Ma switch a HW18 amagwiritsidwa ntchito powongolera kuthamanga kwa thanki pakati pa ma values ​​awiri okonzedweratu pa ma compressor a mpweya oyendetsedwa ndi magetsi a magawo atatu. Amapezeka ndi valavu yotsitsa, yomwe imaletsa ma compressor kuti asagwe pansi pa katundu, ndipo imapezeka ndi chogwirira cha On-Off chodulira compressor ndi manja.

Ma switch a HW19 amagwiritsidwa ntchito powongolera kuthamanga kwa thanki pakati pa ma values ​​awiri okonzedweratu pa ma compressor a mpweya oyendetsedwa ndi magetsi. Amapezeka ndi valavu yotsitsa, yomwe imaletsa ma compressor kuyamba kunyamula katundu ndipo imapezeka ndi chogwirira cha On-Off chodulira compressor ndi manja.

Ma switch a HW20 pressure amagwiritsidwa ntchito powongolera kuthamanga kwa thanki pakati pa ma values ​​awiri okonzedweratu pama compressor ang'onoang'ono oyendetsedwa ndi magetsi. Okhala ndi valavu yotsitsa, amatha kuletsa ma compressor kuyamba kunyamula katundu. Choletsa chochotsa chokha cha compressor chodula ndi manja. Mitundu yonse iwiri ya ma ports awiri ndi anayi imapezeka yomwe imapereka kuyika kosavuta kwa ma valve ndi ma gauge.