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CHAPTER 2 - HOT WATER PIPING - RESIDENTIAL5. BOILER BY-PASS - THREE-WAY MIXING VALVESNOTES:• Restricting boiler water flow will increase return water flow and vice .versa. Supply water flow will always be boiler water plus returnwater.• Mixing may be accomplished manually or with an actuating motor.• Three-way valve application in this drawing creates a boiler by-NOTE: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 and page 42 for further details.50
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