108
24.3.4. Normal Mode and Status Messages
The format of the message is mode and setpoint (see table 61).
Table 61. Possible Demand and Status Messages
COMP LOAD SHEDDING Unit is running at lower power capacity
COOLING Cool demand present; unit is in mechanical cooling.
DEHUMIDIFICATION Unit is dehumidifying
FREE COOLING Cooling demand is present, no compressor cooling.
FRESH AIR COOLING Cool ventilation air to neutral value
FRESH AIR HEATING Heat ventilation air to neutral value
HEATING Heat demand present; unit is heating
CONTROLLER LOCKOUT User has disabled controller operation.
LOW AMBIENT LOCKOUT Outdoor air is too cold to allow compressors to run.
MORNING WARMUP Outdoor air damper closed
OFF ON ALARM
Unit is off due presence of alarm(s) that the system has determined will halt system operations.
NOTE: Not all alarms will halt system operation. The first two active alarms are displayed on the main system
status screen.
DELAY UP TO 5 MIN If the system has cleared the alarm there is usually a five minute delay before resuming system operations.
DELAY UP TO 20 SEC In certain models, the compressor turns on a few seconds after the outdoor fan is energized.
PRE-COOL
Compressor not allowed—free cooling. (During the first 30 minutes of the first cooling demand following a
change from unoccupied to occupied, calls for mechanical [compressor] cooling are ignored if an economizer is
installed and if outdoor air is suitable for free cooling.)
PREINSTALL Unit has not been set up for operation. Must follow installation menus
START UP Default start up delay before servicing demands. Go to M3 user interface: SETUP > INSTALL
SMOKE ALARM Smoke input detected
TEST Network has unit in test mode
BLOWER ON Indoor blower is on.
BLOWER ON - OAS Indoor blower is on and outdoor air is suitable.
NO DEMAND System not receiving a demand for cooling or heating.
NO DEMAND - OAS System not receiving a demand for cooling or heating and outdoor air is suitable.
COOL + MAX OPEN ECON Mechanical cooling is operating with maximum free cooling.
COOL + MODULATE ECON Mechanical cooling is operating with variable free cooling.
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