York YR Manual page 91

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
• Chiller has been running for at least 10 minutes.
• Evaporator Refrigerant Temperature Sensor (RT7)
has been enabled by a Service Technicians using
instructions in OptiView Control Center Service
Instructions (Form 160.81-M1).
• Not in Brine Cooling mode.
• Smart Freeze is enabled.
• Evaporator Temperature Sensor (RT7) or Evapo-
rator Saturation Temperature is indicating a tem-
perature of less than 32.0 ºF.
The chiller can be started after the temperatures are
within 3.0ºF of one another and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
CONDENSER – HIGH PRESSURE CONTACTS OPEN
The contacts of the Electro-Mechanical high pressure
safety device, located on the condenser shell, have
opened because this device has detected a pressure
more than 200.0 PSIG. The contacts will automati-
cally close when the condenser pressure decreases to
less than 140.0 PSIG. The chiller can be started after
the contacts close and the COMPRESSOR switch is
placed in the Stop-Reset (O) position.
CONDENSER – HIGH PRESSURE
The condenser pressure, as sensed by the Condenser
Transducer, has increased to more than190.0 PSIG.
The chiller can be started after the pressure decreases
to less than 150.0 PSIG and the COMPRESSOR switch
is placed in the Stop-Reset (O) position.
CONDENSER – HIGH PRESSURE – STOPPED
(Software versions C.MLM.05.05.xxx and later or
C.OPT.05.05.302 (and later)) The condenser pressure
exceeded 170.0 PSIG while the chiller was stopped.
High temperature condenser water flowing through the
condenser while the chiller is shutdown can cause a
condenser high pressure condition resulting in loss of
refrigerant. This safety fault anticipates this problem
by annunciating the condenser high pressure condition.
The chiller can be restarted after a Service Technician
performs a special reset preset procedure contained in
OptiView Control Center Service Instructions (Form
160.81-M1).
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
CONDENSER – PRESSURE TRANSDUCER OUT
OF RANGE
The Condenser Pressure Transducer is indicating a
pressure that is more than 315.0 PSIG. This is outside
the normal operating range of the transducer. This is
generally indicates a defective transducer. The chiller
can be started after the transducer is indicating a pres-
sure that is within range and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
AUXILIARY SAFETY – CONTACTS CLOSED
The Auxiliary safety shutdown contacts, connected to
I/O Board TB4-31 have closed, initiating a safety shut-
down. This input is a general-purpose, user defined
safety shutdown input. The chiller can be started after
the contacts open and the COMPRESSOR switch is
placed in the Stop-Reset (O) position.
DISCHARGE – HIGH PRESSURE
The discharge pressure, as sensed by the Discharge
Pressure Transducer, has increased to more than190
PSIG. The chiller can be started after the pressure de-
creases to less than 189.5 PSIG and the COMPRES-
SOR switch is placed in the Stop-Reset (O) position.
DISCHARGE – HIGH TEMPERATURE
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has increased to more than
175.0º F. The chiller can be started after the temperature
decreases to less than 175.0º F and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
DISCHARGE – LOW TEMPERATURE
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has decreased to less than
30.0º F. The chiller can be started after the temperature
increases to more than 30.0º F and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
EXCESSIVE LOW DISCHARGE SUPERHEAT
(Software version C.MLM.05.04.xxx (and later))
The chiller has accumulated more than or equal to 30
minutes of low discharge superheat run time within 300
run hours. Refer to message "Warning – Low Discharge
Superheat Limit" for the low discharge superheat thresh-
old. The number of and total duration of low discharge
superheat events within the last 300 hours is displayed
on the COMPRESSOR screen (in SERVICE access
level) and print reports as "Low Discharge Superheat
Events" and "Low Discharge Superheat Run Time".
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