McQuay MPS003AG Installation Manual

© 2007 McQuay International

Maverick I™
Commercial Packaged Rooftop System
Heating & Cooling

Gas/Electric
Models MPS003AG – 005AG
3 to 5 Tons

Installat

ion and Ma

intenance Manual

IM 860

Group: Applied Systems

Part Number: 92-102421-02-00

Date: March 2007

ARI Standard
210/240 UAC

™

2 IM 860

Table of Contents

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

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

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

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

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

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

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Unit Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pre-Installation Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Outside Slab Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Attaching Exhaust and Combustion Air Inlet Hoods. . . . . . . . . . . 7

Cover Panel Installation/Conversion Procedure. . . . . . . . . . . . . . 7

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Rooftop Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Return Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Gas Supply, Condensate Drain and Piping . . . . . . . 10

Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

LP Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

NOx Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Adjusting or Checking Furnace Input . . . . . . . . . . . . . . . . . . . . . 11

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Hook Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Furnace Section Controls and Ignition System . . . 14

Normal Furnace Operating Sequence . . . . . . . . . . . . . . . . . . . . 14

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Burners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Manual Reset Overtemperature Control . . . . . . . . . . . . . . . . . . 15

Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

System Operating Information . . . . . . . . . . . . . . . . . 16

Advise The Customer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Furnace Section Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cooling Section Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Blower Motor Speed Taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23

Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Airflow Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-28

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-32

Charge Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-35

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-38

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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 80,000, 100,000, 120,000 and 135,000 BTU/Hr.
heating inputs and cooling capacities of 3, 4, and 5 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 information on the rating plate is in compliance with the
FTC and DOE rating for single phase units. 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 effi-

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

Major Components

The unit includes a hermetically-sealed refrigerating system
(consisting of a scroll compressor, 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.

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 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.

IM 860

3

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.

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.

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

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

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.

Never test for gas leaks with an open flame. It can cause an
explosion or fire resulting in property damage, personal
injury or death. Use a commercially available soap solution
made specifically for the detection of leaks to check all con­nections, as specified in the Gas Supply and Piping section
of these instructions.

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.

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DANGER

!

!

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WARNING

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WARNING

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WARNING

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DANGER

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WARNING

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4

Figure 1: Bottom View

Figure 2: Cabinet Dimensions and Access Locations

Unit Dimensions

FOR CLEARANCES
SEE FIGURE 7.

IMPORTANT: THIS
UNIT MUST BE
MOUNTED LEVEL
IN BOTH DIREC­TIONS TO ALLOW
WATER TO DRAIN
FROM THE CON­DENSER SECTION
AND CONDEN­SATE PAN.

I316

I281

IM 860

2

9.56

44.125

48.125

4.5

2.25

SUPPLY AIR

RETURN AIR

2

3.25

4.5

20

20

13.125

13.125

14.44

2

31.19

3.81

78.25

24.03

48.06

5.34

BLOWER

ACCESS

COIL/FILTER

ACCESS

SUPPLY COVER

RETURN COVER

4.625

5

Figure 3: Cabinet Dimensions and Access Locations

Figure 4: Supply and Return Dimensions – Back View

I282

I288

IM 860

48.5

24.25

7.22

75.53

11.125

12.25

12.25

35

6.84

4.94

13.72

76.25

5.5

19.125

19.125

35

18

9.19

6 IM 860

Installation

General

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

1 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

2 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.

If the unit is to be installed in an area where contami­nants are likely to be a problem, give special attention
to the equipment location and exposure.

1 Avoid having lawn sprinkler heads spray directly on

the unit cabinet.

2 In coastal areas locate the unit on the side of the build-

ing away from the waterfront.

3 Shielding by a fence or shrubs may give some protec-

tion.

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 Slab 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.

4 Locate unit where operating sounds will not disturb

owner or neighbors.

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.

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.

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.

Power supply to unit must be disconnected before making
field connections. To avoid electrical shock, personal injury
or death, be sure to rigorously adhere to field wiring proce­dures regarding proper lockout and tagout of components.

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WARNING

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DANGER

!

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WARNING

!

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DANGER

!

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.

8 Remove compressor shipping supports (if so equipped)

after installation.

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.

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 open-

ings 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.

This unit is provided with 2 - 25” X 16” X 1” 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, provided 1 inch minimum Fiberglass insu­lation is applied either inside or on the outside of the duct.

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 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.

IM 860

7

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

I631

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

I298

8 IM 860

4 Remove compressor shipping supports (if so equipped)

after installation.

IMPORTANT: If unit will not be put into service immediately,
block off supply and return air openings to prevent excessive
condensation.

Ductwork

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 user be informed against
future changes in construction which might change this to a “con­fined space.” Also, caution the user/homeowner against any
future installation of additional equipment (such as power ventila­tors, clothes dryers, etc., 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 7: Clearances

I297

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.

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DANGER

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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.

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

I299

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DANGER

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IM 860

9

N

A

*

E

T

D

Figure 11: Roofcurb

Figure 10: Roofcurb

RETURN DUCT*

SUPPLY DUCT*

NAILING STRIP

INSULATION PANELS
(2) SUPPLIED

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

HOLD
DOWN
BRACKET
TYP. (4) PLCS.

UNIT

I296

ST-A0801-19-01

CORNER WEIGHTS BY PERCENTAGE

AB C D

22% 27% 23%28%

SPREADER BAR

A

B

D

C

LIFTING BEAM

CABLE OR CHAIN

.625ⴖ SHACKLE

(EACH CORNER)

38.25

25.75

C.G.

ST-A0801-19-01

ROOFTOP UNIT

COUNTER FLASHING*

INSULATION*

CANT STRIP*

ROOF FELT*

INSULATION*

ROOF DECK*

*BY CONTRACTOR

ROOF
STRUCTURAL
MEMBER*

ROOFCURB

DUCT*

NAILER STRIP

GASKET

RETURN

SUPPLY

Figure 9: Rigging Detail

GASKET

NAILER STRIP

DUCT*

ROOFCURB

TURAL

ER*

ROOFTOP U

COUNTER FL

INSULATION

CANT STRIP*

ROOF F

INSULA

ROOF

10

Gas Supply, Condensate Drain
and Piping

Gas Connection

IMPORTANT: Connect this unit only to gas supplied by a com-

mercial utility.

1 Install gas piping in accordance with local codes and reg-

ulations 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 provid-

ed 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 pre-

vent 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.)

NOTE: The Commonwealth of Massachusetts requires the gas
shut-off valve to be a T-handle gas lock.

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.

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 1.

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

IM 860

Never test for gas leaks with an open flame. It can cause an
explosion or fire resulting in property damage, personal
injury or death. Use a commercially available soap solution
made specifically for the detection of leaks to check all con­nections, as specified in the Gas Supply and Piping section
of these instructions.

Figure 12: Suggested Gas Piping

FROM GAS
METER

*

Factory supplied grommet must be utilized.

MANUAL GAS
SHUT-OFF
VALVE

UNIT GAS SUPPLY
CONNECTION

*

ROOF OR GROUND LEVEL INSTALLATION

Table 1: Gas Pipe Capacity Table (Cu. Ft./Hr.)

Nominal

Iron Pipe

Size,

Inches

Equivalent Length of Pipe, Feet

10 20 30 40 506070 80

1

⁄2 1329273 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

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

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DANGER

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11

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.

NOx Models

When converting units equipped with NOx inserts to LP gas,
the stainless steel screen mesh inserts in the entrance of the
tubular exchangers are not required to meet SCAQMD NOx
emission levels. These inserts and 1/8ⴖ diameter retaining rod
should be carefully removed before firing this furnace on LP
gas. IMPORTANT: This furnace is not designed to operate on

LP gas with the NOx inserts in place.

Step by step instructions on removing the NOx inserts and
retaining rod are included in the Conversion Kit Installation
Instructions.

Adjusting or Checking Furnace Input

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

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

Supply and manifold pressure taps are located on the gas valve
body 1/8” 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 10” 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 reg-

ulator 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.

IM 860

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

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)

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.

Figure 13

Figure 14

MANIFOLD PIPE

12

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

nace 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 dis-

connect), the minimum wire size for the length of run can
be determined from Table 3 using the circuit ampacity
found on the unit rating plate. Use the smallest wire size
allowable in Table 4 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.

IM 860

Table 3

ONE 1 21 1 30134139 3 45

40,000

TEN 133015 015 361630 37 30

ONE 0541 01 3 16230

60,000

TEN 9 0 10 0 10 24 11 0 25 0

ONE 041045047050153

80,000

TEN 6 45 7 30748815 18 45

ONE 0 33 0 36038 040 130

100,000

TEN 5246 061563615 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.

Figure 15: Condensate Drain

DO NOT OVERTIGHTEN DRAIN FITTING

Power supply to unit must be disconnected before making
field connections. To avoid electrical shock, personal injury
or death, be sure to rigorously adhere to field wiring proce­dures regarding proper lockout and tagout of components.

Figure 16: Recommended Branch Circuit Disconnect
Location

TO POWER

TO THERMOSTAT

BRANCH
CIRCUIT
DISCONNECT

I317A

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DANGER

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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 CON-

TACTOR.

WARRANTY MAY BE JEOPARDIZED IF ALUMINUM WIRE IS
CONNECTED TO UNIT CONTACTOR.

Special instructions apply for power wiring with aluminum
conductors: Warranty is void if connections are not made
per instructions.

Attach a length (6” or more) of recommended size copper wire
to the unit contactor terminals L1 and L3 for single phase, L1,
L2 and L3 for three phase.

Select the equivalent aluminum wire size from the tabulation
below:

Splice copper wire pigtails to aluminum wire with U.L. recog­nized connectors for copper-aluminum splices. Please exercise
the following instructions very carefully to obtain a positive
and lasting connection:

1 Strip insulation from aluminum conductor.

2 Coat the stripped end of the aluminum wire with the rec-

ommended inhibitor, and wire brush the aluminum sur­face through inhibitor. INHIBITORS: Brundy-Pentex
“A”; Alcoa-No. 2EJC; T & B-KPOR Shield.

3 Clean and recoat aluminum conductor with inhibitor.

4 Make the splice using the above listed wire nuts or split

bolt connectors.

5 Coat the entire connection with inhibitor and wrap with

electrical insulating tape.

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.

13IM 860

200 6 4 4 4 3322

150 8 6644433

100 10 8866644

50 14 12 10 10 8866

15 20 25 30 35404550

BRANCH CIRCUIT AMPACITY

SUPPLY WIRE
LENGTH-FEET

*Taken from National Electric Code

Table 4: Branch Circuit Copper Wire Size
(Based on 1% Voltage Drop)*

Table 5

AWG Copper AWG Aluminum Connector Type and Size

Wire Size Wire Size (or equivalent)

#12 #10 T & B Wire Nut PT2
#10 # 8 T & B Wire Nut PT3
# 8 #6 Sherman Split Bolt TSP6
#6 #4 Sherman Split Bolt TSP4
#4 #2 Sherman Split Bolt TSP2

Figure 17

I658

Figure 18: Typical Thermostat Wiring

WIRE SIZE, AWG

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

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).

14

Internal Wiring

IMPORTANT: Some single phase units are equipped with a sin-

gle pole contactor. Caution must be exercised when servicing as
only one leg of the power supply is broken with the contactor.

Some models are equipped with electronically commutated
blower motors which are constantly energized, unless the main
unit disconnect is in the off position.

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.

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

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.

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 sec-

onds.

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.

IM 860

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.

15

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 building.

• 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 “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.

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 (one on 80,000
BTUH) 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.

IM 860

Never test for gas leaks with an open flame. It can cause an
explosion or fire resulting in property damage, personal
injury or death. Use a commercially available soap solution
made specifically for the detection of leaks to check all con­nections, as specified in the Gas Supply and Piping section
of these instructions.

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

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.

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!

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

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▲▲

DANGER

!

▲▲

DANGER

!

▲▲

DANGER

!

▲▲

DANGER

!

16

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 oper-

ates 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 blow-

er 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.

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.

IM 860

Never test for gas leaks with an open flame. It can cause an
explosion or fire resulting in property damage, personal
injury or death. Use a commercially available soap solution
made specifically for the detection of leaks to check all con­nections, as specified in the Gas Supply and Piping section
of these instructions.

Holes in the exhaust transition or heat exchanger can cause
toxic fumes to enter the building. 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.

Power supply to unit must be disconnected before making
field connections. To avoid electrical shock, personal injury
or death, be sure to rigorously adhere to field wiring proce­dures regarding proper lockout and tagout of components.

Power supply to unit must be disconnected before making
field connections. To avoid electrical shock, personal injury
or death, be sure to rigorously adhere to field wiring proce­dures regarding proper lockout and tagout of components.

▲▲

DANGER

!

▲▲

DANGER

!

▲▲

DANGER

!

▲▲

DANGER

!

17

Lubrication

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.

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 obstruc-

tion 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 it
as 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 pan-

els.

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 Troubleshooting Chart included in this manual.

Wiring Diagrams

Refer to the appropriate wiring diagram included in this manu­al.

Charging

Refer to the appropriate charge chart included in this manual.

IM 860

Power supply to unit must be disconnected before making
field connections. To avoid electrical shock, personal injury
or death, be sure to rigorously adhere to field wiring proce­dures regarding proper lockout and tagout of components.

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

!

▲▲

DANGER

!

18

Blower Motor Speed Taps

After determining necessary CFM and speed tap data from the
Airflow Performance Data, follow the steps below to change
speeds.

1 Remove the blower access panel.

2 Reference Figure 19 for location of the speed tap block

on the blower.

3 Remove the furnace control access panel.

4 Remove the control box cover. See Figure 20 for location

of the integrated furnace control board.

5 Reference Figure 21 for the proper location of the red and

black wires on the speed tap block and on the furnace
integrated control board to obtain the speed tap you have
chosen.

6 After adjusting the wires accordingly, attach the control

box cover, furnace control access panel and the blower
access panel to the unit.

IM 860

Figure 19

Figure 20

INTEGRATED FURNACE
CONTROL

SPEED TAP BLOCK

FIGURE 21

19IM 860

Figure 21 (Continued)

20

General Data

Nominal Sizes 3-5 Tons [10.6-17.6 kW] ASHRAE 90.1-2004 Compliant Models

IM 860

Model MPS- 003AGCK08E 003AGCK12E 003AGDK08E 003AGDK12E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 37,400 [10.96] 37,400 [10.96] 37,400 [10.96] 37,400 [10.96]
EER/SEER

2

11.7/13 11.7/13 11.7/13 11.7/13
Nominal CFM/ARI Rated CFM [L/s] 1200/1200 [566/566] 1200/1200 [566/566] 1200/1200 [566/566] 1200/1200 [566/566]
ARI Net Cooling Capacity Btu [kW] 36,000 [10.55] 36,000 [10.55] 36,000 [10.55] 36,000 [10.55]
Net Sensible Capacity Btu [kW] 26,400 [7.74] 26,400 [7.74] 26,400 [7.74] 26,400 [7.74]

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] 80,000 [23.44] 120,000 [35.16] 80,000 [23.44] 120,000 [35.16]
Heating Output Btu [kW] 64,800 [18.99] 97,200 [28.48] 64,800 [18.99] 97,200 [28.48]
Temperature Rise Range ˚F [˚C] 30-60 [16.7/33.3] 50-80 [27.8/44.4] 30-60 [16.7/33.3] 50-80 [27.8/44.4]

Net Weight lbs. [kg] 543 [246] 543 [246] 543 [246] 543 [246]

Steady State Efficiency (%) 81 81 81 81

AFUE % 80 80 80 80

No. Burners 4 6 4 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

78 78 78 78

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] 16.91 [1.57] 16.91 [1.57] 16.91 [1.57] 16.91 [1.57]
Rows / FPI [FPcm] 1 / 22 [9] 1 / 22 [9] 1 / 22 [9] 1 / 22 [9]

Net Latent Capacity Btu [kW] 9,600 [2.81] 9,600 [2.81] 9,600 [2.81] 9,600 [2.81]

Indoor Coil—Fin Type Corrugated Corrugated Corrugated Corrugated

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] 5.17 [0.48] 5.17 [0.48] 5.17 [0.48] 5.17 [0.48]
Rows / FPI [FPcm] 2 / 17 [7] 2 / 17 [7] 2 / 17 [7] 2 / 17 [7]
Refrigerant Control TX Valves TX Valves TX Valves TX Valves
Drain Connection No./Size in. [mm] 1/0.75 [19.05] 1/0.75 [19.05] 1/0.75 [19.05] 1/0.75 [19.05]

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] 3680 [1737] 3680 [1737] 3680 [1737] 3680 [1737]
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] 1/10x10 [254x254] 1/10x10 [254x254] 1/10x10 [254x254] 1/10x10 [254x254]
Drive Type/No. Speeds Direct/3 Direct/3 Direct/3 Direct/3
No. Motors 1 1 1 1
Motor HP 1/2 1/2 1/2 1/2
Motor RPM 1075 1075 1075 1075
Motor Frame Size 48 48 48 48

Filter—Type Disposable Disposable Disposable Disposable

Furnished Yes Yes Yes Yes
(No.) Size Recommended in. [mm] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635]

(1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635]

Weights

Ship Weight lbs. [kg] 550 [249] 550 [249] 550 [249] 550 [249]

Net System Power kW 3.08 3.08 3.08 3.08

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 93 [2637] 93 [2637] 93 [2637] 93 [2637]

CONTINUED

[] Designates Metric Conversions

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 r

ated 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.

21

General Data

Nominal Sizes 3-5 Tons [10.6-17.6 kW] ASHRAE 90.1-2004 Compliant Models

IM 860

Model MPS- 004AGCK10E 004AGCK13E 004AGDK10E 004AGDK13E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 49,000 [14.36] 49,000 [14.36] 49,000 [14.36] 49,000 [14.36]
EER/SEER

2

11.4/13.1 11.4/13.1 11.4/13.1 11.4/13.1
Nominal CFM/ARI Rated CFM [L/s] 1600/1550 [755/731] 1600/1550 [755/731] 1600/1550 [755/731] 1600/1550 [755/731]
ARI Net Cooling Capacity Btu [kW] 47,000 [13.77] 47,000 [13.77] 47,000 [13.77] 47,000 [13.77]
Net Sensible Capacity Btu [kW] 33,600 [9.84] 33,600 [9.84] 33,600 [9.84] 33,600 [9.84]

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] 100,000 [29.3] 135,000 [39.56] 100,000 [29.3] 135,000 [39.56]
Heating Output Btu [kW] 81,000 [23.73] 109,400 [32.05] 81,000 [23.73] 109,400 [32.05]
Temperature Rise Range ˚F [˚C] 40-70 [22.2/38.9] 50-80 [27.8/44.4] 30-60 [16.7/33.3] 50-80 [27.8/44.4]

Net Weight lbs. [kg] 580 [263] 585 [265] 580 [263] 585 [265]

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

78 78 78 78

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] 13,400 [3.93] 13,400 [3.93] 13,400 [3.93] 13,400 [3.93]

Indoor Coil—Fin Type Corrugated Corrugated Corrugated Corrugated

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] 5.17 [0.48] 5.17 [0.48] 5.17 [0.48] 5.17 [0.48]
Rows / FPI [FPcm] 3 / 15 [6] 3 / 15 [6] 3 / 15 [6] 3 / 15 [6]
Refrigerant Control TX Valves TX Valves TX Valves TX Valves
Drain Connection No./Size in. [mm] 1/0.75 [19.05] 1/0.75 [19.05] 1/0.75 [19.05] 1/0.75 [19.05]

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] 3680 [1737] 3680 [1737] 3680 [1737] 3680 [1737]
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] 1/10x10 [254x254] 1/10x10 [254x254] 1/10x10 [254x254] 1/10x10 [254x254]
Drive Type/No. Speeds Direct/3 Direct/3 Direct/3 Direct/3
No. Motors 1 1 1 1
Motor HP 1/2 1/2 1/2 1/2
Motor RPM 1075 1075 1075 1075
Motor Frame Size 48 48 48 48

Filter—Type Disposable Disposable Disposable Disposable

Furnished Yes Yes Yes Yes
(No.) Size Recommended in. [mm] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635]

(1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635]

Weights

Ship Weight lbs. [kg] 587 [266] 592 [269] 587 [266] 592 [269]

Net System Power kW 4.15 4.15 4.15 4.15

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 167 [4734] 167 [4734] 167 [4734] 167 [4734]

CONTINUED

[] Designates Metric Conversions

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 r

ated 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 860

General Data

Nominal Sizes 3-5 Tons [10.6-17.6 kW] ASHRAE 90.1-2004 Compliant Models

Model MPS- 005AGCM10E 005AGCM13E 005AGDM10E 005AGDM13E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 60,000 [17.58] 60,000 [17.58] 60,000 [17.58] 60,000 [17.58]
EER/SEER

2

11.6/13 11.6/13 11.6/13 11.6/13
Nominal CFM/ARI Rated CFM [L/s] 2000/1900 [897/897] 2000/1900 [897/897] 2000/1900 [897/897] 2000/1900 [897/897]
ARI Net Cooling Capacity Btu [kW] 58,000 [16.99] 58,000 [16.99] 58,000 [16.99] 58,000 [16.99]
Net Sensible Capacity Btu [kW] 42,000 [12.31] 42,000 [12.31] 42,000 [12.31] 42,000 [12.31]

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] 100,000 [29.3] 135,000 [39.56] 100,000 [29.3] 135,000 [39.56]
Heating Output Btu [kW] 81,000 [23.73] 109,400 [32.05] 81,000 [23.73] 109,400 [32.05]
Temperature Rise Range ˚F [˚C] 25-55 [13.9/30.6] 40-70 [22.2/38.9] 25-55 [13.9/30.6] 40-70 [22.2/38.9]

Net Weight lbs. [kg] 590 [268] 590 [268] 590 [268] 590 [268]

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] 16,000 [4.69] 16,000 [4.69] 16,000 [4.69] 16,000 [4.69]

Indoor Coil—Fin Type Corrugated Corrugated Corrugated Corrugated

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] 5.17 [0.48] 5.17 [0.48] 5.17 [0.48] 5.17 [0.48]
Rows / FPI [FPcm] 3 / 15 [6] 3 / 15 [6] 3 / 15 [6] 3 / 15 [6]
Refrigerant Control TX Valves TX Valves TX Valves TX Valves
Drain Connection No./Size in. [mm] 1/0.75 [19.05] 1/0.75 [19.05] 1/0.75 [19.05] 1/0.75 [19.05]

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] 3930 [1855] 3930 [1855] 3930 [1855] 3930 [1855]
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] 1/10x10 [254x254] 1/10x10 [254x254] 1/10x10 [254x254] 1/10x10 [254x254]
Drive Type/No. Speeds Belt/Variable Belt/Variable Belt/Variable Belt/Variable
No. Motors 1 1 1 1
Motor HP 1 1 1 1
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] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635]

(1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635] (1)1x16x25 [25x406x635]

Weights

Ship Weight lbs. [kg] 597 [271] 597 [271] 597 [271] 597 [271]

Net System Power kW 5 5 5 5

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 160 [4536] 160 [4536] 160 [4536] 160 [4536]

[] Designates Metric Conversions

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 r

ated 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.

23

General Data

Nominal Sizes 3-5 Tons [10.6-17.6 kW] ASHRAE 90.1-2004 Compliant Models

IM 860

[] 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 r

ated 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

Miscellaneous

IM 860

ELECTRICAL DATA

Minimum Circuit Ampacity 18/18

Unit Information

Unit Operating
Voltage Range

187-253

Minimum Overcurrent
Protection Device Size

20/20

Maximum Overcurrent
Protection Device Size

25/25

Compressor Motor

No. 1

Volts 200/230

Phase 3

HP 3

RPM 3450
Amps (RLA) 9.6/9.6
Amps (LRA) 88/88

Condenser Motor

No. 1

Volts 208/230

Phase 1

HP 1/3

Amps (FLA) 1.5

Amps (LRA) 3

Evaporator Fan

No. 1

Volts 208/230

Phase 1

HP 1/2

Amps (FLA) 4

Amps (LRA) 6.7 6.7

4

1/2

1

208/230

1

3

1.5

1/3

1

208/230

1

88/88

9.6/9.6

3450

3

3

200/230

1

25/25

20/20

18/18

187-253

3.6

2

1/2

1

460

1

1.9

1

1/3

1

460

1

38

5.8

3450

3

3

460

1

15

15

11

414-506

3.6

2

1/2

1

460

1

1.9

1

1/3

1

460

1

38

5.8

3450

3

3

460

1

15

15

11

414-506

6.7

4

1/2

1

208/230

1

3

1.5

1/3

1

208/230

1

80.8/80.8

12.2/12.2

3450

4

3

200/230

1

30/30

25/25

21/21

187-253

6.7

4

1/2

1

208/230

1

3

1.5

1/3

1

208/230

1

80.8/80.8

12.2/12.2

3450

4

3

200/230

1

30/30

25/25

21/21

187-253

3.6

2

1/2

1

460

1

1.9

1

1/3

1

460

1

41

6.1

3450

4

3

460

1

15

15

11

414-506

3.6

2

1/2

1

460

1

1.9

1

1/3

1

460

1

41

6.1

3450

4

3

460

1

15

15

11

414-506

Model MPS-

003AGCK08E 003AGCK12E 003AGDK08E 003AGDK12E 004AGCK10E 004AGCK13E 004AGDK10E 004AGDK13E

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

Maximum Overcurrent
Protection Device Size

Compressor Motor

No.

Volts

Phase

HP

RPM
Amps (RLA)
Amps (LRA)

Unit Information

Unit Operating
Voltage Range

Condenser Motor

No.

Volts

Phase

HP
Amps (FLA)
Amps (LRA)

Evaporator Fan

No.

Volts

Phase

HP
Amps (FLA)
Amps (LRA)

24

3.8

1

3

208/230

1

4.9

2.2

1/3

1

208/230

1

110/110

15.4/15.4

3450

5

3

200/230

1

40/40

30/30

26/26

187-253

24

3.8

1

3

208/230

1

4.9

2.2

1/3

1

208/230

1

110/110

15.4/15.4

3450

5

3

200/230

1

40/40

30/30

26/26

187-253

12

1.9

1

3

460

1

1.9

1

1/3

1

460

1

52

7.1

3450

5

3

460

1

15

15

12

414-506

12

1.9

1

3

460

1

1.9

1

1/3

1

460

1

52

7.1

3450

5

3

460

1

15

15

12

414-506

Model MPS-

005AGCM10E 005AGCM13E 005AGDM10E 005AGDM13E

1. Horsepower Per Compressor.

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

25

0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80

CFM 1210 1193 1175 1155 1125 1075 1015 925

Watts 450 400 395 385 380 375 370 360

CFM 1515 1500 1475 1450 1405 1350 1275 1180

Watts 525 515 510 505 490 475 460 445

CFM 1680 1650 1625 15801530 1460 1390 1280

Watts 650 640 630 610 580 560 545 515

CFM 1210 1193 1175 1155 1125 1075 1015 925

Watts 450 400 395 385 380 375 370 360

CFM 1515 1500 1475 1450 1405 1350 1275 1180

Watts 525 515 510 505 490 475 460 445

CFM 1680 1650 1625 15801530 1460 1390 1280

Watts 650 640 630 610 580 560 545 515

DIRECT-DRIVE BLOWER 208 AIRFLOW PERFORMANCE

CFM Air Delivery/RPM/Watts-208 VOLTS

External Static Pressure-Inches W.C.

Unit Model

MPS003A/

MPS004A

MPS003A/

MPS004A

Cool

Low

Med

Heat

Low

Med

Motor Speed

From Factory

Heating

Input

BTU/hr

[kW]

80,000

[23.45]

120,000

[35.17]

Manufacturer

Recommended

Air-Flow Range

(Min / Max) CFM

1050 / 1350

Blower Size/

Motor HP #

of Speeds

10x10

1/2

3 Speed

Motor

Speed

Low

Med

High

Low

Med

80,000

[23.45]

120,000

[35.17]

1225 / 1575

10x10

1/2

3 Speed

Low

Med

High

Indoor Airflow Performance For 3-4 Ton Packaged Rooftop System

Direct Drive

IM 860

26

0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80

CFM 1400 1375 1360 13351305 1255 1210 1100

Watts 470 460 455 450 440 435 425 410

CFM 1685 1620 1580 1550 1500 14301350 1230

Watts 635 600 580 570 550 535 505 475

CFM 1870 1830 1790 1730 1660 1580 1500 1375

Watts 780 760 740 700 660 635 600 555

CFM 1400 1375 1360 13351305 1255 1210 1100

Watts 470 460 455 450 440 435 425 410

CFM 1685 1620 1580 1550 1500 14301350 1230

Watts 635 600 580 570 550 535 505 475

CFM 1870 1830 1790 1730 1660 1580 1500 1375

Watts 780 760 740 700 660 635 600 555

DIRECT-DRIVE 230 AIRFLOW PERFORMANCE

CFM Air Delivery/RPM/Watts-230 VOLTS

External Static Pressure-Inches W.C.

Unit Model

MPS003A/

MPS004A

MPS003A/

MPS004A

Cool

Low

Med

Heat

Low

Med

Motor Speed

From Factory

Heating

Input

BTU/hr

[kW]

80,000

[23.45]

120,000

[35.17]

Manufacturer

Recommended

Air-Flow Range

(Min / Max) CFM

1050 / 1350

Blower Size/

Motor HP #

of Speeds

10x10

1/2

3 Speed

Motor

Speed

Low

Med

High

Low

Med

80,000

[23.45]

120,000

[35.17]

1225 / 1575

10x10

1/2

3 Speed

Low

Med

High

Indoor Airflow Performance For 3-4 Ton Packaged Rooftop System

Direct Drive

IM 860

27

0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80

CFM 1400 1375 1360 13351305 1255 1210 1100

Watts 470 460 455 450 440 435 425 410

CFM 1685 1620 1580 1550 1500 14301350 1230

Watts 635 600 580 570 550 535 505 475

CFM 1870 1830 1790 1730 1660 1580 1500 1375

Watts 780 760 740 700 660 635 600 555

CFM 1400 1375 1360 13351305 1255 1210 1100

Watts 470 460 455 450 440 435 425 410

CFM 1685 1620 1580 1550 1500 14301350 1230

Watts 635 600 580 570 550 535 505 475

CFM 1870 1830 1790 1730 1660 1580 1500 1375

Watts 780 760 740 700 660 635 600 555

CFM Air Delivery/RPM/Watts-460 VOLTS

External Static Pressure-Inches W.C.

DIRECT-DRIVE 460 AIRFLOW PERFORMANCE

Unit Model

MPS003A/

MPS004A

MPS003A/

MPS004A

Cool

Low

Med

Heat

Low

Motor Speed

From Factory

Heating

Input

BTU/hr

[kW]

80,000

[23.45]

120,000

[35.17]

Manufacturer

Recommended

Air-Flow Range

(Min / Max) CFM

1050 / 1350

Blower Size/

Motor HP #

of Speeds

10x10

1/2

3 Speed

Motor

Speed

Low

Med

High

Med

80,000

[23.45]

120,000

[35.17]

1225 / 1575

10x10

1/2

3 Speed

Low

Med

High

Indoor Airflow Performance For 3-4 Ton Packaged Rooftop System

Direct Drive

IM 860

28

5 TON - 13 SEER MODELS

RPM WATTS

——

——

——

——

780 455

800 485

830 550

860 615

895 680

940 755

970 825

RPM WATTS

1065 570

1080 615

1105 680

1120 725

1140 785

1160 850

1180 910

1210 995

1240 1055

1265 1125

1300 1210

“M”

RPM WATTS

1340 745

1355 805

1365 880

1375 940

1390 1020

1405 1100

——

——

——

——

——

CAPACITY: 5 TON - 13 SEER

VOLTAGE: 208/230 - 460

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

1400

1500

1600

1700

1800

1900

2000

2100

2200

2300

2400

RPM WATTS

——

——

780 390

795 450

815 470

850 530

880 605

915 655

945 735

975 795

1015 880

“L”

RPM WATTS

815 385

840 415

870 470

895 530

915 560

945 640

970 700

1005 760

1030 830

1065 910

1100 1005

RPM WATTS

875 425

895 440

915 510

940 570

965 615

995 675

1015 730

1040 820

1060 880

1100 965

1145 1055

RPM WATTS

930 460

945 500

965 560

990 605

1010 660

1035 720

1055 790

1090 870

1120 940

1150 1050

1175 1085

RPM WATTS

970 490

995 540

1015 600

1035 640

1055 710

1070 775

1105 830

1130 910

1155 980

1180 1050

1225 1140

RPM WATTS

1030 540

1045 595

1060 640

1075 680

1100 760

1120 810

1145 875

1170 950

1195 1020

1225 1095

1260 1175

RPM WATTS

1105 595

1135 650

1145 705

1160 755

1175 810

1200 890

1225 950

1250 1020

1275 1100

1310 1175

1340 1255

RPM WATTS

1150 615

1165 675

1180730

1200 790

1225 850

1245 915

1260 980

1290 1060

1320 1140

1350 1230

1370 1315

RPM WATTS

1195 645

1215 700

1225 750

1245 815

1260 880

1290 960

1320 1035

1335 1100

1360 1180

1375 1260

1400 1375

RPM WATTS

1235 660

1255 735

1275 790

1300 855

1320 930

1335 1000

1350 1075

1370 1150

1385 1225

1405 1320

——

RPM WATTS

1300 705

1320 775

1340 840

1355 905

1365 985

1375 1050

1385 1120

1400 1200

——

——

——

AIR

FLOW

CFM

DRIVE PACKAGE “L” “M”

MOTOR H.P. 3/4 1

BLOWER SHEAVE 6.4ⴖ PITCH DIAMETER 6.4ⴖ PITCH DIAMETER

MOTOR SHEAVE 2.8ⴖ - 3.8ⴖ PITCH DIAMETER - ADJ. 3.4ⴖ - 4.4ⴖ PITCH DIAMETER - ADJ.

TURNS OPEN 0 1 2 3 4560123 456

RPM 1095 1040 995 940 890 835780 1405 1360 1305 1250 1195 1145 1095

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

780 370

795 405

805 425

840 490

870 540

895 590

930 655

955 705

995 780

1015 830

1040 925

Indoor Airflow Performance For 5 Ton Packaged Rooftop System

Belt Drive

NOTE: Bold lines separate L and M drives respectively.

NOTE: Factory sheave settings are shown in bold print.

IM 860

29

Figure 22: Wiring Diagram For 3 & 4 Ton Packaged Rooftop Systems

IM 860

30

Figure 23: Wiring Diagram For 5 Ton Packaged Rooftop Systems

IM 860

31

Figure 24: Wiring Diagram For 5 Ton Packaged Rooftop Systems

IM 860

32

Figure 25: Wiring Diagram For 3 & 4 Ton Packaged Rooftop Systems

IM 860

33

Figure 26: System Charge Charts

3 TON COOLING - 13 SEER

IM 860

34

Figure 27: System Charge Charts

4 TON COOLING - 13 SEER

IM 860

35

Figure 28: System Charge Charts

5 TON COOLING - 13 SEER

IM 860

36

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 • Run or start capacitor failed (single phase only) • Replace

doesn’t • Start relay defective 9single 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

• Flow check piston size too small • Change to correct size piston

• Incorrect capillary tubes • Change coil assembly

• TXV does not open • Replace TXV

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 • TXV hunting • Check TXV bulb clamp - check air distribution on coil - replace

pressures TXV

• Air or non-condensibles in system • Recover refrigerant, evacuate & recharge

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

IM 860

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

!

37

Furnace Troubleshooting Guide

(Combination Heating and Cooling Units With Direct Spark Ignition)

SET THERMOSTAT TO

CALL FOR HEAT

SET FAN SWITCH TO AUTO

START

HAZARDOUS VOLTAGE

LINE VOLTAGE CON-

NECTIONS

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

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 CON-

TROL

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

IM 860

▲▲

WARNING

!

38 IM 860

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 CON-

TROL

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 EXCHANG-

ER BLOCKAGE

CLEAR BLOCKAGE AND

RESET CONTROL

YES

NO

INDOOR BLOWER MOTOR STOPS

AFTER 90 SECONDS

IM 860

39

40 IM 860

McQuay Training and Development

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

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.