Rinnai Advance Specifications download pdf (Page 13)

The Rinnai Ultra Series Tankless Water Heater RUR Models

SAVING TIME, WATER AND MONEY WITH SMART RECIRCULATION.

Recirculation in action… HOW THE RUR WORKS.

HOT WATER

COLD WATER

Crossover Valve

In applications where a dedicated recirculation line is not available or too costly to install, the RUR Tankless Water Heater will

also work using the crossover method of hot water recirculation. The RUR’s integrated recirculation pump, internal bypass line and

thermal bypass valve, which is included as standard with every RUR unit, make the crossover method of recirculation possible. The

valve is installed between the hot and cold supply lines on the furthest ﬁxture in the plumbing line from the tankless water heater.

The cold water line is then used temporarily as the return portion of the circulation loop.

In the Crossover Mode, the integrated pump circulates water from the tankless water heater through the hot water supply line,

through the thermal bypass valve, and back to the tankless water heater via the cold water line. When hot water is detected at the

valve, the water ﬂow through the thermal bypass valve reduces down to barely a trickle, continuing to sense water temperature in

the line. The pump will continue to operate and recirculate inside the water heater only until the end of the time interval and will

restart at the beginning of the next interval. Installation of the bypass ﬁlter that’s included in the box is used in the Crossover Mode

to allow the internal circulation of water through the water heater after the thermal bypass valve has closed.

In Crossover mode, the RUR again provides for additional control of the integrated pump through time-only based Comfort or

Economy Mode settings. In Comfort Mode, the typical pump on/off intervals will vary depending on the length of recirculation

loop used. For a short loop, the pump will be on for 8 minutes, off for 4; long loop, on for 16 minutes off for 4. In Economy

Mode, again the typical pump on/off intervals will vary depending on the length of recirculation loop used. For a short loop, the

pump will be on for 8 minutes, off for 10; long loop, on for 16 minutes, off for 10, providing additional energy and cost savings.

Regardless of the hot water recirculation method used, the end result is the same: During active circulation periods, hot water is

always available as it circulates from the hot water line back to the Rinnai RUR tankless heater.

CROSSOVER MODE

Installed Thermal Bypass Valve

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Rinnai Advance Specifications Page 13