York YK-EP B Operation & Maintenance Manual page 39

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
from the differential pressure. The offset pressure cal-
culation 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 gas-
eous state at discharge of the compressor as it travels
to the condenser.
Discharge Superheat
Displays the discharge superheat, calculated as Dis-
charge Temperature – Condenser Saturation tempera-
ture.
High Speed Thrust Bearing Proximity Differ-
ential
Displays the present position of the High Speed Thrust
Bearing in relation to neutral. Locations are shown in
mils. Zero indicates that the bearing is in the normal
position.
Oil Pump Drive Command Frequency
Displays the electrical frequency of the Oil Pump Drive
motor. The frequency will go up or down to match the
pump motor output to the required oil pressure.
Vane Motor Switch (LED)
Illuminates when the vanes are completely closed.
Oil Return Solenoid (LED)
Illuminates when the solenoid is energized.
Pre-Rotation Vanes Control Mode
Access Level Required: SERVICE
Indicates whether the vanes are under manual or auto-
matic control.
Pre-Rotation Vanes Open (LED)
Access Level Required: SERVICE
Indicates whether the vanes are in the process of open-
ing.
Pre-Rotation Vanes Close (LED)
Access Level Required: SERVICE
Indicates whether the vanes are in the process of clos-
ing.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Full Load Amps
Access Level Required: SERVICE
Displays the motor current as a percentage of the Full
Load Amps (FLA) value.
Pre-Rotation Vanes Position
Access Level Required: SERVICE
This value displays the present position of the Pre-Ro-
tation Vanes as a percentage between 0 and 100%.
Phase A, B, C Current (Solid State Starter
Only)
Access Level Required: SERVICE
Displays the 3-phase motor current values being read
from the Solid State Starter.
Oil Pump Drive Command Frequency
(Variable Speed Oil Pump Only)
The value displays the present frequency at which the
oil pump is being commanded to run.
PROGRAMMABLE
Pre-Rotation Vanes Open (Manual)
Access Level Required: SERVICE
This key puts the vane control into manual mode and
sends an OPEN command to the vanes.
Pre-Rotation Vanes Close (Manual)
Access Level Required: SERVICE
This key puts the vane control into manual mode and
sends a CLOSE command to the vanes.
Pre-Rotation Vanes Hold (Manual)
Access Level Required: SERVICE
This key puts the vane control into manual mode and
sends a HOLD command to the vanes.
Pre-Rotation Vanes Auto
Access Level Required: SERVICE
This key returns the vane control to automatic mode.
Fault Acknowledge
This option allows clearing of the High Speed Thrust
Bearing Limit Switch safety shutdown.
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