Carrier AquaEdge 19XR series Installation Instructions Manual page 72

I. GENERAL
1.0 Variable frequency drive (VFD) shall be designed and man-
ufactured in accordance with Carrier Engineering Require-
ment Z-416.
1.1 All field-supplied conductors, devices, and the field-
installation wiring, termination of conductors and devices,
must be in compliance with all applicable codes and job
specifications.
To prevent damage to machine, do NOT punch holes or drill into
the top surface of the VFD enclosure for field wiring. Knockouts
are provided on the side of the VFD enclosure for field wiring
connections.
1.2 The routing of field-installed conduit and conductors and
the location of field-installed devices must not interfere with
equipment access or the reading, adjusting, or servicing of
any component.
1.3 Equipment installation and all starting and control devices,
must comply with details in equipment submittal drawings
and literature.
1.4 Contacts and switches are shown in the position they would
assume with the circuit de-energized and the chiller shut
down.
1.5 WARNING — Do not use aluminum conductors.
1.6 Installer is responsible for any damage caused by improper
wiring between VFD and machine.
1.7 All field-installed wiring is field-supplied.
II. POWER WIRING TO VFD
2.0 Provide a local means of disconnecting power to VFD.
2.1 Lug adapters may be required if installation conditions dic-
tate that conductors be sized beyond the minimum ampac-
ity required. Refer to VFD dimensional drawings for lug
information.
2.2 Compressor motor and controls must be grounded by using
equipment grounding lugs provided inside VFD enclosure.
III. CONTROL WIRING
3.0 Field-supplied control conductors to be at least 18 AWG or
larger.
3.1 Optional ice build start/terminate device contacts, optional
remote start/stop device contacts and optional spare safety
device contacts, must have 24 VAC rating. MAX current is
60 mA, nominal current is 10 mA. Switches with gold plated
bifurcated contacts are recommended.
3.2 Remove jumper wire between J2-1 and J2-2 before con-
necting auxiliary safeties between these terminals.
3.3 Each integrated contact output can control loads (VA) for
evaporator pump, condenser pump, tower fan low, tower fan
high, and alarm annunciator devices rated 5 amps at 115
VAC and up to 3 amps at 277 VAC.
Control wiring for Carrier to start pumps and tower fan motors
and establish flows must be provided to assure machine protec-
tion. If primary pump, tower fan, and flow control is by other
means, also provide parallel means for control by Carrier. Fail-
ure to do so could result in machine freeze-up or overpressure.
Do not use control transformers in the control center as the
power source for external or field-supplied contactor coils,
actuator motors or any other loads.
3.4 Do not route control wiring carrying 30 v or less within a
conduit which has wires carrying 50 v or higher or along
side wires carrying 50 v or higher.
NOTES FOR FIG. 36
19XR with Free-Standing Low Voltage VFD
CAUTION
CAUTION
3.5 Control wiring between VFD and power panel must be sep-
arate shielded cables with minimum rating 600 v, 80 C.
Ground shield at VFD.
3.6 If optional pumpout/oil pump circuit breaker is not supplied
within the starter enclosure, it must be located within sight of
machine with wiring routed to suit.
3.7 When providing conductors for oil pump motor and oil
heater power, refer to sizing data on label located on the
chiller power panel, equipment submittal documentation or
equipment product data catalog.
3.8 Spare 4-20 mA output signal is designed for controllers with a
non-grounded 4-20 mA input signal and a maximum input
impedance of 500 ohms.
IV. POWER WIRING BETWEEN FREE-STANDING VFD AND
COMPRESSOR MOTOR
4.0 Low voltage (600 v or less) compressor motors have (6)
5
/ in. terminal studs with 19XR frame 2 and 3 compressor
8
or (6) 7 / -in. terminal studs with 19XR frame 4 and 5 com-
8
pressor (lead connectors not supplied by Carrier). Either 3
or 6 leads must be run between compressor motor and
VFD, depending on the size of the conductors or the type of
motor starter employed. If only 3 leads are utilized, jumper
motor terminals as follows: 1 to 6, 2 to 4, 3 to 5. Center to
center distance between frame 2 and 3 compressor termi-
5
nals is 3- / inches. Center to center distance between
32
frame 4 and 5 compressor terminals is 4-
pressor motor VFD must have nameplate stamped as to
conforming with Carrier Engineering requirement "Z-416."
4.1 Power conductor rating must meet minimum unit nameplate
voltage and compressor motor RLA. Refer to the label
located on the side of the chiller control panel, equipment
submittal documentation or equipment product data catalog
for conductor sizing data. (Conductor as defined below may
be a single lead or multiple smaller ampacity leads in paral-
lel for the purpose of carrying the equivalent or higher cur-
rent of a single larger lead.)
When (3) conductors are used:
Minimum ampacity per conductor = 1.25 x compressor RLA
When (6) conductors are used:
Minimum ampacity per conductor = 1.25 x compressor
RLA / 2.
4.2 When more than one conduit is used to run conductors
from VFD to compressor motor terminal box, an equal num-
ber of leads from each phase (conductor) must be in each
conduit to prevent excessive heating. (For example, con-
ductors to motor terminals 1, 2, and 3 in one conduit, and
conductors to motor terminals 4, 5, and 6 in another).
4.3 Compressor motor power conductors may enter terminal
box through top, left side or bottom left using holes cut by
contractor to suit conduit. Flexible conduit should be used
for the last few feet to the terminal box for unit vibration iso-
lation. Use of stress cones or 12 conductors larger
than 500 MCM may require an oversize (special) motor ter-
minal box (not supplied by Carrier). Lead connections
between 3-phase motors and VFD must not be insulated
until Carrier personnel have checked compressor and oil
pump rotations.
4.4 Compressor motor frame to be grounded in accordance
with the National Electrical Code (NFPA-70) and applicable
codes. Means for grounding compressor motor is a pres-
sure connector for #4 AWG to wire, supplied and located in
the lower left side corner of the compressor motor terminal
box.
4.5 Do not allow motor terminals to support weight of wire
cables. Use cable supports and strain reliefs as required.
4.6 Use backup wrench when tightening lead connectors to
motor terminal studs. Torque to 45 lb-ft max.
4.7 Do not exceed 100 ft. maximum power cable length
between the VFD and motor terminals without consulting
Carrier for special requirements.
72
13
/ inches. Com-
16