Carrier 23 XL installation instructions Copyright 1994 Carrier Corporation

IMPORTANT: Wiring shown is typical and not intended to show detail			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 a speci®c installation. Refer to certi®ed ®eld wiring diagrams for				for Carrier to start pumps and tower fan motors must be provided to assure machine
additional information. Certi®ed drawings are available upon request.				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-
	LEGEND			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
	Required Power Wiring	Options Wiring
				carrying 50 v or higher or along side wires carrying 50 v or higher.
	Required Control Wiring
			3.5	Voltage selector switch in machine power panel is factory set for 115 v control power
NOTES:
				source. When 230 v control power source is used, set switch to 230 v
I. GENERAL				position.
1.0	Starters shall be designed and manufactured in accordance with Carrier Engineer-		3.6	Control wiring cables between starter and power panel must be shielded with mini-
	ing Requirement Z-375.			mum rating of 600 v, 80 C. Ground shield at starter.
1.1	All ®eld-supplied conductors, devices, ®eld-installation wiring, and termination of		3.7	Voltage to terminals LL1 and LL2 comes from a control transformer in a starter built
	conductors and devices, must be in compliance with all applicable codes and job			to Carrier speci®cations. Do not connect an outside source of control power to the
	speci®cations.			compressor motor starter (terminals LL1 and LL2). An outside power source will
1.2	The routing of ®eld-installed conduit and conductors and the location of ®eld-			produce dangerous voltage at the line side of the starter, because supplying voltage
	installed devices, must not interfere with equipment access or the reading, adjust-			at the transformer secondary terminals produces input level voltage at the trans-
	ing, or servicing of any component.			former primary terminals.
1.3	Equipment, installation, and all starting and control devices must comply with de-		IV. POWER WIRING BETWEEN STARTER AND COMPRESSOR MOTOR
	tails in equipment submittal drawings and literature.		4.0	Low voltage (600 v or less) compressor motors have (6) 1¤2 in. terminal studs (lead
1.4 Contacts and switches are shown in the position they would assume with the circuit				connectors not supplied by Carrier). Either 3 or 6 leads must be run between com-
	deenergized and the chiller shut down.			pressor motor and starter, depending on type of motor starter employed. If only 3
1.5	WARNING Ð Do not use aluminum conductors.			leads are required, jumper motor terminals as follows: 1 to 6, 2 to 4, 3 to 5. Center
1.6	Installer is responsible for any damage caused by improper wiring between starter			to center distance between terminals is 2.73 inches. Compressor motor starter must
				have nameplate stamped as to conforming with Carrier requirement ``Z-375.''
	and machine.
			4.1	When more than one conduit is used to run conductors from starter to compressor
II. POWER WIRING TO STARTER
				motor terminal box, one conductor from each phase must be in each conduit, to
2.0	Power conductor rating must meet minimum unit nameplate voltage and compres-			prevent excessive heating. (e.g., conductors to motor terminals 1, 2 and 3 in one
	sor motor RLA (rated load amps).			conduit, and these to 4, 5 and 6 in another.)
	When (3) conductors are used:		4.2	Compressor motor power connections can be made through top, bottom, or right
	Minimum ampacity per conductor = 1.25 x compressor RLA			side of compressor motor terminal box by rotating the terminal box and using holes
	When (6) conductors are used:			cut by contractor to suit conduit. Flexible conduit should be used for the last few feet
	Minimum ampacity per conductor = 0.721 x compressor RLA			to the terminal box for unit vibration isolation. Use of stress cones or 12 conductors
2.1	Lug adapters may be required if installation conditions dictate that conductors be			larger than 500 MCM may require an oversize (special) motor terminal box (not
				supplied by Carrier). Lead connections between 3-phase motors and their
	sized beyond the minimum ampacity required. Contact starter supplier for lug
				starters must not be insulated until Carrier personnel have checked compressor
	information.
				rotation.
2.2 Compressor motor and controls must be grounded by using equipment grounding
			4.3	Compressor motor frame to be grounded in accordance with the National Electrical
	lugs provided inside starter enclosure.
				Code (NFPA-70) and applicable codes. Means for grounding compressor motor is
III. CONTROL WIRING				(2) Thomas and Betts pressure connectors for 350 to 800 MCM wire, supplied and
3.0	Field supplied control conductors to be at least 18 AWG (American Wire Gage) or			located in the back upper and lower right side corners of the compressor motor
				terminal box.
	larger.
			4.4	Do not allow motor terminals to support weight of wire cables. Use cable supports
3.1	Chilled water and condenser water ¯ow switch contacts, optional remote start
				and strain reliefs as required.
	device contacts and optional spare safety device contacts, must have 24 vdc rating.
			4.5	Use back up wrench when tightening lead connectors to motor terminal studs. Torque
	Max current is 60 ma, nominal current is 10 ma. Switches with gold plated
	biurcated contacts are recommended.			to 10-15 lb-ft maximum.

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

→Fig. 35 Ð 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, speci®cations or designs without notice and without incurring obligations.

Book	2	PC 211	Catalog No. 532-303	Printed in U.S.A.	Form 23XL-2SI	Pg 34	796	9-94	Replaces: 23XL-1SI
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