YORK INTERNATIONAL
115
FORM 150.62-NM7 (103)
ANALOG INPUTS – Pressure
Refer to the unit wiring diagram. Pres sure inputs are con-
nect ed to the microboard on plugs J4 and J7. These an-
a log inputs represent varying dc signals cor re spond ing
to varying pres sures. All volt ag es are in reference to the
unit case (ground).
System 1 discharge and suction pressures will be con-
nect ed to J4 of the microboard. System 2 dis charge and
suction pressure transducers will be connected to J7 of
the microboard.
The discharge transducers are optional on all units
ex cept the YCAL0287 – YCAL0377. If the dis charge
trans duc ers are not in stalled, no con nec tions are made
to the microboard and the dis charge pres sure readout
on the display would be zero.
The suction pressure transducers are optional on
YCAL0043 - YCAL0173. If the suction trans duc ers are
not installed, a mechanical low pressure switch will be
installed in its place, and the suction pres sure 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 .5VDC to 4.5VDC
over the 400 PSIG (27.5 BARG) range. Following is the
for mu la that can be used to verify the voltage output of
the trans duc er. All voltage reading are in ref er ence 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 Dis charge
Trans duc ers:
System 1 Discharge Transducer
J4-7 = +5VDC regulated supply to transducer.
J4-12 =VDC input signal to the microboard. See the
formula above for voltage read ings that
correspond to specifi c discharge pres sures.
J4-8 = +5VDC return
J4-9 = drain (shield connection = 0VDC)
System 2 Discharge Transducer
J7-7 = +5VDC regulated supply to trans duc er.
J7-12 = VDC input signal to the microboard. See the
formula above for voltage read ings that cor-
re spond to specifi c discharge pres sures.
J7-8 = +5VDC return
J7-9 = drain (shield connection = 0VDC)
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