Gardner Denver ELECTRA-SAVER II Service Manual page 40

dew point temperature at your operating pressure and
ambient temperatures
To decrease water flow (increase compressor discharge
air temperature) turn the adjusting screw from left to right
increasing spring tension. To increase water flow (de-
crease compressor discharge air temperature) turn the
adjusting screw in the opposite direction. The groove at
the lower edge of the adjusting screw is an index line for
use with the index scale O to 8 in obtaining a desired
setting
These valves must be handled with care and proper tools
and techniques must be used when working on the valve
Care must be used when handling the capillary tube a kink
or break in the tubing or connections will make the valve
inoperative Never attempt to change capillary length. Ex-
cess capillary tube should be carefully coiled and placed
so that damage will not occur in normal maintenance or
traffic past unit
If a leak develops through the packing tighten the packing
gland nut firmly with a wrench to reseat the packing around
the valve stem then back off the nut until loose and finally
retighten the nut finger tight Tightening the packing nut
too tight may cause erratic operation An occasional drop
of oil on the valve stem at the packing nut will prolong
packing life
If the valve malfunctions check for bent or binding (paint
or corrosion etc) valve stem foreign material in the valve,
erosion or thermal system (capillary failure If foreign
material or scale is likely, the use of a strainer in the inlet
water line is recommended
WATER SHUTOFF VALVE –
WATER-COOLED
HEAT EXCHANGER (Optional Equipment But Re
commended) (Figure 1-5) — A magnetic solenoid-operated
water shutoff valve rated at 150 PSIG water pressure should
be mounted in the water outlet line after the oil cooler.
The valve should be wired into the compressor control
circuit in such a manner that valve opens to allow water
to flow any time the ON-OFF push button is ON and the
compressor is running When compressor stops under
automatic control or is shut off manually, the valve
should close stopping water flow through the system
OIL RESERVOIR – The oil reservoir-separator combines
two functions into one vessel The horizontal section is the
oil reservoir, providing oil storage capacity for the system
and a primary oil separation means The vertical section
contains the final oil separator and has the discharge line
mounted on the upper flange The reservoir also provides
limited air storage for control and gauge actuation
COMPRESSOR OIL SEPARATOR (Figure 9-5) located in
the vertical section of the oil reservoir consists of two re-
newable cartridge type separator elements and provides
the final removal of oil from the air stream Oil from inside
the separator elements is returned through tubing to the
compressor cylinder. Oil impinging on the outside of the
first stage of the dual-element separator drains directly
back into the oil reservoir by gravity.
Oil carry-over through the service lines maybe caused by a
faulty separator, faulty minimum pressure valve overfilling
of the oil reservoir, oil that foams or oil return line mal
function If oil carry-over occurs inspect the separators
only after it is determined that the oil level is not too high
OIL
cc
,. ..-. . \
)
NIFOLD
GE SEPARATOR
Es
F
--
TOP
PLATE
-,OIL RESERVOIR
,"
TOWER
– FIRST STAGE SEPARATOR
ti-
FLEXIBLE TUBE.
-.4 ,
C75320
FIGURE 9-5. –
OIL SEPARATOR
the oil is not foaming excessively, the oil return line from
the discharge manifold to the compressor cylinder is not
clogged or pinched off, and the return tubes inside the
separators are not loose or broken
Oil carryover malfunctions of the oil separator are usually
due to using the elements too long heavy dirt or varnish
deposit caused by inadequate air filter service use of im
proper oil or using oil too long for existing conditions
Ruptured or collapsed separator elements are usually due
to heavy dirt or varnish buildup in the filtering material
Excessive tilt angle of the unit will also hamper separation
and cause oil carryover.
Oil separator element life cannot be predicted it will vary
greatly depending on the conditions of operation the qua}
ity of oil used and the maintenance of the oil and air filters
The condition of the oil separator can be determined by
pressure differential gauging or by inspection
The smaller second-stage (inner element may not need
replacement as often as the first-stage element Careful
inspection or pressure differential gauging plus operating
experience will determine the change interval
The oil separator pressure differential gauge reads differ-
ential across both separator elements The first-stage
element and depending on condition, the second stage
element should be changed when the oil separator gauge
indicates 8 PSI differential with the unit on load at rated
pressure Usually the first stage will contribute most of the
pressure differential It may be possible to reuse the sec
ond stage several times before an appreciable contribution
to total pressure differential is noticed and the second
stage changed
Removal
Of Oil Separators For Inspection Or Re
placement
1.
Disconnect oil return to compressor tubing at tee
near discharge manifold flange on top plate
13-9-630 Section 5
Page 6