York YMC2 User Manual

JOHNSON CONTROLS
53
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
Leaving Chilled Liquid
Displays the temperature of the chilled liquid as it
leaves the evaporator.
Active LCHLT Setpoint
Displays the active temperature setpoint to which the
chiller is set to control liquid leaving the evaporator.
The Active Setpoint is a target to the Local, Remote or
BAS (ISN) LCHLT programmed setpoint, depending
on the control source selected. When the chiller is not
running, the Active Setpoint is set to Entering Chilled
Liquid Temperature - LCHLT Setpoint Start Offset
When the VSD starts, the Active LCHLT Setpoint is
ramped to the programmed LCHLT Setpoint at the
programmable LCHLT Setpoint Ramp Rate. When
the chiller is running, performing capacity control, any
change to the programmed LCHLT setpoint results in
a ramp from the old Active Setpoint value to the new
LCHLT setpoint value at the programmed LCHLT
Setpoint Ramp Rate.
Delta T
Displays the difference between the temperature of the
chilled liquid leaving the evaporator and the Leaving
Chilled Liquid Active Setpoint.
Control State
Displays the present source controlling the command
to the capacity control devices, based on conditions as
follows:
• Inactive – Capacity Control is not active
• Temperature Control – Capacity Control is active
with no overrides acting
• Input Current – Input Current Override is in con-
trol
• Motor Current – Motor Current Override is in
control
• Condenser Pressure – Condenser Pressure Over-
ride is in control
• Evaporator Pressure – Evaporator Pressure Over-
ride is in control
• Low LCHLT – LCHLT low temperature Override
is in control
Load Limit
Displays if any load limiting control is acting on the
temperature control output to the capacity control de-
vices. The field indicates the following:
• Inactive – Capacity Control is not active
• None – No limit is in effect
• Input Current
• Motor Current
• Condenser Pressure
• Evaporator Pressure
Head Pressure
Displays the difference between condenser refrigerant
pressure and evaporator refrigerant pressure.
Entering Condenser Liquid Temperature
Displays the temperature of the condenser liquid enter-
ing the condenser.
Capacity Control Output Devices
Displays the following for each of the devices that is
available: VSD (Variable Speed Drive), VGD (Variable
Geometry Diffuser) or HGBP (Hot Gas Bypass Valve)
• Active Output (LED): Indicates which device is
currently selected by the control for manipulation.
• Command: Displays the output command from
the control to the device in Hertz to the VSD or in
percent of full open to the VGD or HGBP valve.
• Feedback: Displays the present speed feedback
from the VSD or present position feedback from
the VGD.
• Control Mode: Displays whether the device is un-
der Automatic or Manual control.
• Active Min: Displays the prevailing minimum
value to which the control to the device is limited,
based upon surge controls or operating limits.
NAVIGATION
Home
Causes and instant return to the Home Screen.
Compressor
Causes an instant navigation to the Compressor Screen.
VSD
Causes an instant navigation to the VSD Screen.

York YMC2 Specifications

General

Brand	York
Model	YMC2
Category	Chiller
Language	English