81
If ACTUAL GUIDE VANE POSITION is less than 30%,
go to Step 1. If ACTUAL GUIDE VANE POSITION is greater
than 60%, then go to Step 3.
1. Do not change SURGE LINE SHAPE FACTOR from
the value selected by Chiller Builder (ECAT). Decrease
SURGE/HGBP DELTA TSMIN in 1° F steps up to 5
times. Monitor chiller for surge.
2. If ACTUAL GUIDE VANE POSITION is still less than
30 and step 1 failed, then increase the value of SURGE
LINE SHAPE FACTOR in steps of 0.01 up to 2 times.
For example, if surge is encountered when shape factor is
–0.06, increase the SURGE LINE SHAPE FACTOR to
–0.05. If this does not solve the problem, go to step 5,
even if ACTUAL GUIDE VANE POSITION is less than
30%.
3. Do not change SURGE LINE SHAPE FACTOR from
the value selected by Chiller Builder (ECAT). Decrease
SURGE/HGBP DELTA TSMAX by 1° F Steps up to 5
times. Monitor chiller for surge.
4. If ACTUAL GUIDE VANE POSITION is greater than
60% and Step 4 failed to eliminate surge, then set
SURGE/HGBP DELTA TSMAX to 5° F below the value
specified by Chiller Builder (ECAT). Increase the value
of the SURGE LINE SHAPE FACTOR in steps of 0.01
up to 2 times. For example, if surge is encountered when
the SURGE LINE SHAPE FACTOR is –0.06, increase
the SURGE LINE SHAPE FACTOR to –0.05. If this
does not solve the problem, go to Step 5, even if ACTU-
AL GUIDE VANE POSITION is greater than 60%.
5. If ACTUAL GUIDE VANE POSITION is greater than
30% but less than 60% or if Step 2 failed (with ACTUAL
GUIDE VANE POSITION less than 30) or if Step 4
failed (with ACTUAL GUIDE VANE POSITION great-
er than 60), then perform this step. Do not change
SURGE LINE SHAPE FACTOR from the value speci-
fied by Chiller Builder (ECAT). Reset SURGE/HGBP
DELTA TSMIN and SURGE/HGBP DELTA TSMAX to
the value specified by Chiller Builder (ECAT). Decrease
SURGE/HGBP DELTA TSMIN and SURGE/HGBP
DELTA TSMAX in steps of 1° F up to 5 times. Monitor
chiller for surge.
CONFIGURE DIFFUSER CONTROL IF NECES-
SARY — If the compressor is equipped with a variable
diffuser, (size 4 or 5 compressor) access the VDO_SRD
screen. Scroll to
DIFFUSER CONTROL
and press the
softkey. Compare the diffuser and guide vane
values (
GUIDE VANE 25% LOAD PT, GUIDE VANE 50%
LOAD PT, GUIDE VANE 75% LOAD PT, DIFFUSER 25%
LOAD POINT, DIFFUSER 50% LOAD POINT, DIFFUSER
75% LOAD POINT
) to the values located on the label inside
the control panel above the ICVC. See Fig. 13.
Compressors with variable diffuser control have actuators
tested and stamped with the milliamp (mA) value that results in
100% actuator rotation. In addition to the diffuser position
schedule, the DIFFUSER FULL SPAN mA of the split ring
diffuser actuator must be entered in the SETUP2 screen. This
information is printed on a label affixed under the solid-state
controller box on the right side of the split ring diffuser actuator
when viewing the compressor from the suction end.
Units with VFD — On units with VFD further adjustments can
be made if response to surge prevention or protection is not
functioning as desired.
VFD GAIN
and
VFD INCREASE STEP
can be adjusted to allow for more aggressive changes in speed
when surge prevention or protection is active.
MODIFY EQUIPMENT CONFIGURATION IF NECES-
SARY — The EQUIPMENT SERVICE table has screens to
select, view, or modify parameters. Carrier’s certified drawings
have the configuration values required for the jobsite. Modify
these values only if requested.
EQUIPMENT SERVICE Screen Modifications — Change
the values on these screens according to specific job data. See
the certified drawings for the correct values. Modifications can
include:
• Chilled water reset
• Entering chilled water control (Enable/Disable)
• 4 to 20 mA demand limit
• Auto restart option (Enable/Disable)
• Remote contact option (Enable/Disable)
See PIC II System Functions (page 43) for description of
these functions.
Owner-Modified CCN Tables — The following EQUIP-
MENT CONFIGURATION screens are described for refer-
ence only.
OCCDEFCS —
The OCCDEFCS screen contains the Local
and CCN time schedules, which can be modified here or on the
SCHEDULE screen as described previously.
HOLIDAYS —
From the HOLIDAYS screen, the days of the
year that holidays are in effect can be configured. See the holi-
day paragraphs in the Controls section for more details.
BRODEF —
The BRODEF screen defines the start and end of
daylight savings time. By default this feature is enabled. Enter
the dates for the start and end of daylight savings if required
for your location. Note that for Day of Week, 1 represents
Monday. Start Week and Stop Week refer to the instance of the
selected Day of Week during the selected month and year. To
disable the feature, change START ADVANCE and STOP
BACK times to 0 (minutes). In the BRODEF table the user
may also identify a chiller as the time broadcaster for a CCN
network. There should be only one device on a CCN network
which is designated as the Time Broadcaster.
ALARM ROUTING —
This is in the table SERVICE
–>
EQUIPMENT CONFIGURATION
–>
NET_OPT under the
heading Alarm Configuration. ALARM ROUTING consists
of an 8-bit binary number. Only bits 1, 2, and 4 (counting
from the left, first) are used. The others do not matter. The bits
can be set by any device which can access and change configu-
ration tables. If any of these 3 bits is set to 1, the controller
(ICVC, for example) will broadcast any alarms which occur.
• first bit = 1 indicates that the alarm should be read and pro-
cessed by a “front end” device, such as a Comfort-
WORKS
®
device.
• second bit = 1 indicates that the alarm should be read and
processed by a TeLINK™ or Autodial Gateway module.
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
0
10
20
30
40
50
60
70
80
90
100
110
Speed Factor
=1.60
Speed Factor
=1.85
Speed Factor
=2.00
GV_POS
Delta T
sat
Fig. 40 — Effect of SURGE LINE SPEED FACTOR
on Surge Prevention
a19-1962
ENABLE
Summary of Contents for AquaEdge 19XR series
Page 69: ...69 Fig 33 19XR Leak Test Procedures a19 1625 ...
Page 154: ...154 Fig 64 Benshaw Inc Wye Delta Unit Mounted Starter Wiring Schematic Low Voltage a19 1873 ...
Page 161: ...161 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v ...
Page 162: ...162 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v cont ...
Page 186: ...186 APPENDIX B LEAD LAG WIRING 19XR Lead Lag Schematic Series Cooler Flow a19 1655 ...
Page 187: ...187 APPENDIX B LEAD LAG WIRING cont 19XR Lead Lag Schematic Parallel Cooler Flow a19 1717 ...