Table 92: Safety shutdown messages
Message Description
EVAPORATOR –
TRANSDUCER OR
TEMPERATURE
SENSOR
A possible defective Evaporator pressure Transducer or Refrigerant
Temperature Sensor has been detected. The control center converts the
evaporator pressure to a Saturated Temperature value and compares this value
to the optional Evaporator Refrigerant Temperature Sensor. If the difference
between these temperatures is greater than 3.0°F, continuously for 1 minute,
this shutdown is performed. This check is only performed under the following
conditions:
• Chiller has been running for at least 10 minutes
• Evaporator Refrigerant temperature (RT7) has been enabled by a service
technician using instructions in YORK YMC
2
Service Manual (Form 160.84-
M2).
• NOT in Brine cooling mode
• Smart Freeze is enabled
• Evaporator Temperature Sensor (RT7) or Evaporator Saturation
Temperature is indicating a temperature of less than 32.0°F (0°C).
The chiller can be started after the temperatures are within 3.0°F (1.77°C) of one
another and the CLEAR FAULT key is pressed.
INTERNAL
ERROR –
INVALID BRAM
BRAM is detected to be a size other than 512K. Clears when correct size BRAM is
detected upon boot up.
ISOLATION
VALVES – NOT
OPENED
The optional brine freeze protection motorized isolation valves Open output is
energized > 40 seconds but the feedback from the valve limit switch does not
indicate it opened for 3 continuous seconds. This cycling fault is released when
the chiller is stopped with the run command removed. The chiller can be started
when the condition is released and the OptiView panel CLEAR FAULTS key is
pressed.
MBC –
CUSTOMER
SERIAL LINK
DISABLED
This Safety Shutdown is set when the MBC Local/Remote Modbus command
is not reported from the MBC as set for panel control. This would be caused
if the MBC were accessed via a computer using diagnostic software and the
serial communication setting then changed in the Remote Command tab from
Customer Serial Link to another choice. The chiller can be started when the MBC
setting is restored and the OptiView
™
panel CLEAR FAULTS key is pressed.
MBC – DSP
COMMUNICATION
This Safety Shutdown is set when the MBC control board detects a
communication error within the control board of the MBC. The MBC Fault
contacts open. The MBC remains in Levitation mode with the motor shaft
levitated until commanded to de-levitate over serial comms. This shutdown is
released when the board-level communication failure is resolved. The chiller can
be started when the condition is released and the OptiView panel CLEAR FAULTS
key is pressed.
YMC
2
Mod B with OptiView
™
Control Center
128
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