11
LW-401 Operation, Installation, and Maintenance Manual
LW-401
Zone operation are described below.
• Shorting-type input devices and smoke
detectors are compatible with all zone
types.
• Manual fire alarm stations and smoke
detectors can be mixed on zones where
local codes allow.
• On verified zones, the manual station
reports alarms when activated, without
delay.
Alarm Verification
The Alarm Verification Feature provides the
LW-401 with a way to verify an alarm from
area-type smoke detectors. This feature can
be used to reduce incidences of false
alarms.
A detector supervised with Alarm Verification
is turned off by the System immediately after
it reaches an alarm threshold. The trouble
LED for that detector's zone turns on. The
detector is verified for a length of time which
must not exceed 60 seconds. After power is
restored to the device, and for the next 60
seconds, if the detector once again reaches
the alarm threshold the system will report an
alarm condition. If after 60 seconds the
detector has not alarmed, any detector which
again reaches the alarm threshold will restart
the verification cycle. See Figure 7, page 12,
for a graphic illustration of the Alarm Verifica-
tion Time cycle.
CAUTION:
Use only detectors which are subjected to
air velocities of less than 100 feet per
minute with Alarm Verification. Under dy-
namic air velocity conditions, smoke may
be swept from a smoke detector after the
initial alarm. That may cause a long delay
before verification. Do not select Alarm
Verification for such applications.
display. If an alarm occurs after the trouble is
annunciated, the 7-segment display will clear.
To Acknowledge Troubles
1. Unlock and open the door.
2. Press ACK to acknowledge (Block
Acknowledge) all troubles and other
conditions. The system TROUBLE LED
and the Zone TROUBLE LEDs on the
front panel stop flashing and remain on.
The system’s internal audible silences.
To Reset
Press RESET. (The system will not reset
until all alarms, supervisories, and troubles
are acknowledged and all conditions are
returned to normal.)
System Features
In addition to the standard modes of opera-
tion for reporting system conditions, the
LW-401 has user-programmable features
that are described below. Each topic identi-
fies the Program Level used to select these
features. Refer to the Programming section
of this manual for instructions on how to
activate these features in your LW-401
System.
Initiating Device Circuit (Zone) Types
(Program Level 3)
The LW-401 has the following 4 zone types.
• General Alarm
• Alarm Verified Zones
• Supervisory Zones
• Generic Zones
General Alarm is the default setting for all
zones. Alarm Verified Zone and Generic
