Goodman GMNT User Manual

All information contained herein is subject to change without notice.
Goodman Manufacturing Company, L.P.
I0-213D 2550 North Loop West, Suite 400, Houston, TX 77092 2/04
www.goodmanmfg.com
© 2003-2004 Goodman Manufacturing Company, L.P.
WARNING
DO NOT USE THIS FURNACE IF ANY PART HAS
BEEN UNDER WATER. IMMEDIATELY CALL A
QUALIFIED SERVICE TECHNICIAN TO INSPECT
THE FURNACE AND TO REPLACE ANY PART OF
THE CONTROL SYSTEM AND ANY GAS CONTROL
THAT HAS BEEN UNDER WATER.
WARNING
THIS FURNACE IS DESIGN CERTIFIED FOR
INSTALLATION IN BUILDINGS CONSTRUCTED ON
SITE ONLY.
C
US
®
INSTALLATION & OPERATING
INSTRUCTIONS
for GMNT
CONDENSING GAS FURNACE
(CATEGORY IV)
ama
EFFICIENCY
RATING
CERTIFIED
WARNING
IF THIS FURNACE IS INSTALLED IN AN ENCLOSED
AREA, SUCH AS A GARAGE OR UTILITY ROOM,
EITHER ALONE OR WITH ANY OTHER CARBON
MONOXIDE PRODUCING DEVICE (E.G.
AUTOMOBILE, SPACE HEATER, WATER HEATER,
ETC.), ENSURE THAT THE ENCLOSED AREA IS
PROPERLY VENTILATED.
WARNING
CARBON MONOXIDE (REFERRED TO AS CO) CAN
CAUSE SERIOUS PERSONAL INJURY OR DEATH.

Goodman GMNT Specifications

General

Brand	Goodman
Model	GMNT
Category	Furnace
Language	English

Summary

General Safety Warnings

Installation & CO Hazard Information

Key warnings on site certification, carbon monoxide risks, and ventilation.

Replacement Parts and Service

Ordering Furnace Components

Information on obtaining replacement parts and contacting the service department.

General Installation Requirements

Compliance Standards and Flexibility

Furnace installation options, technician qualifications, and code adherence.

Installation Site and Air Supply Basics

Location, Clearances, and Combustion Air Intro

Guidelines for placement, safety clearances, and introduction to combustion air.

Detailed Combustion Air Requirements

Sources and Intake Methods

Details on vent types, air sources, and pipe sizing for combustion air.

Venting System Installation

Pipe Sizing and Horizontal Venting

Specifications for vent pipe lengths, elbows, and through-wall installation.

Vent Termination and Pipe Joining

Pipe Connections and Termination Methods

Instructions for joining pipes, terminating vents, and debris screening.

Condensate Management and Freezing Protection

Drainage, Freezing Prevention, and Protection

Guidelines for condensate removal and protecting systems from freezing.

Gas Piping and Air Circulation

Gas Pipe Sizing and Air Supply

Table for gas pipe sizing and requirements for circulating air.

Electrical Connections and Features

Power Supply and Control Wiring

Instructions for electrical supply, thermostat, and feature connections.

Furnace Rating and Gas Timing

Altitude Adjustment and Gas Metering

Procedure for rating the furnace, adjusting for altitude, and timing gas input.

Gas Valve Adjustment Procedures

Outlet Pressure and Inlet Reading

Detailed steps for adjusting gas valve outlet pressure and reading inlet pressure.

Safety Control Functions and Testing

Limit, Pressure, and Flame Safety Checks

Procedures for testing main limit, vent pressure, roll-out, and flame sensor controls.

Maintenance and Operation

Filters, Temperature Rise, and Motor Care

Maintenance for air filters, temperature rise, and motor lubrication.

Service Instructions and Operation Sequences

General service guidelines and explanation of heating/cooling operation modes.

Appliance Servicing and Cleaning

Removing Units and Cleaning Heat Exchanger

Steps for appliance replacement and heat exchanger inspection/cleaning.

Lighting and Operation Procedures

Pre-Operation Safety and Startup

Essential safety checks before lighting, and startup steps.

Furnace Operation and Shutdown

Instructions for operating the furnace and safely turning off the gas supply.

Wiring Diagram

Furnace Electrical Schematic

Detailed schematic illustrating the furnace's electrical connections and components.