In two-zone mode, Ry.1 sensors act on Relay 1 and Ry.2 on Relay 2.
R4.1: Cold room air sensor (Terminal Z21/22)
R5.1: Evaporator inlet sensor (Terminal Z41/42)
R6.1: Evaporator outlet sensor (Terminal Z51/52)
R4.2: Cold room air sensor (Terminal Z71/72)
R5.2: Evaporator inlet sensor (Terminal Z91/92)
R6.2: Evaporator outlet sensor (Terminal Z01/02)
Expansion valve 1: Relay for expansion valve 1 (Terminal 23/24)
Expansion valve 2: Relay for expansion valve 2 (Terminal 33/34)
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