Refrigerator User Manual

*Indicates chilled water pump control contacts or run status contacts.
†Indicates condenser water pump control contacts.
**Indicates tower fan relay contacts.
††Indicates circuit breaker shunt trip contacts.
\ Indicates remote alarm contacts.
LEGEND
Required Power Wiring
Required Control Wiring
Options Wiring
SMM — Starter Management Module
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 con-
ductors and devices, must be in compliance with all applicable codes and job speci-
fications.
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 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.
When (3) conductors are used:
Minimum ampacity per conductor = 1.25 x compressor RLA
When (6) conductors are used for Wye-Delta starting:
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 or larger.
3.1 Chilled water and condenser water flow switch contacts, optional remote start de-
vice 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 bifur-
cated contacts are recommended.
3.2 Remove jumper wire between 12A and 12B before connecting auxiliary safeties be-
tween these terminals.
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 are controlled by other
means, also provide a parallel means for control by Carrier. Do not use starter con-
trol transformer 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. Do not use the 230 v position. If this switch is set to 230 v position, the oil
heater will not operate.
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. Wires A,B, and C are commu-
nication wires and must be run in a separate cable.
3.7 If optional oil pump circuit breaker is not supplied within the starter enclosure as
shown, it must be located within sight of the machine with wiring routed to suit.
3.8 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),
5
⁄ 8 in. terminal studs (lead
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
15
⁄ 16 inches. Compressor motor starter must
have nameplate stamped as to conforming with Carrier requirement Z-375. Medium
voltage (over 600 v) compressor motors have (3) terminals. Connections out of ter-
minals are 3 in. long stranded wire pigtails, #4 AWG, strand wire for all medium
voltage motor sizes. Distance between terminal is 7
9
⁄ 16 inches. Use suitable splice
connectors and insulation for high voltage alternating current cable terminations (these
items are not supplied by Carrier). 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 those to 4, 5 and 6 in another.)
4.2 Compressor motor power connections can be made through top, top rear or sides
of compressor motor terminal box using holes cut by contractor to suit conduit. Flex-
ible 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 connec-
tions between 3-phase motors and their starters must not be insulated until Carrier
personnel have checked compressor and oil pump rotations.
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
a pressure connector for #4 to 500 MCM wire, supplied and located in the back
lower left side corner 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 backup wrench when tightening lead connectors to motor terminal studs. Torque
to 45 lb-ft max.
Fig. 17 — Typical Field Wiring (Low-Voltage Motors) with Free-Standing Starter
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