Nordyne M1GB 090 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 M1GB 090 Specifications

General

Model	M1GB 090
Type	Gas Furnace
Heating Capacity	90, 000 BTU
Efficiency Rating	80%
Efficiency	80% AFUE
Blower Motor	Multi-speed
Fuel Type	Natural Gas
Ignition Type	Direct Spark Ignition
Vent Type	Category I
Weight	130 lbs

Summary

Installation Standards

Installation Procedures

Cut Out Ceiling and Roof Openings

Details how to cut openings in the ceiling and roof for the vent system.

Duct Connector and Mounting Plate Installation

Covers installing duct connectors and the furnace mounting plate.

Transit-Mode Venting System Installation

Install Furnace

Install Roof Jack

Electrical Wiring

Power Supply and Thermostat Wiring

Covers connecting main power supply and low-voltage thermostat wires to the furnace.

Fuel Piping

Fuel Line Hook-Up and Procedures

One-Line and Two-Line Systems

Lighting and Shutdown

Safety Before Lighting

Crucial safety precautions to follow before attempting to light the furnace.

Standing Pilot Procedures

Direct Ignition Procedures

Oil and Gas Gun Furnace Operation

Oil Gun Model Procedures

Gas Gun Model Procedures

Service Guide and Adjustments

Gas Pressure and Pilot Flame

Details on adjusting gas pressure and pilot flame.

Combustion Air and Ignition Settings

Gas Conversion

Troubleshooting Standing Pilot Models

Main Burner and Gas Valve Problems

Troubleshooting for burner ignition and gas valve operation.

Pilot Ignition and Control Indicators

Steps for pilot issues and interpreting control module status lights.

Troubleshooting Direct Ignition Furnaces

Flame and Burner Operation Issues

Troubleshooting for main flame, burner lockouts, and short cycling.

Ignition and Gas Flow Problems

Troubleshooting Oil Gun Furnaces

Burner Fails to Start

Steps to diagnose why the burner does not start on a call for heat.

Burner Locks Out on Safety

Troubleshooting steps when the burner locks out due to safety shutdowns.

Maintenance

Homeowner Maintenance Tasks

Serviceman Maintenance Tasks

Wiring Diagrams

Wiring Diagram M1(S,B) Furnace Series