GAS FURNACE - CATEGORY 1 - Instruction Manual

Oct 23, 2026

Instruction manual for Gas Furnaces, Category 1 (Category I). It outlines compliance with ANSI Z21.47/CSA 2.3 and provides critical safety guidance for installers, emphasizing training, hazard awareness during installation and repair, and responsibility for safe operation. Sections include safety considerations, shipping inspection, ESD precautions, product application, location and installation positions, combustion and ventilation air requirements, and Category I venting, followed by electrical connections, gas supply and piping, ductwork filters, and sequence of operation for integrated ignition control.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages40

Reading Time1 h 41 min

AccessFree to download

SAFETY CONSIDERATIONS

Additional Safety Considerations

Shipping Inspection

Electrostatic Discharge (ESD) Precautions

To The Installer

PRODUCT APPLICATION

LOCATION REQUIREMENTS AND CONSIDERATIONS

COMBUSTION AND VENTILATION AIR REQUIREMENTS

CATEGORY I VENTING (VERTICAL VENTING)

ELECTRICAL CONNECTIONS

Wiring Harness

115 Volt Line Connections

24 Volt Thermostat Wiring

GAS SUPPLY AND PIPING

High Altitude Derate

Propane Gas Conversion

DUCTWORK

Filters-Read This Section Before Installing The Return Air Ductwork

SEQUENCE OF OPERATION (INTEGRATED IGNITION CONTROL)

Power Up

Heating Mode

*MES80/*CES80 GAS FURNACE-CATEGORY 1 CATÉGORIE I These furnaces comply with requirements embodied in the American National Standard / National Standard of Canada ANSI Z21 .47·CSA-2 .3 Gas Fired Central Furnaces. ATTENTION INSTALLING PERSONNEL As a professional installer, you have an obligation to know the product better than the customer. This includes all safety precautions and related items. Prior to actual installation, thoroughly familiarize yourself with this Instruction Manual. Pay special attention to all safety warnings. Often during installation or repair, it is possible to place yourself in a position which is more hazardous than when the unit is in operation. Remember, it is your responsibility to install the product safely and to know it well enough to be able to instruct a customer in its safe use. Safety is a matter of common sense...a matter of thinking before acting. Most dealers have a list of specific, good safety practices...follow them. The precautions listed in this Installation Manual are intended as supplemental to existing practices. However, if there is a direct conflict between existing practices and the content of this manual, the precautions listed here take precedence. RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION NOTE: Please contact your distributor or our website listed below for the applicable Specification Sheet referred to in this manual. | PROP 65 WARNING
FOR CALIFORNIA CONSUMERS | | | --- | --- | | | | | Cancer and Reproductive Harm
[www. P65Warnings.ca.gov](www. P65Warnings.ca.gov) | 0140M00517-A | Installer: Affix all manuals adjacent to the unit. Index SAFETY CONSIDERATIONS............................................ 3 Additional Safety Considerations....................................... 4 Shipping Inspection........................................................... 4 Electrostatic Discharge (ESD) Precautions....................... 5 To The Installer.................................................................. 5 PRODUCT APPLICATION................................................. 5 LOCATION REQUIREMENTS AND CONSIDERATIONS .6 Clearances and Accessibility............................................. 7 Installation Positions.......................................................... 7 Horizontal Installation........................................................ 8 Furnace Suspension......................................................... 8 Existing Furnace Removal................................................ 8 Thermostat Location......................................................... 9 COMBUSTION AND VENTILATION AIR REQUIREMENTS...........................................................................................9 CATEGORY I VENTING (VERTICAL VENTING) ............ 10 ONLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL, ADJUST, SERVICE OR REPAIR (HEREINAFTER,“SERVICE”) THE EQUIPMENT SPECIFIED IN THIS MANUAL SHOULD SERVICE THE EQUIPMENT. THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES. IF YOU SERVICE THIS UNIT, YOU ASSUME RESPONSIBILITY FOR ANY INJURY OR PROPERTY DAMAGE WHICH MAY RESULT. IN ADDITION, IN JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES TO SERVICE THE EQUIPMENT SPECIFIED IN THIS MANUAL, ONLY LICENSED PERSONNEL SHOULD SERVICE THE EQUIPMENT. IMPROPER INSTALLATION, ADJUSTMENT, SERVICING OR REPAIR OF THE EQUIPMENT SPECIFIED IN THIS MANUAL, OR ATTEMPTING TO INSTALL, ADJUST, SERVICE OR REPAIR THE EQUIPMENT SPECIFIED IN THIS MANUAL WITHOUT PROPER TRAINING MAY RESULT IN PRODUCT DAMAGE, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. IOG-2021D 03/2020 19001 Kermier Rd. Waller, TX 77484 [www.goodmanmfg.com](www.goodmanmfg.com) • [www.amana-hac.com](www.amana-hac.com) © 2019-2020 Goodman Manufacturing Company, L. P. ® is a registered trademark of Maytag Corporation or its related companies and is used under license. All right

FAQs

What does the manual emphasize for installing personnel before installation?

Installers must thoroughly familiarize themselves with the instruction manual before performing actual installation. The manual stresses paying close attention to safety warnings and recognizing that installation or repair can be more hazardous than normal operation.

How does the manual handle conflicts with existing safety practices?

The precautions in the installation manual are intended to supplement existing practices. If a direct conflict exists, the precautions listed in the manual take precedence.

Which parts of the installation process are covered besides safety warnings?

The manual includes product application, location and installation positions, combustion and ventilation air requirements including Category I venting, and then electrical connections, gas supply and piping, ductwork filtration, and the sequence of operation for the integrated ignition control.

Oct 23, 2026

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