50337 H.B. Smith Ignition Module Replacement – For G100, GB100, GV100 Series Boilers
🔍 Product Overview
The H.B. Smith 50337 Ignition Module is a direct OEM replacement for Fenwal models 35-655922-001 and 35-655927-001, providing dependable ignition control for H.B. Smith G100, GB100, and GV100 Series boilers.
This ignition control module ensures reliable burner ignition, proper sequencing, and safe operation of your boiler system.
It also replaces Hydrotherm BM-8814, BM8814, and 8814 modules, offering wide compatibility across multiple boiler platforms.
🌟 Key Features
✅ Direct OEM Replacement – Fits H.B. Smith G100, GB100, and GV100 boilers.
✅ Compatible Replacements – Replaces Fenwal 35-655922-001, 35-655927-001, and Hydrotherm BM-8814 models.
✅ Reliable Ignition Control – Provides consistent spark ignition and flame supervision.
✅ Compact 24 VAC Module – Easy to install and wire into existing control systems.
✅ High-Temperature Rated – Operates in ambient temperatures up to 176°F.
✅ Safe & Efficient Design – Integrated timing and purge sequence ensure stable operation.
⚙️ Technical Specifications
| Specification | Details |
|---|
| Part Number |
50337 |
| Brand |
H.B. Smith |
| Application |
G100, GB100, GV100 Boiler Series |
| Replaces |
Fenwal 35-655922-001, 35-655927-001; Hydrotherm BM-8814, BM8814, 8814 |
| Input Voltage |
24 VAC, 50/60 Hz, 300 mA |
| Gas Valve Output |
24 VAC, 2.0 A max |
| Ignitor Output |
120 VAC, 5.0 A max |
| Pre-Purge Time |
0 seconds |
| Inter-Purge Time |
0 seconds |
| Ignition Trial Time |
4 seconds |
| Heat-Up Time |
20 seconds |
| Ambient Temperature Range |
-40°F to +176°F (-40°C to +80°C) |
| Mounting Type |
Surface / Panel Mount |
| OEM / Aftermarket |
Genuine OEM Replacement |
⚠️ Common Symptoms (When Replacement Is Needed)
-
Boiler fails to ignite or intermittent ignition
-
Ignition spark present but no burner light-off
-
Delayed or erratic ignition cycle
-
Lockout or fault indication from ignition control
-
Burners extinguish shortly after firing
❓ Frequently Asked Questions (FAQ)
Q1: Which boilers does the H.B. Smith 50337 fit?
➡️ It fits H.B. Smith G100, GB100, and GV100 Series boilers.
Q2: What models does this replace?
➡️ It directly replaces Fenwal 35-655922-001, Fenwal 35-655927-001, and Hydrotherm BM-8814/BM8814/8814.
Q3: Does this module include purge or interpurge time?
➡️ No, both pre-purge and interpurge are set at 0 seconds per design.
Q4: What’s the ignition trial time?
➡️ 4 seconds per cycle, with a 20-second heat-up sequence.
Q5: Is this an OEM part?
➡️ Yes — this is a genuine H.B. Smith OEM replacement ignition module.
🛒 Shopping Tips
✅ Confirm your boiler model (G100, GB100, GV100) before ordering.
✅ Inspect wiring harness and connectors for wear before installing a new module.
✅ Replace any damaged ignitors or sensors simultaneously for best results.
✅ Keep a spare module on hand during peak heating season for minimal downtime.
