York YT Millennium, Operating & Maintenance, Page: 97 / 156

FORM 160.55-O1 (920)
97
YORK INTERNATIONAL
“ WARNING – REFRIGERANT LEVEL OUT OF
RANGE ”
(Flash Memory Card version C.MLM.02.02C.xxx
and earlier)
The output of the Condenser Refrigerant Level Sensor is
> 5.1VDC. This is indicative of a Level Sensor failure.
While this condition exists, the Refrigerant Variable Or-
ifice is driven to the full open position. This message
automatically clears when the Refrigerant Level sensor
output is within range.
“ WARNING - EXCESS SURGE DETECTED ”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
(Applies only if Surge Protection SHUTDOWN feature
is Disabled.) The Surge Window Count has exceeded
the Count Limit. Message can be manually cleared
after the Surge Window Count is < the Count Limit,
the SHUTDOWN feature is Enabled or the chiller is
stopped. To clear message press WARNING RESET
key on HOME Screen when logged in at OPERATOR
(or higher) access level.
“WARNING – SURGE PROTECTION – EXCESS
SURGE LIMIT”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
(Applies only if Surge Protection EXTENDED RUN
feature is Enabled.) Displayed during the Surge Protec-
tion 10 minute Extended Run period. This period begins
when the Surge Window Count exceeds the Count Limit.
During this period, the Pre-rotation Vanes are driven
closed. When 10 minutes have elapsed, this message
and the Pre-rotation Vanes load inhibit are automatically
cleared. Message and load inhibit are also cleared when
the chiller is shutdown.
If the optional Hot Gas Bypass feature
is enabled, the valve position must be
at 100% before the Extended Run is
implemented. If the chiller is chiller is
equipped with a compressor motor Vari-
able Speed Drive, the output frequency
must be at full speed (50 Hz/60 Hz) be-
fore this control can be implemented.
ROUTINE SHUTDOWN MESSAGES
“
REMOTE STOP
”
A shutdown command has been received from a re-
mote device. Remote Stop commands can be received
in Digital Remote mode via I/O Board TB4-7/8 or in
ISN (Integrated Systems Network) Remote mode via
the MicroGateway serial communications.
“ LOCAL STOP ”
A local shutdown command has been received by plac-
ing the Keypad Start-Run-Stop/Reset Switch in the stop
(O) position.
“ PLACE COMPRESSOR SWITCH IN RUN PO-
SITION ”
The OptiView Control Center is in either Digital or ISN
(Integrated Systems Network) Remote mode. The Op-
erator is requested to place the COMPRESSOR Switch
in the RUN position. The OptiView Control Center
will not accept a Remote start/stop command unless
the switch is in the RUN position.
CYCLING SHUTDOWN MESSAGES
“ MULTIUNIT CYCLING – CONTACTS OPEN ”
The Multiunit Cycling contacts connected to I/O Board
TB4-9, have opened to initiate a cycling shutdown. The
chiller will automatically restart when the contacts close.
“ SYSTEM CYCLING – CONTACTS OPEN ”
The System Cycling contacts connected to I/O Board
TB4-13, have opened to initiate a cycling shutdown.
The chiller will automatically restart when the contacts
close.
“ OIL – LOW TEMPERATURE ”
The oil temperature has decreased to < 55°F. The chiller
will automatically restart when the temperature increases
to > 71.0°F.
“ CONTROL PANEL – POWER FAILURE ”
A Control Power failure has occurred. If the power
failure occurred while the chiller was running, it will
automatically restart when power is restored. However,
if the power failure duration was < the duration of the
applicable “Coastdown” period (2.5 minutes standard;
15 minutes steam turbine) when power is restored, the
remainder of the “Coastdown” will be performed, prior
to the chiller starting. This message can indicate a Cy-
cling (auto-restart after power failure) or Safety (manual
restart after power failure) shutdown, depending upon
OptiView Control Center configuration. It indicates a
cycling shutdown when displayed in orange characters;
Safety shutdown when displayed in red characters. The
OptiView Control Center is configured for auto-restart or
manual restart after power failure by a qualified Service
Technician.
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