York YK Style H Operation Manual page 128

Table 128: Display only fields
Field/LED name
Leaving Chilled Liquid Temperature Displays the temperature of the liquid as it leaves the evaporator.
Leaving Chilled Active Setpoint
Quick Pulldown in Effect (LED)
Note: For fields requiring access level of SERVICE. Service Technicians 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 129: Programmable
V09 software
Button
and earlier
Change
Service
Setpoints
VSD Start
Service
Frequency
Mapping
Service
Enable
Pulldown
Service
Override Time
128
Description
Displays the setpoint to which the Leaving Chilled Liquid is being controlled.
Illuminates while a Quick Pulldown is in effect. This is in effect from a start initiate until
the Quick Pulldown Setpoint Offset has been reached or the Pulldown Override Time
has elapsed, whichever occurs first.
V10 and later
with YORK
Description
Chiller Access
Manager
Used to enter the following setpoints. Pressing this key places a green
selection box around the first changeable setpoint. Use the ▲ and ▼ keys
JCI Service to place the selection box around the desired setpoint. With the setpoint
selected, press the Enter key. A dialog box appears with the range of
settings.
The VSD Start Frequency is as follows:
• 60 Hz units with quick start enabled equal 30 Hz to 45 Hz (default 45
Hz)
JCI Service
• 50 Hz units equal 25 Hz to 37.5 Hz (default 37.5 Hz)
This setpoint is the same as shown on the ACC Details Screen. It can be
programmed on either the ACC Screen or the Quick Start Screen. It sets
the VSD Start Frequency from which the speed will ramp from.
(0.5°F to 4.0°F; default 1.0°F)
This is the same setpoint as shown on the ACC Details Screen. It can
JCI Service
be programmed on either the ACC Screen or the Quick Start Screen. It
sets the Delta T needed to be met to enable surge mapping and speed
reduction initially on startup.
(0 min to 15 min; default 10 min)
This setpoint is the length of time the PRV is held open (Quick Restart)
and the ACC speed (Quick Restart and Quick Normal Start) is increased
JCI Service
on startup if the Quick Pulldown Setpoint Offset is not reached. This could
be due to hitting current limit during the pulldown. If the Quick Pulldown
Setpoint Offset is not reached in the Pulldown Override Time, PRV and
ACC speed control will revert back to normal automatic control.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center