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34-55 08/14
CAUTION
: Do not install a reducing coupling, valve or other restriction in the relief valve(s) discharge line. The
discharge line shall allow complete drainage of the valve and line. Relief valves should be manually operated at
least once a year.
WARNING: To prevent burns caused by hot water discharge and water damage, pipe the discharge from the
relief valve to a suitable floor drain for disposal when relief occurs. Avoid contact with hot discharge water.
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Thermal Expansion
A relief valve that discharges periodically may be due to thermal expansion in a closed system by components,
such as a backflow preventer or check valve in the cold water supply or a closed boiler heating loop. These
systems must be provided with means to control expansion. Contact a boiler or plumbing professional to
resolve this situation. Do not plug the relief valve.
8.4 Electronic Low Water Cut-Off
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Low Water Cut-Off Operation
When the water level is above the electrode position in the tank, the reset pushbutton will energize the control
(LED will be lit). The control remains energized until the water level recedes below the electrode position (LED
will not be lit). Unless otherwise specified, there is a three-second time delay on decreasing level. Water level
must be below tank probe location for full three seconds before control de-energizes.
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Manual Reset Operation for CSD-1 Code Compliance
If the manual reset low water cut-off control is in a low-water condition (water off probe) and there is an
interruption of power, the control will remain in the low-water condition when power is restored. To reset the
low water cut-off, press he reset button when the water level is restored to a point above the probe.
