Monarch Add A Furnace AF324A Manual

The Monarch Add A Furnace AF324A is a high-efficiency gas furnace designed for residential heating applications. This unit features a 34,000 BTU output capacity, electronic ignition, variable-speed blower motor, multi-position installation capability, durable aluminized steel heat exchanger, and energy-efficient operation with AFUE rating up to 95%. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Aluminized steel heat exchanger, electronic ignition system, variable-speed blower motor, multi-position configuration, integrated control board, gas valve, pressure switches, flame sensor.

Installation

Unpack and inspect contents. Ensure proper clearances and location.

1. Position furnace: Select appropriate location with proper clearances (minimum 1 inch from combustible materials).
2. Connect gas supply: Use approved gas piping; pressure test for leaks.
3. Connect electrical: 120V AC power supply with proper grounding.
4. Connect venting: Use PVC piping for intake and exhaust.
5. Connect ductwork: Secure supply and return air ducts.
6. Install thermostat: Connect compatible 24V thermostat.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Setup

Power on furnace; follow startup procedure.

1. Verify gas supply: Ensure gas valve is open and pressure is correct.
2. Check electrical: Confirm 120V power and thermostat connections.
3. Set thermostat: Program desired temperature settings.
4. Test operation: Initiate heating cycle and monitor performance.
5. Adjust blower speed: Set appropriate CFM for your duct system.
6. Verify safety controls: Confirm proper operation of all safety devices.

CAUTION! Never bypass safety controls. Ensure proper ventilation.

Specifications

• Heating Capacity: 34,000 BTU/H
• AFUE Rating: Up to 95%
• Gas Type: Natural Gas
• Electrical: 120V AC, 60Hz
• Blower Motor: Variable-speed ECM
• Heat Exchanger: Aluminized steel
• Venting: PVC (2-inch recommended)
• Dimensions: 17.5" W x 21" D x 40" H
• Weight: 98 lbs
• Operating Temp Range: -30°F to 120°F

Controls and Settings

Access control board via front panel. Thermostat controls heating operation.

Control Board LEDs: Power (green), Heat (yellow), Error (red blinking codes).

Temperature Control: Set via thermostat. Blower Settings: Adjust dip switches for CFM. Gas Pressure: Factory set (do not adjust). Safety Controls: Automatic shutoff for high temperature, pressure issues, flame failure. Error Codes: LED flash patterns indicate specific issues (refer to troubleshooting section).

Connecting to HVAC System

Ductwork: Supply and return air connections. Electrical: 120V power and thermostat wiring. Gas: 1/2-inch gas line connection. Venting: PVC intake and exhaust.

1. Turn off power and gas supply before connecting.
2. Match connections to appropriate ports (gas, electrical, vent).
3. Seal all duct connections with approved tape or mastic.
4. Test all connections for leaks and proper operation.

Tip: Use pipe thread sealant on gas connections. Ensure vent pipes slope upward away from furnace.

Operation

Heating cycle controlled by thermostat.

1. Call for heat: Thermostat signals furnace to start.
2. Pre-purge: Blower operates to clear combustion chamber.
3. Ignition: Hot surface igniter glows, gas valve opens.
4. Flame verification: Flame sensor confirms ignition.
5. Heating: Main burner operates, heat exchanger warms.
6. Blower activation: Circulates warm air through ducts.
7. Cycle completion: Thermostat satisfied, system shuts down.
8. Post-purge: Blower operates to remove residual heat.

WARNING! Never operate without proper venting. Monitor for unusual noises or odors.

Maintenance

Regular maintenance ensures optimal performance and safety.

1. Monthly: Check and replace air filter if dirty.
2. Seasonal: Inspect vent system for obstructions.
3. Annual: Professional inspection and cleaning.
4. As needed: Clean flame sensor and burners.
5. Monitor: Check for error codes and unusual operation.

Care & Cleaning

Turn off power before cleaning. Use soft brush and vacuum for internal components.

CAUTION! Do not use water or liquid cleaners. Keep electrical components dry. Wear protective gloves when handling sharp components.

Regulatory Information

ANSI Z21.47: Certified for natural gas operation. UL listed for safety. Meets DOE efficiency standards. Copyright © 2025 Monarch Heating Systems; all rights reserved. For technical support, visit www.monarchheating.com or contact 1-800-555-HEAT.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore.

Service: 1-800-555-HEAT; www.monarchheating.com