JOHNSON CONTROLS
72
FORM 160.69-O1
ISSUE DATE: 9/30/2012
SECTION 2 – OPTIVIEW CONTROL CENTER
Low Load and Low Load Time
Access Level Required:
SERVICE
Allows the user to define the criteria that determines
if the lag compressor should be shutdown because the
lead compressor is meeting the load requirement. After
the 30 minute Minimum Run Time (see “Waiting Min-
imum Run Time” above), if the lead compressor motor
current goes below the Low Load Setpoint (20% to
60%; default 45%) for a period of time equal to the
Low Load Time Setpoint (1 to 20 minutes; default 5),
a Soft Shutdown will be performed on the lag com-
pressor. Service Technicians refer to Service Manual
160.69-M1.
Compressor Lockout
Access Level Required:
OPERATOR
Allows the user to lockout compressor #1 or #2. When
locked out, the selected compressor will be prevented
from running.
With software version C.OPT.11.03.01.004 (and later),
a compressor can be locked-out while both compres-
sors are running, without shutting down the entire
chiller. A soft shutdown will be performed on the run-
ning compressor selected for lockout and its status is
changed to lag (if not already the lag compressor al-
ready). Upon completion of coastdown, the selected
compressor will remain locked out until the lockout is
released. With previous software versions, a compres-
sor can be locked-out only while it is shutdown.
Compressor Mode
(Software version C.OPT.11.03.01.004 (and later)
Access Level Required:
OPERATOR
Allows the user to select either NORMAL or SINGLE
COMPRESSOR operating mode. In Normal Mode,
the second compressor is brought on line to meet the
load requirement as described in SECTION 1. In Sin-
gle Compressor Mode, operation is restricted to one
compressor only. When starting the chiller in Single
Compressor mode, the operator does not designate
which compressor will run. Rather, the “Lead” com-
pressor is automatically selected by the software per
normal operation. The “lag” compressor will not be
brought on line, regardless of the load requirement. If
Single Compressor Mode is selected while both com-
pressors are running, a soft shutdown is performed
on the “Lag” compressor. All faults for this inhibited
compressor are continued to be handled. If the chill-
er is shutdown while running in Single Compressor
mode, the software selects the “Lead” compressor as
it normally does on a subsequent restart.
Navigation
Home
Access Level Required:
VIEW
Causes a return to the Home Screen
Compressor
Access Level Required:
VIEW
Causes a return to the Compressor Screen