外表长得一样,但里面不一样 ( R3 `% u3 ^1 l- L' U. S0 ?; v. W, E/ R. M1 ]3 h7 b* \
one stage T-STAT has "w" wire terminal5 @/ m; a; |' C
two stage T-STAT has "w1" and "w2" wire terminal0 Q0 Y/ R5 J/ a0 S5 e4 R
' @% R! r: P3 X P7 H3 X; `, i' b I5 d/ X/ r4 Z, u
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