Compressor Screen; Figure 10 - Compressor Screen - York YST Operation Manual

FORM 160.67-O1
ISSUE DATE: 4/1/2015
noTe: OptiView Control Center Screens shown may NOT represent the exact screens according to the software version utilized.
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figure 10 - CoMpreSSor SCreen

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This screen displays a cutaway view of the chiller com-
pressor, revealing the impeller, and shows all condi-
tions associated with the compressor. In addition, with
the proper Access Level, the pre-rotation vanes may be
manually controlled. Animation of the compressor im-
peller indicates that the compressor drive shaft is rotat-
ing as sensed by the Turbine Rotating (Speed Switch)
digital input. This screen also serves as a gateway to
sub-screens for calibrating the pre-rotation vanes, cali-
brating the proximity probe, Variable Geometry Dif-
fuser (VGD) and viewing the oil sump parameters.
diSplaY onlY
oil pressure
Displays the pressure differential between the high
side oil pressure transducer (compressor bearing input)
and the low side oil pressure transducer (oil sump). The
displayed value includes offset pressure derived from
auto-zeroing during the system prelube. If either of the
transducers used to calculate this differential is out of
range, the display field will show XX.X.
The offset pressure is the pressure differential between
the high oil pressure (HOP) transducer and the low
oil pressure (LOP) transducer outputs during a three
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

CoMpreSSor SCreen

(3) second period beginning ten (10) seconds into the
system prelube. During this time, the transducers will
be sensing the same pressure and their outputs should
indicate the same pressure. However, due to accuracy
tolerances in transducer design, differences can ex-
ist. Therefore to compensate for differences between
transducers and assure differential pressure sensing ac-
curacy, the offset pressure is subtracted algebraically
from the differential pressure. The offset pressure cal-
culation will not be performed if either transducer is
out of range. The offset value will be taken as 0 PSI in
this instance.
oil Sump Temperature
Displays the temperature of the oil in the sump.
discharge Temperature
Displays the temperature of the refrigerant in its gas-
eous state at discharge of the compressor as it travels
to the condenser.
discharge Superheat
Displays the Discharge superheat, calculated as (Dis-
charge Temperature – Condenser Saturation tempera-
ture).
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