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TANKSTAT TEMPERATURE CONTROL
This is a bulb immersion type device that will
regulate the water temperature in the storage tank.
When the water temperature rises to the set point, the
switch opens and shuts off the main burners. As the
water cools down, the switch closes and turns on the
main burners again to maintain the desired water tem-
perature.
FLOW SWITCH
Dual purpose control shuts off heater in case of
pump failure or low water flow condition.
Factory mounted on all boilers except 136 and wired
in series with main gas valve.
NOTE: Flow switch will not operate if flow is less than
12 GPM.
Manual Reset High Limit
Fig. # 9314
HIGH LIMIT
The high limit is also a bulb immersion type device
that limits the water temperature in the heater outlet. It
will shut off the main burners when the heater outlet water
temperature exceeds the high limit setting, and cycles
on again when the water temperature drops to the set
point, less the differential.
Models are equipped with manual reset high limit on
all models except 136. Model 136 is equipped with an
automatic reset high limit.
HIGH LIMIT (Manual Reset)
The manual reset high limit is similar to the auto-
matic reset high limit, except the reset button on the front
of the case must be pushed in to allow the main burners
to operate again after a high limit shutdown.
Models are equipped with manual reset high limit.
The temperature setting is usually set 30° to 40°F above
the operating temperature.
Temperature Control
Fig. # 8643
Flow Switch
Fig. #9317
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