McQuay MPS015AGDL25E Installation Manual

Maverick I™
Commercial Packaged Rooftop System
Heating & Cooling

Gas/Electric

Models MPS015AG - 020AG
15 to 20 Tons

Installat

ion and Maintenance Manual

IM 863

Group: Applied Systems

Part Number: 92-102421-08-00

Date: March 2007

© 2007 McQuay International

ARI Standard
210/240 UAC

™

2 IM 863

Table of Contents

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

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

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

Equipment Protection . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

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

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

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Outside Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Attaching Exhaust and Combustion Air Inlet Hoods . . . . . . . . . 13

Cover Panel Installation/Conversion Procedure . . . . . . . . . . . . 14

Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Rooftop Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Return Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Gas Supply, Condensate Drain and Piping. . . . . . . 17

Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

LP Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Adjusting or Checking Furnace Input. . . . . . . . . . . . . . . . . . . . . 19

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Hook-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

208 Volt Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Furnace Section Controls and Ignition System . . . 22

Normal Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Normal Heat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

To Start Furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

To Shut Down Furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Burners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Manual Reset Overtemperature Control . . . . . . . . . . . . . . . . . . 24

Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Cooling Section Operation . . . . . . . . . . . . . . . . . . . . 24

Cooling Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Continuous Fan Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

System Operating Information . . . . . . . . . . . . . . . . . 25

Advise The Customer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Furnace Section Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Cooling Section Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 26

To Inspect The Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . 26

Cleaning Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Cleaning Condenser Coil, Condenser Fan,

Circulation Air Blower and Venturi . . . . . . . . . . . . . . . . . . . 26

Re-Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Air-Flow Performance Charts . . . . . . . . . . . . . . . 27-28

Electrical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-30

Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . 31-33

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . 34-39

Charging Charts . . . . . . . . . . . . . . . . . . . . . . . . . . 40-41

IM 863

3

Introduction

This manual contains the installation and operating instruc­tions for your packaged rooftop system. There are a few 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

This manual contains the installation and operating instruc­tions for your combination gas heating/electric cooling 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.

Equipment Protection From The
Environment

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 unit is available in 250,000 AND 350,000 BTUH heating
input with nominal cooling capacity of 15 tons. 300,000 and
400,000 BTUH heating inputs are available in nominal cool­ing capacity of 20 tons. Units are convertible from bottom
supply and return to side supply and return by relocation of
supply and return air cover panels. See cover installation
detail and Figures 10 &11.

The units are weatherized for mounting outside of the build­ing.

Major Components

The unit includes a hermetically-sealed refrigerating system
consisting of a scroll compressor, condenser coil, evaporator
coil with capillary tube assembly, a supply air fan, a condens­er fan, a heat exchanger assembly, gas burner and control
assembly, combustion air motors 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

!

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 863

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. 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.

▲▲

DANGER

!

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 863

5

Figure 1: Unit Dimensions - Bottom View

Figure 2: Supply and Return Dimensions for Downflow Applications - Bottom View

Unit Dimensions

FOR CLEARANCES SEE PAGE 28, FIGURE 12.

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

ST-A0886-02

ST-A0886-07

SUPPLY

AIR

RETURN

AIR

6 IM 863

Figure 3: Component Locations & Dimensions

ST-A0886-04

Figure 4: Component Locations & Dimensions

ST-A0886-06

Figure 5: Component Locations

ST-A0886-27

GAS SUPPLY

(SIDE ENTRY)

3/4” INLET

FILTER OPENING

BLOWERS

FURNACE

INDOOR MOTOR

COMPRESSOR #1

COMPRESSOR #2

INDOOR COIL

OUTDOOR FAN #1

OUTDOOR FAN #2

BLOWER ACCESS

FLUE HOODS

POWER ENTRY

CONDENSATE DRAIN
1” FNPT

COMBUSTION
AIR INLETS

COMPRESSOR ACCESS

CONTROL/FILTER
ACCESS

FURNACE ACCESS

33.250

5.625

144.750

OPTIONAL OUTDOOR
AIR HOOD LOCATION

DISCONNECT

LOCATION

OPTIONAL EXHAUST

HOOD LOCATION

50.000

50.000

17.708

5.625

33.250

44.651

146.094

CONDENSATE DRAIN

HIGH/LOW CIRCUIT #1

HIGH/LOW CIRCUIT #3

HIGH/LOW CIRCUIT #2

HIGH/LOW CIRCUIT #4

HIGH PRESSURE SWITCH

CRKT #1

HIGH PRESSURE SWITCH

CRKT #3

HIGH PRESSURE SWITCH

CRKT #2

HIGH PRESSURE SWITCH

CRKT #4

57.438

OUTDOOR FAN #4

OUTDOOR FAN #3

CONTROL COMPARTMENT

DISCONNECT

LOCATION

IM 863

7

Figure 7: Component Access Locations & Dimensions

ST-A0886-05

ST-A0886-03

Figure 8: Component Locations

ST-A0886-28

Figure 6: Dimensions – Back View

OUTDOOR FAN #4

SUPPLY COVER

RETURN COVER

COMPRESSOR ACCESS

146.094

3.815

46.185

58.836

4.610

6.843

13.719

19.594

24.319

25.869

6.230

REMOVE COVER PLATE WHEN

CONVERTING FROM DOWNFLOW

TO HORIZONTAL CONFIGURATION.

OUTDOOR FAN #3

OUTDOOR COIL

COMPRESSOR #4

COMPRESSOR #3

HEAT EXCHANGER

FILTER RACK

RETURN COMPARTMENT

OUTDOOR FAN #1

OUTDOOR FAN #2

42.750

146.094

18.443

5.876

20.000

4.483

13.344

7.220

47.221

50.000

3.730

8 IM 863

General Data

[] Designates Metric Conversions

NOM. SIZES 15 & 20 TON S [52.8-70.3 kW] ASHRAE 90.1-2004 COMPLIANT MODELS

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 a

t 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 ab

ove sea level.

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

Model MPS- 015AGCL25E 015AGCL35E 015AGCM25E 015AGCM35E
Cooling Performance

1

CONTINUED

Gross Cooling Capacity Btu [kW] 188,000 [55.1] 188,000 [55.1] 188,000 [55.1] 188,000 [55.1]

2

EER/SEER

10.2/NA 10.2/NA 10.2/NA 10.2/NA
Nominal CFM/ARI Rated CFM [L/s] 6000/6000 [2831/2831] 6000/6000 [2831/2831] 6000/6000 [2831/2831] 6000/6000 [2831/2831]
ARI Net Cooling Capacity Btu [kW] 180,000 [52.7] 180,000 [52.7] 180,000 [52.7] 180,000 [52.7]
Net Sensible Capacity Btu [kW] 134,000 [39.3] 134,000 [39.3] 134,000 [39.3] 134,000 [39.3]
Net Latent Capacity Btu [kW] 46,000 [13.5] 46,000 [13.5] 46,000 [13.5] 46,000 [13.5]
Integrated Part Load Value

3

10.4 10.4 10.4 10.4

Net System Power kW 17.6 17.6 17.6 17.6

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] (1st Stage /2nd Stage) 125,000/250,000 175,000/350,000 125,000/250,000 175,000/350,000
Heating Output Btu [kW] (1st Stage /2nd Stage) 101,500/203,000 142,000/284,000 [41.6/83.2] 101,500/203,000 142,000/284,000 [41.6/83.2]
Temperature Rise Range °F [°C] 15-45 [8.3/25] 30-60 [16.7/33.3] 15-45 [8.3/25] 30-60 [16.7/33.3]
Steady State Efficiency (%) 81 81 81 81
No. Burners 10 14 10 14
No. Stages 2 2 2 2
Gas Connection Pipe Size in. [mm] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05]

Compressor

Qty./Type 4/Scroll 4/Scroll 4/Scroll 4/Scroll

Outdoor Sound Rating (dB)

5

91 91 91 91

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] 36 [3.34] 36 [3.34] 36 [3.34] 36 [3.34]
Rows / FPI [FPcm] 1 / 22 [9] 1 / 22 [9] 1 / 22 [9] 1 / 22 [9]

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] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46]
Rows / FPI [FPcm] 4 / 13 [5] 4 / 13 [5] 4 / 13 [5] 4 / 13 [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] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1 Direct/1 Direct/1
CFM [L/s] 16000 [7550] 16000 [7550] 16000 [7550] 16000 [7550]
No. Motors/HP 4 at 1/3 HP 4 at 1/3 HP 4 at 1/3 HP 4 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] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6]
Drive Type/No. Speeds Belt/Variable Belt/Variable Belt/Variable Belt/Variable
No. Motors 1 1 1 1
Motor HP 3 3 5 5
Motor RPM 1725 1725 1725 1725
Motor Frame Size 56 56 184 184

Filter—Type Disposable Disposable Disposable Disposable

Furnished Yes Yes Yes Yes
(No.) Size Recommended in. [mm] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457]

(3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610]

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 82/72 [2325/2041] 82/72 [2325/2041] 82/72 [2325/2041] 82/72 [2325/2041]
Weights

Net Weight lbs. [kg] 1790 [812] 1817 [824] 1820 [826] 1847 [838]
Ship Weight lbs. [kg] 2010 [912] 2037 [924] 2040 [925] 2067 [938]

IM 863

9

General Data

[] Designates Metric Conversions

NOM. SIZES 15 & 20 TONS [52.8-70.3 kW] ASHRAE 90.1-2004 COMPLIANT MODELS

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 a

t 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 ab

ove sea level.

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

Model MPS- 015AGDL25E 015AGDL35E 015AGDM25E 015AGDM35E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 188,000 [55.1] 188,000 [55.1] 188,000 [55.1] 188,000 [55.1]

2

EER/SEER

10.2/NA 10.2/NA 10.2/NA 10.2/NA
Nominal CFM/ARI Rated CFM [L/s] 6000/6000 [2831/2831] 6000/6000 [2831/2831] 6000/6000 [2831/2831] 6000/6000 [2831/2831]
ARI Net Cooling Capacity Btu [kW] 180,000 [52.7] 180,000 [52.7] 180,000 [52.7] 180,000 [52.7]
Net Sensible Capacity Btu [kW] 134,000 [39.3] 134,000 [39.3] 134,000 [39.3] 134,000 [39.3]
Net Latent Capacity Btu [kW] 46,000 [13.5] 46,000 [13.5] 46,000 [13.5] 46,000 [13.5]
Integrated Part Load Value

3

10.4 10.4 10.4 10.4

Net System Power kW 17.6 17.6 17.6 17.6

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] (1st Stage /2nd Stage) 125,000/250,000 [36.6/73.2]175,000/350,000 [51.3/102.6]125,000/250,000 [36.6/73.2]175,000/350,000 [51.3/102.6]
Heating Output Btu [kW] (1st Stage /2nd Stage) 101,500/203,000 [29.7/59.5] 142,000/284,000 [41.6/83.2] 101,500/203,000 [29.7/59.5] 142,000/284,000 [41.6/83.2]
Temperature Rise Range °F [°C] 15-45 [8.3/25] 30-60 [16.7/33.3] 15-45 [8.3/25] 30-60 [16.7/33.3]
Steady State Efficiency (%) 81 81 81 81
No. Burners 10 14 10 14
No. Stages 2 2 2 2
Gas Connection Pipe Size in. [mm] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05]

Compressor

Qty./Type 4/Scroll 4/Scroll 4/Scroll 4/Scroll

Outdoor Sound Rating (dB)

5

91 91 91 91

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] 36 [3.34] 36 [3.34] 36 [3.34] 36 [3.34]
Rows / FPI [FPcm] 1 / 22 [9] 1 / 22 [9] 1 / 22 [9] 1 / 22 [9]

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] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46]
Rows / FPI [FPcm] 4 / 13 [5] 4 / 13 [5] 4 / 13 [5] 4 / 13 [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] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1 Direct/1 Direct/1
CFM [L/s] 16000 [7550] 16000 [7550] 16000 [7550] 16000 [7550]
No. Motors/HP 4 at 1/3 HP 4 at 1/3 HP 4 at 1/3 HP 4 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] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6]
Drive Type/No. Speeds Belt/Variable Belt/Variable Belt/Variable Belt/Variable
No. Motors 1 1 1 1
Motor HP 3 3 5 5
Motor RPM 1725 1725 1725 1725
Motor Frame Size 56 56 184 184

Filter—Type Disposable Disposable Disposable Disposable

Furnished Yes Ye s Yes Ye s
(No.) Size Recommended in. [mm] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457]

(3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610]

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 82/72 [2325/2041] 82/72 [2325/2041] 82/72 [2325/2041] 82/72 [2325/2041]
Weights

Net Weight lbs. [kg] 1806 [819] 1841 [835] 1836 [833] 1871 [849]
Ship Weight lbs. [kg] 2026 [919] 2061 [935] 2056 [933] 2091 [948]

CONTINUED

10 IM 863

General Data

[] Designates Metric Conversions

NOM. SIZES 15 & 20 TON S [52.8-70.3 kW] ASHRAE 90.1-2004 COMPLIANT MODELS

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 a

t 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 ab

ove sea level.

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

Model MPS- 015AGYL35E 015AGYM35E 020AGCL30E 020AGCL40E
Cooling Performance

1

CONTINUED

Gross Cooling Capacity Btu [kW] 188,000 [55.1] 188,000 [55.1] 246,000 [72.1] 246,000 [72.1]

2

EER/SEER

10.2/NA 10.2/NA 9.7/NA 9.7/NA
Nominal CFM/ARI Rated CFM [L/s] 6000/6000 [2831/2831] 6000/6000 [2831/2831] 7700/7400 [3634/3492] 7700/7400 [3634/3492]
ARI Net Cooling Capacity Btu [kW] 180,000 [52.7] 180,000 [52.7] 232,000 [68] 232,000 [68]
Net Sensible Capacity Btu [kW] 134,000 [39.3] 134,000 [39.3] 168,000 [49.2] 168,000 [49.2]
Net Latent Capacity Btu [kW] 46,000 [13.5] 46,000 [13.5] 64,000 [18.8] 64,000 [18.8]
Integrated Part Load Value

3

10.4 10.4 9.9 9.9

Net System Power kW 17.6 17.6 23.9 23.9

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] (1st Stage /2nd Stage) 175,000/350,000 [51.3/102.6] 175,000/350,000 [51.3/102.6] 150,000/300,000 [44/87.9] 200,000/400,000 [58.6/117.2]
Heating Output Btu [kW] (1st Stage /2nd Stage) 142,000/284,000 [41.6/83.2] 142,000/284,000 [41.6/83.2] 121,500/243,000 [35.6/71.2] 162,000/324,000 [47.5/94.9]
Temperature Rise Range °F [°C] 30-60 [16.7/33.3] 30-60 [16.7/33.3] 15-45 [8.3/25] 25-55 [13.9/30.6]
Steady State Efficiency (%) 81 81 81 81
No. Burners 14 14 12 14
No. Stages 2 2 2 2
Gas Connection Pipe Size in. [mm] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05]

Compressor

Qty./Type 4/Scroll 4/Scroll 4/Scroll 4/Scroll

Outdoor Sound Rating (dB)

5

91 91 91 91

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] 36 [3.34] 36 [3.34] 36 [3.34] 36 [3.34]
Rows / FPI [FPcm] 1 / 22 [9] 1 / 22 [9] 2 / 22 [9] 2 / 22 [9]

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] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46]
Rows / FPI [FPcm] 4 / 13 [5] 4 / 13 [5] 4 / 13 [5] 4 / 13 [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] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1 Direct/1 Direct/1
CFM [L/s] 16000 [7550] 16000 [7550] 16000 [7550] 16000 [7550]
No. Motors/HP 4 at 1/3 HP 4 at 1/3 HP 4 at 1/3 HP 4 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] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6]
Drive Type/No. Speeds Belt/Variable Belt/Variable Belt/Variable Belt/Variable
No. Motors 1 1 1 1
Motor HP 3 5 5 5
Motor RPM 1725 1725 1725 1725
Motor Frame Size 56 184 184 184

Filter—Type Disposable Disposable Disposable Disposable

Furnished Yes Ye s Yes Ye s
(No.) Size Recommended in. [mm] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457]

(3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610]

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 82/72 [2325/2041] 82/72 [2325/2041] 117/107 [3317/3033] 117/107 [3317/3033]
Weights

Net Weight lbs. [kg] 1841 [835] 1871 [849] 1972 [894] 1988 [902]
Ship Weight lbs. [kg] 2061 [935] 2091 [948] 2192 [994] 2208 [1002]

IM 863

11

General Data

[] Designates Metric Conversions

NOM. SIZES 15 & 20 TONS [52.8-70.3 kW] ASHRAE 90.1-2004 COMPLIANT MODELS

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 a

t 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 ab

ove sea level.

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

Model MPS- 020AGCM30E 020AGCM40E 020GDL30E 020AGDL40E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 246,000 [72.1] 246,000 [72.1] 246,000 [72.1] 246,000 [72.1]

2

EER/SEER

9.7/NA 9.7/NA 9.7/NA 9.7/NA
Nominal CFM/ARI Rated CFM [L/s] 7700/7400 [3634/3492] 7700/7400 [3634/3492] 7700/7400 [3634/3492] 7700/7400 [3634/3492]
ARI Net Cooling Capacity Btu [kW] 232,000 [68] 232,000 [68] 232,000 [68] 232,000 [68]
Net Sensible Capacity Btu [kW] 168,000 [49.2] 168,000 [49.2] 168,000 [49.2] 168,000 [49.2]
Net Latent Capacity Btu [kW] 64,000 [18.8] 64,000 [18.8] 64,000 [18.8] 64,000 [18.8]
Integrated Part Load Value

3

9.9 9.9 9.9 9.9

Net System Power kW 23.9 23.9 23.9 23.9

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] (1st Stage /2nd Stage) 150,000/300,000 [44/87.9] 200,000/400,000 [58.6/117.2] 150,000/300,000 [44/87.9] 200,000/400,000 [58.6/117.2]
Heating Output Btu [kW] (1st Stage /2nd Stage) 121,500/243,000 [35.6/71.2] 162,000/324,000 [47.5/94.9] 121,500/243,000 [35.6/71.2] 162,000/324,000 [47.5/94.9]
Temperature Rise Range °F [°C] 15-45 [8.3/25] 25-55 [13.9/30.6] 15-45 [8.3/25] 25-55 [13.9/30.6]
Steady State Efficiency (%) 81 81 81 81
No. Burners 12 14 12 14
No. Stages 2 2 2 2
Gas Connection Pipe Size in. [mm] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05] 0.75 [19.05]

Compressor

Qty./Type 4/Scroll 4/Scroll 4/Scroll 4/Scroll

Outdoor Sound Rating (dB)

5

91 91 91 91

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] 36 [3.34] 36 [3.34] 36 [3.34] 36 [3.34]
Rows / FPI [FPcm] 2 / 22 [9] 2 / 22 [9] 2 / 22 [9] 2 / 22 [9]

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] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46] 15.75 [1.46]
Rows / FPI [FPcm] 4 / 13 [5] 4 / 13 [5] 4 / 13 [5] 4 / 13 [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] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6] 4/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1 Direct/1 Direct/1
CFM [L/s] 16000 [7550] 16000 [7550] 16000 [7550] 16000 [7550]
No. Motors/HP 4 at 1/3 HP 4 at 1/3 HP 4 at 1/3 HP 4 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] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6]
Drive Type/No. Speeds Belt/Variable Belt/Variable Belt/Variable Belt/Variable
No. Motors 1 1 1 1
Motor HP 7.5 7.5 5 5
Motor RPM 1725 1725 1725 1725
Motor Frame Size 213 213 184 184

Filter—Type Disposable Disposable Disposable Disposable

Furnished Yes Ye s Yes Ye s
(No.) Size Recommended in. [mm] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457]

(3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610]

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 117/107 [3317/3033] 117/107 [3317/3033] 117/107 [3317/3033] 117/107 [3317/3033]
Weights

Net Weight lbs. [kg] 1994 [904] 2010 [912] 1996 [905] 2020 [916]
Ship Weight lbs. [kg] 2214 [1004] 2230 [1012] 2216 [1005] 2240 [1016]

CONTINUED

12 IM 863

General Data

[] Designates Metric Conversions

NOM. SIZES 15 & 20 TONS [52.8-70.3 kW] ASHRAE 90.1-2004 COMPLIANT MODELS

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 a

t 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 ab

ove sea level.

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

Model MPS- 020AGDM30E 020AGDM40E
Cooling Performance

1

Gross Cooling Capacity Btu [kW] 246,000 [72.1] 246,000 [72.1]

2

EER/SEER

9.7/NA 9.7/NA
Nominal CFM/ARI Rated CFM [L/s] 7700/7400 [3634/3492] 7700/7400 [3634/3492]
ARI Net Cooling Capacity Btu [kW] 232,000 [68] 232,000 [68]
Net Sensible Capacity Btu [kW] 168,000 [49.2] 168,000 [49.2]
Net Latent Capacity Btu [kW] 64,000 [18.8] 64,000 [18.8]
Integrated Part Load Value

3

9.9 9.9

Net System Power kW 23.9 23.9

Heating Performance (Package Gas/Electric)

4

Heating Input Btu [kW] (1st Stage /2nd Stage) 150,000/300,000 [44/87.9] 200,000/400,000 [58.6/117.2]
Heating Output Btu [kW] (1st Stage /2nd Stage) 121,500/243,000 [35.6/71.2] 162,000/324,000 [47.5/94.9]
Temperature Rise Range °F [°C] 15-45 [8.3/25] 25-55 [13.9/30.6]
Steady State Efficiency (%) 81 81
No. Burners 12 14
No. Stages 2 2
Gas Connection Pipe Size in. [mm] 0.75 [19.05] 0.75 [19.05]

020AGYL40E

246,000 [72.1]

9.7/NA

7700/7400 [3634/3492]

232,000 [68]

168,000 [49.2]

64,000 [18.8]

9.9

23.9

200,000/400,000

162,000/324,000 [47.5/94.9]

25-55 [13.9/30.6]

81
14

2

0.75 [19.05]

020AGYM40E

246,000 [72.1]

7700/7400 [3634/3492]

232,000 [68]

168,000 [49.2]

64,000 [18.8]

200,000/400,000 [58.6/117.2]

162,000/324,000 [47.5/94.9]

25-55 [13.9/30.6]

0.75 [19.05]

Compressor

Qty./Type 4/Scroll 4/Scroll

Outdoor Sound Rating (dB)

5

91 91

Outdoor Coil—Fin Type Louvered Louvered

Tube Type Rifled Rifled
Tube Size in. [mm] OD 0.375 [9.5] 0.375 [9.5]
Face Area sq. ft. [sq. m] 36 [3.34] 36 [3.34]
Rows / FPI [FPcm] 2 / 22 [9] 2 / 22 [9]

Indoor Coil—Fin Type Louvered Louvered

Tube Type Rifled Rifled
Tube Size in. [mm] 0.375 [9.5] 0.375 [9.5]
Face Area sq. ft. [sq. m] 15.75 [1.46] 15.75 [1.46]
Rows / FPI [FPcm] 4 / 13 [5] 4 / 13 [5]
Refrigerant Control Capillary Tubes Capillary Tubes
Drain Connection No./Size in. [mm] 1/1 [25.4] 1/1 [25.4]

Outdoor Fan—Type Propeller Propeller

No. Used/Diameter in. [mm] 4/24 [609.6] 4/24 [609.6]
Drive Type/No. Speeds Direct/1 Direct/1
CFM [L/s] 16000 [7550] 16000 [7550]
No. Motors/HP 4 at 1/3 HP 4 at 1/3 HP
Motor RPM 1075 1075

Indoor Fan—Type FC Centrifugal FC Centrifugal

No. Used/Diameter in. [mm] 2/18x9 [457.2x228.6] 2/18x9 [457.2x228.6]
Drive Type/No. Speeds Belt/Variable Belt/Variable
No. Motors 1 1
Motor HP 7.5 7.5
Motor RPM 1725 1725
Motor Frame Size 213 213

Filter—Type Disposable Disposable

Furnished Yes Ye s
(No.) Size Recommended in. [mm] (3)2x18x18 [51x457x457] (3)2x18x18 [51x457x457]

(3)2x18x24 [51x457x610] (3)2x18x24 [51x457x610]

Refrigerant Charge Oz. (Sys. 1/Sys. 2) [g] 117/107 [3317/3033] 117/107 [3317/3033]

4/Scroll

91

Louvered

Rifled

0.375 [9.5]
36 [3.34]

2 / 22 [9]

Louvered

Rifled

0.375 [9.5]

15.75 [1.46]
4 / 13 [5]

Capillary Tubes

1/1 [25.4]

Propeller

4/24 [609.6]

Direct/1

16000 [7550]

4 at 1/3 HP

1075

FC Centrifugal

2/18x9 [457.2x228.6]

Belt/Variable

1
5

1725

184

Disposable

Yes
(3)2x18x18 [51x457x457]
(3)2x18x24 [51x457x610]

117/107 [3317/3033]

4/Scroll

Louvered

0.375 [9.5]
36 [3.34]
2 / 22 [9]
Louvered

0.375 [9.5]

15.75 [1.46]
4 / 13 [5]

Capillary Tubes

1/1 [25.4]

Propeller

4/24 [609.6]

Direct/1

16000 [7550]

4 at 1/3 HP

FC Centrifugal

2/18x9 [457.2x228.6]

Belt/Variable

Disposable

(3)2x18x18 [51x457x457]
(3)2x18x24 [51x457x610]

117/107 [3317/3033]

Weights

Net Weight lbs. [kg] 2018 [915] 2042 [926]
Ship Weight lbs. [kg] 2238 [1015] 2262 [1026]

2020 [916]

2240 [1016]

2042 [926]

2262 [1026]

9.7/NA

9.9

23.9

81
14

2

91

Rifled

Rifled

1075

1

7.5

1725

213

Yes

IM 863

13

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

IMPORTANT: Before operating unit, remove compressor ship­ping supports from the compressor base. Failure to remove sup­ports will casue noise and vibration.

Location Consideratons

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 building

away from the waterfront.

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

4 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.

5 Regular cleaning and waxing of the cabinet with an auto-

mobile polish will provide some protection.

6 A 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 9.)

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 Locate the unit to provide proper access for inspection

and servicing as shown in Figure 12.

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. These hoods are shipped in
cartons in the blower compartment inside the unit and must be
attached when the unit is installed. See Figure 4.

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

!

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

!

14 IM 863

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

3.

2 Remove exhaust/combustion air inlet hoods from the car-

tons, located inside the blower compartment.

3 Attach blower access panel.

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

Reference Figure 4 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.

Horizontal Conversion Procedure

Downflow to Horizontal

1 Remove the screws and covers from the outside of the

supply and return sections. Also remove and discard
cover plate. See Figure 7.

2 Install the covers over the bottom supply and return

openings, painted side up, inserting the leading flange
under the bracket provided. Place the back flange to top
of the front bracket provided. See Figures 10

and 11.

3 Secure the return and supply cover to front bracket with

two (2) screws.

Filter Replacement

This unit is provided with 3 - 18” X 18” X 2” and 3 - 18” X
24” X 2” disposable filters. When replacing filters, ensure
they are inserted fully to the back to prevent bypass. See
Figure 5.

Recommended supplier of this filter is:

AAF International
Part #: 54-42541-01 (18" x 18" x 2")

Part #: 54-42541-03 (18" x 24" x 2")

Figure 9: Outside Slab Installation. Closet Distribution
System. Slab Floor Construction

ST-A0886-25

Figure 10: Horizontal Conversion Detail

ST-A0886-30

Figure 11: Horizontal Conversion Detail

ST-A0886-31

IM 863

15

Figure 12: Clearances

ST-A0886-09

FIGURE 13: Flat Rooftop Installation, Attic or Drop Ceiling Distributing System.
Mounted on Roofcurb. Curb must be level.

ST-A0886-10

Clearances

The following minimum clearances must be observed for prop­er unit performance and serviceability. Reference Figure 12.

16 IM 863

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 14, 15, 16

and 17.

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 2” of insulation and a vapor barrier.
Distribution system in attic, furred space or crawl space
should be insulated with at least 2” of insulation.

1

⁄2” to 1”
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/building owner must be
informed against changes in construction which might change
this to a “confined space.” Also, caution the user/building owner
against installation of additional equipment, such as power venti­lators, 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

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

!

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

!

ST-A0886-12

Figure 15: Lifting Detail

ST-A1084-01

Figure 14: Shipping Board Removal

REMOVE SHIPPING BOARDS
BEFORE INSTALLING UNIT.

CENTER OF

GRAVITY

CENTER OF

GRAVITY

32.9ⴖ

835.6 mm

67.1ⴖ

1704.3 mm

IM 863

17

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 valve supplied with unit.

Routing can be through the gas pipe opening shown in
Figures 9 or 13A or 13B or through the base as shown in
Figure 22.

3 Size the gas line to the furnace adequate enough to pre-

vent undue pressure drop and never less than 1/2”.

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 18.)

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.

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

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

Figure 16: Roofcurb Figure 17: Roofcurb

ST-A0888-02

ST-A0888-02

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.

▲▲

DANGER

!

18 IM 863

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 3.

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 unit to use liquefied petroleum (LP) gas by
replacing with the stem/spring assembly supplied in the con­version kit. The LP gas valve maintains the proper manifold
pressure for LP gas. The correct burner LP orifices are includ­ed in the kit.

See Figure 19A for component locations.

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.

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

!

Figure18: 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

Figure 19A: Heat Exchanger Component Identification

ST-A0886-29

IM 863

19

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 4: 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. = 3/4” IPS required.

Figure 19B: Honeywell VR8305Q4120 Two Stage Gas Valve

OUTLET PRESSURE
TAP-1/8 NPT

2-STAGE
OPERATOR

INLET PRESSURE
TAP-1/8 NPT

GROUND
TERMINAL

LOW STAGE ADJUSTMENT
UNDER VENT CAP

HIGH STAGE ADJUSTMENT
UNDER VENT CAP

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. See Figure 19B.

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 vent
cover and turn the adjustment screw clockwise to increase
pressure or counterclockwise to decrease pressure. See Figure
19B. Then replace the regulator vent cover 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.

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 USAor
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 1” NPT. IMPORTANT: Install a condensate trap to

ensure proper condensate drainage. See Figure 20.

250,000 ONE 13.0 14.4 15.0 15.8 36.0

TEN 2 10 2 24 2 302 386 0

ONE 10.8 12.0 12.5 13.2 30.0

300,000

TEN 1 48 2 0 2 5 2 12 5 0

ONE 9.3 10.3 10.7 1.3 25.7

350,000

TEN 1 33 143 1471 53 417

ONE 8.1 9.0 9.36 9 .9 22.5

400,000

TEN 1 21 1 30136139 3 45

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 5

20 IM 863

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.

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 6 using the circuit ampaci­ty found on the unit rating plate. Use the smallest wire
size allowable from the unit disconnect to unit.

4 For through the base wiring entry reference Figure 22.

All fittings and conduit are field supplied for this applica­tion. Reference the chart with Figure 22 for proper hole
and conduit size.

NOTES:

1 For branch circuit wiring (main power supply to unit discon-

nect), the minimum wire size for the length of run can be
determined from this table using the circuit ampacity found
on the unit rating plate. From the unit disconnect to unit, the
smallest wire size allowable in Table 6 may be used, as the
disconnect must be in sight of the unit.

2 Wire size based on 75°C rated wire insulation for 1% volt-

age drop.

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

N.E.C. (C.E.C. in Canada) for derating the ampacity of
each conductor.

IMPORTANT: THIS UNIT IS APPROVED FOR USE WITH
COPPER CONDUCTORS ONL

Y CONNECTED TO UNIT CON-

TACTOR.

WARRANTY WILL BE VOIDED IF ALUMINUM WIRE IS CON-
NECTED TO UNIT CONTACTOR.

Figure 20: Condensate Drain

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

!

Figure 21: Recommended Branch Circuit Disconnect
Location

ST-A0886-11

DO NOT OVERTIGHTEN DRAIN FITTING

Hook-Up

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

Refer to Figures 2 and 22 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

A diagram of the internal wiring of this unit is located on the
inside of control access panel and in 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.

208 Volt Applications

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 7.

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

IM 863

21

Figure 22: Base Entry Locations

ST-A0886-14

Figure 23: 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).

Table 6: Branch Circuit Wire Size

COPPER

WIRE SIZE—AWG

SUPPLY WIRE LENGTH—FEET

50 100 150 200 250 300

20 10 8 6 4 4 4
25 10 8 6 4 4 3

308644 3 2
358643 21

408643 21
45 8 4 3 2 1 1/0
50 6 4 3 2 1 1/0
60 6 4 2 1 1/0 2/0
70 4 3 2 1/0 2/0 3/0

80 4 3 1 1/0 2/0 3/0

90 3 2 1/0 2/0 3/0 4/0
100 3 2 1/0 2/0 3/0 4/0
110 2 1 2/0 3/0 4/0 250
125 1 1 2/0 3/0 4/0 25

UNIT
MCA

Table 7

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.

FIELD GAS
CONNECTIONS

STRAIGHT CONDUIT

FITTING SIZED

PER CHART

CONDUIT FROM
POWER SUPPLY

SIZED PER CHART

WIRE SIZE FROM

MIN. CIRCUIT AMPACITY

CUT HOLE

SIZED PER CHART

OR USE KNOCK OUT

CONTROL VOLTAGE

KNOCKOUT

POWER WIRES

FROM DISCONNECT

TO CONTACTOR

POWER WIRES
TO DISCONNECT

WIRE FROM

ZONE THERMOSTAT

STRAIGHT CONDUIT

FITTING

CONDUIT FROM

ZONE THERMOSTAT

WASHERS

Furnace Section Controls and
Ignition Systems

Normal Furnace Operating Sequence

This unit has a two stage gas furnace which employs an inte­grated furnace control with self diagnostics located in the con­trol box. The furnace is composed of induced draft blowers,
negative pressures switches, two stage gas valve, manifold
orifices, inshot burners, direct spark ignitor, remote flame
sense, tubular heat exchanger, high limit switch and rollout
switches. See Figure 24.

Normal Heat Mode

Call For First Stage (low fire) Only:

1 Zone thermostat contacts close, a call for first stage

(low fire) heat is initiated.

2 Control runs self check.

3 Control checks the high-limit switch for normally

closed contacts, each pressure switch for normally open
contacts, and all flame rollout switches for continuity.

4 Control energizes each inducer.

5 Control checks each pressure switch for closure.

6 If each pressure switch is closed, the control starts a 30

second prepurge and energizes W2. If any pressure
switch is still open, the inducers will continue to be
energized until closure.

7 After prepurge timeout, control energizes W1 and con-

tinues to energize W2, initiates spark for 2 seconds
minimum, 7 second maximum ignition trial, initiates
120 second, second stage (high fire) warm up timing.

8 Control detects flame, de-energizes spark and initiates

45 second delay on blower timing.

9 After a fixed 45 seconds indoor blower delay on, the

control energizes the indoor blower.

10 After a fixed 120 seconds second stage warmup period

control checks thermostat input. If only W1 is called
for, W2 is de-energized and the control starts a 30 sec­ond off delay on the W2 inducer(s).

11 After fixed 30 seconds the W2 inducers is de-ener-

gized.

12 Control enters normal operating loop where all inputs

are continuously checked.

13 Zone thermostat is satisfied.

14 Control de-energizes gas valve.

15 Control senses loss of flame.

16 Control initiates 5 second inducer postpurge and 90

second indoor blower delay off.

17 Control de-energizes inducer blower(s).

18 Control de-energizes indoor blower.

19 Control in the stand by mode with solid red LED.

Call For Second Stage, After First Stage
Established; Starting from A.11:

1 If a call for second stage (high fire) is initiated after a

call for first stage heat is established, the control veri­fies W2 pressure switches for normally open contacts.
The control energizes the W2 inducers and energizes
the second stage of the gas valve.

2 Control enters normal operating loop where all inputs

are continuously checked.

Second Stage Satisfied; First Stage Still Called For;
Star

ting From B.3:

1 Once the call for second stage is satisfied, the control

starts a 30 second off delay on W2 inducers and
reduces the gas valve to first stage.

2 Control enters normal operating loop where all inputs

are continuously checked.

First Stage Satisfied:

1 Zone thermostat is satisfied.

2 Control de-energizes gas valve.

3 Control senses loss of flame.

4 Control initiates 5 second inducer postpurge and 90

second indoor blower delay off.

5 Control de-energizes inducer blower.

6 Control de-energizes indoor blower.

7 Control in the stand by mode with solid red LED.

22 IM 863

Figure 24

ST-A0886-29

IM 863

23

First Stage and Second Stage Called
Simultaneously:

1 Zone thermostat contacts close, a call for first stage

(low fire) and second stage (high fire) heat is initiated.

2 Control runs self check.

3 Control checks the high-limit switch for normally

closed contacts, each pressure switch for normally open
contacts, and all flame rollout switches for continuity.

4 Control energizes each inducer.

5 Control checks each pressure switch for closure.

6 If each pressure switch is closed, the control starts a 30

second prepurge and energizes W2. If either switch is
still open, the inducers will continue to be energized
until closure.

7 After prepurge timeout, control energizes W1 and con-

tinues to energize W2, initiates spark for 2 seconds
minimum, 7 second maximum ignition trial, and initi-
ates 120 second stage warm up timing.

8 Control detects flame, de-energizes spark and starts a

45 second indoor blower delay on timing.

9 After a fixed 45 seconds indoor blower delay on, the

control energizes the indoor blower.

10 After a fixed 120 seconds second stage warmup period

control checks the thermostat input. If W1 and W2 is
present control enters normal operating loop where all
inputs are continuously checked.

First Stage and Second Stage Removed Simultaneously:

1 Upon a loss of W1 and W2 the gas valve is de-ener-

gized.

2 Upon a loss of flame, each inducer will complete a 5

second postpurge and the indoor blower will complete a
90 second delay off.

3 Control in the stand by mode with solid red LED.

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 goes 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 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 igni-

tion.

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 Set the thermostat to its lowest setting.

2 Turn off all electric power to the unit.

3 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.

4 Remove control door.

5 Move control knob to the “OFF” position. Turn the

knob by hand only, do not use any kind of tool.

6 Wait five (5) minutes to clear out any gas. Then smell

for gas, including near the floor. If you smell gas,
STOP! Follow B in the safety information on the
Operating Instructions located on the back of the con­trols/access panel. If you don’t smell gas, go to the next
step.

7 Move the gas control knob from “OFF” position to

“ON” position. Operate this unit with the gas control

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.

▲▲

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

!

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

!

24 IM 863

knob in the “ON” position only. Do not use the gas
control knob as a means for throttling the burner input
rate.

8 Replace the control door.

9 Turn on all electric power to the unit.

10 Set the thermostat to the desired setting.

11 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 control knob 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

Four 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 four pressure switches for sensing a blocked
exhaust or a failed induced draft blower. They are normally
open and close when the induced draft blowers start, 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.

Cooling Section Operation

Cooling Mode

Call for first stage cooling

1 Zone thermostat contacts close and a call for cooling is

initiated.

2 Inputs ‘Y1’ and ‘G’ to the control are energized.

3 Control senses ‘Y1’ and ‘G’. After 1 sec. delay, control

energizes indoor blower and first stage compressor.

4 Control enters normal operating loop where all inputs

are continuously checked.

5 Zone thermostat is satisfied.

6 Control de-energizes indoor blower relay after 80 sec-

ond indoor blower delay off.

7 Control in the stand by mode with solid red LED.

Call for second stage cooling. After first stage cool­ing established: starting from A4.

1 If a call for second stage cooling is initiated after a call

for first stage cooling is established, the control ener­gizes Y2 and energizes the second stage compressor.

2 Control enters normal operating loop where all inputs

are continuously checked.

Second stage satisfied: first stage still called for:
starting from B2.

1 Y2 is de-energized and second stage compressor is de-

energized.

First stage and second stage called simultaneously.

1 Zone thermostat contacts close, a call for first and sec-

ond stage cooling is initiated.

2 Inputs Y1, Y2 and G to the control are energized.

3 Control senses Y1, Y2 and G, after 1 second delay,

control energizes indoor blower, first and second stage
compressor are energized.

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

!

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

▲▲

DANGER

!

IM 863

25

First stage and second stage removed simultan­ously.

1 Upon a loss of Y1 and Y2 each compressor is de-ener-

gized. Control either de-energizes indoor blower relay
after 80 second indoor blower delay off.

2 Control in the stand by mode with solid red LED.

Continuous Fan Mode

A ‘G’ input only indicates a zone thermostat call for continu­ous indoor blower operation.

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 con-

trol box cover.

4 Disconnect the gas supply piping from the gas valve.

5 Disconnect the wiring to the induced draft blower

motors, 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 (10) connecting the two induced

draft blowers to the collector box and screws (12) con­necting the inducer mounting plate to the heat exchang­er center panel. Remove the induced draft blowers and
the collector box from the unit.

9 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.

10 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.

11 Reassemble (steps 1 through 9 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.

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

!

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

!

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

!

26 IM 863

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 Open the control/filter access panel and remove filters.

Also, remove blower access panel. In downflow appli­cations remove the horizontal return to gain access.

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 condenser access end panel and/or com-

pressor access louver panel. Disconnect the wires to the
condenser fan motor in the control box (see wiring dia­gram).

2 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.

3 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.

4 The venturi should also be inspected for items of

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

5 Inspect the circulating air blower wheel and motor for

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

Re-assembly

1 Reconnect fan motor wires per the wiring diagram

attached to the back of the control cover.

2 Replace the control box cover.

3 Close the filter/control access panel and replace the

blower/evaporator coil access panels.

4 Restore electrical power to the unit and check for prop-

er 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 25 and 26 for determining cause of unit
problems.

Wiring Diagrams

Figures 27 through 32 are complete wiring diagrams for the
unit and its power sources. Also located on back of compres­sor access panel.

Charging

See Figures 33 and 34 for proper charging information.

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

!

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 863

27

E.S.P. - Inches of Water

15 TON PACKAGE UNIT - 60 Hz

———

—

637

653

669

685

701

717

733

749

765

———

—

1494

1738

1981

2224

2468

2711

2955

3198

3442

AIR-FLOW PERFORMANCE – 15 TON MODELS

TABLE 9

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3

1.4

1.5 1.6 1.7 1.8 1.9 2.0

STD

CFM

RPM RPM

WATTS WATTS

RPM

WATTS

RPM RPM

WATTS WATTS

RPM

WATTS

RPM

WATTS

RPM RPM

WATTS WATTS

RPM

WATTS

RPM

WATTS

RPM

WATTS

RPM

WATTS

RPM

WATTS

RPM RPM

WATTS WATTS

RPM RPM RPM RPM

WATTS WATTS WATTS WATTS

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

———

640

656

672

688

704

720

736

752

768

784

———

1394

1638

1881

2125

2368

2611

2855

3098

3342

3585

—

—

644

660

676

692

708

724

740

756

772

788

804

—

—

1294

1538

1781

2025

2268

2512

2755

2998

3242

3485

3729

631

647

663

679

695

711

727

743

759

775

791

807

877

951

1194

1438

1681

1925

2168

2412

2655

2899

3142

3385

3629

3821

650

666

682

698

714

731

747

763

779

795

811

881

890

1095

1338

1581

1825

2068

2312

2555

2799

3042

3286

3529

3695

4000

670

686

702

718

734

750

766

782

798

814

885

894

903

1238

1482

1725

1968

2212

2455

2699

2942

3186

3429

3569

3874

4179

689

705

721

737

753

769

785

801

817

889

898

907

916

1382

1625

1869

2112

2355

2599

2842

3086

3329

3442

3748

4053

4358

709

725

741

757

773

789

805

821

893

920

911

902

929

1525

1769

2012

2256

2499

2742

2986

3229

3316

3622

3927

4232

4538

728

744

760

776

792

808

888

897

906

915

924

933

942

1669

1912

2156

2399

2643

2886

2885

3190

3495

3801

4106

4411

4717

747

764

780

796

812

892

901

910

919

928

937

946

955

1812

2056

2299

2543

2786

2759

3064

3369

3675

3980

4285

4591

4896

767

783

799

815

896

905

914

923

932

941

950

959

968

1956

2199

2443

2686

2632

2938

3243

3548

3854

4159

4464

4770

5075

786

802

818

900

909

918

927

936

945

954

963

972

—

2100

2343

2586

2506

2812

3117

3422

3727

4033

4338

4643

4949

—

806

822

904

913

922

931

940

949

958

967

976

—

—

2243

2487

2380

2685

2991

3296

3601

3907

4212

4517

4823

—

—

899

908

917

926

935

944

953

962

971

980

989

—

—

1949

2254

2559

2864

3170

3475

3780

4086

4391

4696

5002

—

—

912

921

929

936

947

956

965

974

983

992

———

2128

2433

2738

3044

3349

3654

3960

4265

4570

4876

———

924

933

942

951

960

969

978

987

996

1005

———

2307

2612

2917

3223

3528

3833

4139

4444

4749

5055

———

937

946

955

964

973

982

991

1000

1009

———

—

950

959

968

977

986

995

1004

1013

—————

963

972

981

990

999

1008

1017

—————

—

976

985

994

1003

1012

1021

———————

2486

2791

3097

3402

3707

4012

4318

4623

4928

———

—

2665

2970

3276

3581

3886

4192

4497

4802

—————

2844

3149

3455

3760

4065

4371

4876

—————

—

3023

3329

3634

3939

4245

4550

———————

DRIVE PACKAGE L

3.0
BK-90

1VP-44

123 456

823 787

750

710 670 629

MOTOR HP

BLOWER SHEAVE

MOTOR SHEAVE

TURNS OPEN

RPM

NOTES: 1. Factory sheave settings shown in bold type.

2. Do not set sheave below minimum turns open shown.

3. Re-adjustment of sheave required to achieve rated airflow at ARI minimum E.S.P.

4. Drive data shown is for horizontal airflow with dry coil. Add component resistance

to duct resistance to determine total E.S.P.

DRIVE PACKAGE M

5

BK-72

1VP-44

1.5 2 3

4

56

1022 1017 1006

933

860 786

MOTOR HP

BLOWER SHEAVE

MOTOR SHEAVE

TURNS OPEN

RPM

COMPONENT RESISTANCE TABLE

CFM WET COIL DOWNFLOW

4800 0.020 0.010

5200 0.040 0.020

5600 0.060 0.030

6000 0.080 0.040

6400 0.100 0.050

6800 0.125 0.060

7200 0.150 0.070

28 IM 863

701

717

733

749

765

781

797

813

829

845

861

877

911

920

929

938

947

2468

2711

2955

3198

3442

3685

3929

4172

4415

4659

4902

5146

5726

6032

6337

6642

6948

AIR-FLOW PERFORMANCE – 20 TON MODELS

TABLE 10

E.S.P. - Inches of Water

20 TON PACKAGE UNIT - 60 Hz

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3

1.4

1.5 1.6 1.7 1.8 1.9 2.0

STD

CFM

RPM RPM

WATTS WATTS

RPM

WATTS

RPM RPM

WATTS WATTS

RPM

WATTS

RPM

WATTS

RPM RPM

WATTS WATTS

RPM

WATTS

RPM

WATTS

RPM

WATTS

RPM

WATTS

RPM

WATTS

RPM RPM

WATTS WATTS

RPM RPM RPM RPM

WATTS WATTS WATTS WATTS

6400

6600

6800

7000

7200

7400

7600

7800

8000

8200

8400

8600

8800

9000

9200

9400

9600

720

736

752

768

784

801

817

833

849

865

881

915

924

933

942

951

960

2611

2855

3098

3342

3585

3829

4072

4316

4559

4802

5046

5600

5905

6211

6516

6821

7127

740

756

772

788

804

820

836

852

868

910

919

928

936

945

954

963

972

2755

2998

3242

3485

3729

3972

4216

4459

4703

5169

5474

5779

6084

6390

6695

7000

7306

759

775

791

807

823

839

855

871

913

922

931

940

949

958

967

976

985

2899

3142

3385

3629

3872

4116

4359

4603

5042

5348

5653

5958

6264

6569

6874

7180

—

779

795

811

827

843

859

875

917

926

935

944

953

962

971

980

989

—

3042

3286

3529

3772

4016

4259

4503

4916

5221

5527

5832

6137

6443

6748

7053

7359

—

798

814

830

846

862

878

921

930

939

948

957

966

975

984

993

—

—

3186

3429

3673

3916

4160

4403

4790

5095

5401

5706

6011

6317

6622

6927

7233

—

—

817

834

850

866

882

925

934

943

952

961

970

979

988

997

1006

—

—

3329

3573

3816

4060

4303

4664

4696

5274

5580

5885

6190

6496

6801

7106

7412

—

—

837

853

869

920

929

938

947

956

965

974

983

992

1001

1010

———

3473

3716

3960

4232

4538

4843

5148

5454

5759

6064

6369

6675

6980

7285

———

856

872

924

933

942

951

960

969

978

987

996

1005

1014

———

—

3616

3860

4106

4411

4717

5022

5327

5633

5938

6243

6549

6854

7159

———

—

876

928

937

946

955

964

973

982

991

1000

1009

1018

1027

———

—

3760

3980

4285

4591

4896

5201

5506

5812

6117

6422

6728

7033

7338

———

—

932

941

950

959

968

977

986

995

1004

1013

1022

1031

—————

3854

4159

4464

4770

5075

5380

5686

5991

6296

6602

6907

7212

—————

945

954

963

972

981

990

999

1008

1017

1026

1035

1044

—————

4033

4338

4643

4949

5254

5559

5865

6170

6475

6781

7086

7391

—————

958

967

976

985

994

1003

1012

1021

1030

1039

1048

—————

—

4212

4517

4823

5128

5433

5739

6044

6349

6655

6960

7265

—————

—

971

980

989

998

1007

1015

1024

1033

1042

1051

———————

4391

4696

5002

5307

5612

5918

6223

6528

6834

7139

———————

983

992

1001

1010

1019

1028

1037

1046

1055

1064

———————

4570

4876

5181

5486

5791

6097

6402

6707

7013

7318

———————

996

1005

1014

1023

1032

1041

1050

1059

1068

———————

—

4749

5055

5360

5665

5971

6276

6581

6887

7192

———————

—

1009

1018

1027

1036

1045

1054

1063

1072

1081

———————

—

1022

1031

1040

1049

1058

1067

1076

1085

—————————

1035

1044

1053

1062

1071

1080

1089

1098

—————————

1048

1057

1066

1075

1084

1093

1102

—————————

—

4928

5234

5539

5844

6150

6455

6760

7066

7371

———————

—

5108

5413

5718

6024

6329

6634

6940

7245

—————————

5287

5592

5897

6203

6508

6813

7119

7424

—————————

5466

5771

6076

6382

6687

6992

7298

—————————

—

DRIVE PACKAGE L

5.0
BK-95

1VP-50

1 2 3 456

882 846 810 773 736 700

MOTOR HP

BLOWER SHEAVE

MOTOR SHEAVE

TURNS OPEN

RPM

NOTES: 1. Factory sheave settings shown in bold type.

2. Do not set sheave below minimum turns open shown.

3. Re-adjustment of sheave required to achieve rated airflow at ARI minimum E.S.P.

4. Drive data shown is for horizontal airflow with dry coil. Add component resistance

to duct resistance to determine total E.S.P.

DRIVE PACKAGE M

7.5
BK-90

1VP-60

123

4

56

1102 1075 1047

1006

964 922

MOTOR HP

BLOWER SHEAVE

MOTOR SHEAVE

TURNS OPEN

RPM

COMPONENT RESISTANCE TABLE

CFM WET COIL DOWNFLOW

6400 0.100 0.030

6800 0.125 0.043

7200 0.150 0.055

7600 0.175 0.068

8000 0.200 0.080

8400 0.225 0.093

8800 0.250 0.105

9200 0.275 0.118

9600 0.300 0.130

IM 863

29

ELECTRICAL DATA

Minimum Circuit Ampacity

Minimum Overcurrent
Protection Device Size

34

40

Maximum Overcurrent
Protection Device Size

40

Compressor Motor

No.

4

Volts

575

Phase

3

HP

3 1/2

RPM

3450

Amps (RLA)

5

Amps (LRA)

Unit Information

Unit Operating
Voltage Range

34

518-632

Condenser Motor

No.

4

Volts

575

Phase

1

HP

1/3

Amps (FLA)

4

Amps (LRA)

1.5

Evaporator Fan

No.

1

Volts

575

Phase

3

HP

3

Amps (FLA)

8

Amps (LRA)

20 33

8

5

3

575

1

1.5

4

1/3

1

575

4

34

5

3450

3 1/2

3

575

4

40

40

34

518-632

82.6

14.7

5

3

208/230

1

4.7

9.6

1/3

1

208/230

4

123/123

17.5/17.5

3450

4 3/4

3

200/230

4

110/110

110/110

99/99

187-253

82.6

14.7

5

3

208/230

1

4.7

9.6

1/3

1

208/230

4

123/123

17.5/17.5

3450

4 3/4

3

200/230

4

110/110

110/110

99/99

187-253

136

22.3

7.5

3

208/230

1

4.7

9.6

1/3

1

208/230

4

123/123

17.5/17.5

3450

4 3/4

3

200/230

4

125/125

125/125

108/108

187-253

136

22.3

7.5

3

208/230

1

4.7

9.6

1/3

1

208/230

4

123/123

17.5/17.5

3450

4 3/4

3

200/230

4

125/125

125/125

108/108

187-253

41.3

10

5

3

460

1

2.4

8

1/3

1

460

4

62

9

3450

4 3/4

3

460

4

60

60

57

414-506

41.3

10

5

3

460

1

2.4

8

1/3

1

460

4

62

9

3450

4 3/4

3

460

4

60

60

57

414-506

Model MPS-

015AGYL35E 015AGYM35E 020AGCL30E 020AGCL40E 020GCM30E 020GCM40E A020AGDL30E A020AGDL40E

1. Horsepower Per Compressor.

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

ELECTRICAL DATA

ELECTRICAL DATA

Minimum Circuit Ampacity

Minimum Overcurrent

Protection Device Size

74/74

80/80

Maximum Overcurrent
Protection Device Size

80/80

Compressor Motor

No.

4

Volts

200/230

Phase

3

HP

3 1/3

RPM

3450

Amps (RLA)

12.4/12.4

Amps (LRA)

Unit Information

Unit Operating
Voltage Range

88/88

187-253

Condenser Motor

No.

4

Volts

208/230

Phase

1

HP

1/3

Amps (FLA)

9.6

Amps (LRA)

4.7

Evaporator Fan

No.

1

Volts

208/230

Phase

3

HP

3

Amps (FLA)

11.5

Amps (LRA)

74.5 74.5

11.5

3

3

208/230

1

4.7

9.6

1/3

1

208/230

4

88/88

12.4/12.4

3450

3 1/3

3

200/230

4

80/80

80/80

74/74

187-253

82.6

14.7

5

3

208/230

1

4.7

9.6

1/3

1

208/230

4

88/88

12.4/12.4

3450

3 1/3

3

200/230

4

90/90

90/90

78/78

187-253

82.6

14.7

5

3

208/230

1

4.7

9.6

1/3

1

208/230

4

88/88

12.4/12.4

3450

3 1/3

3

200/230

4

80/80

80/80

77/77

187-253

38.1

7

3

3

460

1

2.4

8

1/3

1

460

4

44

6.4

3450

3 1/2

3

460

4

45

45

43

414-506

38.1

7

3

3

460

1

2.4

8

1/3

1

460

4

44

6.4

3450

3 1/2

3

460

4

45

45

43

414-506

41.3

10

5

3

460

1

2.4

8

1/3

1

460

4

44

6.4

3450

3 1/2

3

460

4

50

50

47

414-506

41.3

10

5

3

460

1

2.4

8

1/3

1

460

4

44

6.4

3450

3 1/2

3

460

4

50

50

47

414-506

Model MPS-

015AGCL25E 015AGCL35E 015AGCM25E 015AGCM35E 015AGDL25E 015AGDL35E 015AGDM25E 015AGDM35E

1. Horsepower Per Compressor.

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

30 IM 863

ELECTRICAL DATA

ELECTRICAL DATA

Minimum Circuit Ampacity 58

Unit Information

Unit Operating
Voltage Range

414-506

Minimum Overcurrent
Protection Device Size

60

Maximum Overcurrent

Protection Device Size

60

Compressor Motor

No. 4

Volts 460

Phase 3

HP

4 3/4

RPM 3450
Amps (RLA) 9
Amps (LRA) 62

Condenser Motor

No. 4

Volts 460

Phase 1

HP 1/3
Amps (FLA) 8
Amps (LRA) 2.4

Evaporator Fan

No. 1

Volts 460

Phase 3

HP 7.5
Amps (FLA) 11.2
Amps (LRA) 68 68

11.2

7.5

3

460

1

2.4

8

1/3

1

460

4

62

9

3450

4 3/4

3

460

4

60

60

58

414-506

33

8

5

3

575

1

1.5

4

1/3

1

575

4

50

7.1

3450

4

3

575

4

50

45

43

518-632

53.8

8.8

7.5

3

575

1

1.5

4

1/3

1

575

4

50

7.1

3450

4

3

575

4

50

50

44

518-632

Model MPS-

020AGDM30E 020AGDM40E 020AGYL40E 020AGYM40E

1. Horsepower Per Compressor.

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

IM 863

31

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.

• 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 pressure- • Restriction in liquid line, expansion device or filter drier • Remove or replace defective component
low vapor pressures • Flow check piston size too small • Change to correct size piston

• Incorrect capillary tubes • Change coil assembly

High head pressure-high or • Dirty condenser coil • Clean coil

normal vapor pressure - • Refrigerant overcharge • Correct system charge

Cooling mode • Condenser fan not running • Repair or replace

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

Low head pressure-high vapor • Defective Compressor valves • Replace compressor

pressures • Incorrect capillary tubes • Replace coil assembly

Low vapor pressure - • Low evaporator airflow • Increase speed of blower or reduce restriction - replace air

cool compressor - filter

iced evaporator coil • 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

Figure 25

Cooling Trouble Shooting Chart

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

!

32 IM 863

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

30 SECOND PREPURGE

REPLACE INTEGRATED
CONTROL BOARD (IFC)

REPLACE INDUCED

DRAFT BLOWER(S)

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 IFC

• CHECK LOW VOLTAGE TRANSFORMER

• CHECK WIRING

• CHECK FOR 208-230 VAC TO IDM MOTOR

• CHECK IGNITOR CABLE

• CHECK SPARK IGNITOR POSITION AND CONDITION

• IS EACH NEGATIVE PRESSURE SWITCH CLOSED?

• CHECK FOR OPEN ROLL-OUT CONTROLS

• 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. THE SYSTEM WILL ATTEMPT TO LIGHT 3 TIMES EACH HOUR
UNTIL THE BURNERS LIGHT OR THE THERMOSTAT IS RESET OR POWER IS
REMOVED FOR 3 SECONDS OR GREATER.

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

HAZARDOUS VOLTAGE

LINE VOLTAGE CON-

NECTIONS

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

▲▲

WARNING

!

IM 863

33

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 FOR LINE VOLTAGE AT LOAD SIDE OF
BLOWER CONTACT.

YES

YES

NO

MAIN BURNER FLAME SUSTAINED

YES

NO

INDOOR BLOWER MOTOR STARTS

AFTER 45 SECONDS

REPLACE SENSOR

NO

REPLACE INTEGRATED
CONTROL BOARD (IFC)

NO

REPLACE IGNITION CON-

TROL

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

YES

NO

SYSTEM RUNS UNTIL

CALL FOR HEAT ENDS

TROUBLESHOOTING ENDS

REPEAT PROCEDURE UNTIL TROUBLE FREE

OPERATION IS OBTAINED.

YES

NO

TURN THERMOSTAT OFF

VALVE SHUTS OFF

FLAME SHUTS OFF

YES

INDUCED DRAFT MOTOR(S) 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

INDOOR BLOWER MOTOR STOPS

AFTER 90 SECONDS

YES

FURNACE STARTS ON HIGH FIRE.
FURNACE SWITCHES TO LOW FIRE
AFTER 120 SECONDS WARMUP IF
THERMOSTAT IS CALLING FOR W1.
FURNACE WILL SWITCH TO HIGH
FIRE IF LOW FIRE DOES NOT SATIS­FY THERMOSTAT DEMAND FOR HEAT
LOAD.

34 IM 863

Figure 27

WIRING DIAGRAM

208-230, 3 PH, 60 HZ.

VOLTAGES

ROOFTOP

IM 863

35

Figure 28

WIRING SCHEMATIC

208 - 230, 3 PH, 60 HZ.

ROOFTOP

36 IM 863

Figure 29

WIRING DIAGRAM

460V, 3 PH, 60 HZ.

IM 863

37

Figure 30

WIRING SCHEMATIC

460V, 3 PH, 60 HZ.

38 IM 863

Figure 31

IM 863

39

Figure 32

40 IM 863

Figure 33

IM 863

41

Figure 34

42 IM 863

IM 863

43

44 IM 863

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.