750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
1-9
1.5 — Hot Water Controls (All Fuels)
1.5 — Hot Water Controls (All Fuels)
1.5.1 — Water Pressure and Temperature Gauge
Indicates the internal water pressure and the boiler water temperature.
FIGURE 1-6. Water Pressure and Temperature Gauge & Limit Controls (configurations will vary)
1.5.2 — 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.
1.5.3 — 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 burner
at a preselected temperature above the operating control setting. The high limit temperature control normally is
equipped with a manual reset.
1.5.4 — Modulating Temperature Control
Senses changing boiler water temperature and transmits the information to the modulating motor to change the
burner firing rate when the manual-automatic switch is set on “automatic.”
1.5.5 — Low-Water Cutoff
Breaks the circuit to stop burner operation if the water level in the boiler drops below a safe operating point, acti-
vating a low-water light and optional alarm bell if burner is so equipped.
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