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8 inches in height
The McDonnell & Miller 250-3/4-15 is a high-performance 3/4" NPT Pressure Relief Valve engineered for critical over-pressure protection in hydronic heating systems and storage tanks
but at this 150 psi setpoint
the 72942 is built to handle a maximum operating pressure of 125 psig and temperatures up to 353°F
Schneider Electric (Viconics) R820-623 Power Control 318423-701 8 inches in heightThe Schneider Electric (Viconics) R820 623 Power Control is a rugged, microprocessor based SCR Power Controller designed for precise modulation of electric heating loads in commercial and industrial HVACR systems. Rated for 24 600 Vac 3 phase applications with a 25 Amp capacity, this controller utilizes advanced Silicon Controlled Rectifier technology to deliver stable power to duct heaters, baseboards, and fan coil units. Its zero cross firing mode