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if the system has electric defrost, the compressor should be switched off and the defrost cycle initiated without pumping down the system, taking care not to allow excessive pressure to build up on the low pressure gauges.
hvis anlægget har elektrisk afrimning, bør kompressoren slås fra og afrimningsperioden indledes uden nedpumpning af systemet, idet der drages omsorg for ikke at tillade, at der opstår overtryk på lavtrykmanometrene.
know the basic operation of the following components used in a refrigeration system and their role and importance for refrigerant leakage prevention and identification: (a) valves (ball valves, diaphragms, globe valves, relief valves), (b) temperature and pressure controls, (c) sight glasses and moisture indicators, (d) defrost controls, (e) system protectors, (f) measuring devices as manifold thermometer, (g) oil control systems, (h) receivers, (i) liquid and oil separators
kende den grundlæggende funktion af følgende komponenter, der anvendes i et kølesystem, og deres rolle og betydning for forebyggelse og identifikation af kølemiddellækage: a) ventiler (kugleventiler, membraner, sædeventiler, kontraventiler), b) temperatur- og trykkontrol, c) skueglas og fugtighedsindikatorer, d) afrimningskontrol, e) systembeskyttere, f) måleinstrumenter såsom termometer til manifold, g) oliekontrolsystemer, h) modtagere, i) væske- og olieseparatorer