外表长得一样,但里面不一样 ( O- P! w3 C# a8 h 9 a" e/ l! v9 x. E1 u2 e2 H; A. I, k! z" Sone stage T-STAT has "w" wire terminal2 c9 a: C" B. z! w% P# G/ P& [
two stage T-STAT has "w1" and "w2" wire terminal8 R( c) }; h+ Y; D
$ X8 k8 P: \5 b+ C+ ^( l% A; q3 V$ |0 s" Z2 P
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