Carrier 23 XL installation instructions General

IMPORTANT: Refer to certi®ed drawings for addi- tional information. Certi®ed drawings are available upon request.

LEGEND

Required Power Wiring

Required Control Wiring

Options Wiring

NOTES:

I.GENERAL

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

1.1All ®eld-supplied conductors, devices, ®eld-installation wiring, and ter- mination of conductors 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 com- ply with details 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.

II.POWER WIRING TO STARTER

2.0Power conductor rating must meet minimum unit nameplate voltage and compressor 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

2.1Lug adapters may be required if installation conditions dictate that con- ductors be sized beyond the minimum ampacity required. Solid-state starters are provided with:

A.Two (2) 0-250 MCM lugs provided per phase for power conductor terminations when compressor motor RLA is 400 amps or less.

B.Three (3), 250-500 MCM lugs provided per phase for power con- ductor terminations when compressor motor RLA is more than 400 amps.

Wye-Delta starters are provided with:

A.Two (2) 250-500 MCM lugs provided per phase for power conduc- tor terminators when compressor motor RLA is 420 amps or less.

B.Two (2) #1-500 MCM lugs provided per phase for power conductor terminations when compressor motor RLA is more than 420 amps.

2.2Power conductors to starter must enter through top of enclosure. Flex- ible conduit should be used for the last few feet to the enclosure to provide unit vibration isolation.

2.3Compressor motor and controls must be grounded by using equip- ment grounding lugs provided inside starter enclosure.

2.4Wye-Delta starters require the assembly and the installation of a ``Top Hat'' (located inside enclosure) to provide the required wire bending space for incoming power leads.

III.CONTROL WIRING

3.0Field supplied control conductors to be at least 18 AWG (American Wire Gage) or larger.

3.1Chilled water and condenser water ¯ow switch contacts, optional re- mote 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 bifurcated contacts are recommended.

3.2Remove jumper wire between 12A and 12B before connecting auxil- iary safeties between these terminals.

3.3Pilot relays can control cooler and condenser pump and tower fan mo- tor 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 transformer as the power source for pilot relay loads.

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.

Fig. 34 Ð 23XL Typical Field Wiring with Optional Unit-Mounted Starter (Frame 1 and 2 Machines Shown)

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