York YCAV0569 Installation Operation & Maintenance page 219

Local / Remote Control Mode Selection
Local or Remote Control Mode allows the user to select
the chilled liquid temperature control mode.
OPTIONS LOCAL / REMOTE CONTROL MODE
◄ ► XXXXXXXXXXXXXXXXXX
When LOCAL CONTROL mode is selected, chilled
liquid control is from the keypad of the chiller. In local
mode, a remote device can read system data, but not
reset operating parameters.
OPTIONS LOCAL / REMOTE CONTROL MODE
◄ ► LOCAL CONTROL
When REMOTE CONTROL mode is selected, control
of the chilled liquid setpoint is from a remote device
such as an ISN/BAS controller.
OPTIONS LOCAL / REMOTE CONTROL MODE
◄ ► REMOTE CONTROL
The default mode will be LOCAL.
Display Units Selection
Imperial or SI display units may be selected for data
display.
OPTIONS DISPLAY UNITS
◄ ► XXXXXXXXXXXXXXXXXX
The user may select system operating temperatures
and pressures to be displayed in either SI (°C, Barg) or
Imperial units (°F, PSIG).
OPTIONS DISPLAY UNITS
◄ ► IMPERIAL
OPTIONS DISPLAY UNITS
◄ ► SI
The default mode is IMPERIAL.
JOHNSON CONTROLS
OPTIONS KEY (CON'T)
System Lead/Lag Control Mode Selection
The operator may select the type of lead/lag control
desired.
OPTIONS
◄ ►
In most cases, automatic lead/lag will be selected. When
automatic lead/lag is selected, the micro will attempt
to balance run time by switching the lead compressor
whenever all compressors are shut off. If a compres-
sor is not able to run when the micro attempts a start,
the micro will select another compressor in an effort to
control chilled liquid temperature. Manual lead/lag al-
lows selecting a specific compressor to be the lead. If
#2 is selected as the lead in a 3 compressor chiller, the
sequence will be 2, 3, and 1.
OPTIONS
◄ ►
The default mode will be AUTOMATIC.
Lag selections of individual systems will appear as:
OPTIONS
◄ ►
OPTIONS
◄ ►
OPTIONS
◄ ►
SYSTEM 3 LEAD may be selected only on 3 and 4
compressor units.
OPTIONS
◄ ►
SYSTEM 4 LEAD may be selected only on 4 compres-
sor units.
FORM 201.21-NM2 (616)
LEAD / LAG CONTROL MODE
XXXXXXXXXXXXXXXXXX
LEAD / LAG CONTROL MODE
AUTOMATIC
LEAD / LAG CONTROL MODE
MANUAL SYS 1 LEAD
LEAD / LAG CONTROL MODE
MANUAL SYS 2 LEAD
LEAD / LAG CONTROL MODE
MANUAL SYS 3 LEAD
LEAD / LAG CONTROL MODE
MANUAL SYS 4 LEAD
8
219