Carrier TRANSICOLD PrimeLINE 69NT40-571-001, Руководство по эксплуатации и обслуживанию, Страница: 132 / 186

T-372 7–16
6. Allow the Oakite No. 32 solution to soak in the tube coils for several hours, periodically pump-circulating it
with an acid-proof pump.
An alternate method may be used whereby a pail (see
Figure 7.9 ) filled with the solution and attached
to the coils by a hose can serve the same purpose by filling and draining. The solution must contact the
scale at every point for thorough de-scaling. Air pockets in the solution should be avoided by regularly
opening the vent to release gas. Keep flames away from the vent gases.
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 Provi
-
dence, 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 con
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stantly moving through the sight glass, the unit may have a low refrigerant charge or the filter drier could be par
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tially 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 the indicator shows a high level of moisture, the filter drier should be
replaced.
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