51
TRIAD Boiler Systems, Inc.
West Chicago, IL
www.triadboiler.com
installation section of this manual. The temperature gauge is located so that it shall at all times indicate
the temperature of the water in the boiler at or near the outlet. The temperature gauge’s range shall be
such that it is capable of reading the water temperature of your water boiler at all times.
7.2.7 Pressure or altitude gauges
Each hot water boiler shall have a pressure or altitude gauge connected to it or its flow connection in such
a manner that it cannot be shut off from the boiler except by a cock with a tee or lever handle, placed on
the pipe near the gauge. The handle of the cock shall be parallel to the pipe in which it is located when
the cock is open. The scale on the dial of the pressure or altitude gauge shall be graduated approximately
to not less than 1-1/2 nor more than 3-1/2 times the pressure at which the safety relief valve is set.
7.2.8 Stack thermometers
All boilers are supplied with a proper stack thermometer good for at least 200°F installed at a location
indicated in the installation section of this manual.
7.3 Temperature controls
Water boilers are protected from over-temperature by two temperature-operated controls. The high limit
and operator temperature controls are installed as aquastats in the boiler’s outlet water spool.
7.3.1 High limit
Water boilers have a high temperature limit control that cut off fuel supply to prevent water outlet
temperature from exceeding its maximum fixed set point. This control is constructed to prevent a
temperature setting above the maximum design temperature. Operation of the high limit will cause a
safety shutdown requiring manual reset. The manual reset button is on the controller itself to make the
user aware of what has happened.
7.3.2 Operator
Hot water boilers have a control that will cut off the fuel supply when the system water temperature
reaches a preset operating limit, which shall be less than the maximum water temperature.
7.3.3 Firing rate control
Hot water boiler have a control that will modulate the burner between the firing rate set point and its
differential. On hot water boilers, both the operator and firing rate control typically have a single user
setting of temperature and a fixed subtractive differential determined at the factory during the time of
manufacture.
7.4 Maintenance on temperature limiting controls
Maintenance on temperature limiting controls is generally limited to visual inspection of the device for
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