Trimming Refrigerant Charge; Initial Start-Up; Preparation; Check Motor Rotation - Carrier AquaEdge 19XRV series Operation, Maintenance And Installation Manual

CAUTION
Ensure that the condenser and chilled water pumps are
operating whenever charging, transferring, or removing
refrigerant from the chiller. Failure to do so could result in
serious personal injury or equipment damage.
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 pumpout charging connection
(Fig. 35 and 36, valve 1b). First evacuate the nitrogen holding
charge from the chiller vessels. Charge the refrigerant as a gas
until the system pressure exceeds 35 psig (141 kPa) for
HFC-134a. After the chiller is beyond this pressure the refrig-
erant should be charged as a liquid until all the recommended
refrigerant charge has been added. The charging valve (Fig. 35
and 36, valve 1a or 1b) can be used to charge liquid to the cool-
er or condenser. Do not charge liquid through the liquid line
service valve.
TRIMMING REFRIGERANT CHARGE — The
unit is shipped with the correct charge for the design duty of the
chiller. On most 19XRV chillers the design LTD (Leaving
Temperature Difference) between the leaving chilled water
temperature and the cooler refrigerant temperature is so low
that the traditional method of trimming the charge to achieve a
minimum LTD is not practical. In the case where leaks have
been found and corrected and the LTD is greater than about 4 F
(2.2 C) above design, add refrigerant until the full load design
LTD is approached, and then charge for proper oil return at low
load. (A high cooler LTD can also be caused by dirty tubes,
water box division plate bypass, a partially closed liquid isola-
tion valve, or a sticking float valve.)
If low load oil loss is experienced, operate the chiller at low
load with the guide vanes nearly closed and observe the flow
through the sight glass in the oil skimmer line. Under low load
operation one should be able to see a flow of bubbly oil and
refrigerant in the sight glass. If there is no visible flow, add
refrigerant. If the sight glass shows a flow of nearly clear fluid,
remove refrigerant.
The preferred location at which refrigerant should be added
directly into the chiller is through the service valve at the top of
the condenser. If that valve is not accessible due to presence of
an attached pumpdown unit which does not have a storage
tank, add charge through the valve connected to the side of the
condenser drain float sump. Adding charge through the drain
valve at the base of the chiller (off the liquid line) is NOT
recommended.
The full refrigerant charge on the 19XRV chiller will vary
with chiller components and design conditions, as indicated on
the job data specifications. An approximate charge may be de-
termined by adding the condenser charge to the cooler charge.
See the Physical Data section.

INITIAL START-UP

IMPORTANT: The Reliance VFD warranty will be void if
the VFD is not started by a technician who has completed
Reliance LiquiFlo™ Tier 1 Training and whose name is reg-
istered with Reliance.
Before starting the chiller, verify:
Preparation —
1. Power is on to the VFD, oil pump relay, 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
refrigerant 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 condenser. Refrigerant
overpressure may discharge through the relief valves and
result in the loss of refrigerant charge, damaging the chiller.
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.
19XRV

Check Motor Rotation

1. Engage the control power circuit breaker (CB2) located
inside the left hand side of the VFD enclosure.
2. Finally close the main motor disconnect (CB1) on the
front of the VFD enclosure.
3. The VFD checks for proper phase rotation as soon as
power is applied to the VFD and the PIC III controls
power up. The controls do not permit a start if the phase
rotation is not correct.
4. 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 VFD and reapply power.
The motor is now ready for a rotation check.
5. After the default screen status message states 'Ready to
Start' press the
performs start-up checks.
6. When the VFD is energized and the motor begins to turn,
check for clockwise motor rotation. See Fig. 46.
Do not check motor rotation during coastdown. Rotation
may have reversed during equalization of vessel pressures.
a19-1326
Fig. 46 — Correct Motor Rotation
80
CAUTION
softkey. The PIC III control
LOCAL
CAUTION