Operator`s manual

Appendix A: Troubleshooting VirTis BenchTop 2K, 4K and 6K

40 Revision 004, 12/09

If none of these suggestions eliminate the vacuum problem:

1. Change and flush the oil in vacuum pump.

2. Disassemble all vacuum tubing connections, clean with a mild alcohol (such

as methanol), apply a light coating of vacuum grease and reassemble.

3. Check all threaded and welded connections and seal with vacuum sealant.

If poor vacuum persists, or if testing vacuum with a calibrated gauge indicates a good

vacuum reading, the problem is likely related to the vacuum probe. Replace the

vacuum probe tube and retest.

Note: If this does not resolve your vacuum problem, contact SP Industries for assistance.

Product Melting

The most common reason for product melting is poor vacuum. Adequate vacuum is

required to keep products in a frozen state. Check for a vacuum leak or possible

restrictions in the vacuum hose as described in the previous section.

If the unit is functioning properly but the product is still melting, the product’s freezing

point (eutectic temperature) may be too low to remain in a frozen state. Retest using a

water sample to determine if a mechanical or product-related problem exists.