Welch Vacuum 2511B-76, C-75, C-76, C-77Aspiration/Filtration - Manual (Page 10)

SECTION 5: TROUBLESHOOTING
5.10 VACUUM PROBLEMS
5.11 Leakage, contamination, and unusual outgassing are the general causes of problems associated with
poor vacuum. To operate at maximum effi ciency, a system must be thoroughly clean. If the system is
completely clean and free from leaks and unwarranted vacuum problems still exist, the pump should be
checked. A simple criterion for the condition of the pump is the determination of its maximum vacuum
capability. This can be accomplished by blocking of the intake and reading the vacuum level on the gauge
(See Section 2.80).
5.20 PRESSURE PROBLEMS
5.21 Leakage and contamination are the general causes of problems associated with poor pressure. To
operate at maximum effi ciency a system must be thoroughly clean. If the system is completely clean and
free from leaks and unwarranted pressure problems still exist, the pump/compressor should be checked
by a service technician.
5.40 TROUBLE SHOOTING GUIDE FOR 2511
10
Symptoms Possible Cause Remedies
Reduced/low
Vacuum/fl ow 1. Clogged hydrophobic fi lter.
2. Regulator improperly set.
3. Air leak.
4. Jar lid gasket not secured to jar.
5. Collection vessel is full.
1. Replace the fi lter following directions in this
manual. (Section 4.12)
2. Set vacuum level following operating
instructions.
3. Check the tubing and connectors for possible
leaks. Attach, tighten or replace.
4. Be sure the jar lid and gasket fi t tightly on the
jar.
5. Empty vessel and reinstall.
Device does not
start 1. Power cord not plugged in.
2. Defective switch.
3. Vacuum still exists in system.
1. Plug in the power cord.
2. Contact your service center or distributor. (See
back page)
3. Disconnect tubing from the collection jar to
release vacuum. Reconnect tubing and turn on
the device.
Gauge reads
incorrectly 1. Faulty gauge. 1. Contact your service representative.
Device runs but
gauge reads “0” 1. Gauge tubing not connected or is
leaking. 1. Check the tubing and connectors for possible
leaks. Attach, tighten or replace.
Device stops
running during
use 1. Device overheated.
2. Blown fuse or circuit breaker in
household circuit.
3. Low voltage to device.
1. Unplug device and allow to cool for 10 minutes.
Plug in and restart.
2. Replace fuse or reset circuit breaker.
3. Too many motor operated appliances on same
circuit.