Als218c air cooled screw chiller, I was wondering if anyone can tell me, the thermistor for the compressor on this chiller is hooked up to terminals 1+2 for the compressor thermistor. What do the other 2 terminals do (there are 4 total). Benshaw starter board. Are there several thermistors in the compressor? Can I use these connections if my terminal 1-2 thermistor is suspected to be faulty (intermittent)? Thanks.