York YMC2 - TABLE 6 - Run Messages; TABLE 7 - MBC Startup Messages

JOHNSON CONTROLS
89
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
3
TABLE 6 - 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 Heatpump and the Control Mode is Cooling.
LEAVING CONDENSER LIQUID
CONTROL
The chiller is running, controlling the Leaving Condenser Liquid to the Leaving Con-
denser Liquid Temperature Setpoint. If the unit is a Heatpump and the Control Mode is
Heating.
LEAVING CHILLED & CON-
DENSER LIQUID CONTROL
The chiller is running, controlling the either Leaving Chilled Liquid or Leaving Condenser
Liquid Temperature. If the unit is a Heatpump and the Control Mode is Cooling & 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 VSD indicates a precharge or pre-
regulated state or DC Bus voltage >50v in the stopped state. A countdown timer shows
with this message to indicate the time remaining in a precharge or pre-regulate com-
mand 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 auto-
matically 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 mes-
sage 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.
TABLE 7 - MBC STARTUP MESSAGES
MESSAGE DESCRIPTION
WAITING FOR FLOW
The chilled liquid or condenser ow switch input is not reading voltage indicating no
presence of ow from the ow switch. Indication of ow is required during the MBC
Startup state to allow transition to chiller run.
WAITING FOR MBC
LEVITATION
The OptiView™ has issued a MBC Levitate command to the MBC and is waiting for
conrmation from the MBC that De-levitated mode is OFF, Levitated mode is ON, and
the input from the digital Rotation Allowed contacts on the MBC is high at OptiView™
I/O board terminal TB3-30. This message precedes “Waiting for Chilled Liquid Flow”.
WAITING FOR VSD
PREREGULATION
The OptiView™ has issued a VSD Pre-Charge/Pre-Regulate command to the VSD and
is waiting for conrmation from the VSD that it has achieved regulated DC Bus voltage
and is awaiting a run command. This message precedes “Waiting for MBC Levitation”.