Setpoints Screen; Figure 48 - Setpoints Screen - York YK-EP B Operation & Maintenance Manual

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

FIGURE 48 - SETPOINTS SCREEN

OVERVIEW
This screen provides a convenient location for pro-
gramming the most common setpoints involved in the
chiller control. This screen also serves as a gateway to
a subscreen for defining the setup of general system
parameters.
DISPLAY ONLY
Leaving Chilled Liquid Temperature –
Setpoint
Displays the present setpoint to which the chiller is
operating whether controlled remotely or locally. This
value could come from a 0 to 20 mA, 4 to 20mA, 0
to 10VDC or 2 to 10VDC input in Analog Remote
mode, PWM signal in Digital Remote mode, E-Link or
SC-EQ communications interface in ISN mode, or a
locally programmed value.
Leaving Chilled Liquid Temperature Cycling –
Shutdown
Displays the Leaving Chilled Liquid Temperature at
which the chiller will shut down to avoid over-cool-
ing the building. This value is calculated by subtract-
ing the Leaving Chilled Liquid Temperature Cycling
116

SETPOINTS SCREEN

Offset – Shutdown from the Leaving Chilled Liquid
Temperature – Setpoint. If this value is below the abso-
lute minimum allowed shutdown temperature the mini-
mum value is displayed.
Leaving Chilled Liquid Temperature Cycling –
Restart
Displays the Leaving Chilled Liquid Temperature at
which the chiller will restart after it has shut down due
to over-cooling temperature. This value is calculated
by adding the Leaving Chilled Liquid Temperature Cy-
cling Offset – Restart to the Leaving Chilled Liquid
Temperature – Setpoint.
Current Limit Setpoint
Displays the active Current Limit Setpoint. In Local
mode, this is the locally programmed Current Limit
Setpoint. In ISN Remote mode, this is the setpoint
received from the E-Link or SC-EQ communications
interface. In Analog Remote mode, this is the setpoint
received via 0 to 10VDC, 2 to 10VDC, 0 to 20mA or
4 to 20mA input. In Digital Remote mode, this is the
Pulse width Modulation signal input.
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
LD14342
JOHNSON CONTROLS