13–10–612 Page 40
neering for approval and for recommending the pipe
size. A special control group will be mounted on the
package at the factory. This group controls the oil stop
valve as well as not allowing the machine to run un-
loaded.
Remote mounted elevated coolers
have a maximum pipe length of 30 feet
(each way) and a maximum height of
20 feet with a minimum of fittings. En-
gineering will review all remote ele-
vated cooler applications and recom-
mend pipe size on an individual basis.
Customer Service should include the
engineering recommendation in the
special order sent to Engineering.
Kit number EAU68133 includes the oil stop valve,
check valve and flanges and must be installed on all re-
mote elevated coolers per FIGURE 5–4, page 38, and
the following instructions.
1.
Mount the check valve (90J113).
2.
Mount the drain valves in the lowest section of the
pipe on each side of the cooler connections.
3.
Mount the oil stop valve (90AR243) in the line after
the thermal mixing valve as shown.
Modifications to the control lines will be made at the fac-
tory to control the oil stop valve. Air to the oil stop valve
must come from the dry side of the reservoir cover, then
through the 3–way pneumatic valve. Control air to the
valve must come from the line between the tee and the
orifice in the blowdown muffler line. When the machine
blows down, it will activate the pneumatic valve which
will shut off the air and vent the line between the pneu-
matic control valve and the oil stop valve to the atmo-
sphere. This will shut the oil stop valve and prevent ex-
cessive oil from running into the reservoir. Failure to
install these parts could result in high oil carryover and
cause the machine to shutdown on high discharge tem-
perature.
THERMAL CONTROL (THERMOSTATIC MIXING)
VALVE (FIGURE 5–5) on current units is installed in
the system as shown in FIGURE 5–1, page 35. (On
early units this valve is in the line between the reservoir
and cooler.) This valve is used to control temperature
of the oil in both radiator and tube type oil cooler sys-
tems. The element is so designed that a portion of the
FIGURE 5–6 – THERMAL CONTROL
(THERMOSTATIC MIXING) VALVE
oil can flow through the oil cooler at all times. On start–
up with the unit cold, the element is open to bypass, al-
lowing oil to pass directly from the reservoir to the com-
pressor during warm–up. As oil warms, the 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, the mixing valve maintains oil in-
jected into the compressor at a minimum of 150
_
F. (On
early units compressor discharge temperature is main-
tained at a minimum of 70
_
F. above ambient tempera-
ture.) This system provides proper compressor warm–
up and prevents moisture contamination of the oil.
To check element, heat in oil – it should be fully ex-
tended at 150
_
F. (180
_
F. for early units). If the unit
shuts down due to high air discharge temperature, the
cause may be that the element is stuck open to the by-
pass, in which case lines 1 and 2 (FIGURE 5–1, page
35) will be hot to touch and lines 3 and 4 much cooler.
When flushing the oil system, remove the mixing valve
and clean all parts thoroughly.
COMPRESSOR OIL COOLER – WATER COOLED
HEAT EXCHANGER (FIGURE 1–3, page 2) – The
heat exchanger oil cooler is a multiple pass type, with
water in the tubes and oil in the shell. The oil tempera-
ture is controlled by the thermal control (thermostatic
mixing) valve. The optional water control valve may be
used to conserve water.
Oil cooler malfunction may be traced by checking pres-
sure at oil inlet and outlet. Fittings in the oil cooler at
these locations are equipped with a pipe tap for a
Summary of Contents for ELECTRA-SAVER EAU PD - 200 HP
Page 13: ...13 10 612 Page 3 FIGURE 1 4 STARTER BOX FIGURE 1 5 PACKAGE CONTROLLER AND STARTERS...
Page 16: ...13 10 612 Page 6 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 17: ...13 10 612 Page 7 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 40: ...13 10 612 Page 30 FIGURE 4 8 CONTROL SCHEMATIC COMPRESSOR AT FULL LOAD 214ECM797 Ref Drawing...
Page 42: ...13 10 612 Page 32 FIGURE 4 10 WIRING DIAGRAM 212EAP546 Ref Drawing...
Page 43: ...13 10 612 Page 33 FIGURE 4 11 AUTO SENTRY ES CONTROLLER DISPLAY...
Page 45: ...13 10 612 Page 35 FIGURE 5 1 FLOW DIAGRAM AIR OIL SYSTEM 215EAU797 Ref Drawing...
Page 65: ......