JOHNSON CONTROLS
103
FORM 150.63-NM8 (1020)
3
ANALOG INPUTS – Pressure
Refer to the unit wiring diagram.
Pressure inputs are
connected to the I/O Board on plugs J4 and J7. 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 I/O Board. System 2 discharge and
suction pressure transducers will be connected to J9 of
the I/O Board.
The discharge transducers are optional on all units. If the
discharge transducers are not installed, no connections
are made to the I/O Board and the discharge pressure
readout on the display would be zero.
The suction pressure transducers are optional on all
units. If the suction transducers are not installed, a me-
chanical low pressure switch will be installed in its place,
and the suction pressure readout on the display will be 0
PSIG when the LP switch is open, and 200 PSIG (13.79
BARG) when the LP switch is closed.
The discharge transducers have a range from 0 to 400
PSIG. The output will be linear from .5
VDC
to 4.5
VDC
over the 400 PSIG (27.5 BARG) range. Following is the
formula that can be used to verify the voltage output of
the transducer. All voltage reading are in reference to
ground (unit case).
V = (Pressure in PSIG x .01) + .5
or
V = (Pressure in BARG x .145) + .5
where V = dc voltage output
Pressure = pressure sensed by transducer
The I/O Board connections for the Discharge Trans-
ducers:
System 1 Discharge Transducer
J7-6
= +5VDC
regulated supply to transducer.
J7-11
=
VDC
input signal to the I/O Board.
See the
formula above for voltage readings that
correspond to specific discharge pressures.
J7-7
= +5VDC
return
J7-2
= drain (shield connection = 0
VDC
)
System 2 Discharge Transducer
J9-6
= +5VDC
regulated supply to transducer.
J9-11
=
VDC
input signal to the I/O Board.
See the
formula above for voltage readings that cor
respond to specific discharge pressures.
J9-7
= +5VDC
return
J9-2
= drain (shield connection = 0
VDC
)
Summary of Contents for YCUL0045E
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