FORM 160.54-O1
51
JOHNSON CONTROLS
Surge Window Count
Displays the number of surge events that have oc-
curred in the last 1 to 5 minutes as programmed with
the COUNT WINDOW setpoint. If the chiller has been
running for less than the COUNT WINDOW minutes, it
is the number of surge events that have occurred within
the last number of minutes displayed as the SURGE
WINDOW TIME. The count is cleared when the chiller
shuts down.
Surge Avoidance Surge Detected (LED)
Illuminates momentarily when a surge is detected by the
Surge Protection feature. If equipped with a VSD or MV
VSD these are only the surges detected while the drive
is running at maximum frequency.
If equipped with software version C.OPT.01.18.307 or
earlier, this is displayed as “SURGE DETECTED”. It
illuminates momentarily when a surge is detected by
the Surge Protection feature. If equipped with a VSD,
it illuminates whenever a surge is detected, regardless
of the VSD operating speed.
ACC Surge Detected (LED)
[Software version C.OPT.01.19.307 and later only.
Only displayed if equipped with a VSD (in MODBUS
protocol conguration only) or MV VSD] Illuminates
momentarily when a surge is detected by the ACC func-
tion in the Microboard, while the drive is running at
less than maximum frequency.
Surge Avoidance Surge Count
(Displayed as “Total surge Count” in software version
C.OPT.01.15.307 and earlier)
This is the total number of surges accumulated by the
Surge Protection feature. If equipped with a VSD or
MV VSD, it is only the surges detected while the drive
is running at maximum frequency.
Extended Run Time Remaining
Displays the time remaining in the 10-minute “EX-
TENDED RUN” period. During this period, the Pre-
rotation vanes are driven closed and “WARNING –
SURGE PROTECTION – EXCESS SURGE LIMIT”
is displayed. Refer to operation under “Count Limit”
below.
PROGRAMMABLE
Shutdown (Enabled/Disabled)
Access Level Required: OPERATOR
Allows the user to select whether the chiller will shut-
down or continue to run when an Excess Surge situation
has been detected.
If this setpoint is Enabled and the EXTENDED RUN
setpoint is Disabled, a safety shutdown is performed
when the SURGE WINDOW COUNT exceeds the
COUNT LIMIT setpoint.
If this setpoint is Enabled and the EXTENDED RUN
setpoint is Enabled, a safety shutdown is performed if
the SURGE WINDOW COUNT exceeds the COUNT
LIMIT setpoint at the completion of the 10 minute Ex-
tended Run period.
“Surge Protection – Excess Surge” is displayed with
either shutdown.
If this setpoint is Disabled, refer to operation under
“Count Limit” below.
With Software version C.MLM.01.09.xxx (and later) or
C.OPT.01.09.301 (and later):
• If equipped with a compressor Variable Speed
Drive (VSD), the VSD output frequency must be
at maximum before the SHUTDOWN feature is
implemented or surge warning messages are dis-
played.
• If equipped with a VSD and Hot Gas Bypass
(Enabled), the VSD output frequency must be at
maximum AND the Hot Gas Valve must be at 100%
before the SHUTDOWN feature is implemented or
surge warning messages are displayed.
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