McQuay Maverick I MPS006AY Manual

Maverick I™
Commercial Packaged Rooftop System
Cooling Only or Heating & Cooling
Electric/Electric
Model MPS006AY
6 Tons
Installation and Maintenance Manual IM 865
Group: Applied Systems
Part Number: 92-102421-04-00
Date: March 2007
© 2007 McQuay International

2IM 865
Table of Contents
Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Checking Product Received . . . . . . . . . . . . . . . . . . . . 3
Equipment Protection . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pre-Installation Check Points . . . . . . . . . . . . . . . . . . . . . . . . 6
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Outside Slab Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rooftop Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ductwork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Conversion Procedure . . . . . . . . . . . . . . . . . . . . . . . 11
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Downflow to Horizontal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Indoor Air Flow Data . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pre-Start Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Auxiliary Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Control System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Charge Information . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IM 865 3
Introduction
This manual contains the installation and operating instruc-
tions for your packaged rooftop unit. There are a few precau-
tions that should be taken to derive maximum satisfaction
from it. Improper installation can result in unsatisfactory oper-
ation or dangerous conditions.
Read this manual and any instructions packaged with separate
equipment required to make up the system prior to installation.
Give this manual to the owner and explain its provisions. The
owner should retain this manual for future reference.
Checking Product Received
Upon receiving the unit, inspect it for any damage from ship-
ment. Claims for damage, either shipping or concealed, should
be filed immediately with the shipping company. Check the
unit model number, electrical characteristics, and accessories
to determine if they are correct.
Equipment Protection From The
Environment
The metal parts of this unit may be subject to rust or deteriora-
tion in adverse environmental conditions. This oxidation could
shorten the equipment’s useful life. Salt spray, fog or mist in
seacoast areas, sulphur or chlorine from lawn watering sys-
tems, and various chemical contaminants from industries such
as paper mills and petroleum refineries are especially corro-
sive.
If the unit is to be installed in an area where contaminants
are likely to be a problem, special attention should be
given to the equipment location and exposure.
1Avoid having lawn sprinkler heads spray directly on the
unit cabinet.
2In coastal areas, locate the unit on the side of the building
away from the waterfront.
3Shielding provided by a fence or shrubs may give some
protection.
Regular maintenance will reduce the buildup of contami-
nents and help to protect the unit’s finish.
1Frequent washing of the cabinet, fan blade and coil with
fresh water will remove most of the salt or other contami-
nants that build up on the unit.
2Regular cleaning and waxing of the cabinet with a good
automobile polish will provide some protection.
3A good liquid cleaner may be used several times a year to
remove matter that will not wash off with water.
Several different types of protective coatings are offered in
some areas. These coatings may provide some benefit, but the
effectiveness of such coating materials cannot be verified by
the equipment manufacturer.
The best protection is frequent cleaning, maintenance and
minimal exposure to contaminants.
Recognize this symbol as an indication of
Important Safety Information!
!
The manufacturer’s warranty does not cover any damage or
defect to the air conditioner caused by the attachment or
use of any components, accessories or devices (other than
those authorized by the manufacturer) into, onto or in con-
junction with the air conditioner. You should be aware that
the use of unauthorized components, accessories or
devices may adversely affect the operation of the air condi-
tioner and may also endanger life and property. The manu-
facturer disclaims any responsibility for such loss or injury
resulting from the use of such unauthorized components,
accessories or devices.
▲▲DANGER
!
Proposition 65: This unit contains fiberglass insulation.
Respirable particles of fiberglass are known to the state of
California to cause cancer.
▲▲WARNING
!
Disconnect all power to the unit before starting mainte-
nance. Failure to do so can result in severe electrical shock
or death.
▲▲DANGER
!

4IM 865
Figure 1: Unit Dimensions Bottom View
Figure 2: Unit Dimensions
ILL 1316
ILL1305
26
78.25
81.53
2
22
30.25
BASE ELECTRICAL
ENTRY
CONDENSER
COIL
CONDENSER COIL
CONROL ENTRY
COMPRESSOR/
CONTROL BOX
ACCESS
ELECTRIC HEAT ACCESS
CONDENSER FAN
DISCHARGE GRILLE
POWER
ENTRY
RETURN
AIR SUPPLY
AIR
9.56
44.13
46.5
4.5 3.25
4.5
13.13
20
13.13
2.25
4.63
14.44 2
35
11.13
18.19
7.22

IM 865 5
Figure 3: Unit Dimensions
Figure 4: Unit Dimensions – Back View
ILL 1304
ILL 1288
82.25
25.13
12.25 5.5
19.13
4.94
6.84
13.72
12.25
35
31.22
3.81
82.25
24.03
48.06
5.34
COIL/FILTER
ACCESS
BLOWER
ACCESS
CONDENSATE DRAIN
3/4” NPT FEMALE
RETURN COVER/
OPTIONAL OUTDOOR
AIR HOOD LOCATION
SUPPLY COVER

6IM 865
Installation
General
1PRE-INSTALLATION CHECK-POINTS
Before attempting any installation, the following points
should be carefully considered:
aStructural strength of supporting members.
(rooftop installation)
bClearances and provision for servicing.
cPower supply and wiring.
dAir duct connections.
eDrain facilities and connections.
fLocation for minimum noise.
2LOCATION
These units are designed for outdoor installations. They
can be mounted on a slab or rooftop. They are not to be
installed within any part of a structure such as an attic,
crawl space, closet, or any other place where condenser
air flow is restricted or other than outdoor ambient condi-
tions prevail. Since the application of the units is of the
outdoor type, it is important to consult your local code
authorities at the time the first installation is made.
Outside Slab Installation
(Typical outdoor slab installations are shown in Figures 5 and 6.)
1Select a location where external water drainage cannot
collect around the unit.
2Provide a level concrete slab extending 3" beyond all four
sides of the unit. The slab should be sufficient above
grade to prevent ground water from entering the unit.
IMPORTANT: To prevent transmission of noise or vibration,
slab should not be connected to building structure.
3The location of the unit should be such as to provide
proper access for inspection and servicing.
4Locate unit where operating sounds will not disturb owner
or neighbors.
5Locate unit so roof runoff water does not pour directly on
the unit. Provide gutter or other shielding at roof level. Do
not locate unit in an area where excessive snow drifting
may occur or accumulate.
Clearances
The following minimum clearances must be observed for
proper unit performance and serviceability.
1Provide 12" minimum clearance at the front of the unit.
Provide 36" minimum clearance at the left and 18" on the
right side of the unit for service access.
2Provide 60" minimum clearance between top of unit and
maximum 3 foot overhang.
3Unit is design certified for application on combustible
flooring with 0" minimum clearance.
4See Figure 5 for illustration of minimum installation-ser-
vice clearances.
*5When used with economizer, 12" minimum dimension at
unit front becomes 57".
Figure 5: Outside Slab Installation, Basement or Crawl
Space Distribution System
Figure 6: Outside Slab Installation, Closet Distribution
System. Slab Floor Construction
ILL I308
ILL I309
*12ⴖ
18ⴖ
*

IM 865 7
Rooftop Installation
1Before locating the unit on the roof, make sure that the
strength of the roof and beams is adequate at that point to
support the weight involved. (See specification sheet for
weight of unit.) This is very important and user’s respon-
sibility.
2For rigging and roofcurb details, see Figures 7 and 8. Use
field-furnished spreaders.
NOTE: Remove shipping boards from unit before installing
on the roofcurb.
3For roofcurb assembly, see Roofcurb Installation Instruc-
tions.
4If the roofcurb is not used, provisions for disposing of
condensate water runoff must be provided.
5The unit should be placed on a solid and level roofcurb or
platform of adequate strength. See Figure 9.
6The location of the unit on the roof should be such as to
provide proper access for inspection and servicing.
IMPORTANT: If unit will not be put into service immediately, cover
supply and return openings to prevent excessive condensation.
Figure 8: Packaged Air Conditioner Roofcurb Installation
Figure 7: Packaged Air Conditioner Rigging For Lifting
CORNER WEIGHTS BY PERCENTAGE
ABCD
23% 29% 21% 27%
I296
SPREADER BAR
A
C
B
LIFTING BEAM
5/8ⴖSHACKLE
(EACH CORNER)
39ⴖ
26-1/8
CENTER OF
GRAVITY
D
SUPPLY
RETURN
NAILING STRIP
OVERHANG
THIS END
ONLY
6-1/4ⴖ
*NOTE
RETURN DUCT*
UNIT
SUPPLY DUCT*
INSULATION PANELS
(4) SUPPLIED
ST-A0801-20-01
GASKET
(FULL PERIMETER
AND ON DIVIDERS.
MUST BE ABOVE DUCT
AND INSULATION
PANEL FLANGES.)
ST-A0801-20-01
ROOFTOP UNIT
COUNTER FLASHING*
INSULATION*
1/4ⴖTYP (3) SIDES
*SEE NOTE
CANT STRIP*
ROOF FELT*
INSULATION*
ROOF DECK*
*BY CONTRACTOR
ROOF
STRUCTURAL
MEMBER*
ROOFCURB
DUCT*
NAILER STRIP
GASKET
HOLD
DOWN
BRACKET
TYP. (4) PLCS.
CABLE OR
CHAIN
NOTE: Remove shipping boards from unit before installing on the roofcurb.

8IM 865
General Data
Nominal Sizes 6 Tons [21.1 kW] ASHRAE 90.1-2004 Compliant Models
[]DesignatesMetric Conversions
McQuay MPS Series 006AYCL 006AYCM 006AYDL 006AYDM
Cooling Performance1
Gross Cooling Capacity Btu [kW] 75,000 [21.97] 75,000 [21.97] 75,000 [21.97] 75,000 [21.97]
EER/SEER210.3/9.5 10.3/9.5 10.3/NA
Nominal CFM/ARI Rated CFM [L/s] 2000/2400 [944/1133] 2000/2400 [944/1133] 2000/2400 [944/1133] 2000/2400 [944/1133]
ARI Net Cooling Capacity Btu [kW] 72,000 [21.1] 72,000 [21.1] 72,000 [21.1] 72,000 [21.1]
Net Sensible Capacity Btu [kW] 53,000 [15.53] 53,000 [15.53] 53,000 [15.53] 53,000 [15.53]
Net System Power kW 6.99 6.99 6.99 6.99
Net Weight lbs. [kg] 619 [281] 619 [281] 619 [281] 619 [281]
Integrated Part Load Value311.5 11.5 11.5 11.5
Compressor
No./Type 2/Scroll 2/Scroll 2/Scroll 2/Scroll
Outdoor Sound Rating (dB)483 83 83 83
Outdoor Coil—Fin Type Louvered Louvered Louvered Louvered
Tube Type Rifled Rifled Rifled Rifled
Tube Size in. [mm] OD 0.375 [9.5] 0.375 [9.5] 0.375 [9.5] 0.375 [9.5]
Face Area sq. ft. [sq. m] 16.56 [1.54] 16.56 [1.54] 16.56 [1.54] 16.56 [1.54]
Rows / FPI [FPcm] 2 / 22 [9] 2 / 22 [9] 2 / 22 [9] 2 / 22 [9]
Net Latent Capacity Btu [kW] 19,000 [5.57] 19,000 [5.57] 19,000 [5.57] 19,000 [5.57]
Indoor Coil—Fin Type Louvered Louvered Louvered Louvered
Tube Type Rifled Rifled Rifled Rifled
Tube Size in. [mm] 0.375 [9.5] 0.375 [9.5] 0.375 [9.5] 0.375 [9.5]
Face Area sq. ft. [sq. m] 6.5 [0.6] 6.5 [0.6] 6.5 [0.6] 6.5 [0.6]
Rows / FPI [FPcm] 4 / 12 [5] 4 / 12 [5] 4 / 12 [5] 4 / 12 [5]
Refrigerant Control Capillary Tubes Capillary Tubes Capillary Tubes Capillary Tubes
Drain Connection No./Size in. [mm] 1/1 [25.4] 1/1 [25.4] 1/1 [25.4] 1/1 [25.4]
Outdoor Fan—Type Propeller Propeller Propeller Propeller
No. Used/Diameter in. [mm] 1/24 [609.6] 1/24 [609.6] 1/24 [609.6] 1/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1 Direct/1 Direct/1
CFM [L/s] 4000 [1888] 4000 [1888] 4000 [1888] 4000 [1888]
No. Motors/HP 1 at 1/3 HP 1 at 1/3 HP 1 at 1/3 HP 1 at 1/3 HP
Motor RPM 1075 1075 1075 1075
Indoor Fan—Type FC Centrifugal FC Centrifugal FC Centrifugal FC Centrifugal
No. Used/Diameter in. [mm] 1/10x9 [254x229] 1/10x9 [254x229] 1/10x9 [254x229] 1/10x9 [254x229]
Drive Type/No. Speeds Belt/Variable Belt/Variable Belt/Variable Belt/Variable
No. Motors 1 1 1 1
Motor HP 1 1/2 1 1/2 1 1/2 1 1/2
Motor RPM 1725 1725 1725 1725
Motor Frame Size 0 0 0 0
Filter—Type Disposable Disposable Disposable Disposable
Furnished Yes Yes Yes Yes
(No.) Size Recommended in. [mm] (4)2x16x16 [51x406x406] (4)2x16x16 [51x406x406] (4)2x16x16 [51x406x406] (4)2x16x16 [51x406x406]
Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 88/88 [2495/2495] 88/88 [2495/2495] 88/88 [2495/2495] 88/88 [2495/2495]
Weights
Ship Weight lbs. [kg] 628 [285] 628 [285] 628 [285] 628 [285]
10.3/NA
CONTINUED
NOTES:
1. Cooling Performance israted at 95° F ambient, 80° F entering dry bulb, 67° F entering wet bulb. Gross capacity does
not include the effect of fan motor heat. ARI capacity isnet and includesthe effect of fan motor heat. Unitsare suitable
for operation to 20%of nominal cfm. Unitsare certified in accordance with the Unitary Air Conditioner Equipment
certification program, which isbased on ARI Standard 210/240 or 360.
2. EER and/or SEER are rated at ARI conditionsand in accordance with DOE test procedures.
3. Integrated Part Load Value israted in accordance with ARI Standard 210/240 or 360. Unitsare rated at 80° F ambient,
80° F entering dry bulb, and 67° F entering wet bulbat ARI rated cfm.
4. Outdoor Sound Rating shown istested in accordance with ARI Standard 270.

IM 865 9
NOTES:
1. Cooling Performance israted at 95° F ambient, 80° F entering dry bulb, 67° F entering wet bulb. Gross capacity does
not include the effect of fan motor heat. ARI capacity isnet and includesthe effect of fan motor heat. Unitsare suitable
for operation to 20%of nominal cfm. Unitsare certified in accordance with the Unitary Air Conditioner Equipment
certification program, which isbased on ARI Standard 210/240 or 360.
2. EER and/or SEER are rated at ARI conditionsand in accordance with DOE test procedures.
3. Integrated Part Load Value israted in accordance with ARI Standard 210/240 or 360. Unitsare rated at 80° F ambient,
80° F entering dry bulb, and 67° F entering wet bulbat ARI rated cfm.
4. Outdoor Sound Rating shown istested in accordance with ARI Standard 270.
General Data
Nominal Sizes 6 Tons [21.1 kW] ASHRAE 90.1-2004 Compliant Models
[]DesignatesMetric Conversions
McQuay MPS Series 006AYYL 006AYYM
Cooling Performance1
Gross Cooling Capacity Btu [kW] 75,000 [21.97] 75,000 [21.97]
EER/SEER210.3/NA 10.3/NA
Nominal CFM/ARI Rated CFM [L/s] 2000/2400 [944/1133] 2000/2400 [944/1133]
ARI Net Cooling Capacity Btu [kW] 72,000 [21.1] 72,000 [21.1]
Net Sensible Capacity Btu [kW] 53,000 [15.53] 53,000 [15.53]
Net System Power kW 6.99 6.99
Net Weight lbs. [kg] 619 [281] 619 [281]
Integrated Part Load Value311.5 11.5
Compressor
No./Type 2/Scroll 2/Scroll
Outdoor Sound Rating (dB)483 83
Outdoor Coil—Fin Type Louvered Louvered
Tube Type Rifled Rifled
Tube Size in. [mm] OD 0.375 [9.5] 0.375 [9.5]
Face Area sq. ft. [sq. m] 16.56 [1.54] 16.56 [1.54]
Rows / FPI [FPcm] 2 / 22 [9] 2 / 22 [9]
Net Latent Capacity Btu [kW] 19,000 [5.57] 19,000 [5.57]
Indoor Coil—Fin Type Louvered Louvered
Tube Type Rifled Rifled
Tube Size in. [mm] 0.375 [9.5] 0.375 [9.5]
Face Area sq. ft. [sq. m] 6.5 [0.6] 6.5 [0.6]
Rows / FPI [FPcm] 4 / 12 [5] 4 / 12 [5]
Refrigerant Control Capillary Tubes Capillary Tubes
Drain Connection No./Size in. [mm] 1/1 [25.4] 1/1 [25.4]
Outdoor Fan—Type Propeller Propeller
No. Used/Diameter in. [mm] 1/24 [609.6] 1/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1
CFM [L/s] 4000 [1888] 4000 [1888]
No. Motors/HP 1 at 1/3 HP 1 at 1/3 HP
Motor RPM 1075 1075
Indoor Fan—Type FC Centrifugal FC Centrifugal
No. Used/Diameter in. [mm] 1/10x9 [254x229] 1/10x9 [254x229]
Drive Type/No. Speeds Belt/Variable Belt/Variable
No. Motors 1 1
Motor HP 1 1/2 1 1/2
Motor RPM 1725 1725
Motor Frame Size 0 0
Filter—Type Disposable Disposable
Furnished Yes Yes
(No.) Size Recommended in. [mm] (4)2x16x16 [51x406x406] (4)2x16x16 [51x406x406]
Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 88/88 [2495/2495] 88/88 [2495/2495]
Weights
Ship Weight lbs. [kg] 628 [285] 628 [285]

10 IM 865
Miscellaneous
ELECTRICAL DATA
Minimum Circuit Ampacity 34/34
Unit Information
Unit Operating
Voltage Range 187-253
Minimum Overcurrent
Protection Device Size 40/40
Maximum Overcurrent
Protection Device Size 40/40
Compressor Motor
No. 2
Volts 208/230
Phase 3
HP 3
RPM 3450
Amps (RLA) 11.4/11.4
Amps (LRA) 77/77
Condenser Motor
No. 1
Volts 208/230
Phase 1
HP 1/3
Amps (FLA) 2.6
Amps (LRA) 4.7
Evaporator Fan
No. 1
Volts 208/230
Phase 3
HP 1 1/2
Amps (FLA) 5.8
Amps (LRA) 0 0
5.8
1 1/2
3
208/230
1
4.7
2.6
1/3
1
208/230
1
77/77
11.4/11.4
3450
3
3
208/230
2
40/40
40/40
34/34
187-253
0
2.8
1 1/2
3
460
1
2.4
1
1/3
1
460
1
39
5.9
3450
3
460
2
20
20
18
414-506
0
2.8
1 1/2
3
460
1
2.4
1
1/3
1
460
1
39
5.9
3450
3
460
2
20
20
18
414-506
0
2.3
1 1/2
3
575
1
1.5
0.9
1/3
1
575
1
31
4.7
3450
3
575
2
15
15
14
518-632
0
2.3
1 1/2
3
575
1
1.5
0.9
1/3
1
575
1
31
4.7
3450
3
575
2
15
15
14
518-632
006AYCL 006AYCM 006AYDL 006AYDM 006AYYL 006AYYM
1. Horsepower Per Compressor.
2. Amp Draw Per Motor. Multiply Value By Number of Motors to Determine Total Amps.
Table A

IM 865 11
Ductwork
Ductwork should be fabricated by the installing contractor in
accordance with local codes and NFPA90A. Industry manuals
may be used as a guide when sizing and designing the duct
system - contact Air Conditioning Contractors of America,
1513 16th St. N.W., Washington, D.C. 20036.
The unit should be placed as close to the space to be air condi-
tioned as possible allowing clearance dimensions as indicated.
Ducts should be run as directly as possible to supply and
return outlets. Use of non-flammable waterproof flexible con-
nectors on both supply and return connections at the unit to
reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if
the registers or diffusers are located on the wall or in the ceil-
ing. A slab installation could be considered when the registers
are low on a wall or in the floor.
On ductwork exposed to outside air conditions of temperature
and humidity, use a minimum of 2" of insulation and a vapor
barrier. Distribution system in attic, furred space or crawl
space should be insulated with at least 2" of insulation with
vapor barrier. One-half to 1" thickness of insulation is usually
sufficient for ductwork inside the air conditioned space.
Balancing dampers should be provided for each branch duct in
the supply system. Ductwork should be properly supported
from the structure.
When installing ductwork, consider the following items:
1Noncombustible flexible connectors should be used
between ductwork and unit to reduce noise and vibra-
tion transmission into the ductwork.
2When auxiliary heaters are installed, use noncom-
bustible flexible connectors and clearance to com-
bustible material of 0" for the first 3 feet of discharge
duct.
Filters
This unit is provided with 4 - 16" x 16" x 2" disposable filters.
When replacing filters, ensure they are inserted fully to the
back to prevent bypass.
Conversion Procedure
Downflow to Horizontal
1Remove the screws and covers from the outside of the
supply and return sections.
2Install the covers in the bottom supply and return open-
ings with the painted side up. See Figure 10. Use the
existing gasket to seal the covers.
3Secure the supply cover to the base of the unit with 1
screw, engaging prepunched tab in unit base.
4Secure the return cover to the base of the unit with
screws, engaging prepunched holes in the unit base.
Condensate Drain
The condensate drain connection of the evaporator is 3/4"
nominal female pipe thread. IMPORTANT: Install a conden-
sate trap to ensure proper condensate drainage. See Figure 11.
Figure 9: Flat Rooftop Installation, Attic or Drop Ceiling
Distribution System. Mounted on Roofcurb. Curb Must Be
Level.
Figure 10: Cover Gasket Detail
ILL I310
ILL I631
Do not, under any circumstances, connect return ductwork
to any other heat producing device such as a fireplace
insert, stove, etc. Unauthorized use of such devices may
result in fire, carbon monoxide poisoning, explosion, proper-
ty damage, severe personal injury or death.
▲▲DANGER
!
Figure 11: Condensate Drain

12 IM 865
Electrical Wiring
Field wiring must comply with the National Electrical Code*
and local ordinances that may apply.
*C.E.C. in Canada
Power Wiring
1It is important that proper electrical power is available at
the unit. Voltage should not vary more than 10% from
that stamped on the unit rating plate. On three phase
units, phases must be balanced within 3%.
2Install a branch circuit disconnect within sight of the unit
and of adequate size to handle the starting current. (See
Tables A and F.) A bracket is shipped with the unit for
mounting the disconnect. Reference Figure 12 for proper
location.
3For branch circuit wiring (main power supply to unit dis-
connect), the minimum wire size can be determined from
Table B using the circuit ampacity found on the unit
nameplate or from Tables A and E.
4This unit incorporates single point electrical connection
for unit and electric heat accessory.
5Power wiring must be run in grounded rain-tight conduit.
Connect the power field wiring as follows:
aNO ELECTRIC HEAT - Connect the field wires
directly to the contactor pigtail in the electric heat
access area. Connect ground wire to ground lug.
bWITH ELECTRIC HEAT - Connect the field wires to
the terminal block on the electric heater kit in the elec-
tric heat access area. Connect the ground wire to the
ground lug on the heater kit.
NOTE: For field installation of a heater kit, follow the instructions
provided with the heater kit.
6The pigtail wires in the electric heat access area are facto-
ry wired to the contactor in the control box.
7DO NOT connect aluminum field wires to electric heat
kit power input terminals.
Control Wiring (CLASS II)
1Low voltage wiring should not be run in conduit with
power wiring.
2Control wiring is routed through the 7/8" hole adjacent to
the compressor access panel. See Figure 2. Use a mini-
mum #18 AWG thermostat wire. For wire lengths
exceeding 50', use #16 AWG thermostat wire. The low
voltage wires are connected to the unit pigtails which are
supplied with the unit in the low voltage connection box
located below the unit control box.
3Figure 14 shows representative low voltage connection
diagrams. Read your thermostat installation instructions
for any special requirements for your specific thermostat.
NOTE: Units installed in Canada require that an outdoor
thermostat (30,000 min. cycles of endurance) be installed
and be wired with C.E.C. Class I wiring.
Internal Wiring
1A diagram of the internal wiring of this unit is located on
the inside of the compressor access panel. If any of the
original wire as supplied with the unit must be replaced,
the wire gauge and insulation must be the same as origi-
nal wiring.
208 Volt Applications
Transformer is factory-wired for 220 volts on 200/220 volt
models and must be changed for 200-volt applications. See
unit wiring diagram for 200-volt wiring.
Grounding
TABLE B: COPPER WIRE SIZE — AWG (1% VOLTAGE DROP)
300
250
200
150
100
50
Supply
Wire
Length
Feet
4
4
6
8
10
14
15
3
4
4
6
8
12
20
2
3
4
6
8
10
25
2
3
4
4
6
10
30
1
2
3
4
6
8
35
1/0
1
2
4
6
8
40
1/0
1
2
3
4
6
45
2/0
1/0
1
3
4
6
50
2/0
1/0
1
2
4
6
55
3/0
2/0
1/0
2
3
4
60
3/0
2/0
1/0
1
3
4
65
3/0
2/0
1/0
1
2
4
70
4/0
3/0
2/0
1/0
2
3
75
4/0
3/0
2/0
1/0
2
3
80
4/0
3/0
2/0
1/0
1
3
85
4/0
4/0
3/0
1/0
1
2
90
250
4/0
3/0
2/0
1
2
95
250
4/0
3/0
2/0
1
2
100
250
4/0
3/0
2/0
1
2
105
250
4/0
3/0
2/0
1/0
2
110
300
250
4/0
2/0
1/0
1
115
300
250
4/0
3/0
1/0
1
120
300
250
4/0
3/0
1/0
1
125
Circuit Ampacity
NOTE:
1. Wire size based on 60ºC type copper conductors below 100 ampacity. 2. Wire size based on 75ºC type copper conductors for 100 ampacity and above.
Figure 12: Recommended Location of Branch Circuit
Disconnect
TO POWER
BRANCH CIRCUIT DISCONNECT
TO CONTROL
The unit must be permanently grounded. A grounding lug is
provided in the electric heat kit access area for a ground
wire. Failure to ground this unit can result in fire or electrical
shock causing property damage, severe personal injury or
death.
▲▲DANGER
!

IM 865 13
GROUNDING MAY BE ACCOMPLISHED BY GROUND-
ING THE POWER LINE CONDUIT TO THE UNIT. MAKE
SURE THE CONDUIT NUT LOCKING TEETH HAVE
PIERCED THE INSULATING PAINT FILM OF THE SIDE
PANEL.
Thermostat
The thermostat should be mounted on an inside wall about
five feet above the floor in a location where it will not be
affected by unconditioned air, sun, or drafts from open doors
or other sources. READ installation instructions in thermostat
package CAREFULLY because each has some different
wiring requirements. The low voltage wiring should be sized
as shown in Table B.
Install the room thermostat in accordance with the instruction
sheet packed in the box with the thermostat.
Indoor Air Flow Data
Belt-drive blower models have motor sheaves set for proper
CFM at a typical external static. See Table F for blower per-
formance.
Pre-Start Check
1Is unit properly located and slightly slanted toward indoor
condensate drain?
2Is ductwork insulated, weatherproofed, with proper spac-
ing to combustible materials?
3Is air free to travel to and from outdoor coil? (See Figure
5.)
4Is the wiring correct, tight, and according to unit wiring
diagram?
5Is unit grounded?
6Are field supplied air filters in place and clean?
7Do the outdoor fan and indoor blower turn freely without
rubbing, and are they tight on the motor shafts?
Startup
1Turn thermostat to “OFF,” turn “on” power supply at
disconnect switch.
2Turn temperature setting as high as it will go.
3Turn fan switch to “ON.”
4Indoor blower should run. Be sure it is running in the
right direction.
Figure 14: Low Voltage Connections Diagrams
STANDARD CONTROL WIRING
R
W
G
Y
Y2
C
RED
BLACK
GRAY
YELLOW
ORANGE
BROWN
THERMOSTAT
SUB-BASE
UNIT CONTROLS
WIRE PIGTAILS
Table C
FIELD WIRE SIZE FOR 24 VOLT THERMOSTAT CIRCUITS
SOLID COPPER WIRE - AWG.
3.0 16 14 12 10 10 10
2.5 16 14 12 12 12 10
2.0 18 16 14 12 12 10
50 100 150 200 250 300
Length of Run – Feet (1)
Thermostat Load -
Amps
(1) The total wire length is the distance from the furnace to the thermo-
stat and back to the furnace.
NOTE: DO NOT USE CONTROL WIRING SMALLER THAN NO. 18
AWG.

14 IM 865
5Turn fan switch to “AUTO.” Turn system switch to
“COOL” and turn temperature setting below room tem-
perature. Unit should run in cooling mode.
6Is outdoor fan operating correctly in the right direction?
7Is compressor running correctly?
8Check the refrigerant charge using the instructions
located on compressor access panel. Replace service
port caps. Service port cores are for system access only
and will leak if not tightly capped.
9Turn thermostat system switch to proper mode “HEAT”
or “COOL” and set thermostat to proper temperature
setting. Record the following after the unit has run some
time.
aOperating Mode _____________________________
bDischarge Pressure (High) _________________PSIG
cVapor Pressure at Compressor (Low) ________PSIG
dVapor Line Temperature at Compressor ________°F.
eIndoor Dry Bulb___________________________°F.
fIndoor Wet Bulb __________________________°F.
gOutdoor Dry Bulb _________________________°F.
hOutdoor Wet Bulb _________________________°F.
iVoltage at Contactor _____________________Volts
jCurrent at Contactor _____________________Amps
kModel Number ______________________________
lSerial Number_______________________________
mLocation ___________________________________
nOwner _____________________________________
oDate_______________________________________
10 Adjust discharge air grilles and balance system.
11 Check ducts for condensation and air leaks.
12 Check unit for tubing and sheet metal rattles.
13 Instruct the owner on operation and maintenance.
14 Leave “INSTALLATION” and ”USE AND CARE“
instructions with owner.
Operation
Most single phase units are operated PSC (no start relay or
start capacitor). It is important that such systems be off for a
minimum of 5 minutes before restarting to allow equalization of
pressures. The thermostat should not be moved to cycle unit
without waiting five minutes. To do so may cause the compres-
sor to stop on an automatic open overload device or blow a
fuse. Poor electrical service can cause nuisance tripping in
overloads or blow fuses.
IMPORTANT: The compressor has an internal overload protec-
tor. Under some conditions, it can take up to 2 hours for this
overload to reset. Make sure overload has had time to reset
before condemning the compressor.
Some units are equipped with a time delay control (TDC1). The
control allows the blower to operate for up to 60 seconds after
the thermostat is satisfied.
Auxiliary Heat
Control System Operation
1In the cooling mode, the thermostat will, on a call for
cooling, energize the compressor contactors and the
indoor blower relay. The indoor blower can be operat-
ed continuously by setting the thermostat fan switch at
the “ON” position.
2In the heating mode, the thermostat will energize one
or more supplementary resistance heaters, if included.
Replacement Parts
To find your local McQuay Certified Parts Distributor, go to
www.mcquay.com and select Parts Locator.
Charge Information
Refer to the appropriate charge chart included in this manual.
Troubleshooting
Refer to the troubleshooting chart included in this manual.
Wiring Diagrams
Refer to the appropriate wiring diagram included in this manual.
Only electric heater kits supplied by this manufacturer as
described in this publication have been designed, tested,
and evaluated by a nationally recognized safety testing
agency for use with this unit. Use of any other manufactured
electric heaters installed within this unit may cause haz-
ardous conditions resulting in property damage, fire, bodily
injury or death.
▲▲DANGER
!
Figure 13: Heater Kit Installation
ILL I312

IM 865 15
AIR-FLOW PERFORMANCE – 6 TON BELT DRIVE
TABLE D
RPM WATTS
—— —— —— ——
780 660 815 720 845 780 870 855 900 945 930 1075
RPM WATTS
1010 760 1020 815 1050 900 1065 960 1080 1045 1100 1130 1120 1215 1135 1300 1165 1425 1185 1540
RPM WATTS
1210 1015 1220 1115 1230 1205 1240 1295 1255 1380
—— —— —— —— ——
6 TON PACKAGE UNIT
VOLTAGE: 208/230 - 460 & 575 - 3 PHASE
E.S.P. – INCHES WATER
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.10 1.20 1.30 1.40 1.50
1800 1900 2000 2100 2200 2300 2400 2500 2600 2700
RPM WATTS
—— ——
775 600 810 650 825 700 855 760 880 835 910 915 940 1005 970 1100
RPM WATTS
785 560 830 615 860 675 880 740 910 810 930 870 950 945 960 1020
1005 1105 1030 1200
RPM WATTS
850 605 875 660 895 720 920 780 945 850 960 910 990 990
1020 1085 1040 1175 1060 1260
RPM WATTS
895 650 915 700 930 750 955 820 980 880
1000 960 1025 1050 1045 1140 1065 1225 1090 1335
RPM WATTS
930 670
955 740 975 800 995 860
1015 930 1035 1005 1055 1110 1080 1200 1100 1295 1125 1395
RPM WATTS
975 720 990 770
1015 840 1030 920 1050 1000 1065 1060 1085 1155 1110 1260 1135 1350 1155 1470
RPM WATTS
1050 800 1070 855 1065 940 1100 1025 1120 1100 1135 1180 1150 1335 1175 1390 1200 1505 1220 1615
RPM WATTS
1090 850 1105 925 1120 1000 1130 1080 1145 1180 1160 1250 1185 1355 1205 1450 1225 1580 1235 1875
RPM WATTS
1120 890 1135 960 1145 1035 1160 1130 1180 1220 1200 1325 1220 1430 1230 1530 1240 1635 1255 1730
“M”
RPM WATTS
1150 940 1165 1015 1175 1090 1190 1180 1205 1260 1220 1370 1235 1470 1250 1580 1270 1665
——
RPM WATTS
1180 980 1195 1075 1205 1150 1220 1250 1230 1330 1240 1425 1255 1525 1295 1630
—— ——
AIR
FLOW
CFM
DRIVE PACKAGE “L” “M” MOTOR H.P. 1 1/2 11/2 BLOWER SHEAVE 6.4ⴖPITCH DIAMETER 6.4ⴖPITCH DIAMETER
MOTOR SHEAVE 2.8ⴖ- 3.8ⴖPITCH DIAMETER 3.4ⴖ- 4.4ⴖPITCH DIAMETER
TURNS OPEN 0 1 2 3 4 5 6 0 1 2 3 4 5 6 RPM 1100 1050 1000 945 895 845 780 1295 1230 1195 1145 1100 1050 1000
STANDARD INDOOR AIRFLOW - CFM
COMPONENT 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
RESISTANCE - INCHES WATER
WET COIL .035 .040 .060 .070 .085 .100 .110 .120 .125 .130 DOWNFLOW .055 .060 .066 .072 .080 .086 .093 .100 .107 .115 ECONOMIZER R. A. DAMPER .05 .06 .07 .08 .09 .10 .11 .12 .13 .15
COMPONENT AIR RESISTANCE
NOTES: 1. PERFORMANCE SHOWN WITH DRY COIL & STANDARD FILTERS 2. STANDARD CFM @ .075 LBS./CU. FT. 3. MOTOR EFFICIENCY = 80% 4. BHP = WATTS X MOTOR EFF.
746
5. ADD COMPONENT RESISTANCE TO DUCT STATIC TO DETERMINE TOTAL E.S.P.
RPM WATTS
——
785 580 815 625 840 680 865 750 890 830 920 900 945 975 975 1060
1000 1145
“L”

16 IM 865
TABLE E: AUXILIARY HEATER KITS CHARACTERISTICS AND APPLICATION
MAX. FUSE OR HEATER KIT AIR CONDITIONER
CKT. BKR. MAX. FUSE OR AIR MAX. FUSE
UNIT HEATER KIT HEATER KW HEATER KIT UNIT MIN. CKT. SIZE (CKT. BKR. HEATER KIT CKT. BKR. SIZE CONDITIONER OR CKT. BKR.
MODEL MODEL NO. @ 208/240* FLA AMPACITY MUST BE MIN. CKT. (CKT. BKR. MUST MIN. CKT. SIZE (CKT. BKR.
NUMBER HACR TYPE FOR AMPACITY BE HACR TYPE AMPACITY MUST BE HACR
USA) FOR USA) TYPE FOR USA)
NONE — — 34/34 40/40 — — 34/34 40/40
A06C 4.2/5.6 11.7/13.5 34/34 40/40 15/17 15/20
A10C 7.2/9.6 20.0/23.1 34/37 40/40 25/29 25/30
A11C 7.2/9.6 20.0/23.1 34/37 40/40 25/29 25/30
MPS006AYCL A12C 8.4/11.2 23.4/27.0 37/41 40/45 30/34 30/35
A15C 10.8/14.4 30.1/34.7 45/51 45/60 38/44 40/45
A20C 14.4/19.2 40.1/46.2 58/65 60/70 50/58 50/60
A21C 14.4/19.2 40.1/46.2 58/65 60/70 50/58 50/60
A24C 18.0/24.0 50.1/57.8 70/80 70/80 63/73 70/80
NONE — — 34/34 40/40 — — 34/34 40/40
A06C 4.2/5.6 11.7/13.5 34/34 40/40 15/17 15/20
A10C 7.2/9.6 20.0/23.1 34/37 40/40 25/29 25/30
A11C 7.2/9.6 20.0/23.1 34/37 40/40 25/29 25/30
MPS006AYCM A12C 8.4/11.2 23.4/27.0 37/41 40/45 30/34 30/35
A15C 10.8/14.4 30.1/34.7 45/51 45/60 38/44 40/45
A20C 14.4/19.2 40.1/46.2 58/65 60/70 50/58 50/60
A21C 14.4/19.2 40.1/46.2 58/65 60/70 50/58 50/60
A24C 18.0/24.0 50.1/57.8 70/80 70/80 63/73 70/80
NONE — — 18 20 — — 18 20
A06D 5.6 6.7 18 20 9 10
A10D 9.6 11.6 18 20 15 15
A11D 9.6 11.6 18 20 15 15
MPS006AYDL A12D 11.2 13.5 21 25 17 20
A15D 14.4 17.3 26 30 22 25
A20D 19.2 23.1 33 35 30 30
A21D 19.2 23.1 33 35 29 30
A24D 24.0 28.9 40 40 37 40
NONE — — 18 20 — — 18 20
A06D 5.6 6.7 18 20 9 10
A10D 9.6 11.6 18 20 15 15
A11D 9.6 11.6 18 20 15 15
MPS006AYDM A12D 11.2 13.5 21 25 17 20
A15D 14.4 17.3 26 30 22 25
A20D 19.2 23.1 33 35 30 30
A21D 19.2 23.1 33 35 29 30
A24D 24.0 28.9 40 40 37 40
NONE — — 14 15 — — 14 15
A15Y 14.4 13.9 21 25 18 20
MPS006AYYL A20Y 19.2 18.5 26 30 24 25
A24Y 24.0 23.1 32 35 29 30
NONE — — 14 15 — — 14 15
A15Y 14.4 13.9 21 25 18 20
MPS006AYYM A20Y 19.2 18.5 26 30 24 25
A24Y 24.0 23.1 32 35 29 30

IM 865 17
6 TON AIR CONDITIONER
SYSTEM CHARGE CHART - REFRIGERANT 22
6 TON - CIRCUIT 01

18 IM 865
6 TON AIR CONDITIONER
SYSTEM CHARGE CHART - REFRIGERANT 22
6 TON - CIRCUIT 02

IM 865 19
TROUBLE SHOOTING CHART
SYMPTOM POSSIBLE CAUSE REMEDY
Unit will not run • Power off or loose electrical connection • Check for correct voltage at compressor contactor in control
box
• Thermostat out of calibration-set too high • Reset
• Defective contactor • Check for 24 volts at contactor coil - replace if contacts are
open
• Blown fuses • Replace fuses
• Transformer defective • Check wiring-replace transformer
• High pressure control open (if provided) • Reset-also see high head pressure remedy-The high pressure
control opens at 450 PSIG
• Interconnecting low voltage wiring damaged • Replace thermostat wiring
Condenser fan runs, compressor • Run or start capacitor defective (single phase only) • Replace
doesn’t • Start relay defective (single phase only) • Replace
• Loose connection • Check for correct voltage at compressor -
check & tighten all connections
• Compressor stuck, grounded or open motor winding • Wait at least 2 hours for overload to reset.
open internal overload. If still open, replace the compressor.
• Low voltage condition At compressor terminals, voltage must be within 10% of rating
plate volts when unit is operating.
• Low voltage condition • Add start kit components
Insufficient cooling • Improperly sized unit • Recalculate load
• Improper airflow • Check - should be approximately 400 CFM per ton.
• Incorrect refrigerant charge • Charge per procedure attached to unit service panel.
• Air, non-condensibles or moisture in system • Recover refrigerant, evacuate & recharge, add filter drier
• Incorrect voltage • At compressor terminals, voltage must be within 10% of rating
plate volts when unit is operating.
Compressor short cycles • Incorrect voltage • At compressor terminals, voltage must be ± 10% of
nameplate marking when unit is operating.
• Defective overload protector • Replace - check for correct voltage
• Refrigerant undercharge • Add refrigerant
Registers sweat • Low evaporator airflow • Increase speed of blower or reduce restriction - replace air
filter
High head-low vapor pressures • Restriction in liquid line, expansion device or filter drier • Remove or replace defective component
• Incorrect capillary tubes • Change coil assembly
High head-high or normal vapor • Dirty condenser coil • Clean coil
pressure - Cooling mode • Refrigerant overcharge • Correct system charge
• Condenser fan not running • Repair or replace
• Air or non-condensibles in system • Recover refrigerant, evacuate & recharge
Low head-high vapor pressures • Defective Compressor valves • Replace compressor
• Incorrect capillary tubes • Replace coil assembly
Low vapor - cool compressor - • Low evaporator airflow • Increase speed of blower or reduce restriction - replace air
iced evaporator coil filter
• Operating below 65°F outdoors • Add Low Ambient Kit
• Moisture in system • Recover refrigerant - evacuate & recharge - add filter drier
High vapor pressure • Excessive load • Recheck load calculation
• Defective compressor • Replace
Fluctuating head & vapor • Air or non-condensibles in system • Recover refrigerant, evacuate & recharge
pressures
Gurgle or pulsing noise at • Air or non-condensibles in system • Recover refrigerant, evacuate & recharge
expansion device or liquid line
Disconnect all power to unit before servicing. Contactor may break only one side. Failure to shut off power can cause electrical
shock resulting in personal injury or death.
▲▲DANGER
!

20 IM 865
ELECTRICAL WIRING DIAGRAM
208 / 230/460/575, 3 PHASE, 60 HZ.
BELT DRIVE
DUAL CIRCUIT