York YR User Manual download pdf (Page 22)

YORK INTERNATIONAL

FORM 160.81-EG1

Application Data (continued)

In addition, the ASHRAE Standard 15 requires a refriger-

ant vapor detector to be employed for all refrigerants. It is

to be located in area where refrigerant from a leak would

be likely to concentrate. An alarm is to be activated and

the mechanical ventilation started at a value no greater

than the TLV (Threshold Limit Value) of the refrigerant.

ELECTRICAL CONSIDERATIONS

Motor Voltage – Low voltage motors (200 - 600 volts)

are furnished with six leads. Motor circuit conductor size

must be in accordance with the National Electrical Code

(NEC), or other applicable codes, for the motor full-

load amperes (FLA). Flexible conduit should be used

for the last several feet to the chiller in order to provide

vibration isolation. Table 2 lists the allowable variation

in voltage supplied to the chiller motor. The unit name-

plate is stamped with the specific motor voltage and fre-

quency for the appropriate motor.

Power Factor Correction Capacitors – Capacitors can

be applied to a chiller for the purpose of power factor

correction. For remote-Mounted Electro-Mechanical

Starters, the capacitors should be located on the load

side of the starter. For YORK SSS, the capacitors must

be located on the line side of the starter. The capacitors

must be sized and installed to meet the National Elec-

trical Code (NEC) and be verified by YORK.

Ampacity on Load Side of Starter – Electrical power

wire size to the chiller is based on the minimum unit

ampacity. For YORK SSS, this wiring is done at the

factory. For remote starters, the National Electrical Code

defines the calculation of ampacity, as summarized be-

low. More specific information on actual amperage rat-

ings will be supplied with the submittal drawings.

• Six-lead type of starting (Star-Delta)

Minimum circuit ampacity per conductor (1 of 6):

Ampacity = .721 x compressor motor amps.

• Three-lead type of starting

(Across-the-Line, Autotransformer and

Primary Reactor)

Minimum circuit ampacity per conductor (1 of 3):

Ampacity = 1.25 x compressor motor amps.

Ampacity on Line Side of Starter –

The only additional load on the circuit for the chiller

would be the control transformer, unless it is supplied

by a separate source.

125% of compr.

FLA of all other

Min. Circuit Ampacity =

motor amps loads on the circuit

Branch Circuit Overcurrent Protection – The branch

circuit overcurrent protection device(s) should be a time-

delay type, with a minimum rating equal to the next stan-

dard fuse/breaker rating above the calculated value. It is

calculated taking into account the compressor motor

amps and may also include control transformer. Refer

to submittal drawings for the specific calculations for each

application.

MOTOR ELECTRICAL DATA

The full-load amperes (FLA) listed in Tables 3 and 4

are maximum values and correspond to the maximum

motor kW listed. When the Input power (kW) is less

than maximum motor kW, the FLA should be reduced

using the following equation:

Starters – The chiller is available with a factory-mounted

and wired YORK Solid State Starter for 200 - 600 volt

applications. Other types of remote mounted starters

are available. These electro-mechanical starters must

be furnished in accordance with YORK Standard R-

1131. Specification. This will ensure that starter com-

ponents, controls, circuits, and terminal markings will

be suitable for required overall system performance.

Controls – A 115 volt, single phase, 60 or 50 Hertz

(4.5 kVa) power supply must be furnished to the chiller

from a separate, fused disconnect or from a control

transformer included as an option with electro-mechani-

cal starters. No field control wiring is required, when

the YORK SSS is supplied.

Copper Conductors – Only copper conductors should

be connected to compressor motors and starters. Alu-

minum conductors have proven to be unsatisfactory

when connected to copper lugs. Aluminum oxide and

the difference in thermal conductivity between copper

and aluminum cannot guarantee the required tight con-

nection over a long period of time.

TABLE 2 – MOTOR VOLTAGE VARIATIONS

200 200/208 180 220

230 220/240 208 254

380 380 342 415

460 440/460/480 414 508

575 575/600 520 635

380 380/400 342 423

415 415 374 440

60 HZ

50 HZ

FREQ.

RATED

VOLTAGE

NAMEPLATE

VOLTAGE

MIN. MAX.

OPERATING VOLTAGE

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 39 40

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