Technical data

34.
The alarm continues to sound as long as pressurized water is in the sprinkler system and will stop when
the main water supply control valve is closed. The water motor alarm may be temporarily silenced by
closing the alarm control valve located in the trim of the Model DDX Deluge Valve. Model C Mechani-
cal Alarms are self resetting after each operation, eliminating the need of removing cover plates, etc.
to reset internal mechanisms.
Approvals and technical data for the Reliable Model C Mechanical Alarm can be found on Reliable
Automatic Sprinkler Company Bulletins 612 and 613.
2.7.2 EPS10 Pressure Switch
Pressure activated switches are used to control the operation of fire alarm devices, trouble annunciat-
ing devices, and electrical equipment (such as, computer systems and HVAC systems) when water
flows from a primary control valve into a sprinkler system. The System Sensor Model EPS10 switch is
designed for use in automatic sprinkler systems to indicate a discharge from a sprinkler (water flow
alarm). The Model EPS10-1 has a single SPDT switch and the Model EPS10-2 has two SPDT switches.
The pressure switch can be connected directly (or indirectly via an alarm panel) to an electric bell,
horn, horn/strobe or other alarm. The EPS-10 Series features field adjustable pressure sensitivity to
provide alarm response between 4 and 20 psi (0.3 and 1.4 bar) on rising pressure. It is factory set to
respond at 4 (0.3) to 8 psi (0.3 – 0.55 bar) on rising pressure. The pressure adjustment wheel requires
no special tools. Please reference System Sensor Data Sheet A05-0176 for further information on the
EPS10 Series
2.7.3 Electric Bell
The high reliability and low power requirement of electric
bells such as the System Sensor Model SSM (24 VDC)
and SSV (120 VAC) Series makes them suitable for most
fire alarm applications. These devices are typically rated
for continuous operation and may be used in many differ-
ent applications. Electric bells are available in various sizes
and finishes, and can be used for indoor or outdoor ap-
plications. Electric bells can be operated directly from an
alarm pressure switch such as the System Sensor Model
EPS10 pressure switch, or indirectly via a listed alarm pan-
el. Please reference System Sensor Data Sheet A05-260 for
further information on electric bells.
3. ORDERING GUIDE
The following form is provided for your use in ordering Special Systems built around the Reliable Automatic Sprin-
kler Company DDX valve. (Please note that this form is not applicable for 1½” Model H systems and/or PrePak
systems.) If additional information is needed, or should you need assistance in filling out the form prior to contact-
ing your regional sales office, please contact the Technical Services Department at 1-800-557-2726, or by email at
[e-mail].
Figure 40