©2008 Ingersoll Rand Company Page 13
Load Valve (1SV) [Std] – Normally closed 3-
way solenoid valve connected within the control
system to direct pressurized air into, or allow it
to vent out of, the airend inlet valve. The follow
of the pressurized air into or out of the inlet valve
causes the valve to open or close thereby load
or unload the compressor. This solenoid valve is
known schematically as 1SV, has a 120-volt AC
coil.
Blowdown Valve (3SV) [Std] – 3SV is the
schematic designation for the blowdown
solenoid valve. This valve is a 2-way normally
opened valve with a 120-volt AC coil. This valve
is wired in parallel with 1SV and when de-
energized allows the pressurized air in the sump
to be released back to the inlet valve allowing
the compressor to run in the unload mode. 3SV
is piped directly into the top of the separator lid
but prior to the minimum pressure check valve.
The exhaust port of 3SV is piped back into the
inlet filter housing to reduce noise as the
pressurized air vents. When the compressor is
stopped, 3SV automatically releases all internal
pressure.
Important: Always ensure that internal
pressure has been completely released prior to
removing caps, plugs, filters, etc.
Modulation Valve (5SV & 6SV) [Enh] – If the
modulation set point in the Intellisys controller is
turned off the modulation output stays off. If the
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