Starting Equipment; Unit-Mounted Vfds; Parts Identification And Location - Carrier AquaEdge 19XR Series Start-Up, Operation And Maintenance Instructions Manual

STARTING EQUIPMENT

The 19XR chiller requires a motor starter or VFD to operate the
centrifugal hermetic compressor motor. The starter or VFD have
communication wiring between itself and Carrier power panel
(19XR2-E) or Carrier control panel (19XR6-7).
See Carrier's specifications for specific starter/VFD requirements.
All starters/VFDs must meet these specifications in order to prop-
erly start and satisfy mechanical safety requirements.
There may be multiple circuit breakers inside the starter. These in-
clude the main compressor motor circuit breaker, a circuit breaker
which provides power to the chiller control panel, and a possible
circuit breaker for starter specific controls. The control breaker(s)
are typically wired in parallel with the first so that power is provid-
ed to those services when the main breaker is open. The discon-
nect switch on the starter front cover is connected to the main
breaker. For 19XR2-E units it is typical that the starter provides
control power and if specified 3-phase power to the oil pump (for
medium/high voltage there is an option for a transformer). For
19XR6-7 it is typical that 3-phase power is field supplied to the
Carrier control panel which powers oil-pump, heater and controls.
Consult specific wiring diagrams for details.
WARNING
The main circuit breaker on the front of the starter/VFD dis-
connects the main motor power only. Power may be still ener-
gized for other circuits. Always check wiring diagrams before
initiating any work on the chiller and follow applicable lock-
out/tag-out procedures. Failure to disconnect power will result
in personal injury.

Unit-Mounted VFDs

The 19XR2-E starter options include a variable frequency
drive motor controller mounted on the condenser. See Fig. 12
and 13. These unit-mounted VFDs are offered with low voltage
motors between 380 and 575 vac. It reduces the starting current
inrush by controlling the voltage and frequency to the com-
pressor motor. Once the motor has accelerated to minimum
speed, the PIC 6 modulates the compressor speed and guide
vane position to control chilled water temperature.
Operational parameters and fault codes are displayed relative
to the drive. Refer to specific drive literature along with trou-
bleshooting sections (consult VFD nameplate on inside of door
if uncertain of drive model). The display is also the interface
for entering specific chiller operational parameters. These pa-
rameters have been preprogrammed at the factory. An adhe-
sive-backed label on the inside of the drive has been provided
for verification of the specific job parameters. See Initial Start-
Up Checklist section for details.
NOTE: The factory offers a variety of unit-mounted VFDs.
LiquiFlo2 is an active front end drive while PowerFlex 755,
LCX 9000, and PowerFlex 700L are 6-pulse passive rectifier
drives. PF700L is offered in 575V. See Fig. 14, Table 1, and
Carrier Specification Z-420 and Z-417 respectively, along with
drive-specific literature for details.

Parts Identification and Location

See Fig. 15-18.
15