Taylor-Wharton Auto Fill Laser Pak - Manual (Page 25)

25
Checking Vacuum
This product is carefully designed, manufactured, and tested with every effort made to eliminate vacuum
space leakage. An absorbent material (molecular sieve) and a reactive chemical (palladium oxide) are sealed
inside the vessel casing to help maintain the vacuum over a long period of time. However, some vacuum
deterioration may be experienced after years of service due to out-gassing of materials inside the vacuum
space. To determine if vacuum deterioration has occurred perform an evaporation rate test:
1.
Press the Start/Stop button on the control panel inward while leaving the power switch in the
“On” position.
2.
Close the liquid auxiliary valve on the bulk tank.
3.
Slowly open the vent valve (V3) of the vessel with the suspect vacuum using the manual
override. Use a face shield and insulated gloves to protect against possible contact with liquid.
Allow the vessel to vent down to atmospheric pressure. This may require an hour or more.
4.
Check the liquid level reading of the vessel on the display inside the control panel. If it is less
than 50 percent it will be necessary to add more liquid. Slowly open the liquid auxiliary valve on
the bulk tank. Fill the vessel to greater than 50 percent full and close the valve.
5.
Leave the vent valve (V3) open. After 24 hours, note the liquid level reading of the vessel. Take
a second reading after another 24-hour interval. Compare the two readings.
A liquid level decrease exceeding 15% over a 24-hour period may indicate a vacuum problem. Condensation
or even ice on the vessel jacket is another indication of a vacuum problem. Note that some icing or
condensation is normal around the piping connections of the vessel. Condensation may also occur on the
vessel’s outer surface as a result of high humidity.
If it has been determined that the vessel has a vacuum problem, it will be necessary to repair or replace the
vessel. A skilled service technician should perform vessel replacement or repair. Contact Taylor-Wharton
customer service at 1-800-898-2657 for assistance in locating the closest service center.