VAC DRI-TRAIN HE-493, Техническое руководство, Страница: 50 / 61

VAC _____________________
Vacuum/Atmospheres
Table 5-1. VALVE {SOLENOID AND MANUAL) FAILURE INDICATION
VALVE
PURGE {J)
VENT {N)
. VACUUM {K)
{Solenoid)
FAILURE INDICATION
FAILURE TO ENERGIZE
I
Note
I
Both J and N solenoid valves work
together. If either fails, the
following would be evident:
- Regeneration failure.
- Moisture will not be purged out of the saturated
molecular sieve, and there will be no conversion of
the saturated Ql.
- If the valve 11
freezes
11
in the deenergized position,
excess pressure might build up in the purifier during
heating.
- Purifier may overheat and damage charge if there is
no flow during regeneration.
FAILURE TO DEENERGIZE
- Purifier will be backfilled with air when the VACUUM
cycle starts.
- Entire ORI-TRAIN system would be continuously vented
to the outside atmosphere. Pressure would never
build up.
- Regeneration failure.
FAILURE TO ENERGIZE
- Regeneration failure.
5-7
HE-493-7/80