Specifications

Catalog WSC/WDC-4 39

Motor Controllers

Motor Starters

McQuay has a wide variety of starter types and options to fit virtually all applications. The

specifics of the final selection of size, enclosure, and options are covered in the catalog

Starters

. Please consult the local McQuay sales office or the starter catalog for starter details.

This section contains a general overview only.

Mounting Options, Low Voltage, 200 to 600 Volts

Factory-mounted; starters furnished, mounted and wired in the factory. Due to shipping width

limitations, the starters for WSC 100 through 126 are shipped loose with cable kits and mounting

brackets for field installation and connection on the units by others.

Freestanding

; furnished by McQuay and drop shipped to the job site for setting and wiring by

others.

Starters by others

; starters furnished by others must meet McQuay Specification R35999901,

available from the local McQuay sales office. The starters are furnished and installed by others.

Table 4, Starter Mounting Arrangements

Size

Factory-

Mounted

Free-

Standing

Brackets &

Cables

WSC/WDC 050-087 X X

WSC 100-126 X X

WDC 100-126 X

Mounting Options, Medium Voltage, 2300 to 6000 Volts

All starter types in these voltages are for field setting and wiring only.

Starter Types and Descriptions

Solid state starters are available for both low and medium voltages and are similar in construction

and features regardless of voltage.

For low voltage application, Wye-Delta Closed Transition starters are available, in addition to

solid state.

For medium voltage application, autotransformer, primary reactor reduced voltage and across-the-

line starters are offered in addition to solid state.

Variable Frequency Drives (VFD)

VFDs are available on all McQuay chillers including up to 2500 tons. The fact that the larger

chillers have dual compressors allows the VFD option at a reasonable price.