Goodman GMH8 Technical Manual
Gmh8 33-3/8" 80% gas furnace 80% afue, 2-stage (convertible), multi-speed, upflow/horizontal
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Also See for GMH8:
- Installation instructions manual (32 pages) ,
- Service instructions manual (66 pages) ,
- Service instructions manual (7 pages)
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GMH8 33-3/8" 80% Gas Furnace
80% AFUE, 2-Stage (Convertible),
Multi-Speed, Upflow/Horizontal
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Refer to Service Manual RS6612007 for troubleshooting information.
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All safety information must be followed as provided in the Service Manual.
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Refer to the appropriate Parts Catalog for part number information.
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Model numbers listed on page 3.
This manual is to be used by qualified, professionally trained HVAC technicians only.
Goodman does not assume any responsibility for property damage or personal injury
due to improper service procedures or services performed by an unqualified person.
Copyright ©2011, 2013 Goodman Manufacturing Company, L.P.
TECHNICAL MANU
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RT6621024r4
November 2013
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Table of Contents
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Summary of Contents for Goodman GMH8
- Page 1 Model numbers listed on page 3. This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person.
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Page 2: Product Identification
Disconnect ALL power before servicing or installing this unit. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. Goodman will not be responsible Installation and repair of this unit WARNING WARNING... - Page 3 WARNING that is not design certified by damage, personal injury, or death, Goodman for use with this unit. do not store combustible materials or use gasoline or Serious property damage, personal injury, reduced unit other flammable liquids or vapors in the vicinity of this performance and/or hazardous conditions may result appliance.
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Page 4: Product Design
PRODUCT DESIGN General Operation The GMH8 furnaces are equipped with an electronic igni- WARNING tion device used to light the burners and an induced draft blower to exhaust combustion products. O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,... - Page 5 PRODUCT DESIGN Accessibility Clearances (Minimum) High Altitude Derate Unobstructed front clearance of 24" for servicing is rec- IMPORTANT NOTE: The furnace as shipped requires no ommended. change to run between 0 - 5500 feet. Do not attempt to increase the firing rate by changing orifices or increasing the manifold pressure below 5500 feet.
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Page 6: Component Identification
COMPONENT IDENTIFICATION Tubular Heat Exchanger Pressure Switch Flue Pipe Connection Induced Draft Blower (Chimney Transition Top Shipped Loose) Gas Line Entrance Gas Valve Rollout Limit Junction Box Wiring Harness Grommet Gas Manifold Gas Line Entrance (Alternate) Inshot Burner Transformer Circulator Blower Blower Door Interlock Switch Integrated Control Module... -
Page 7: Product Dimensions
PRODUCT DIMENSIONS GMH8 Alt. Gas Inlet Alt. Gas Inlet Alt. High Voltage High Voltage Inlet Low Voltage Alt. LowVoltage UNITS GMH80403A*** 12.5 GMH80603A*** GMH80604B*** GMH80803B*** 17.5 GMH80804B*** GMH80805C*** 19.5 GMH81005C*** GMH81205D*** 24.5 GMH 81405D NC* 24.5 All dimensions are in inches. - Page 8 GMH81005C*BB GMH81205D*BA -0.80 0130F00042 -0.80 0130F00042 GMH81405DNCC For installaions in Canada, the GMH8 furnace is certified only to 4,500 ft. * Negative pressure readings are in inches of water column (*w.c.) PRIMARY LIMIT Part Number 20162904 20162903 20162901 Open Setting (°F)
- Page 9 GDH8 furnaces, in dedicated downflow applications. These coils are available in both cased and uncased models (with the option of a field installed TXV expansion device). These 80% furnaces match up with the existing Goodman ®...
- Page 10 PRODUCT DESIGN Thermostats: It is recommended that a single-stage heat , non-power robbing thermostat be used. Refer to the product marketing literature for a complete list of thermostats offered. Filters: Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or CAN/ULCS111 standards.
- Page 11 PRODUCT DESIGN Dual $aver Configuration & Operation Dual$aver This furnace is capable of the following heating modes: • Single Stage (Factory Setting) • Modified Two-Stage > Fixed 5-Min. Low Stage > Auto Time (1-12 Min.) Low Stage To change from the factor single-stage operation, adjust the dipswitches on the ignition control as follows: HEAT OFF SECOND...
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Page 12: Furnace Specifications
GMH8***BB FURNACE SPECIFICATIONS MODEL Input, Natural Gas (BTUH) 40,000 60,000 60,000 80,000 80,000 32,000 48,000 48,000 64,000 64,000 Output, Natural Gas (BTUH) Output, LP (BTUH) 32,000 48,000 48,000 64,000 64,000 A.F.U.E. 80.0% 80.0% 80.0% 80.0% 80.0% Rated External Static (" w.c.) 0.20 - 0.50... - Page 13 GMH8***BB FURNACE SPECIFICATIONS GMM81405DNCC MODEL Input, Natural Gas (BTUH) 80,000 100,000 120,000 140,000 Output, Natural Gas (BTUH) 64,000 80,000 96,000 112,000 Output, LP (BTUH) 64,000 80,000 96,000 96,000 A.F.U.E. 80.0% 80.0% 80.0% 80.0% Rated External Static (" w.c.) 0.20 - 0.50 0.20 - 0.50...
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Page 14: Blower Performance Specifications
GMH8***BB BLOWER PERFORMANCE SPECIFICATIONS GMH81405DNCC (CFM & Temperature Rise vs. External Static Pressure) EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model Motor at 0.5" Speed CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM HIGH... - Page 15 BLOWER PERFORMANCE SPECIFICATIONS...
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Page 16: Wiring Diagrams
WIRING DIAGRAMS GMH8 WARNING:DISCONNECT POWER BEFORE HUMIDIFIER INTEGRATED CONTROL MODULE SERVICING.WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED. XFMR (6) GND (8) 24 VAC HUMIDIFIER MVC (9) VALVE MVH (12) MVL (2) ID BLOWER PRESSURE AUXILIARY SWITCH LIMIT CONTROLS... -
Page 17: Wiring Diagram
GAS VALVE PRESSURE SWITCH TYPICAL SCHEMATIC GMH8 ____** MODEL FURNACES WR 50M56-289 INTEGRATED IGNITION CONTROL This schematic is for reference only. Not all wiring is as shown above. Always refer to the appropriate wiring diagram for the unit being serviced.