Table 111: Programmable
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Local Cooling
Setpoint
Operator
Standard
This value allows the user to define the Leaving Chilled Liquid
Temperature that is to be maintained by the chiller. It is programmable
over the range of 36.0°F to 72.0°F (2.2°C to 22.2°C) water or, 10.0°F to
72.0°F (-12.2°C to 22.2°C) brine.
Default = 45°F (7.22°C).
Leaving
Chilled Liquid
Temperature
Cycling Offset –
Shutdown
Operator
Standard
This value allows the user to specify the Leaving Chilled Liquid
Temperature at which the chiller will shut down on a
LEAVING CHILLED
LIQUID – LOW TEMPERATURE
cycling shutdown. This is done by defining
an offset below the Leaving Chilled Liquid Temperature Setpoint.
It is programmable over a range of 1°F to 70°F (-17.2 to 21.1) below the
setpoint, to a minimum cut-out of 34°F (1.11°C) water or, 6°F (-14.4°C)
brine. It establishes the minimum allowed temperature for the Leaving
Chilled Liquid Temperature and prevents over-cooling of the building.
Anytime the Leaving Chilled Liquid Temperature Setpoint is increased, the
shutdown temperature is increased by 0.1°F/second to allow the chiller
time to unload to the new setpoint.
Leaving
Chilled Liquid
Temperature
Cycling Offset –
Restart
Operator
Standard
This value allows the user to specify the Leaving Chilled Liquid
Temperature at which the chiller will restart after a shutdown on a
LEAVING CHILLED LIQUID – LOW TEMPERATURE
cycling shutdown.
This is done by defining an offset above the Leaving Chilled Liquid
Temperature Setpoint. It is programmable over a range of 0°F to 37°F
above the setpoint, to a maximum restart value of 82°F.
The chiller will automatically restart when this temperature is reached.
This setpoint can be used to reduce chiller cycling by delaying the chiller
restart until the cooling load has increased.
Local Motor
Current Limit
Operator
Standard
Allows the user to specify the maximum allowed motor current (as a
percentage of FLA) when the chiller is running with Local Motor Current
control. When the motor current reaches this value, the pre-rotation
vanes will not be permitted to open further.
If the motor current rises above this value, the pre-rotation vanes will
close to reduce the current to this value.
Pulldown
Demand Limit Operator
Standard
Allows the user to specify the current limit value (as a percentage of
Full Load Amps) to which the chiller will be limited during the specified
pulldown limit time. This value will override the Motor Current Limit value
during this time period. This function is used to provide energy savings
following chiller start-up. Pulldown demand limit is ignored in BAS control
source because the BAS system is expected to use its algorithms to reset
current limit as required in that operating mode.
Pulldown
Demand Time Operator
Standard
Allows the user to set a period of time for which the pulldown demand
limit will be in effect after the chiller starts.
View
View
Generates the setpoints print report.
Table 112: Navigation
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Home
View
View
Returns the user to Home screen.
Setup
View
View
Navigates to the subscreen allowing setup of general system parameters.
Remote Control Operator
Standard
Navigates to the subscreen allowing setup of the Remote Control BAS
interface.
115
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
