Table 92: Safety shutdown messages
Message Description
CONDENSER –
HIGH PRESSURE
– STOPPED
The condenser pressure exceeded 170 PSIG for shells with 235 PSIG DWP and
264 PSIG for shells with 350 PSIG DWP while the chiller was stopped. The control
determines the shell DWP by the condenser model number on the Sales Order
Screen. 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.
CONDENSER
– PRESSURE
TRANSDUCER
OUT OF RANGE
The Condenser Pressure Transducer is indicating a pressure that 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
- INVALID
BRAM
On bootup, the panel shall determine whether a 512K BRAM module is installed
by a sequence of tests where data is written and read from address above and
below 128K. IF the BRAM is not 512K, this shutdown is generated.
CONTROL
PANEL – LOSS
OF CONTROL
VOLTAGE
The line power input signal at I/O board TB3-81 was low for 1 second
continuous. This signal is used to determine when the digital inputs are affected
by a line power loss versus an actual condition for their devices. This fault is
not expected on an actual loss of microboard power from the critical load bus,
because the processor will be off before the fault delay. This message can
indicate a Cycling (auto-restart after power failure) or Safety (manual restart
after power failure) shutdown, depending upon control center configuration.
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
configuration. It indicates a cycling shutdown when displayed in orange
characters; Safety shutdown when displayed in red characters. The control
center is configured for auto-restart or manual restart after power failure by a
qualified service technician following instructions in YORK YMC
2
Service Manual
(Form 160.84-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 temperature 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.
YMC
2
Mod B with OptiView
™
Control Center
126
To Next Page
Loading...
