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.
Fig. # 8643
TemperatureControl
HIGHLIMIT
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.
Fig. # 9314
Manual Reset High Limit
Fig. #9317
Flow Switch
28