Table 9 - Safety Shutdown Messages - York OPTIVIEW Operation Manual

FORM 160.78-O2
ISSUE DATE: 5/22/2017

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
MESSAGE
AUXILIARY SAFETY –
CONTACTS CLOSED
CONDENSER – HIGH
PRESSURE
CONDENSER – HIGH
PRESSURE CONTACTS OPEN
CONDENSER – HIGH
PRESSURE – STOPPED
CONDENSER – PRESSURE
TRANSDUCER OUT OF RANGE
CONTROL PANEL – POWER
FAILURE
DISCHARGE – HIGH
TEMPERATURE
DISCHARGE – LOW
TEMPERATURE
JOHNSON CONTROLS
Manual (Form 160.78-M2) and YMC
Drive Service (Form 160.78-M3).
Service
2
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 defined safety shut-
down input. The chiller can be started after the contacts open and the CLEAR FAULT
key is pressed.
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.
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.
The condenser pressure exceeded 160.0PSIG (R134a) while the chiller was stopped.
High temperature condenser water flowing 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
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.
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 configuration. It indicates a cycling shutdown
when displayed in orange characters; Safety shutdown when displayed in red char-
acters. The control center is configured for auto-restart or manual restart after power
failure by a qualified Service Technician following instructions in YORK YMC
Manual (Form 160.78-M2).
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.
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.
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
DESCRIPTION
Service Manual (Form 160.78-M2).
2
Variable Speed
2
2
Service
2
125