Note that both upper and lower thermostats should be set to the same temperature to maintain a uniform tank profile

Isolated Coil Circuit: 4-terminal design allows for independent control of the coil circuit from the power circuit

the 40-amp rating exceeds 30A requirements

eliminating the need for makeshift mounting solutions

EWC Controls PRD 10" Pressure Regulating Damper Els PW 17895 Note that both upper andEWC Controls PRD 10" Pressure Regulating Damper Made in USA. Model PRD RD pressure regulating damper is a single blade, round variation of a barometric relief damper. This is the simplest, most economical way of bypassing excess static pressure in multi zone applications. Resistance is controlled by offsetting the arm and adjusting the weights. The arm can be inserted into either side of the damper for added versatility.