Carrier 17, 19EX installation instructions Indicates remote alarm contacts

*Indicates chilled water pump control contacts or run status contacts. ²Indicates condenser water pump control contacts.

**Indicates tower fan relay contacts. ²²Indicates circuit breaker shunt trip contacts.

Indicates remote alarm contacts.

NOTES:

I.GENERAL

1.0Starters shall be designed and manufactured in accordance with Carrier Engineer- ing Requirement Z-375.

1.1All ®eld-supplied conductors, devices, ®eld-installation wiring, and termination of con- ductors and devices, must be in compliance with all applicable codes and job speci- ®cations.

1.2The routing of ®eld-installed conduit and conductors and the location of ®eld- installed devices must not interfere with equipment access or the reading, adjusting, or servicing of any component.

1.3Equipment, installation, and all starting and control devices must comply with de- tails in equipment submittal drawings and literature.

1.4Contacts and switches are shown in the position they would assume with the circuit deenergized and the chiller shut down.

1.5WARNING Ð Do not use aluminum conductors.

1.6Installer is responsible for any damage caused by improper wiring between starter and machine.

II.POWER WIRING TO STARTER

2.0Power 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

2.1Lug adapters may be required if installation conditions dictate that conductors be sized beyond the minimum ampacity required. Contact starter supplier for lug information.

2.2Compressor motor and controls must be grounded by using equipment grounding lugs provided inside starter enclosure.

III.CONTROL WIRING

3.0Field supplied control conductors to be at least 18 AWG or larger.

3.1Chilled water and condenser water ¯ow 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.

3.2Remove jumper wire between 12A and 12B before connecting auxiliary safeties be- tween these terminals.

3.3Pilot 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.

LEGEND

Required Power Wiring

Required Control Wiring

Options Wiring

SMM Ð Starter Management Module

3.4Do 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.

3.5Voltage 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.

3.6Control 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.

3.7If 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.

3.8Voltage to terminals LL1 and LL2 comes from a control transformer in a starter built to Carrier speci®cations. 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

4.0Low 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 215¤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 79¤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.

4.1When 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.)

4.2Compressor 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.

4.3Compressor 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.

4.4Do not allow motor terminals to support weight of wire cables. Use cable supports and strain reliefs as required.

4.5Use backup wrench when tightening lead connectors to motor terminal studs. Torque to 45 lb-ft max.

Fig. 17 Ð Typical Field Wiring (Low-Voltage Motors) with Free-Standing Starter

23