外表长得一样,但里面不一样7 l( B Y$ _0 b' V; y6 P
" y# L7 F$ b* C
one stage T-STAT has "w" wire terminal# l) F4 T2 l! X2 F! T8 Y6 Q7 w! v
two stage T-STAT has "w1" and "w2" wire terminal4 {6 _- W+ W( N; q# q
; _' Q( ?- h; T- s1 |& c) x0 |5 e; I1 z2 O' P" \. v
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