Senju Sprinkler ZN-QR User manual

www.senjusprinkler.com Document No.U029423 • 01-06-2022
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The Model ZN-QR Flush Pendent Sprinklers are automatic sprinklers of the compressed fusible solder type. They are
decorative, low prole, ush mount sprinklers. The Frame and Cover of the sprinkler hide the Deector and Valve Cap
assemblies. (Reference Figure 1) The Model ZN-QR is designed for use in Commercial occupancies. When aesthetics is
the major consideration, the Model ZN-QR should be your rst choice.
They are to be used in wet pipe sprinkler systems per NFPA 13.
The Model ZN-QR has a 5.6 (80.6) K-factor. The Flush design of the Model ZN-QR features a separable escutcheon
providing 3/8 inch (9.5 mm) vertical adjustment. This adjustment reduces the accuracy to which the xed pipe drops to
the sprinklers must be cut to help assure a perfect t installation.
The Model ZN-QR has been designed with heat sensitivity (Quick Response) and water distribution characteristics proven
to help in the control of res to improve the chance for occupants to escape or be evacuated. However, re sprinkler
systems are not a substitute for intelligent re safety awareness or re safety construction required by building codes.
GENERAL DESCRIPTION
Flush Pendent Sprinkler
Quick Response, Standard Coverage
(PTFE gasketed orice seal design)
Model ZN-QR
K-Factor: 5.6 •SIN: SS2521
WARNINGS
The Model ZN-QR 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,

www.senjusprinkler.com Document No.U029423 • 01-06-2022
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• Approvals: cULus Listed, NYC MEA135-04-E
• Sprinkler Identication Number (SIN): SS2521
• Maximum Working Pressure: 175 psi (12.1 bar)
• Discharge Coefcient (Nominal K-Factor):
{K = 5.6 GPM / psi1/2 (80.6 LPM / bar1/2)
• Temperature Rating:
{162°F (72°C)
{205°F (96°C)
• Vertical Adjustment: 3/8 inch (9.5 mm)
• Finishes:
{Sprinkler and Eschutcheon: White Painted, Black
Painted, Chrome Plated
• Physical Characteristics: Dezincication resistant
Copper Alloy body and PTFE gasketed orice seal design
TECHNICAL DATA
Figure 1: Model ZN-QR, K = 5.6
Flush Pendent Sprinkler
Figure 2: Operation Process
(For illustrative purposes only)
consult the authorities having jurisdiction for guidance and approval.
It is the responsibility of the installing contractor to provide a copy of this document to the owner or their representative,
and in turn, it is the obligation of the owner to provide a copy of this document to a succeeding owner.
The owner is responsible for maintaining their re protection system and devices in proper operating condition. The
installing contractor or sprinkler manufacturer should be contacted relative to any questions.
OPERATION
The Sprinkler assembly contains a small fusible solder
element. When exposed to sufcient heat from a re, the
solder melts and enables the internal components of the
sprinkler to fall away. At this point the sprinkler activates
with the deector dropping into its operated position
(Reference Figure 2), permitting water to ow.
1/2″ NPT
Marking
Temperature Rating
UL Mark
SIN: SS2521
Country Origin
Year of Manufacture
Frame Color Code
Six Wrench Slots
2-7/16″ (Regular Body)
2-1/4″ (Short Body)
⑦
①
③
②
④
⑤
⑥
⑧
1-3/8″ (35mm)
① Body: Copper Alloy
② Frame: Bronze
③ Deflector: Copper Alloy
④ Gasket: PTFE
⑤ Cover: Copper
⑥ Heat Collector: Copper
⑦ Fusible Metal
⑧ Valve Cap: Copper Alloy
Normal Condition Sprinkler Operation Water Discharge

www.senjusprinkler.com Document No.U029423 • 01-06-2022
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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.
DESIGN CRITERIA
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 re 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 specications which are more stringent and which take
precedence over those specied in NFPA 13 or by the authority having jurisdiction.
The spray from the sprinkler is distributed radially outward and downward from the sprinkler deector. 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 dened 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 rmly 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-re conditions or not operating when exposed to an
actual re.
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 ux must be removed from the interior and exterior of the copper piping by thoroughly ushing before
installation of the Sprinkler Heads. Otherwise, residues of ux may cause corrosion and/or leakage in the sprinkler
system.

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Operational Sensitivity Criteria
For proper operational sensitivity, the model ZN-QR must be installed beneath a solid ceiling having a smooth or textured
surface.
Heat Source Criteria
Refer to NFPA 13 for the requirements relating to the prevention of possible activation of the Heat Responsive Element of
Model ZN-QR, due to the exposure of a heat source other than an actual re.
INSTALLATION
The Model ZN-QR must be installed in accordance with the following instructions:
NOTES
Do not use sprinklers which have been subjected to potential mechanical damage. Do not use sprinklers which show deformation
or cracking in either the sprinkler or protection cap.
The Protective Cap must remain on the sprinkler during installation and until the ceiling installation is completed. The Protective
Cap must be removed to place the sprinkler in service.
Use a torque of 7 to 14 ft·lbs (9.5 to 19.0 N·m) to achieve a 1/2 inch NPT sprinkler joint. If you exceed the recommended maximum
torque, this could result in damage to the sprinkler inlet, which may lead to leakage from the sprinkler.
Use only VC-H model wrench socket for installation of ZN-QR sprinklers. Use of any other wrench or socket is prohibited and
may cause damage to the sprinkler.
Do not attempt to compensate for insufcient adjustment in an Escutcheon Plate by under- or over-tightening the sprinkler.
Readjust the position of the sprinkler tting to suit.
Installation Steps
Step 1: The sprinkler must be installed only in the pendent position and with the Sprinkler waterway centerline perpendicular
to the mounting surface.
Step 2: Install the sprinkler tting so that the distance from the face of the tting to the mounting surface will be nominally
1- 5/32 inch as shown in Figure 3.
Step 3: With pipe thread sealant applied to the pipe threads, hand tighten the Sprinkler into the sprinkler tting.
Figure 3: Installation
Make a
Space Here
Min. 1/8″ (3 mm)
Tolerance Limit
of Ceiling Level
2″ Ceiling Hole Diameter
Mounting Surface Mounting Surface
Do Not
Over-Tighten
Center Mark
1-5/32″ for Regular Body
1″ for Short Body

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Step 4: Wrench tighten the Sprinkler using only the Socket
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).
Step 5: Use the “tolerance limit of ceiling level” indicator on the
Protective Cap to check for proper installation height (Ref. Figure 3).
Relocate the sprinkler tting as necessary. If desired the Protective
Cap may also be used to locate the center of the clearance hole by
gently pushing the ceiling material against the center point of the Cap.
Step 6: After the ceiling has been completed with the 2-inch (50mm) diameter clearance hole, use the Cap Removal Tool
(Ref. Figure 5) to remove the Protective Cap and then push on the Escutcheon until its ange just comes in contact with
the ceiling (Ref. Figures 6 & Figure 7).
Figure 4: Ratchet & Socket
Figure 5: Protective Cap Removal Figure 6: Installation
Figure 7: Installation (Correct and Incorrect)
Do not continue to push on the Escutcheon such that it lifts a ceiling panel
out of its normal position. If the Escutcheon cannot be engaged with the
Sprinkler, or the Escutcheon cannot be engaged sufciently to contact the
ceiling, relocate the sprinkler tting as necessary.
Socket VC-H
Ratchet
Protective Cap
Wrenching Area
Protective Cap
Cap Removal Tool
Groove of Cap
Step 1
Step 2
L
o
L
o
Pull down
Mounting Surface
3″ (75 mm) Escutcheon
Correct
Escutcheon Mounting Surface
Mounting Surface
Escutcheon
Incorrect Incorrect
There must
not be space
Escutcheon and Frame
not be engaged
Frame

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CARE & MAINTENANCE
ORDER PROCEDURE
The following instructions must be implemented for the maintenance and service of the Model ZN-QR.
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.
Automatic sprinklers are not to be tested with a heat source. Operation of the heat responsive element can result.
Absence of an Escutcheon Plate may delay the time to sprinkler operation in a re situation.
Before closing a re protection system main control valve for maintenance work on the re protection system, which it controls,
permission to shut down the affected re protection system must be obtained from the proper authorities and all personnel who
may be affected by this action must be notied.
Do NOT enclose sprinklers within drapes, curtains, or valances.
Do NOT hang anything from the sprinklers.
Do NOT cleanse the sprinklers with soap and water, detergents, ammonia, cleaning uids, or other chemicals. Remove dust,
lint, cobwebs, cocoons, insects, and larvae by gently brushing with a feather duster or gently vacuuming with a soft bristle (i.e.,
dusting) brush attachment.
Exercise suitable safety precautions in the use and storage of highly ammable materials. The rapid rate of re development and
spread of which can be caused by such materials can reduce the ability of the sprinkler system to aid in the control of a re in
which they are involved.
Sprinklers, which are found to be leaking or exhibiting visible signs of corrosion, must be replaced.
Automatic Sprinklers must be kept in a cool and dry place. Automatic sprinklers must never be painted, plated, coated, or
otherwise altered after leaving the factory. Modied or over heated sprinklers must be replaced.
Care must be exercised to avoid damage to the sprinklers-before, during, and after installation. Sprinklers damaged by dropping,
striking, wrench twist / slippage, or the like, must be replaced.
When remodeling, such as by adding false beams or light xtures or changing the location of compartment walls, rst verity that
the new construction will not violate the installation requirements stated under WARNINGS. Alter the new construction and/or the
sprinkler system to suit the requirements of this document.
The owner is responsible for the maintenance of the sprinkler system, including inspection and testing, its compliance with
this documents, as well as the standards of the National Fire Protection Association (e.g., NFPA 25), and the regulations of any
other authorities having jurisdiction. The owner should direct any questions regarding the above rules and regulations to the
installing contractors or the sprinkler manufacturer. It is recommended that automatic sprinkler systems be inspected, tested,
and maintained by a qualied Inspection Service in accordance with NFPA 25.
Sprinkler
• Model: ZN-QR
SIN: SS2521, Commercial Flush Pendent Sprinkler, K5.6
• Temperature: 162°F (72°C) or 205°F (96°C)
• Finishes: White Painted, Black Painted, Chrome Plated
Escutcheon
• Escutcheon for ZN-QR Flush Pendent Series, O.D. 3 inch (φ75mm), Order Separately from Sprinkler
• Finishes: White Painted, Black Painted, Chrome Plated
When placing an order, please contact a local distributor with the following information (Model Name, Temperature
and Finish).
Tools & Accessories
• Socket VC-H
For use with a 3/8″drive ratchet (not included)
• Cap Removal Tool for ZN