Compressor Screen - York YK Style H Operation Manual

Compressor screen

Figure 33: Compressor screen (screen shown is a unit with proximity probe)
This screen displays a cutaway view of the chiller compressor, revealing the impeller, and shows
all conditions associated with the compressor. In addition, with the proper access level, the Pre-
rotation Vanes may be manually controlled. Animation of the compressor impeller indicates
whether the chiller is presently in a RUN condition. This screen also serves as a gateway to
subscreens.
Note: Requires a login access level of SERVICE. Service Technicians must refer to the OptiView
Control Center - Service Instructions (Form 160.76-M1) for operation instructions and explanation
of all programmable setpoints and displayed values.
Table 30: Display only fields
Field/LED name
Oil Pressure
Oil Sump Temperature
Discharge Temperature
50
Description
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 shows 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
second period beginning ten 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 exist. Therefore to compensate for differences between transducers and assure
differential pressure sensing accuracy, the offset pressure is subtracted algebraically
from the differential pressure. The offset pressure calculation will not be performed if
either transducer is out of range. The offset value will be taken as 0 psi in this instance.
Displays the temperature of the oil in the sump
Displays the temperature of the refrigerant in its gaseous state at discharge of the
compressor as it travels to the condenser.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center