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The Watts 0383020 (Model 740) is a high-capacity ASME Section IV water pressure relief valve specifically engineered for large-scale hot water space heating boilers
the HC38GE236 and HC38GE236A are technically identical and interchangeable without any performance loss or wiring changes
This OEM-spec gas furnace burner ensures optimal fuel-to-air ratios for reliable combustion in M1 furnace series and M7 furnace models
Common Questions & Technical Insights: Can I use this relay for 240V heaters
Carrier HH18HA226 Rollout Switch 328140-751 The Watts 0383020 (Model 740)The Carrier HH18HA226 Rollout Switch is a critical safety component designed for Carrier, Bryant, and Payne gas furnaces. Engineered to detect flame rollout conditionswhere burner flames escape the heat exchangerthis Single Pole Single Throw (SPST) switch protects the heating unit and surrounding structure from high temperature damage. This specific model triggers an open circuit at 320 degrees F, immediately interrupting the gas valve circuit to stop
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