Water Temperature Control—Recirculation Systems—Thermostatic

Rada 50R-50R

Thermostatic Central Recirculation System Controller is designed specifically to be installed as the primary control assembly within a pumped recirculating hot water system.
Capable of maintaining safe, accurate water temperatures during both peak and zero-demand "idling" periods, the Rada 50R-50R features two Rada 50R thermostatic mixing
valves (page 38) piped in parallel. By combining the high flow capacity of two valves, Rada 50R-50R has a flow capacity of 193 gpm (731 lpm) at a 20 psi (1.4 bar) pressure drop.

Rada 50R-50R features two unique integral thermostatic return limiters that monitor recirculation return water temperatures to prevent "temperature creep" within the circuit. Thermostatic return limiters eliminate the requirement for a fitted aquastat and reduce cycling wear and tear on the circulating pump.

Rada 50R-50R features a specially designed surplus valve that effectively "stages out" one Rada 50R during periods when the system demand can be managed by a single valve. With a Rada 50R-50R installed as the primary temperature controller within a pumped recirculation system, there will be a zero minimum blended water flow rate/draw-off requirement.

Operational Specifications

• Dual thermostatic elements provide redundancy in the event of individual thermostat failure (50R)
• Typical system temperature control +/-5°F
• Adjustable single temperature lockout (50R removable key)