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8 OPERATING AND SAFETY CONTROLS
8.1 Operating Temperature Control
An adjustable digital operating control is located in the front control panel. See TempTrac Electronic Controller
Panel in this manual for more information.
8.2 High Water Temperature Limit Control
The boiler is equipped with adjustable limit and high limit controls to control the maximum discharge water
temperature. These controls are located inside the control cabinet and are accessed by removing the bottom cover.
The High Limit Control is of the manual reset type and may be reset by pressing the limit reset button accessible
through the control panel cover. The Lower Limit is of the auto reset type and can be dial adjusted to operate just
above the set point of the main Operating Temperature Control. Pressing the reset on the High Limit Control will not
cause the control to reset until the water temperature has dropped below the set point of the manual reset High
Limit Control.
WARNING: Turn off all electrical service to the appliance when accessing the limit or high limit controls
located inside the control cabinet. This cabinet contains High Voltage wiring and terminals. If the electrical
service is not turned off and these terminals are touched, a dangerous shock causing personal injury or
death could occur. Close and fasten the control cabinet cover before restoring electrical service to the
appliance.
8.3 Relief Valve
A pressure only relief valve(s) sized in accordance with the ASME Boiler and Pressure Vessel Code, Section IV, is
installed in the tank.
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.
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
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.
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.
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