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YORK INTERNATIONAL
106
FORM 160.55-O1 (604)
Enabled by a Service Technician (fol low ing in struc tions
in Service Manual 160.55-M1) and the Leaving Chilled
Liquid temperature Setpoint is <38.0°F.
“EVAPORATOR – TRANSDUCER OR LEAV ING
LIQUID PROBE”
A possible defective Evaporator pressure Transducer
or Leaving Chilled Liquid temperature Thermistor has
been detected. The pressure and temperature that these
devices are indicating are not in the correct re la tion ship
to each other. The OptiView Control Center con verts the
evap o ra tor pressure to a Saturated Tem per a ture value
and compares this value to the Leaving Chilled Liquid
tem per a ture (difference = chilled liquid temp – evap o -
ra tor saturated temp). The difference should not be out-
side the range of –2.5°F to +25.0°F. If the Transducer
and Thermistor are accurate, the Evap o ra tor Saturated
tem per a ture should not be > 2.5°F warm er nor > 25.0°F
colder than the leaving chilled liq uid temperature. In or-
der to initiate a shutdown, the dif fer ence must be out side
the acceptable range con tin u ous ly for 10 minutes. For
Steam Turbine drive ap pli ca tions, this check is by passed
for the Þ rst 20 min utes of chiller operation. The chiller
can be started af ter the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
“EVAPORATOR – TRANSDUCER OR
TEMPERATURE SENSOR”
A possible defective Evaporator pressure Transducer
or Refrigerant Temperature Sensor has been detected.
The OptiView Control Center converts the evaporator
pressure to a Saturated Temperature value and com-
pares this value to the optional Evaporator Refrigerant
Tem per a ture Sensor. If the difference between these
tem per a tures 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 in struc tions
in YORK Service Manual 160.55.M1
• Not in Brine cooling mode
• Smart Freeze is enabled (Flash Memory Card ver-
sion C.MLM.02.02.xxx and later)
• Evaporator Temperature Sensor (RT7) or Evap o -
ra tor Saturation Temperature is indicating a tem-
per a ture of <32.0ºF (Flash Memory Card version
C.MLM.02.02.xxx and later)
The chill er can be start ed af ter the tem per a tures are
within 3.0°F of one another and the COM PRES SOR
switch is placed in the Stop-re set (O) po si tion.
“CONDENSER – HIGH PRES SURE
CONTACTS OPEN”
The contacts of the electro-mechanical high pressure
safety device, located on the condenser shell, have
opened be cause this device has detected a pressure >
29.7 PSIA. The contacts will automatically close when
the con dens er pressure de creas es to < 23.7 PSIA. The
chill er can be started after the contacts close and the
COM PRES SOR switch is placed in the Stop-Re set
(O) po si tion.
“CONDENSER – HIGH PRESSURE”
The condenser pressure, as sensed by the Condenser
Transducer, has increased to >29.7 PSIA. The chiller
can be start ed after the pressure decreases to <23.7 PSIA
and the COM PRES SOR switch is placed in the Stop-
Reset (O) position.
“CONDENSER – HIGH PRESSURE –
STOPPED”
(Software versions C.MLM.02.06.xxx and later or
C.OPT.02.06.303 and later)
The condenser pressure exceeded 26.7 PSIA while the
chiller was stopped. High temperature condenser water
ß owing through the condenser while the chiller is shut-
down can cause a condenser high pressure condition
resulting in loss of refrigerant. This safety fault antici-
pates this problem by annunciating the condenser high
pressure condition. The chiller can be restarted after a
Service Technician performs a special reset preset proce-
dure contained in YORK Service Manual 160.55-M1.
“CONDENSER – PRESSURE TRANSDUCER OUT
OF RANGE”
The Condenser Pressure Transducer is indicating a
pres sure that is >35.3 PSIA. This is outside the nor mal
op er at ing range of the trans duc er. This is generally in-
di cates a defective trans duc er. The chiller can be start ed
after the transducer is in di cat ing a pressure that is <
35.3
PSIA and the COM PRES SOR switch is placed in the
Stop-Reset (O) po si tion.
“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 deÞ ned
safe ty shutdown input. The chiller can be started after
the con tacts open and the COM PRES SOR switch is
placed in the Stop-Reset (O) position.
OptiView Control Center