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December 20, 2004 Chapter 1: Product Description
LTPH-UM-1261-01 1-7
In the HMU/HLU configuration, for example, for detailed information about the different types of alarms, refer to the
“Managing Alarms” section in the HMU-319, H2TU-C-319, or H4TU-C-319 User Manuals. Specifically, the manual
describes the types of alarms the HMU-319 reports, when the alarm occurs, and how to respond to the alarm using
the ACO.
Table 1-2. Alarms Wire-wrap Field Functional Description
Alarm Alarm Description Function
CRIT AUD Critical Audible There is a critical alarm active on the HMS-318
List 3 shelf. Connect this relay to the critical
alarm audible indicator of the CO alarm
system.
CRIT VIS Critical Visible There is a critical alarm active on the HMS-318
List 3 shelf. Connect this relay to the critical
alarm visual indicator of the CO alarm system.
MAJ AUD Major Audible There is a major alarm active on the HMS-318
List 3 shelf. Connect this relay to the major
alarm audible indicator of the CO alarm
system.
MAJ VIS Major Visible There is a major alarm active on the HMS-318
List 3 shelf. Connect this relay to the major
alarm visual indicator of the CO alarm system.
MIN AUD Minor Audible There is a minor alarm active on the HMS-318
List 3 shelf. Connect this relay to the minor
alarm audible indicator of the CO alarm
system.
MIN VIS Minor Visible There is a minor alarm active on the HMS-318
List 3 shelf. Connect this relay to the minor
alarm visual indicator of the CO alarm system.
SYS ID System ID There is a critical, major, or minor alarm active
on the HMS-318 List 3 shelf. Connect this relay
to the equipment rack alarm indicator.
ACO Alarm Cutoff External Alarm Cutoff (ACO) function silences
active audible alarms (see “Alarm Cutoff
(ACO)” on page 1-6).
GND Ground External ground
EXT TEMP External Temperature
Thermostat
Thermal control (digital temperature sensor).
Connect this pin to an external snap-action
thermostat to activate the fan relay. This
thermostat provides a switch closure to ground
that is sensed by the HMU-319.
NO COM FAN Fan Control The Fan Control manually disables a Fan
Assembly using the NO and COM fan control
contacts.