FORM 150.66-NM3
ISSUE DATE: 09/25/2020
151
JOHNSON CONTROLS
SECTION 9 - SERVICE AND TROUBLESHOOTING
9
Analog Inputs – Pressure
Refer to the unit wiring diagram.
Pressure inputs are
connected to the microboard on plugs J7 and J79. These
analog inputs represent varying dc signals correspond-
ing to varying pressures. All voltages are in reference
to the unit case (ground).
System 1 discharge and suction pressures will be con-
nected to J7 of the microboard. System 2 discharge and
suction pressure transducers will be connected to J9 of
the microboard.
The discharge transducers are optional on all units. If
the discharge transducers are not installed, no connec-
tions are made to the microboard and the discharge
pressure readout on the display would be zero.
The suction pressure transducers are standard on all
YCAL’s. The suction pressure transducers have a range
of 0 psig to 400 psig. The output will be linear from
0.5 VDC to 4.5 VDC over the 400 psig (27.58 barg)
range.
The discharge transducers have a range from 0 psig to
650 psig. The output will be linear from 0.5 VDC to
4.5 VDC over the 650 psig (44.82 barg) range. Fol-
lowing is the formula that can be used to verify the
voltage output of the transducer. All voltage readings
are in reference to ground (unit case).
V = (Pressure in psig x 0.006) + .5
or
V = (Pressure in BARG x 0.09) + .5
where V = dc voltage output
Pressure = pressure sensed by transducer
The microboard connections for the Discharge Trans-
ducers:
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 cor
-
respond to specific discharge pressures.
J9-7 = +5 VDC return
J9-2 = drain (shield connection = 0 VDC)
Summary of Contents for YCAL Series
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