Johnson Controls YORK YK MaxE, Operation Manual

Page: 42 / 184

JOHNSON CONTROLS
42
FORM 160.54-O1
CoMpressor sCreeN
(aLL “p” CoMpressors aNd stYLe f aNd Later ChiLLers
With g, q or h5-8 CoMpressors)
oVerVieW
This screen displays a cutaway view of the chiller com-
pressor, 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 im-
peller indicates whether the chiller is presently in a
RUn
condition. This screen also serves as a gateway to sub-
screens 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.
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 pres-
sure (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 pres-
sure. However, due to accuracy tolerances in transducer
design, differences can exist. Therefore to compensate
for differences between transducers and assure differ-
ential 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.
Oil Sump Temperature
Displays the temperature of the oil in the sump
Discharge Temperature
Displays the temperature of the refrigerant in its gaseous
state at discharge of the compressor as it travels to the
condenser.
Discharge Superheat
Displays the Discharge superheat, calculated as (Discharge
Temperature – Condenser Saturation temperature).
High Speed Thrust Bearing Limit Switch (LED)
Displays the present position of the High Speed Thrust
bearing Limit Switch. Extinguished when closed. This
is the normal position.
Vane Motor Switch (LED)
Illuminates when the vanes are completely closed.
Oil Return Solenoid (LED)
Illuminates when the solenoid is energized.
00549VIP
fig. 9
optiView Control Center