JUMO ATH SW Series Operating Instructions Manual page 20

4 Installation
Connection Twin thermostat
diagrams
System I and II:
with changeover contact,
switching action: TW, STW
System I: with changeover contact,
switching action: TW, STW
System II: with break contact and
lockout,
switching action: STB
System I and II:
with break contact and lockout,
switching action: STB
20
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