Rev 3.1 01/11/23 - 21 - Model 600 User Guide
will clear when the controlling temperature is below the high temp L1 setpoint minus 2 degrees for 1
minute. Alarm Output 3 is used for High Temp Level 1 alarms along with an alarm message on the front
display and status via Modbus.
5.3 Low Temperature
The Model 600 Controller will compare the controlling temperature to the low temperature alarm
setpoint and alarm if the controlling temperature is less than the setpoint for one minute. The alarm
will clear when the controlling temperature is above the low temp setpoint plus 2 degrees for 1 minute.
Alarm Output 4 is used for Low temp along with an alarm message on the front display and status via
Modbus.
5.4 High Humidity Alarm
The Model 600 Controller will compare the humidity sensor reading to the High Humidity alarm setpoint
and alarm if the humidity is greater than the setpoint for one minute. The alarm will clear when the
humidity is below the humidity alarm setpoint minus 5 (%rh) for 1 minute. This alarm condition will
display on the front panel as well as have a Modbus register indicating an alarm.
5.5 HVAC Lockout
The Model 600 Controller will monitor the lockout alarm input based on the system configuration for
both HVAC units. The system will enter the HVAC lockout alarm mode when the input is active for 5
seconds on either HVAC unit. When this input is active, the controller will turn off the mechanical
cooling of the affected unit. In addition, if the affected unit is the lead, the Model 600 will switch the
lead unit. Alarm Output 1 is used to indicate a control voltage alarm has occurred on either unit along
with an alarm message on the front display and status via Modbus.
If both HVAC units are in lockout then the controller will turn on the Emergency Vent output(s) of each
HVAC unit, along with the supply fan(s) to initiate emergency vent mode.
5.6 HVAC Control Voltage Lost
The Model 600 Controller will monitor the 24VAC control voltage for both HVAC units. The system will
enter the Control Voltage Lost alarm mode when the voltage is not present for 5 seconds on either
HVAC unit. When this input is active, the controller will turn off the mechanical cooling of the affected
unit. In addition, if the affected unit is the lead, the Model 600 will switch the lead unit. Alarm Output 6
is used to indicate a control voltage alarm has occurred on either unit along with an alarm message on
the front display and status via Modbus.
5.7 Smoke Alarm
The system will enter smoke alarm mode when the input is active for 5 seconds. When this input is
active, the controller will do the action defined under the system program menu which is to disable econ
mode only on both units or to turn off both HVAC units completely. Alarm Output 5 will be used to
indicate a smoke alarm along with an alarm message on the front display and status via Modbus.
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