Compressor Oil Cooler; Thermal Control (Thermostatic Mixing) Valve; Oil Reservoir; Compressor (G-D Eliminator) Oil Separator - Gardner Denver Electra-Screw EDEQHF Operating And Service Manual

24[
220
20(
180
. .
160
:
E
140
~
0
&
120
:
100
80
60
40
20 40
60
80 100 120
AMBIENT TEMP. . "F
FIGURE 5-4- DEW POINT TEMPERATURE VS. AMBIENT
TEMPERATURE (100% RELATIVE HUMIDITY)
COMPRESSOR OIL COOLER - (Figure 5-1, page 1,
this section) - The cooler fan is mounted on the com-
pressor motor shaft; air is exhausted through the oil
cooler and away from the unit. Do not obstruct airflow
to and from the oil cooler. Allow a minimum of two (2)
feet clearance around the cooler. Keep both faces of the
cooler core clean for efficient cooling of the compressor
oil.
THERMAL CONTROL (THERMOSTATIC MIXING)
VALVE (Figure 5-3, previous page) is installed in system
as shown in Figure 1-5, page 1, this section. This valve
is used to control temperature of the oil both air-cooled
radiator and water-cooled heat exchanger type oil
cooler systems. On start-up with unit cold, element is
open to bypass, allowing oil to pass directly from the
reservoir to compressor during warm-up. As oil warms,
element gradually closes to the bypass allowing more of
the oil from the cooler to mix with oil from the bypass.
After the unit is warmed up, mixing valve maintains oil
injection temperature into the compressor at a minimum
of 160"F. This system provides proper compressor
warm-up and prevents moisture contamination of the oil.
To check element, heat in oil -it should be fully extended
at 160° F. If unit shuts down due to high air discharge
temperature, the cause may be that the element is stuck
open to the bypass, in which case bypass lines (Figure
1-5, page 1, this section) will be hot to touch and lines
out of mixing valve much cooler. When flushing the oil
system, remove mixing valve and clean all parts thor-
oughly.
OIL RESERVOIR -The oil reservoir-separator combines
multiple functions into one vessel. The lower half is the
oil reservoir, providing oil storage capacity for the sys-
tem and the top portion, a primary oil separation means.
The reservoir also provides limited air storage for control
and gauge actuation.
OIL SE
COVER
OIL SEPA
HOUSING
~ PLEATED SEPARATOR
/
OIL RETURN LINE
FIGURE 5-5- OIL SEPARATOR
COMPRESSOR (G-D ELIMINATOR) OIL SEPARA-
TOR located in a separate housing, consists of a renew-
able cartridge-type separator element and provides the
final removal of oil from the air stream (Figure 5-5).
Oil impinging on the inside of the separator element
drains directly back into the oil reservoir by gravity. Oil
collected
outside the element is returned through tubing
to the compressor cylinder.
Oil carry-over through the service lines may be caused
by a faulty oil separator, overfilling of the oil reservoir, oil
that foams, oil return line malfunction, or water conden-
sate in the oil. If oil carryover
occurs, inspect the sepa-
rator only after it is determined that the oil level is not too
high, the oil is not foaming excessively, the oil return tube
from the bottom of the separator to the compressor
cylinder is not clogged or pinched off, the check valve
in the oil return is functioning properly, and there is not
water or an oil/water emulsion in the oil.
Oil carry-over malfunctions of the oil separator are usu-
ally due to using elements too long, heavy dirt or varnish
deposits caused by inadequate air filter service, use of
improper oil or using oil too long for existing conditions.
Excessive tilt angle of the unit will also hamper separa-
tion and cause oil carry-over.
Oil separator element life cannot be predicted; it will vary
greatly depending on the conditions of operation, the
quality of the oil used and the maintenance of the oil and
air filters. The condition of the separator can be deter-
mined by pressure differential or by inspection.
Pressure Differential Gauging - The "CHANGE SEPA-
RATOR" message will flash when the pressure differen-
tial across the oil separator reaches approximately 8
PSI. Replace the oil separator element at this time. If
ignored, the unit will shut down and the display will
indicate shutdown and the change separator LED will be
on when the pressure differential reaches
15
PSI.
13-8-610 Section 5 Page 5