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VACUUM UNIT

VACUUM UNIT. By Drs. J A Y A MOH. ARIS AS’ARI , S.Pd. REFRIGERATION AND AIR CONDITIONING TECHNICAL SKILL PROGRAM SMKN 1 CIREBON Visit us on : ptu.smkn1-c i r e b on .sch.id. Vacuum.

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VACUUM UNIT

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  1. VACUUM UNIT By Drs. J A Y A MOH. ARIS AS’ARI, S.Pd • REFRIGERATION AND AIR CONDITIONING TECHNICAL SKILL PROGRAM • SMKN 1 CIREBON • Visit us on : ptu.smkn1-cirebon.sch.id

  2. Vacuum • Memvakum unit digunakanuntukmengevakuasiataumengeluarkanudaradanuap air yang terjebak di dalamsistempemipaannya. • Memvakum unit membuattekanansistemmenjadibertekanannegatif ( vacuum , standard tekanan vacuum 20 s.d 30 inHg). • Untukmembuatvacuum, digunakanalatkhusus yang disebutpompavacuum atauvacuum pump. • Pompavakuminiakanmenghisap gas yang adadidalamsistemsampaimencapaitingkatkevakumantinggi. • Kemudiansistemnyadibiarkandalamkeadaantersebutselamalebihkurang 12 jam. • Adanyakebocorandalamsalahsatulokasiakanmenyebabkantingkatkevakumannyaturun. • Bilamenjumpaikeadaansepertiitumakasistemnyaharusdiperiksadenganmetoda pressure test lagiuntukmemastikanlokasibocornya.

  3. TekananSistemdan Vacuum

  4. Kenapaharusadapemvakuman? • Dampakadanyaudaradanuap air di dalamsistem: • (i) Uap air dapatmengakibatkanterjadinyapemblokiran di saluranpipakapileratau dryer bilamembekumenjadies. • (ii) Udara yang terjebak di saluranbertekanantinggi di kondenserdapatmenyebabkankenaikantekanankondensing yang membahayakankompresor. • (iii) Uap air dapatbereaksidengan refrigerant bilamendapatpemanasan. Hasilnyaadalahsenyawaasamhidrofluorikdanhidroklorikyang mengakibatkankontaminasipadasistemnya. • (iv) Uap air dapatbereaksidengan lubricant sehinggamegubahkarakteristiklubricant karenaoksidasidan acidic. • (v) Uap air menyebabkanterjadinyaoksidasi. • (vi) Uap air dapatmemperteballapisanpipabagiandalam, sehinggamenyebabkanefekpenyempitanpipa.

  5. Vacuum Pump View

  6. Vacuum procedure

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