Installation
3.5.2 Output Alarms
Output alarms are dry contract outputs from the ASMUC to a remote monitoring block/station. Consult the
ASMUC wiring diagram in Appendix B for wiring locations.
3.5.2.1 High/Low Temp Alarm
A high temp alarm will trigger when the indoor temperature has exceeded the high temperature setpoint for at
least 1 minute. The default high temp trigger is 18°F above the main setpoint and can be changed in the “Unit
Configuration I/O” menu under the Unit Config menu. A low temp alarm will trigger when the indoor temperature
has dropped below the low temperature alarm setpoint (default 32°F below setpoint). The default output setting
is Normally Closed (NC), which can be changed to Normally Open (NO) in the “Alarms” menu under the Control
Config Menu.
3.5.2.2 HVAC Fail Alarms
An HVAC alarm indicates one or more major alarms that will prevent a unit from Mechanical Cooling. This
includes:
• High and low refrigerant pressure (only affects mechanical cooling)
• Power loss
• Fan overload / airflow alarm
• Communication failure
• Failure of both indoor and backup indoor temperature sensors
The ASMUC.6 controller provides three dry contact outputs for HVAC fail alarms. If more connections are
needed, multiple HVAC alarms may be wired in series if NC or in parallel if NO.
Note: The negative leads must be landed on the alarm common (Terminal 47).
3.5.2.3 Dirty Filter Alarm Output
This alarm will trigger when the filter of any unit connected to the controller is dirty and needs replacement.
The alarm can be wired as either NO or NC. The default output setting is Normally Closed (NC), which can be
changed to Normally Open (NO) in the “Alarms” menu under the Control Config Menu.
3.5.3 Input Alarms
Input Alarms are used to inform the ASMUC of an alarm that is present in the building and make the ASMUC
behave accordingly. Note: all inputs must be dry contact signals.
Note: all inputs must be dry contact signals.
3.5.3.1 Smoke/Fire Alarm Input
This alarm input informs the controller that the smoke/fire detector has been triggered. All components will
immediately shut down and outside air damper will fully close until alarm condition is removed. The default
setting is Normally Closed (NC), which can be changed to Normally Open (NO) in the “Alarms” menu under
the Control Config Menu.
This alarm input must be wired to an isolated output or a relay. Piggybacking with other devices may cause a
false alarm.
Note: this is an input only and will not work as an output to a remote monitoring station.
3.5.3.2 Generator Run Input
This alarm input informs the controller that the generator is running. Outside air damper will fully close to
prevent diesel fumes from entering the building and only one HVAC will be permitted to run at a time to
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