Johnson Controls York YKEP Series User Manual

FORM 160.77-O2
ISSUE DATE: 11/15/2011
JOHNSON CONTROLS
44
SECTION 3 - YKEP CONTROL PANEL OPERATION
not running, and there are no system faults or alarms.
The offset pressure is the pressure difference between
the high oil pressure (HOP) transducer and the low oil
pressure (LOP) transducer outputs. During this time,
the transducers should be sensing the same pressure.
However, due to accuracy tolerances in transducer de-
sign, differences may exist in these pressure readings.
To compensate for these differences between transduc-
ers and assure differential pressure sensing accuracy,
the offset pressure is subtracted algebraically from the
oil (differential) pressure value. The offset pressure
calculation will not be performed if either transducer
is out of range and the offset value will be 0 PSI in this
instance.
Oil Sump Temperature
Displays the temperature of the oil in the sump (pro-
vided by RTD TE-140).
Discharge Temperature
Displays the temperature of the refrigerant (vapor) at
discharge of the compressor before the refrigerant en-
OVERVIEW
This screen displays a background cutaway view of
the chillers primary compressor, revealing the impeller
and also shows all conditions associated with the com-
pressor. The pre-rotation vanes may be manually con-
trolled from the appropriate access level. This screen
also serves as a gateway to sub-screens for calibrating
the Proximity Probe, Pre-rotation Vanes, and the Vari-
able Geometry Diffuser.
DISPLAY ONLY
Oil Supply Pressure
Displays the pressure differential between the high
side oil pressure transducer (HOP, located between oil
filter output and compressor bearing input) and the low
side oil pressure transducer (LOP, located between oil
sump and compressor housing). The displayed value
includes offset pressure derived from auto-zeroing
during the system prelube. The display field will show
_ _._ when either of the transducers used to calculate
oil pressure are out of range. The zero function occurs
when the RESET button is pressed, the oil pumps are
PRIMARY COMPRESSOR SCREEN
LD15399
FIGURE 25 - PRIMARY COMPRESSOR SCREEN

Johnson Controls York YKEP Series Specifications

General

Brand	Johnson Controls
Model	York YKEP Series
Category	Chiller
Language	English