| 摘要 |
PURPOSE:To enable an air mixing door to be opened and closed irrespective of an autoamplifier by providing an servo operating switch for the negative pressure operated air mixing door in the maximum cooling and heating positions of a temperature lever to form a separate circuit. CONSTITUTION:A power servo 61 is operated through an autoamplifier 66 and a transducer 64 by sliding left and right a temperature lever 68 to set controllably an air mixing door 17 to a predetermined position. When the temperture lever 68 is set to the maximum cooling or heating position, vacuum microswitches 96, 97 are operated. Thus, microswitch ports M1, M2 communicate to each other so that negative pressure in a vacuum tank 63 is introduced into the power servo 61 without passing through the transducer 64 to drive the air mixing door 17 to position F or D. Thus, the air mixing door 17 can be operated irrespective of the autoamplifier and transducer. |
