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or cracked pressure tubing
the 18G89 is technically identical to the 18G8901 part number
It includes two pilot diaphragms and the pilot valve seat capsule
This heavy-duty SPDT thermostat features a snap-acting switch that provides reliable two-position (on/off) control
Carrier HH18HA202 Rollout Switch 30067439-890 or cracked pressure tubingThe Carrier HH18HA202 Rollout Switch is a critical safety component designed for gas fired furnaces and heating systems. Engineered as a manual reset limit switch, this SPST (Single Pole Single Throw) device is calibrated to open the circuit at a fixed 350 degrees F. When excessive heat is detectedtypically indicating a flame rollout condition or heat exchanger breachthe switch interrupts the 24V control circuit to shut down the gas valve immediately.
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