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GMH8 39" 80% Gas Furnace
80% AFUE, 2-Stage (Convertible),
Multi-Speed, Upflow/Horizontal
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Refer to Service Manual RS6610004 for installation, operation, and 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 ©2006
- 2009 Goodman Manufacturing Company, L.P.
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RT6621014 Rev. 2
June 2009
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Table of Contents
Related Manuals for Goodman GMH80453AN Series
Summary of Contents for Goodman GMH80453AN Series
- Page 1 ® 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 RT6621014 Rev. 2 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 ignition WARNING 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, An interlock switch prevents furnace operation if the blower THIS FURNACE MUST BE ATEGORY VENTED. - Page 5 PRODUCT DESIGN Accessibility Clearances (Minimum) High Altitude Derate Unobstructed front clearance of 24" for servicing is rec- When this furnace is installed at high altitude, the appropri- ommended. ate High Altitude orifice kit must be installed. This is re- quired due to the natural reduction in the density of both the gas fuel and combustion air as altitude increases.
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Page 6: Component Identification
COMPONENT IDENTIFICATION Primary Limit Pressure Switch Flue Pipe Connection Gas Line Entrance (Alternate) Gas Line Entrance Induced Draft Blower Rollout Limit Blower Door Interlock Switch Inshot Burner Gas Manifold Circulator Blower Junction Transformer Integrated Control Module Upflow/Horizontal 10 Induced Draft Blower 1 Gas Valve 11 Blower Door Interlock Switch 2 Gas Line Entrance (Alternate) - Page 7 PRODUCT DIMENSIONS GMH8 UNITS GMH80453AN** 12.5 GMH80703AN** GMH80704BN** GMH80903BN** 17.5 GMH80904BN** GMH80905CN** 19.5 GMH81155CN** GMH81405DN** 24.5 All dimensions are in inches.
- Page 8 PRODUCT DESIGN PRESSURE SWITCH TRIP POINTS PRESSURE SWITCH TRIP POINTS AND USAGE CHART AND USAGE CHART SQUARE NOSE ROUND NOSE TRIP POINT ID BLOWER TRIP POINT ID BLOWER ID BLOWER PRESSURE ID BLOWER PRESSURE MODEL MODEL PRESSURE SWITCH PRESSURE SWITCH SWITCH PART # SWITCH...
- 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: NOTE: Complete lineup of thermostats can be found in the Thermostat Specification Sheets. 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. Installing this furnace without filters will void the unit warranty. Upflow Filters This furnace has provisions for the installation of return air filters at the side and/or bottom return.
- Page 11 PRODUCT DESIGN Dual $aver Configuration & Operation Dual$aver This furnace is capable of the following heating modes: • Single Stage (Factory Setting) • Modifi ed Two-Stage Fixed 5-Min Low Stage Auto Time (1-12 Min) Low Stage To change from the factory single-stage operation, adjust the dipswitches on the ignition control as follows: Off On Mode...
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Page 12: Furnace Specifications
FURNACE SPECIFICATIONS MODEL Input, Natural Gas (BTUH) 45,000 70,000 70,000 90,000 90,000 90,000 115,000 140,000 36,000 56,000 56,000 72,000 72,000 72,000 92,000 112,000 Output, Natural Gas (BTUH) Output, LP (BTUH) 32,000 48,000 48,000 64,000 64,000 64,000 80,000 96,000 A.F.U.E. 80.0% 80.0% 80.0% 80.0%... -
Page 13: Blower Performance Specifications
BLOWER PERFORMANCE SPECIFICATIONS BLOWER PERFORMANCE (CFM & Temperature Rise vs. External Static Pressure) EXTERNAL STATIC PRESSURE (Inches Water Column) Tons AC Model Motor at 0.5" Heating Speed Speed As Shipped CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM HIGH 1555 1511... - Page 14 BLOWER PERFORMANCE SPECIFICATIONS...
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Page 15: Wiring Diagrams
WIRING DIAGRAMS GMH8 WARNING:DISCONNECT POWER BEFORE INTEGRATED HUMIDIFIER CONTROL MODULE SERVICING.WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED. XFMR (6) GND (8) 24 VAC MVC (9) HUMIDIFIER VALVE MVH (12) MVL (2) ID BLOWER PRESSURE SWITCH PS (10) 5 MIN 2 STG MODE PSO (4) - Page 16 SCHEMATICS HIGH VOLTAGE! 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. CIRCULATOR BLOWER ELECTRONIC INDUCER AIR CLEANER HEAT PARK HEAT COOL ROLLOUT SWITCH XFMR...