York YK Style H Operation Manual page 78

Table 65: Display only fields
Field/LED name
Active Oil Pressure Setpoint
(Variable Speed Oil Pump Only)
Oil Pump Control State
Oil Pressure Control State
Note: For fields requiring 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 66: Programmable
V09 software
Button
and earlier
Raise Service
Lower Service
Set Service
Auto Service
Oil Return Min Service
78
Description
The Variable Speed Oil Pump (VSOP), if installed, operates to control to a defined Oil
Pressure value. During prelube, and for the first 15 seconds after prelube, this setpoint
value is 45.0 PSID. During this time, this field will display the target value. After 15
seconds, this value will display the user-programmed setpoint Oil Pressure.
Indicates the current Control State of the Variable Speed Oil Pump.
Indicates the Oil Pressure Control State of the Variable Speed Oil Pump.
V10 and later
with YORK
Description
Chiller Access
Manager
This key puts the VSOP control into manual mode and increments the
JCI Service
present speed command by 0.5 Hz.
This key puts the VSOP control into manual mode and decrements the
JCI Service
present speed command by 0.5 Hz.
This key allows the user to specify a fixed manual speed at which the
JCI Service
VSOP will run.
This key returns the VSOP to automatic mode where control is based on
JCI Service
the Oil Pressure Setpoint.
To avoid an OIL – LOW TEMPERATURE DIFFERENTIAL cycling condition
from preventing a chiller start after running at low load conditions for
extended periods, the oil return solenoid (1SOL) is cycled closed when
the oil temperature gets too low on the P, Q, and H9 compressor chillers,
while the chiller is running. The Oil Return Min setpoint key appears on
the Oil Sump screen when the Chiller Style/Compressor Type Setpoint (on
the Operations screen) is set to P, Q or H9 compressor in Service access
level. This setpoint is programmable over the range of 80.0°F to 110.0°F
(default 95.0°F) and controls the oil return solenoid as follows:
JCI Service
• When the compressor is running and the Oil Sump Temperature
is less than the Oil Return Min Setpoint, close (de-energize) the Oil
Return Solenoid by de-energizing K12 relay.
• When the compressor is running and Oil Sump Temperature is
more than Oil Return Min plus 7°F, open (energize) the Oil Return
Solenoid by energizing K12 relay.
• During coastdown, the solenoid operation is not changed from
standard logic, it remains closed. During startup the operation is
not changed from standard logic, it remains closed for 1 minute
after System Run.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center