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this is the official manufacturer-designated direct replacement limit switch
including those using the 239-43676-02C part number
restoring system functionality once the plenum temperature returns to the safe 100°F threshold
utilizing an automatic reset mechanism to protect the secondary heat exchanger and internal components from overheating
It should not be confused with a vent limiting device (vLimiter) which is installed in the vent connection to manage diaphragm relief
Robertshaw 620-406 Transformer this is the official manufacturer-designatedThe Robertshaw 620 406 is a heavy duty 208 240V to 24V HVAC transformer engineered for reliable step down power in demanding light commercial and residential control circuits. Rated at 40VA, this open frame transformer provides the stable secondary voltage output required to drive contactors, relays, and circuit boards without voltage sag. The foot mount design ensures a secure installation within furnace cabinets or air handler control boxes, making
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