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CR60-IM.v0429.4
Relief Valve Piping
• Each Noritz tankless water heater on the CR60 comes installed with an isolation valve and a pressure
relief valve on the hot water outlet side.
• The pressure relief valve shall be operated once a year to ensure that it is functioning properly and
there is no obstruction. Turn the power off to the unit before opening the relief valve, and make sure
that water draining out of the valve will not cause any damage.
• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water system.
Contact the water supplier or a local plumbing inspector on how to correct this situation. Do not plug
the relief valve.
• The relief valve must be installed such that the discharge will be conducted to a suitable place for
disposal when relief occurs.
• Refer to the Water Heater installation manual for more information and proper piping for the relief
valve drain.
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