Goodman Co Furnace GMVC95 Gas Manual

The Goodman GMVC95 is a high-efficiency gas furnace with 95% AFUE rating, variable-speed ECM blower motor, two-stage gas valve operation, durable aluminized steel heat exchanger, diagnostic LED light, multi-speed blower settings, direct vent system, and compatibility with most thermostats. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Technical Specifications 5. Controls and Settings 6. Venting System 7. Operating Instructions 8. Maintenance Procedures 9. Safety Features 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Two-stage gas valve, ECM variable-speed blower motor, aluminized steel heat exchanger, diagnostic LED, pressure switches, flame sensor, hot surface ignitor.

Feature	Description
AFUE Rating	95% Annual Fuel Utilization Efficiency
Gas Valve	Two-stage operation for improved efficiency
Blower Motor	Variable-speed ECM for quiet operation
Heat Exchanger	Aluminized steel construction
Diagnostic LED	Flashing code display for troubleshooting
Venting	PVC pipe compatible direct vent system
Pressure Switches	Safety verification of venting operation
Flame Sensor	Monitors burner flame presence
Ignition System	Hot surface ignitor for reliable startup
Filter Size	Standard 16x25x1 inch filter

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, clean area with proper clearance (minimum 1 inch from combustible materials).
Gas Connection: Use black iron pipe with proper thread sealant; pressure test for leaks.
Electrical: 120V AC power supply with proper grounding; dedicated circuit recommended.
Venting: PVC pipe system with proper slope and termination clearances.
Ductwork: Properly sized and sealed return and supply ducts.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Only qualified technicians should install.

First-Time Setup

Initial startup must be performed by qualified technician.

Verify all connections: Gas, electrical, venting, and ductwork.
Check gas pressure: Adjust manifold pressure to specifications (typically 3.5" WC natural gas).
Set blower speeds: Adjust cooling and heating speeds per installation requirements.
Test operation: Verify proper ignition sequence and flame operation.
Program thermostat: Compatible with most two-stage thermostats.

CAUTION! Never operate without proper venting and combustion air supply.

Technical Specifications

Model: GMVC95 Series
AFUE: 95%
Input BTU/H: 40,000 to 120,000 (varies by model)
Output BTU/H: 38,000 to 114,000 (varies by model)
Gas Type: Natural Gas (convertible to LP with kit)
Electrical: 120V, 60Hz, 1.5-7.5 amps
Blower Motor: ECM variable speed
Stages: Two-stage gas valve
Venting: 2" PVC pipe minimum
Warranty: Limited lifetime heat exchanger, 10-year parts

Controls and Settings

Integrated control board with diagnostic LED. Access door switch for service access.

Control Board: Monitors system operation, displays error codes via LED flashes.

Blower Speeds: Cooling, heating, and continuous fan speeds adjustable via control board dip switches. Gas Valve: Two-stage operation for efficient heating. Thermostat Connections: Standard R, W, Y, G, C terminals. Diagnostic Codes: LED flash patterns indicate specific system faults.

Venting System

Direct vent system using PVC pipe for both intake and exhaust.

Pipe Material: Schedule 40 PVC or equivalent
Minimum Size: 2-inch diameter
Slope: 1/4 inch per foot toward furnace
Termination: Minimum 12 inches above ground, 12 inches from openings
Clearances: Follow local codes and manufacturer specifications

Tip: Ensure vent pipes are properly supported and sealed against weather.

Operating Instructions

Operate via compatible thermostat with heating and fan controls.

Thermostat Setting: Set to HEAT mode and desired temperature.
Startup Sequence: Inducer motor starts, pressure switch verifies, ignitor heats, gas valve opens.
Normal Operation: Two-stage heating with variable blower speed.
Shutdown: Gas valve closes, blower continues for post-purge.
Continuous Fan: Available for air circulation without heating.

WARNING! Install carbon monoxide detectors near sleeping areas when using gas appliances.

Maintenance Procedures

Annual professional maintenance recommended.

Filter Replacement: Monthly during heating season; use 16x25x1 filter.
Visual Inspection: Check vent system, burners, and heat exchanger.
Cleaning: Vacuum burners and blower compartment annually.
Testing: Verify safety controls and gas pressure.
Lubrication: ECM motor requires no lubrication.

CAUTION! Turn off power and gas supply before performing any maintenance.

Safety Features

Multiple safety systems: Flame rollout switches, high limit switches, pressure switches, flame sensor, ignitor control.

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for US and Canada. UL listed. Complies with Department of Energy efficiency standards. Manufactured by Goodman Manufacturing Company, L.P. For technical support, contact 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat settings, door switch engagement.
No heat	Gas supply, ignitor, flame sensor	Verify gas valve on, check for dirty flame sensor, test ignitor.
Short cycling	Filter, limit switch, venting	Replace dirty filter, check for blocked vents, verify limit switch operation.
Blower not running	Motor, capacitor, control board	Check for power to blower, test motor operation, verify control signals.
Lockout mode	Safety device tripped	Reset power, check diagnostic LED for error codes, address underlying issue.

Reset Procedure: Turn thermostat off, turn furnace power off for 30 seconds, restore power.

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