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WATER SHUTOFF VALVE - WATER-COOLED HEAT EXCHANGER (Optional Equipment) (Figure 5-3,
page 68) - A magnetic solenoid-operated water shutoff valve rated at 150 psig (10.3 bar) water pressure
should be mounted in the water outlet line after the oil cooler. The valve should be wired into the
compressor control circuit so that the valve opens to allow water to flow any time the compressor is
running. When compressor stops under automatic control, or is shut off manually, the valve should close,
stopping water flow through the system. See Wiring Diagrams in Section 4.
OIL RESERVOIR - The oil reservoir-separator combines multiple functions into one vessel. The lower
half is the oil reservoir, providing oil storage capacity for the system and the top portion, a primary oil
separation means. The reservoir also provides limited air storage for control and gauge actuation.
Figure 5-12 – OIL SEPARATOR
COMPRESSOR (GD ELIMINATORä) OIL SEPARATOR located in a separate housing, consists of a
renewable cartridge-type separator element and provides the final removal of oil from the air stream
(Figure 5-12).
Oil impinging on the inside of the separator element drains directly back into the oil reservoir by gravity.
Oil collected outside the element is returned through tubing to the compressor cylinder.
Oil carryover through the service lines may be caused by a faulty oil separator, faulty minimum pressure
valve, over-filling of the oil reservoir, oil that foams, oil return line malfunction or water condensate in the
oil. If oil carryover occurs, inspect the separator only after it is determined that the oil level is not too high,
the oil is not foaming excessively, the oil return line from the separator housing to the compressor cylinder
is not clogged or pinched off, the check valve in the oil return line is functioning properly, and there is not
water or an oil/water emulsion in the oil.
13-21-603
Page 80
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