manual is a technical document provided by S&A Chiller (Teyu)
To Switch between Celsius and Fahrenheit: cwfl-6000 manual
The low-temperature circuit is intentionally set warmer than the high-temp circuit. As explained in the manual, this prevents condensation on the QBH. If the optics are too cold, moisture from humid air will condense on the fiber connector, causing back-reflection and destroying the laser source. manual is a technical document provided by S&A