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This is a standard flange mount relay
the RDB160BNU is powered by the same AC 24 V source as the fan coil controller
Professional-grade climate control begins with the Peco Controls TB155-048
It operates on 24V AC low voltage systems and is fully compatible with millivolt heating applications
Resideo L4006E1117 Aquastat Controller 321702-401 This is a standard flangeThe Resideo L4006E1117 Aquastat Controller is a professional grade high limit manual reset immersion device engineered for precision liquid temperature regulation in hydronic systems, boilers, and storage tanks. Featuring an SPST switch that reliably breaks the circuit on temperature rise, this controller is a critical safety component to prevent equipment overheating. The unit is equipped with a 3 8" x 2 7 8" copper bulb and a 1 1 2" capillary,