Techs and Techettes,
ICM makes an "economical" phase monitor, the above mentioned ICM 402. I put a boatload of these in a plant about 6 years ago. Been online since then. Recently, a couple of the refrigeration units have been kicking the oil failure mysteriously. All is well, net oil and contactors OK. No pressurized crankcases, etc. Wiring checked and the units watched coming out of defrost etc. Here is the question: I noticed that on the two units that are cutting of on oil fail, that the ICM 402 green light is considerably duller than other units that are onsite. Could there be a connection? Control and line voltage OK at both units and at the control. Thanks in advance.