NOTE:
1.Building temperature controls supply electric power to building circulator.
2.Main flow switch proves main water flow before energizing sequencing and resetting controls.
3.Outdoor thermostat required if building controls do not provide automatic shutdown of reset controls during warm weather.
Boilers and Secondary
Circulator are Controlled by
Dual Bulb, Dual Switch Controller
Staging and Outdoor Reset of
Main Water Temperature
CONTROL APPLICATION DIAGRAM - FOUR BOILER
FIGURE 20.
27
