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Goodman AM9S80 User Manual

Goodman AM9S80
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Service and Troubleshooting


Copyright © 2021 Goodman Manufacturing Company, L.P.
RS6621008
July 2021
TABLE OF CONTENTS
IMPORTANT INFORMATION ............................................ 2
PRODUCT IDENTIFICATION ........................................... 4
SYSTEM OPERATION ...................................................... 5
SCHEDULED MAINTENANCE ....................................... 25
SERVICING ..................................................................... 29
CHECKING VOLTAGE .............................................. 30
CHECKING WIRING .................................................. 30
CHECKING THERMOSTAT, WIRING ....................... 30
CHECKING TRANSFORMER AND CONTROL
CIRCUIT ...................................................................... 31
CHECKING AIR CIRCULATOR BLOWER MOTOR 31
CHECKING DUCT STATIC ........................................ 32
CHECKING TEMPERATURE RISE .......................... 32
CHECKING PRIMARY LIMIT CONTROL ................. 33
CHECKING AUXILIARY LIMIT CONTROL ............... 33
CHECKING FLAME ROLLOUT CONTROL ............. 34
INDUCED DRAFT BLOWER MOTOR ...................... 35
CHECKING GAS VALVE (REDUNDANT) ................ 35
CHECKING MAIN BURNERS ................................... 35
CHECKING ORIFICES .............................................. 35
CHECKING GAS PRESSURE .................................. 36
CHECKING HOT SURFACE IGNITER ..................... 38
CHECKING FOR FLASHBACK ................................. 38
CHECKING PRESSURE SWITCH............................ 38
HIGH ALTITUDE APPLICATION ............................... 39
CHECKING FOR DELAYED IGNITION .................... 39
CHECKING INTEGRATED IGNITION CONTROL
BOARDS ..................................................................... 40
CHECKING FLAME SENSOR ................................... 40
AIRFLOW TABLES ........................................................ 42
1 STAGE STATUS CODES ........................................... 50
1 STAGE TROUBLESHOOTING CODES.................... 52
WIRING DIAGRAMS ....................................................... 54
Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.

technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual. 







-
-










Questions and Answers:

Goodman AM9S80 Specifications

General IconGeneral
ModelAM9S80
Heating Capacity40, 000-120, 000 BTU/h
Warranty10-Year Parts Limited Warranty, Lifetime Heat Exchanger Limited Warranty
StagesSingle-Stage
ConfigurationUpflow/Horizontal
Efficiency80% AFUE
Fuel TypeNatural Gas
Blower Motor TypeVariable Speed

Summary

Service and Troubleshooting

IMPORTANT INFORMATION

General notices about safety and service, including symbols and warnings.

CARBON MONOXIDE POISONING HAZARD

Critical safety information regarding carbon monoxide dangers.

SYSTEM OPERATION

Details on furnace operation, sequences, and electrical connections.

FURNACE STARTUP

Step-by-step guide for safely starting the furnace.

SAFETY

Comprehensive warnings and cautions for installation and operation.

LOCATION REQUIREMENTS AND CONSIDERATIONS

Guidelines for selecting an appropriate installation location.

COMBUSTION AND VENTILATION AIR REQUIREMENTS

Critical information on air supply needed for safe operation.

CATEGORY I VENTING (VERTICAL VENTING)

Specific requirements for venting 80% furnaces.

MASONRY CHIMNEYS

Guidelines for venting through masonry chimneys.

PROPANE GAS AND/OR HIGH ALTITUDE INSTALLATIONS

Instructions for converting to propane or installing at high altitudes.

GAS SUPPLY AND PIPING

Guidelines for connecting the gas supply and piping.

SCHEDULED MAINTENANCE

ANNUAL INSPECTION

Recommended annual checks for furnace components and safety.

SERVICING

CHECKING GAS PRESSURE

Procedure for measuring and verifying gas supply pressure.

GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT

Measuring and adjusting manifold gas pressure for optimal combustion.

1 STAGE TROUBLESHOOTING CODES

WIRING DIAGRAMS

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