McQuay MPS-006AGCL10E Installation Manual

1

© 2007 McQuay International

Maverick I™
Commercial Packaged Rooftop System
Cooling Only or Cooling & Heating

Gas/Electric
Model MPS006AG
6 Tons

Installat

ion and Ma

intenance Manual

IM 861

Group: Applied Systems

Part Number: 92-102421-03-00

Date: March 2007

2 IM 861

Table of Contents

Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Checking Product Received . . . . . . . . . . . . . . . . . . . . 3

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Major Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Outside Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Attaching Exhaust and Combustion Air Inlet Hoods. . . . . . . . . . . 9

Cover Panel Installation/Conversion Procedure. . . . . . . . . . . . . . 9

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Rooftop Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Return Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Gas Supply, Condensate Drain and Piping . . . . . . . 11

Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

LP Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Adjusting or Checking Furnace Input . . . . . . . . . . . . . . . . . . . . . 12

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Hook-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Furnace Section Controls and Ignition System . . . 15

Normal Furnace Operating Sequence . . . . . . . . . . . . . . . . . . . . 15

Single Stage Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

To Start Furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

To Shut Down Furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Burners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Manual Reset Overtemperature Control . . . . . . . . . . . . . . . . . . 17

Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

System Operating Information . . . . . . . . . . . . . . . . . 17

Advise the Customer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Furnace Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cooling Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cleaning Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cleaning Condenser Coil, Condenser Fan,

Circulation Air Blower and Venturi . . . . . . . . . . . . . . . . . . . 18

Re-assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

IM 861

3

Introduction

This manual contains the installation and operating
instructions for your packaged rooftop unit. There are some
precautions that should be taken to derive maximum
satisfaction from it. Improper installation can result in
unsatisfactory operation 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
shipment. Claims for damage, either shipping or concealed,
should be filed immediately with the shipping company.

IMPORTANT: Check the unit model number, heating size,
electrical characteristics, and accessories to determine if they
are correct.

Specifications

General

The Combination Gas Heating/Electric Cooling Rooftop is
available in 100,000 & 135,000 BTU/Hr. heating inputs and
cooling capacities of 6 nominal tons of cooling. Units are
convertible from bottom supply and return to side supply and
return by relocation of supply and return air access panels. See
cover installation detail.

The units are weatherized for mounting outside of the
building.

The following information is for three phase units which are
not covered under the DOE certification program.

1 The energy consumption of the ignition system used with

this unit is 9 watts.

2 The efficiency rating of this unit is a product thermal

efficiency rating determined under continuous operating
conditions independent of any installed system.

Major Components

The unit includes two hermetically-sealed refrigerating
systems (consisting of scroll compressors, condenser coil,
evaporator coil with capillary tube assembly), a circulation air
blower, a condenser fan, a heat exchanger assembly, gas
burner and control assembly, combustion air motor and fan,
and all necessary internal electrical wiring. The cooling
system of these units is factory-evacuated, charged and
performance tested. Refrigerant amount and type are indicated
on rating plate.

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
conjunction 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
conditioner and may also endanger life and property. The
manufacturer disclaims any responsibility for such loss or
injury resulting from the use of such unauthorized
components, accessories or devices.

▲▲

DANGER

!

Recognize this symbol as an indication of
Important Safety Information!

!

Units are not design certified to be installed inside the
structure. Doing so can cause inadequate unit performance
as well as property damage and carbon monoxide
poisoning resulting in personal injury or death.

▲▲

DANGER

!

4 IM 861

Safety Information

Use only with type of gas approved for this unit. Refer to the
unit rating plate.

▲▲

WARNING

!

Install this unit only in a location and position as specified in
the location requirements and considerations section of
these instructions. Provide adequate combustion and
ventilation air to the unit space as specified in the venting
section of these instructions.

▲▲

WARNING

!

Provide adequate combustion and ventilation air to the unit
space as specified in the combustion and ventilation air
section of these instructions.

▲▲

WARNING

!

Combustion products must be discharged outdoors.
Connect this unit to an approved vent system only, as
specified in Vent Pipe Installation section of these
instructions.

▲▲

WARNING

!

Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for
the detection of leaks to check all connections, as specified
in Gas Supply and Piping section of these instructions.

▲▲

WARNING

!

Always install unit to operate within the unit's intended
temperature-rise range with a duct system which has an
external static pressure within the allowable range, as
specified in ducting section of these instructions. See also
unit rating plate.

▲▲

WARNING

!

When a unit is installed so that supply ducts carry air
circulated by the unit to areas outside the space containing
the unit, the return air shall also be handled by duct(s)
sealed to the unit casing and terminating outside the space
containing the unit.

▲▲

WARNING

!

This unit may be used to heat the building or structure
during construction if the following installation requirements
are met. Installation must comply with all installation
instructions including:

• Proper vent installation;

• Furnace operating under thermostatic control;

• Return air duct sealed to the furnace;

• Air filters in place;

• Set furnace input rate and temperature rise per rating
plate marking;

• Means of providing outdoor air required for combustion;

• Return air temperature maintained between 55°F (13°C)
and 80°F (27°C); and

• Installation of exhaust and combustion air inlet hoods
completed;

• Clean furnace, duct work and components upon
substantial completion of the construction process, and
verify furnace operating conditions including ignition, input
rate, temperature rise and venting, according to the
instructions.

▲▲

WARNING

!

IM 861

5

Figure 1: Bottom View

Figure 2: Cabinet Dimensions and Access Locations

Unit Dimensions

For clearances see page 9, Fgure 7. IMPORTANT: This unit

must be mounted level in both directions to allow water to drain
from the condenser section and condensate pan.

ST-A0801-11-00

ST-A0801-12

CONDENSER
COIL

BASE ELECTRICAL
ENTRY

BASE GAS
ENTRY

RETURN

SUPPLY

39.31

9.56

3.25

4.5

4.5

2.25

2

2

26

20

2

2

78.25

6.81

44.13

13.13

4.63

13.13

14.44

RETURN COVER/

OPTIONAL OUTDOOR

AIR HOOD LOCATION

CONDENSATE DRAIN
3/4” NPT FEMALE

BLOWER
ACCESS

COIL/FILTER
ACCESS

SUPPLY COVER

31.19

3.81

82.25

24.03

48.06

5.34

6 IM 861

Figure 3: Cabinet Dimensions and Access Locations

Figure 4: Supply and Return Dimensions for Horizontal Applications – Back View

ST-A0801-16

ST-A0801-13-00

FLUE OUTLET

SUPPLY GAS

ENTRY

1/2” NPT

COMBUSTION

AIR INLET

BURNER ACCESS

COMPRESSOR/

CONTROL BOX

ACCESS

CONTROL ENTRY

POWER ENTRY

46.5

7.22

30.25

35

81.53

17.75

14.63

12.69

RETURN

AIR

RETURN AIR FILLER

(REMOVABLE PLATE)

SUPPLY

AIR

19.125

25.13

6.84

32.72

12.25
35

5.5

12.25

82.25

4.94

IM 861

7

006AGC*10 3-60-208-230 11.2/11.2 77 2.6 3.8 34/34 40/40 40/40 BLT (4) 2 X 16.0 X 16.0 16.6 2 4000 176 690 699

(51 X 406 X 406) (1.542) (1888) (4990) (313.0) (317.1)

006AGD*10 3-60-460 5.9 39 1.0 1.9 18 20 20 BLT (4) 2 X 16.0 X 16.0 16.6 2 4000 176 690 699

(51 X 406 X 406) (1.542) (1888) (4990) (313.0) (317.1)

006AGY*10 3-60-575 4.7 31 .9 1.0 14 15 15 BLT (4) 2 X 16.0 X 16.0 16.6 2 4000 176 690 699

(51 X 406 X 406) (1.542) (1888) (4990) (313.0) (317.1)

006AGC*13 3-60-208-230 11.2/11.2 77 2.6 3.8 34/34 40/40 40/40 BLT (4) 2 X 16.0 X 16.0 16.6 2 4000 176 690 699

(51 X 406 X 406) (1.542) (1888) (4990) (313.0) (317.1)

006AGD*13 3-60-460 5.9 39 1.0 1.9 18 20 20 BLT (4) 2 X 16.0 X 16.0 16.6 2 4000 176 690 699

(51 X 406 X 406) (1.542) (1888) (4990) (313.0) (317.1)

006AGY*13 3-60-475 4.7 31 .9 1.0 14 15 15 BLT (4) 2 X 16.0 X 16.0 16.6 2 4000 176 690 699

(51 X 406 X 406) (1.542) (1888) (4990) (313.0) (317.1)

MODEL

NUMBER

MPS

PHASE

FREQUENCY

(HZ)

VOLTAGE

(VOLTS)

COMPRESSORS

RATED

LOAD

AMPERES

(RLA)

(EACH) (EACH)

LOCKED

ROTOR

AMPERES

(LRA)

DRIVE

TYPE

MINIMUM

CIRCUIT

AMPACITY

AMPERES

FULL LOAD

AMPERES

(FLA)

COND.

FAN

MTR

BLWR

MTR

FUSE OR HACR

CIRCUIT BREAKER

R22

OZ.

(G)

FILTER

RECOMMENDED

NO. AND SIZE

(MM X MM X MM)

OUTDOOR COIL

MINIMUM

AMPS

MAXIMUM

AMPS

AREA

SQ. FT

(SQ. M)

WEIGHT

NET

LB.

(KG)

SHIP

LB.

(KG)

NO.

ROWS

CFM

(L/S)

ELECTRICAL PHYSICAL

TABLE 1

MPS006A ELECTRICAL & PHYSICAL DATA

*Denotes “L” or “M” Drive Package

8 IM 861

Installation

General

1 INSTALLATION — Install this unit in accordance with

The American National Standard Z223.1-latest edition
manual entitled “National Fuel Gas Code,” and the
requirements or codes of the local utility or other
authority having jurisdiction.

Additional helpful publications available from the
“National Fire Protection Association” are: NFPA-90A ­Installation of Air Conditioning and Ventilating Systems
1985 or latest edition. NFPA-90B - Warm Air Heating
and Air Conditioning Systems 1984.

These publications are available from:

National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269

2 PRE-INSTALLATION CHECK-POINTS — Before

attempting any installation, carefully consider the
following points:

Structural strength of supporting members

(Rooftop Installation)
Clearances and provision for servicing
Power supply and wiring
Gas supply and piping
Air duct connections and sizing
Drain facilities and connections
Location for minimum noise and vibration - away from
bedroom windows

Location Considerations

The metal parts of this unit may be subject to rust or
deterioration 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 systems, and various chemical contaminants from
industries such as paper mills and petroleum refineries are
especially corrosive.

IIff tthhee uunniitt iiss ttoo bbee iinnssttaalllleedd iinn aann aarreeaa wwhheerree ccoonnttaammiinnaannttss
aarree lliikkeellyy ttoo bbee aa pprroobblleemm,, ggiivvee ssppeecciiaall aatttteennttiioonn ttoo tthhee
eeqquuiippmmeenntt llooccaattiioonn aanndd eexxppoossuurree..

1 Avoid having lawn sprinkler heads spray directly on the

unit cabinet.

2 In coastal areas locate the unit on the side of the building

away from the waterfront.

3 Shielding by a fence or shrubs may give some protection.

1 Frequent washing of the cabinet, fan blade and coil with

fresh water will remove most of the salt or other
contaminants that build up on the unit.

2 Regular cleaning and waxing of the cabinet with a good

automobile polish will provide some protection.

3 A 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.

Outside Installation

(Typical outdoor slab installation is shown in Figure 5.)

1 Select a location where external water drainage cannot

collect around unit.

2 Provide a level slab sufficiently high enough above grade

to prevent surface water from entering the unit

3 The location of the unit should be such as to provide

proper access for inspection and servicing as shown in
Figure 7.

Figure 5: Outside Slab Installation. Closet Distribution
System. Slab Floor Construction

I298

Disconnect all power to unit before starting maintenance.
Failure to do so can cause electrical shock resulting in
personal injury or death. Regular maintenance will reduce
the buildup of contaminants and help to protect the unit’s
finish.

▲▲

DANGER

!

These units are designed certified for outdoor installation
only. Installation inside any part of a structure can result in
inadequate unit performance as well as property damage.
Installation inside can also cause recirculation of flue
products into the conditioned space resulting in personal
injury or death.

▲▲

DANGER

!

IM 861

9

4 Locate unit where operating sounds will not disturb

owner or neighbors.

5 Locate 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.

6 Where snowfall is anticipated, the height of the unit

above the ground level must be considered. Mount unit
high enough to be above anticipated maximum area
snowfall and to allow combustion air to enter the
combustion air inlet.

7 Select an area which will keep the areas of the vent, air

intake, and A/C condenser fins free and clear of
obstructions such as weeds, shrubs, vines, snow, etc.
Inform the user accordingly.

Attaching Exhaust and Combustion Air Inlet
Hoods

IMPORTANT: Do not operate this unit without the exhaust/combus-

tion air inlet hood properly installed. This hood is shipped in a carton
in the blower compartment inside the unit and must be attached
when the unit is installed. See Figure 3.

To attach exhaust/combustion air inlet hood:

1 Remove screws securing blower access panel and remove

access panel. For location of blower access panel, see Figure

2.

2 Remove exhaust/combustion air inlet hood from the carton,

located inside the blower compartment.

3 Attach blower access panel.

4 Attach the combustion air inlet/exhaust hood with screws.

Reference Figure 3 for proper location. Screws are in carton
with the hood.

5 Vent the unit using the flue exhaust hood, as supplied from

the factory, without alteration or addition. The only
exception is with factory approved additions. Consult your
local utility or other authority having jurisdiction for
accepted venting techniques.

Cover Panel Installation/Conversion Procedure

Downflow to Horizontal

1 Remove the screws and covers from the outside of the

supply and return sections.

2 Install the covers in the bottom supply and return

openings with the painted side up. See Figure 6. Use the
existing gasket to seal the covers.

3 Secure the supply cover to the base of the unit with 1

screw, engaging prepunched tab in unit base.

4 Secure the return cover to the base of the unit with screws

engaging prepunched holes in the unit base.

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.

Clearances

The following minimum clearances must be observed for
proper unit performance and serviceability. Reference Figure 7.

NOTE: Supply duct may be installed with “0” inch clearance to
combustible materials, providing 1ⴖ minimum Fiberglass
insulation is applied either inside or on the outside of duct.

Recommended

Clearance

Location

48ⴖ A - Front

18ⴖ B - Condenser Coil

12ⴖ* C - Duct Side

36ⴖ D - Evaporator End

60ⴖ E - Above

*Without Economizer. 57 With Economizer

Figure 6: Cover gasket detail for units shipped for
downflow application being converted to horizontal.

I631

Figure 7: Clearances

I297

10 IM 861

Rooftop Installation

1 Before locating the unit on the roof, make sure that the

roof structure is adequate to support the weight involved.
(See Electrical & Physical Tables in this manual.) THIS

IS VERY IMPORTANT AND THE INSTALLER’S
RESPONSIBILITY.

2 For rigging and roofcurb details, see Figures 8, 9, 10 and

11.

3 The 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,
block off supply and return air openings to prevent excessive
condensation.

Ducting

The installing contractor should fabricate ductwork in
accordance with local codes. Use industry manuals 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.

Place the unit as close to the conditioned space as possible
allowing clearances as indicated. Run ducts as directly as
possible to supply and return outlets. Use of non-flammable
weatherproof flexible connectors on both supply and return
connections at unit to reduce noise transmission is
recommended.

On ductwork exposed to outside temperature and humidity,
use a minimum of 2ⴖ of insulation and a vapor barrier.
Distribution system in attic, furred space or crawl space should
be insulated with at least 2ⴖ of insulation.

1

⁄2ⴖ to 1ⴖ thick

insulation is usually sufficient for ductwork inside the air
conditioned space.

Provide balancing dampers for each branch duct in the supply
system. Properly support ductwork from the structure.

IMPORTANT: In the event that the return air ducts must be run
through an “unconfined” space containing other fuel burning
equipment, it is imperative that the owner must be informed
against future changes in construction which might change this
to a “confined space.” Also, caution the owner against any future
installation of additional equipment (within the existing
unconfined and/or confined space which might create a negative
pressure within the vicinity of other solid, liquid, or gas fueled
units.

Return Air

Figure 8: Flat rooftop installation, attic or drop ceiling
distributing system. Mounted on roofcurb. Curb must be
level.

I299

Never allow products of combustion or the flue products to
enter the return air ductwork, or the circulating air supply. All
return ductwork must be adequately sealed and secured to
the furnace with sheet metal screws, and joints taped. All
other duct joints must be secured with approved
connections and sealed airtight.

Failure to prevent products of combustion from being
circulated into the living space can create potentially
hazardous conditions, including carbon monoxide poisoning
that could result in personal injury or death.

▲▲

DANGER

!

Do not, under any circumstances, connect return ductwork
to any other heat producing device such as fireplace insert,
stove, etc. Unauthorized use of such devices may result in
fire, carbon monoxide poisoning, explosion, personal injury,
property damage or death.

▲▲

DANGER

!

I296

SPREADER BAR

A

B

D

C

LIFTING BEAM

CABLE OR CHAIN

5/8ⴖ SHACKLE

(EACH CORNER)

39ⴖ

26

1

⁄

8

CENTER

OF

GRAVITY

CORNER WEIGHTS BY PERCENTAGE

AB C D

23% 29% 21% 27%

Figure 9: Lifting Detail

IM 861

11

Figure 11: Roofcurb

ST-A0801-20-01

SUPPLY

RETURN

NAILING STRIP

OVERHANG

THIS END

ONLY

6-1/4ⴖ

*

NOTE

RETURN DUCT*

SUPPLY DUCT*

GASKET
(FULL PERIMETER
AND ON DIVIDERS.
MUST BE ABOVE DUCT
AND INSULATION
PANEL FLANGES.)

INSULATION PANELS

ST-A0801-20-01

ROOFTOP UNIT

COUNTER FLASHING*

INSULATION*

1/4ⴖ TYP (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) LCS.

UNIT

NOTE: Remove
shipping boards
from unit before
installing on the
roofcurb.

Figure 10: Roofcurb

Gas Supply, Condensate Drain
and Piping

Gas Connection

IMPORTANT: Connect this unit only to gas supplied by a

commercial utility.

1 Install gas piping in accordance with local codes and

regulations of the local utility company. In the absence of
local codes, the installation must conform to the
specifications of the National Fuel Gas Code, ANSI
Z223.1 - latest edition.

NOTE: The use of flexible gas connectors is not
permitted.

2 Connect the gas line to the gas pipe inlet opening

provided into the 1/2ⴖ inlet valve. See Figure 5 or 8 for
typical piping.

3 Size the gas line to the furnace adequate enough to

prevent undue pressure drop and never less than 1/2ⴖ.

4 Install a drip leg or sediment trap in the gas supply line as

close to the unit as possible.

5 Install an outside ground joint union to connect the gas

supply to the control assembly at the burner tray.

6 Gas valves have been factory installed. Install a manual

gas valve where local codes specify a shut-off valve
outside the unit casing. (See Figure 12.)

7 Make sure piping is tight. A pipe compound resistant to

the action of liquefied petroleum gases must be used at
all threaded pipe connections.

8 IMPORTANT: Any additions, changes or conversions

required for the furnace to satisfactorily meet the application
should be made by a qualified installer, service agency or

the gas supplier, using factory-specified or approved parts.
In the commonwealth of Massachusetts, installation must
be performed by a licensed plumber or gas fitter for
appropriate fuel.

IMPORTANT: Disconnect the furnace and its individual shutoff
valve from the gas supply piping during any pressure testing of
that system at test pressures in excess of 1/2 pound per square
inch gauge or isolate the system from the gas supply piping
system by closing its individual manual shutoff valve during any
pressure testing of this gas supply system at pressures equal to
or less than 1/2 PSIG.

TO CHECK FOR GAS LEAKS, USE A SOAP AND
WATER SOLUTION OR OTHER APPROVED
METHOD. DO NOT USE AN OPEN FLAME.

Figure 12: Suggested Gas Piping

FROM GAS
METER

*

Factory supplied grommet must be utilized.

MANUAL GAS
SHUT-OFF
VALV E

UNIT GAS SUPPLY
CONNECTION

*

ROOF OR GROUND LEVEL INSTALLATION

Do not use an open flame to check for leaks. The use of an
open flame can result in fire, explosion, property damage,
personal injury or death.

▲▲

DANGER

!

IMPORTANT: Check the rating plate to make certain the unit is
equipped to burn the type of gas supplied. Care should be taken
after installation of this equipment that the gas control valve not
be subjected to high gas supply line pressure.

In making gas connections, avoid strains as they may cause
noise and damage the controls. A backup wrench is required to
be used on the valve to avoid damage.

The capacities of gas pipe of different diameters and lengths in
cu. ft. per hr. with pressure drop of 0.3 in. and specific gravity
of 0.60 (natural gas) are shown in Table 2.

After determining the pipe length, select the pipe size which
will provide the minimum cubic feet per hour required for the
gas input rating of the furnace. By formula:

Gas Input of Furnace
(BTU/HR)

Cu. Ft. Per Hr. Required =

Heating Value of Gas

(BTU/FT3)

The gas input of the furnace is marked on the furnace rating
plate. The heating value of the gas (BTU/FT3) may be
determined by consulting the local natural gas utility or the
L.P. gas supplier.

LP Conversion

Convert the valve to use liquefied petroleum (LP) gas by
replacing the pressure regulator spring with the conversion kit
spring. This LP kit spring allows the regulator to maintain the
proper manifold pressure for LP gas. The correct burner LP
orifices are included in the kit. See Figure 13.

IMPORTANT: To remove the gas valve, remove the four screws
securing the manifold pipe to the burner tray. Remove the manifold
pipe with gas valve attached. See Figure 14.

NOTE: Order the correct LP conversion kit from the furnace
manufacturer. See Conversion Kit Index shipped with unit for

proper LP kit number. Furnace conversion to LP gas must
be performed by a qualified technician.

Adjusting or Checking Furnace Input

– Natural Gas Line Pressure 5ⴖ - 10.5ⴖ W.C.
– LP Gas Line Pressure 11ⴖ - 13ⴖ W.C.

– Natural Gas Manifold Pressure 3.5ⴖ W.C
– LP Gas Manifold Pressure - 10ⴖ W.C.

Supply and manifold pressure taps are located on the gas valve
body 1/8ⴖ N.P.T. and on the manifold.

Use a properly calibrated manometer gauge for accurate gas
pressure readings.

Only small variations in the gas flow should be made by
means of the pressure regulator adjustment. Furnaces
functioning on LP gas must be set by means of the tank or
branch supply regulators. The furnace manifold pressure
should be set at 10ⴖ W.C. at the gas control valve.

To adjust the pressure regulator, remove the regulator cap and
turn the adjustment screw clockwise to increase pressure or
counterclockwise to decrease pressure. Then replace the

regulator cap securely.

Any necessary major changes in the gas flow rate should be
made by changing the size of the burner orifices. To change
orifice spuds, shut off the manual main gas valve and remove
the gas manifold.

For elevations up to 2,000 feet, rating plate input ratings
apply. For high altitudes (elevations over 2,000 ft.), see
conversion kit index 92-21519-XX for derating and orifice
spud sizes.

Check of input is important to prevent over-firing of the
furnace beyond its design-rated input. NEVER SET
INPUT ABOVE THAT SHOWN ON THE RATING
PLATE. Use the following table or formula to determine
input rate.

Heating Value of Gas
(BTU/Cu. Ft.) x 3600

Cu. Ft. Per Hr. Required =

Time in Seconds

(for 1 Cu. Ft.) of Gas

Start the furnace and measure the time required to burn one
cubic foot of gas. Prior to checking the furnace input, make
certain that all other gas units are shut off, with the exception
of pilot burners. Time the meter with only the furnace in
operation.

12 IM 861

Nominal

Iron Pipe

Size,

Inches

Equivalent Length of Pipe, Feet

10 20 30 40 50 60 70 80

1

⁄2 132 92 73 63 56 50 46 43

3

⁄4 278 190 152 130 115 105 96 90

1 520 350 285 245 215 195 180 170
11⁄4 1,050 730 590 500 440 400 370 350
11⁄2 1,600 1,100 890 760 670 610 560 530

Table 2: Gas Pipe Capacity Table (Cu. Ft./Hr.)

This unit is equipped at the factory for use on natural gas
only. Conversion to LP gas requires a special kit supplied by
the distributor or manufacturer. Mailing addresses are listed
on the furnace rating plate, parts list and warranty. Failure to
use the proper conversion kit can cause fire, carbon
monoxide poisoning, explosion, personal injury, property
damage or death.

▲▲

DANGER

!

Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied
petroleum gases (at 11 inches water column inlet pressure).

(Based on a Pressure Drop of 0.5 Inch Water Column)

Table 3: LP Gas Pipe Capacity Table (Cu. Ft./Hr.)

Nominal
Iron Pipe
Size, Inches

10 20 30 40 50 60 70 80 90 100 125 150

275 189 152 129 114 103 96 89 83 78 69 63

567 393 315 267 237 217 196 182 173 162 146 132
1,071 732 590 504 448 409 378 346 322 307 275 252
2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496

1/2
3/4

1
1-1/4
1-1/2

2

Length of Pipe, Feet

Example (LP): Input BTU requirement of unit, 150,000

Equivalent length of pipe, 60 ft. = 3/4ⴖ IPS required.

IM 861

13

IMPORTANT NOTE FOR ALTITUDES ABOVE 2,000 FEET (610
METERS): The main burner orifices in your furnace and in these

kits are sized for the nameplate input and intended for
installations at elevations up to 2,000 feet in the USA or Canada,
or for elevations of 2,000 - 4,500 feet (610 -1,373 meters) in
Canada if the unit has been derated at the factory. For elevations
above 2,000 feet (610 meters) IN THE USA ONLY (see ANSI-
Z223.1), the burner orifices must be sized to reduce the input 4%
for each 1,000 feet (305 meters) above sea level.

NOTICE: Derating of the heating input for high altitude in the
field is unlawful in canada (refer to can/cga 2.17). Units installed
in altitudes greater than 2,000 feet (610 meters) must be shipped
from the factory or from a factory authorized conversion station
with the heating input derated by 10% so as to operate properly
in altitudes from 2,000 - 4,500 feet (610 - 1,373 meters).

Condensate Drain

The condensate drain connection of the evaporator is threaded
3/4ⴖ nominal P.V.C. pipe. IMPORTANT: Install a condensate

trap to ensure proper condensate drainage. See Figure 15.

Wiring

Power Supply

1 All wiring should be made in accordance with the

National Electrical Code. Consult the local power

company to determine the availability of sufficient power
to operate the unit. Check the voltage at power supply to
make sure it corresponds to the unit’s RATED
VOLTAGE REQUIREMENT. Install a branch circuit
disconnect near the rooftop, in accordance with the
N.E.C., C.E.C. or local codes. A bracket is provided with
the unit for mounting of the disconnect. See Figure 16.

2 It is important that proper electrical power is available at

the unit. Voltage should not vary more than 10% from
that stamped on the unit nameplate. On three phase units,
phases must be balanced within 3%.

3 For branch circuit wiring (main power supply to unit

disconnect), the minimum wire size for the length of run
can be determined from Table 5 using the circuit

Figure 13: LP Conversion Kit Figure 14

MANIFOLD PIPE

ONE 1 21 1 30 1 34 1 39 3 45

40,000

TEN 13 30 15 0 15 36 16 30 37 30

ONE 0 54 1 0 1 3 1 6 2 30

60,000

TEN 9 0 10 0 10 24 11 0 25 0

ONE 0 41 0 45 0 47 0 50 1 53

80,000

TEN 6 45 7 30 7 48 8 15 18 45

ONE 0 33 0 36 0 38 0 40 1 30

100,000

TEN 5 24 6 0 6 15 6 36 15 0

METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL

OR LP GAS

INPUT

BTU/HR

METER

SIZE

CU. FT.

HEATING VALUE OF GAS BTU PER CU. FT.

900 1000 1040 1100 2500

MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.

Table 4

Figure 15: Condensate Drain

DO NOT OVERTIGHTEN DRAIN FITTING

Turn off the main electrical power at the branch circuit

disconnect closest to the unit before attempting any wiring.

Failure to do so can cause electrical shock resulting in

personal injury or death.

▲▲

DANGER

!

ampacity found on the unit rating plate. Use the smallest
wire size allowable in Table 5 from the unit disconnect to
unit.

NOTE: A bracket is provided with the unit for mounting the
branch circuit disconnect to the unit. This is the
recommended location for the disconnect. See Figure 16.

4 For through the base wiring entry reference Figure 17.

All fittings and conduit are field supplied for this
application. Reference the chart with Figure 17 for
proper hole and conduit size.

NOTES:

1 Wire size based on 60°C rated wire insulation and 30°C

Ambient Temp. (86°F).

2 For more than 3 conductors in a raceway or cable, see the

N.E.C. for derating the ampacity of each conductor.

When installed, the unit must be electrically grounded in
accordance with local codes or, in the absence of local
codes, with the National Electrical Code, ANSI/NFPA 70, if
an external electrical source is utilized.

IMPORTANT: This unit is approved for use with copper

conductors only

connected to unit contactor.

Warranty will be voided if aluminum wire is connected to unit
contactor.

Hook-Up

To wire unit, refer to the following hook-up diagram.

Refer to Figures 3 and 17 for location of wiring entrances.

Wiring to be done in the field between the unit and devices not
attached to the unit, or between separate devices which are
field installed and located, shall conform with the temperature
limitation for Type T wire [63°F rise (35°C)] when installed in
accordance with the manufacturer’s instructions.

Internal Wiring

IMPORTANT: Some single phase units are equipped with a
single pole contactor. Caution must be exercised when servicing
as only one leg of the power supply is broken with the contactor.

A diagram of the internal wiring of this unit is located under
the electrical box cover and this manual. If any of the original
wire as supplied with the unit must be replaced, the wire
gauge and insulation must be same as original wiring.

Transformer is factory wired for 230 volts on 208/230 volt
models and must be changed for 208 volt applications. See
unit wiring diagram for 208 volt wiring.

14 IM 861

200 6 4 4 4 3 3 2 2

150 8 6 6 4 4 4 3 3

100 10 8 8 6 6 6 4 4

50 14 12 10 10 8 8 6 6

15 20 25 30 35 40 45 50

BRANCH CIRCUIT AMPACITY

SUPPLY WIRE

LENGTH-FEET

*Taken from National Electric Code

COPPER WIRE SIZE
(BASED ON 1% VOLTAGE DROP)*

Figure 16: Recommended Branch Circuit Disconnect
Location

TO POWER

TO THERMOSTAT

BRANCH
CIRCUIT
DISCONNECT

I317A

Table 5: Branch Circuit

IM 861

15

WIRE SIZE, AWG

Thermostat

The room thermostat must be compatible with the spark
ignition control on the unit. Generally, all thermostats that are
not of the “current robbing” type are compatible with the
integrated furnace control. The low voltage wiring should be
sized as shown in Table 6.

Install the room thermostat in accordance with the instruction
sheet packed in the box with the thermostat.

Furnace Section Controls and
Ignition System

Normal Furnace Operating Sequence

Single Stage Gas Valve

This unit is equipped with an integrated direct spark ignition
control.

1 The thermostat calls for heat.

2 The control board will run a self check to verify that the limit

control and manual reset overtemperature control are closed
and that the pressure switch is open.

3 Upon closure of the pressure switch, the control board

energizes the induced draft blower for a 15 second prepurge.

4 After the 15 second prepurge, the gas valve opens and the

spark is initiated for 7 second trial for ignition.

5 Burners ignite and flame sensor proves all burners have lit.

6 The circulating air blower is energized after 30 seconds.

7 The control board enters a normal operation loop in which all

safety controls are monitored continuously.

Figure 17: Through Base Electrical Connection

Figure 18: Typical Thermostat Wiring

14

1/2ⴖ
7/8ⴖ

12

1/2ⴖ
7/8ⴖ

10

1/2ⴖ
7/8ⴖ

8

3/4ⴖ

1-31/32ⴖ

6

1ⴖ

1-23/64ⴖ

4

1ⴖ

1-23/64ⴖ

3

1-1/4ⴖ

1-23/32ⴖ

2

1-1/4ⴖ

1-23/32ⴖ

1

1-1/2ⴖ

1-31/32ⴖ

0

1-1/2ⴖ

1-31/32ⴖ

00

2ⴖ

2-15/32ⴖ

000

2ⴖ

2-15/32ⴖ

CONDUIT SIZE

HOLE SIZE

I658

NOTES: 1. DETERMINE REQUIRED WIRE SIZE FROM MINIMUM CIRCUIT AMPACITY SHOWN IN INSTALLATION & OPERATING INSTRUCTION.

2. BOTTOM POWER ENTRY WILL NOT ACCOMMODATE WIRE LARGER THAN #2 AWG (SHADED AREA).

Table 6

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
thermostat and back to the furnace.

NOTE: DO NOT USE CONTROL WIRING SMALLER THAN NO. 18
AWG.

16 IM 861

8 Thermostat is satisfied and opens.

9 The gas valve is de-energized and closes, shutting down the

burner flame.

10 The control board will de-energize the inducer after a five

second post purge.

11 The circulating air blower is de-energized after 90 seconds.

The integrated control is a three ignition system.

After a total of three cycles without sensing main burner
flame, the system goes into a 100% lockout mode. After one
hour, the ignition control repeats the prepurge and ignition
cycles for 3 tries and then go into 100% lockout mode again. It
continues this sequence of cycles and lockout each hour until
ignition is successful or power is interrupted. During the
lockout mode, neither the ignitor or gas valve will be
energized until the system is reset by turning the thermostat to
the “OFF” position or interrupting the electrical power to the
unit for 3 seconds or longer. The induced draft blower and
main burner will shut off when the thermostat is satisfied.

The circulating air blower will start and run on the heating
speed if the thermostat fan switch is in the “ON” position.

The integrated furnace control is equipped with diagnostic
LED. The LED is lit continuously when there is power to the
control, with or without a call for heat. If the LED is not lit,
there is either no power to the control or there is an internal
component failure within the control, and the control should
be replaced.

If the control detects the following failures, the LED will flash
on for approximately 1/4 second, then off for 3/4 second for
designated failure detections.

1 Flash: Failed to detect flame within the three tries for

ignition.

2 Flash: Pressure switch or induced draft blower problem

detected.

3 Flash: High limit or auxiliary limit open.

4 Flash: Flame sensed and gas valve not energized or flame

sensed with no “W” signal.

5 Flash: Overtemperature switch open.

Operating Instructions

This unit is equipped with integrated furnace control. This
device lights the main burners each time the room thermostat
(closes) calls for heat. See operating instructions on the back
of the furnace/controls access panel.

To Start The Furnace

1. STOP! Read the safety information on the Operating
Instructions Label located on this unit.

2 Set the thermostat to its lowest setting.
3 Turn off all electric power to the unit.
4 This unit does not have a pilot. It is equipped with an

ignition device which automatically lights the burner. Do
NOT

try to light the burner by hand.

5 Remove control door/access panel.
6 Move switch to the “OFF” position.
7 Wait five (5) minutes to clear out any gas. Then smell for

gas, including near the floor. If you smell gas, STOP!

• Do not try to light any unit.

• Do not touch any electric switch; do not use any phone

in your buiding.

• Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire

department.

If you don’t smell gas, go to the next step.

8 Move from “OFF” position to “ON” position.

9 Replace the control door.
10 Turn on all electric power to the unit.
11 Set the thermostat to the desired setting.
12 If the unit will not operate, follow the instructions below on

how to shut down the furnace.

The initial start-up on a new installation may require the
control system to be energized for some time until air has bled
through the system and fuel gas is available at the burners.

To Shut Down Furnace

1 Set the thermostat to the lowest setting.

2 Turn off all electric power to the unit if service is to be

performed.

3 Remove control door.

4 Move switch to the “OFF” position.

5 Replace control door.

Do not attempt to manually light this furnace with a match or
any open flame. Attempting to do so can cause an
explosion or fire resulting in property damage, personal
injury or death.

▲▲

DANGER

!

If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.

▲▲

DANGER

!

The spark ignitor and ignition lead from the ignition control
are high voltage. Keep hands or tools away to prevent
electrical shock. Shut off electrical power before servicing
any of the controls. Failure to adhere to this warning can
result in personal injury or death.

▲▲

DANGER

!

IM 861

17

Burners

Burners for these units have been designed so that field
adjustment is not required. Burners are tray-mounted and
accessible for easy cleaning when required.

Manual Reset Overtemperature Control

Two manual reset overtemperature controls are located on the
burner shield. These devices senses blockage in the heat
exchanger or insufficient combustion air. This shuts off the
main burners if excessive temperatures occur in the burner
compartment.

Operation of this control indicates an abnormal condition.
Therefore, the unit should be examined by a qualified installer,
service agency, or the gas supplier before being placed back
into operation.

Pressure Switch

This furnace has a pressure switch for sensing a blocked
exhaust or a failed induced draft blower. It is normally open
and closes when the induced draft blower starts, indicating air
flow through the combustion chamber.

Limit Control

The supply air high temperature limit cut-off is set at the
factory and cannot be adjusted. It is calibrated to prevent the
air temperature leaving the furnace from exceeding the
maximum outlet air temperature.

IMPORTANT: Replace this control only with the identical
replacement part.

System Operating Information

Advise The Customer

1 Change the air filters regularly. The heating system

operates better, more efficiently and more economically.

2 Except for the mounting platform, keep all combustible

articles three feet from the unit and exhaust system.

3 IMPORTANT: Replace all blower doors and

compartment cover after servicing the unit. Do not operate
the unit without all panels and doors securely in place.

4 Do not allow snow or other debris to accumulate in the

vicinity of the unit.

Furnace Section

Maintenance

The unit’s furnace should operate for many years without
excessive scale build-up in flue passageways; however, it is
recommended that a qualified installer, service agency, or the
gas supplier annually inspect the flue passageways, the
exhaust system and the burners for continued safe operation,
paying particular attention to deterioration from corrosion or
other sources.

If during inspection the flue passageways and exhaust system
are determined to require cleaning, the following procedures
should be followed (by a qualified installer, service agency,

or gas supplier):

1 Turn off the electrical power to the unit and set the

thermostat to the lowest temperature.

2 Shut off the gas supply to the unit either at the meter

or at manual valve in the supply piping.

3 Remove the furnace controls access panel and the control

box cover.

4 Disconnect the gas supply piping from the gas valve.
5 Disconnect the wiring to the induced draft blower motor,

gas valve, flame sensor, and flame roll-out control, and
ignitor cable. Mark all wires disconnected for proper

reconnection.

6 Remove the screws (4) connecting the burner tray to the

heat exchanger mounting panel.

7 Remove the burner tray and the manifold assembly from

the unit.

8 Remove the screws (5) connecting the induced draft

blower to the collector box and screws (18) connecting the
collector box to the heat exchanger center panel. Remove
the induced draft blower and the collector box from the
unit.

Do not jumper this device! Doing so can cause a fire or
explosion resulting in property damage, personal injury or
death.

▲▲

DANGER

!

Should overheating occur or the gas supply fail to shut off,
shut off the manual gas valve to the unit before shutting off
the electrical supply. Failure to do so can result in an
explosion or fire causing property damage, severe personal
injury or death!

▲▲

DANGER

!

DO NOT JUMPER THIS DEVICE! DO NOT reset the
overtemperature control without taking corrective action to
assure that an adequate supply of combustion air is
maintained under all conditions of operation. Failure to do
so can result in carbon monoxide poisoning or death.
Replace this control only with the identical replacement part.

▲▲

DANGER

!

Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation resulting in fire, electrical shock, property
damage, personal injury or death.

▲▲

DANGER

!

18 IM 861

9 Remove the screws (3) connecting the divider plate to the

heat exchanger center panel.

10 Remove the turbulators from inside the heat exchangers by

inserting the blade of a screwdriver under the locking tabs.
Pop the tabs out of the expanded grooves of the heat
exchanger. Slide the turbulators out of the heat
exchangers.

11 Direct a water hose into the outlet of the heat exchanger

top. Flush the inside of each heat exchanger tube with
water. Blow out each tube with air to remove excessive
moisture.

12 Reassemble (steps 1 through 10 in reverse order). Be

careful not to strip out the screw holes used to mount
the collector box and inducer blower. Replace inducer
blower gasket and collector box gasket with factory
replacements if damaged.

The manufacturer recommends that a qualified installer,
service agency or the gas supplier visually inspect the burner
flames for the desired flame appearance at the beginning of
the heating season and approximately midway in heating
season.

The manufacturer also recommends that a qualified installer,
service agency or the gas supplier clean the flame sensor with
steel wool at the beginning of the heating season.

Lubrication

IMPORTANT: DO NOT attempt to lubricate the bearings on the
blower motor or the induced draft blower motor. Addition of
lubricants can reduce the motor life and void the warranty.

The blower motor and induced draft blower motor are
prelubricated by the manufacturer and do not require further
attention.

A qualified installer, service agency or the gas supplier must
periodically clean the motors to prevent the possibility of
overheating due to an accumulation of dust and dirt on the
windings or on the motor exterior. And, as suggested
elsewhere in these instructions, the air filters should be kept
clean because dirty filters can restrict air flow and the motor
depends upon sufficient air flowing across and through it to
prevent overheating.

Cooling Section

Maintenance

It is recommended that at the beginning of each cooling
season a qualified installer or service agency inspect and clean
the cooling section of this unit. The following areas should be
addressed: evaporator coil. condenser coil, condenser fan
motor and venturi area.

To inspect the evaporator coil:

1 Remove the filter access panel and the blower/evaporator

coil access panel. Remove the filters

2 Shine a flashlight on the evaporator coil (both sides) and

inspect for accumulation of lint, insulation, etc.

3 If coil requires cleaning, follow the steps shown below.

Cleaning Evaporator Coil

1 The coil should be cleaned when it is dry. If the coil is

coated with dirt or lint, vacuum it with a soft brush
attachment. Be careful not to bend the coil fins.

2 If the coil is coated with oil or grease, clean it with a mild

detergent-and-water solution. Rinse the coil thoroughly
with water. IMPORTANT: Do not use excessive water

pressure. Excessive water pressure can bend the fins and
tubing of the coil and lead to inadequate unit performance.
Be careful not to splash water excessively into unit.

3 Inspect the drain pan and condensate drain at the same

time the evaporator coil is checked. Clean the drain pan by
flushing with water and removing any matters of
obstructions which may be present.

4 Go to next section for cleaning the condenser coil.

Cleaning Condenser Coil, Condenser Fan,
Circulation Air Blower and Venturi

1 Remove the compressor access panel. Disconnect the

wires to the condenser fan motor in the control box (see
wiring diagram). Remove the wires from the opening in
the bottom of the control box.

2 Remove the screws securing the condenser top panel and

remove the panel with condenser fan motor and grille
attached.

Holes in the exhaust transition or heat exchanger can cause
toxic fumes to enter the home. The exhaust transition or
heat exchanger must be replaced if they have holes or
cracks in them. Failure to do so can cause carbon
monoxide poisoning resulting in personal injury or death.

▲▲

DANGER

!

Disconnect main electrical power to the unit before
attempting maintenance. Failure to do so may result in
electrical shock or severe personal injury or death.

▲▲

DANGER

!

Disconnect main electrical power to the unit before
attempting maintenance. Failure to do so can cause
electrical shock resulting in severe personal injury or death.

▲▲

DANGER

!

Label all wires prior to disconnection when servicing the
unit. Wiring errors can cause improper and dangerous
operation resulting in fire, electrical shock, property
damage, severe personal injury or death.

▲▲

DANGER

!

IM 861

19

3 The coil should be cleaned when it is dry. If the coil is

coated with dirt or lint, vacuum it with a soft brush
attachment. Be careful not to bend the coil fins.

4 If the coil is coated with oil or grease, clean it with a mild

detergent-and-water solution. Rinse the coil thoroughly
with water. IMPORTANT: Do not use excessive water

pressure. Excessive water pressure can bend the fins and
tubing of the coil and lead to inadequate unit performance.
Be careful not to splash water excessively into unit.

5 The venturi should also be inspected for items of

obstruction such as collections of grass, dirt or spider
webs. Remove any that are present.

6 Inspect the circulating air blower wheel and motor for

accumulation of lint, dirt or other obstruction and clean if
necessary. Inspect the blower motor mounts and the
blower housing for loose mounts or other damage. Repair
or replace if necessary.

Re-assembly

1 Place the condenser top panel back on the unit and replace

all screws.

2 Run the fan motor wires through the hole in the bottom of

the control box. Reconnect fan motor wires per the wiring
diagram attached to the back of the cover.

3 Replace the filter and blower/evaporator coil access

panels.

4 Replace the control box cover and controls access panel.

5 Restore electrical power to the unit and check for proper

operation, especially the condenser fan motor.

Replacement Parts

To find your local McQuay Certified Parts Distributor, go to
www.mcquay.com and select Parts Locator.

Troubleshooting

Refer to Figures 19 and 20 for determining cause of unit
problems.

Wiring Diagrams

Figures 21 and 22 are complete wiring diagrams for the unit
and its power sources. Also located on back of compressor
access panel.

Charging

See Figures 23 and 24 for proper charging information.

20 IM 861

AIR-FLOW PERFORMANCE – 6 TON BELT DRIVE

TABLE 7

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

——

——

——

——

——

CAPACITY: 6 TON

VOLTAGE: 208/230 - 460 & 575 - 3 PHASE

EXTERNAL STATIC PRESSURE

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 6.4ⴖ PITCH DIAMETER 6.4ⴖ PITCH DIAMETER

MOTOR SHEAVE 2.8ⴖ - 3.8ⴖ PITCH DIAMETER 3.4ⴖ - 4.4ⴖ PITCH 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 1ⴖ 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”

IM 861

21

General Data

Nominal Sizes 6 Tons [21.1 kW] ASHRAE 90.1-2004 Compliant Models

[] Designates Metric Conversions

Model MPS- 006AGCL10E 006AGCL13E 006AGCM10E 006AGCM13E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 75,000 [22] 75,000 [22] 75,000 [22] 75,000 [22]
EER/SEER

2

10.3/NA 10.3/NA 10.3/NA 10.3/NA
Nominal CFM/ARI Rated CFM [L/s] 2400/2400 [1133/1133] 2400/2400 [1133/1133] 2400/2400 [1133/1133] 2400/2400 [1133/1133]
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 [15.5] 53,000 [15.5] 53,000 [15.5] 53,000 [15.5]

Integrated Part Load Value

3

11.5 11.5 11.5 11.5

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] 100,000 [29.3] 135,000 [39.6] 100,000 [29.3] 135,000 [39.6]
Heating Output Btu [kW] 81,000 [23.7] 109,400 [32.1] 81,000 [23.7] 109,400 [32.1]
Temperature Rise Range ˚F [˚C] 20-50 [11.1/27.8] 30-60 [16.7/33.3] 20-50 [11.1/27.8] 30-60 [16.7/33.3]

Net Weight lbs. [kg] 608 [276] 608 [276] 615 [279] 615 [279]

Steady State Efficiency (%) 81 81 81 81

AFUE % 80 80 80 80

No. Burners 5 6 5 6
No. Stages 1 1 1 1
Gas Connection Pipe Size in. [mm] 0.5 [12.7] 0.5 [12.7] 0.5 [12.7] 0.5 [12.7]

Compressor

Qty./Type 1/Scroll 1/Scroll 1/Scroll 1/Scroll

Outdoor Sound Rating (dB)

5

83 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 [5.6] 19,000 [5.6] 19,000 [5.6] 19,000 [5.6]

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] 1/11x12 [279.4x304.8] 1/11x12 [279.4x304.8] 1/11x12 [279.4x304.8] 1/11x12 [279.4x304.8]
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 56 56 56 56

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] 615 [279] 615 [279] 608 [276] 608 [276]

Net System Power kW 7 7 7 7

CONTINUED

NOTES:

1. Cooling Performance is rated 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 is net and includes the effect of fan motor heat. Units are suitable
for operation to

20% of nominal cfm. Units are certified in accordance with the Unitary Air Conditioner Equipment

certification program, which is based on ARI Standard 210/240 or 360.

2. EER and/or SEER are rated at ARI conditions and in accordance with DOE test procedures.

3. Integrated Part Load Value is rated in accordance with ARI Standard 210/240 or 360. Units are rated at 80° F ambient,
80° F entering dry bulb, and 67° F entering wet bulb at ARI rated cfm.

4. Heating Performance limit settings and rating data were established and approved under laboratory test conditions
using American National Standard Institute standards. Ratings shown are for elevations up to 2000 feet. For elevations
above 2000 feet, ratings

should be reduced at the rate of 4% for each 1000 feet above sea level.

5. Outdoor Sound Rating shown is tested in accordance with ARI Standard 270.

22 IM 861

General Data

Nominal Sizes 6 Tons [21.1 kW] ASHRAE 90.1-2004 Compliant Models

[] Designates Metric Conversions

Model MPS- 006AGDL10E 006AGDL13E 006AGDM10E 006AGDM13E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 75,000 [22] 75,000 [22] 75,000 [22] 75,000 [22]
EER/SEER

2

10.3/NA 10.3/NA 10.3/NA 10.3/NA
Nominal CFM/ARI Rated CFM [L/s] 2400/2400 [1133/1133] 2400/2400 [1133/1133] 2400/2400 [1133/1133] 2400/2400 [1133/1133]
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 [15.5] 53,000 [15.5] 53,000 [15.5] 53,000 [15.5]

Net System Power kW 7 7 7 7

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] 100,000 [29.3] 135,000 [39.6] 100,000 [29.3] 135,000 [39.6]
Heating Output Btu [kW] 81,000 [23.7] 109,400 [32.1] 81,000 [23.7] 109,400 [32.1]
Temperature Rise Range ˚F [˚C] 20-50 [11.1/27.8] 30-60 [16.7/33.3] 20-50 [11.1/27.8] 30-60 [16.7/33.3]

Net Weight lbs. [kg] 608 [276] 608 [276] 608 [276] 608 [276]

Steady State Efficiency (%) 81 81 81 81

AFUE % 80 80 80 80

No. Burners 5 6 5 6
No. Stages 1 1 1 1
Gas Connection Pipe Size in. [mm] 0.5 [12.7] 0.5 [12.7] 0.5 [12.7] 0.5 [12.7]

Compressor

Qty./Type 1/Scroll 1/Scroll 1/Scroll 1/Scroll

Outdoor Sound Rating (dB)

5

83 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 [5.6] 19,000 [5.6] 19,000 [5.6] 19,000 [5.6]

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] 1/11x12 [279.4x304.8] 1/11x12 [279.4x304.8] 1/11x12 [279.4x304.8] 1/11x12 [279.4x304.8]
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 56 56 56 56

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] 615 [279] 615 [279] 615 [279] 615 [279]

Integrated Part Load Value

3

11.5 11.5 11.5 11.5

CONTINUED

NOTES:

1. Cooling Performance is rated 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 is net and includes the effect of fan motor heat. Units are suitable
for operation to

20% of nominal cfm. Units are certified in accordance with the Unitary Air Conditioner Equipment

certification program, which is based on ARI Standard 210/240 or 360.

2. EER and/or SEER are rated at ARI conditions and in accordance with DOE test procedures.

3. Integrated Part Load Value is rated in accordance with ARI Standard 210/240 or 360. Units are rated at 80° F ambient,
80° F entering dry bulb, and 67° F entering wet bulb at ARI rated cfm.

4. Heating Performance limit settings and rating data were established and approved under laboratory test conditions
using American National Standard Institute standards. Ratings shown are for elevations up to 2000 feet. For elevations
above 2000 feet, ratings

should be reduced at the rate of 4% for each 1000 feet above sea level.

5. Outdoor Sound Rating shown is tested in accordance with ARI Standard 270.

IM 861

23

General Data

Nominal Sizes 6 Tons [21.1 kW] ASHRAE 90.1-2004 Compliant Models

[ ] Designates Metric Conversions

Model MPS- 006AGYL13E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 75,000 [22]
EER/SEER

2

10.3/NA
Nominal CFM/ARI Rated CFM [L/s] 2400/2400 [1133/1133]
ARI Net Cooling Capacity Btu [kW] 72,000 [21.1]
Net Sensible Capacity Btu [kW] 53,000 [15.5]

Net System Power kW 7

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] 135,000 [39.6]
Heating Output Btu [kW] 109,400 [32.1]
Temperature Rise Range ˚F [˚C] 30-60 [16.7/33.3]

Net Weight lbs. [kg] 608 [276]

Steady State Efficiency (%) 81

AFUE % 80

No. Burners 6
No. Stages 1
Gas Connection Pipe Size in. [mm] 0.5 [12.7]

Compressor

Qty./Type 2/Scroll

Outdoor Sound Rating (dB)

5

83

Outdoor Coil—Fin Type Louvered

Tube Type Rifled
Tube Size in. [mm] OD 0.375 [9.5]
Face Area sq. ft. [sq. m] 16.56 [1.54]
Rows / FPI [FPcm] 2 / 22 [9]

Net Latent Capacity Btu [kW] 19,000 [5.6]

Indoor Coil—Fin Type Louvered

Tube Type Rifled
Tube Size in. [mm] 0.375 [9.5]
Face Area sq. ft. [sq. m] 6.5 [0.6]
Rows / FPI [FPcm] 4 / 12 [5]
Refrigerant Control Capillary Tubes
Drain Connection No./Size in. [mm] 1/1 [25.4]

Outdoor Fan—Type Propeller

No. Used/Diameter in. [mm] 1/24 [609.6]
Drive Type/No. Speeds Direct/1
CFM [L/s] 4000 [1888]
No. Motors/HP 1 at 1/3 HP
Motor RPM 1075

Indoor Fan—Type FC Centrifugal

No. Used/Diameter in. [mm] 1/11x12 [279.4x304.8]
Drive Type/No. Speeds Belt/Variable
No. Motors 1
Motor HP 11/2
Motor RPM 1725
Motor Frame Size 56

Filter—Type Disposable

Furnished Yes
(No.) Size Recommended in. [mm] (4)2x16x16 [51x406x406]

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 88/88 [2495/2495]
Weights

Ship Weight lbs. [kg] 615 [279]

Integrated Part Load Value

3

11.5

006AGYM13E

75,000 [22]

10.3/NA

2400/2400 [1133/1133]

72,000 [21.1]
53,000 [15.5]

7

135,000 [39.6]
109,400 [32.1]

30-60 [16.7/33.3]

608 [276]

81

80

6
1

0.5 [12.7]

2/Scroll

83

Louvered

Rifled

0.375 [9.5]

16.56 [1.54]
2 / 22 [9]

19,000 [5.6]

Louvered

Rifled

0.375 [9.5]

6.5 [0.6]

4 / 12 [5]

Capillary Tubes

1/1 [25.4]

Propeller

1/24 [609.6]

Direct/1

4000 [1888]

1 at 1/3 HP

1075

FC Centrifugal

1/11x12 [279.4x304.8]

Belt/Variable

1
1 1/2
1725

56

Disposable

Yes

(4)2x16x16 [51x406x406]

88/88 [2495/2495]

615 [279]

11.5

NOTES:

1. Cooling Performance is rated 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 is net and includes the effect of fan motor heat. Units are suitable
for operation to

20% of nominal cfm. Units are certified in accordance with the Unitary Air Conditioner Equipment

certification program, which is based on ARI Standard 210/240 or 360.

2. EER and/or SEER are rated at ARI conditions and in accordance with DOE test procedures.

3. Integrated Part Load Value is rated in accordance with ARI Standard 210/240 or 360. Units are rated at 80° F ambient,
80° F entering dry bulb, and 67° F entering wet bulb at ARI rated cfm.

4. Heating Performance limit settings and rating data were established and approved under laboratory test conditions
using American National Standard Institute standards. Ratings shown are for elevations up to 2000 feet. For elevations
above 2000 feet, ratings

should be reduced at the rate of 4% for each 1000 feet above sea level.

5. Outdoor Sound Rating shown is tested in accordance with ARI Standard 270.

24 IM 861

Miscellaneous

ELECTRICAL DATA

Minimum Circuit Ampacity

Minimum Overcurrent

Protection Device Size

34/34

40/40

Maximum Overcurrent
Protection Device Size

40/40

Compressor Motor

No.

2

Volts

200/230

Phase

3

HP

3

RPM

3450

Amps (RLA)

11.4/11.4

Amps (LRA)

Unit Information

Unit Operating
Voltage Range

77/77

187-253

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)

28.8 28.8

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

200/230

2

40/40

40/40

34/34

187-253

28.8

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

200/230

2

40/40

40/40

34/34

187-253

28.8

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

200/230

2

40/40

40/40

34/34

187-253

14.4

2.8

1 1/2

3

460

1

2.4

1

1/3

1

460

1

39

5.9

3450

3

3

460

2

20

20

18

414-506

14.4

2.8

1 1/2

3

460

1

2.4

1

1/3

1

460

1

39

5.9

3450

3

3

460

2

20

20

18

414-506

14.4

2.8

1 1/2

3

460

1

2.4

1

1/3

1

460

1

39

5.9

3450

3

3

460

2

20

20

18

414-506

14.4

2.8

1 1/2

3

460

1

2.4

1

1/3

1

460

1

39

5.9

3450

3

3

460

2

20

20

18

414-506

Model MPS-

006AGCL10E 006AGCL13E 006AGCM10E 006AGCM13E 006AGDL10E 006AGDL13E 006AGDM10E 006AGDM13E

1. Horsepower Per Compressor.

2. Amp Draw Per Motor. Multiply Value By Number of Motors to Determine Total Amps.

ELECTRICAL DATA

Minimum Circuit Ampacity

Minimum Overcurrent
Protection Device Size

14

15

Maximum Overcurrent
Protection Device Size

15

Compressor Motor

No.

2

Volts

575

Phase

3

HP

3

RPM

3450

Amps (RLA)

4.7

Amps (LRA)

Unit Information

Unit Operating
Voltage Range

31

518-632

Condenser Motor

No.

1

Volts

575

Phase

1

HP

1/3

Amps (FLA)

0.9

Amps (LRA)

1.5

Evaporator Fan

No.

1

Volts

575

Phase

3

HP

1 1/2

Amps (FLA)

2.3

Amps (LRA)

13 13

2.3

1 1/2

3

575

1

1.5

0.9

1/3

1

575

1

31

4.7

3450

3

3

575

2

15

15

14

518-632

Model MPS-

006AGYL13E 006AGYM13E

1. Horsepower Per Compressor.

2. Amp Draw Per Motor. Multiply Value By Number of Motors to Determine Total Amps.

IM 861

25

Figure 19: Cooling 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

• Failed 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 • Loose connection • Check for correct voltage at compressor -

doesn’t 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.

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

Circulating air blower & inducer • Manual reset overtemperature control • Reset or replace

run continuously, tripped

compressor will not start • Wire loose in limit circuit • Check wiring

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

!

26 IM 861

SET THERMOSTAT TO

CALL FOR HEAT

SET FAN SWITCH TO AUTO

START

FLOW CHART CONTINUED ON NEXT PAGE

NO

YES

YES

YES

YES

NO

NO

NO

!

INDUCED DRAFT BLOWER

MOTOR STARTS

15 SECOND PREPURGE

REPLACE INTEGRATED
CONTROL BOARD (IFC)

REPLACE INDUCED

DRAFT BLOWER

NO

REPLACE NEGATIVE

PRESSURE SWITCH

REPLACE INTEGRATED
CONTROL BOARD (IFC)

IF WIRING IS OK

CHECK FOR EXHAUST,

INTAKE OR HEAT

EXCHANGER BLOCKAGE

AND RESET CONTROL

NO

REPLACE IGNITION

CONTROL

YES

REPLACE VALVE

• CHECK LINE VOLTAGE TO CONTROL BOARD

• CHECK LOW VOLTAGE TRANSFORMER

• CHECK WIRING

• CHECK FOR 208-230 VAC TO IOM MOTOR

• CHECK IGNITOR CABLE

• CHECK SPARK IGNITOR POSITION AND CONDITION

• IS NEGATIVE PRESSURE SWITCH CLOSED?

• CHECK FOR OPEN ROLL-OUT CONTROL

• CHECK FOR OPEN LIMIT

• CHECK IGNITION CONTROL CHASSIS GROUND WIRE

• CHECK WIRING

• CHECK INLET GAS PRESSURE

• CHECK 24 VOLTS TO GAS VALVE

• CHECK FOR GAS FLOW TO AND FROM VALVE

• CHECK BURNER CARRYOVER

NOTE: THE SYSTEM WILL ATTEMPT TO LIGHT 3 TIMES WITH A 60 SECOND INTER-

PURGE BETWEEN TRIES. IF AFTER THE THIRD TIME THE BURNERS
DO NOT LIGHT, THE SYSTEM WILL LOCK OUT. IF THE UNIT IS EQUIPPED WITH A
UNITED TECH. OR JOHNSON CONTROLS IGNITION CONTROL,THE SYSTEM
WILL ATTEMPT TO LIGHT 3 TIMES EACH HOUR UNTIL THE BURNERS LIGHT OR
THE THERMOSTAT IS RESET.

YES

YES

IGNITOR SPARKS

MAIN BURNER LIGHTS

NO

• CHECK NEGATIVE PRESSURE
SWITCH SENSING TUBE

• CHECK FOR EXHAUST
BLOCKAGE

YES

YES

YES

REPLACE IGNITOR/
CABLE ASSEMBLY

REPLACE LIMIT
IF UNIT IS COLD

NO

Figure 20: Furnace Troubleshooting Guide (Combination Heating and Cooling Units With Direct Spark Ignition)

!

WARNING

DISCONNECT POWER BEFORE
SERVICING.
SERVICE MUST BE BY A TRAINED,
QUALIFIED SERVICE TECHNICIAN.

HAZARDOUS VOLTAGE

LINE VOLTAGE

CONNECTIONS

IM 861

27

NOTE: IF THE SYSTEM GOES INTO LOCKOUT, WAIT

30 SECONDS AND RESET THE SYSTEM.

• CHECK FLAME SENSOR POSITION AND CONDITION

• CLEAN FLAME SENSOR WITH STEEL WOOL

• CHECK FLAME SENSOR WIRES AND CONNECTIONS

• CHECK FOR 208-230 VAC ACROSS BLOWER
MOTOR TERMINALS ON CONTROL BOARD

• CHECK CAPACITOR

YES

YES

NO

MAIN BURNER FLAME SUSTAINED

YES

NO

INDOOR BLOWER MOTOR STARTS

AFTER 30 SECONDS

REPLACE SENSOR

NO

REPLACE INTEGRATED
CONTROL BOARD (IFC)

NO

REPLACE INTEGRATED
CONTROL BOARD (IFC)

NO

REPLACE IGNITION

CONTROL

YES

YES

REPLACE BLOWER

MOTOR

• CHECK FOR OPEN LIMIT

• CHECK FOR OPEN ROLL-OUT CONTROL

• CHECK FOR PROPER THERMOSTAT OPERATION

• REMOVE VALVE LEAD AT GAS VALVE
IF VALVE CLOSES, RECHECK THE THERMOSTAT
AND WIRING. IF OK,THEN REPLACE VALVE

• CHECK FOR OPEN LIMIT OR ROLL-OUT CONTROL

YES

NO

SYSTEM RUNS UNTIL

CALL FOR HEAT ENDS

• CHECK FOR EXHAUST OR INTAKE BLOCKAGE.
CLEAR BLOCKAGE AND RESET CONTROL

• CHECK FOR DIRTY FILTERS

• CHECK FOR RESTRICTED AIRFLOW

TROUBLESHOOTING ENDS

REPEAT PROCEDURE UNTIL TROUBLE FREE

OPERATION IS OBTAINED.

YES

NO

TURN THERMOSTAT OFF

VALVE SHUTS OFF

FLAME SHUTS OFF

YES

NO

INDUCED DRAFT MOTOR STOPS

AFTER 5 SECOND POSTPURGE

YES

YES

• CHECK FOR DIRTY FILTERS

• CHECK FOR RESTRICTED
AIR-FLOW

CHECK FOR EXHAUST,

INTAKE OR HEAT

EXCHANGER BLOCKAGE

CLEAR BLOCKAGE AND

RESET CONTROL

YES

NO

INDOOR BLOWER MOTOR STOPS

AFTER 90 SECONDS

28 IM 861

Figure 21

ELECTRICAL WIRING DIAGRAM

208 / 230, 3 PHASE, 60 HZ

DUAL CIRCUIT

BELT DRIVE

IM 861

29

Figure 22

ELECTRICAL WIRING DIAGRAM

575, 3 PHASE, 60 HZ

BELT DRIVE

DUAL CIRCUIT

30 IM 861

6 TON COOLING - CIRCUIT 1

Figure 23: System Charge Charts

SYSTEM CHARGE CHART – REFRIGERANT 22

6 TON, CIRCUIT 1

IM 861

31

6 TON COOLING - CIRCUIT 2

Figure 24: System Charge Charts

SYSTEM CHARGE CHART – REFRIGERANT 22

6 TON, CIRCUIT 2

32 IM 861

© 2007 McQuay International • www.mcquay.com • 800-432-1342

McQuay Training and Development

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

Warranty

All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product
Warranty. Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your
local McQuay Representative, go to www.mcquay.com.

This document contains the most current product information as of this printing. For the most up-to-date product
information, please go to www.mcquay.com.