Gardner Denver ELECTRA-SAVER II Service Manual page 20

1.
2.
Adjust the upper limit pressure to 15 PSIG by turning
the slotted screw (pressure) near the top of the switch
Clockwise movement of the screw raises the pressure
counterclockwise lowers the pressure Note approx-
imate pressure setting is indicated on the range scale
on left face of switch
Adjust the lower limit pressure to 10 PSIG by turning
the slotted screw (differential) near the bottom of the
switch until the cam-shaped calibrated dial under the
pressure setting screw indicates about 1/4 of full scale
reading from lowest setting Clockwise movement of
the screw reduces the differential counterclockwise
increaaes differential Note differential range (1 -18
PSI) is indicated by marks on the cam-shaped dial
If a unit with Constant Speed with Low Demand Mode
Switch shuts down from low oil pressure pressing the
ON button will restart the unit
Since the Automatic Start/Timed Stop control is an
automatic starting type a reset relay is used as a positive
means to interrupt the circuit o'n either a low oil pressure
shutdown or high discharge air temperature shut-down to
restart these units press the black bar marked RESET and
then press the ON button
CAUTION
Do not continue to restart the unit if the same
malfunction occurs within a short period of time Find
and correct the trouble before resuming operation
This switch should be checked periodically to assure
proper operation To check disconnect the timed-opening
instantaneous closing time delay relay from the system at
point 10 (see wiring diagram). Try to start unit — unit should
not run — if it does switch is inoperative and should be
replaced Be sure to reconnect the time delay relay after
checking
Low Oil Pressure Time Delay Switch (Figures 1-4 & 3-4)
located in the control panel enclosure is wired into the
control circuit to provide the 10-second delay required for
the compressor oil pressure to rise to 10-15 PSIG and
energize the low oil pressure switch circuit
MANUAL OPERATOR TAB
1
~N.C. TIMING CONTACT
MOVEABLE INSTAN.
1
TANEOUS CONTACT
CARRIER - DO NOT L
uSE AS A MANUAL
OPERATOR
I
TIME SETTING
AOJUSTING XREW J
A75852
FIGURE 3-4 – LOW OIL PRESSURE
TIME DELAY SWITCH
To check the time delay switch setting
1.
Pull main breaker switch
2. Move black timer tab located on the left half of relay
block to the ON position and hold Timer will begin to
run for set time
the right half of the relay block the contacts will open
when the preset time runs out
4.
Adjustment of time delay setting is made by turning
screw on lower right face of relay block to a faster(F) or
slower (S) setting. Recheck setting of relay as in No. 2
and 3 above each time screw is turned
, WARNING
Timer is factory set at 10 seconds NEVER ATTEMPT
TO ADJUST THE TIMING RELAY FOR MORE
THAN 15 SECONDS DELAY — serious compressor
damage may result from operation without lubrication
for even a short period
~CAUTION
INSTRUMENTS & GAUGES (Figures 3-1 & 1-4) - Both
control system instrument panels incorporate the following:
Hourmeter - A continuous reading (nonreset) type hour-
meter displays the accumulated operating time of the unit
and provides a convenient means for scheduling changes
of oil supply and servicing of filters separators and other
devices
Air Pressure Geuge - A direct reading air pressure gauge
indicates the final discharge air pressure at the discharge
manifold
Discharge Air Temperature Gauge - A direct reading
temperature gauge indicates the compressor discharge air
temperature
Pressure Differential Gauge - This gauge reads the
pressure differential across the oil separators providing a
continuous monitoring of their condition and indicates
when changing of the elements is required
Air Filter Indicator- An air filter indicator is located on the
instrument panel and indicates when the air filter requires
servicing
Oil Filter Indicator- An oil filter indicator is located on the
head of the oil filter and indicates when oil filter needs
servicing
a-
ADJUSTING SCREW
RETAINING RING
~ SPRING
AIR
IN
B75121
w
/ \
3. Observe the action of the right hand set of contacts on
FIGURE 4-4 – MINIMUM DISCHARGE
PRESSURE VALVE
13-9-630 Section 4 Page 4