Capacity Control Setpoints Screen; Figure 21 - Capacity Control Setpoints Screen - York OPTIVIEW YD Series Manual

SECTION 2 – OPTIVIEW CONTROL CENTER

CAPACITY CONTROL SETPOINTS SCREEN

FIGURE 21 - CAPACITY CONTROL SETPOINTS SCREEN

This screen displays the capacity control setpoints.
A Service Level password is required to access this
screen.
DISPLAY ONLY
All other parameters are view only and may be request-
ed by Product Technical Support or Chiller Engineer-
ing when assisting in troubleshooting.
PROGRAMMABLE (REQUIRES SERVICE
PASSWORD)
Change Setpoints
Pressing this button highlights the first of the change-
able parameters, LCHLT Setpoint Ramp Rate.
LCHLT Setpoint Ramp Rate
When the chiller is not running, the Active Setpoint
is set to Entering Chilled Liquid Temperature minus a
programmable offset (default 5°F), but not adjusted to
less than the programmed LCHLT setpoint. When the
compressor motor starts, the Active LCHLT Setpoint
is ramped from this value to the programmed LCHLT
Setpoint at the programmable LCHLT Setpoint Ramp
Rate (default 0.1°F/second). This keeps the chiller
from undershooting setpoint excessively during pull-
down. Any time the programmed setpoint is changed
68
during operation, the active setpoint is ramped to the
new value at this rate. (Adjustable 0.1°F/second to
2.0°F/second, Default 0.1°F/second)
LCHLT Setpoint Start Offset
The LCHLT setpoint offset above the Active setpoint.
(Adjustable 0.0°F to 10.0°F, Default 5.0°F)
Lead PRV Start Position
The desired start position of the Lead compressor PRV.
(Adjustable 0% to 100%, Default 0%)
Gear Ratio Override
Allows the technician to add a buffer above the operat-
ing surge plane by adjusting this parameter. (Adjust-
able 0.0000 to 7.0000, Default 0.0000)
NAVIGATION
Home
Navigates to the Home screen.
Capacity Control
Returns to the Capacity Control screen.
Anti-Surge Tuning
Navigates to the Anti-Surge Tuning screen.
FORM 160.79-O3
ISSUE DATE: 11/09/2018
LD27860
JOHNSON CONTROLS