York YK Style H Operation Manual page 34

Table 12: Display only fields
Field/LED name
Leaving Chilled Liquid Temperature
Setpoints – Setpoint
Leaving Chilled Liquid Temperature
Setpoints – Shutdown
Leaving Chilled Liquid Temperature
Setpoints – Restart
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 13: Programmable
V09 software
Button
and earlier
Local Leaving
Chilled Liquid
Operator
Temperature –
Setpoint
Leaving
Chilled Liquid
Temperature Operator
Cycling Offset –
Shutdown
Leaving
Chilled Liquid
Temperature Operator
Cycling Offset –
Restart
Low Evaporator
Service
Cutout
Refrigerant
Service
(Enabled/
Disabled)
34
Description
Displays the present setpoint to which the chiller is operating, whether controlled
locally or remotely.
Displays the Leaving Chilled Liquid Temperature at which the chiller shuts down on
Leaving Chilled Liquid – Low Temperature. This temperature is entered as an
offset with the Leaving Chilled Liquid Temperature Cycling Offset – Shutdown Setpoint
below. Although the offset setpoint is changed manually, the offset being used can
change automatically to prevent the Leaving Chilled Liquid Temperature from going
below the minimum allowed value: 34°F (water) or 6°F (brine). The offset being used is
displayed as Effective Offset. See the setpoint description below.
Displays the Leaving Chilled Liquid Temperature at which the chiller will restart after
it has shut down on LEAVING CHILLED LIQUID – LOW TEMPERATURE cycling
shutdown. This temperature is set as an offset using the Leaving Chilled Liquid
Temperature Cycling Offset – Restart Setpoint, displayed as OFFSET adjacent to this
value.
V10 and later
with YORK
Description
Chiller Access
Manager
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 86.0°F (water) or 10.0°F to 86.0°F (brine). The
maximum allowed setpoint with Heat Pump duty enabled is 86.0°F. A
Standard remote device can provide an analog signal 4 mA to 20 mA, 0 VDC to 10
VDC, or a 1 to 11 second PWM signal that changes the setpoint scaled by
the user defined Minimum and Maximum values. Additionally, an SC-EQ
communication interface in BAS Remote mode can define the setpoint
through a serial data stream.
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
Standard is programmable over a range of 1°F to 70°F below the setpoint, to a
minimum cutout of 34°F (water), or 6°F (brine). Anytime the Leaving
Chilled Liquid Temperature Setpoint is increased, the shutdown threshold
is ramped up from the present setpoint to the new setpoint at the rate of
0.1°F/s (adjustable) to prevent a nuisance shutdown.
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
Standard Temperature Setpoint. It is programmable over a range of 0°F to 60°F
above the setpoint, to a maximum restart value of 96°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.
This value is only available in Brine mode. It allows the user to specify the
JCI Service
Evaporator Pressure at which a safety shutdown is initiated.
When an Evaporator Refrigerant Sensor has been installed, it must be
JCI Service
enabled via this toggle before the system can use the new, enhanced
resolution input.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center