M B P L M H 1 2 3 4 5 6 B M 1 2 3 IN IN 1 2 3 4 5 6 7 8 1 M 2 3 4 5 6 7 8 D/N 40°F 140°F 240°F 90°F 190°F -40°F 60°F 160°F 110°F 10°F 8.145 FIGURE TWO ROOM THERMOSTAT TO UNITVENTILATOR ROOM THERMOSTAT TO UNITVENTILATOR ROOM THERMOSTAT TO UNITVENTILATOR ROOM THERMOSTAT TO UNITVENTILATOR ROOM THERMOSTAT TO UNITVENTILATOR V1 TT2 TT1 PUMP HEAT EXCHANGER STEAM HWS HWR (F) HWS (G) OSA TEMP. TEMP. LIMITING RELAY M (H) B BIASING RELAY HIGH SELECTOR MULTI-HIGH/LOW SELECTOR RECEIVER CONTROLLER DA PROPORTIONAL (I) RESET SCHEDULE OSA TEMP. HWS TEMP. -10˚F 170˚F 60˚F 80˚F OUT ---- RESTRICTOR RESTRICTOR LOGGER SENSING POINTS (F) Supply water temperature (G) Actual OSA temperature (H) Coolest room branch signal (I) Energy demand signal PSIG
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