www.senjusprinkler.com
Document No.U029423 • 01-06-2022
Page 4 of 6
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 fire.
I N S TA L L AT I O N
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 insufficient adjustment in an Escutcheon Plate by under- or over-tightening the sprinkler.
Readjust the position of the sprinkler fitting 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 fitting so that the distance from the face of the fitting 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 fitting.
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
