York YCAV0569, Installation Operation & Maintenance

Page: 219 / 278

219
JOHNSON CONTROLS
FORM 201.21-NM2 (616)
8
OPTIONS KEY (CON'T)
Local / Remote Control Mode Selection
Local or Remote Control Mode allows the user to select
the chilled liquid temperature control mode.
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
◄ ► XXXXXXXXXXXXXXXXXX
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 LEAD / LAG CONTROL MODE
◄ ► XXXXXXXXXXXXXXXXXX
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 LEAD / LAG CONTROL MODE
◄ ► AUTOMATIC
OPTIONS DISPLAY UNITS
◄ ► SI
OPTIONS LEAD / LAG CONTROL MODE
◄ ► MANUAL SYS 1 LEAD
The default mode is IMPERIAL.
OPTIONS LEAD / LAG CONTROL MODE
◄ ► MANUAL SYS 2 LEAD
System Lead/Lag Control Mode Selection
The operator may select the type of lead/lag control
desired.
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 LEAD / LAG CONTROL MODE
◄ ► MANUAL SYS 3 LEAD
The default mode will be AUTOMATIC.
Lag selections of individual systems will appear as:
OPTIONS LEAD / LAG CONTROL MODE
◄ ► MANUAL SYS 4 LEAD
SYSTEM 3 LEAD may be selected only on 3 and 4
compressor units.
SYSTEM 4 LEAD may be selected only on 4 compres-
sor units.