Initial Start-Up - Carrier 19XR Start-Up, Operation And Maintenance Instructions Manual

Always operate the condenser and chilled water pumps
whenever charging, transferring, or removing refrig-
rant from the chiller.
Use the CONTROL TEST terminate lockout function to
monitor conditions and start the pumps.
If the chiller has been shipped with a holding charge, the
refrigerant is added through the refrigerant charging valve
(Fig. 26 and 27, valve 7) or to the pumpout charging con-
nection. First evacuate the nitrogen holding charge from the
chiller vessels. Charge the refrigerant as a gas until the sys-
tem pressure exceeds 35 psig (141 kPa) for HFC-134a. After
the chiller is beyond this pressure the refrigerant should be
charged as a liquid until all the recommended refrigerant charge
has been added.
TRIMMING REFRIGERANT CHARGE — The 19XR is
shipped with the correct charge for the design duty of the
chiller. Trimming the charge can best be accomplished when
the design load is available. To trim the charge, check the
temperature difference between the leaving chilled water tem-
perature and cooler refrigerant temperature at full load
design conditions. If necessary, add or remove refrigerant to
bring the temperature difference to design conditions or mini-
mum differential.
Table 7 lists the 19XR chiller refrigerant charges for each
cooler and condenser code. 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 re-
frigerant temperature 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.
Do not permit water or brine that is warmer than
110 F (43 C) to flow through the cooler or con-
denser. Refrigerant overpressure may discharge through
the relief valves and result in the loss of refrigerant
charge.
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 restart 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
1. Disengage the main motor disconnect on the starter front
panel. This should only disconnect the motor power. Power
to the controls, oil pump, and starter control circuit should
still be energized.
2. Observe the default screen on the CVC: the Status mes-
sage in the upper left-hand corner reads, ''Manually
Stopped.'' Press the CCN or LOCAL softkey to start.
If the chiller controls do not go into a start mode, go to
the Schedule screen and override the schedule or change
the occupied time. Press the LOCAL softkey to begin
the start-up sequences.
3. 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 and goes through its start-up
sequence.
5. Check the main contactor for proper operation.
6. The PIC II eventually shows an alarm for motor amps
not sensed. Reset this alarm and continue with the initial
start-up.
Check Motor Rotation
1. Engage the main motor disconnect on the front of the starter
panel. The motor is now ready for a rotation check.
2. After the default screen status message states ''Ready
for Start'' press the LOCAL softkey. The PIC II control
performs start-up checks.
3. When the starter is energized and the motor begins to turn,
check for clockwise motor rotation (Fig. 29).
IF THE MOTOR ROTATION IS CLOCKWISE, allow the
compressor to come up to speed.
IF THE MOTOR ROTATION IS NOT CLOCKWISE
(as viewed through the sight glass), reverse any 2 of the 3
incoming power leads to the starter and recheck the rotation.
NOTE: Solid-state starters have phase protection and do not
permit a start if the phase is not correct. If this happens, a
fault message appears on the CVC.
Do not check motor rotation during coastdown. Rota-
tion may have reversed during equalization of vessel
pressures.
Fig. 29 — Correct Motor Rotation
58