Carrier AquaEdge 19XR series Installation Instructions Manual page 59

I. GENERAL
1.0 Starters shall be designed and manufactured in accordance
with Carrier Engineering Requirement Z-415.
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 starter enclosure for field wiring. Knock-
outs are provided on the side of the starter 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 starter and machine.
1.7 All field-installed wiring is field-supplied.
II. POWER WIRING TO STARTER
2.0 Provide a means of disconnecting power to starter.
2.1 Lug adapters may be required if installation conditions
dictate that conductors be sized beyond the minimum
ampacity required. Contact starter supplier for lug
information.
2.2 Compressor motor and controls must be grounded by using
equipment grounding lug provided inside starter enclosure.
III. CONTROL WIRING
3.0 Field-supplied control conductors to be at least 18 AWG or
larger.
3.1 Ice build start/terminate device contacts, remote start/stop
device contacts and spare safety device contacts (devices
not supplied by Carrier), 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 Feed 24 VAC power to safety input terminals. Reference
MX3 electrical drawings.
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.
3.5 Control wiring between starter and power panel must be
separate shielded cables with minimum rating 600 v, 80 C.
Ground shield at starter.
NOTES FOR FIG. 33
19XR with Free-Standing Starter (Low Voltage)
CAUTION
CAUTION
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 STARTER
AND COMPRESSOR MOTOR
4.0 Low voltage (600 v or less) compressor motors have (6)
5 / in. terminal studs (lead connectors not supplied
8
by Carrier). Either 3 or 6 conductors must be run between
compressor motor and starter, 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 terminals
5
is 3- / in. Compressor motor starter must have nameplate
32
stamped as to conforming with Carrier Engineering require-
ment "Z-415."
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 = 0.721 x compressor
RLA
4.2 When more than one conduit is used to run conductors
from starter to compressor motor terminal box, an equal
number of leads from the following phases (conductor)
must be installed in each conduit to prevent excessive
heating.
Inside delta starters: 1, 3, or multiples of 3 conduits are
required. (For example: conductors to motor terminals 1, 2,
3, 4, 5 and 6 in a single conduit or conductors to motor
terminals 1 and 4 in one conduit, conductors to motor
terminals 2 and 5 in one conduit and conductors to motor
terminals 3 and 6 in one conduit.)
For all other starters: 1, 2, or multiples of 2 are required.
(For example: conductors to motor terminals 1, 2, and 3 in
one conduit, and conductors to motor terminals 4, 5, and 6
in one conduit).
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 terminal box
(not supplied by Carrier). Lead connections between 3-
phase motors and their starters 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 pressure
connector for #4 AWG to 500 MCM 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.
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