System Cleaning - BAC FXV-0806-12D Series Operation & Maintenance Manual

• Occasionally the surface of stainless steel can get iron chips or shavings embedded
in it from having galvanized steel machined or welded in the vicinity. The iron chips
can start to rust, reducing the corrosion resistance of the stainless steel, and stain
the surface giving the impression that the stainless steel is rusting. These types of
contaminants require more aggressive cleaning. Mild abrasives such as Scotch-Brite™
products may be used where aesthetic considerations are not important followed by
solvent cleaning with organic solvents as described above. It is important to rinse the
surface with warm water and wipe with a dry cloth after cleaning.
• If the iron chips are not removed with the Scotch-Brite™ Products, electro-chemical
cleaning may be required. BAC uses commercially available equipment for electro-
chemical cleaning in the field. Contact your local BAC Representative for more
information.

System Cleaning

System Cleaning for FXV and FXV3 Models
With proper precautions, prior to start-up circulate an alkaline solution which can be used
to clean condenser water systems through a closed circuit cooling tower. The necessary
precautions include:
• Limit the duration of the cleaning to one day or at the most two days.
• The temperature of the solution should never exceed 100ºF (37.8°C).
• The maximum concentration of chemicals in the circulation solution should not
exceed any of the following:
– 5% Sodium Hydroxide
– 5% Sodium Metasilicate
– 2% Sodium Carbonate
– 2% Tetra Sodium Pyrophosphate
– 0.5% Trisodium Phosphate
– 0.5% Sodium Nitrate
– 5-10% Butyl Cellosolve
Coil Cleaning for FXV and FXV3 Models
The outside of the heat exchange coil may require occasional cleaning. The chemicals
used must be compatible with the materials being treated. For example, the standard coil
is galvanized steel on the outside. The inside of the coil is black carbon steel. For finned
coils, the coil cleaning must be careful not to damage the fins (outside of the coils) and
the coils themselves. For specific recommendations on coil cleaning, contact a qualified
consultant.
Weld Byproduct Cleaning for CXVB and CXVT Models
The installation and manufacturing processes commonly used for field assembly of steel-
piped systems may leave weld byproducts inside coils and connecting piping (especially in
refrigeration systems). It is common practice to install filters and/or strainers that remove
contaminants during initial system operation. Shortly after system start-up, the filters and/
or strainers should be cleaned or replaced.
Corrosion Protection
Long Term Care of Stainless
Steel
BAC's Manufacturing Process
Recommended Cleaning
Procedure
System Cleaning
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