SUGGESTED MIXING BOX BAS/PNEUMATIC CONSERVATION LOGIC MAIN AIR HOT DUCT TYPICAL MIXING BOX THERMOSTAT M B (TYPICAL SAMPLE) PNEUMATIC ACTUATOR AIR SUPPLY TO SPACE ALL SAMPLE THERMOSTATS MUST HAVE LOCKABLE GUARDS COLD DUCT M 1 2 3 LOW 4 5 HIGH 6 SIX SAMPLE THERMOSTAT SIGNALS M-H/L SELECTOR P/I TRANSDUCER INPUT M B BR1 RATIO 1:3.33 INPUT P/I TRANSDUCER INPUT The intent of this circuit is to inform the BAS at all times via the P/I transducers of the immediate requirement for the degree of cooling needed for the warmest sample thermostat and the immediate requirement for the degree of heating needed for the coolest sample thermostat, coordinated with the mixing boxes throttling range, to keep all spaces in the comfort zone to the best of the fan system’s capability. This will improve comfort conditions and reduce energy use. The BAS will limit variable cooling in the cold duct to a minimum temperature of 13˚C, matching the design temperature. The BAS will assure proper minimum fresh air ventilation at all occupied times. The BAS will limit the variable hot duct temperature at all times to a maximum of the current BAS hot duct schedule. This logic will keep the hot duct and cold duct as close as possible to the same temperature at all times. The settings of the biasing relays (BR1) and (BR2) are determined when the mixing boxes’ throttling range is determined. INPUT M B BR2 RATIO 1:3.33 0 VOLT TO 10 VOLT TO COORDINATE COOLING WITH WARMEST ROOM MIXING BOX THE BAS USES ONLY PART OF THE 0 VOLT TO 10 VOLT SIGNAL AS RESET INPUT. 0 VOLT TO 10 VOLT TO COORDINATE HEATING WITH COOLEST ROOM MIXING BOX. 5.43D
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