Specifications

INTEGRATED STARTER MODULE (ISM) — This mod-

ule is located in the starter cabinet. This module initiates com-

mands from the CVC for starter functions such as starting

and stopping the compressor, condenser, chilled water pumps,

tower fan, spare alarm contacts, and the shunt trip. The ISM

monitors starter inputs such as line voltage, motor current,

ground fault, remote start contact, spare safety, condenser

high pressure, oil pump interlock, starter 1M, and run con-

tacts. The ISM contains logic capable of safety shutdown. It

shuts down the chiller if communications with the CVC

are lost.

CHILLER CONTROL MODULE (CCM) — This module

is located in the control panel. The CCM provides the input

and outputs necessary to control the chiller. This module moni-

tors refrigerant pressure, entering and leaving water tem-

peratures, and outputs control for the guide vane actuator,

oil heaters, and oil pump. The CCM is the connection point

for optional demand limit, chilled water reset, remote tem-

perature reset, and refrigerant leak sensor.

OIL HEATER CONTACTOR (1C) — This contactor is lo-

cated in the power panel (Fig. 11) and operates the heater at

either 115 or 230 v. It is controlled by the PIC II to maintain

oil temperature during chiller shutdown.

OIL PUMP CONTACTOR (2C) — This contactor is located

in the power panel. It operates all 200 to 575-v oil pumps.

The PIC II energizes the contactor to turn on the oil pump

as necessary.

HOT GAS BYPASS CONTACTOR RELAY (3C) (Op-

tional) — This relay, located in the power panel, controls the

opening of the hot gas bypass valve. The PIC II energizes

the relay during low load, high lift conditions.

CONTROL TRANSFORMERS (T1, T2) — These trans-

formers convert incoming control voltage to 24 vac power

for the 3 power panel contactor relays, CCM, and CVC.

Fig. 8 — Control Sensors (Temperature)

Fig. 9 — Control Sensors

(Pressure Transducers, Typical)