Movincool CLASSIC40 サービスマニュアル
45
(3) Connect the charging hoses (red one
on high pressure side, and blue one on
low pressure side) of the gauge
manifold to the process tube fittings.
low pressure side) of the gauge
manifold to the process tube fittings.
NOTE: Connect the hoses using care not to
mistake the high pressure side for the low pres-
sure side and vice versa.
mistake the high pressure side for the low pres-
sure side and vice versa.
(4) Connect the charging hose (green) at
the center of the gauge manifold to the
vacuum pump.
vacuum pump.
Fig. 5-7
Connection of Gauge Manifold
Fig. 5-8
Purging
Fig. 5-9
Checking Airtightness
5-3-2.
Purging
(1) Open the high pressure valve (HI) and
the low pressure valve (LO) of the
gauge manifold.
gauge manifold.
(2) Turn on the vacuum pump to start
purging. (Purge the system for approx.
15 minutes.)
15 minutes.)
(3) When the negative pressure gauge
reading (degree of vacuumization)
reaches 750 mmHg or larger, close the
high pressure valve and the low
pressure valve of the gauge manifold
and turn off the vacuum pump.
reaches 750 mmHg or larger, close the
high pressure valve and the low
pressure valve of the gauge manifold
and turn off the vacuum pump.
5-3-3.
Checking Airtightness
(1) Leave the high pressure valve and the
low pressure valve of the gauge
manifold closed for five minutes or
more, and confirm that the gauge
pointer does not return to zero.
manifold closed for five minutes or
more, and confirm that the gauge
pointer does not return to zero.
(2) In case the gauge pointer returns
gradually to zero, there must be a leak
somewhere. In such a case, first
correct the brazed portion.
Purge the system once more, and
confirm there is no leak.
somewhere. In such a case, first
correct the brazed portion.
Purge the system once more, and
confirm there is no leak.