Instructions for
Installation, Operation,
Care and Maintenance
Note: N2-Blast
and Blast-off
®
Reliable Automatic Sprinkler Co., Inc., 103 Fairview Park Drive, Elmsford, New York 10523
are registered trademarks of South-Tek Systems, LLC.
®
Model DDX N2-Blast
Type D Preaction System
2" (50mm), 2-1/2" (65mm),
3" (80mm), 4"(100mm)
10 PSI (0.7 bar) Pneumatic
Supervising Pressure
Single Interlock - Electric Release
Double Interlock - Electric/Electric Release
General Description
The Reliable Model DDX PrePaK with integrated ni-
trogen generation is a completely self-contained, su-
pervised preaction system that can be readily installed
within a floor space of less than 7 ft
ing door swing). Installation of the PrePaK (not including
exterior devices, i.e., detectors and alarm bells) requires
three piping connections: the water supply, the sprinkler
system, and the drain. Reference locations of these pip-
ing connections are shown in Fig.1. Independent electri-
cal supplies are required for the optional system air compressor
(115 or 220 VAC), the optional Potter Model 4410 Releasing
Control Panel (115/220 VAC), and the nitrogen generator (115
VAC).
Full assembly drawings for the units are available on the
Reliable Automatic Sprinkler Company website (www.re-
liablesprinkler.com).
The Reliable Model DDX N2-Blast
a South-Tek Systems FPS-900 pressure swing adsorption
N2-Blast
nitrogen generator, complete with independent
®
air compressor, nitrogen storage tank, and control sys-
tem. The nitrogen generator is completely wired, tested,
and integrated with the Model DDX PrePak, and supplies
98% pure nitrogen to the piping network to limit electro-
chemical, galvanic, and micro-biologically influenced
corrosion (MIC). Operation and maintenance information
can be found in this bulletin as well as the South-Tek Sys-
tems website (www.southteksystems.com).
The Reliable Model DDX PrePaK utilizes an optional
Potter Model PFC-4410-RC Releasing Control Panel. This
fully programmable, microprocessor-based releasing
panel is Underwriters Laboratories, Inc. Listed and is in
compliance with NFPA 13 and NFPA 72. The PFC-4410-
RC is totally zone and output programmable such that
the Reliable Model DDX PrePaK can be utilized in many
different preaction applications without having to rewire
any of the factory installed devices. Once the previously
described connections are completed, the 24 VDC de-
tectors, output devices, and relay contacts may be con-
nected to achieve the desired system implementation.
Bulletin 735 April 2020
PrePaK
®
(0.65 m
) (not includ-
2
2
PrePak incorporates
®
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