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Normal Mode Messages
The format of the message is mode and setpoint (see table 62).
Table 62. Possible MODE 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 oper
ations. This system status could be present with no active alarms, which usually indic
ates the alarm condition(s) are no longer present. If the system has cleared the alarm
there is usually a five minute delay before resuming system operations.
NOTE: Not all alarms will halt system operation. The first two active alarms are dis
played on the main system status screen (see figure 32).
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 [compres
sor] 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 > IN
STALL
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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