Basics
1-6
750-368
CBEX Elite 100-1200 HP
1.5 — Hot Water Controls (all fuels) 100-800 HP only
1.5.1 — Pressure and Temperature Gauges
1. Water Pressure Gauge: Indicates the boiler internal water pressure.
2. Water Temperature Gauge: Indicates the boiler water temperature.
1.5.2 — Controls
1. Modulating Temperature Control: Senses changing boiler water temperature and transmits the information to
change the burner firing rate when the manual-automatic switch is set on “automatic.”
2. High Limit Temperature Control: Breaks a circuit to stop burner operation on a rise of temperature at a
selected setting. It is adjusted to stop the burner at a preselected temperature above the operating control set-
ting. The high limit temperature control normally is equipped with a manual reset.
3. Operating Limit Temperature Control: Breaks a circuit to stop burner operation on a rise of boiler temperature
at a selected setting. It is adjusted to stop or start the burner at a preselected operating temperature.
FIGURE 1-5. Temperature Gauge and Hot Water Controls
1.5.3 — Low Water Cutoff and ALWCO
1. Low Water Cutoff: Breaks the circuit to stop burner operation if the water level in the boiler drops below a
safe operating point, activating the low-water light and the optional alarm bell.
2. Auxiliary Low Water Cutoff (optional): Breaks the circuit to stop burner operation if the water level in the
boiler drops below the master low-water cutoff point.
Only properly certified personnel such as the safety valve manufacturer’s certified representative can adjust or repair
the boiler safety valves. Failure to follow these instructions could result in serious injury or death.
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