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it is also a field-proven substitute for multiple OEM models including Heil-Quaker 610672 and Rheem-Ruud 51-21504-01
Using it on lower BTU models will result in over-firing and potential manifold failure
ensuring reliable open/close cycles under pressure
failing to open/close completely
the burner internal geometry may be compromised
Carrier HH18HA199 Limit Switch R-134A it is also a field-provenThe Carrier HH18HA199 Limit Switch is a critical safety component designed for high temperature monitoring in HVAC induction combustion furnaces and residential heating systems. This genuine OEM replacement part is calibrated to trigger at a fixed 200 degree opening temperature, automatically interrupting the electrical circuit via its SPST (Single Pole Single Throw) configuration to prevent heat exchanger damage or hazardous rollout conditions.
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