5
4.0 MAINTENANCE
Fire and Insurance authorities recommend annual inspection and
if necessary, service of fire protection equipment. To insure proper
and reliable operation, we recommend the following inspection and
testing annually by a qualified technician:
1.
The detector head screen should be inspected for dust
accumulations and if excessive, contact your distributor or
factory for service.
2.
Activate a detector. Check that base lamp operates and
that proper fire indications are given by the system. An
ionization detector may be activated by blowing smoke
into the screened chamber or by holding a lighted match
a few inches below it.
3.
Check the supervisory circuit by operating the Reset
Switch to the reset position. In this position, the system
should give the required trouble indications.
4.
Check operation of each detector on circuit. Measure
sensitivityof each detector with appropriate sensitivity
checker.
5.0 TROUBLE SHOOTING THE SYSTEM
Perform checks in order following symptom noted. Refer to chart
for proper readings across specific terminals.
A trouble condition may result from any of the following conditions:
Open circuit detector lines
Input fuse open*
Loss of input supply*
Reset switch not in closed or normal position.
Alarm silence switch in off normal or silenced position during
non-alarm condition.
*Note items 2 and 3 above.
These conditions cause a change of state of the trouble relay
contacts only and not a visual trouble indication.
Trouble Condition (Trouble contacts in trouble state):
1. Check main power; terminals 1 (+) to 2 (-).
2. Check fuse F1.
3. Check detector circuit voltage: terminals 3 (+) to 4 (-).
Alarm Condition (alarm contacts in alarm state) without symptoms
of fire:
a.
Place Reset Switch in reset position and release.
b.
If voltage terminals 3 (+) 4 (-) is less than 20 VDC, check
current terminal 3. If an excess of Normal range then check
detector circuit for alarmed detector, correct end of line resistor,
or shorted lines.
VOLTAGE/CURRENT MEASUREMENT CHART
For DC voltage measurement on terminals noted in left hand
column, the positive terminal is listed first.
Terminals
Voltage
Current
Mode
3+ 4-
20-23 VDC
Normal
1
+
2-
42-55 VDC
Normal
3
14-20 mA DC
Normal
3
> 50 mA DC
Alarm
DETECTORS
May use up to 30 detectors
(selected from any of the
compatible detectors listed at
the right) or may use shorting
devices, detector relays, or
remote lamps (Refer to the
related detector instructions).
*CP-48 is the compatibility identifier.
DETECTOR
BASE
INSTALLATION/
COMPATIBILITY
COMPATIBILITY
WIRING
IDENTIFIER
IDENTIFIER
INSTRUCTIONS
DI-3
DB-3S
P/N 315-081943-15
DI-4A
DB-4
P/N 315-085257-11
PE-3
DB-3S
P/N 315-090875-6
COMPATIBLE DETECTORS*
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