Unitary products group GY8SUH, GM8SUH, GR8SUH, LY8SUH, LM8S*UH Installation Manual

...

EFFICIE NCY RATING CERTIFIE D

ISO 9001

Certified Quality

Management System

HIGH EFFICIENCY

INSTALLATION MANUAL

INSTALLATION MANUALINSTALLATION MANUAL

INSTALLATION MANUAL

TUBULAR HEAT EXCHANGER SERIES

MODELS: GY8S*UH / GM8S*UH / GR8S*UH / LY8S*UH / LM8S*UH / LF8*UH

(Single Stage Upflow / Horizontal / Low NOx)

40 - 130 MBH INPUT (11.72 - 38.10 KW) INPUT

LIST OF SECTIONS

SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LIST OF FIGURES

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . . 7

Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Gas Valve - All Except GR Models . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Gas Valve - GR Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Upflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Horizontal Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Thermostat Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Typical Twinned Furnace Application . . . . . . . . . . . . . . . . . . . . . . . . 12

Single Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . 13

Two-Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 13

Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Typical Sidewall Vent Application . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

VENT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .20

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAFETY 1

Typical Sidewall Vent and Termination Configuration . . . . . . . . . . . .15

Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Combustion Airflow Path Through The Furnace

Casing to the Burner Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Alternate Air Intake, Air Outlet and Chimney Connections . . . . . . . . .17

Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . . . . . . . . . . .17

Typical Chimney Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Horizontal Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . .18

Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . .18

Pressure Switch Tubing Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Gas Valve - GR Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Typical Heat/Cool Speed Tap Connections . . . . . . . . . . . . . . . . . . . .24

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

LIST OF TABLES

Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Minimum Duct Sizing For Proper Airflow . . . . . . . . . . . . . . . . . . . . . . . 4

Round Duct Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Filter Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Nominal Manifold Pressure - High Fire . . . . . . . . . . . . . . . . . . . . . . . . 9

Ratings & Physical / Electrical Data - Upflow Models . . . . . . . . . . . . . 9

Roof Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

SECTION I: SAFETY

SECTION I: SAFETYSECTION I: SAFETY

This is a safety alert symbol. When you see this symbol on labels or in manuals, be alert to the potential for personal injury.

Understand and pay particular attention to the signal words DANGER,

WARNING, or CAUTION.

DANGER indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation, which, if not

avoided may result in minor or moderate injury. It is also used to alert against unsafe practices and hazards involving only property damage.

Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . . . . .18

Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Nominal Manifold Pressure - All Except GR Models . . . . . . . . . . . . .22

Nominal Manifold Pressure - GR Models . . . . . . . . . . . . . . . . . . . . . .23

Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .24

Field Installed Accessories - Non Electrical . . . . . . . . . . . . . . . . . . . .25

Blower Performance CFM - Upflow/Horizontal (without filter) -

Bottom Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Blower Performance CFM - Upflow/Horizontal (without filter) -

Left Side Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Improper installation may create a condition where the operation of the product could cause personal injury or property damage.

Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual for assistance or for additional information, consult a qualified contractor, installer or service agency.

This product must be installed in strict compliance with the installation instructions and any applicable local, state, and national codes including, but not limited to building, electrical, and mechanical codes.

166753-UIM-C-0706

SPECIFIC SAFETY RULES AND PRECAUTIONS

SPECIFIC SAFETY RULES AND PRECAUTIONSSPECIFIC SAFETY RULES AND PRECAUTIONS

1. Only Natural gas or Propane (LP) gas are approved for use with this furnace.

2. Install this furnace only in a location and position as specified in SECTION I of these instructions.

3. A gas-fired furnace for installation in a residential garage must be installed as specified in SECTION I of these instructions.

4. Provide adequate combustion and ventilation air to the furnace space as specified in SECTION VII of these instructions.

5. Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified in SECTION VII of these instructions.

FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury, death or property damage. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

6. Test for gas leaks as specified in SECTION IX of these instructions.

7. Always install the furnace to operate within the furnace’s intended temperature-rise range. Only connect the furnace to a duct system which has an external static pressure within the allowable range, as specified on the furnace rating plate.

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

9. The furnace is not to be used for temporary heating of buildings or structures under construction.

10. When installed in a Non-HUD-Approved Modular Home or building constructed on-site, combustion air shall not be supplied from occupied spaces.

11. The size of the unit should be based on an acceptable heat loss calculation for the structure. ACCA, Manual J or other approved methods may be used.

SAFETY REQUIREMENTS

SAFETY REQUIREMENTSSAFETY REQUIREMENTS

• This furnace should be installed in accordance with all national and local building/safety codes and requirements, local plumbing or wastewater codes, and other applicable codes. In the absence of local codes, install in accordance with the National Fuel Gas Code ANSI Z223.1/NFPA 54, National Fuel Gas Code, and/or CAN/CGA B149.1 Natural Gas and Propane Installation Code (latest editions). Furnaces have been certified to the latest edition of standard ANSI Z21-47 • CSA 2.3.

• Refer to the unit rating plate for the furnace model number, and then see the dimensions page of this instruction for return air plenum dimensions in Figure 1. The plenum must be installed according to the instructions.

• Provide clearances from combustible materials as listed under Clearances to Combustibles.

• Provide clearances for servicing ensuring that service access is allowed for both the burners and blower.

• These models ARE NOT CSA listed or approved for installation into a HUD Approved Modular Home or a Manufactured (Mobile) Home.

• This furnace is not approved for installation in trailers or recreational vehicles.

• Failure to carefully read and follow all instructions in this manual can result in furnace malfunction, death, personal injury and/or property damage.

• Furnaces for installation on combustible flooring shall not be installed directly on carpeting, tile or other combustible material other than wood flooring.

• Check the rating plate and power supply to be sure that the electrical characteristics match. All models use nominal 115 VAC, 1 Phase, 60-Hertz power supply. DO NOT CONNECT THIS APPLIANCE TO A 50 HZ POWER SUPPLY OR A VOLTAGE ABOVE 130 VOLTS.

• Furnace shall be installed so the electrical components are protected from water.

• Installing and servicing heating equipment can be hazardous due to the electrical components and the gas fired components. Only trained and qualified personnel should install, repair, or service gas heating equipment. Untrained service personnel can perform basic maintenance functions such as cleaning and replacing the air filters. When working on heating equipment, observe precautions in the manuals and on the labels attached to the unit and other safety precautions that may apply.

• These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances these instructions exceed certain local codes and ordinances, especially those who have not kept up with changing residential and non-HUD modular home construction practices. These instructions are required as a minimum for a safe installation.

COMBUSTION AIR QUALITY

COMBUSTION AIR QUALITY COMBUSTION AIR QUALITY (LIST OF CONTAMINANTS)

(LIST OF CONTAMINANTS)

(LIST OF CONTAMINANTS)(LIST OF CONTAMINANTS)

The furnace will require OUTDOOR AIR for combustion when the furnace is located in any of the following environments.

• Restricted Environments

• Commercial buildings

• Buildings with indoor pools

• Furnaces installed in laundry rooms

• Furnaces installed in hobby or craft rooms

• Furnaces installed near chemical storage areas

• Chemical Exposure

The furnace will require OUTDOOR AIR for combustion when the furnace is located in an area where the furnace is being exposed to the following substances and / or chemicals.

• Permanent wave solutions

• Chlorinated waxes and cleaners

• Chlorine based swimming pool chemicals

• Water softening chemicals

• De-icing salts or chemicals

• Carbon tetrachloride

• Halogen type refrigerants

• Cleaning solvents (such as perchloroethylene)

• Printing inks, paint removers, varnishes, etc.

• Hydrochloric acid

• Cements and glues

• Antistatic fabric softeners for clothes dryers

• Masonry acid washing materials

When outdoor air is used for combustion, the combustion air intake duct system termination must be located external to the building and in an area where there will be no exposure to the substances listed above.

The furnace area must not be used as a broom closet or for any other storage purposes, as a fire hazard may be created. Never store items such as the following on, near or in contact with the furnace.

1. Spray or aerosol cans, rags, brooms, dust mops, vacuum cleaners or other cleaning tools.

2. Soap powders, bleaches, waxes or other cleaning compounds; plastic items or containers; gasoline, kerosene, cigarette lighter fluid, dry cleaning fluids or other volatile fluid.

3. Paint thinners and other painting compounds.

4. Paper bags, boxes or other paper products

Never operate the furnace with the blower door removed. To do so could result in serious personal injury and/or equipment damage.

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INSPECTION

INSPECTIONINSPECTION

As soon as a unit is received, it should be inspected for possible damage during transit. If damage is evident, the extent of the damage should be noted on the carrier’s freight bill. A separate request for inspection by the carrier’s agent should be made in writing. Also, before installation the unit should be checked for screws or bolts, which may have loosened in transit. There are no shipping or spacer brackets which need to be removed.

FURNACE LOCATION AND CLEARANCES

FURNACE LOCATION AND CLEARANCESFURNACE LOCATION AND CLEARANCES

The furnace shall be located using the following guidelines:

1. Where a minimum amount of air intake/vent piping and elbows will be required.

2. As centralized with the air distribution as possible.

3. Where adequate combustion air will be available (particularly when the appliance is not using outdoor combustion air).

4. Where it will not interfere with proper air circulation in the confined space.

5. Where the outdoor vent terminal will not be blocked or restricted. Refer to “VENT CLEARANCES” located in SECTION VII of these instructions. These minimum clearances must be maintained in the installation.

6. Where the unit will be installed in a level position with no more than 1/4” (6.4 mm) slope side-to-side and front-to-back to provide proper condensate drainage.

Installation in freezing temperatures:

1. Furnace shall be installed in an area where ventilation facilities provide for safe limits of ambient temperature under normal operating conditions. Ambient temperatures may fall below 32° F (0° C) providing the flue temperature does not fall below 260° F (127° C) at any point in the flue pipe between the furnace and the chimney or a B-Vent. The flue products will condense in the vent pipe if the flue temperature falls below 260° F (127° C) causing the vent pipe to deteriorate rapidly.

2. Do not allow return air temperature to be below 55º F (13° C) for extended periods. To do so may cause condensation to occur in the main heat exchanger, leading to premature heat exchanger failure.

Improper installation in an ambient below 32ºF (0.0° C) could create a hazard, resulting in damage, injury or death.

3. If this furnace is installed in an unconditioned space and an extended power failure occurs, there will be potential damage to the internal components. Following a power failure situation, do not operate the unit until inspection and repairs are performed.

Clearances for access:

Ample clearances should be provided to permit easy access to the unit. The following minimum clearances are recommended:

1. Twenty-four (24) inches (61 cm) between the front of the furnace and an adjacent wall or another appliance, when access is required for servicing and cleaning.

2. Eighteen (18) inches (46 cm) at the side where access is required for passage to the front when servicing or for inspection or replacement of flue/vent connections.

In all cases, accessibility clearances shall take precedence over clearances for combustible materials where accessibility clearances are greater.

Installation in a residential garage:

A gas-fired furnace for installation in a residential garage must be installed so the burner(s) and the ignition source are located not less than 18 inches (46 cm) above the floor, and the furnace must be located or protected to avoid physical damage by vehicles.

TABLE 1:

1. Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the furnace jacket and building

SECTION II: DUCTWORK

SECTION II: DUCTWORKSECTION II: DUCTWORK

DUCTWORK GENERAL INFORMATION

DUCTWORK GENERAL INFORMATIONDUCTWORK GENERAL INFORMATION

The duct system’s design and installation must:

1. Handle an air volume appropriate for the served space and within

2. Be installed in accordance with standards of NFPA (National Fire

3. Create a closed duct system. For residential and Non-HUD Modu-

Unit Clearances to Combustibles (All Dimensions in Inches, and All Surfaces Identified with the Unit in an Upflow Configuration)

Application

Upflow 1 (25.4) 6 (15.24) 0 (0.0) 0 (0.0) 3 (7.62) 6 (15.24) Combustible Yes Yes Yes No

Upflow B-Vent 1 (25.4) 3 (7.62) 0 (0.0) 0 (0.0) 0 (0.0) 1 (25.4) Combustible Yes Yes Yes No

Horizontal 1 (25.4) 6 (15.24) 0 (0.0) 0 (0.0) 3 (7.62) 6 (15.24) Combustible No Yes Yes

Horizontal B-Vent 1 (25.4) 3 (7.62) 0 (0.0) 0 (0.0) 0 (0.0) 1 (25.4) Combustible No Yes Yes

joists, studs or framing.

the operating parameters of the furnace specifications.

Protection Association) as outlined in NFPA pamphlets 90A and 90B (latest editions) or applicable national, provincial, or state, and local fire and safety codes.

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

Top Front Rear Left Side Right Side Flue

In. (cm) In. (cm) In. (cm) In. (cm) In. (cm) In. (cm)

4. Complete a path for heated or cooled air to circulate through the air conditioning and heating equipment and to and from the conditioned space.

The cooling coil must be installed in the supply air duct, downstream of the furnace. Cooled air may not be passed over the heat exchanger.

When the furnace is used in conjunction with a cooling coil, the coil must be installed parallel with, or in the supply air side of the furnace to avoid condensation in the primary heat exchanger. When a parallel flow arrangement is used, dampers or other means used to control airflow must be adequate to prevent chilled air from entering the furnace. If manually operated, the damper must be equipped with means to prevent the furnace or the air conditioner from operating unless the damper is in full heat or cool position.

Floor/

Bottom

Closet Alcove Attic

Contact

Line

Yes

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The duct system must be properly sized to obtain the correct airflow for the furnace size that is being installed.

Refer to 7 and the furnace rating plate for the correct rise range and static pressures If the ducts are undersized, the result will be high duct static pressures and/or high temperature rises which can result in a heat exchanger OVERHEATING CONDITION. This condition can result in premature heat exchanger failure, which can result in personal injury, property damage, or death.

DUCTWORK INSTALLATION AND SUPPLY PLENUM

DUCTWORK INSTALLATION AND SUPPLY PLENUM DUCTWORK INSTALLATION AND SUPPLY PLENUM CONNECTION

CONNECTION

CONNECTIONCONNECTION

Attach the supply plenum to the furnace outlet duct connection flanges. This is typically through the use of S cleat material when a metal plenum is used. The use of an approved flexible duct connector is recommended on all installations. This connection should be sealed to prevent air leakage. The sheet metal should be crosshatched to eliminate any popping of the sheet metal when the indoor

fan is energized. When replacing an existing furnace, if the existing plenum is not the same size as the new furnace then the existing plenum must be removed and a new plenum installed that is the proper size for the new furnace. If the plenum is shorter than 12” (30.5 cm) the turbulent air flow may cause the limit controls not to operate as designed, or the limit controls may not operate at all.

The duct system is a very important part of the installation.

If the duct

system is improperly sized the furnace will not operate properly.

The ducts attached to the furnace plenum, should be of sufficient size so that the furnace operates at the specified external static pressure and within the air temperature rise specified on the nameplate.

Table 2 is a guide for determining whether the rectangular duct system that the furnace is being connected to be of sufficient size for proper furnace operation.

Use the Example below to help you in calculating the duct area to determine whether the ducts have sufficient area so that the furnace operates at the specified external static pressure and within the air temperature rise specified on the nameplate.

Ex. The furnace input is 80,000 BTUH and 1,200 CFM. The recommended duct area is 280 sq.in, there are two 8 x 14 rectangular ducts attached to the plenum and there are two 7 inch round ducts attached to the furnace.

1. Take 8 x 14, which equals 112 sq.in. X 2, which equals 224 square inch then go to round duct size located in Table 3.

2. The square inch area for 7 inch round pipe is 38.4, multiply by 2 for two round ducts which equals 76.8 square inch,

3. Then take the 224 square inch from the rectangular duct and add it to the 76.8 sq.in. of round duct. The total square inch of duct attached to the furnace plenum is 300.8 square inch. This exceeds the recommended 280 square inch of duct.

In this example, the duct system attached to the plenum has a sufficient area so that the furnace operates at the specified external static pressure and within the air temperature rise specified on the nameplate.

TABLE 2:

Minimum Duct Sizing For Proper Airflow

Input Airflow

Return

Rectangular

Round

Supply

BTU/H(kW) CFM(m³) In² (cm²) in. x in.(cm x cm) in. (cm) dia. In²(cm²)

40,000(11.7) 1,200(34.0) 280 (711) 14 x 20 (35.6 x 50.8) 18 (45.7) 216 (549)

60,000 (17.6) 1,200 (34.0) 280 (711) 14 x 20 (35.6 x 50.8) 18 (45.7) 216 (549)

80,000 (23.4) 1,200 (34.0) 280 (711) 14 x 20 (35.6 x 50.8) 18 (45.7) 216 (549)

80,000 (23.4) 1,600 (45.3) 360 (914) 18 x 20 (45.7 x 50.8) 22 (55.8) 280 (711)

80,000 (23.4)

2,000 (56.6) 2,200 (62.3)

440 (1,118) 20 x 22 (50.8 x 55.8) 24 (60.9) 390 (991)

100,000 (29.3) 1,200 (34.0) 320 (813) 16 x 20 (40.6 x 50.8) 20 (50.8) 336 (853)

100,000 (29.3) 1,600 (45.3) 360 (914) 18 x 20 (45.7 x 50.8) 22 (55.8) 280 (711)

100,000 (29.3) 2,000 (56.6) 440 (1,118) 20 x 22 (50.8 x 55.8) 24 (60.9) 390 (991)

115,000 (35.2) 1,600 (45.3) 360 (914) 18 x 20 (45.7 x 50.8) 22 (55.8) 280 (711)

115,000 (35.2) 2,000 (56.6) 440 (1,118) 20 x 22 (50.8 x 55.8) 24 (60.9) 390 (991)

130,000 (41.0) 2,000 (56.6) 440 (1,118) 20 x 22 (50.8 x 55.8) 24 (60.9) 390 (991)

NOTE: This chart does not replace proper duct sizing calculations or take into account static pressure drop for run length and fittings. Watch out for the temperature rise and static pressures.

1. Maximum return air velocity in rigid duct @ 700 feet per minute (19.82 m3 / minute).

2. Example return main trunk duct minimum dimensions.

3. Maximum supply air velocity in rigid duct @ 900 feet per minute (25.49 m3 / minute).

TABLE 3:

Round Duct Size

Round Duct Size Calculated Area For Each Round Duct Size

inches (cm)

Sq.in (cm2)

5 (13) 19.6 (126)

6 (15) 28.2 (182)

7 (18) 38.4 (248)

8 (20) 50.2 (324)

9 (23) 63.6 (410)

10 (25) 78.5 (506)

11 (28) 95 (613)

12 (30) 113.1 (730)

13 (33) 132.7 (856)

14 (36) 153.9 (993)

1. The Air Temperature Rise is determined by subtracting the Return Air Temperature Reading from the Supply Air Temperature Reading.

2. The External Static Pressure is determined by adding the Supply Duct Static Pressure reading to the Return Duct Static Pressure reading, adding the pressure across any applied a-coil and the drop across the return air filter.

TABLES 2 & 3 are to be used as a guide only to help the installer determine if the duct sizes are large enough to obtain the proper air flow (CFM) through the furnace. TABLES 2 & 3 ARE NOT to be used to design ductwork for the building where the furnace is being installed. There are several variables associated with proper duct sizing that are not included in the tables. To properly design the ductwork for the building, refer to the ASHRAE Fundamentals Handbook, Chapter on “DUCT DESIGN” or a company that specializes in Residential and Modular Home duct designs.

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FRONT

LEFT SIDE

RIGHT SIDE

28-1/2

3/4

14-3/4

5-3/8

(VENT CONNECTIONS)

POWERWIRING 7/8”HOLE

2-1/2

ACCESS WIRING 7/8”K.O.

8-3/4

T’STAT WIRING7/8”K.O.

1-1/8

2-1/4

23-1/2

32-1/2

13-3/4

GASINLET 1-1/4x2-1/2

26-1/2

1-3/8

1-1/4

5/8

24-3/4

BOTTOMIMAGE

RETURNEND

TOP IMAGE

SUPPLY END

4”Diameter

IMPORTANT:

The minimum plenum height is 12” (30.5 cm). The furnace will not operate properly on a shorter plenum height. The minimum recommended rectangular duct height is 4 inches (10 cm) attached to the plenum.

IMPORTANT:

The air temperature rise should be taken only after the furnace has been operating for at least 15 minutes. Temperatures and external static pressures should be taken 6” (15 cm) past the first bend from the furnace in the supply duct and the return duct. If an external filter box or an electronic air cleaner is installed, take the return air readings before the filter box or air cleaner.

If a matching cooling coil is used, it may be placed directly on the furnace outlet and sealed to prevent leakage. Follow the coil instructions for installing the supply plenum. On all installations without a coil, a removable access panel is recommended in the outlet duct such that smoke or reflected light would be observable inside the casing to indicate the presence of leaks in the heat exchanger. This access cover shall be attached in such a manner as to prevent leaks.

The supply air temperature MUST NEVER exceed the Maximum Supply Air Temperature, specified on the nameplate.

Operating the furnace above the maximum supply air temperature will cause the heat exchanger to overheat, causing premature heat exchanger failure. Improper duct sizing, dirty air filters, incorrect manifold pressure, incorrect gas orifice and/or a faulty limit switch can cause the furnace to operate above the maximum supply air temperature. Refer to sections II, III and IX for additional information on correcting the problem.

FIGURE 1:

TABLE 4:

Dimensions

Cabinet and Duct Dimensions

BTUH (kW)

Input/Output

CFM (m3/min)

40/32 (11.7/9.4) 1200 (34.0) A 14 1/2 36.8 13 1/4 33.6 11 1/2 29.1 10 1/8 25.7

60/48 (17.6/14.1) 1200 (34.0) A 14 1/2 36.8 13 1/4 33.6 11 1/2 29.1 10 1/8 25.7

80/64 (23.4/18.8) 1200 (34.0) A 14 1/2 36.8 13 1/4 33.6 11 1/2 29.1 10 1/8 25.7

80/64 (23.4/18.8) 1600 (45.3) B 17 1/2 44.4 16 1/4 41.3 14 3/8 36.5 11 5/8 29.5

80/64 (23.4/18.8) 1600 (45.3) C 2 53.3 19 3/4 50.2 17 3/4 45.1 13 3/8 34.0

80/64 (23.4/18.8)

2000 (56.6) 2200 (62.3)

100/80 (29.3/23.4) 1200 (34.0) B 17 1/2 44.4 16 1/4 41.3 14 3/8 36.5 11 5/8 29.5

100/80 (29.3/23.4) 1600 (45.3) B 17 1/2 44.4 16 1/4 41.3 14 3/8 36.5 11 5/8 29.5

100/80 (29.3/23.4) 1600 (45.3) C 21 53.3 19 3/4 50.2 17 3/4 45.1 13 3/8 34

100/80 (29.3/23.4) 2000 (56.6) C 21 53.3 19 3/4 50.2 17 3/4 45.1 13 3/8 34

115/92 (33.7/27.0) 1600 (45.3) C 21 53.3 19 3/4 50.2 17 3/4 45.1 13 3/8 34

115/92 (33.7/27.0) 2000 (56.6) C 21 53.3 19 3/4 50.2 17 3/4 45.1 13 3/8 34

130/104 (38.1/30.5) 2000 (56.6) D 24 1/2 62.2 23 1/4 59.1 21 3/8 54.3 15 1/8 27.6

Unitary Products Group 5

Cabinet

Size

C 21 53.3 19 3/4 50.2 17 3/4 45.1 13 3/8 34.0

A A (cm) B B (cm) C C (cm) D D (cm)

Cabinet Dimension

166753-UIM-C-0706

RETURN AIR

SEDIMENT

TRAP

GAS PIPING

SUPPLY AIR

VENT (Maintain required clearances to combustibles)

SHEET METAL IN FRONT OF FURNACE COMBUSTION AIR OPENINGS IS RECOMMENDED

LINE CONTACT ONLY PERMISSIBLE BETWEEN LINES FORMED BY THE INTERSECTION OF FURNACE TOP AND TWO SIDES AND BUILDING JOISTS, STUDS OR FRAMING

12”

30” MIN. WORK AREA

FILTER RACK MUST BE A MINIMUM DISTANCE OF 18” (45.7 cm) FROM THE FURNACE

RESIDENTIAL AND NON HUD MODULAR HOME

RESIDENTIAL AND NON HUD MODULAR HOME RESIDENTIAL AND NON HUD MODULAR HOME UPFLOW RETURN PLENUM CONNECTION

UPFLOW RETURN PLENUM CONNECTION

UPFLOW RETURN PLENUM CONNECTIONUPFLOW RETURN PLENUM CONNECTION

Return air may enter the furnace through the side(s) or bottom depending on the type of application. Return air may not be connected into the rear panel of the unit. In order to achieve the airflow indicated, it is recommended those applications over 1800 CFM (57 m³/min) use return air from two sides, one side and the bottom or bottom only. For single return application, see data and notes on blower performance data tables in this manual.

BOTTOM RETURN AND ATTIC INSTALLATIONS

BOTTOM RETURN AND ATTIC INSTALLATIONSBOTTOM RETURN AND ATTIC INSTALLATIONS

Bottom return applications normally pull return air through a base platform or return air plenum. Be sure the return platform structure or return air plenum is suitable to support the weight of the furnace. The furnace base is equipped with a rectangular panel that can be removed by performing the following steps:

1. Lay the furnace on its back.

2. Remove the screws from the toe plate.

3. Remove the toe plate.

4. Pull the base plate out of the furnace base.

5. Reinstall the toe plate and secure with the screws that were removed.

Attic installations must meet all minimum clearances to combustibles and have floor support with required service accessibility.

IMPORTANT:

If an external mounted filter rack is being used see the

instructions provided with that accessory for proper hole cut size.

HORIZONTAL

HORIZONTAL MODELS

HORIZONTALHORIZONTAL

MODELS

MODELS MODELS

Horizontal Installations With a Cooling Coil Cabinet

The furnace should be installed with coil cabinet part number specifically intended for Horizontal application. If a matching cooling coil is used, it may be placed directly on the furnace outlet and sealed to prevent leakage. Follow the coil instructions for installing the supply plenum. For details of the coil cabinet dimensions and installation requirements, refer to the installation instructions supplied with the coil cabinet Attach the supply plenum to the air conditioning coil cabinet outlet duct flanges through the use of S cleat material when a metal plenum is used. The use of an approved flexible duct connector is recommended on all installations. The connection to the furnace, air conditioning coil cabinet and the supply plenum should be sealed to prevent air leakage. The sheet metal should be crosshatched to eliminate any popping of the sheet metal when the indoor fan is energized. The minimum plenum height is 12” (30.5 cm). If the plenum is shorter than 12” (30.5 cm) the turbulent air flow may cause the limit controls not to operate as designed, or the limit controls may not operate at all. Also the plastic drain pan in the air conditioning coil can overheat and melt. Refer to the installation instructions supplied with the air conditioning coil for additional information.

Horizontal Installations Without a Cooling Coil Cabinet

When installing this appliance, the furnace must be installed so as to create a closed duct system, the supply duct system must be connected to the furnace outlet and the supply duct system must terminate outside the space containing the furnace. When replacing an existing furnace, if the existing plenum is not the same size as the new furnace then the existing plenum must be removed and a new plenum installed that is the proper size for the new furnace. Attach the supply plenum to the furnace outlet duct flanges through the use of S cleat material when a metal plenum is used. The use of an approved flexible duct connector is recommended on all installations. This connection should be sealed to prevent air leakage. The sheet metal should be crosshatched to eliminate any popping of the sheet metal when the indoor fan is energized. On all installations without a coil, a removable access panel is recommended in the outlet duct such that smoke or reflected light would be observable inside the casing to indicate the presence of leaks in the heat exchanger. This access cover shall be attached in such a manner as to prevent leaks.

Residential and Non Hud Modular Home Horizontal Return Plenum Connections

The return duct system must be connected to the furnace inlet and the return duct system must terminate outside the space containing the furnace. When replacing an existing furnace, if the existing plenum is not the same size as the new furnace then the existing plenum must be removed and a new plenum installed that is the proper size for the new furnace. Attach the return plenum to the furnace inlet duct flanges. This is typically through the use of S cleat material when a metal plenum is used. The use of an approved flexible duct connector is recommended on all installations. The connection of the plenum to the furnace and all the ducts connecting to the plenum must be sealed to prevent air leakage. The sheet metal should be crosshatched to eliminate any popping of the sheet metal when the indoor fan is energized. The duct system is a very important part of the installation. If the duct system is improperly sized the furnace will not operate properly. The ducts attached to the furnace must be of sufficient size so that the furnace operates at the specified external static pressure and within the air temperature rise specified on the nameplate. Attic installations must meet all minimum clearances to combustibles and have floor support with required service accessibility.

IMPORTANT:

instructions provided with that accessory for proper hole cut size.

ATTIC INSTALLATION

ATTIC INSTALLATIONATTIC INSTALLATION

if an external mounted filter rack is being used see the

6 Unitary Products Group

FIGURE 2:

Typical Attic Installation

This appliance is design certified for line contact when the furnace is

1” MAX. BETWEEN ROD & FURNACE

SUPPORT ROD

6” MIN BETWEEN ROD & FURNACE

1” MAX. BETWEEN ROD & FURNACE

ANGLE IRON BRACKET

FRONT OF FURNACE

CORNER MARKINGS

installed in the horizontal left or right position. The line contact is only permissible between lines that are formed by the intersection of the top and two sides of the furnace and the building joists, studs or framing. This line may be in contact with combustible material. Refer to Figure 3.

When a furnace is installed in an attic or other insulated space, keep all insulating materials at least 12 inches (30.5 cm) away from furnace and burner combustion air openings.

SUSPENDED FURNACE / CRAWL SPACE

SUSPENDED FURNACE / CRAWL SPACE SUSPENDED FURNACE / CRAWL SPACE INSTALLATION

INSTALLATION

INSTALLATIONINSTALLATION

The furnace can be hung from floor joists or installed on suitable blocks or pad. Blocks or pad installations shall provide adequate height to ensure the unit will not be subject to water damage. Units may also be suspended from rafters or floor joists using rods, pipe angle supports or straps. Angle supports should be placed at the supply air end and near the blower deck. Do not support at return air end of unit. All four suspension points must be level to ensure quite furnace operation. When suspending the furnace use a secure platform constructed of plywood or other building material secured to the floor joists. Refer to Figure 4 for typical crawl space installation.

166753-UIM-C-0706

FIGURE 3:

In any application where temperatures below freezing are possible, see “BELOW FREEZING LOCATIONS”.

SECTION III: FILTERS

SECTION III: FILTERSSECTION III: FILTERS

FILTER INSTALLATION

FILTER INSTALLATIONFILTER INSTALLATION

All applications require the use of a field installed accessory filter. All filters and mounting provision must be field supplied. Refer to Tables 5 & 16 for accessory external filter kit options.

Typical Suspended Furnace / Crawl Space Installation

TABLE 5:

Filter Sizes

CFM

(m³/min)

Cabinet

Size

Side

(in)

Side

(cm)

Bottom

(in)

1200 (33.98) A 16 x 25 40.6 x 63.5 14 x 25 35.6 x 63.5 1200 (33.98) B 16 x 25 40.6 x 63.5 16 x 25 40.6 x 63.5 1600 (45.31) B 16 x 25 40.6 x 63.5 16 x 25 40.6 x 63.5 1600 (45.31) C 16 x 25 40.6 x 63.5 20 x 25 50.8 x 63.5 2000 (56.63) C (2) 16 x 25 (2) 40.6 x 63.5 20 x 25 50.8 x 63.5 2200 (62.30) C (2) 16 x 25 (2) 40.6 x 63.5 20 x 25 50.8 x 63.5 2000 (56.63) D (2) 16 x 25 (2) 40.6 x 63.5 22 x 25 55.9 x 63.5

NOTES:

1. Air velocity through throwaway type filters may not exceed 300 feet per minute (91.4 m/min). All velocities over this require the use of high velocity filters.

2. Air flows above 1800 CFM require either return from two sides or one side plus bottom.

SIDE RETURN - EXTERNAL INSTALLATION

SIDE RETURN - EXTERNAL INSTALLATIONSIDE RETURN - EXTERNAL INSTALLATION

Locate and knock out the square corner locators. These indicate the size of the cutout to be made in the furnace side panel. Refer to Figure 5.

HORIZONTAL APPLICATION

HORIZONTAL APPLICATIONHORIZONTAL APPLICATION

Horizontal Filters

All filters and mounting provision must be field supplied. Filters(s) may be located in the duct system external to the furnace or in a return filter grille(s). Filters(s) may be located in the duct system using an external duct filter box attached to the furnace plenum. Any branch duct (rectangular or round duct) attached to the plenum must attach to the vertical plenum above the filter height. The use of straps and / or supports is required to support the weight of the external filter box.

FIGURE 4:

Side Return Cutout Markings

IMPORTANT:

exceed 300 feet per minute (1.52 m/m). All velocities over this require the use of high velocity filters. Refer to Table 15.

Air velocity through throwaway type filters must not

Install the side filter rack following the instructions provided with that accessory. If a filter(s) is provided at another location in the return air system, the ductwork may be directly attached to the furnace side panel. An accessory filter rack is available for mounting the filter exter-

All installations must have a filter installed.

nal to the cabinet.

IMPORTANT:

Some accessories such as electronic air cleaners and pleated media may require a larger side opening. Follow the instructions supplied with that accessory for side opening requirements. Do not cut the opening larger than the dimensions shown in Figure 1.

Bottom

(cm)

Unitary Products Group 7

166753-UIM-C-0706

INLET

WRENCH BOSS

INLET PRESSURE PORT

OFF

ON/OFF SWITCH (Shown in ON position)

MAIN REGULATOR ADJUSTMENT

OUTLET

OUTLET PRESSURE PORT

VENT PORT

INLET

WRENCH BOSS

ON/OFF SWITCH (shown in OFF position)

MAIN REGULATOR ADJUSTMENT

OUTLET

SUPPLY PRESSURE TAP

OUTLET (MANIFOLD) PRESSURE TAP

ELECTRICAL CONNECTIONS

EXTERNAL MANUAL SHUTOFF VALVE

TO GAS SUPPLY

GROUNDED JOINT UNION MAY BE INSTALLED INSIDE OR OUTSIDE UNIT.

DRIP LEG

MANUAL SHUT-OFF VALVE

GAS PIPE

DRIP LEG

MANUAL SHUT-OFF VALVE

GAS VALVE

GAS BURNERS

DRIP LEG

SECTION IV: GAS PIPING

SECTION IV: GAS PIPINGSECTION IV: GAS PIPING

GAS SAFETY

GAS SAFETYGAS SAFETY

An overpressure protection device, such as a pressure regulator, must be installed in the gas piping system upstream of the furnace and must act to limit the downstream pressure to the gas valve so it does not exceed 0.5 PSI (14" w.c. (3.48 kPa). Pressures exceeding

0.5 PSI (14” w.c. (3.48 kPa) at the gas valve will cause damage to the gas valve, resulting in a fire or explosion or cause damage to the furnace or some of its components that will result in property damage and loss of life.

FIGURE 8:

IMPORTANT:

Horizontal Gas Piping

An accessible manual shutoff valve must be installed upstream of the furnace gas controls and within 6 feet (1.8 m) of the furnace.

The furnace must be isolated from the gas supply piping system by closing its individual external manual shutoff valve during any pressure testing of the gas supply piping system at pressures equal to or less than 1/2 psig (3.5 kPa).

FIGURE 5:

FIGURE 6:

IMPORTANT:

Gas Valve - All Except GR Models

Gas Valve - GR Models Only

Plan your gas supply before determining the correct gas pipe entry. Use 90-degree service elbow(s), or short nipples and conventional 90-degree elbow(s) to enter through the cabinet access holes.

GAS PIPING INSTALLATION

GAS PIPING INSTALLATIONGAS PIPING INSTALLATION

Properly sized wrought iron, approved flexible or steel pipe must be used when making gas connections to the unit. If local codes allow the use of a flexible gas appliance connection, always use a new listed connector. Do not use a connector that has previously serviced another gas appliance. Some utility companies or local codes require pipe sizes larger than the minimum sizes listed in these instructions and in the codes. The furnace rating plate and the instructions in this section specify the type of gas approved for this furnace - only use those approved gases. The installation of a drip leg and ground union is required. Refer to Figure 8.

FIGURE 7:

8 Unitary Products Group

Upflow Gas Piping

The gas valve body is a very thin casting that cannot take any external pressure. Never apply a pipe wrench to the body of the gas valve when installing piping. A wrench must be placed on the octagon hub located on the gas inlet side of the valve. Placing a wrench to the body of the gas valve will damage the valve causing improper operation and/or the valve to leak.

Gas piping may be connected from either side of the furnace using any of the gas pipe entry knockouts on both sides of the furnace. Refer to Figure 1 dimensions.

GAS ORIFICE CONVERSION FOR PROPANE (LP)

GAS ORIFICE CONVERSION FOR PROPANE (LP)GAS ORIFICE CONVERSION FOR PROPANE (LP)

This furnace is constructed at the factory for natural gas-fired operation, but may be converted to operate on propane (LP) gas by using a factory-supplied LP conversion kit. Follow the instructions supplied with the LP kit. Refer to Table 6 or the instructions in the propane (LP) conversion kit for the proper gas orifice size.

LoNOx furnaces requiring propane (LP) gas must have the LoNOx screens removed prior to installation and operation. See propane instructions 035-14445-000 or the start up procedure at the back of these instructions on proper removal of the NOx screens.

HIGH ALTITUDE GAS ORIFICE CONVERSION

HIGH ALTITUDE GAS ORIFICE CONVERSIONHIGH ALTITUDE GAS ORIFICE CONVERSION

This furnace is constructed at the factory for natural gas-fired operation at 0 – 8,000 feet (0-m – 2,438 m) above sea level.

The manifold pressure must be changed in order to manitain proper and safe operation when the furnace is installed in a location where the altitude is greater than 8,000 feet (2,438 m) above sea level. Refer to to Table 6 for proper manifold pressure settings.

HIGH ALTITUDE PRESSURE SWITCH CONVERSION

HIGH ALTITUDE PRESSURE SWITCH CONVERSIONHIGH ALTITUDE PRESSURE SWITCH CONVERSION

For installation where the altitude is less than 8,000 feet (2,438 m), it is not required that the pressure switch be changed. For altitudes above 8,000 feet (2,438 m), see Table 16 Field Installed Accessories - High Altitude Pressure Switch

166753-UIM-C-0706

TABLE 6:

PROPANE AND HIGH ALTITUDE CONVERSION KITS

It is very important to choose the correct kit and/or gas orifices for the altitude and the type of gas for which the furnace is being installed. Only use natural gas in furnaces designed for natural gas. Only use propane (LP) gas for furnaces that have been properly converted to use propane (LP) gas. Do not use this furnace with butane gas. Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in premature heat exchanger failure, excessive sooting, high levels of carbon monoxide, personal injury, property damage, a fire hazard and/or death. High altitude and propane (LP) conversions are required in order for the appliance to satisfactory meet the application. An authorized distributor or dealer must make all gas conversions. In Canada, a certified conversion station or other qualified agency, using factory specified and/or approved parts, must perform the conversion. The installer must take every precaution to insure that the furnace has been converted to the proper gas orifice size when the furnace is installed. Do not attempt to drill out any orifices to obtain the proper orifice size. Drilling out a gas orifice will cause misalignment of the burner flames, causing premature heat exchanger burnout, high levels of carbon monoxide, excessive sooting, a fire hazard, personal injury, property damage and/or death.

Nominal Manifold Pressure - High Fire

Single/Second Stage Manifold Pressures (in wc) Single/Second Stage Manifold Pressures (kpa)

800 3.5 3.5 3.5 850 3.5 3.5 3.5 31.7 0.87 0.87 0.87 900 3.5 3.5 3.5 33.5 0.87 0.87 0.87 950 3.5 3.5 3.3 35.4 0.87 0.87 0.81

1000 3.5 3.2 2.9 37.3 0.87 0.80 0.73

(BTU/cu ft.)

Gas Heating Value

1050 3.5 2.9 2.7 39.1 0.87 0.73 0.67 1100 3.2 2.7 2.4 41.0 0.80 0.66 0.61

2500 (LP) 9.8 8.2 7.5 93.2 (LP) 2.44 2.03 1.86

0-7999 8000-8999 9000-9999 0-2437 2438-2742 2743-3048

Altitude (feet) Altitude (m)

29.8 0.87 0.87 0.87

(MJ/cu m)

Gas Heating Value

SECTION V: ELECTRICAL POWER

SECTION V: ELECTRICAL POWERSECTION V: ELECTRICAL POWER

Electrical Power Connections

Field wiring to the unit must be grounded. Electric wires that are field installed shall conform to the temperature limitation for 63°F (35°C) rise wire when installed in accordance with instructions. Refer to Table 7 in these instructions for specific furnace electrical data.

TABLE 7:

Ratings & Physical / Electrical Data - Upflow Models

Input Output

Nominal

Airflow

Cabinet Width

MBH kW MBH kW CFM cmm In. cm °F °C

40 11.7 32 9.4 1200 34.0 14-1/2 36.8 9.0 80.0 25-55 13-31 60 17.6 48 14.1 1200 34.0 14-1/2 36.8 9.0 80.0 25-55 13-31 80 23.5 64 18.8 1200 34.0 14-1/2 36.8 9.0 80.0 35-65 19-36 80 23.5 64 18.8 1600 45.3 17 1/2 44.5 12.0 80.0 25-55 13-31 80 23.5 64 18.8 1600 45.3 21 53.3 12.0 80.0 25-55 13-31

80 23.5 64 18.8

2000 2200

56.6

62.3

21 53.3 14.0 80.0 25-55 13-31

100 29.3 80 23.4 1200 34.0 17 1/2 44.5 12.0 80.0 40-70 22-39 100 29.3 80 23.4 1600 45.3 17 1/2 44.5 12.0 80.0 35-65 19-36 100 29.3 80 23.4 1600 45.3 21 53.3 12.0 80.0 35-65 19-36 100 29.3 80 23.4 2000 56.6 21 53.3 14.0 80.0 25-55 13-31 115 33.7 92 26.9 1600 45.3 21 53.3 12.0 80.0 35-65 19-36 115 33.7 92 26.9 2000 56.6 21 53.3 14.0 80.0 30-60 17-33 130 38.1 104 30.5 2000 56.6 24-1/2 62.2 14.0 80.0 35-65 19-36

Input

Max. Outlet

Air Temp

Blower

MBH kW °F °C Hp Amps In. cm LBS Kg

40 11.7 155 68.3 1/2 7.1 10 x 8 25.4 x 17.7 20 14 105 47.6 60 17.6 155 68.3 1/2 7.1 10 x 8 25.4 x 17.7 20 14 110 49.9 80 23.5 170 76.7 1/2 7.1 10 x 8 25.4 x 17.7 20 14 117 53.1 80 23.5 155 68.3 3/4 11.5 11 x 8 27.9 x 20.3 20 14 126 57.2 80 23.5 155 68.3 3/4 11.5 10 x 10 25.4 x 25.4 20 14 130 59.0

80 23.5 165 73.9 1.0 14.0 11 x 11 27.9 x 25.4 20 12 140 63.5 100 29.3 170 76.7 1/2 7.1 10 x 8 25.4 x 20.3 20 14 128 58.1 100 29.3 165 73.9 3/4 11.5 11 x 8 25.4 x 25.4 20 14 134 60.8 100 29.3 165 73.9 3/4 11.5 10 x 10 25.4 x 25.4 20 14 140 63.5 100 29.3 155 68.3 1.0 14.0 11 x 11 27.9 x 25.4 20 12 145 65.8 115 33.7 170 76.7 3/4 11.5 10 x 10 25.4 x 25.4 20 14 145 65.8 115 33.7 170 76.7 1.0 14.0 11 x 11 27.9 x 25.4 20 12 147 66.7 130 38.1 165 73.9 1.0 14.0 11 x 11 27.9 x 25.4 20 12 158 71.7

Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures. Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes. The furnace shall be installed so that the electrical components are protected from water.

Use copper conductors only.

Blower

Size

Over-Current

Total Unit

Amps

Max

Protect

AFUE

Min. wire Size

(awg) @ 75 ft

one way

Air Temp. Rise

Operation

WGT.

Operation

WGT.

Unitary Products Group 9

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Unitary products group GY8SUH, GM8SUH, GR8SUH, LY8SUH, LM8S*UH Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Unitary products group GY8S*UH, GM8S*UH, GR8S*UH, LY8S*UH, LM8S*UH Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Unitary products group GY8SUH, GM8SUH, GR8SUH, LY8SUH, LM8S*UH Installation Manual