Starting Equipment
The 19XL requires a motor starter to operate the centrifugal hermetic compressor motor, the
oil pump, and various aux il iary equipment. The starter serves as the ma in f ield wiring interfa c e
for the contractor.
Three types of starter s ar e av ai lable from Carrier Cor po ration: solid-st at e, wye-delta, and
across-the-line starters. See Carrier Specification Z-375 for specific starter requirements. All
starters must meet these specifications in or der t o properly start and sat is f y mechanical safet y
requirements. Start ers may be supplied as sep arate, free-stand ing units, or may be moun te d
directly on the chiller ( un it mounted) for low-v ol tage units only.
Inside the starter are 3 se par a te circuit breakers . Ci rcuit breaker CB1 is the c om p ressor
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 break er (CB1) on the front of th e starter disconnec ts the ma in
motor current only. P ow er is still energized for the other circuits. Tw o mo re cir-
cuit breakers inside the starter must be turned off to disconnect power to the oil
pump, PIC controls, and oil heater.
WARNING !WARNING