REPAIR & ADJUSTMENTS
3. Valve #26 (excess flow)
Valve #26 is energized and shifted to the excess flow position 200 microseconds after
valve 20 is shifted to the retract travel position.
Dry Ice Extrusion Process (start-up)
Note: When the cycle start is activated the microprocessor will determine if “A” cylin-
der has been selected, "B" cylinder has been selected or "Both" cylinders have been se-
lected to operate.
1. If "A" or "A&B" have been selected for an operation mode the first function will be
a clean out stroke on "A" (then a clean out stroke on "B"' if A&B were selected).
2. If "B"' had been selected then a clean out stroke on cylinder "B" is the only function.
Note: Clean out stroke consists of injection of C0
2
w/valve #2 for a preset injection
time then check for ice plug by sensing pressure on PS-1
3. If PS-1 senses pressure on clean out stroke, then the sequence shifts to normal opera-
tion.
4. If PS-1 does not sense pressure due to the presence of an ice plug. The machine goes
into a series of five (5) cool down cycles.
A. #1 inject CO
2
, with valve #3 for 1 minute (extrude and return)
B. #2 inject C0
2
with valve #3 for 1 minute (extrude and return)
C. #3 inject C02 with valve #3 for 1 minute (extrude and return)
D. #4 inject C02 with valve #3 for 1 minute (extrude and return)
E. #5 inject C02 with valve #3 for 1 minute (extrude and return)
5. Inject C02 with valve #2 and check for plug (pressure switch PS-1)
A. If PS-1 senses pressure the sequence will shift to normal operation.
6.9
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