York YK Style H Operation Manual page 66

Table 48: Programmable
V09 software
Button
and earlier
Count Limit Operator
Surge
Service
Sensitivity
Clear Surge
Admin
Count
Table 49: Navigation
V09 software
Button
and earlier
Home View
Compressor View
66
V10 and later
with YORK
Description
Chiller Access
Manager
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)
• 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
Disabled)
• If the Shutdown Setpoint is Disabled and the Extended Run Setpoint
Standard
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
Run
• 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
(Enabled/Disabled).
Allows the user to define the surge detection sensitivity of the Surge
JCI Service Protection feature. Selectable over the range of 0.3 to 1.3; default 0.3. The
smaller the number, the greater the sensitivity.
Admin Allows user to set the Total Surge Count to zero.
V10 and later
with YORK
Description
Chiller Access
Manager
View Returns the user to Home screen.
View Returns the user to Compressor screen.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
Shutdown (Enabled/Disabled)
and Extended Run (Enabled/Disabled)
Shutdown (Enabled/Disabled)
(Enabled/Disabled).
Shutdown (Enabled/Disabled)
and
in Table 48.
Shutdown (Enabled/
in Table 48.
and Extended
and Extended Run