1. Product Overview
This document provides instructions for the installation, operation, and maintenance of the Acupress 24V Igniter Flame Rod Assembly. This component is designed as an aftermarket replacement for specific Honeywell Smart Valve systems.
The igniter is constructed from silicon nitride, engineered for efficient ignition and extended service life in demanding heating applications. It functions as a pilot igniter assembly, operating at 24 Volts.
Key Features:
- Voltage: 24V
- Material: Silicon Nitride
- Length: 30 inches
- Includes mounting clip and hardware
- Direct replacement for various Honeywell part numbers
Compatibility:
This igniter is specifically designed for 24V Honeywell Smart Valve systems, exclusively fitting SV9500 and SV9600 series.
Replacement Part Numbers: Honeywell 1009524, 1149856, 42640001, Q3400A, Q3400A1016, Q3400A1040, Q3450, Q3480, Q3620, SV9401, SV9402, SV9403, SV9500, SV9500M2603, SV9500M2674, SV9500M2682, SV9501, SV9501M2528, SV9502, SV9503, SV9600, SV9600H, SV9601, SV9602, AFN643, L43-724, 68012, IG9500, Q3400A1032 MM643KX.

Image 1.1: The Acupress 24V Igniter Flame Rod Assembly, including the igniter, wiring, connector, and mounting clip.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read these instructions thoroughly before installing or servicing this product.
- Always disconnect the electrical power supply to the appliance before attempting any installation, service, or maintenance.
- Ensure the gas supply to the appliance is turned off before working on the igniter.
- Wear appropriate personal protective equipment (PPE), such as gloves and eye protection.
- Only qualified personnel should perform installation and servicing of gas appliances.
- Verify all connections are secure and properly insulated after installation.
- Do not bypass any safety devices.
3. Setup and Installation
This igniter is designed for straightforward replacement of existing flame rod sensor igniters. Follow these steps carefully:
- Disconnect Power and Gas: Before beginning any work, ensure the main electrical power supply to the furnace or heating appliance is completely disconnected. Also, turn off the gas supply to the appliance.
- Access the Igniter: Locate the existing igniter within your furnace or heating system. This may require removing access panels.
- Remove Old Igniter: Carefully disconnect the wiring from the old igniter. Note the orientation and connection points for proper reinstallation. Remove any mounting hardware securing the old igniter and carefully extract it.
- Install New Igniter: Position the new Acupress igniter in the same location and orientation as the old one. Secure it using the provided mounting clip and hardware.
- Reconnect Wiring: Reconnect the wires from the new igniter to the appropriate terminals. Ensure connections are tight and secure. Use wire caps if necessary and rotate them tightly to ensure a good connection.
- Verify Installation: Double-check all connections and ensure the igniter is securely mounted and properly positioned.
- Restore Power and Gas: Once installation is complete and verified, restore the gas supply and then the electrical power to the appliance.
- Test Operation: Initiate a heating cycle to confirm the igniter functions correctly and the appliance operates as expected.

Image 3.1: A technician performing an igniter replacement within a furnace, demonstrating the typical installation environment. This device offers a reliable solution for issues like abnormal heating or igniter burnout.
4. Operating Instructions
The Acupress 24V Igniter Flame Rod Assembly operates automatically as part of your furnace or heating system's ignition sequence. When a call for heat is initiated, the control board sends a 24V signal to the igniter.
- The igniter heats up rapidly to a temperature sufficient to ignite the gas.
- Once the gas ignites, the flame rod senses the presence of the flame, signaling the control board to continue the heating cycle.
- The igniter then acts as a flame sensor, ensuring the flame is continuously present during operation.
No manual intervention is required for the operation of this component once correctly installed.
5. Maintenance
The Acupress 24V Igniter Flame Rod Assembly is designed for durability and reliable performance. Regular maintenance of the igniter itself is generally limited to periodic inspection.
- Annual Inspection: During routine furnace maintenance, visually inspect the igniter and flame rod for any signs of damage, cracks, or excessive carbon buildup.
- Cleaning: If minor carbon buildup is observed on the flame rod, it can be gently cleaned with fine-grit sandpaper or steel wool. Avoid harsh chemicals or abrasive cleaners that could damage the ceramic insulation.
- Replacement: If the igniter shows signs of significant wear, damage, or consistently fails to ignite, it should be replaced. Igniters are wear-and-tear components and have a finite lifespan.
Always ensure power and gas are disconnected before performing any inspection or cleaning.
6. Troubleshooting
If your heating system is experiencing issues related to ignition, consider the following troubleshooting steps:
- No Ignition/No Heat:
- Check if the igniter glows. If it does not glow, verify the 24V power supply to the igniter.
- Inspect the igniter for visible cracks or damage. A damaged igniter will not heat properly.
- Ensure all wiring connections are secure and free from corrosion.
- Igniter Glows but No Flame:
- Verify that the gas supply to the furnace is open.
- Check for obstructions in the burner assembly that might prevent gas flow.
- Ensure the igniter is positioned correctly to ignite the gas stream.
- Flame Ignites but Goes Out:
- This often indicates a problem with the flame sensing function of the flame rod.
- Inspect the flame rod for carbon buildup or corrosion, which can prevent it from sensing the flame. Clean if necessary.
- Ensure the flame rod is properly positioned within the flame.
If troubleshooting does not resolve the issue, or if you are unsure about any step, it is recommended to contact a qualified HVAC technician.
7. Specifications
| Specification | Value |
|---|---|
| Type | Pilot Igniter Assembly |
| Voltage | 24 V |
| Length | 30 inches |
| Time to Temperature | <17 seconds @ 120 +/- 1.0 VAC |
| Resistance | 34 - 64 Ohms |
| Minimum Temperature | 2192°F / 1200°C @ 98 Volts |
| Maximum Temperature | 2732°F / 1500°C @ 132 Volts |
| Steady State Current | 0.8 to 2.0 Amps maximum @ 120 Volts |
| Igniter Material | Silicon Nitride |
| Manufacturer | Acupress |
| Part Number | Q3450 1009524 Q3400A1040 |
| Date First Available | August 12, 2025 |

Image 7.1: Detailed view of the igniter's ceramic body, heating element, and electrical connector, highlighting its construction.
8. Warranty and Support
Acupress stands by the quality of its products. If you encounter any issues with your Acupress 24V Igniter Flame Rod Assembly, please refer to the following:
- Defective or Damaged Product: If the product is defective or damaged upon arrival, or if it does not function as expected, please contact the seller immediately.
- Assistance: The seller is committed to providing assistance to resolve any problems you may experience with the product.
For specific warranty terms and conditions, please refer to the purchase documentation or contact the seller directly.