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T-362
7–20
7. The time required for de-scaling will vary, depending upon the extent of the deposits. One way to determine
when de-scaling has been completed is to titrate the solution periodically, using titrating equipment provided
free by the Oakite technical service representative. As scale is being dissolved, titrate readings will indicate
that the Oakite No. 32 solution is losing strength. When the reading remains constant for a reasonable time,
this is an indication that scale has been dissolved.
Figure 7.9 Water-Cooled Condenser Cleaning - Gravity Circulation
8. When de-scaling is complete, drain the solution and flush thoroughly with water.
NOTE
If condenser cooling water is not being used as drinking water or is not re-circulated in a closed or
tower system, neutralizing is not necessary.
9. Following the water flush, circulate a 56.7 gram (2 ounce) per 3.785 liter (1 U.S. gallon) solution of Oakite
Aluminum Cleaner® 164 through the tubes to neutralize. Drain this solution.
10. Flush the tubes thoroughly with fresh water.
11. Put the unit back in service and operate under normal load. Check the head pressure. If normal, a thorough
de-scaling has been achieved.
What You Can Do For Further Help:
Contact the Engineering and Service Department of OAKITE PRODUCTS CO., 675 Central Avenue, New
Providence, NJ 07974 U.S.A. (or visit www.oakite.com)
7.14 Filter Drier
On units equipped with a water-cooled condenser, if the sight glass appears to be flashing or bubbles are
constantly moving through the sight glass, the unit may have a low refrigerant charge or the filter drier could be
partially plugged.
7.14.1
Checking the Filter Drier:
1. Test for a restricted or plugged filter drier by feeling the liquid line inlet and outlet connections. If the outlet
side feels cooler than the inlet side, then the filter drier should be changed.
2. Check the moisture-liquid indicator. If it shows a high level of moisture, the filter drier should be replaced.
7.14.2
Replacing the Filter Drier:
1. Pump down the unit (see
). If the unit is not equipped with service values, evacuate the unit.
Then replace filter drier.
3’ to 4’
Fill condenser with cleaning solution. Do not add
solution more rapidly than vent can exhaust gases
caused by chemical reaction.
1” pipe
Approximately 5’
Condenser
Vent pipe
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