This European Standard establishesThe requirements and teststhe pressure一here after called devices一to ensure thatTheapplied to safetydevices for limitingpressure generator in refrigerating systems and/or heatsystem andlor heat pump.These devices are of specialcontacts.maximum or minimum pressun:, which is caused by apumps, is maintained withinThe limits of the refrigeratingconstruction equipped with mechanically operated output