Page 38
VIII. MAINTENANCE OF ENVIRONMENTAL PROTECTION REFRIGERATOR
8.4.2
Operational Sequence
i.
Vacuum pump starts to operate (to
be stopped until finishing the vacuum
extraction till to Point 13).
ii.
Open VB valve first and then open
LB, HB valves.
iii. Vacuum extraction (5 minutes)
iv. After extracting vacuum for 5
minutes, close HB, VB valves and
leave LB valve open.
v.
Open CB valve and let 50g of freon
enter the freezing system from LB
side, the low pressure gauge be kept
at 3~4 kgf/cm
2
of pressure at this
time.
vi. Close both CB and LB valves
vii. Loosen the nut of connection point
A to discharge the air. Confirm the
balance of high, low pressures.
viii. Open HB valve to discharge the air
until the high pressure gauge
reaches 1.0 kgf/cm
2
G, then close HB
valve at this time.
Содержание TBG440ANDR
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