GRAPH #3 Graph #3 illustrates the method of creating the Energy Conservation Demand Signal. The “COLDEST ROOM BRANCH SIGNAL” is attained via a multi-selector, which produces the lowest signal of the rooms that are sampled. The coldest room signal is obtained at sensing point (H) on FIGURE #2. The lowest signal is sent to a biasing relay which offsets the signal so that the pressure at which the heating function in the unitventilator is fully open will cause a branch signal from the relay to simulate the warmest outside air temperature considered in the building’s original reset schedule. The relay’s signal is limited to that value, as a maximum, which sets the minimum water temperature at which the system will be allowed to operate. The signal from the limiting relay goes to a high selector, which also receives a signal from the actual outside air temperature transmitter that prevents the supply water temperature from exceeding the original reset water schedule. The actual outside air temperature readings were obtained at sensing point (G) on FIGURE #2 and the Energy Conservation Demand Temperature Signal readings were obtained at sensing point (I) on FIGURE #2. 8.135
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