WCB11070 (PDF FORMAT)
9
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Copyright Eaton Corp. 2007, All Rights reserved.
Figure 5
2.4.6
Avoid the use of sharp bends and elbows that will
restrict water flow. Loops and bends in the lines may
create air pockets, which substantially reduce the flow
of coolant and can contribute to overheating.
2.4.7
Coolant and coolant supply lines should be free of for-
eign material (a 500 micron water filter is recom-
mended). In the event that contaminated water is
used as a coolant (not generally recommended), use
of a multi-stage filter/strainer may be desirable to
avoid the need for frequent cleaning of fine mesh fil-
ters.
2.4.8
Figure 5
illustrates a typical closed loop liquid to liquid
coolant system. The heat exchanger and temperature
control would be replaced with a radiator, fan and
motor in a liquid to air system.
2.4.9
The coolant supply temperature at the inlet should be
100
o
F (38
o
C) or lower. The coolant outlet temperature
should not exceed the values given in Table 8. How-
ever, in no event should there be more than a 50
o
F
(28
o
C) temperature rise between inlet and outlet. See
Table 8 for maximum allowable outlet coolant temper-
ature with various water/ethylene glycol mixtures and
other cooling media.
2.4.10
Open Loop Systems
For efficient operation of the WCB2, an adequate sup-
ply of filtered fresh water is required. (See 2.4.1 -
2.4.2). Excessive water hardness promotes the forma-
tion of scale deposits, which, in time, will affect the
service life of the WCB2 unit. Water of high acidity or
high in corrosive salts may cause electrolytic corro-
sion between the dissimilar metals used in the water
cavities. Water treatment should be considered if the
properties of the water exceed the following:
Equivalent calcium carbonate content hardness: Maxi-
mum 100 p.p.m.
pH value: 7.0 to 9.0.
Open loop systems should be thoroughly
flushed with clean fresh water after operation
to reduce the corrosive effects of contami-
nants on internal components.
2.4.11
Closed Loop Systems
For efficient operation of the WCB2 in a closed loop
system, ethylene glycol coolant conforming to SAE
Standard J1034 should be used. For preparation of
the proper concentration of a water/ethylene glycol
mixture, use make-up water which is low in corrosive
ions such as chlorides and sulfates.
Recommended pH value of the water/ethylene glycol
mixture: 7.5. to 10.5