Carrier 19XL - Manual (Page 47)

Starting Equipment
The 19XL requires a motor starter to operate the centrifugal hermetic compressor motor, the
oil pump, and various auxiliary equipment. The starter serves as the main field wiring interface
for the contractor.
Three types of starters are available from Carrier Corporation: solid-state, wye-delta, and
across-the-line starters. See Carrier Specification Z-375 for specific starter requirements. All
starters must meet these specifications in order to properly start and satisfy mechanical safety
requirements. Starters may be supplied as separate, free-standing units, or may be mounted
directly on the chiller (unit mounted) for low-voltage units only.
Inside the starter are 3 separate circuit breakers. Circuit breaker CB1 is the compressor
motor circuit breaker. The disconnect switch on the starter front cover is connected to this
breaker. Circuit breaker CB1 supplies power to the compressor motor.
The main circuit breaker (CB1) on the front of the starter disconnects the main
motor current only. Power is still energized for the other circuits. Two more cir-
cuit breakers inside the starter must be turned off to disconnect power to the oil
pump, PIC controls, and oil heater.
WARNING
!
WARNING