Carrier 19XR Fig. 29 19XR Typical Field Wiring with Free-Standing Starter

LEGEND

NOTES:

I. GENERAL

1.0 Starters shall be designed and manufactured in accordance with

Carrier Engineering Requirement Z-375.

1.1 All ﬁeld-supplied conductors, devices, ﬁeld-installation wiring, and ter-

minationof conductors and devices must be in compliance with all ap-

plicable 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, adjusting, or servicing of any component.

1.3 Equipment, installation, and all starting and control devices must com-

ply with details 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 be-

tween starter and machine.

II. POWER WIRING TO STARTER

2.0 Power conductor rating must meet minimum unit nameplate voltage

and compressor motor RLA.

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 con-

ductorsbe sized beyond the minimum ampacity required. Contact starter

supplier for lug information.

2.2 Compressor motor and controls must be grounded by using equip-

ment 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 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.

3.2 Remove jumper wire between 12A and 12B before connecting auxil-

iary safeties between these terminals.

3.3 Pilot 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

pumpand tower fan motor are controlled by other means, also provide

aparallel 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 alongside wires carrying 50 v or

higher.

3.5 Voltage selector switch in machine power panel is factory set for

115v 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 minimum rating of 600 v,80 C. Ground shield at starter.

3.7 If optional oil pump circuit breaker is not supplied within the starter en-

closure as shown, it must be located within sight of the machine with

wiring routed to suit.

3.8 For 19XR chillers with free-standing starts, 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

thecompressor motor starter terminals (LL1 and LL2). An outside power

source will produce dangerous voltage at the line side of the starter,

becausesupplying voltage at the transformer secondary terminals pro-

duces input level voltage at the transformer primary terminals.

IV. POWER WIRING BETWEEN STARTER AND COMPRESSOR MOTOR

4.0 Low voltage (600 v or less) compressor motors have (6)

⁄

in.terminal

studs (lead connectors not supplied by Carrier). Either 3 or 6 leads

mustbe run between compressor 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

betweenterminals is 2

⁄

inches.Compressor motor starter must have

nameplate stamped as conforming with Carrier requirement Z-375.

4.1 When more than one conduit is used to run conductors from starter to

compressormotor terminal box, one conductor from each phase must

be in each conduit to prevent excessive heating. (e.g., conductors to

motor terminals 1,2&3inoneconduit,and those to 4,5&6in

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 con-

tractorto suit conduit. Flexible conduit should be used for the last few

feetto the terminal box for unit vibration isolation. Use of stress cones

or12 conductors larger than 500 MCM may require an oversize (spe-

cial) motor terminal box (not supplied by Carrier). Lead connections

between3-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 Na-

tionalElectrical Code (NFPA-70) and applicable codes. Means for ground-

ing compressor motor is a pressure connector for No. 4 to 500 MCM

wire,supplied and located in the back lower left side corner of the com-

pressor 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. Torqueto 45 lb-ft max.

Fig. 29 — 19XR Typical Field Wiring with Free-Standing Starter

IMPORTANT: Wiring shown is typical and not intended to show detail

for a speciﬁc installation. Refer to certiﬁed ﬁeld wiring diagrams.

AWG — American Wire Gage

N.C. — NormallyClosed

N.O. — NormallyOpen

PR — Pilot Relay

RLA — RatedLoad Amps

SMM — Starter Management

Module

TB — TerminalBlock

Required Power Wiring

Required Control Wiring

Options Wiring