Ignition Transformer Replacements
Finding suitable alternatives for obsolete ignition units.
Verification Required
Replacing ignition transformers involves more than just voltage matching. Electromagnetic Interference (EMI) from new solid-state igniters can disrupt flame signals. Always verify ignition success rates under various conditions.
Replacement List
| Brand | Discontinued Model | End of Life | Official Replacement | Key Differences | Interchange? | Action / Advice |
|---|---|---|---|---|---|---|
| Honeywell | Q652 (Solid State) | 2022-12-30 | ET401 / ET402 | Official replacement family. ET401 is 120V. Verify electrode gap and EMI interference. | Conditional | Select ET401/402 based on primary voltage. Test for flame detector interference. |
| Siemens | ZM 20/12 | Discontinued | Equivalent (Check Specs) | No official direct replacement. Match Primary V, Secondary kV/mA, Duty Cycle, Insulation. | No | Prioritize Burner OEM spares. Perform ignition test (cold/hot/worst-case). |
Priority Procurement & Maintenance Advice
- Honeywell Q652 → ET401/ET402: Use the official replacement family. Ensure voltage matches (120V vs 230V).
- General: If no official replacement exists (e.g., Siemens ZM), match specifications carefully: Voltage, Current, Duty Cycle, and Mounting.
- Testing: Schedule a re-commissioning window to test ignition reliability (cold start, hot restart).