York OPTIVIEW - Safety Shutdown Messages; General Safety Shutdowns

JOHNSON CONTROLS
125
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
FORM 160.78-O2
ISSUE DATE: 5/22/2017
2
TABLE 9 - SAFETY SHUTDOWN MESSAGES
The chiller can be started after manual resets are per-
formed as detailed below. Service and troubleshooting
information is contained in the YORK YMC
2
Service
MESSAGE DESCRIPTION
AUXILIARY SAFETY –
CONTACTS CLOSED
The Auxiliary Safety shutdown input, connected to I/O Board TB4-31 senses 115 VAC,
initiating a safety shutdown. This input is a general-purpose, user dened safety shut-
down input. The chiller can be started after the contacts open and the CLEAR FAULT
key is pressed.
CONDENSER – HIGH
PRESSURE
The condenser pressure, as sensed by the Condenser Transducer, has increased to is
greater than 180.0 PSIG (R134a). The chiller can be started after the pressure decreas-
es to is less than 120.0 PSIG (R134a) and the CLEAR FAULT key is pressed.
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 greater
than 204±7 PSIG. The contacts will automatically close when the condenser pressure
decreases to is less than 160±10 PSIG. The chiller can be started after the contacts
close and the CLEAR FAULT key is pressed.
CONDENSER – HIGH
PRESSURE – STOPPED
The condenser pressure exceeded 160.0PSIG (R134a) while the chiller was stopped.
High temperature condenser water owing 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 YORK YMC
2
Service Manual (Form 160.78-M2).
CONDENSER – PRESSURE
TRANSDUCER OUT OF RANGE
The Condenser Pressure Transducer is indicating a pressure that is is less than 6.8
PSIG or greater than 300.0 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 pressure that is within range and the CLEAR FAULT
key is pressed.
CONTROL PANEL – POWER
FAILURE
A Control Power failure has occurred. If the power failure occurred while the chiller was
running, it will automatically restart when power is restored. This message can indicate
a Cycling (auto-restart after power failure) or Safety (manual restart after power failure)
shutdown, depending upon control center conguration. It indicates a cycling shutdown
when displayed in orange characters; Safety shutdown when displayed in red char-
acters. The control center is congured for auto-restart or manual restart after power
failure by a qualied Service Technician following instructions in YORK YMC
2
Service
Manual (Form 160.78-M2).
DISCHARGE – HIGH
TEMPERATURE
The discharge temperature, as sensed by the Discharge Temperature Thermistor, has
increased to greater than 220.0°F (104°C). The chiller can be started after the tempera-
ture decreases to less than 220.0°F (104°C) and the CLEAR FAULT key is pressed.
DISCHARGE – LOW
TEMPERATURE
The discharge temperature, as sensed by the Discharge Temperature Thermistor, has
decreased to less than 30.0°F (-1.1°C). The chiller can be started after the temperature
increases to greater than 30.0°F (-1.1°C) and the CLEAR FAULT key is pressed.
Manual (Form 160.78-M2) and YMC
2
Variable Speed
Drive Service (Form 160.78-M3).