York YK-EP B Operation & Maintenance Manual page 177

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
OptiView Control Center – Service Instructions (Form
160.54-M1).
For special order R134a high condenser temperature
chiller applications, the Condenser Temperature Range
Setpoint is set to Extended. The trip/reset is then
170/170 PSIG .
Condenser – Pressure Transducer Out Of
Range
The Condenser Pressure transducer is indicating a
pressure that is:
• less than 6.8 PSIG (R134a)
• less than 24.2 PSIG (R22)
• or more than 300.0 PSIG (R134a or R22)
This is outside the normal operating range of the
transducer. This is generally indicates a defective
transducer. The chiller can be started after the trans-
ducer is indicating a pressure that is within range and
the Operator presses the WARNING RESET button.
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 Operator presses the WARN-
ING RESET button.
Discharge – High Temperature
The discharge temperature, as sensed by the Discharge
Temperature Transmitter, has increased to greater than
220.0°F. The chiller can be started after the tempera-
ture decreases to less than 220.0°F and the Operator
presses the WARNING RESET button.
Discharge – Low Temperature
The discharge temperature, as sensed by the Discharge
Temperature Transmitter, has decreased to less than
30.0°F. The chiller can be started after the tempera-
ture increases to greater than 30.0°F and the Operator
presses the WARNING RESET button.
Oil – High Temperature
The oil temperature, as sensed by the Oil Temperature
Transmitter, has increased to greater than 180.0°F. The
chiller can be started after the temperature decreases to
less than 180.0°F and the Operator presses the WARN-
ING RESET button.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
Oil – Low Differential Pressure
The differential oil pressure decreased to less than
15.0 PSID while the chiller was running or failed to
achieve 25.0 PSID by the last 5 seconds of the System
Prelube period. The differential oil pressure is the dif-
ference between the output of the Sump Oil Pressure
transducer (system low pressure) and the output of the
Pump Oil Pressure transducer (system high pressure).
The chiller can be started after the Operator presses the
WARNING RESET button.
Oil – High Differential Pressure
The differential oil pressure increased to greater than
120 while the oil pump was running. The differential
oil pressure is the difference between the output of the
Sump Oil Pressure transducer (system low pressure)
and the output of the Pump Oil Pressure transducer
(system high pressure). The chiller can be started after
the differential oil pressure decreases to less than 90.0
PSID and the Operator presses the WARNING RESET
button.
Oil – Pump Pressure Transducer Out Of Range
The Pump Oil Pressure transducer (system high pres-
sure) is indicating a pressure that is less than 0.0 PSIG
or greater than 315.0 PSIG. This is outside the normal
operating range of the transducer. This generally indi-
cates a defective transducer. The chiller can be start-
ed after the transducer is indicating a pressure that is
within range and the Operator presses the WARNING
RESET button.
Oil – Sump Pressure Transducer Out Of Range
The Sump Oil Pressure transducer (system low pres-
sure) is indicating a pressure that is outside the normal
operating range of the transducer as follows:
• R134a is less than 0.0 PSIG or more than 315.0
PSIG.
• R22 is less than 23.2 PSIG or more than 271.8
PSIG.
This generally indicates a defective transducer. The
chiller can be started after the transducer is indicating
a pressure that is within range and the Operator presses
the WARNING RESET button.
Oil – Differential Pressure Calibration
The Sump and Pump oil pressure transducers indicated
a differential oil pressure of greater than 15.0 PSID
during the oil pressure transducer Auto-Zeroing period
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