York YK Style H Operation Manual page 181

FORM 160.76-O2
issue date: 6/15/2015
Condenser – High Pressure Contacts Open
The contacts of the electro-mechanical high pressure
safety switch have opened because this device has de-
tected a high pressure:
• more than 204 PSIG (R134a)
The contacts will automatically close when the con-
denser pressure decreases to:
• less than 160 PSIG (R134a)
The chiller can be started after the contacts close and
the Clear Fault key is pressed on the display.
Condenser – High Pressure
The condenser pressure, as sensed by the Condenser
transducer, has increased to:
• more than 180.0 PSIG (R134a)
The chiller can be started after the pressure decreases to:
• less than 120.0 PSIG (R134a) and the Clear Fault
is pressed on the display.
For special order R134a high condenser temperature
chiller applications, the Condenser Temperature Range
Setpoint is set to Extended. The trip/reset threshold is
then 200/140 PSIG.
Condenser – High Pressure – Stopped
The condenser pressure exceeded 160.0PSIG (R134a),
while the chiller was stopped. High temperature con-
denser water flowing through the condenser while the
chiller is shutdown can cause a condenser high pres-
sure 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 spe-
cial reset preset procedure contained in OptiView Con-
trol Center – Service Instructions (Form 160.76-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)
• or more than 300.0 PSIG R134a
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
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 Clear Fault key is pressed on the display.
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 Clear Fault key is pressed on
the display.
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 Clear Fault
key is pressed on the display.
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 temperature
increases to greater than 30.0°F and the Clear Fault key
is pressed on the display.
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 Clear Fault key is pressed on
the display.
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 Clear Fault key is
pressed on the display.
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