For unit EREBA 12H (7525334): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA 12HT (7525336): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA 15H (7525335): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA 15HT (7525337): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA HE 11H (7535733): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA HE 11HT (7535737): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA HE 15H (7535735): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit EREBA HE 15HT (7535738): 1 for Heat exchanger sensor + 1 for Suction temp. Sensor + 1 for Outdoor temp. Sensor For unit YUNA2 11.5 HK (7526652): 1 Heat exchanger sensor For unit YUNA2 12 HTK (7526653): *Heat exchanger sensor For unit YUNA2 15 HTK (7526654): 1 Heat exchanger sensor For unit YUNA2 9 HK (7526651): 1 Heat exchanger sensor