www.senjusprinkler.com
Document No.U029423 • 01-06-2022
Page 3 of 6
The Model ZN-QR Flush Pendent Sprinklers must only be installed and utilized in accordance with the following described
criteria, which are provided by the manufacturer.
D E S I G N C R I T E R I A
Notes
Fire Sprinkler Systems should only be designed and installed by those component and completely familiar with automatic
sprinkler system design, installation procedures, and techniques.
The Model ZN-QR Flush Pendent Sprinklers are intended for fire protection systems designed in accordance with the standard
installation rules recognized by the applicable Listing or Approval agency (e.g., UL Listing is based on NFPA 13 requirements).
Several criteria may apply to the installation and usage of each sprinkler. Consequently, it is recommended that the sprinkler
system designer review and develop a working understanding of the complete list of criteria prior to initiating the design of the
sprinkler system.
Questions concerning sprinkler installation and usage criteria, which are not covered by the following instructions, should be
submitted to your contracted company. Include sketches and technical details, as appropriate.
In some instances, the requirements of this document may concern specifications which are more stringent and which take
precedence over those specified in NFPA 13 or by the authority having jurisdiction.
The spray from the sprinkler is distributed radially outward and downward from the sprinkler deflector. Consequently, the
sprinklers must be located such that there will not be any blind spaces shielded from spray by partitions, room dividers,
overhangs or other parts of the dwelling structure.
The number of sprinklers within each compartment (as defined by NFPA 13) must be kept as few as possible while observing
all guidelines relating to obstructions and spacing.
Use only the escutcheon provided with the Model ZN-QR. The sprinkler must be secured in position by firmly fastening the
sprinkler system piping to the structure. If the sprinkler is not properly secured in position, reaction forces resulting from
sprinkler operation could alter its orientation and its water distribution pattern.
The sprinkler escutcheon cannot be used to hold the sprinkler in position.
The Model ZN-QR must only be utilized in wet pipe sprinkler systems.
Obstruction to Water Distribution
Locations of sprinklers must follow the obstruction rues of NFPA 13.
Precautionary Warnings for Corrosive Environments
Model ZN-QR sprinklers should not be installed where they may be subjected to a corrosive environment including the
following:
1. Chlorine ion and Chloride environment
Stress corrosion cracking may be caused by exposure to environments with Chlorine ion and Chloride. Exposure to
this environment may result in sprinklers operating under non-fire conditions or not operating when exposed to an
actual fire.
2. Sprinkler system piping with Copper
Sprinkler systems should be constructed in compliance with the applicable standards and the requirements for
copper piping when copper piping is used in the sprinkler system. (Reference standards NFPA 13, ASTM B813, ASTM
B828, and CDA (Copper Development Association) – Solder Joint)
All residual flux must be removed from the interior and exterior of the copper piping by thoroughly flushing before
installation of the Sprinkler Heads. Otherwise, residues of flux may cause corrosion and/or leakage in the sprinkler
system.
