Honeywell NOTIFIER UDS-3 User Manual, Installing And Operating Manual page 18

Release condition
UDS-3 enters this condition when it gets a signal from flowmeter input or after pre-release period (if
programmed).
In this state, UDS-3 activates extinguishing output and manages release cycle, checking flowmeter and
manostat input.
This condition is indicated by:

"Release in progress" led ON

Sound (if UDS-3 went into this state on flowmeter signal)

Sounder output activated, always ON

Extinguishing signal common output ON.

GAS label visualization on display's main screen with red backlight.

Indication on extinguishing information screen ("INFO", F2 and F3 function keys) that extinguishing
block has been activated
Extinguishing fault condition
This condition is generated when a fault happens on one of the controlled inputs/outputs associated to an
extinguishing zone.
Zone faults are generated by abnormal conditions on transmission supports or on extinguishing
management. In case of zone fault, signalling happens this way:

Buzzer activation

"Extinguishing fault" led ON

General fault output activation

Fault type indication on extinguishing information screen ("INFO", F2 and F3 function keys).

Transmission support faults are signalled by open circuit or short circuit faults and can block
extinguishing management. When manostat is active, without release condition active, UDS-3 enters
"Agent loss" fault condition and shows "Low Pressure" fault- In this condition "Extinguishing plant
Anomaly" output is activated. In case of activation with the above condition it will always be possible
to perform extinguishing cycle.
Only manual mode condition
This condition can be obtained through an activation command on the corresponding input on the terminal
board or programming with level 2 access.
In this condition UDS-3 manages only signal coming from manual activation input, other signals like pre-
activation/activation are ignored.
This mode is indicated by:

"Only Manual Mode" led ON

"Only Manual Mode" output activation;

Only manual mode indication on extinguishing information screen ("INFO", F2 and F3 function keys).
Out of order condition
This condition is reached when at least one exclusion is present in a zone. It is possible to exclude for each
zone, the following elements:

Manual activation input
(means that extinguishing phases' activation is only possible with signals coming from pre-alarm
and alarm signals or from loop, an activation signal on manual input is ignored, while possible
faults on transmission supports are signalled).

Pre-alarm output
(means that pre-alarm output is not activated in case of "pre-active" condition)

Directional valve output
(means that directional valve output is not activated in case of "active" condition)

Extinguishing output
In this case it's not possible to reach release phase from the following input devices:
PAGE - 17
NOTIFIER ITALIA
Installation and operating manual
Doc. M-205.1-UDS3N-ENG Rev A.1
UDS-3
UDS-3_manu