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Senju Sprinkler ZN-UF Operation Instructions Manual

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G E N E R A L D E S C R I P T I O N
The Model ZN-UF Flush Pendent Sprinklers are automatic sprinklers of the compressed fusible solder type. They are
decorative, low profile, flush mount sprinklers. The Frame and Heat Collector of the sprinkler hide the Deflector and Gasket
assemblies. (Reference Figure 1) The Model ZN-UF is designed for use in Commercial occupancies. When aesthetics is
the major consideration, the Model ZN-UF should be your first choice.
They are to be used in wet pipe sprinkler systems per NFPA 13.
The Model ZN-UF has a 5.6 (80.6) K-factor. The Flush design of the Model ZN-UF features a separable escutcheon
providing 3/8 inch (9.5 mm) vertical adjustment. This adjustment reduces the accuracy to which the fixed pipe drops to
the sprinklers must be cut to help assure a perfect fit installation.
The Model ZN-UF has been designed with heat sensitivity (Standard Response) and water distribution characteristics
proven to help in the control of fires to improve the chance for occupants to escape or be evacuated. However, fire
sprinkler systems are not a substitute for intelligent fire safety awareness or fire safety construction required by building
codes.
WA R N I N G S
The Model ZN-UF Commercial Flush Pendent Sprinklers described herein must be installed and maintained in
compliance with this document, as well as with the applicable standards of the National Fire Protection Association,
in addition to the standards of any other authorities having jurisdiction. Failure to do so may impair the integrity of
these devices.
Because of the above cited stipulations and the varied nature of architecture, there will be some compartment designs
which cannot be fully sprinklered in accordance with the recommendations of NFPA 13. In the event of this condition,
consult the authorities having jurisdiction for guidance and approval.
www.senjusprinkler.com
Model ZN-UF
K-Factor: 5.6
•
Flush Pendent Sprinkler
Standard Response, Standard Coverage
Page 1 of 6
SIN: SS2531
Document No. U01317B • 01-06-2022

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Summary of Contents for Senju Sprinkler ZN-UF

  • Page 1 They are to be used in wet pipe sprinkler systems per NFPA 13. The Model ZN-UF has a 5.6 (80.6) K-factor. The Flush design of the Model ZN-UF features a separable escutcheon providing 3/8 inch (9.5 mm) vertical adjustment. This adjustment reduces the accuracy to which the fixed pipe drops to the sprinklers must be cut to help assure a perfect fit installation.

  • Page 2: Technical Data

    Sprinkler and Eschutcheon: White Painted, Black FM Mark Painted, Chrome Plated • Physical Characteristics: Dezincification resistant Figure 1: Model ZN-UF, K = 5.6 Flush Pendent Sprinkler bronze body and copper gasketed orifice seal (Metal Sealing) design O P E R AT I O N The Sprinkler assembly contains a small fusible solder element.

  • Page 3: D E S I G N C R I T E R I A

    Use only the escutcheon provided with the Model ZN-UF. 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.

  • Page 4: Installation Steps

    Use only VC-H model wrench socket for installation of ZN-UF sprinklers. Use of any other wrench or socket is prohibited and may cause damage to the sprinkler.
  • Page 5 Step 4: Wrench tighten the Sprinkler using only the Socket Wrenching Area VC-H or Ratchet (3/8″ drive) & Socket VC-H Combination (Ref. Figure 4). The wrench recess of the Socket is to be applied to the sprinkler wrenching area (Ref. Figure 4). Protective Cap Socket VC-H Step 5: Use the “tolerance limit of ceiling level”...

  • Page 6: Tools And Accessories

    C A R E & M A I N T E N A N C E The following instructions must be implemented for the maintenance and service of the Model ZN-UF. Notes Wet pipe sprinkler systems must be maintained at a minimum temperature of 40°F / 4°C to prevent freezing and bursting of the pipe and/or sprinklers.

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Ss2531

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