750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
6-9
6.10 — Operating Limit Temperature Control: Hot Water
FIGURE 6-5. Hot Water Controls
With the cover off, turn the adjustment wheel until the pointer indicates the desired range.
6.10 — Operating Limit Temperature Control: Hot Water
Set “cut-out” (burner off) temperature on the scale by inserting a screwdriver through the cover opening to engage
the slotted head adjusting screw. The “cut-in” (burner on) temperature is the cut-out temperature minus the differ-
ential. The differential is adjusted from 5º to 30º F.
6.11 — High Limit Temperature Control: Hot Water
Set the “cut-out” (burner off) temperature on scale using the adjusting screw. The control will break the circuit and
lock out on a rise in water temperature above the setting. The setting should be sufficiently above the operating
limit temperature to avoid unnecessary shutdowns. On a 30 psig hot water boiler, the setting is not to exceed 240º
F. The control requires manual resetting after tripping on a temperature increase. To reset, allow the water temper-
ature to drop below the cut-out setting less differential, and then press the manual reset button.
To prevent burner shutdown at other than low-fire setting, adjust the modulating pressure control to modulate to low-
fire BEFORE the operating limit pressure control shuts off the burner. Failure to follow these instructions could result
in damage to the equipment.
!
Caution
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