對製冷系統進行故障排除時的基本信息
Signal to the alarm thermostat Here you have to define the ratio between the sensors which the alarm thermostat has to use. S3, S4 or a combination of the two. With setting 0% only S3 is used. With 100% only S4 is used. (The setting also applies to a possible B section - S3B, S4)