Nordyne M1MB 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 M1MB 090 Specifications

General

Brand	Nordyne
Model	M1MB 090
Category	Furnace
Language	English

Summary

MANUFACTURER WARRANTY AND OWNER RESPONSIBILITIES

INSTALLATION STANDARDS

MINIMUM CLEARANCES

ROOF JACK SELECTION

INSTALLATION PROCEDURES

FURNACE AND DUCT CONNECTOR INSTALLATION

FURNACE AND ROOF JACK INSTALLATION

TRANSIT-MODE VENTING SYSTEM INSTALLATION

ELECTRICAL WIRING

Power Supply and Thermostat Wiring

FUEL PIPING INSTALLATION

Gas Piping Requirements

Requirements for sizing and installing fuel lines for natural gas and LP gas.

Oil Tank and Piping Installation

FURNACE LIGHTING, OPERATION, AND SHUTDOWN

Pre-Lighting Safety and Pilot Lighting

Crucial safety warnings, gas detection procedures, and steps for lighting standing pilots.

Furnace Operation Sequences

Details sequences of operation for standing pilot, induced draft, and direct ignition systems.

Oil and Gas Gun Furnace Operations

Operating instructions and sequences for oil gun and gas gun furnaces, including control types.

SERVICE GUIDE AND BURNER ADJUSTMENTS

Burner Adjustments and Gas Pressure

Combustion Air Adjustment

TROUBLESHOOTING GUIDE

Control Module Status Indicators

Explains the meaning of red and yellow LED indicators for M1M, M1B, and M1S series control modules.

Pilot Not Lighting or Going Out

Troubleshooting steps for issues related to pilot flame failure, including gas pressure and thermocouple checks.

COMMON FURNACE ISSUES AND SOLUTIONS

Main Flame and High Gas Bill Troubleshooting

Solutions for issues with main flame ignition, burner operation, and high gas consumption.

Ignition and Burner Lockout Troubleshooting

Diagnosing ignition failures, burner lockouts, and issues with the control module and ignitor.

ADDITIONAL TROUBLESHOOTING SCENARIOS

Burner and Blower Operation Issues

Troubleshooting for burner flame without motor, circulation blower failure, and oil gun burner start issues.

Oil Gun Control Lockout and Cad Cell Checks

Steps to reset oil gun controls, check cad cell resistance, and diagnose lockout conditions.

PERIODIC MAINTENANCE

Homeowner Maintenance Tasks

Instructions for homeowners on return air, filter cleaning, and seasonal checks for ice formation.

Serviceman Maintenance Checklist

A checklist for servicemen covering cleaning, inspection of components, and necessary adjustments.

WIRING DIAGRAMS

Gas Atmospheric Furnace Wiring

Standing Pilot Furnace Wiring

A/C Ready Furnace Wiring

Direct Ignition & Gas/Oil Series Furnace Wiring

HIGH ALTITUDE ORIFICE SIZING

Orifice Size Adjustment for Altitude