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RLC-SVX07A-EN
137
Maintenance
This section describes specific maintenance procedures which must be
performed as a part of the normal maintenance program for this unit. Be
certain that electrical power to the unit is disconnected before performing
these procedures.
WARNING
Prevent Injury!
Position all electrical disconnects in the "OPEN" position and lock
them, to prevent injury or death due to electrical shock.
Cleaning the Evaporator (RTWA and RTUA)
The evaporator water system is a part of a closed loop and should not
accumulate an appreciable amount of scale or sludge. If it is determined that
the chiller is fouled, first attempt to dislodge any foreign material by
backflushing the system several times. If this does not work satisfactorily,
chemically clean the chiller using the procedures outlined in Paragraph
"Mechanical Cleaning (RTWA)" on Page 137
.
Cleaning the Condenser
General (RTWA)
Water available for condensing frequently contains minerals or other contam-
inants that collect on the inside of the condenser tubes as carbonate scale.
Scale accumulation will accelerate with high condensing temperatures and
use of water with high mineral content. Cooling towers collect dust and
foreign material which also deposit on the condenser tubes, forming sludge.
To maintain maximum efficiency, the condenser must remain as free of these
deposits as possible. Even a very thin layer on the inside tube surfaces
reduces the heat transfer ability of the condenser. Indications of scale
deposits are decreased water flow through the condenser, reduced temper-
ature differential between entering and leaving condenser water and abnor-
mally high condensing temperatures.
There are two accepted methods of cleaning condenser tubes, as discussed
in the following paragraphs.
Mechanical Cleaning (RTWA)
The mechanical cleaning method is used primarily to remove sludge and
other loose material from the condenser tubes. Follow the steps below:
1.
Turn off the chiller and condenser water supply.
2.
Break piping connections at the unions.
3.
Remove the condenser waterboxes.
4.
Run a round nylon brush from end to end through the tubes, to loosen
deposits.
5.
Flush the tubes with water. Then inspect the tubes for scale accumula-
tion. If there is no scale in the tubes, reassemble the condenser and pip-
ing.
6.
If there is scale in the tubes, follow the procedures in Paragraph
"Chemi-
cal Cleaning (RTWA)" on Page 138
.
Summary of Contents for R Series
Page 17: ...RLC SVX07A EN 17 Installation Mechanical Figure 2 Rigging and Lifting for RTWA Units ...
Page 22: ...22 RLC SVX07A EN Installation Mechanical Figure 7 Rigging and Lifting for RTUA Units ...
Page 25: ...RLC SVX07A EN 25 Installation Mechanical Figure 10 Rigging and Lifting for RTCA Condenser ...
Page 69: ...RLC SVX07A EN 69 Installation Electrical Figure 28 Interconnecting Wiring from RTUA to RTCA ...
Page 129: ...RLC SVX07A EN 129 Start Up Procedures Figure 41 RTWA Unit Sequence of Operation ...
Page 130: ...130 RLC SVX07A EN Start Up Procedures Figure 42 RTUA Unit Sequence of Operation ...
Page 154: ...154 RLC SVX07A EN Diagnostics ...
Page 156: ...156 RLC SVX07A EN 3332 ...
Page 158: ...158 RLC SVX07A EN 3333 ...
Page 160: ...160 RLC SVX07A EN 3334 ...
Page 162: ...162 RLC SVX07A EN 3335 ...
Page 164: ...164 RLC SVX07A EN 3336 ...
Page 166: ...166 RLC SVX07A EN 5119 ...
Page 168: ...168 RLC SVX07A EN 5143 ...
Page 170: ...170 RLC SVX07A EN 5144 ...
Page 172: ...172 RLC SVX07A EN 5145 ...
Page 174: ...174 RLC SVX07A EN 5146 ...
Page 176: ...176 RLC SVX07A EN 6008 ...
Page 178: ...178 RLC SVX07A EN 6009 ...
Page 180: ...180 RLC SVX07A EN 5147 ...
Page 182: ...182 RLC SVX07A EN 6526 ...
Page 184: ...184 RLC SVX07A EN 5150 ...
Page 186: ...186 RLC SVX07A EN 6010 ...