In two-zone mode defrost sensors R1.1 and R1.2 and the fan control relays each act separately on one zone.
R1.1: Defrost sensor (Terminal Z31/Z32)
R1.2: Defrost sensor (Terminal Z81/Z82)
Expansion valve 1: Relay for expansion valve 1 (Terminal 23/24)
Expansion valve 2: Relay for expansion valve 2 (Terminal 33/34)
Fan 1: Fan control relay (Terminal 63/64)
Fan 2: Fan control relay (Terminal 73/74)
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