
86
temperature difference to design conditions or minimum
differential.
The 19XR chiller refrigerant charges for each cooler and
condenser code are listed in the Heat Exchanger Data tables in
the Physical Data section of this book, pages 121 to 178. Total
refrigerant charge is the sum of the cooler and condenser
charge.
INITIAL START-UP
Preparation —
Before starting the chiller, verify:
1. Power is on to the main starter, oil pump relay, tower fan
starter, oil heater relay, and the chiller control panel.
2. Cooling tower water is at proper level and at-or-below
design entering temperature.
3. Chiller is charged with refrigerant and all refrigerant and
oil valves are in their proper operating positions.
4. Oil is at the proper level in the reservoir sight glasses.
5. Oil reservoir temperature is above 140 F (60 C) or above
CALC EVAP SAT TEMP plus 50
F (28
C).
6. Valves in the evaporator and condenser water circuits are
open.
NOTE: If the pumps are not automatic, ensure water is
circulating properly.
7. Access the CONTROL TEST screen. Scroll down on the
TERMINATE LOCKOUT
option. Press the SELECT (to
enable the chiller to start) and answer YES to reset unit to
operating mode. The chiller is locked out at the factory in
order to prevent accidental start-up.
Dry Run to Test Start-Up Sequence
For unit-mounted Rockwell VFDs.
1. Disengage the main motor disconnect on the VFD front
panel. This should only disconnect the motor power.
Power to the controls, oil pump, and starter control circuit
should still be energized. Open the VFD enclosure, move
the VFD Test/Run switch into the “TEST” position.
Close the VFD enclosure and engage the main VFD
disconnect.
2. Observe the default screen on the ICVC: the status mes-
sage in the upper left-hand corner reads, “Manually
Stopped,” Press the
or
softkey to start. If
the chiller controls do not go into a start mode (“Unoccu-
pied Mode” is displayed) go to the SCHEDULE screen
and override the schedule or change the occupied time.
Press the
softkey to begin the start-up
sequences.
3. View the STARTUP display screen and verify the chilled
water and condenser water pumps have energized.
4. Verify the oil pump has started and is pressurizing the
lubrication system. After the oil pump has run about
11 seconds, the starter energizes (
COMPRESSOR START
CONTACT
is closed) and goes through its start-up
sequence.
5. The PIC II eventually shows an alarm for motors amps
not sensed. Reset this alarm and continue with the initial
start-up.
6. Disengage the main VFD disconnect. Open the VFD en-
closure, move the VFD Test/Run switch into the “RUN”
position. Close the VFD enclosure and engage the main
VFD disconnect.
Check Motor Rotation
1. Disengage the main VFD disconnect. Open the VFD en-
closure and engage the control power circuit breaker.
2. Then engage the oil pump circuit breaker located in the
same section of the starter cabinet. Close the VFD enclo-
sure door.
3. Finally, close the main disconnect on the front of the VFD
enclosure.
4. The ISM mounted in the VFD enclosure checks for prop-
er phase rotation as soon as power is applied to the starter
and the PIC II controls power up.
5. An alarm message will appear on the ICVC if the phase
rotation is incorrect. If this occurs reverse any 2 of the 3
incoming power leads to the starter and reapply power.
The motor is now ready for a rotation check.
6. After the default screen status message states ‘Ready to
Start’ press the
softkey. The PIC II control per-
forms start-up checks.
7. When the starter is energized and the motor begins to
turn, check for clockwise motor rotation (Fig. 45).
Check Oil Pressure and Compressor Stop
1. When the motor is at full speed, note the differential oil
pressure reading on the ICVC default screen. It should be
between 18 and 40 psid (124 to 206 kPad).
2. Press the Stop button and listen for any unusual sounds
from the compressor as it coasts to a stop.
CAUTION
Do not permit water or brine that is warmer than 110 F
(43 C) to flow through the cooler or condenser. Refrigerant
overpressure may discharge through the relief valves and
result in the loss of refrigerant charge.
CCN
LOCAL
LOCAL
IMPORTANT: Do not check motor rotation during coast-
down. Rotation may have reversed during equalization of
vessel pressures.
LOCAL
Fig. 45 — Correct Motor Rotation
Содержание AquaEdge 19XR series
Страница 69: ...69 Fig 33 19XR Leak Test Procedures a19 1625 ...
Страница 150: ...150 Fig 62 PIC II Control Panel Wiring Schematic Frame 2 3 4 and E Compressors without Split Ring Diffuser a19 1870 ...
Страница 152: ...152 a19 1871 Fig 63 PIC II Control Panel Wiring Schematic Frame 4 and 5 Compressors with Split Ring Diffuser ...
Страница 154: ...154 Fig 64 Benshaw Inc Wye Delta Unit Mounted Starter Wiring Schematic Low Voltage a19 1873 ...
Страница 161: ...161 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v ...
Страница 162: ...162 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v cont ...
Страница 163: ...163 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v cont a19 1880 ...
Страница 176: ...176 CONTINUED ON NEXT PAGE Fig 71 Typical Medium Voltage Variable Frequency Drive VFD Wiring Schematic cont a19 2064 ...
Страница 186: ...186 APPENDIX B LEAD LAG WIRING 19XR Lead Lag Schematic Series Cooler Flow a19 1655 ...
Страница 187: ...187 APPENDIX B LEAD LAG WIRING cont 19XR Lead Lag Schematic Parallel Cooler Flow a19 1717 ...