York MILLENNIUM YCAL0043SC, Manual

Page: 95 / 133

YORK INTERNATIONAL
95
FORM 150.62-NM2
ANALOG INPUTS – Pressure
Refer to the unit wiring diagram. Pressure inputs are
connected to the microboard 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 J4 of the microboard. System 2 discharge and
suction pressure transducers will be connected to J7 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 pres-
sure readout on the display would be zero.
The suction pressure transducers are optional on
YCAL0014 - YCAL0060. If the suction transducers are
not installed, a mechanical 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 microboard connections for the Discharge Trans-
ducers:
System 1 Discharge Transducer
J4-7 = +5 VDC regulated supply to transducer.
J4-12 = VDC input signal to the microboard. See the
formula above for voltage readings that
correspond to specific discharge pressures.
J4-8 = +5 VDC return
J4-9 = drain (shield connection = 0 VDC)
System 2 Discharge Transducer
J7-7 = +5 VDC regulated supply to transducer.
J7-12 = VDC input signal to the microboard. See the
formula above for voltage readings that
correspond to specific discharge pressures.
J7-8 = +5 VDC return
J7-9 = drain (shield connection = 0 VDC)
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