Guardian Furnace Model GGLs080B12MP11A Manual

The Guardian GGLs080B12MP11A is an 80,000 BTU high-efficiency gas furnace designed for residential heating applications. This natural gas furnace features multi-speed blower operation, electronic ignition, safety shut-off controls, and compatibility with standard 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 and Combustion Air 7. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Multi-speed direct drive blower, hot surface ignition, aluminized steel heat exchanger, integrated control board, pressure switches, flame sensor, and limit controls.

Feature	Description
Heating Capacity	80,000 BTU/H input
Efficiency Rating	80% AFUE
Blower Motor	Multi-speed PSC
Ignition System	Hot surface electronic ignition
Gas Type	Natural gas
Venting	Category I vertical or horizontal
Electrical Requirements	120V AC, 60Hz
Control Voltage	24V AC
Filter Size	16x25x1 inch
Warranty	20-year heat exchanger limited warranty

Installation Requirements

Professional installation required. Ensure proper clearances and local code compliance.

Location: Install in dry, clean area with adequate combustion air and service access.
Clearances: Maintain 1-inch clearance from combustible materials on sides and rear.
Gas Connection: Use black iron pipe with proper thread sealant; install shut-off valve.
Electrical: Connect to dedicated 120V circuit; install disconnect switch within sight.
Venting: Install approved Category I vent pipe with proper slope and termination.

WARNING! Gas appliances can produce carbon monoxide. Proper installation and venting are critical for safety. Installation must comply with local codes and NFPA 54.

First-Time Setup

Complete installation verification before initial startup.

Gas pressure check: Verify manifold pressure at 3.5" WC for natural gas.
Venting inspection: Ensure proper vent pipe installation and clearances.
Electrical connections: Verify proper grounding and polarity.
Thermostat wiring: Connect R, W, G, C terminals as required.
Initial startup: Follow lighting instructions on furnace door.

CAUTION! Only qualified HVAC technicians should perform installation and startup procedures.

Technical Specifications

Model: GGLs080B12MP11A
Heating Capacity: 80,000 BTU/H input
AFUE Rating: 80%
Gas Type: Natural Gas
Manifold Pressure: 3.5" WC
Blower Speeds: Multi-speed (CFM adjustable)
Electrical: 120V/60Hz/1Ph
Maximum External Static Pressure: 0.5" WC
Vent Size: 4-inch diameter
Dimensions (HxWxD): 44" x 17.5" x 21"
Shipping Weight: 125 lbs

Controls and Operation

Integrated control board manages all furnace operations with LED status indicator.

Control Board LED Codes: Steady ON = Normal operation; 1 Flash = Pressure switch error; 2 Flashes = Ignition lockout; 3 Flashes = Limit circuit lockout; 4 Flashes = Flame sense error.

Thermostat Operation: Connect standard 24V thermostat to R, W, G terminals. System operates on call for heat from thermostat.

Blower Speeds: Adjust blower speed taps for proper airflow (COOL, HEAT LOW, HEAT HIGH).

Venting and Combustion Air

Category I venting system required. Ensure proper combustion air supply.

Vent Pipe: Use approved Type B vent pipe or listed flexible vent material.
Vent Termination: Maintain proper clearances from windows, doors, and air intakes.
Combustion Air: Provide adequate combustion air per local codes (typically 1 sq inch per 1000 BTU).
Draft Verification: Check draft hood operation and spillage during operation.

Tip: Install carbon monoxide detectors in sleeping areas and near furnace location.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

Monthly: Check and replace air filter if dirty.
Annual: Professional inspection and cleaning recommended.
Burner Inspection: Clean burners and check for proper flame pattern.
Heat Exchanger: Visual inspection for cracks or damage.
Blower Assembly: Clean blower wheel and housing.
Vent System: Inspect for obstructions or deterioration.
Safety Controls: Test limit switches and pressure controls.
Gas Connections: Check for leaks with bubble solution.

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

Care & Cleaning

Keep furnace area clean and free of combustible materials.

Air Filter: Replace 1-inch disposable filter every 1-3 months during heating season.

Exterior: Wipe with damp cloth only; do not use chemical cleaners.

Vent Terminal: Keep clear of snow, leaves, and debris.

CAUTION! Do not attempt to clean internal components without proper training. Contact qualified technician.

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for natural gas operation. UL listed. Installation must comply with National Fuel Gas Code NFPA 54/ANSI Z223.1 and local building codes. For technical support, contact Guardian Customer Service at 1-800-XXX-XXXX or visit www.guardianheating.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat setting, ensure door properly closed.
No heat	Gas supply, ignition	Verify gas valve on, check for ignition attempts, inspect flame sensor.
Short cycling	Dirty filter, airflow	Replace air filter, check for blocked vents or registers.
Blower won't stop	Thermostat fan setting	Check thermostat fan setting (should be AUTO, not ON).
Unusual noises	Blower, ductwork	Inspect blower wheel, check for loose panels or duct connections.
Lockout condition	Safety controls	Reset power, check LED error code, call for service if persistent.

Reset Procedure: Turn thermostat to lowest setting, turn off power for 30 seconds, restore power, set thermostat to desired temperature.

Service: 1-800-XXX-XXXX; www.guardianheating.com