Goodman Furnace Installation Manual GMVM96

The Goodman GMVM96 is a high-efficiency gas furnace with variable-speed ECM blower motor, AFUE rating up to 96%, multi-speed operation, sealed combustion system, diagnostic LED light, pressure switch safety controls, and compatibility with various thermostat systems. This manual covers safety precautions, installation procedures, wiring diagrams, start-up procedures, maintenance guidelines, and troubleshooting information for proper installation and operation.

Features at a Glance

Key components: Variable-speed ECM blower, sealed combustion system, hot surface igniter, flame sensor, pressure switches, diagnostic LED, multi-position installation capability.

Safety Precautions

Follow all safety codes and manufacturer instructions during installation.

1. Disconnect electrical power before servicing or installing.
2. Verify gas type matches furnace rating plate (natural gas or propane).
3. Ensure proper combustion air and ventilation requirements are met.
4. Install carbon monoxide detectors in living spaces.
5. Follow all local building and mechanical codes.

WARNING! Failure to follow safety precautions may result in fire, explosion, property damage, personal injury, or death. Gas furnaces must be installed by qualified technicians.

Installation Requirements

Proper installation ensures safe and efficient operation.

1. Location: Install in approved locations with adequate clearance for service access.
2. Combustion Air: Provide adequate combustion and ventilation air per code requirements.
3. Venting: Install PVC vent pipes according to manufacturer specifications.
4. Gas Supply: Properly sized gas line with sediment trap and shut-off valve.
5. Electrical: 120V AC power supply with proper grounding and disconnect.
6. Ductwork: Properly sized and sealed duct system for optimal airflow.

CAUTION! Never install furnace in sleeping rooms, bathrooms, or hazardous locations.

Specifications

• Model: GMVM96 Series
• Input BTU/H: 40,000 to 120,000 (varies by model)
• AFUE: Up to 96%
• Gas Type: Natural Gas or LP (propane)
• Electrical: 120V AC, 60Hz
• Blower Motor: Variable-speed ECM
• Venting: PVC, CPVC, or ABS (check local codes)
• Manifold Pressure: Natural Gas: 3.5" W.C.; LP: 10" W.C.
• Dimensions: Varies by model (check specific model data)
• Warranty: Limited lifetime heat exchanger, 10-year parts

Wiring and Electrical

Follow NEC and local electrical codes. Furnace requires 120V AC power supply.

Electrical Connections: Line voltage (120V) to furnace, low voltage (24V) to thermostat.

Thermostat: Connect R, C, W, G, Y terminals according to wiring diagram. Blower: ECM motor with variable speed control. Safety Controls: Limit switches, pressure switches, flame sensor. Diagnostic LED: Flashing codes for troubleshooting.

Venting and Combustion Air

PVC venting system for sealed combustion operation.

1. Vent Pipe: Use approved PVC, CPVC, or ABS pipe per local codes.
2. Vent Termination: Maintain proper clearances from windows, doors, and air intakes.
3. Combustion Air: Provide separate combustion air intake pipe.
4. Slope: Vent pipes should slope back toward furnace for condensate drainage.
5. Support: Secure vent pipes with appropriate hangers and supports.

Tip: Always perform combustion analysis after installation to verify proper venting.

Gas Piping Connections

Proper gas piping ensures safe and reliable operation.

1. Pipe Sizing: Size gas line according to length and BTU requirements.
2. Sediment Trap: Install drip leg before gas valve connection.
3. Shut-off Valve: Install approved gas shut-off valve within 6 feet of furnace.
4. Leak Test: Test all connections with bubble solution or electronic detector.
5. Pressure Test: Verify manifold pressure matches rating plate specifications.

WARNING! Never use matches or open flames to check for gas leaks. Use approved leak detection methods only.

Start-Up and Commissioning

Complete start-up procedure ensures proper furnace operation.

1. Verify all connections: Electrical, gas, venting, and air ducts.
2. Check gas pressure: Adjust manifold pressure if necessary.
3. Start furnace: Follow proper lighting sequence.
4. Check operation: Verify all safety controls function properly.
5. Measure temperatures: Check temperature rise against specifications.
6. Combustion analysis: Measure CO and O2 levels in flue gases.
7. Blower operation: Verify proper airflow and static pressure.
8. Customer orientation: Explain operation and maintenance requirements.

CAUTION! Never bypass safety controls during start-up or testing.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

Annual maintenance includes: Filter replacement, blower cleaning, heat exchanger inspection, flame sensor cleaning, burners inspection, vent system check, safety control testing, and combustion analysis.

CAUTION! Always disconnect electrical power before performing maintenance. Only qualified technicians should service gas furnaces.

Regulatory Information

UL listed and ANSI certified. Complies with ANSI Z21.47/CSA 2.3 standards. Installation must comply with National Fuel Gas Code (NFPA 54), National Electrical Code (NFPA 70), and all local building codes. For technical support, contact Goodman Manufacturing at 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

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

Service: 1-877-466-8626; www.goodmanmfg.com