Specifications

options. The LID has a STOP button, an alarm light, 4 but-
tons for logic inputs, and a display. The function of the
4 buttons or ‘‘softkeys’’ are menu driven and are shown on
the display directly above the key.
6-PACK RELAY BOARD — This device is a cluster of
6 pilot relays located in the control center. It is energized by
the PSIO for the oil pump, oil heater, alarm, and optional hot
gas bypass relay.
8-INPUT MODULES — One optional module is factory in-
stalled in the control center when ordered. There can be up
to 2 of these modules per chiller with 8 spare inputs each.
They are used whenever chilled water reset, demand reset,
or reading a spare sensor is required. The sensors or 4 to
20 mA signals are field-installed.
The spare temperature sensors must have the same
temperature/resistance curve as the other temperature sen-
sors on this unit. These sensors are 5,000 ohm at 75 F
(25 C).
OIL HEATER CONTACTOR (1C) — This contactor is lo-
cated in the power panel and operates the heater at 115 v. It
is controlled by the PIC to maintain oil temperature during
machine shutdown.
OIL PUMP CONTACTOR (2C) — This contactor is located
in the power panel. It operates all 200 to 575-v oil pumps.
The PIC energizes the contactor to turn on the oil pump as
necessary.
HOT GAS BYPASS CONTACTOR RELAY (3C)
(Optional) — This relay, located in the power panel, con-
trols the opening of the hot gas bypass valve. The PIC en-
ergizes the relay during low load, high lift conditions.
Fig. 5 — 19EF Controls and Sensor Locations
9