www.senjusprinkler.com
Document No.U029423 • 01-06-2022
Page 2 of 6
• Approvals:
c
UL
us
Listed, NYC MEA135-04-E
• Sprinkler Identification Number (SIN):
SS2521
• Maximum Working Pressure:
175 psi (12.1 bar)
• Discharge Coefficient (Nominal K-Factor):
{
K = 5.6 GPM / psi
1/2
(80.6 LPM / bar
1/2
)
• 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:
Dezincification resistant
Copper Alloy body and PTFE gasketed orifice seal design
T E C H N I C A L 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 fire protection system and devices in proper operating condition. The
installing contractor or sprinkler manufacturer should be contacted relative to any questions.
O P E R AT I O N
The Sprinkler assembly contains a small fusible solder
element. When exposed to sufficient heat from a fire, the
solder melts and enables the internal components of the
sprinkler to fall away. At this point the sprinkler activates
with the deflector dropping into its operated position
(Reference Figure 2), permitting water to flow.
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
