1/2 (241) 9-1/2 (241) 9-1/2 (241) 9-1/2 (241)

B 20 (508) 20 (508)

C

D 8-3/4 (222) 8-3/4 (222)
E 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19)
F 10 (254) 10 (254)

G 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19)

H 9-1/4 (235) 9-1/4 (235) 12 (305) 12 (305) 12 (305) 12 (305) 12 (305) 12 (305) 12 (305) 12 (305)

11-1/2

(292)

16 (406)

22-1/4

(565)

11-1/2

(292)

10-3/8

(264)

12-3/4

(324)

22-1/4

(565)

16 (406) 20 (508) 24 (610)

10-3/8

(264)

12-3/4

(324)

Table 30: Electric Heat Dimensions - in. (mm), Sizes 005 through 010

Dimension

- in. (mm)
1Step

A

B

C

D
E 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19)

F
G 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19) 3/4 (19)
H

9-1/2
(241)

23-1/2

(597)

11-1/2

(292)

11-3/8

(289)

14

56)14(356)

(3

13-1/4

(337)

005 007 010

2

Steps3 Steps4 Steps

9-1/2
(241)

23-1/2

(597)

16

(406)

11-3/8

(289)

13-1/4

(337)

9-1/2
(241)

23-1/2

(597)

20

(508)

11-3/8

(289)

14

(356)

13-1/4

(337)

9-1/2
(241)

23-1/2

(597)

24

(610)

11-3/8

(289)

14

(356)

13-1/4

(337)

1Step

9-1/2
(241)

25

(635)

11-1/2

(292)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

Unit Size

22-1/4

(565)

10-3/8

(264)

12-3/4

(324)

22-1/4

(565)

10-3/8

(264)

12-3/4

(324)

Unit Size

2

Steps3 Steps4 Steps

9-1/2
(241)

25

(635)

16

(406)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

9-1/2
(241)

25

(635)

20

(508)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

9-1/2
(241)

25

(635)

24

(610)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

22-1/4

(565)

11-1/2

(292)

10-3/8

(264)

12-3/4

(324)

9-1/2

(241)

22-1/4

(565)

16 (406) 20 (508) 24 (610)

10-3/8

(264)

12-3/4

(324)

1Step

9-1/2
(241)

25

(635)

11-1/2

(292)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

22-1/4

(565)

10-3/8

(264)

12-3/4

(324)

2

Steps3 Steps4 Steps

9-1/2
(241)

25

(635)

16

(406)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

9-1/2
(241)

(635)

(508)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

25

20

9-1/2
(241)

22-1/4

(565)

10-3/8

(264)

12-3/4

(324)

9-1/2
(241)

25

(635)

24

(610)

13-1/2

(343)

16-1/2

(419)

15-3/4

(400)

Figure 45: Electric Heat Dimensions

44 McQuay IM 782-7

Control Box Dimensions

Table 31: Control Box Dimensions – Left and Right Hand Access

Dimension/

Configuration

Disconnect/Starter/

Transformer

Width

Depth

Height

Disconnect Only/

Left Hand Access Only

Width

Depth

Height

Figure 46: Control Box Dimensions

002 003 004 005 007 010 015 020 025 030

8

(203)

6

(152)

18

(407)

7

(178)

5

(125)

15

(378)

8

(203)

6

(152)

18

(407)

7

(178)

5

(125)

15

(378)

8

(203)

6

(152)

18

(407)

7

(178)

5

(125)

15

(378)

8

(203)

6

(152)

18

(407)

7

(178)

5

(125)

15

(378)

Unit size

Dimensions in. (mm)

8

(203)

6

(152)

18

(407)

8

(203)

6

(152)

18

(407)

Dimensions in. (mm)

7

(178)

5

(125)

15

(378)

9

(223)

6.5

(162)

17.5

(444)

Dimensional Data

12

(305)

6

(152)

16

(415)

9

(223)

6.5

(162)

17.5

(444)

12

(305)

6

(152)

16

(415)

9

(223)

6.5

(162)

17.5

(444)

12

(305)

6

(152)

16

(415)

9

(223)

6.5

(162)

21.3

(540)

12

(305)

6

(152)

16

(415)

9

(223)

6.5

(162)

21.3

(540)

McQuay IM 782-7 45

Operation Guidelines

Operation Guidelines

St artup Checks

When performing startup and service, always take thorough
safety precautions. Start-up functions must be performed by
trained, experienced personnel.

WARNING

ROTATING FAN.

Can cause severe injury or death. Before servicing fans, lockout
and tag out power.

AVERTISSEMENT

PIÈCES MOBILES DANGEREUSES.

Avant de réparer ou entretenir les ventilateurs, coupez
l’alimentation èlectrique de cet appareil et bloquez le
commutateur à OFF.

WARNING

FIRE/ELECTRIC SHOCK HAZARD.

Can cause property damage, personal injury or death. Wire fan
power supply and ground motor frame in accordance with local
electric codes.

AVERTISSEMENT

Risques d’incendie et d’électrocution pouvant causer des
dommages matériels, des blessures et même la mort.

L’alimentation électrique du moteur du ventilateur de même
que la mise à la terre du chàssis du moteur doivent être faits
conformément aux codes d’installations électriques en vigueur.

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 et d’électrocution pouvant causer des
dommages matériels, des blessures et même la mort.

Connecter au moteur du ventilateur électrique un dispositif de
protection contre les surcharges conforme aux codes
d'installations électriques en vigueur.

CAUTION

DO NOT OVERHEAT FAN MOTOR.

High air temperatures in the fan section can cause the fan
motor to burnout. On draw-through air handlers or air handlers
with the fan section down the air stream from the heating
section, the discharge air temperature of the heating section
must not exceed 104°F (40°C).

ATTENTION

Risques de dommages dans le moteur du ventilateur
électrique. Si Ia température de l’air a proximité du

ventilateurest élevée, le moteurdu ventilateur électrique peut
chauffer et brûler. Sur les transmetteurs d’air à circulation
transversale ou les transmetteurs dont le ventilateur est en aval
de l’unité de chauffage, régler la température de l’air sortant de
l’unité de chauffage à 40°C (104°F).

Before Starting the Unit

Make sure that fan electrical power source is disconnected and
locked in the OFF position before entering fan section.

1 With ductwork connected, check the unit for complete

and proper installation.

2 Check that all construction debris is removed and filters

are clean.

3 Check that all electrical work is complete and properly

terminated. Check that all electrical connections are tight
and that the proper voltage is connected. Phase
imbalance must not exceed 2%.

4 Ball bearings on fan shaft and motor are prelubricated

and do not need grease before startup.

5 Check tightness of setscrews in bearings and fan

wheel(s). If retightening is needed, make certain the fan
wheel(s) are aligned properly or setscrews are torqued

per Table 37, page 51.

CAUTION

Equipment damage due to loose fasteners represents
improper start-up and equipment abuse. It is not covered by
the warranty.

ATTENTION

Des dommages causés à l’unité dû à des attaches mal
serrées signifie que le démarrage a été inadéquat et
constitue un usage abusif de l’équipement. Ceci n’est pas
couvert par la garantie.

6 Check alignment of fan and motor sheaves and belt

tension. Adjust if necessary. Check tightness of sheave
setscrews and/or capscrews. See Figure 48, page 49 and

Figure 49, page 50 and Figure 50, page 50.

7 Leak test the thermal system to verify that connections

are tight.

46 McQuay IM 782-7

Operation Guidelines

8 Check that condensate drain is trapped.
9 Rotate shaft by hand to be sure it is free.

10 Fan startup: Fan should start and run. Observe the

rotation. If the fan is operating backward, reverse two
legs of the three-phase supply power.

Note: Variable pitch fan drives are usually provided for

operation in the mid-speed adjustment range. However,
the drives usually ship with the adjustment opened for
minimum fan speed. Adjust the drives for the proper
airflow. Refer to Fan Drive Adjustments‚ page 48.

After first 48 hours of operation:

1 Disconnect and lockout electrical power source.
2 Check tightness of all bearing, wheel, and sheave

setscrews (or capscrews). See Table 32.

3 Recheck belt tension and adjust if necessary. Belts

tensioned sufficiently to slip one to two seconds at
startup will perform satisfactorily, extending life and
reducing vibration. If retensioning is necessary, be

certain to retain sheave alignment.

Table 32: Bearing Collar and Wheel Hub Setscrew Torque

Setscrew Minimum torque

Diameter (inches) ft / lbs kg / M

1/4 5.5 .76

1/16 10.5 1.45

3/8 19.0 2.63

7/16 29.0 4.01

Operating Limits

Do not exceed the operating limits in Table 33 and Table 34. A
fan wheel that is operated beyond the rpm and temperature
limits shown may suffer permanent distortion or fracture. The
resulting unbalance may cause severe unit vibration.

Table 33: Forward Curved Fan Operating Limits

Forward curved—housed

Dia.

(in)

Max. rpm 2680 2650 2100 1700 2100 1700 1500

Table 34: Backward Inclined Plenum Fan Operating Limits

Dia.

(in)

Max.

rpm

7- 7 9 - 9 10 - 10 12 - 12

Backward inclined —plenum

9 101112.514161820222528

5940 5350 4775 4245 3765 3340 2970 2675 2310 2060 1840

Twin

10"

Twin

12"

Twin

15"

For units with direct drive plenum fans employing variable
frequency drives, use the formula below to calculate the
maximum allowable frequency associated with the maximum
allowable fan speed.

F

= 60 Hz * (W

max

- maximum frequency allowable for particular

F

max

max

/ W

motor

)

application (Hz)

- maximum fan speed (rpm); refer to fan curves

W

max

(Figure 32 through Figure 40)

W

- nominal motor speed (1800/3600 rpm); refer to

motor

motor nameplate

Fan Vibration Levels

Each unit as shipped is trim balanced to operate smoothly. To
provide satisfactory operation after shipping and installation,
use the accepted industry guidelines for field balancing fans.
Vibration  0.20 in/sec.

Note: Excessive vibration from any cause contributes to

premature fan and motor bearing failure. Monitor overall
vibration levels every six months of operation. An
increase in levels is an indication of potential trouble.

Vibration Causes

1 Wheel imbalance

a Dirt or debris on wheel blades
b Loose setscrews in wheel hub or bearing-to-shaft

c Wheel distorted from overspeed
2 Bent shaft
3 Drive faulty

a Variable pitch sheaves—Axial and radi al runout of

flanges, uneven groove spacing, out of balance. Also
similar faults in driven sheave.

b Bad V-belts, lumpy or mismatched, belt tension too

tight or too loose

4 Bad bearings, loose bearing hold-down bo lt s
5 Motor imbalance
6 Fan section not supported evenly on foundation

McQuay IM 782-7 47

Service and Maintenance

Grease
(one each side
of fan shaft)

fitting

Service and Maintenance

Periodic Service and Maintenance

1 Check all moving parts for wear every six months.
2 Check bearing collar, sheave, and wheel hub setscrews,

sheave capscrews, and bearing hold-down bolts for
tightness every six months.

Ball Bearing Lubrication

1 Motor bearings—All ball bearings are prelubricated and

do not require additional grease during installation.
However, periodic cleaning out and renewal of grease is
necessary. Exercise extreme care when cleaning to
prevent foreign matter from entering the bearing. It is
also important to avoid over greasing. Only use a high
grade, clean mineral grease with the following
characteristics.

a Melting point preferably over 302°F (150°C).
b Does not separate by oil and soap under operating and

storage conditions.

c Free of abrasive matter, acid, alkali, and moisture.
d Specific greasing instructions are located on a label

attached to the fan section door.

2 Fan shaft bearings—All ball bearings are prelubricated

and do not require additional grease during installation.
Periodic greasing is necessary. Bearings are accessible in
the fan section. A grease fitting is located on each side of
the fan shaft. Do not over lubricate. Wipe off any
excess grease to prevent overheating. The lubrication
interval varies with the period of operation and
temperature of the ambient air. Use the guidelines in the
table below:

Table 35: Bearing Operating Temperature Range

Bearing operating temperature range

Operation

Continuous operation 6 months 4 months 2 months

12-hr/day operation 12 months 12 months 6 months

Figure 47: Fan Shaft Bearing Grease Fitting

To 130°F

(54°C)

To 150°F

(66°C)

Over 150°F

(66°C)

Table 36: Lubricants Recommended for Fan Shaft Ball
Bearings

Manufacturer

Texaco Lubricants

Company

Keystone Ind. Lubricants 81EP-2 0 to 250 –18 to 121

Mobil Oil Corporation

Exxon Company, U.S.A. Ronex MP –40 to 300 –40 to 149

Shell Oil Company Alvania No. 2 –20 to 240 –29 to 116

Note: Note:Temperature ranges over 225°F are shown for lubricants only.

High temperature applications are not suitable for standard air
handler components.

Product

name

Premium RB –30 to 300 –34 to 149

Mobilith
SCH100

Temperature range

°F °C

–40 to 350 –40 to 177

Fan Drive Adjustments

WARNING

ROTATING FAN can cause severe injury or death. Before

servicing fans, lockout and tag out power.
Do not open the hinged access door and access panels while
the unit is operating. Moving parts and strong suction forces can
cause severe personal injury or death.
Before entering any fan section, make sure the electrical power
source to the fan motor is disconnected, locked out and tagged
out.

AVERTISSEMENT

PIÈCES MOBILES DANGEREUSES.

Avant de réparer ou entretenir les ventilateurs, coupez
l’alimentation èlectrique de cet appareil et bloquez le
commutateur à OFF.

Upon completion of the air balance, replace the variable
pitched motor sheave with a properly sized, fixed sheave. A
matching fixed sheave provides longer belt and bearing life
and vibration-free operation. Initially, it is best to have a
variable pitched motor sheave for the purpose of air balancing.
Once the balance is achieved, fixed sheaves maintain
balancing and alignment more effectively. Replace the
adjustable sheaves with fixed sheaves.

With the electrical power disconnected, locked and tagged out,
measure the diameter of the V-belt outer surface where it
passes around the sheave (pitch diameter). Calculate fan speed
from the motor nameplate rpm.

Fan rpm = Motor rpm ×

Measured diameter at motor sheave
Measured diameter at fan sheave

VM and VP Variable Pitch Key Type Sheaves

Mounting:

Mount all sheaves on the motor or driving shaft with the

1

setscrews

2 Verify that both driving and driven sheaves are in

A toward the motor.

alignment and that shafts are parallel.

48 McQuay IM 782-7

Service and Maintenance

Two groove

C

A

B

B

D

E

C

A

B

E

D

C

Single groove

Key E projects
to provide a grip
for removal.

3 Fit internal key D between sheave and shaft and lock

setscrew

Adjusting:

1 Loosen setscrews B and C in moving parts of sheave and

pull out external key

A securely in place.

E. (This key projects a small

amount to provide a grip for removing.)

2 Adjust sheave pitch diameter for desired speed by

opening moving parts by half or full turns from closed
position.

Do not open more than five full turns for
six full turns for

3 Replace external key E and securely tighten setscrews B

over key and setscrews

B belts.

C into keyway in fixed half of the

A belts or

sheave.

4 Put on belts and adjust belt tension.

Do not force belts over grooves. See “Fan Drive Belt
Adjustment” on page 28.

5 Make future adjustments by loosening the belt tension

and increasing or decreasing the pitch diameter of the
sheave by half or full turns as required. Readjust belt
tension before starting drive.

6 Adjust both halves of two-groove sheaves the same

number of turns from closed position to provide the same
pitch diameter.

7 Verify that all keys are in place and that all setscrews are

tight before starting drive. Check setscrews and belt
tension after 24 hours service.

Figure 48: VP Type Sheave Adjustment

LVP Variable Speed Sheaves

Mounting:

1 Slide sheave on motor shaft so that the side of the sheave

with setscrew

A is next to the motor, when setscrew A is

in the hub or barrel of the sheave.

2 When setscrew A is at an angle in the center flange B,

mount it away from the motor so the outer locking ring

and flange can be removed to get to the setscrew.

3 To remove the flange and locking ring:

a Loosen setscrews D.

b Loosen but do not remove capscrews E.

c Remove key F. (This key projects a small amount to

provide a grip for removing.)

d Rotate the flange counterclockwise until it disengages

the threads on the sheave barrel.

4 Verify that the driving and driven sheaves are in

alignment and the shafts are parallel. When aligning two-

groove sheaves, allow room between the sheave and

motor to get to capscrews

5 Insert key C between the sheave and the shaft and tighten

setscrew

6 If flange and locking ring have been removed, when

A securely.

E.

replacing them make sure that the inner and outer flanges

are open from the closed position by the same amount as

the other flange. Determine this by accurately measuring

the top width of the grooves.

7 Insert key F.
8 Tighten setscrews D and capscrews E.
9 Put on belts and adjust belt tension. Do not force belts

over grooves. See “Fan Drive Belt Adjustment” on page

28.

10 Be sure that all keys are in place and all setscrews and all

capscrews are tight before starting the drive. Check and

retighten all screws and retension belts after

approximately 24 hours of service.

Adjusting:

Slack off belt tension if belts have been installed.

1
2 Loosen setscrews D.
3 Loosen but do not remove capscrews E.
4 Remove key F. (This key projects out a small amount to

provide a grip for removing.)

5 Adjust pitch diameter by opening or closing the movable

flanges by half or full turns. (Two-groove sheaves are

supplied with both grooves set at the same pitch

diameter.) Move both movable flanges the same

number of turns to provide the same pitch diameter

for satisfactory operation. Do not open sheaves more

than five turns for

6 Replace key F.

A belts or six turns for B belts.

McQuay IM 782-7 49

Service and Maintenance

e

7 Tighten setscrews D and capscrews E.
8 If belts have been installed, readjust belt tension. If belts

have not been installed, install them and adjust belt
tension. Do not force belts over grooves. See Fan Drive

Belt Adjustment‚ page 52.

Figure 49: LVP Type Sheave Adjustment

A

E

C

F

D

E

D

Section A-A Section A-A

MVP Variable Speed Sheaves

Mounting:

1 Verify that both driving and driven sheaves are in

alignment and the shafts are parallel. The centerline of
the driving sheave must be in line with the centerline of
the driven sheave. See Sheave Adjustment.

2 Before starting drive, verify that all setscrews are

torqued to the values shown in Table 37, page 51. Check
setscrew torque and belt tension after 24 hours of
service.

9 Verify that all keys are in place and all setscrews and all

capscrews are tight before starting the drive. Check and
retighten all screws and retension belts after
approximately 24 hours of operation.

A

E

C

A

F

D

B

• Do not open

8V sheaves more than 8 turns.

6 Before operating the drive, tighten BOTH locking

A in the outer locking ring. Use a torque wrench

screws

A

and tighten to the value shown in Table 37, page 51.

7 Replace belts and adjust the motor base to tension the

belts properly . See Fan Drive Belt Adjustment‚ page 52.

8 Do not loosen any screws other than the two locking

A in the outer locking ring when adjusting the

screws
sheave pitch. Do not operate the drive until the locking
screws are set to the torque specifications.

Adjusting:

1 Adjust motor base forward to release belt tension. For

easier adjustment, remove the belts.

2 Loosen, but do not remove both of the locking setscrews

A in the outer locking ring by using a hex key or torque

wrench with a hex bit.

3 Adjust sheave to desired pitch diameter by turning the

outer locking ring. Use a spanner wrench or drift inserted
into the three holes that are located 120° apart on the
ring.

4 Any pitch diameter can be obtained within the sheave

range. One complete turn of the outer locking ring
changes the pitch diameter 0.233".

5 Do not open sheaves more than the following amounts:

• Do not open
belts or 6 turns for the

• Do not open

• Do not open

B sheaves more than 4 3/4 turns for the A

B belts.
C sheaves more than 9 1/2 turns.
5V sheaves more than 6 turns.

Figure 50: Sheave Adjustment

Must be
parallel

Bearing

Motor

Must be
parallel

Center lines
must coincid

Adjustable
sheave

50 McQuay IM 782-7

Service and Maintenance

Table 37: Screw Torque Values

Hollow head setscrews only

diameter

(2) Locking
setscrews A

For lengths (L) less than

diameter

Flathead socket screws
(Do not remove.)

Nominal screw

Socket head

cap screws

Flat head

socket screws

Lengths equal or greater than

size

(dia-thds/in)

Seating torque Seating torque Seating torque Seating torque Length (L) Seating torque

(in-lbs) (ft-lbs) (in-lbs) (in-lbs) (ft-lbs) (in) (in-lbs)

1/4-20NC 150 12.5 100 87 7.3 3/16 50

5/16-11NC 305 25.4 200 165 13.8 1/4 90

3/8-16NC 545 45.4 350 290 24.2 1/4, 5/16 150, 250
1/2-13NC 1300 108.3 N/A 620 51.7 N/A N/A
5/8-11NC N/A N/A N/A 1225 102.1 N/A N/A

Figure 51: Sheave Adjustment

Adjustable
center-flange

Split taper
bushing

Fixed
center-flange

Capscrews
(Do not remove.)

Stationary
end-flange

Outer

locking-ring

Inner locking-ring

(3) Holes for
spanner wrench
or drift

McQuay IM 782-7 51

Service and Maintenance

Fan Drive Belt Adjustment

General Rules of Te nsioning

1 The ideal tension is the lowest tension at which the belt

does not slip under peak load conditions.

2 Check tension frequently during the first 24 to 48 hours

of operation.

3 Over tensioning shortens belt and bearing life.
4 Keep belts free from foreign material, which may cause

slippage.

5 Make V-drive inspection on a periodic basis. Adjust

tension if the belt is slipping. Do not apply belt dressing.
This may damage the belt and cause early failure.

Tension Measurement Procedure

1 Measure the belt span. See Figure 52.
2 Place belt tension checker squarely on one belt at the

center of the belt span. Apply force to the checker,
perpendicular to the belt span, until the belt deflection
equals belt span distance divided by 64. Determine force
applied while in this position.

3 Compare this force to the values in Table 38.
4 Adjust to the minimum value. If the belts slip, add

tension.

Table 38: Belt Deflection Force

Sheave diameter (inches) Deflection force (lbs)/belt deflection force

Cross section

A, AX

B, BX

5V, 5VX

Smallest sheave

diameter range

3.0 to 3.6

3.8 to 4.8

5.0 to 7.0

3.4 to 4.2

4.4 to 5.6

5.8 to 8.6

4.4 to 6.7

7.1 to 10.9

11.8 to 16.0

rpm range

1000 to 2500 2.8 5.5 3.0 6.1
2501 to 4000 2.1 4.2 2.5 5.0
1000 to 2500 3.4 6.8 3.7 7.4
2501 to 4000 2.4 5.7 3.2 6.4
1000 to 2500 4.0 8.0 4.7 9.4
2501 to 4000 3.5 7.0 3.8 7.6

850 to 2500 — — 3.6 7.2

2501 to 4000 — — 3.1 6.2

860 to 2500 4.0 7.9 5.2 10.5

2501 to 4000 3.3 6.7 4.5 9.1

860 to 2500 4.7 9.4 6.3 12.6

2501 to 4000 4.5 8.9 5.4 10.9

500 to 1749 — — 7.6 15.2
1750 to 3000 — — 6.6 13.2
3001 to 4000 — — 4.2 8.5

500 to 1740 9.5 18.9 11.0 22.1
1741 to 3000 8.3 16.7 10.0 20.1

500 to 1740 11.7 23.4 12.7 25.5
1741 to 3000 10.5 21.8 12.5 25.0

Figure 52: Drive Belt Adjustment

Deflection =

B

el

Belt span

64

t

p

s

an

WARNING

Moving belt and fan can cause severe personal injury or death.
During installation and filter maintenance:

• Lock and tag out fans to prevent accidental start up.

• Do not enter the filter compartment until the fan is

completely stopped.

• Use approved equipment for reaching filters located above

normal reach. Do not step on filter frames or unit
components.

• Floor surfaces must be dry and free of oil or grease.

Cross section A, B, 5V Cross section AX, BX, 5VX

Min Max Min Max

52 McQuay IM 782-7

Service and Maintenance

Remove screws
from the upper track
that hold coil/drain pan
in place.

Lift drain pan connection
up and slide coil/drain pan
assembly out.

2

1

Airflow

Coil Maintenance

CAUTION

SHARP EDGES AND COIL SURFACES are a potential injury

hazard. Avoid contact with them.

ATTENTION

Les bords tranchants et les surfaces des bobines sont un
risque de blessure. Ne les touchez pas.

1 For maximum performance, the coil must be clean.

Check once a year under normal operating conditions
and brush or vacuum clean if necessary. Use a chemical
coil cleaner on multiple row coils. Read and follow the
chemical cleaner’s instructions since some cleaners may
contain harsh chemicals. Take care not to damage fins
while cleaning.

2 Drain pans in any air conditioning unit may have some

moisture. Algae and other organisms can grow due to
airborne spores and bacteria. Clean periodically to
prevent build-up from plugging the drain and causing the
drain pan to overflow. Keep drain pans clean to prevent
the spread of disease. Cleaning should be performed by
qualified personnel.

3 Dirt and lint can clog the condensate drain, especially

with dirty filters. Inspect twice a year to help avoid
overflow.

WARNING

Clean drain pan regularly so mold does not develop.

AVERTISSEMENT

Pour eviter la moisissure Nettoyer regulierement le bassin de
recuperage.

If fan replacement is required, the entire fan assembly can be
pulled out the side of the cabinet. The fan assembly includes
the fan housing, the bearing support, and the fan base.

1 To remove the fan assembly, remove the side panels

(follow instructions for side panel removal).

2 Disconnect the neoprene bulkhead seal that is attached to

the fan discharge. Then disconnect the fan sled from
each of the corner mounts and pull the entire assembly
out the side of the unit.

3 Loosen the fan bearings and pull out the shaft.

Disconnect the fan housing from the fan sled and bearing
support by removing the attaching bolts.

4 Replace the new fan, reconnect the shaft and bearings

and put the fan assembly in the cabinet. Replace panels
and fasteners.

Coil Removal and Replacement

Before removing the coil, disconnect all piping.

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 Slide the coil, blockoffs, and drain pan assembly back

into unit the same way it was removed. Check the
installation for an airtight fit.

4 Reinstall screws that secure the top of the leaving coil

face to the upper track on the inside top of the unit.

Figure 53: Coil Removal

Component Removal and Replacement

Panel Removal

Remove the screws located along the sides of the panel. Pull
the panel out using the pocket pull handles. If the panel does
not have a pull handle, remove the adjacent panel with a
pocket pull or door and pop out the panel from the inside.

Fan Section Removal

The fan shaft, motor, and any drive components are removable
through the access door or panel opening.

McQuay IM 782-7 53

Warranty

Warranty

Warranty Details

Consult your local Daikin McQuay Representative for
warranty details. Refer to Form 933- 430285Y. To find your
local Daikin McQuay Representative, go to
www.daikinmcquay.com.

Warranty Return Material Procedure

Defective material may not be returned without permission of
authorized factory service personnel of McQuay International
in Minneapolis, Minnesota, [phone]. A “Return
Goods” tag must be included with the returned material. Enter
the required information to expedite handling and prompt
issuance of credits. All parts must be returned to the
appropriate Daikin McQuay facility, designated on the “Return
Goods” tag. Transportation charges must be prepaid.

The return of the part does not constitute an order for
replacement. Therefore, a purchase order must be entered
through the nearest Daikin McQuay representative. The order
should include part number, model number, and serial number
of the unit involved.

Credit will be issued on customer’s purchase order following
an inspection of the return part and upon determination that the
failure is due to faulty material or workmanship during the
warranty period.

Replacement Parts

When writing to Daikin McQuay for service or replacement
parts, refer to the model number and serial number of the unit
stamped on the serial plate attached to the unit. If replacement
parts are required, mention the date of installation of the unit
and date of failure, along with an explanation of the
malfunctions and a description of the replacement parts
required.

54 McQuay IM 782-7

Warranty

Destiny Equipment Warranty Registration Form

T o comply with the terms of Daikin McQuay W arranty, complete and return this form within
10 days to Daikin McQuay Warranty Department.

Check, test, and start procedure for Daikin McQuay Air Handling Units.

Job Name:________________________________________
Installation address: __________________________________________________________________________________________________
City: ______________________________________________________________________________ State: __________________________
Purchasing contractor:________________________________________________________________________________________________
City: ______________________________________________________________________________ State: __________________________
Name of Person doing start-up (print) ___________________________________________________________________________________

Company name_____________________________________________________________________________________
Address ___________________________________________________________________________________________

City/State/Zip_______________________________________________________________________________________
Unit model number: ________________________________________________ Unit serial number: _______________________________
SF VFD model number:_____________________________ Serial number: ___________________________________
RF VFD model number:_____________________________ N/A

Circle Yes or No. If not applicable to the type of unit, circle N/A.

I. INITIAL CHECK

A. Is any shipping damage visible? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

B. Are fan drives properly aligned and belts properly adjusted? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

C. Tightened all setscrews on pulleys, bearings and fans? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

D. Have the hold-down bolts been backed off on spring mounted fan isolators?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

E. With power off, do fans turn freely by hand? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

F. Electrical service corresponds to unit nameplate?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

Volts __________ Hertz __________ Phase __________

G. Is the main disconnect adequately fused and are fuses installed? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

H. Are all electrical power connections tight?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

I. Is the condensate drain trapped?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

J. Fill drain pan. Does water drain freely? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

K. Is the unit mounted level? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

II. FAN DATA

A. Check rotation of supply fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

B. Voltage at supply fan motor: 1–2 _________V 2–3__________V 1–3_________ V
C. Supply fan motor amp draw per phase: L1____________ L2___________ L3 ___________
D. Overload amp setting: ______________

E. What is the supply fan rpm? ______________

F. Record supply static pressure at unit discharge: _______ inches of H20
G. Record return static pressure at unit (with outside air dampers closed) _____________ inches of H20

III. DAMPERS

A. Are blades and seals present?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

B. Do dampers open smoothly and shut tight?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

IV. ELECTRIC HEAT

A. Electrical heat service corresponds to unit nameplate?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

_________ Volts _________Hertz _________Phase

B. Are there any signs of physical damage to the electric heat coils? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

C. Have all electrical terminals been tightened?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

D. Does sequence controller stage contactors properly? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

E. Electric heater voltage across each phase: L1–2_________V L2–3________ V L1–3 _______ V

F. Amp draw across each phase at each heating stage:

Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Stage 6
Phase L1: ___________ ___________ ____________ ____________ ___________ ___________
Phase L2: ___________ ___________ ____________ ____________ ____________ ___________
Phase L3 ___________ ___________ ____________ ____________ ___________ ___________

G. FLA: L1 ___________ L2 ___________ L3____________

McQuay S.O. No.: _________________ McQuay G.O. No.: _________________

N/A

Serial number: ___________________________________

McQuay IM 782-7 55

Warranty

H. Operate electric heat with fans off. Electric heat must cycle OFF on high limit control.. . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

V. CHILLED WATER COIL

A. Pressure test okay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

B. Drain pan draining okay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

VI. HOT WATER COIL

A. Pressure test okay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

VII. Variable Frequency Drive (VFD)

A. VFD control in manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

1. Minimum speed not less than 20 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

2. Amps at minimum speed____________

3. Amps at 60 Hz____________

B. Automatic control functioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

C. Type of auto control (circle one) 0 -10 VDC 4 - 20 mA Other

Signature:______________________________________________________ Startup date:____________________________________

RETURN COMPLETED FORM WITHIN 10 DAYS OF START-UP TO:
McQuay International Warranty Department, 13600 Industrial Park Boulevard, Minneapolis, MN 55441

Please list any additional comments that could affect the operation of this unit; e.g., shipping damage, failed components, adverse installation
applications, etc., on a separate sheet and attach to this form.

56 McQuay IM 782-7

Warranty

Quality Assurance Survey Report

Quality Assurance Survey Report

To whom it may concern:
Please review the items below upon receiving and installing our product. Mark N/A on any item that does not apply to the

product.
Job Name: _____________________________________________________ McQuay G.O. no. __________________
Installation Address: _____________________________________________________
City: __________________________________________________________ State: __________________
Purchasing Contractor: __________________________________________________
City:__________________________________________________________

Name of person doing start-up (print): _____________________________________________________

1. Is there any shipping damage visible? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

__Location on unit _____________________________________________________

2. How would you rate the overall appearance of the product; i.e., paint, fin damage, etc.?
Excellent Good Fair Poor

3. Did all sections of the unit fit together properly? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Did the cabinet have any air leakage?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Location on unit ___________________________________________________________________________

5. Were there any refrigerant leaks? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

Shipping Workmanship Design

6. Does the refrigerant piping have excessive vibration?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Location on unit ___________________________________________________________________________

7. Did all of the electrical controls function at start-up? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Comments _______________________________________________________________________________

8. Did the labeling and schematics provide adequate information?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Yes No N/A

9. How would you rate the serviceability of the product?
Excellent Good Fair Poor

10. How would you rate the overall quality of the product?
Excellent Good Fair Poor

11. How does the quality of Daikin McQuay products rank in relation to competitive products?
Excellent Good Fair Poor

Comments:
Please list any additional comments which could affect the operation of this unit; i.e., shipping damage, failed

components, adverse installation applications, etc. If additional comment space is needed, write the comment(s) on a
separate sheet, attach the sheet to this completed Quality Assurance Survey Report, and return it to the Warranty
Department with the completed preceding “Equipment Warranty Registration Form”.

State: __________________

Yes No N/A

Yes No N/A
Yes No N/A

Yes No N/A

Yes No N/A

McQuay IM 782-7 57

Daikin McQuay Training and Development

Now that you have made an investment in modern, efficien t Daikin McQuay equipment, its care should be a high
priority. For training information on all Daikin McQuay HVAC products, please visit us at www.DaikinMcQuay.com
and click on training, or call 540-248-9646 and ask for the Training Department.

Warranty

All Daikin McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product
Warranty. Consult your local Daikin McQuay Representative for warranty details. Refer to Form 933-430285Y. T o find
your local Daikin McQuay Representative, go to www.DaikinMcQuay.com.

Aftermarket Services

To find your local parts office, visit www.DaikinMcQuay.com or call 800-37PARTS (800-377-2787). To find your
local service office, visit www. DaikinMcQuay.com or call 800-432-1342.

This document contains the most current product info rm a tio n as of this pr int ing . Fo r th e mo st up - to- d ate pro d uc t
information, please go to www.DaikinMcQuay.com.

Products Manufactured in an ISO Certified Facility.

© 2012 McQuay International • www.DaikinMcQuay.com • 800-432-1342 03/12