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AQUASTAT SWITCHING ACTION WITHIN L8124C
CONTROL
The switching action within the L8124C control has
three settings:
1. high limit
2. low limit
3. adjustable differential
HIGH LIMIT OPERATION —-
The high limit opens and turns off the burner when the
water temperature reaches the set point. The high limit
automatically resets after the water temperature drops past
the set point and through the 10°F differential.
Set the indicator at desired shutoff temperature.
LOW LIMIT OPERATION —-
On a temperature rise, with the adjustable differential
at the minimum setting of 10°F, the burner circuit (R-B)
breaks and the circulator circuit (R-W) makes at the low
limit set point. On a temperature drop of 10°F below the set
point, the R-B circuit makes and the R-W circuit breaks.
ADJUSTABLE DIFFERENTIAL —-
At any differential setting greater than 10°F, the R-B
make temperature and R-W break temperature will remain
the same-control setting minus 10°F. The R-B break and R-
W make temperature will be the set point temperature plus
the difference between the differential setting and 10°F.
EXAMPLE: Set point of 140°F; differential set at 25°F.
On a temperature rise, R-B will break and R-W will make
at 155°F. On a temperature fall, R-B will make and R-W
will break at 130°F.
Set low limit indicator at the minimum temperature
recommended for domestic hot water supply. This setting
must be at least 20°F below high limit setting to prevent
one switch from locking out the other.
Set the differential the desired number of degrees.
25°F differential gives longest burner cycles.
AQUASTAT SWITCHING ACTION WITHIN L8148A
CONTROLS
The switching action in the L8148A control has one
setting, the high limit. The switching relay is controlled by
the low voltage room thermostat. On a call for heat, the
relay contacts make to complete the line voltage circulator
circuit and also the burner circuit if the boiler water
temperature is below the high limit setting. The high limit
switch shuts off the burner if boiler water temperature
exceeds the high limit setting.
Set the indicator at the desired shutoff temperature.
(Non-Burnham Drawing
Copy from other Manual)
SECTION V: BOILER CLEANING
WARNING
All boiler cleaning must be completed with burner service switch turned off. Boilers
equipped with burner swing door have a potential hazard which can cause severe property
damage, personal injury or loss of life if ignored. Before opening swing door, turn off
service switch to boiler to prevent accidental firing of burner outside the combustion
chamber. Be sure to tighten swing door fastener completely when service is completed.