B-701964-00 Rev. C
Troubleshooting
4-1
Section
4
TROUBLESHOOTING
Troubleshooting procedures are listed in Table 4-1. This guide is not all-inclusive, but is
intended to serve as a general outline for solving operational problems. The table
describes symptoms, identifies probable causes, and suggests corrective actions.
When more than one probable cause is identified, the causes are listed in order of most
likely to least likely reasons for failure.
Table 4-1: Troubleshooting
SYMPTOM
PROBABLE CAUSE
ACTION
Low flow at all
flow control
valve settings
Low system pressure:
Check unit pressure:
•
gas leak
•
Locate leak; repair as needed.
•
unsaturated liquid
•
Allow liquid to saturate at 22 psig
(152 kPa). May require as long as
30 minutes at no flow.
•
primary relief valve
•
Conduct primary relief valve test
and replace if necessary.
Flow control valve inlet filter
screen dirty
Remove and replace flow control
valve inlet filter.
Obstruction or leak in liquid
withdrawal circuit
Check liquid withdrawal heat
exchanger tubing for blockage.
No flow
System is empty
Fill unit with liquid oxygen saturated
at 22 psig (152 kPa)
Zero pressure caused by major
gas leak (vent valve open,
relief valve malfunction, etc.)
Locate leak; repair as needed.
Flow control valve turned off
Set flow control valve at prescribed
rate.
Flow control valve inlet filter
screen obstructed
Clean or replace flow control valve
filter screen.
Obstruction in liquid
withdrawal circuit
Check liquid withdrawal heat
exchanger tubing for blockage.
High product
loss rate
Liquid oxygen leak in
plumbing
Locate leak; repair as needed.
Complete or partial loss of
vacuum
.
..
if NER test fails.
Summary of Contents for COMPANION 1000
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