SS-GMH8 www.goodmanmfg.com 8/11 Supersedes 3/11 Standard Features • Dual-diameter tubular heat exchanger • Two-stage gas valve Dual$aver™ technology that allows the installer to activate the two-stage valve with the flip of a dipswitch • 110V Silicon Nitride igniter • Quiet four-speed direct-drive circulating blower motor • Furnace control board with self-diagnostics, color-coded low-voltage terminals and provisions for electronic air cleaner and 24-volt humidifiers • Control board stores the last five diagnostic codes in memory; simple push-button activation outputs the fault history to a flashing red LED • Low constant fan allows homeowner to activate the low heat speed to efficiently circulate air throughout the home • Self-adjusting feature automatically adjusts furnace to high- or low-stage operation based on outside temperature without an outdoor temperature sensor Cabinet Features • Fully insulated, heavy-gauge steel cabinet with durable baked-enamel finish • Foil-faced insulation lines the heat exchanger compartment • Factory-sealed to achieve 2% or less leakage rate at 1.0” water gauge external duct static pressure • Designed for multi-position installation: upflow, horizontal left or right • Removable bottom for side or bottom return applications • Convenient left or right connection for gas/electric service • Coil and furnace fit flush for most installations MULTI-POSITION, MULTI-SPEED DUAL$AVER™ GAS FURNACES 80% AFUE HEATING INPUT: 45,000–140,000 BTU/H ™ GMH8/GDH8 Contents Nomenclature .................................................................... 2 Product Specifications ....................................................... 3 Dimensions ........................................................................ 5 Airflow Data ....................................................................... 7 Wiring Diagram................................................................ 10 Dual$aver Operation ....................................................... 11 Accessories ....................................................................... 12 * Complete warranty details available from you local dealer or at www.goodmanmfg.com. To receive the Lifeme Heat Exchanger Limited Warranty (good for as long as you own your home), 10-Year Unit Replacement Limited Warranty and 10-Year Parts Limited Warranty, online registraon must be completed within 60 days of installaon. Online registraon is not required in California or Québec.
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SS-GMH8 www.goodmanmfg.com 8/11Supersedes 3/11
Standard Features• Dual-diametertubularheatexchanger• Two-stagegasvalveDual$aver™technologythatallowstheinstallertoactivatethetwo-stagevalvewiththeflipofadipswitch
* Complete warranty details available from you local dealer or at www.goodmanmfg.com. To receive the Lifetime Heat Exchanger Limited Warranty (good for as long as you own your home), 10-Year Unit Replacement Limited Warranty and 10-Year Parts Limited Warranty, online registration must be completed within 60 days of installation. Online registration is not required in California or Québec.
Product sPeciFications Product sPeciFications
2 www.goodmanmfg.com SS-GMH8
noMenclature
Brand Revisions
G Goodman® Brand Major and or Dis0nc0ons™ Minor Revisions
Airflow Direc2on NOxC Downflow/Horizontal N Natural GasD Dedicated Downflow X Low NOxH High AirflowK Dedicated Upflow Cabinet WidthM Upflow/Horizontal A 14”
B 17½”Descrip2on/Motor C 21”V Two-‐Stage/Variable-‐speed D 24½”H Two-‐Stage/Mul0-‐speedS Single-‐Stage/Mul0-‐speed Maximum CFM @ 0.5” ESPE Two-‐Stage/EEM Motor 3 1200 4 1600 5 2000
¹ Natural Gas BTU/h. For altitudes above 2,000’, reduce input rating 4% for each 1,000’ above sea level. Low-fire rate is 75% of high-fire rate² DOE AFUE based upon Isolated Combustion System (ICS)³ Vent and combustion air diameters may vary depending upon vent length. Refer to the latest editions of the National Fuel Gas Code NFPA 54/ANSI Z223.1
(in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2 (in Canada).⁴ Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps. Wire size should be determined in accordance with National Electrical
Codes. Extensive wire runs will require larger wire sizes.⁵ Maximum Overcurrent Protection Device refers to maximum recommended fuse or circuit breaker size. May use fuses or HACR-type circuit breakers of the
same size as noted.
Notes:• All furnaces are manufactured for use on 115 VAC, 60 Hz, single-phase electrical supply.• Gas Service Connection ½” FPT• Important: Size fuses and wires properly and make electrical connections in accordance with the National Electrical Code and/or all existing local codes.
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sPeciFications — GdH8
GDH80403A**
GDH80603A**
GDH80804B**
GDH81005C**
Heating Capacity
Input¹ 45,000 70,000 90,000 115,000
Natural Gas Output¹ 36,000 56,000 72,000 92,000
LP Gas Output¹ 32,000 48,000 64,000 80,000
AFUE² 80 80 80 80
Temperature Rise Range (°F) 35-65 30-60 35-65 40-70
Available AC @ 0.5” ESP 3 3 4 5
Circulator Blower
Size (D x W) 10 X 6 10 X 6 10 X 8 10 X 10
Horsepower 1/3 1/3 1/2 3/4
Speed 4 4 4 4
Vent Diameter³ 4 4 4 4
No. of Burners 2 3 4 5
Disposable Filter Size (in²) 580 580 770 960
Electrical Data
Min. Circuit Ampacity⁴ 8.5 8.5 12.9 12.9
Max. Overcurrent Protection⁵ 15 15 15 15
Ship Weight (lbs) 120 130 153 175
¹ Natural Gas BTU/h. For altitudes above 2,000’, reduce input rating 4% for each 1,000’ above sea level. Low-fire rate is 75% of high-fire rate
² DOE AFUE based upon Isolated Combustion System (ICS)³ Vent and combustion air diameters may vary depending upon vent length. Refer to the latest editions of the National Fuel Gas
Code NFPA 54/ANSI Z223.1 (in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2 (in Canada).
⁴ Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps. Wire size should be determined in accordance with National Electrical Codes. Extensive wire runs will require larger wire sizes.
⁵ Maximum Overcurrent Protection Device refers to maximum recommended fuse or circuit breaker size. May use fuses or HACR-type circuit breakers of the same size as noted.
Notes:• All furnaces are manufactured for use on 115 VAC, 60 Hz, single-phase electrical supply.• Gas Service Connection ½” FPT• Important: Size fuses and wires properly and make electrical connections in accordance with the National Electrical Code and/or
all existing local codes.
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SS-GMH8 www.goodmanmfg.com 5
GMH8 diMensions
MiniMuM clearances to coMBustiBle Materials
Sides Rear Front¹Vent²
TopSW B
1” 0” 3” 6” 1” 1”
¹ 24” clearance for serviceability recommended.² Single Wall Vent (SW) to be used only as a connector. Refer to the latest editions of the National Fuel Gas Code NFPA 54/
ANSI Z223.1 (in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2 (in Canada).
Note: GMH8 approved for line contact in the horizontal position.
Model A B Model A B
GMH80403A** 14” 12½” GMH80804B** 17½” 16”
GMH80603A** 14” 12½” GMH80805C** 21” 19½”
GMH80604B** 17½” 16” GMH81005C** 21” 19½”
GMH80803B** 17½” 16” GMH81205D** 24½” 23”
Notes:• Line voltage wiring can enter through the right or left side of furnace.
Low-voltage wiring can enter through the right or left side of furnace.• Conversion kits for high-altitude natural gas operation are available. Contact your Goodman distributor or dealer for details.
28”
AB
1-3/4”
33-3/8”
23-5/16”
1-7/16”
23 3/4”
Alt. Gas Inlet
High Voltage Inlet
Low Voltage
13-1/4”
20”
27-7/8”
Alt. Gas Inlet
Alt. High Voltage
Alt. LowVoltage
High-Voltage Inlet
Low-Voltage InletAlt. Low Voltage
Alt. High Voltage
Alt. Gas Inlet
23⁵⁄₁₆”
1⁷⁄₁₆”
27⅞”
20”
13¼”
33⅜”
1¾”Alt. Gas Inlet
23¾”
28”
Product sPeciFications Product sPeciFications
6 www.goodmanmfg.com SS-GMH8
GdH8 diMensions
MiniMuM clearances to coMBustiBle Materials
Sides Rear Front¹Vent²
TopSW B
1” 0” 3” 6” 1” 1”
¹ 24” clearance for serviceability recommended.² Single Wall Vent (SW) to be used only as a connector. Refer to the latest editions of the National Fuel Gas Code NFPA 54/
ANSI Z223.1 (in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2 (in Canada).
Model A B Non-Combustible Floor Base
GDH80403A** 14” 12½” SBT14
GDH80603A** 14” 12½” SBT14
GDH80804B** 17½” 16” SBT17
GDH81005C** 21” 19½” SBT21
Notes:• Line voltage wiring can enter through the right or left side of furnace. Low-voltage wiring can enter through the right or left
side of furnace.• Conversion kits for high-altitude natural gas operation are available. Contact your Goodman distributor or dealer for details.• Installer must supply the following gas line fittings, according to which entrance is used:
◊ Left: One 90º street elbow; one 2½” pipe nipple; one 90º elbow; straight pipe; one ground joint union◊ Right: Straight pipe to reach gas valve
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PRODUCT DIMENSIONSGDH8
MODEL A B NON-COMBUSTIBLEFLOOR BASE
GDH80453AXGDH80703AX 14 12 1/2 SBT14
GDH80904BX 17 1/2 16 SBT17
GDH81155CX 21 19 1/2 SBT21
All dimensions are in inches.
33-3/8”
A
B
28”
High VoltageElectrical
Low VoltageElectrical
Gas Inlet
High-Voltage Electrical
Low-Voltage Electrical
19⅝”
33⅜”Gas Inlet
28”
18⅜”
11⅜”
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SS-GMH8 www.goodmanmfg.com 7
GMH8 airFlow data
(CFM & Temperature Rise vs. External Static Pressure)
Notes• CFM in chart is without filter(s). Filters do not ship with this furnace, but must be provided by the installer. If the furnace requires two return filters, this
chart assumes both filters are installed.• All furnaces ship as high-speed cooling and medium-speed heating. Installer must adjust blower cooling and heating speed as needed.• For most jobs, 400 CFM per ton for cooling is desirable.• INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.• This chart is for information only. For satisfactory operation, external static pressure should not exceed value shown on the rating plate. • The dashed (----) areas indicate a temperature rise not recommended for this model.• The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise
at a particular CFM, while ESP at the CFM will be lower.
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GdH8 airFlow data
(CFM & Temperature Rise vs. External Static Pressure)
Notes:• CFM in chart is without filter(s). Filters do not ship with this furnace, but must be provided by the installer. If the furnace requires two return filters, this
chart assumes both filters are installed.• All furnaces ship as high-speed cooling and medium-speed heating. Installer must adjust blower cooling and heating speed as needed.• For most jobs, about 400 CFM per ton when cooling is desirable.• INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.• This chart is for information only. For satisfactory operation, external static pressure should not exceed value shown on the rating plate.• The dashed (----) areas indicate a temperature rise not recommended for this model.• The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise
at a particular CFM, while ESP at the CFM will be lower.