CSZ ZP 16, Installation, Operation & Maintenance Manual, Page: 72 / 88

MAINTENANCE WITH Q&A
Page 5-10
LN2 BOOST COOLING TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT)
Table 7. LN2 System Troubleshooting Procedures
GN2/LN2 can displace oxygen
and become a hazard in an
enclosed area.
GN2 SYSTEM TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT)
Table 8. GN2 System Troubleshooting Procedures
WARNING
!
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
No LN2 Flow Check LN2 Supply Is the LN2 Supply tank empty?
Check solenoid valves Are the solenoid valves opening?
Do the solenoid coils have power? They should have
120 VAC applied to the coil.
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
Unit doesn't
reach low
humidity
setpoint Solenoid core spring not seated
properly or is broken
Remove solenoid valve. Spring should be seated on
core and not broken. Replace if necessary.
Solenoid coil burned out Remove cover, place iron or steel material
(screwdriver or nail) on exposed end of solenoid
base to feel the magnetic effect indicating proper
operation. Each coil should be energized for
30 seconds. Depress switch lever by hand and
listen for clicking contact. Switch should click
when depressed and when released. Replace if
necessary.
Excessive
drop in outlet
pressure Solenoid coil burned out Remove cover, place iron or steel material
(screwdriver or nail) on exposed end of solenoid
base to feel the magnetic effect indicating proper
operation. Each coil should be energized for
30 seconds. Depress switch lever by hand and
listen for clicking contact. Switch should click
when depressed and when released. Replace if
necessary.
Solenoid valve
chatter Solenoid valve defective Replace solenoid valve core assembly and solenoid
base.