Johnson Controls York YKEP Series User Manual

FORM 160.77-O2
ISSUE DATE: 11/15/2011
SECTION 3 - YKEP CONTROL PANEL OPERATION
JOHNSON CONTROLS
73
3
SPEED ANTI-SURGE MAP
The speed anti-surge map defines the minimum speed
permitted for surge-free compressor operation as a
function of differential pressure between the con-
denser and evaporator when a variable speed drive is
employed. The map defines a four-segment curve in
terms of speed on the horizontal axis and shell pres-
sure differential on the vertical axis. Primary compres-
sor operation is only permitted to the right side of this
line by restricting drive speed to no less than the speed
defined by this line for each existing pressure differen-
tial condition prevailing. The curve is defined by the
following points:
SPD1
Condenser - Evaporator pressure at the highest design
condition.
SPD2
Condenser - Evaporator pressure at a second, lower
head condition.
SPD3
Condenser - Evaporator pressure at a second, lower
head condition .
SPD4
Condenser - Evaporator pressure at a second, lower
head condition.
SPD5
Condenser - Evaporator pressure at a second, lower
head condition.
MSP1
Minimum speed to avoid surge at the pressure differen-
tial defined by SPD1.
MSP2
Minimum speed to avoid surge at the pressure differen-
tial defined by SPD2.
MSP3
Minimum speed to avoid surge at the pressure differen-
tial defined by SPD3.
MSP4
Minimum speed to avoid surge at the pressure differen-
tial defined by SPD4.
MSP5
Minimum speed to avoid surge at the pressure differen-
tial defined by SPD5.
Min Speed Calc
displays the minimum speed determined by the map
for the current differential pressure condition. When a
surge is detected, the speed and differential pressure at
the time of the event are plotted on the map to adjust
the line.
Max Head
displays the highest design pressure differential above
which the mapped line is not extrapolated, but retains
the limit determined at this end point.
Min Head
displays the lowest design pressure differential below
which the mapped line is not extrapolated, but retains
the limit determined at this end point.
Bias
displays a programmable offset to the speed anti-surge
map in terms of constant offset to the existing line.
Reset Surge Events
This key clears the speed map and resets all of the point
settings to zero. This should not be done unless all of
the existing line is intended to be eliminated.

Johnson Controls York YKEP Series Specifications

General

Brand	Johnson Controls
Model	York YKEP Series
Category	Chiller
Language	English