“We discovered that refrigeration plant had been poorly maintained, with ad hoc additions and changes that had left the plant limping along at best, and requiring constant attention to keep running.
Once installed, this quickly revealed that the plant was being manually switched off and on daily by end-user staff, bypassing the automated control system.
Other issues identified included an inaccurate LP sensor, which had been by-passed by a previous contractor, and capacity control relying on LP switches at 1 and 2bar.
“The successive breakdowns were a symptom of poor maintenance, low quality replacement parts and ill-advised system modifications over many years.