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CHAPTER 3 - PIPING DIAGRAMSPiping: BOILER RETURN TEMPERATURE PROTECTION USINGBURNHAM COMMERCIAL rtc RETURN TEMPERATURECONTROL FOR SYSTEMS THAT MAY GO BELOW 135°FRETURN WATER TEMPERATURE ... . • includes outdoor reset. . • monitors boiler return water temperature. . • operates boiler circulator and 3-way valve• maintains minimum 135°F return water temperature. . • provides LCD display of retun water temperatureNOTE:If the system return water temperature periodically or continuouslyoperates below 135° F, the use of a three-way valve and BurnhamRTC Return Temperature Control is recommended. See separate RTCmanual for further details.56
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