Armstrong Rada 425R Thermostatic Central Recirculation System Control

Water Temperature Control—Recirculation Systems—Thermostatic

Rada 425R

Rada Thermostatic Mixing Valve is designed specifically to be installed as the primary control valve within a pumped recirculation system. Capable of maintaining safe, accurate water temperatures during both peak and zero-demand “idling” periods. With a Rada 425R installed as the primary temperature controller within a pumped recirculation system, there will be a zero minimum blended water flow rate/draw-off requirement. The Rada 425R features a unique integral thermostatic return limiter that maintains recirculating water temperatures within the circuit. Thermostatic return limiters eliminate the requirement for a fitted aquastat and reduce cycling wear and tear on the circulating pump.

Operational Specifications

• Dual thermostatic elements provide redundancy in the event of individual thermostat failure
• Typical system temperature control +/-5°F
• Adjustable maximum temperature limit stop
• Single temperature locking feature




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