Table 48: Programmable
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Count Limit
Operator
Standard
Allows the user to define the maximum number of surge events (4 to 20;
default 15) that can occur within a defined period of time before an Excess
Surge situation is detected. If the Surge Window Count exceeds the Count
Limit.
When an Excess Surge situation is detected, the action depends upon the
following:
•
If both the Shutdown and Extended Run Setpoints are Disabled,
the chiller continues to run, displaying the message
WARNING –
EXCESS SURGE DETECTED
. Refer to Hot Gas Bypass and Variable
Speed Drive exceptions. See
Extended Run (Enabled/Disabled)
in Table 48.
•
If the Shutdown Setpoint is Enabled and the Extended Run Setpoint
is Disabled, the chiller performs a safety shutdown and displays
Surge Protection – Excess Surge
. Refer to Hot Gas Bypass
and Variable Speed Drive exceptions. See
Extended Run (Enabled/Disabled)
in Table 48.
•
If the Shutdown Setpoint is Disabled and the Extended Run Setpoint
is Enabled, the Pre-rotation Vanes are driven closed for 10 minutes
and
WARNING – SURGE PROTECTION – EXCESS SURGE LIMIT
is
displayed. When the 10 minutes have elapsed, if the Surge Window
Count is less than or equal to the Count Limit, this message and
load inhibit are automatically cleared. Alternating with this message
is
WARNING – EXCESS SURGE DETECTED
that continues after
the 10 minute period has elapsed until manually cleared with the
Warning Reset key. Refer to Hot Gas Bypass and Variable Speed
Drive exceptions. See
.
•
If both the Shutdown and Extended Run Setpoint are Enabled, the
10 minute Extended Run mode is invoked as described previously.
However, if the Surge Window Count exceeds the Count Limit at
the completion of the 10 minute Extended Run period, a safety
shutdown is performed and
Surge Protection – Excess Surge
is displayed. Refer to Hot Gas Bypass and Variable Speed Drive
exceptions. See
Surge
Sensitivity
Service
JCI Service
Allows the user to define the surge detection sensitivity of the Surge
Protection feature. Selectable over the range of 0.3 to 1.3; default 0.3. The
smaller the number, the greater the sensitivity.
Clear Surge
Count
Admin
Admin
Allows user to set the Total Surge Count to zero.
Table 49: Navigation
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Home
View
View
Returns the user to Home screen.
Compressor
View
View
Returns the user to Compressor screen.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
66
