Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

Page: 89 / 162

Table 85: Status messages
Message Description
SYSTEM READY TO START
The chiller is shut down but will initiate start upon receipt of a Local or Remote start signal.
The Magnetic Bearing Controller (MBC) does not have the driveline rotor levitated. The Hot
Gas Bypass Valve position (if present) is set to the programmed Hot Gas Startup Position.
The Level Control Valve position is set to the programmed Condenser Level Control Valve
Startup Position. The VGD driven to the programmed VGD Startup Position.
SYSTEM RUN The chiller is running under the condition described in the Details Line of the Status Bar.
SYSTEM STOPPED The chiller is shut down with a prevailing stop command.
Run messages
Table 86: Run messages
Message Description
LEAVING CHILLED LIQUID
CONTROL
The chiller is running, controlling the Leaving Chilled Liquid to the Leaving Chilled Liquid
Temperature Setpoint. Or if the unit is a heat pump and the Control Mode is Cooling.
LEAVING CONDENSER LIQUID
CONTROL
The chiller is running, controlling the Leaving Condenser Liquid to the Leaving Condenser
Liquid Temperature Setpoint. If the unit is a heat pump and the Control Mode is Heating.
LEAVING CHILLED &
CONDENSER LIQUID CONTROL
The chiller is running, controlling the either Leaving Chilled Liquid or Leaving Condenser
Liquid Temperature. If the unit is a heat pump and the Control Mode is Cooling and
Heating.
WARNING – VSD DC BUS
ACTIVE
This non-annunciating message alerts that the DC Bus is precharged or pre-regulated for
a state outside of chiller run. It is set when the variable speed drive indicates a precharge
or pre-regulated state or DC Bus voltage >50 V in the stopped state. A countdown timer
shows with this message to indicate the time remaining in a precharge or pre-regulate
command while stopped.
VSD – HIGH INPUT CURRENT
LIMIT
The Chiller Input current is greater than or equal to the Active Current Limit Setpoint. The
Current Limit Setpoint is programmed over a range of 30 to 100% of the Chiller Full Load
Amps (FLA). The Active limit is the minimum of the Local, pulldown (if active), and Remote
Current Limit Setpoints in Remote mode or the remote value in BAS (ISN) mode. While this
condition is in effect, chiller capacity control is in override to reduce current. Normal LCHLT
capacity control operation is resumed and this message automatically clears when the
input current decreases below this limit.
The highest of the three phase input currents divided by the programmed Job Input FLA is
compared to the limit for this override.
VSD – INPUT PULLDOWN
LIMIT
The chiller input current will be limited by the pulldown demand limit setpoint. The
message clears when the pulldown demand time expires.
SYSTEM RUN - ACTIVE
OPTIMIZER
The chiller is running, and the Optimizer is Active.
SYSTEM RUN - PASSIVE
OPTIMIZER
The chiller is running, and the Optimizer is Passive.
SYSTEM RUN - COOLING
The chiller is running, Heat Pump is Enabled and Control Mode is Cooling, Optimizer is
OFF.
SYSTEM RUN - HEATING The chiller is running, Heat Pump is Enabled and Control Mode is Heating.
SYSTEM RUN - COOLING and
HEATING
The chiller is running, Heat Pump is Enabled, Control Mode is Cooling, and Heating.
89 YVAM Control Center