Nordyne M1MC 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 M1MC 077 Specifications

General

Brand	Nordyne
Model	M1MC 077
Category	Furnace
Efficiency	80%
Fuel Type	Natural Gas
Voltage	115 V
Max Temp Rise	70°F
Shipping Weight	125 lbs
Heating Capacity	77000 BTU

Summary

Owners Manual Installation Instructions

4. INSTALLATION STANDARDS

6. MINIMUM CLEARANCES

Alcove Installations

Minimum 18" clearance at front of furnace shall be provided for future servicing.

9. ROOF JACK SELECTION

10. DUCT CONNECTOR SELECTION

11. INSTALLATION

12. INSTALLATION OF TRANSIT-MODE VENTING SYSTEM

13. ELECTRICAL WIRING

14. FUEL PIPING

16. LIGHTING AND SHUTDOWN GENERAL-ALL MODELS

Safety Information Before Lighting

Essential safety precautions to read before attempting to light the furnace.

Lighting Instructions for Standing Pilot Models

Step-by-step guide for manually lighting the pilot on standing pilot models.

GENERAL-DIRECT IGNITION MODELS

Operating Instructions for M1M Models with Direct Ignition

Specific operating instructions for M1M models equipped with direct ignition systems.

Operating Instructions for Oil and Gas Gun Furnaces

THE FURNACE CONTROLS AND FUNCTIONS

17. SERVICE GUIDE

Burner Adjustments

Procedures for adjusting burner settings for optimal performance, including gas pressure and pilot flame.

COMBUSTION AIR

GAS CONVERSION

Atmospheric and Direct Ignition Furnaces Gas Conversion

Step-by-step guide for converting atmospheric and direct ignition furnaces to LP gas.

TROUBLESHOOTING

Standing Pilot Models Troubleshooting

Common problems and solutions for standing pilot models, such as the main burner not coming on.

Control Module Status Indicators

TROUBLESHOOTING DIRECT IGNITION FURNACES INCLUDING GAS GUN

Burner Motor Does Not Run

Diagnosing why the burner motor is not running when the thermostat calls for heat.

Combustion Blower Does Run - No Flame

Troubleshooting steps when the combustion blower runs but there is no flame.

Control Module Powered - Ignitor Does Not Heat Up

Steps to take when the control module is powered but the ignitor is not heating up.

120 Volts Available At AMP Plug - Ignitor Does Not Heat Up

Diagnosing ignitor issues when 120 volts are available at the AMP plug.

Main Flame Ignites - Burner Locks Out

Troubleshooting reasons for burner lockout after the main flame ignites.

Burner Short Cycling

Addressing issues causing the burner to short cycle, with limit switches closed.

24 Volts Supplied To Gas Valve During Ignition

TROUBLESHOOTING - OIL GUN

Honeywell R7184 or Beckett 7505 Controls Only

Specific troubleshooting for oil gun furnaces with Honeywell R7184 or Beckett 7505 primary controls.

18. MAINTENANCE

20. WIRING DIAGRAMS