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the 18G89 is technically identical to the 18G8901 part number
It includes two pilot diaphragms and the pilot valve seat capsule
preventing air binding in your steam system
providing stable liquid flow control even during fluctuating load conditions
Carrier HH18HA202 Rollout Switch 30067439-890 the 18G89 is technically identicalThe 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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