TROUBLESHOOTING
All troubleshooting should only be performed by a qualified carbon dioxide service
technician. Reference the appropriate Wiring Schematic Drawing and the appropri-
ate Process and Instrumentation Diagram Drawing in the Appendix of this manual
for component identification.
PROBLEM POSSIBLE CAUSE REMEDY
Compression cylinder pressure too high
(55 - 60 psig (3.79 - 4.13 bar))
1. Moisture or debris on the exhaust fil-
ter screen
2. Restriction in the vapor exhaust line
3. Metering valve open too much
4. Injection valve not closing properly
1. Replace or clean according to the
procedure on page 4.6
2. Locate and remove restriction
3. Close valve until pressure drops to
35 - 40 psig (2.4 - 2.8 bar) during liq-
uid CO
2
injection
4. Check vapor supply pressure, should
be minimum 90 psig (6.2 bar) - if
vapor supply pressure above 90 psig
(6.2 bar), repair or replace injection
valve actuator
Compression cylinder pressure too high
(exceeds 60 psig (4.13 bar))
1. Over pressure switch out of adjust-
ment or defective
2. Repair or replace and troubleshoot
causes 1-4 above
Compression cylinder pressure too low
(0 - 20 psig (0 - 1.37 bar))
1. Closed or restricted liquid supply line
2. Metering valve closed too much
3. Storage unit pressure too low
4. Injection valve not opening fully
5. Transition box leaking
6. Injection valve not seating properly,
allowing CO
2
to leak through when
closed causing plug
1. Check supply valve and/or strainer or
filter
2. Open valve during injection cycle until
pressure rises to 35 - 40 psig (2.4 -
2.8 bar)
3. Storage unit pressure should be
minimum 200 psig (13.8 bar), 250 -
300 psig (17.2 - 20.7 bar) is
preferable
4. Check the vapor supply pressure
(max 125 psig (8.6 bar))
5. Replace gasket(s), check and replace
filter screen according to procedure
on page 4.6 if necessary
6. Repair or replace
Dry ice pellets blow out during compres-
sion stroke
1. Dirt, moisture or debris on the
exhaust filter screen causing ex-
cessive pressure
2. Excess vapor trapping between pis-
ton face and plug on compression
stroke
3. Limit switch out of adjustment caus-
ing dry ice plugs that are too short
1. Replace or clean according to the
procedure on page 4.6
2. Adjust timer(s) T1 and/or T2 in con-
trol panel to higher setting to increase
the delay prior to the compression
stroke, allowing the excess vapor
time to exhaust
3. Adjust limit switch away from extru-
sion die slightly to produce longer dry
ice plugs
5.1
To Next Page
Loading...