York YR Manual page 41

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
Offset Pressure (Not Displayed)
The Offset Pressure is a calculated value that is used to
calculate the differential pressure. The Offset Pressure
is the pressure differential between the corresponding
transducers during the first 15 seconds of Start Se-
quence Initiated. This is the transducer auto-zeroing.
During this time the transducers will be sensing the
same pressure and their outputs should be equal. How-
ever, due to accuracy tolerances in transducer design,
differences can exist. Therefore, to compensate for dif-
ferences between transducers and assure differential
pressure sensing accuracy, the Offset Pressure is sub-
tracted from the differential pressure. (Certain operat-
ing conditions could require the auto-zeroing to be dis-
abled. This must never be done by anyone other than a
qualified service technician.
Oil Supply Solenoid (LED)
Indicates whether the solenoid is energized.
Low Separator Oil
(Software version C.OPT.05.08.303 and later)
Illuminated when there is insufficient oil level in the
Oil Separator. Otherwise, it is extinguished.
New production chillers after second quarter 2007 are
equipped with an Oil Level Sensor in the Oil Separator.
For proper oil level detection on chillers equipped with
this sensor, Microboard Program Jumper JP9 must be
positioned properly. For chillers not equipped with this
sensor, if JP9 is not positioned properly, the chiller will
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW™ CONTROL CENTER
shutdown on this safety each time the chiller is started.
Service Technicians refer to OptiView Control Center
Service Instructions (Form 160.81-M1 for program
jumper positioning. This LED indicator is displayed
on this screen whether the oil level sensor is present
or not.
Condenser Saturation
Displays the saturation temperature in the condenser.
Evaporator Pressure
Displays the refrigerant pressure in the evaporator.
Condenser Pressure
Displays the refrigerant pressure in the condenser.
Programmable
Auto Zero (Enabled / Disabled)
Access Level Required: SERVICE
Allows the user to enable or disable the transducer
auto-zeroing that is used to calculate the offset pres-
sure. (Refer to the description of the Offset Pressure).
Service Technicians refer to OptiView Control Center
Service Instructions (Form 160.81-M1).
Navigation
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Access Level Required: VIEW
Causes an instant return to the HOME screen.
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