System Maintenance And Testing - Siemens System 3 Manual

Section V — Detector Application and Spacing

5. SYSTEM MAINTENANCE AND TESTING

All fire detection systems should be
periodically tested in a manner that ensures
at least one annual check of all associated
detectors and devices. The most effective
way to perform this system test is to check
one-twelfth of the number of initiating
devices monthly. This results in an auto-
matic monthly test of the control panel,
alarm devices, and other associated
equipment.
More than just testing detectors for alarm
release, ionization and photoelectric-type
detectors should have their sensitivity
settings measured to assure a proper
range. All types of detectors should be
cleaned whenever there is evidence of dirt
or other contamination.
The System 3 Control Panel from Siemens
Industry, Inc. incorporates automatic
supervision of any open circuit or ground
fault in all external wiring. Either condition
results in a system audible and visual
trouble signal. Open circuits are further
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identified by the LED on either the zone or
the audible alarm module in which they
exist. A ground fault, in addition to initiating
a system trouble, identifies itself with its own
indicating LED. To locate and correct the
ground fault, each external circuit is system-
atically opened until the fault signal is
cleared. The ground is then found in that
particular circuit.
System 3 zone modules (ZU-35TSs) include
manual momentary contact zone alarm and
zone trouble test switches that simulate an
alarm or trouble condition when actuated.
However, this type of testing does not
assure proper detector performances and
does not serve that purpose.
For more detailed troubleshooting and
maintenance information, refer to the
System 3 Installation and Maintenance
Manual, P/N 315-085063. For service
assistance, call the Siemens Industry, Inc.
offices or Authorized Distributor listings
found in the Yellow Pages.