goodman furnace gmp075 3 manual

The Goodman GMP075-3 is a 75,000 BTU gas furnace designed for residential heating applications. This high-efficiency furnace features multi-speed blower operation, electronic ignition, safety controls, and compatibility with various thermostat systems. Below are key sections covering safety, installation, operation, maintenance, and troubleshooting.

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

Features at a Glance

Key components: Gas valve, heat exchanger, multi-speed blower motor, electronic ignition system, pressure switches, flame sensor, and control board.

Feature	Description
Heating Capacity	75,000 BTU/h input
Efficiency	80% AFUE rating
Blower Motor	Multi-speed PSC motor
Ignition System	Hot surface electronic ignition
Gas Type	Natural gas (convertible to LP)
Voltage	120V AC, 60Hz
Control System	Integrated furnace control board
Safety Devices	Flame rollout switch, pressure switches, limit switches
Venting	Category I venting required
Dimensions	Standard upflow configuration

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, clean area with adequate combustion air and service clearance.
Gas connection: Use approved gas pipe and fittings; pressure test for leaks.
Electrical: Connect to dedicated 120V circuit; proper grounding required.
Venting: Install approved vent pipe per local codes and manufacturer specifications.
Ductwork: Ensure proper sizing and sealing of supply and return ducts.

WARNING! Gas furnaces produce carbon monoxide; improper installation can be fatal. Installation must be performed by qualified technician.

First-Time Startup

Initial startup must be performed by qualified technician.

Verify all connections: Gas, electrical, venting, and ductwork.
Check gas pressure: Adjust manifold pressure to 3.5" WC for natural gas.
Test safety controls: Verify operation of all limit and safety switches.
Start furnace: Follow lighting instructions on unit or in manual.
Measure temperature rise: Ensure within specified range (35-65°F).
Check venting: Verify proper draft and combustion.

CAUTION! Do not operate without proper venting. Ensure combustion air requirements are met.

Technical Specifications

Model: GMP075-3
Heating Capacity: 75,000 BTU/h input
AFUE Rating: 80%
Gas Type: Natural Gas (field convertible to LP)
Electrical: 120V, 60Hz, 6.5 amps
Blower Speeds: Multi-speed for heating and continuous fan
Temperature Rise: 35-65°F
External Static Pressure: 0.1-0.5" WC
Vent Size: 4" or 5" diameter
Dimensions (HxWxD): 44" x 17.5" x 21"

Controls and Operation

Integrated control board manages all furnace functions. Thermostat controls heating cycles.

Control Board LED: Flashing patterns indicate system status and error codes.

Heating Operation: Thermostat calls for heat → inducer motor starts → pressure switch proves draft → hot surface igniter glows → gas valve opens → flame ignition → blower starts after heat exchanger warm-up.

Fan Operation: AUTO (cycles with heat) or ON (continuous operation).

Venting Requirements

Category I venting required. Must use approved vent materials.

Vent sizing: Minimum 4" diameter for lengths under 40 feet.
Vent slope: 1/4" per foot upward toward termination.
Termination: Must be at least 12 inches above ground level and clear of obstructions.
Combustion air: Provide adequate fresh air for proper combustion.

Tip: Vent pipes must be supported every 4 feet and sealed properly.

Maintenance Procedures

Annual maintenance by qualified technician recommended.

Air filter: Replace every 1-3 months depending on usage.
Heat exchanger: Inspect annually for cracks or damage.
Blower assembly: Clean blower wheel and housing annually.
Burners: Clean and inspect for proper flame pattern.
Vent system: Inspect for obstructions or deterioration.
Electrical: Check all connections and component operation.
Gas connections: Leak test annually.

WARNING! Turn off gas and electrical power before servicing. Only qualified personnel should perform maintenance.

Safety Features

Flame rollout switch: Shuts off gas if flame rolls out of burner compartment. Limit switches: Prevent overheating. Pressure switches: Prove proper vent draft before gas valve opens. Flame sensor: Confirms flame presence during operation.

Care & Cleaning

Keep area around furnace clean and clear of combustible materials. Clean or replace air filter regularly. Keep vent termination clear of snow, leaves, and debris.

CAUTION! Do not use furnace room for storage. Maintain minimum clearances specified in manual.

Regulatory Information

UL listed and ANSI certified. Complies with ANSI Z21.47 standards. Installation must comply with National Fuel Gas Code (NFPA 54), National Electrical Code (NFPA 70), and local building codes. For support, contact Goodman Manufacturing at 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, ensure door properly closed.
No heat	Gas supply, ignition	Verify gas valve on, check for error codes on control board.
Blower won't stop	Thermostat fan setting	Check thermostat fan setting (ON vs AUTO).
Furnace short cycles	Dirty filter, limit switch	Replace air filter, check for restricted airflow.
Error code flashing	Various system faults	Refer to LED flash code chart in manual or contact technician.

Reset: Turn power off for 30 seconds then restore. If problem persists, call technician.

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