Nordyne M1M Furnace Manual

The Nordyne M1M Furnace is a high-efficiency gas furnace designed for residential heating applications. This manual covers the M1M series with features including multi-speed blower operation, electronic ignition, diagnostic LED system, safety controls, and compatibility with various thermostat types. Below are key sections for safety, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. Initial Setup & Startup 4. Technical Specifications 5. Controls & Operation 6. Venting & Combustion Air 7. Maintenance Procedures 8. Safety Features 10. Regulatory Information 11. Troubleshooting Guide

Features at a Glance

Key components: Gas valve, heat exchanger, blower assembly, control board, pressure switches, igniter, flame sensor.

Feature	Description
Multi-speed blower	Variable speed operation for optimal airflow
Electronic ignition	Hot surface igniter for reliable startup
Diagnostic LED	Flashing codes for troubleshooting
Safety controls	Pressure switches, rollout switches, flame sensor
Gas valve	Regulates natural gas or propane flow
Heat exchanger	Stainless steel construction for efficiency
Filter access	Easy-access filter compartment
Control board	Integrated furnace controller
Thermostat connections	Standard 24V thermostat terminals
Service switches	Power disconnect and door safety switch

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, clean area with adequate clearance for service access.
Venting: Properly size and install vent pipes according to manufacturer specifications.
Gas supply: Connect to appropriate gas line with shutoff valve.
Electrical: Connect to 120V AC power with proper grounding.
Ductwork: Ensure proper sizing and sealing of supply/return ducts.

WARNING! Gas appliances can be hazardous; installation must comply with all local codes and regulations.

Initial Setup & Startup

Complete installation verification before initial startup.

Gas pressure check: Verify inlet and manifold pressures are within specifications.
Venting verification: Confirm proper draft and vent pipe integrity.
Electrical connections: Check all wiring for proper connections and grounding.
Thermostat setup: Connect compatible thermostat and set heating mode.
Initial startup: Follow lighting instructions; observe first heating cycle.

CAUTION! Only qualified technicians should perform startup procedures.

Technical Specifications

Input Capacity: 40,000 - 120,000 BTU/hr (model dependent)
Efficiency: 80% AFUE minimum
Gas Type: Natural gas or propane (conversion kit required)
Electrical: 120V AC, 60Hz, 15A circuit
Blower Motor: Multi-speed PSC or ECM
Venting: Category I, PVC or metal vent pipe
Dimensions: Varies by model (check specific model data)
Operating Temp Range: -30°F to 150°F ambient
Warranty: Limited lifetime heat exchanger, 5-year parts

Controls & Operation

Access control board via front panel removal. Thermostat controls heating cycles.

Control Board: Diagnostic LED, terminal connections, dip switches for configuration.

Operation Sequence: Thermostat call for heat → inducer motor starts → pressure switch proves → igniter heats → gas valve opens → flame sensor confirms → blower starts after delay.

Settings: Blower speeds (heating/cooling), temperature rise adjustment, fan on/off delays.

Venting & Combustion Air

Proper venting critical for safe operation. Category I venting required.

Vent pipe sizing: Follow manufacturer specifications for pipe diameter and length.
Combustion air: Ensure adequate fresh air supply for proper combustion.
Vent termination: Locate according to clearance requirements from windows, doors.
Condensate drainage: Properly route and trap condensate line.

Tip: Regular inspection of vent system prevents blockage and ensures safety.

Maintenance Procedures

Annual professional maintenance recommended. Monthly filter changes.

Filter replacement: Replace standard 1-inch filter monthly during heating season.
Blower cleaning: Vacuum blower wheel and compartment annually.
Heat exchanger inspection: Visual inspection for cracks or damage.
Flame sensor cleaning: Light sanding to remove carbon buildup.
Drain system: Clear condensate trap and drain line.
Safety check: Test all safety controls and gas pressure.

WARNING! Disconnect power before performing any maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Device	Function
Flame rollout switch	Detects flame outside combustion chamber
Pressure switches	Verify proper venting airflow
Flame sensor	Confirms burner ignition
High limit switch	Prevents overheating
Gas valve	Automatic shutoff if flame not detected
Door safety switch	Disables operation when panel removed

Regulatory Information

ANSI Z21.47: Certified for US and Canadian standards. CSA International approved. UL listed. Installation must comply with National Fuel Gas Code (NFPA 54) and local building codes. For technical support, contact Nordyne at 1-800-422-4328 or visit www.nordyne.com.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat settings, door panel secure
No heat	Gas supply, igniter, flame sensor	Verify gas valve on, check igniter operation, clean flame sensor
Short cycling	Dirty filter, high limit	Replace filter, check airflow, verify limit switch operation
Blower won't run	Motor, capacitor, control board	Check motor voltage, test capacitor, verify control signals
Lockout condition	Safety device tripped	Reset power, check diagnostic LED codes, clear fault
Unusual noises	Blower, inducer, ductwork	Inspect blower wheel, check inducer motor, examine duct connections

Diagnostic Codes: Refer to control board LED flash patterns for specific error codes.

Service: 1-800-422-4328; www.nordyne.com