Buchi Rotavapo R-250 Manuel d'utilisateur télécharger pdf (Page 30)

Rotavapor R-250

6 Maintenance

6.4 Changing the Seals on the Distribution

Head

s /PENTHE$.%ASY#LAMPBYRELEASINGTHEKNURLEDNUTS

on all 3 bolts, but do not screw the nuts completely off.

s 4ILTTHETOPBOLTOUTTOWARDTHEBACK

s /PEN THE UPPER AND LOWER %ASY#LAMP SEGMENTS AND

carefully lift the distribution head off the glass assembly.

s 4AKEOUTTHESEAL햲 laid in at the front and replace it.

6.5 Installing and Removing the Vacuum Seal

During the running-in phase, which lasts approx. 10 hours,

the seal may show signs of increased wear. This is normal

for a PTFE seal.

s 2EMOVETHE$.%ASY#LAMPCOMPLETELYANDTAKEOFF

the distribution head.

s 0ULLTHECYLINDRICALSEALHOLDEROUTANDTURNITOVER

s )NSERT4OOL.OINTOTHEMETALGUIDEONTHESEAL

and pull the seal out.

s 0UTINTHENEWSEALWITHTHEDARKSCRAPERRINGFACINGTHE

inside and the metal guide ring facing outward.

s )NSERTTHECYLINDERWITHTHESEALATTHEBACKLYINGONTHE

in-side.

s )NSERTTHESEALATTHEFRONT

s 0ROVISIONALLYINSTALLTHE%ASY#LAMPUSINGBOLTS

s 3ETTHEDISTRIBUTIONHEADOFTHEGLASSASSEMBLYONTOPOF

the seal.

s #LOSETHESEGMENTSOFTHE%ASY#LAMP&LIPTHETOPBOLT

up and in, and hand-tighten all 3 knurled nuts.

The unit should be tested for leaks each time the vacuum

seal has been removed.

Fig. 6.6: Taking out the Vacuum Seal

Fig. 6.5: Replacing the seal in the distribution head

햲

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Buchi Rotavapo R-250 Manuel d'utilisateur Page 30