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this switch is "normally closed" and should show near-zero resistance
Its robust construction and standardized mounting make it an essential furnace safety switch for maintaining equipment uptime and protecting the heat exchanger from excessive thermal stress
Replacing the 22-133 is recommended whenever a device is unmounted to ensure a fresh
heat-resistant elastomer materials capable of withstanding the thermal cycling common in Lochinvar Knight and Armor water heater applications
Johnson Controls KNB26A-600R Knob this switch is "normally closed"The Johnson Controls KNB26A 600R is a field replaceable thermostat adjustment knob specifically engineered for Penn T26, W43, and W45 series controls. This HVAC replacement part is essential for restoring precise setpoint control on heavy duty line voltage thermostats and humidistats equipped with plastic covers. Built from durable, high impact plastic, the KNB26A 600R knob assembly includes the integrated trim disc, ensuring a flush fit and