Nordyne MMHA-070A AA FC-02 User Manual

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Nordyne MMHA-070A AA FC-02 Specifications

General

BTU	70, 000
AFUE Rating	80%
Weight	120 lbs
Gas Type	Natural Gas
Vent Diameter	4 inches

Summary

Limited Warranty

Warranty Limitations and Exclusions

Details items not covered, limitations on claims, and specific exclusions.

Warranty Coverage Details

Outlines parts/labor coverage, heat exchanger, trade-in options, and service claim procedures.

Owner's Responsibilities

Warranty Compliance

Details homeowner duties for proper setup, conversion, and maintenance.

Installation Standards

Unit Location and Clearances

Electrical Wiring

Electrical Power Supply Connections

Instructions for connecting the main power supply wires to the furnace junction box.

Thermostat Wiring Instructions

Guides on connecting low-voltage thermostat wires to the furnace control panel.

Fuel Piping

Gas Piping Installation and Conversion

Lighting and Shutdown Procedures

Safety Information Before Lighting

Critical safety warnings and steps to take if gas is smelled before lighting.

Standing Pilot Lighting Instructions

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

Furnace Operation Sequences

Standing Pilot Operation Sequence

Induced Draft Pilot Operation Sequence

Direct Ignition and Gun Furnace Operation

MM Direct Ignition Furnace Operation

Operating instructions for MM models with automatic direct ignition system.

Oil and Gas Gun Furnace Operation

Furnace Troubleshooting and Safety

Direct Ignition Furnace Safety

Safety warnings and procedures specific to direct ignition models, including gas leak response.

Gas Gun Model Operation

Furnace Controls and Functions

Service Guide and Adjustments

Burner Adjustment Procedures

Troubleshooting Standing Pilot Models

Troubleshooting Pilot and Main Burner

Solutions for issues like no main burner, no main flame, or pilot not lighting/going out.

Burner Performance and Gas Bills

Troubleshooting Direct Ignition Models

Troubleshooting Ignition and Motor

Diagnosing issues with burner motor not running, short cycling, and ignition problems.

Advanced Troubleshooting and Maintenance

Control Module and Ignitor Issues

Diagnosing problems with the control module, ignitor, and flame sensing.

Burner and Blower Operation Issues

Resolving faults like no flame with blower running, insufficient heat, and blower faults.

Furnace Maintenance Procedures

Wiring Diagrams

Gas Atmospheric Wiring Diagram

Electrical schematic for MGHA 056, 070, 077 gas atmospheric furnaces.

Gas Atmospheric MGHB/MGBB Wiring Diagram

Electrical schematic for MGHB/MGBB gas atmospheric furnaces.

Gas Atmospheric MGHB 077 Diagram

Electrical schematic for the MGHB 077 gas atmospheric furnace.

Standing Pilot Induced Draft Wiring Diagram

Electrical schematic for standing pilot furnaces with induced draft.

Standing Pilot MGHA 090 PQ Wiring Diagram

Electrical schematic for the MGHA 090 PQ standing pilot furnace.

Installation Supplement for Specific Models