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JOHNSON CONTROLS
153
SECTION 9 – SERVICE AND TROUBLESHOOTING
Form 150.63-NM9
Issue date: 5/20/2021
9
Table 30 -
Pressure Transducers
0-400 PSIG SUCTION
PRESSURE
TRANSDUCER
0-650 PSIG DISCHARGE
PRESSURE
TRANSDUCER
PRESSURE
PSIG
VOLTAGE
VDC
PRESSURE
PSIG
VOLTAGE
VDC
0
0.5
0
0.5
50
1.0
81.25
1.0
100
1.5
162.5
1.5
150
2.0
243.75
2.0
200
2.5
325
2.5
250
3.0
406.25
3.0
300
3.5
487.5
3.5
350
4.0
568.75
4.0
400
4.5
650
4.5
RED WIRE = 5 V, BLACK WIRE = 0 V, WHITE/
GREEN WIRE = SIGNAL
TEST POINTS:
Suction Pressure:
System 1: ....................................Microboard J7-10 to J7-9
System 2: ....................................Microboard J9-10 to J9-9
Discharge Pressure:
System 1: ....................................Microboard J7-11 to J7-7
System 2: ....................................Microboard J9-11 to J9-7
The I/O board connections for the Discharge Transduc-
ers:
System 1 discharge transducer
J7-6 = +5 VDC regulated supply to transducer.
J7-11 = VDC input signal to the microboard. See the
formula above for voltage readings that corre-
spond to specific discharge pressures.
J7-7 = +5 VDC return.
J7-2 = drain (shield connection = 0 VDC).
System 2 discharge transducer
J9-6 = +5 VDC regulated supply to transducer.
J9-11 = VDC input signal to the microboard. See the
formula above for voltage readings that correspond to
specific discharge pressures.
J9-7 = +5 VDC return
J9-2 = drain (shield connection = 0 VDC).
The suction transducers have a range from 0 psig to
400 psig (27.5 barg). The output will be linear from 0.5
VDC to 4.5 VDC over the 400 psig (27.5 barg) range.
The following is a formula that can be used to verify
the voltage output of the transducer. All voltage read-
ings are in reference to ground (unit case).
V = (Pressure in psig x .02) + .5
or
V = (Pressure in barg x .29) + .5
where V = DC voltage input to microboard
Pressure = pressure sensed by transducer
The following are the I/O board connections for the
Suction Transducer:
System 1 suction transducer
J7-5 = +5 VDC regulated supply to transducer.
J7-10
=
VDC input signal to the microboard.
See the formula above for voltage readings
that correspond to specific suction pressures.
J7-9 = +5 VDC return.
J7-1 = drain (shield connection = 0 VDC).
System 2 suction transducer
J9-5 = +5 VDC regulated supply to transducer.
J9-10
=
VDC input signal to the microboard.
See the formula above for voltage readings
that correspond to specific suction pressures.
J7-9 = +5 VDC return.
J7-11 = drain (shield connection = 0 VDC).
Summary of Contents for YCUL0020
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