Section 2
DESCRIPTION
8
ter change, the gauge will rarely show red under
normal operating conditions.
The fluid stop valve prevents fluid from filling the
compressor unit when the compressor is shut
down. When the compressor is operating, the fluid
stop valve is held open by air pressure from the
compressor unit allowing a free flow of fluid from
the receiver/sump back to the compressor unit. On
shutdown, the compressor unit pressure is
reduced, causing the fluid stop valve to close and
isolate the compressor unit from the cooling sys-
tem.
Water-cooled versions of the compressor have a
water-flow regulating valve which operates to con-
serve water during periods of varying load on the
compressor. The same valve automatically shuts
off the water supply when the compressor is shut
down. In addition, water-cooled models have a
water pressure switch to prevent operation with
inadequate water pressure.
2.5 COMPRESSOR DISCHARGE SYSTEM, FUNC-
TIONAL DESCRIPTION
Refer to Figures 2-3. The compressor unit dis-
charges the compressed air/fluid mixture through a
discharge check valve into the combination receiv-
er/sump. The discharge check valve prevents air in
the receiver from returning to the compression
chamber after the compressor has been shut down.
The receiver has three basic functions:
1. It acts as a primary fluid separator.
2. It serves as the compressor fluid sump.
3. It houses the final fluid/air separator elements.
The compressed air/fluid mixture enters the receiv-
er and is directed against the far side of the tank,
where its direction of movement is changed and its
velocity significantly reduced. This causes large
droplets of fluid to collect, separate and fall to the
bottom of the receiver/sump. The fractional per-
centage of fluid remaining in the compressed air
collects on the surface of the dual separator ele-
ments (primary and secondary) as the compressed
air flows through them. Two return lines (or scav-
enge tubes) lead from the bottom of each separator
element to the low pressure inlet region of the com-
pressor unit. Fluid collecting on the bottom of each
separator is returned to the compressor by a pres-
sure difference between the receiver and the com-
pressor inlet. Sight glasses are located in the return
lines to observe this fluid flow. A gauge, located on
the instrument panel, will be in the red zone when
excessive pressure drop through the separator
develops. At this time, separator element(s)
replacement is necessary.
The receiver is an ASME pressure vessel. A combi-
nation minimum pressure/check valve, located
downstream from the separator, assures a mini-
mum receiver pressure of 50 psig (3.5 bar) during
full load operation. This pressure is necessary for
proper air/fluid separation and proper fluid circula-
tion while supplying air to the system. This valve
also acts as a check valve preventing compressed
air in the service line from bleeding back into the
receiver on shutdown and during operation on the
compressor in an unloaded condition.
A pressure relief valve (located on the wet side of
the separator) is set to open if the sump pressure
exceeds 175 psig (12.1 bar).
All Sullair compressor models are equipped with a
high pressure shutdown switch to shut down the
compressor at 135 psig (9.3 bar). This prevents the
pressure relief valve from opening under normal
conditions, thereby preventing fluid loss through the
pressure relief valve. A temperature switch will shut
down the compressor if the discharge temperature
reaches 240ºF (116ºC).
Fluid is added to the sump via a capped fluid filler
opening, placed low on the receiver tank to prevent
overfilling of the sump. A sight glass enables the
operator to visually monitor the sump fluid level.
2.6 CONTROL SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-4. The purpose of the compres-
sor control system is to regulate the amount of air
being compressed to match the amount of com-
pressed air being used.
The capacity control system consists of a Sullicon
Control, a butterfly valve (located on the compres-
sor air inlet), a spiral valve, a pressure switch, two
(2) solenoid valve pressure regulators, and two (2)
control line filters. The functional description of the
control system is described below in four distinct
phases of compressor operation. The following
applies to all TS-20 Series compressors. This
description applies to any compressor with an oper-
ating range of 100 to 110 psi (6.9 to 7.6 bar). A com-
pressor with any other pressure range would oper-
DO NOT remove caps, plugs, and/or other compo-
nents when compressor is running or pressur-
ized.
Stop compressor and relieve all internal pressure
before doing so.
To Next Page
Loading...
