York YS - Application Data - Environmental and Electrical; Electrical Considerations for Motors and Controls

25JOHNSON CONTROLS
FORM 160.80-EG1 (808)
TABLE 2 – MOTOR VOLTAGE VARIATIONS
vertical-leg dirt trap to catch vent-stack condensation.
Vent piping must be arranged to avoid imposing a strain
on the relief connections and should include one exible
connection.
SOUND AND VIBRATION CONSIDERATIONS
A Millennium chiller is not a source of objectionable sound
and vibration in normal air conditioning applications.
Neoprene isolation mounts are furnished as standard
with each unit. Optional level-adjusting spring isolator as-
semblies designed for 1” static deection are available.
Millennium chiller sound pressure level ratings will be
furnished upon request.
Control of sound and vibration transmission must be taken
into account in the equipment room construction as well
as in the selection and installation of the equipment.
THERMAL INSULATION
No appreciable operating economy can be achieved by
thermally insulating the chiller. However, the chiller’s
cold surfaces should be insulated with a vapor barrier
insulation sufcient to prevent condensation. A chiller can
be factory insulated with 3/4” (19mm) or 1-1/2” (38mm)
thick insulation, as an option. This insulation will normally
prevent condensation in environments with dry bulb tem-
peratures of 50°F to 90°F (10°C to 32°C) and relative
humidities up to 75% [3/4” (19mm) thickness] or 90% [1-
1/2” (38mm) thickness]. The insulation is painted and the
surface is exible and reasonably resistant to wear. It is
intended for a chiller installed indoors and, therefore, no
protective covering of the insulation is usually required.
If insulation is applied to the water boxes at the job site,
it must be removable to permit access to the tubes for
routine maintenance.
VENTILATION
The ASHRAE Standard 15 Safety Code for Mechanical
Refrigeration requires that all machinery rooms be vented
to the outdoors utilizing mechanical ventilation by one
or more power-driven fans. This standard, plus National
Fire Protection Association Standard 90A, state, local
and other related codes should be reviewed for specic
requirements. Since the Millennium chiller motor is air-
cooled, ventilation should allow for the removal of heat
from the motor.
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. Medium voltage (2300 - 4160
volts) motors have three 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 nameplate
is stamped with the specic motor voltage and frequency
for the appropriate motor.
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 Johnson Controls Standard
R-1079 Specication. 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-mechanical starters.
No eld control wiring is required, when the YORK SSS
is supplied.
Copper Conductors – Only copper conductors should be
connected to compressor motors and starters. Aluminum
conductors have proven to be unsatisfactory when con-
nected to copper lugs. Aluminum oxide and the difference
Sheet1
Page 1
Freq Rated Voltage
Operating Voltage
Min. Max.
60Hz
200 200/208 180 220
230 220/240 208 254
380 380 342 415
416 416 375 457
460 440/460/480 414 508
575 575/600 520 635
2300 2300 2070 2530
3300 3300 2970 3630
4000 4000/4160 3600 4576
50Hz
346 346 311 381
380 380/400 342 423
415 415 374 440
3300 3300 2970 3630
Nameplate
Voltage