City water should be piped to an open sight drain.
If water from the machine chilled water circuit is used for oil cooling, it should enter the oil
cooler inlet from the entering water line of the machine cooler. See Figure 12. Water leaving the
oil cooler should connect to the leaving water line of the machine cooler to a point downstream
from the chilled water sensor, so that oil cooler leaving water temperature does not affect the
sensor readings. See Figure 12.
Locate the oil cooler leaving water connection at some distance from any chilled water
temperature indicator. On single-pass machines, water leaving the oil cooler should be
connected into the suction side of the chilled water pump so that adequate pressure drop is
assured for oil cooling.
The nominal conditions for oil cooler water flow are:
Flow rate . . . . . . . . . . . . . . . . . . . 30 gpm (114 L/s)
Leaving temperature (max) . . . . . 85 F to 100 F (29 to 39 C)
Pressure drop at oil cooler . . . . . . 10.5 ft (3.2 m)
Max differential pressure across
closed solenoid valve . . . . . . . . . 150 psid (1029 kPa)
The oil cooler water connections at the plug valve are 1-in. FPT.
Click here for Figure 12 — Water Piping, Oil Cooler to Chilled Water Circuit
(Typical)
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