www.senjusprinkler.com
Document No. U028837 • 01-26-2022
Page 2 of 8
• Approvals:
{
c
UL
us
Listed
• Sprinkler Identification Number (SIN):
SS4421
• Maximum Working Pressure:
175psi (12.1 bar)
• Discharge Coefficient (Nominal K-Factor):
{
K = 4.2 GPM/psi
1/2
(60.5 LPM/bar
1/2
)
• Temperature Rating:
{
162°F (72°C)
{
175°F (79°C)
• Frame Color Code
{
162°F (72°C): Uncolored
{
175°F (79°C): White
• Vertical Adjustment:
3/8 inch (9.5 mm)
• Finishes:
{
Sprinkler and Eschutcheon: White Painted, Black
Painted, Dark Brown Painted, Chrome Plated
• Physical Characteristics:
Dezincification resistant
Copper Alloy body and PTFE gasketed orifice seal design.
Figure 1:
Model ZN-RES K = 4.2
Residential Flush Pendent Sprinkler
Because of the above cited stipulations and the varied nature of residential type architecture, there will be some
compartment designs which cannot be fully sprinklered in accordance with the recommendations of NFPA 13, 13D,
or 13R, In the event of this condition, 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.
T E C H N I C A L DATA
1/2″ NPT
Marking
Temperature Rating
UL Mark
SIN: SS4421
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″
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
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.
