Primary Compressor Screen; Figure 12 - Primary Compressor Screen - York YK-EP B Operation & Maintenance Manual

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

FIGURE 12 - PRIMARY COMPRESSOR SCREEN

OVERVIEW
This screen displays a cutaway view of the chiller com-
pressor, revealing the impeller, and shows all condi-
tions associated with the compressor. With the proper
access level, the Pre-Rotation Vanes may be manually
controlled. Animation of the compressor impeller indi-
cates whether the chiller is presently in a RUN condi-
tion. This screen also serves as a gateway to subscreens
for calibrating the Pre-Rotation Vanes, calibrating the
Proximity Probe, configuring the Hot Gas Bypass, or
providing advanced control of the Compressor Motor
Variable Speed Drive.
For fields requiring access level of SER-
VICE. Qualified service technicians should
refer to the OptiView Control Center
Service for operation instructions and ex-
planations of all programmable setpoints
and displayed values.
38

PRIMARY COMPRESSOR SCREEN

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
(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
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
00549VIP
JOHNSON CONTROLS