
SECTION 3 - DISPLAY MESSAGES
JOHNSON CONTROLS
193
FORM 160.54-O1
ISSUE DATE: 9/10/2014
3
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 than 180.0 PSIG (R134a)
•
more than 265.0 PSIG (R22).
The chiller can be started after the pressure decreases to:
•
less than 120.0 PSIG (R134a)
•
less than 205 PSIG (R22) and the Compressor
Switch is placed in the Stop-Reset (O) position
For special order R134a high condenser temperature
chiller applications, the Condenser Temperature Range
Setpoint (software version C.OPT.01.19.307 or later)
is set to Extended. The trip/reset threshold is then
200/140 PSIG.
Condenser – High Pressure – Stopped
(Software versions C.MLM.01.11.xxx and later or
C.OPT.01.11.303 and later) The condenser pressure
exceeded 160.0PSIG (R134a), 240.0 PSIG (R22) while
the chiller was stopped. High temperature condenser
water flowing through the condenser while the chiller
is shutdown can cause a condenser high pressure con-
dition resulting in loss of refrigerant. This safety fault
anticipates this problem by annunciating the condenser
high pressure condition. The chiller can be restarted af-
ter a Service Technician performs a special reset preset
procedure contained in
OptiView Control Center – Ser-
vice Instructions (Form 160.54-M1)
.
For special order R134a high condenser temperature
chiller applications, the Condenser Temperature Range
Setpoint (software version C.OPT.01.19.307 or later)
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 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 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 Compressor
Switch is placed in the Stop-Reset (O) position.
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 Compressor
Switch is placed in the Stop-Reset (O) position.
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 Compressor Switch is placed
in the Stop-Reset (O) position.
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 Compressor Switch
is placed in the Stop-Reset (O) position.
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