JOHNSON CONTROLS
58
FORM 160.78-O2
ISSUE DATE: 5/22/2017
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
DISPLAY ONLY
Evaporator Pressure
Displays the pressure in the evaporator.
[Evaporator Pressure] Override Threshold
Displays the evaporator pressure setpoint below which
the low evaporator pressure capacity control override
takes effect.
Condenser Pressure
Displays the pressure in the condenser.
[Condenser Pressure] Override Threshold
Displays the condenser pressure setpoint above which
the high condenser pressure capacity control override
takes effect.
Input Current % FLA
Displays the percent of useful job full load current
presently supplied to the chiller, determined from the
highest of the three phase Input Currents/(Input Job
FLA setting/0.9).
[Input Current % FLA] Override Threshold
Displays the active input current percent limit, which
is the minimum of Local Input Current Limit, Remote
Input Current Limit, and Pulldown Current Limit.
Motor Current % FLA
Displays the percentage of maximum motor current
delivered to the motor, determined from the highest of
the three phase Motor Currents/Maximum Motor Cur-
rent Limit.
[Motor Current % FLA] Override Threshold
Displays the active motor current percent limit, which
is a percentage of the minimum of VSD and motor
maximum current limits.
Entering Chilled Liquid
Displays the temperature of the chilled liquid as it en-
ters the evaporator.
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 (0°F
to 10°F, default 5°F) with a minimum value of the pro-
grammed LCHLT Setpoint. 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, perform-
ing 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 control
•
Motor Current- Motor Current Override is in con-
trol
•
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
