Compressor Discharge System, Functional Description; Control System, Functional Description - Sullair TS-32S Operator's Manual And Parts List

Section 2
DESCRIPTION
valve. The thermal valve is fully open to the com-
pressor unit when the discharge temperature is
below 170°F (77°C) for all compressors, except
water-cooled 24KT models and all models operat-
ing at 150 psig (10.3 bar) and higher, which is fully
open up to 195°F (91°C). The fluid passes through
the thermal valve, the fluid stop valve, the main fluid
filter and directly to the compressor unit.
As the discharge temperature rises above 170°F
(77°C) for all compressors (195°F [91°C] for water-
cooled 24KT models and high pressure > 150 psig
[10.3 bar]), due to the heat of compression, the
thermal valve begins to close and a portion of the
fluid then flows through the cooler. From the cooler,
the fluid flows to the main filter, the fluid stop valve,
and on to the compressor unit. The fluid filter has a
replacement element and an integral pressure
bypass valve.
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 system.
Water-cooled models have a water pressure switch
to prevent operation with inadequate water pres-
sure.
2.5 COMPRESSOR DISCHARGE SYSTEM, FUNC-
TIONAL DESCRIPTION
Refer to Figures 2-2,
pressor unit discharges the compressed air/fluid
mixture through a discharge check valve into the
combination receiver/sump. The discharge check
valve prevents air/fluid in the receiver from return-
ing to the compression chamber after the compres-
sor has been shut down. The receiver has three
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 an internal baffle. The
direction of movement is changed and its velocity
significantly reduced, thus causing the large
droplets of fluid to fall to the bottom of the receiv-
er/sump. The fractional percentage of fluid remain-
ing in the compressed air collects on the surface of
the nested separator elements (primary and sec-
8
2-4A and 2-4B. The com-
ondary) as the compressed air flows through them.
Two return lines (or scavenge tubes) lead from the
bottom of each separator element to the low pres-
sure inlet region of the compressor unit. Fluid col-
lecting on the bottom of each separator is returned
to the compressor by a pressure difference
between the receiver and the compressor inlet.
Sight glasses are located in the return lines to
observe this fluid flow.
Controller microprocessor control monitors the
TM
condition of the separator elements by reading the
differential pressure on the digital display. At a dif-
ferential of 10 psig (0.7 bar), or greater, the oper-
ator will be told to service the separator elements.
At this time, separator element replacement is nec-
essary.
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 (3.4 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 of 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 the rated pressure of the tank.
All Sullair compressor models are equipped with
high pressure shutdown protection to shut down the
compressor at 30 psi above rated pressure. This
prevents the pressure relief valve from opening
under normal conditions, thereby preventing fluid
loss through the pressure relief valve. A tempera-
ture switch will shut down the compressor if the dis-
charge temperature reaches 235°F (113°C).
DO NOT remove caps, plugs, and/or other com-
ponents when compressor is running or pres-
surized.
Stop compressor and relieve all internal pressure
before doing so.
Fluid is added to the sump via a capped fluid filler
opening, placed low on the receiver tank to prevent
over-filling of the sump. Two sight glasses enables
the operator to visually monitor the sump fluid level.
2.6 CONTROL SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figures 2-5A, 2-5B,
dP1 on the Supervisor
2-5C and 2-5D. The