the black sensor cord attached to the module. Reapply
power to terminals “120” and “L” and wait two minutes.
The module should not “time-out” after two minutes
because jumpering the sensor connections makes the
timing circuit “see” good oil pressure. The jumper
imitates the action of a small pressure switch located
in the sensor. This switch opens on low oil pressure
and closes on good oil pressure.
7. Measure between the “120” terminal and the “M”
terminal with the voltmeter. The meter should read full
line voltage showing that the circuit has not opened.
8. To check if the module will operate on 208/240 volts
as well as on 120 volts, change the scale of the
voltmeter (if necessary), to read up to 250VAC.
Without removing power, measure the voltage
between the “M” terminal and the “240” terminal. You
should read nearly twice the voltage as that read
between the “M” terminal and the 120“ terminal. This
is because Sentronic has a small control transformer
connected so that it can accept either 120V or
208/240V. It’s self-transforming action actually
enables it to step up its own voltage. By making this
voltage check, the transformer is being checked.
9. If the module successfully passes the above test
sequence it is fully functional. If the module fails any
of the above steps, it is faulty and should be replaced.
The Sentronic+
TM
oil pressure safety control replaces the
current Sentronic. The Sentronic+
TM
is a direct
replacement for mechanical devices and the current
Sentronic. The Sentronic+
TM
control offers the following
features:
Cap Tube Elimination
Sentronic+
TM
continues to add system reliability by
removing the traditional cap tube oil pressure controls that
are prone to refrigerant leaks.
Precise Timing
Identical to the current Sentronic the Sentronic+
TM
uses a
precise timing circuit that is not susceptible to low voltage
or brown out conditions. The memory in the timing circuit
remains the same, comparing low vs. sufficient oil pressure
time.
Electrical Noise Suppression
The Sentronic+
TM
has added an electronic noise
suppression feature that no longer requires the use of
shielded cables.
LED Diagnostics
Additional diagnostic capabilities have been added to
provide instant status of oil control.
• LED GREEN
Compressor has sufficient oil pressure.
• LED RED
Compressor has experienced insufficient oil
pressure for longer than two minutes Compressor
is off on oil control.
• RED/GREEN FLASHING
Compressor is experiencing erratic oil pressure
indicating a possible system issue.
Sentronic+™ Specifications
Cut-out 7-9 PSID
Cut-in 12-14 PSID
Time Delay 120 Seconds+/-15 Seconds
Max Control 500 VA; 120/240V
Sensor Torque 60-65 Ft./lb.
Wiring
The Sentronic+
TM
wiring remains the same. There are
several wiring schemes depending on control circuit
components. They are shown on pages 11 to 13.
Diagram (3A) - Standard control circuit
Diagram (4A) - Standard control with added alarm circuit
Diagram (5A) - Standard control with alarm and current
sensing relay circuit
Diagram (6) - Standard control with alarm, current sensing
relay and separate control voltage
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