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Heat Exchanger Fan/Motor and Starter
- The combination axial fan/motor provides cooling air for the
heat exchangers and electronics box. The starter provides control for the fan motor only, as the latter
includes its own thermally-resettable, internal overload protection. This device is designed to operate
with 3 ph-60 Hz-460 vac electrical power – the necessary electrical wiring has been provided.
Control Transformer
- This device reduces the incoming power voltage to 110-120 volts for use by
various control components (e.g., 24 vdc power supply, electrical enclosure cooling fans, etc.). Two
primary fuses and one secondary fuse are provided for overload protection. This device is used with
electrical services other than 460 vac.
Power Supply (24vdc)
- This device supplies electrical power to the AirSmart controller and various
solenoid valves.
For Letter References A thru R below, see Figure 4-2, page 30.
Inlet (Poppet) Valve (B)
– This device is located at the intake flange of the compressor. When the
compressor is running, a 3-way solenoid valve, energized by the AirSmart controller, vents the poppet
internals to atmosphere, allowing it to open (normal state). When the compressor is stopped, a sump
pressure signal is fed to the poppet internals, forcing it closed and preventing trapped air and oil within
the compressor from exiting through the inlet filter. See SECTION 10 for further details.
Inlet Feed Valve (C)
- This (three-way solenoid) device supplies/vents the required pneumatic signal to
actuate the inlet poppet valve. When energized, it opens (pressurizes) the inlet poppet valve and when
de-energized, it closes (vents) it.
Minimum Discharge Pressure/Check Valve (G) –
This device maintains a minimum pressure (60 psig)
within the air/oil reservoir, thus insuring (lubrication/cooling) oil injection flow into the compressors. It also
prevents the back flow of compressed air from the customer’s piping back into the compressor package
when the compressor is not running. See for further details.
Oil Mixing Valve (L)
– This device prevents the compressor from operating at a pressure and
temperature combination that condenses water vapor in the oil system. The valve mixes cooled and hot
oil, prior to delivery to the oil filter and oil injection line, to maintain a system discharge temperature of
203º F. See SECTION 5 for further details.
Pressure Relief Valve (O)
– This device protects the pressure containing components of the compressor
package against high pressure exceeding 188.5 psig. See SECTION 11
for further details.
Oil Drain (N) -
This device allows the drainage of the oil charge held in the reservoir during oil change
operation. Note that the VS11 does not provide a ball valve, but an o-ring sealed threaded plug.
Blow Down Valve (P)
- This (two-way solenoid) device vents compressed air from the air/oil sump.
During compressor operation (e.g., compressor is running or has temporarily stopped due to line pressure
reaching unload pressure); the blow down valve remains energized (closed) and the air/oil reservoir
remains pressurized. When compressor operation is halted (e.g., by use of the red “STOP” controller
button, by loss of electrical energy, or by a shutdown condition), the valve is de-energized (normally open
state) and the air/oil reservoir is blown down.
Limit switch (Belt Break) –
This normally closed switch monitors the normal tilt that the compressor
achieves when the v-belts are intact. In case the v-belts break, the compressor pivots downward under
its weight and triggers the limit switch via a bracket, initiating a shutdown action at the AirSmart controller
See SECTION 8, page 49 for the further details.
Summary of Contents for VS-11
Page 10: ...13 18 604 Page 9 Figure 1 2 PACKAGE OUTLINE AIR COOLED 300CGA804 A Ref Drawing Page 1 of 2...
Page 11: ...13 18 604 Page 10 Figure 1 3 PACKAGE OUTLINE AIR COOLED 300CGA804 A Ref Drawing Page 2 of 2...
Page 28: ...13 18 606 Page 27 Figure 4 1 ELECTRICAL ENCLOSURE HARDWARE 302CGA810 D Ref Drawing...
Page 31: ...13 18 606 Page 30 Figure 4 2 PIPING AND INSTRUMENTATION ILLUSTRATION 300CGB797 B Ref Drawing...
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