Manual for Bard Furnace EFC5 or EFC10

The Bard EFC5 and EFC10 furnaces are high-efficiency gas furnaces designed for residential and light commercial applications. These models feature advanced combustion technology, variable-speed blowers, and energy-efficient operation. Below are key sections covering safety, features, installation, operation, maintenance, and troubleshooting for both EFC5 and EFC10 furnace models.

Features at a Glance

Key components: High-efficiency heat exchanger, variable-speed ECM blower motor, electronic ignition system, multi-speed gas valve, integrated control board.

Installation

Unpack and inspect all components. Ensure proper clearances and location requirements.

1. Position furnace: Place on level surface with proper clearances (minimum 1 inch from combustible materials).
2. Gas connection: Use approved gas piping with drip leg and sediment trap.
3. Electrical connection: Connect to 120V AC power with proper grounding.
4. Venting: Install PVC vent pipes according to local codes and manufacturer specifications.
5. Drain lines: Connect condensate drain to proper drainage system.
6. Ductwork: Connect supply and return ducts with proper sealing.

WARNING! Gas furnaces must be installed by qualified HVAC technicians only. Follow all local codes and manufacturer specifications.

First-Time Setup

Complete installation verification and initial startup procedure.

1. Gas pressure check: Verify inlet and manifold gas pressures are within specifications.
2. Venting verification: Confirm proper draft and venting operation.
3. Electrical checks: Verify proper voltage and grounding.
4. Control settings: Set dip switches for proper blower speeds and system configuration.
5. Initial startup: Follow step-by-step ignition sequence and verify proper operation.
6. Temperature rise: Measure and adjust to ensure proper airflow and heating performance.

CAUTION! Never bypass safety controls or operate furnace without proper venting.

Specifications

• Models: EFC5 and EFC10 series gas furnaces
• Input Capacity: 40,000 to 120,000 BTU/h (varies by model)
• AFUE Rating: Up to 96% efficiency
• Gas Type: Natural gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 1.5-3.0 amps
• Blower Type: Variable-speed ECM
• Venting: PVC pipe (2-3 inch diameter)
• Operating Temp Range: -30°F to 150°F ambient
• Warranty: Limited lifetime heat exchanger, 10-year parts

Controls and Settings

Integrated control board with LED status indicators and diagnostic codes.

Control Board Features: Power indicator, status LED, diagnostic flash codes, dip switch settings for blower speeds and system configuration.

Operating Modes: Heat, Fan Only, Off. Blower Speeds: Adjustable for heating and continuous fan operation. Temperature Control: Compatible with standard 24V thermostats. Safety Features: Flame rollout switches, high limit switches, pressure switches, flame sensor. Diagnostic Codes: Flash patterns indicate specific operational status and fault conditions.

Connecting to HVAC System

Integration with existing HVAC components and thermostat wiring.

1. Thermostat connection: Standard 5-wire thermostat cable (R, W, G, Y, C).
2. Humidifier: Optional connection for powered humidifier.
3. Air cleaner: Compatible with electronic air cleaners.
4. Zoning systems: Can be integrated with zoning control panels.
5. AC compatibility: Designed for use with matching Bard air conditioning systems.

Tip: Always turn off power at disconnect switch before making electrical connections.

Operation

Normal heating cycle operation and user controls.

1. Thermostat call: Set thermostat to desired temperature above room temperature.
2. Ignition sequence: Control board initiates pre-purge, ignition, and flame verification.
3. Heating cycle: Gas valve opens, burner ignites, heat exchanger warms, blower activates.
4. Fan operation: Blower runs during heating cycle and continues during post-purge.
5. Cycle completion: Thermostat satisfied, gas valve closes, blower continues for cool-down.
6. Continuous fan: Optional fan-only operation for air circulation.

WARNING! Never attempt to adjust gas pressure or bypass safety controls.

Maintenance Procedures

Regular maintenance schedule for optimal performance and safety.

1. Monthly: Check air filter, clean if reusable or replace if disposable.
2. Seasonal: Inspect burners, heat exchanger, and flame sensor.
3. Annual: Professional inspection of gas pressure, heat exchanger, venting, and safety controls.
4. As needed: Clean condensate drain system and trap.
5. Blower maintenance: Clean blower wheel and housing annually.

Care & Cleaning

Turn off power and gas supply before cleaning. Use soft brush and vacuum for dust removal.

CAUTION! Do not use water or liquid cleaners on electrical components. Keep combustion area clear of debris.

Regulatory Information

UL listed and ANSI certified for safety and performance. Complies with ASHRAE standards for residential gas furnaces. Manufactured to meet or exceed DOE energy efficiency requirements. For technical support, contact Bard Manufacturing at 1-800-356-1535 or visit www.bardhvac.com.

Troubleshooting

Reset Procedure: Turn power off for 30 seconds, then restore power to reset control board.

Service: 1-800-356-1535; www.bardhvac.com