JUMO ATHf-SW Operating Instructions Manual page 20

4 Installation
Connection
diagrams
20
Twin thermostat
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