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US. Patent Jul. 7, 1998 Sheet 1 of 2 HVAC F|G_ 1 002 14/ SENSOR I 'NPUT ' \ 16 SENSOR/ I CONTROL DEVICE 5,775,406 ‘ 18 Tqh-AER ' UNIT 12\ DISPLAY 10 DEVICE FIG. 2 46.1 12 22 2s HVAC 602 66/ SENSOR ‘ FIG 3 Y = SENSOR \68 M74 ND CONVERTERS \70 ' 44—\ DISPLAY DEVICE A ROM -J \ 52 ¥ (~50 I k I 58 EEPROM‘J ‘D 12“ KEYPAD MEMORY 6Q 72 I V l PORT “ INTERFACE 54 II I 3 56f I BUZZER /8°
