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Water Pressure Relief Valve
(ss) – This device protects the water treatment filtration system against
75 psig overpressure in the line common with the compressor inlet.
Air Pressure Regulator
(All Seal Purge) (
n) - This device regulates the pressure of the air buffer
signal fed to all seals. It should be set to 5 to 7 psig.
Pressure Gauge
(o) – This 0 to 15 psig device displays the output signal from the pressure regulator.
Shuttle Valve
(l) - Also known as a double check valve, the shuttle valve is a device which will take two
(2) supply signals and allow the one with the highest pressure to pass through.
System Pressure Transducer
(s) - This device measures the delivery air pressure supplied to the
customer. The AUTO SENTRY W controller uses this measurement for loading/unloading logic. It is
located in the starter enclosure.
Reservoir Pressure Transducer
(t) - This device measures the discharge pressure from the water
cooler. The AUTO SENTRY W controller uses this measurement to prevent loaded starts and to monitor
coolant pressure. It is located in the starter enclosure.
Injection Pressure Transducer
(u) - This device measures the recirculation water filter discharge
pressure, prior to injection into the compressor. The AUTO SENTRY W controller uses this
measurement, in conjunction with that from the reservoir pressure transducer, to monitor the pressure
losses across the recirculation water filter. The AUTO SENTRY W controller displays a service warning
at 30 psig differential and shuts the package down at 40 psig differential. It is located in the starter
enclosure.
Air Filter Vacuum Switch
(ww) - This device senses the air pressure at the discharge side of the air
filter. The AUTO SENTRY W controller displays a service warning when a 25” H
2
0 pressure level triggers
the switch. It is located in the starter enclosure.
Discharge Thermistor
(v) - This device measures the compressor discharge temperature. The AUTO
SENTRY W controller uses this measurement for display and shutdown logic purposes. It is located at
the compressor discharge port.
Water Level Switches
(p) - This assembly (three level switches) senses water level in the reservoir.
The AUTO SENTRY W controller uses the individual signals to drain or fill the reservoir with water and to
shut the system down if an exceedingly high water level prevails.
Water Solenoid Valves
(aa, rr, tt) - The fill (tt) and drain (aa) valves respond to the signal from the
water level switches to fill or drain, respectively, water from the main reservoir. The dump (rr) valve
responds to signals from the PLC to dump the water charge stored in the water treatment reservoir when
the compressor unit is not operating.
PLC (RO timer function)
– This device governs the frequency and duration of the water-fill cycles. It
shares use of the fill water solenoid valve with the AUTO SENTRY W controller and governs the dump
water solenoid valve. It is located in the starter enclosure. Refer to the RO Filtration System, SECTION
8, for details on its operation and adjustments.
Oil Pressure Switch
(ah) - This device monitors the discharge pressure of the lubricating oil pump. It
protects the compressor against insufficient lubricating oil pressure – if within 10 seconds from starting,
the oil pressure does not reach 5 psig, the AUTO SENTRY W controller shuts the package down.
Oil Pressure Gauge
(ae) - This 0 to 100 psig pressure gauge is locally mounted on the oil filter
discharge line, and is provided to indicate system oil pressure and allow the adjustment of the oil pump
bypass valve.
Bypass Valve/Oil Pump Assy
(ac) - This device regulates the discharge pressure of the oil pump by
bypassing oil between the inlet and outlet ports. It should be adjusted to produce between 20 to 25 psig
of (warm) oil pressure.
Summary of Contents for PUREAIR EWD99E
Page 7: ...13 11 608 Page 2 Figure 1 2 PACKAGE ILLUSTRATION AIR COOLED 302EWD797 A Ref Drawing...
Page 8: ...13 11 608 Page 3 Figure 1 3 PACKAGE ILLUSTRATION WATER COOLED 303EWD797 A Ref Drawing...
Page 9: ...13 11 608 Page 4 Figure 1 4 WATER COOLED SCHEMATIC 300EWD797 D Ref Drawing...
Page 10: ...13 11 608 Page 5 Figure 1 5 AIR COOLED SCHEMATIC 301EWD797 D Ref Drawing...
Page 30: ...13 11 608 Page 25 Figure 4 2 FLOW CHART FOR SETUP PROGRAMMING 300EWC1255 Ref Drawing...
Page 44: ...13 11 608 Page 39 301EWD546 B Ref Drawing Page 2 of 2...
Page 46: ...13 11 608 Page 41 302EWD546 B Ref Drawing Page 2 of 2...
Page 48: ...13 11 608 Page 43 303EWD546 B Ref Drawing Page 2 of 2...