York GF9S*DH, GM9S*DH, GY9S*DH Input, Return1 Rectangular2 Round2 Supply3, Round Duct Size

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268890-UIM-B-0607

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

The following are general duct sizing guidelines that may not serve to requirements of every application.

Example: The furnace input is 80,000 BTUH, 1,200 CFM blower requirement. The recommended duct area is 216 sq.in, there are two 8 x 12 rectangular ducts attached to the plenum and there are two 7 inch round ducts attached to the furnace.

1.Take 8 x 12, which equals 96 square inch x 2 = 192 square inches then go to round duct size located in Table 3.

2.The square inch area for 7 inch round ducts, 38.4 square inch x 2 = 76.8 square inches,

3.Then take the 192 square inch from the rectangular duct and add it to the 76.8 square inch of round duct. The total square inch of duct attached to the furnace supply plenum is 268.8 square inches. This exceeds the recommended 216 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 pres- sure and within the air temperature rise specified on the nameplate. Providing the return duct is properly sized as well.

TABLE 2: Minimum Duct Sizing For Proper Airflow

Input

Nominal Airflow

Return1

Rectangular2

Round2

Supply3

Rectangular2

Round2

BTU/H(kW)

CFM(m³/min)

In² (cm²)

in. x in.(cm x cm)

in. (cm)dia.

In²(cm²)

in. x in.(cm x cm)

in. (cm)dia.

40,000 (11.7)

1,200 (34.0)

280 (1806)

14 x 20 (35.6 x 90.8)

18 (45.7)

216 (1394)

12 x 18 (30.5 x 45.7)

16 (40.6)

60,000 (17.6)

1,200 (34.0)

280 (1806)

14 x 20 (35.6 x 50.8)

18 (45.7)

216 (1394)

12 x 18 (30.5 x 45.7)

16 (40.6)

80,000 (23.4)

1,200 (34.0)

280 (1806)

14 x 20 (35.6 x 50.8)

18 (45.7)

216 (1394)

12 x 18 (30.5 x 45.7)

16 (40.6)

80,000 (23.4)

1,600 (45.3)

360 (2322)

18 x 20 (45.7 x 50.8)

22 (55.8)

280 (1806)

14 x 20 (35.6 x 50.8)

18 (45.7)

100,000 (29.3)

1,600 (45.3)

360 (2322)

18 x 20 (45.7 x 50.8)

22 (55.8)

280 (1806)

14 x 20 (35.6 x 50.8)

18 (45.7)

100,000 (29.3)

2,000 (56.6)

440 (2839)

20 x 22 (50.8 x 55.8)

24 (60.9)

390 (2516)

16 x 22 (40.6 x 55.8)

22 (55.8)

120,000 (35.2)

2,000 (56.6)

440 (2839)

20 x 22 (50.8 x 55.8)

24 (60.9)

390 (2516)

16 x 22 (40.6 x 55.8)

22 (55.8)

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

1.Maximum return air velocity in rigid duct @ 700 feet per minute (213 m/min).

2.Example return main trunk duct minimum dimensions.

3.Maximum supply air velocity in rigid duct @ 900 feet per minute (274m/min).

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 Read- ing.

2.The External Static Pressure is determined by adding the Supply Duct Static Pressure reading to the Return Duct Static Pressure reading.

TABLES 2 AND 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 and 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 build- ing, Refer to the ASHRAE Fundamentals Handbook, Chapter on “DUCT DESIGN” or a company that specializes in Residential and Mod- ular Home duct designs.

IMPORTANT: If the supply air duct is being connected to the furnace without the use of an accessory duct connector, then a transition duct must be installed with flanges or tabs that are securely attach and sealed to the supply air duct and to the base of the furnace. The transi- tion duct must have insulation between the transition duct and any com- bustible material.

The transition duct must be the same dimensional size as the rectangu- lar opening in the base of the furnace.

DOWNFLOW

FURNACE

WARM AIR PLENUM

WITH 1” FLANGES

FIBERGLASS

INSULATION

FIBERGLASS TAPE

UNDER FLANGE

COMBUSTIBLE FLOOR

BASE ACCESSORY

FIGURE 1 : Combustible Floor Base Accessory

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, IX & X for additional informa- tion on correcting the problem.

Unitary Products Group

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Contents List of Sections Section I SafetyList of Figures List of TablesSafety Requirements Specific Safety Rules and PrecautionsAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Combustion AIR Quality List of ContaminantsDirectly BELOW. Keep Clear of ALL OBSTRUC- Tions InspectionFurnace Location and Clearances Ductwork Installation Floor Base and Ductwork InstallationSection II Ductwork Ductwork General InformationRound Duct Size InputReturn1 Rectangular2 Round2 Supply3 Horizontal Installations Without a Cooling Coil Cabinet Horizontal Installations With a Cooling Coil CabinetDownflow Air Conditioning Coil Cabinet Horizontal ModelsCFM Filter InstallationSection III Filters Suspended Furnace / Crawl Space Installation Attic InstallationDownflow Filters Horizontal ApplicationSection IV GAS Piping Afue Section V Electrical PowerElectrical Power Connections Supply Voltage Connections LOW Voltage Control Wiring ConnectionsAC1 Section VI Twinning and Staging Staging Combustion AIR and Vent SafetySection VII Combustion AIR and Vent System Model Input Pipe Size Maximum Combustion AIR/VENT Pipe SizingElbow Dimension Combustion AIR and Vent Piping AssemblyCombustion AIR / Vent Clearances Furnace Vent Connection SizesHome Layout Vent ClearancesHorizontal Vent Assembly Downflow Vent AssemblyVent System Horizontal Vent Applications and TerminationVenting Multiple Units Vertical Vent Applications TerminationCombustion AIR Supply Outdoor Combustion AirCombustion Air Source From Outdoors Ambient Combustion Air SupplyDampers, Louvers and Grilles Canada Only BtuhVentilated Combustion Air Termination Vent and Supply Outside Air Safety Check ProcedureVentilated Combustion Air Condensate Drain Section Viii Condensate PipingCondensate Drain Trap and Drain Freeze Protection Condensate Drain Hose Part NumbersHorizontal Left Air Flow Inducer Low Refer to Figures 31 Hose #5 Hose #1Hose #9 Hose #4 Hose #6 Horizontal Right Air Flow Inducer High Refer to Figures Unitary Products Group HOSE#1 Hose #2 Barbed TEE Hose #4 Hose #7 Hose #9 Section X START-UP Adjustments Section IX Safety ControlsCalculating the Furnace Input Natural GAS Ignition System SequenceUSA use the following formula to calculate the furnace input Inlet GAS Pressure Range Adjustment of Manifold GAS PressureNominal Manifold Pressure Reading the gas pressure with the burner box cover in placeAdjustment of FAN Control Settings Adjustment of Temperature RiseWith Burner BOX Cover in Place With Burner BOX Cover RemovedDiagnostic Fault Code Storage and Retrieval Furnace Control DiagnosticsSlow Green Flash Normal operation Ignition ControlModels Filter PerformanceAirflow Range Minimum Filter Type Opening Size Disposable PleatedModel no Description Used with Field Installed Accessories NON-ELECTRICALApplying Filter Pressure Drop to Determine System Airflow Section XI Wiring Diagram Unitary 5005 Norman Product York Group Drive 73069

GF9S*DH, GY9S*DH, GM9S*DH specifications

The York GM9S*DH, GF9S*DH, and GY9S*DH series air conditioning systems are known for their robust performance, reliability, and energy efficiency. These models are well-suited for both residential and light commercial applications, making them versatile options for a range of users.

One of the standout features of these systems is their high efficiency. The GM9S*DH is equipped with advanced heating and cooling technologies that allow it to achieve excellent SEER (Seasonal Energy Efficiency Ratio) ratings. This translates to lower energy consumption and reduced utility bills for homeowners and business operators alike. The GF9S*DH model further enhances this efficiency by incorporating variable-speed blowers that adjust airflow based on specific needs, ensuring that the system operates only as necessary.

Reliability is another key characteristic of the York GM9S*DH, GF9S*DH, and GY9S*DH series. These models are engineered with durable components and rigorous performance testing, which contributes to their long lifespan and minimizes the need for repairs. Moreover, they come with robust warranties that provide peace of mind for consumers.

In terms of technology, these units utilize a smart thermostat feature that allows for precise temperature control and programmable settings. This feature not only enhances comfort but also contributes to energy savings by allowing users to set optimal cooling or heating schedules. The systems are also designed with quiet operation in mind, employing sound-dampening features that minimize noise levels, which is particularly beneficial for residential installations.

The installation of the York GM9S*DH, GF9S*DH, and GY9S*DH systems is straightforward, offering flexibility in placement and integration with various home or office setups. Their compact design allows them to fit seamlessly into different environments without compromising on performance.

Additionally, the systems are equipped with advanced filtration options that improve indoor air quality by capturing allergens and pollutants. This is particularly beneficial for families with children or members who suffer from allergies.

Overall, the York GM9S*DH, GF9S*DH, and GY9S*DH series provide exceptional performance, energy efficiency, and reliability, making them an ideal choice for maintaining a comfortable indoor environment. With their cutting-edge technologies and user-friendly features, these systems represent an excellent investment for anyone looking to enhance their heating and cooling experience.
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