Johnson Controls YORK YMC2 Operation And Maintenance Manual

Table 97: Warning messages
Message Description
WARNING – CONDENSER
OR EVAPORATOR XDCR
ERROR
The Evaporator pressure Transducer is indicating a higher pressure
than the Condenser pressure Transducer after the chiller has been
running for 10 minutes. This is indicative of a Condenser or Evaporator
Transducer failure. This message will be displayed until the condition
clears and the warning reset keypad button is pressed in operator (or
higher) access mode. Condition not checked in Brine mode.
WARNING – CONDENSER
OR VGD SENSOR
FAILURE
The difference between the Discharge Pressure Transducer output
and the Condenser Pressure Transducer output has exceeded 21 psid
for 3 continuous minutes while the chiller was running. This feature
verifies the operation of the transducers. Because both transducers
are measuring essentially the same pressure, both outputs should
be within the specified tolerance. This message must be manually
cleared. It will be displayed until the transducer outputs are within the
acceptable range of each other and the warning reset button in service
access level.
WARNING –
EVAPORATOR – LOW
PRESSURE LIMIT
The Evaporator pressure has decreased to the warning threshold.
This threshold is fixed in water cooling applications. In Brine cooling
applications, the threshold is a fixed amount above the programmable
safety shutdown threshold. The Safety threshold in Brine applications
is determined by the Brine solution and is determined by the YORK
Factory.
Warning threshold (psig) Reset threshold (psig)
Water Brine Water Brine
27.0 +2.0>Safety Setpoint 28.0 +3.0>Safety Setpoint
While this condition is in effect, the chiller capacity control is in override
to increase suction pressure. This message automatically clears and
normal LCHLT capacity control restored when the Evaporator pressure
increases to the reset value.
WARNING – EXCESS
SURGE DETECTED
This warning applies only if Surge Protection shutdown feature is
disabled. The Surge Window Count has exceeded the Count Limit.
Message can be manually cleared after the Surge Window Count is less
than or equal to the Count Limit, or the shutdown feature is Enabled
or the chiller is stopped. To clear message press warning reset key on
home screen when logged in at operator (or higher) access level.
WARNING - LIQUID
LEVEL SETPOINT NOT
ACHIEVED
The chiller is running and Refrigerant Level > (Refrigerant Level setpoint
+15%) or Refrigerant Level < (Refrigerant Level setpoint -15%) for 10
continuous minutes. The Warning is bypassed for the first 30 minutes
of run to allow stabile operation to establish. It is released when the
chiller is not running or Refrigerant Level is within setpoint ±15%. The
message clears automatically.
YMC
2
Mod B with OptiView Control Center
98

Johnson Controls YORK YMC2 Specifications

General

Brand	Johnson Controls
Model	YORK YMC2
Category	Chiller
Language	English