IOM 1062
Direct Drive Fluid Coolers
11
With glycol solutions the pump performance curve will drift to the right from its design
point, due to differences in circuit design, control valve application, pressure drop
calculations, etc. The pump should be selected high on the curve so as to provide for the
"drift'. The pump curve should be "flat" so that the pump will compensate for the inability
to exactly predict the final operating system flow condition and to provide sufficient flow
for satisfactory heat transfer and maximum protection against freezing at the far end of the
circuit. The pump motor should have sufficient power for operating over the entire pump
curve to prevent motor overload at reduced voltages. Paralleled pumps can also be used for
good power economy and continuous and automatic standby operation. Properly applied
parallel pumps will guard against system breakdown caused by a simple pump failure.
Certain older systems have non-operating standby pumps of equal capacity to the operating
unit. We recommend parallel pumps in continuous operation because they provide
practically the same type of standby, in addition to being completely automatic, at lower
initial and operating cost.
Ambient Conditions
Fluid coolers can be operated in an ambient temperature that will not cause freeze-up based
on freeze point of the fluid being used. Care must be exercised to maintain the proper
antifreeze percentage.
Physical Data
The inlet and outlet connection size will be based on the number of feeds in the fluid cooler
circuit. Use the tables below to determine connection sizes.
Table 4, AFS 005 – 021, Connection Sizes
Feeds
Inlet / Outlet, in.
Feeds
Inlet / Outlet, in.
8
1 1/8
24
2 1/8
12
1 3/8
32
2 1/8
16
1 3/8
48
2 5/8
21
1 5/8
64
2 5/8
Table 5, AFS 023 – 107, Connection Sizes (Single-Row of Fans)
Feeds
Inlet / Outlet, in.
14
2 1/8
18
2 1/8
21
2 5/8
28
2 5/8
42
3 1/8
56
3 5/8
Table 6, AFD Connection Sizes (Double-Row of Fans, Dual Fluid Connections)
Feeds
Inlet / Outlet, in.
18
2 @ 2 1/8
28
2 @ 2 1/8
36
2 @ 2 1/8
42
2 @ 2 5/8
56
2 @ 2 5/8
84
2 @ 3 1/8
112
2 @ 3 5/8
Summary of Contents for IOM 1062
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