Figure 26 - Capacity Control Setpoints Screen 1 - York YST Operation Manual

FORM 160.67-O1
ISSUE DATE: 4/1/2015
When the Select Control key is set for
HGV, the tuning parameters entered
are also used by the HGV Temperature
Controller.
evaporator pressure
Screen: Capacity Controls
SP (PSP1) Range:
Water: 25.0-35.0 PSIG
Brine: 6.0-35.0 PSIG
PID Tuning Ranges - P: 0.00-5.00
SPD PID Defaults - P: 2.00
PRV PID Defaults - P: 2.00
HGV PID Defaults - P: 2.00
This box displays parameters pertinent to the
Evaporator Pressure Controller used to maintain the
refrigerant pressure in the evaporator (PV) at the
setpoint (SP) during off design operation. The output
(CV) displayed will decrease to unload the chiller
if the evaporator refrigerant pressure falls below the
setpoint. The black text to the right of the data fields
changes to SPD, PRV, or HgV depending on the
mode selected with the Select Control key The green
Inactive text changes to yellow Active text to display
if the controller is presently controlling the chiller
capacity.
Condenser pressure
Screen: Capacity Controls
SP (PSP2) Range: 130.0-180.0
PID Tuning Ranges - P: 0.00-5.00
SPD PID Defaults - P: 1.00
PRV PID Defaults - P: 2.00
HGV PID Defaults - P: 2.00
This box displays parameters pertinent to the
Condenser Pressure Controller used to maintain
the refrigerant pressure in the condenser (PV) at the
setpoint (SP) during off design operation. The output
(CV) displayed will decrease to unload the chiller if
the condenser refrigerant pressure increases above the
setpoint. In some cases, different tuning parameters
must be entered to match the process response time
depending on the controlled device. The black text
to the right of the data fields changes to SPD, PRV,
or HgV depending on the mode selected with the
Select Control key. The green Inactive text changes
to yellow Active text to display if the controller is
presently controlling the chiller capacity.
JOHNSON CONTROLS
SP (PSP1) Default: 30.0 PSIG
I: 0.00-5.00 D: 0.00-5.00
I: 0.95 D: 0.00
I: 2.00 D: 0.00
I: 2.00 D: 0.00
SP (PSP2) Default: 145.0 PSIG
I: 0.00-5.00 D: 0.00-5.00
I: 0.95 D: 0.00
I: 2.00 D: 0.00
I: 2.00 D: 0.00
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
hotwell level
Screen: Condensate
SP (HLSP1) Range:
30.0-70.0%
PID Tuning Ranges - P: 0.00-5.00 I: 0.00-5.00
PID Tuning Defaults - P: 2.79
This box displays parameters pertinent to the Hotwell
Level Controller used to maintain the condensate level
(PV) in the steam condenser within the proportional
band of 40-60%. With the default tuning parameters
shown above, the output (CV) will be 50% at the
setpoint and will decrease from 50-0% as the level
(PV) increases from 50-60% to open the Overboard
Valve and close the Recirculation Valve. The green
text Auto changes to yellow Manual text to show the
status of the controller output as presently selected on
the Auto/Manual Screen.
Subcooler level
Screen: Condensate
SP (LSP) Range: 20.0 - 80.0%
RR (RRSP10) Range:
0.1-4.0 %/Sec
PID Tuning Ranges - P: 0.00-5.00 I: 0.00-5.00
Z1 PID Tuning Defaults - P: 0.10
Z2 PID Tuning Defaults - P: 0.10
This box displays parameters pertinent to the Subcooler
Level Controller used to maintain the refrigerant
liquid level (PV) in the subcooler at the setpoint (SP).
The output (CV) displayed will increase to open the
Subcooler Level Control Valve if the level increases
above the setpoint. On startup, after the TDSP6-Time
Delay/Subcooler Level Pulldown has elapsed, the
level setpoint is set from 0% to the present level and
then ramped up to the programmed setpoint at the
programmed setpoint ramp rate (RR) displayed. The
output (CV) will begin to decrease from 100% to close
the valve and begin backing liquid up in the subcooler
until the setpoint is achieved. The output (CV) will
never be allowed to decrease below the LCVM-
Subcooler Level Valve Minimum Position shown on
Capacity Control Setpoints Screen 1. The green Auto
text changes to yellow Manual text to show the status
of the controller output as presently selected on the
Auto/Manual Screen. The black text to the right of the
data fields changes to Z1 or Z2 depending on the zone
selected with the Select Zone key.
SP (HLSP1) Default:
50.0%
D: 0.00-5.00 O: 40.0-60.0%
I: 1.25 D: 0.00 O: 50.0%
SP (LSP1) Default: 50.0%
RR (RRSP10) Default:
0.1%/Sec
D: 0.00-5.00
I: 2.50 D: 0.00
I: 2.50 D: 0.00
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