Carrier 23XL Installation Instructions Manual page 34

IMPORTANT: Wiring shown is typical and not intended to show detail
for a specific installation. Refer to certified field wiring diagrams for
additional information. Certified drawings are available upon request.
LEGEND
Required Power Wiring
Required Control Wiring
NOTES:
I. GENERAL
1.0 Starters shall be designed and manufactured in accordance with Carrier Engineer-
ing Requirement Z-375.
1.1 All field-supplied conductors, devices, field-installation wiring, and termination of
conductors and devices, must be in compliance with all applicable codes and job
specifications.
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, adjust-
ing, or servicing of any component.
1.3 Equipment, installation, and all starting and control devices must comply with de-
tails in equipment submittal drawings and literature.
1.4 Contacts and switches are shown in the position they would assume with the circuit
deenergized 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.
II. POWER WIRING TO STARTER
2.0 Power conductor rating must meet minimum unit nameplate voltage and compres-
sor motor RLA (rated load amps).
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
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
lugs provided inside starter enclosure.
III. CONTROL WIRING
3.0 Field supplied control conductors to be at least 18 AWG (American Wire Gage) or
larger.
3.1 Chilled water and condenser water flow switch contacts, optional remote start
device contacts and optional spare safety device contacts, must have 24 vdc rating.
Max current is 60 ma, nominal current is 10 ma. Switches with gold plated
biurcated contacts are recommended.
3.2 Remove jumper wire between 12A and 12B before connecting auxiliary safeties be-
tween these terminals.
Fig. 35 — 23XL Typical Field Wiring with Free-Standing Starter (Frame 1 and 2 Machines Shown)
Copyright 1994 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 2 PC 211 Catalog No. 532-303
Tab 5e
Options Wiring
Printed in U.S.A. Form 23XL-2SI
3.3 Pilot relays can control cooler and condenser pump and tower fan motor contactor
coil loads rated 10 amps at 115 vac up to 3 amps at 600 vac. Control wiring required
for Carrier to start pumps and tower fan motors must be provided to assure machine
protection. If primary pump and tower fan motor control is by other means, also
provide a parallel means for control by Carrier. Do not use starter control trans-
former as the power source for pilot relay 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 Voltage selector switch in machine power panel is factory set for 115 v control power
source. When 230 v control power source is used, set switch to 230 v
position.
3.6 Control wiring cables between starter and power panel must be shielded with mini-
mum rating of 600 v, 80 C. Ground shield at starter.
3.7 Voltage to terminals LL1 and LL2 comes from a control transformer in a starter built
to Carrier specifications. Do not connect an outside source of control power to the
compressor motor starter (terminals LL1 and LL2). An outside power source will
produce dangerous voltage at the line side of the starter, because supplying voltage
at the transformer secondary terminals produces input level voltage at the trans-
former primary terminals.
IV. POWER WIRING BETWEEN STARTER AND COMPRESSOR MOTOR
4.0 Low voltage (600 v or less) compressor motors have (6)
connectors not supplied by Carrier). Either 3 or 6 leads must be run between com-
pressor motor and starter, depending on type of motor starter employed. If only 3
leads are required, jumper motor terminals as follows: 1 to 6, 2 to 4, 3 to 5. Center
to center distance between terminals is 2.73 inches. Compressor motor starter must
have nameplate stamped as to conforming with Carrier requirement ''Z-375.''
4.1 When more than one conduit is used to run conductors from starter to compressor
motor terminal box, one conductor from each phase must be in each conduit, to
prevent excessive heating. (e.g., conductors to motor terminals 1, 2 and 3 in one
conduit, and these to 4, 5 and 6 in another.)
4.2 Compressor motor power connections can be made through top, bottom, or right
side of compressor motor terminal box by rotating the terminal box and 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 isolation. 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
rotation.
4.3 Compressor motor frame to be grounded in accordance with the National Electrical
Code (NFPA-70) and applicable codes. Means for grounding compressor motor is
(2) Thomas and Betts pressure connectors for 350 to 800 MCM wire, supplied and
located in the back upper and lower right side corners of the compressor motor
terminal box.
4.4 Do not allow motor terminals to support weight of wire cables. Use cable supports
and strain reliefs as required.
4.5 Use back up wrench when tightening lead connectors to motor terminal studs. Torque
to 10-15 lb-ft maximum.
Pg 34 796
⁄ in. terminal studs (lead
1
2
9-94 Replaces: 23XL-1SI