Siemens System 3 Manual page 11

Section III — Equipment Descriptions and Functions
ZU-35TS ZONE MODULE
This module includes two detection zones
with alarm and trouble LEDs, test switches,
and output terminals to activate other
appropriate modules or remote annuncia-
tors. It can accommodate up to thirty
ionization, photoelectric, or flame detectors,
or a combination thereof. The number of
thermal
detectors, manual stations, and other
approved contact devices that can be wired
on a single zone are under practical limita-
tions only. (See Spec Sheet Catalog No.
3107.)
ZS-30 INTRINSICALLY SAFE ZONE
MODULE (See NOTE on page 15.)
This module allows certain ionization
detectors, thermal detectors, and manual
stations of the non-explosionproof type to
be installed in hazardous areas classified
as Class I, Division I, Groups A, B, C, and
D. A diode shunt barrier is required outside
the hazard area to limit the energy in the
event of equipment failure. Only ten Model
DI-3IS Ionization Detectors or five Model
S-121/122 Flame Detectors, and any
number of approved thermal detectors or
manual stations, can be connected to this
single zone module. (See Spec Sheet
Catalog No. 3105.)
Note: Unlike the ZU-35TS, this single
zone module does not have its
own zone alarm and trouble test
switches. Therefore, it is
necessary to use an SM-30 switch
module alongside the ZS-30 to
satisfy this test capability
requirement.
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RC-30U CONFIRMATION MODULE
This module is designed to reduce unwanted
alarms from the momentary presence of
products of combustion — low ceiling heights
where smoking is allowed, for example. It
records the first alarm from zones under its
control, but does not put the control panel into
the alarm mode unless the detector response is
repeated within 1 minute (time adjustable) or
less. (See Spec Sheet Catalog No. 3167.)
AE-30U ALARM EXTENDER MODULE
This module is used whenever the total alarm
device power exceeds the supervised 1.5A alarm
circuit that is included in the CP-35, or where
separate alarm circuits are required. Each
AE-30U offers another supervised 1.5A, and
AE-30U modules can be used in whatever
multiples are required. (See Spec Sheet
Catalog No. 3129.)
MC-30 MASTER CODE MODULE
This module is designed to provide a pulse
(120/minute) on the audible and visible signal
devices. It is capable of controlling up to three
audible signal circuit AE-30U modules. (See
Spec Sheet Catalog No. 3163.)
ZN-31U CONTACT MODULE
See Spec Sheet Catalog No. 3108.
ZN-34UA, ZN-34US INPUT MODULES
These modules are designed to provide two
circuits for the supervision of sprinkler system
gate valves and ancillary equipment in accor-
dance with NFPA Standard 72. The modules
provide two yellow LED indicators per circuit. The
first illuminates when a supervisory condition
exists and the second when a circuit trouble
condition occurs. The module utilizes an end-of-
line resistor in parallel with normally open
switches to provide this supervision. (See Spec
Sheet Catalog No. 3111.)