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13–8–610 Page 32
FIGURE 5–5 – THERMOSTATIC MIXING VALVE
FIGURE 5–6 – OIL SEPARATOR
COMPRESSOR OIL COOLER – (FIGURE 5–1, page
27) – The cooler fan is mounted on the compressor mo-
tor shaft; air is exhausted through the oil cooler and
away from the unit. Do not obstruct air flow to and from
the oil cooler. Allow a minimum of two (2) feet (.6M)
clearance around the cooler. Keep both faces of the
cooler core clean for efficient cooling of compressor oil.
THERMAL CONTROL (THERMOSTATIC MIXING)
VALVE (FIGURE 5–5) is installed in the system as
shown in FIGURE 5–1, page 27. This valve is used to
control the temperature of the oil. On start–up with unit
cold, the element is open to bypass, allowing oil to pass
directly from the reservoir to compressor 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 injection temperature into the compressor at a mini-
mum of 170
_
F (77
_
C). This system provides proper
compressor warm–up and prevents moisture contami-
nation of the oil.
To check the element, heat in oil – it should be fully ex-
tended at 170
_
F (77
_
C). If the 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 5–1, page 27) will be hot to
touch and lines out of mixing valve much cooler. When
flushing the oil system, remove the mixing valve and
clean all parts thoroughly.
OIL RESERVOIR – The oil reservoir–separator com-
bines multiple functions into one vessel. The lower half
is the oil reservoir, providing oil storage capacity for the
system and the top portion, a primary oil separation
means. The reservoir also provides limited air storage
for control and gauge actuation.
COMPRESSOR (G–D ELIMINATOR) OIL SEPARA-
TOR located in a separate housing, consists of a re-
newable cartridge–type separator element and pro-
vides the final removal of oil from the air stream. See
FIGURE 5–6.
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 tub-
ing 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 con-
densate in the oil. If oil carryover occurs, inspect the
separator 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 com-
pressor 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
usually due to using elements too long, heavy dirt or
varnish deposits caused by inadequate air filter ser-
vice, use of improper oil, or using oil too long for existing
conditions. Excessive tilt angle of the unit will also ham-
per separation 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
Summary of Contents for ELECTRA-SCREW EDEQHH
Page 11: ...13 8 610 Page 3 200EDE797 Ref Drawing FIGURE 1 3 PACKAGE OIL LEVEL GAUGE SEPARATOR AIR FILTER...
Page 12: ...13 8 610 Page 4 202EDE797 Ref Drawing FIGURE 1 4 PACKAGE CONTROLLER STARTER BOX...
Page 15: ...13 8 610 Page 7 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 16: ...13 8 610 Page 8 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 33: ...13 8 610 Page 25 FIGURE 4 10 WIRING DIAGRAM FULL VOLTAGE DUAL CONTROL 204EDE546 Ref Drawing...
Page 34: ...13 8 610 Page 26 FIGURE 4 11 WIRING DIAGRAM WYE DELTA 205EDE546 Ref Drawing...
Page 53: ......