Nordyne M1GH 077 User Manual

For installation in:
1. Manufactured Homes
2. Recreational Vehicles, Park Models,
Manufactured Buildings
3. Modular Homes/Buildings
WARNING:
If the information in this manual is not
followed exactly, a fi re or explosion
may result causing property damage,
personal injury or loss of life.
– Do not store or use gasoline or
other fl ammable vapors and liquids
in the vicinity of this or any other
appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your build-
ing.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fi re department.
– Installation and service must be
performed by a qualifi ed installer,
service agency or the gas sup-
plier.
WARNING:
Should overheating occur, or the gas
supply fail to shut off, shut off the man-
ual gas valve to the appliance before
shutting off the electrical supply.
WARNING:
Improper installation, adjustment,
alteration, service or maintenance
can cause injury or property damage.
Refer to this manual. For assistance
or additional information consult a
qualifi ed installer, service agency or
the gas supplier.
Owners Manual/Installation Instructions
Series M1B, M1G, M1M and M1S
Downfl ow, Direct Vent (Sealed Combustion)
Forced Air Gas and Oil Furnaces
LEAVE THESE INSTRUCTIONS WITH THE HOMEOWNER.

Nordyne M1GH 077 Specifications

General

Brand	Nordyne
Model	M1GH 077
Type	Gas Furnace
Heating Capacity	77, 000 BTU
Efficiency Rating	80%
Efficiency	80% AFUE
Blower Type	Multi-Speed
Fuel Type	Natural Gas
Blower Motor	PSC
Ignition Type	Hot Surface Ignition
Vent Diameter	4 inches
Weight	120 lbs

Summary

Installation Procedures

Floor Opening and Fuel Line Hole Cut-Out

Procedures for cutting floor openings and fuel line holes.

Ceiling and Roof Opening Cut-Outs

Instructions for cutting ceiling and roof openings for venting.

Installation Details and Connector Methods

Preventing Debris in Furnace

Furnace and Duct Connector Installation

Alternate Duct Connector Attachment Methods

Furnace and Roof Jack Installation

Placing and Securing the Furnace

Steps to position and secure the furnace in its location.

Roof Jack Assembly and Sealing

Procedures for assembling and sealing the roof jack assembly.

Manufactured Home Factory Installation

Manufactured Home Site Installation

Electrical Wiring Diagrams

Electrical Wiring Connections

Connecting Power Supply Wires

Steps for connecting the main power supply wires to the furnace.

Connecting Thermostat Wires

Instructions for connecting thermostat wiring to the furnace.

Fuel Piping and Gas Supply

Fuel Line Sizing and Installation Regulations

Flue Gas Sampling and Furnace Lighting

General Lighting and Safety Information

Safety precautions to follow before lighting the furnace.

Standing Pilot Model Lighting Instructions

Step-by-step guide for lighting standing pilot models.

Furnace Lighting and Shutdown Procedures

Turning Off Gas to the Appliance

Procedure to safely turn off gas supply to the furnace.

Standing Pilot Sequence of Operation

Ignition Sequences and Operating Instructions

Induced Draft Blower Sequence

Safety and Operating Instructions

Safety and operating steps for direct ignition models.

Direct Ignition Lighting and Safety

Lighting and safety procedures for M1M direct ignition models.

Gas Appliance Shutdown Procedure

Steps to shut down gas appliances.

Direct Ignition Sequence of Operation

Ignition Sequences and Furnace Operation

M1M Direct Ignition Operation Details

Oil Gun Furnace Operation

Operating instructions for oil gun furnace models.

Oil Furnace Control Sequences

Furnace Operation Sequences and Shutdown

Oil Furnace Operation Steps

Gas Gun Furnace Operation

Operating instructions for gas gun furnace models.

Gas Gun Ignition Sequence

Gas/Oil Appliance Shutdown

Furnace Controls and Service Guide

Burner Adjustments

Atmospheric Gas Burner Adjustments

Gas Pressure Adjustment

Pilot Flame Adjustment (Standing Pilot)

Service Guide: Combustion Air and Ignition

Combustion Air Requirements and Adjustment

Gas Gun Combustion Air Adjustment

Oil Gun Combustion Air and CO2 Levels

Oil Gun Electrode Setting

Service Guide: Gas Conversion and Troubleshooting

Gas Conversion Procedure

Atmospheric and Direct Ignition Furnace Conversion

Standing Pilot Models: Main Burner No Start

Troubleshooting when the main burner does not ignite.

Troubleshooting Standing Pilot Models

Standing Pilot Models: No Main Flame

Troubleshooting no main flame after ignition.

Control Module Status Indicators (M1M, M1B, M1S)

Pilot Will Not Light or Goes Out

Troubleshooting steps for pilot light issues.

Troubleshooting Pilot and Flame Issues

Pilot Light Troubleshooting Checks

Further checks for pilot light issues.

Diagnosing Improper Main Flame Burning

Burner Motor Does Not Run

Troubleshooting burner motor failure.

Combustion Blower Runs, No Flame

Diagnosing blower operation without flame.

Control Module Powered, Ignitor Not Heating

Troubleshooting ignitor heating issues.

120 Volts Available, Ignitor Not Heating

Specific ignitor heating issues with 120V supply.

Main Flame Ignites, Burner Locks Out

What to do when the burner locks out after ignition.

Troubleshooting Furnace Operation

Diagnosing Burner Short Cycling

Checks for burner short cycling.

No Main Gas Flow Troubleshooting

Steps for when no main gas flow occurs.

Troubleshooting Low Heat Output

Diagnosing Flame Without Motor

Troubleshooting Blower Not Operating

Steps for when the blower does not run.

Burner Does Not Start with Call for Heat

Troubleshooting oil burner start issues.

Burner Lockout Troubleshooting (R7184/7505)

Specific lockout troubleshooting for controls.

Maintenance and Control Reset Procedures

Control Reset and Lockout Procedures

How to reset controls and handle lockouts.

Cad Cell Resistance Check

Homeowner Maintenance Tasks

Serviceman Maintenance Tasks

Wiring Diagrams Overview

Wiring Diagrams Details

Wiring Diagrams Information

Wiring Diagrams Guide

Wiring Diagrams Reference

Wiring Diagram Notes and Polarization

Essential notes for interpreting wiring diagrams and power polarization.

Wiring Diagram Specifics

Wiring Diagram Notes and Specifications

Equivalent Orifice Sizes at High Altitudes

Altitude and Orifice Size Adjustments

Orifice Modification Warning