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Goodman GMN SERIES User Manual

Goodman GMN SERIES
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INSTALLATION
& OPERATING
INSTRUCTIONS
for GMN SERIES
GAS FURNACES
(PATENT PENDING)
Goodman Manufacturing Company, L.P.
IO-554 1501 Seamist, Houston, Texas 77008 11/93
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Goodman GMN SERIES Specifications

General IconGeneral
AFUEUp to 96%
Fuel TypeNatural Gas
Heat ExchangerStainless Steel
Blower MotorVariable Speed
Cabinet TypeUpflow, Downflow, or Horizontal
Heating Capacity40, 000 - 120, 000 BTU/h
StagesSingle-Stage or Two-Stage
Motor TypeECM
Warranty10-Year Parts

Summary

Typical Upflow Installation

Typical Down Flow Installation

General Information

Clearance and Accessibility Requirements

Details required clearances from combustible materials for safe furnace installation.

Changing Orientation of Vent Blower

Converting Furnace to Downflow Configuration

Combustion and Ventilation Air Supply

Requirements and guidelines for providing adequate air for combustion and ventilation.

Venting

General Instructions and Materials

General guidelines, safety precautions, and materials for furnace venting.

Installation Guidelines

Specific installation requirements and prohibitions for furnace venting.

Venting System Components and Procedures

Condensate Drain

Information on handling condensate drainage from the heat exchanger.

Horizontal Venting Installation

Converting Furnace to Propane

Gas Supply and Piping

Detailed instructions and safety precautions for gas supply and piping installation.

Circulating Supply Air and Return Air

Electrical Connection

Thermostat Location and Low Voltage Connections

Guidance on thermostat placement and connecting low voltage wiring.

Setting the Thermostat Heat Anticipator

To Rate Furnace

General and High Altitude Considerations

Information on gas types, rating, and high altitude adjustments for furnace input.

Timing the Gas Meter

Main Burner Adjustment

Safety Controls Functions and Checkout Procedure

Burner and Limit Safety Controls

Details on main limit, vent pressure, and flame roll-out safety controls.

Flame Sensor and Blower Door Interlock

Information on flame sensor function and blower door interlock switch.

Stack Overtemp Switch

Fan Control / Ignition Module

Explanation of the integrated hot surface ignition and fan control module.

Circulating Air Filters

Instructions on maintaining and replacing circulating air filters.

Temperature Rise

Motor Lubrication and Maintenance

Guidance on motor maintenance, lubrication, and cleaning.

System Operation and Heat Exchanger Cleaning

Guidelines for performance and procedures for heat exchanger cleaning.

Cleaning and Inspecting the Heat Exchanger

Lighting Instructions

Safety Warnings and Operating Procedures

Essential safety warnings and step-by-step instructions for lighting the furnace.

To Turn Off Gas to Appliance

Procedure for safely shutting off the gas supply to the appliance.

Sequence of Operation

Heating Mode

Detailed sequence of operations when the furnace is in heating mode.

Cooling Mode

Detailed sequence of operations when the furnace is in cooling mode.

Normal Operation

Heating Mode

Graphical overview of the furnace's heating cycle stages.

Cooling Mode

Graphical overview of the furnace's cooling cycle stages.

Wiring Diagram

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